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Publisher: Elsevier   (Total: 3043 journals)

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Showing 1 - 200 of 3043 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 20, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 18, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 83, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 23, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 27, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 4)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 5, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 331, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 25, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 1)
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 211, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 9, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (Followers: 1)
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 23, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 4)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 3)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 4, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 2)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 5, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 4, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 3)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 5)
Additive Manufacturing     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 128, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 9, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 25, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 6, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 16, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 3, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 25, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24, SJR: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 10, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 16, SJR: 0.223, h-index: 22)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 4)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Ecological Research     Full-text available via subscription   (Followers: 41, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 25, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 40, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 47, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 25)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 35, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 3, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 5)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 22)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 4)
Advances in Oncobiology     Full-text available via subscription   (Followers: 3)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 7, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 13)
Advances in Pharmacology     Full-text available via subscription   (Followers: 15, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 7, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 8)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 60)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 2, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 343, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 8)
Advances in Surgery     Full-text available via subscription   (Followers: 7, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 30, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 15)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 43, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 5, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 307, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 5, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 8, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 405, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 30, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 38, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 1)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 53, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 5, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 9, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 6)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access  
Algal Research     Partially Free   (Followers: 8, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 4, SJR: 0.776, h-index: 35)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 7, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 48, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 5)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 3)
American Heart J.     Hybrid Journal   (Followers: 48, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 45, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 38, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 6, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 16, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 31, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 24, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 33, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 46, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 191, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 54, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 3)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 23, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 26, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 21, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 34, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 5)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 55, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 10)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 2, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 162, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 8, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 1)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 22, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 157, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)
Animal Reproduction Science     Hybrid Journal   (Followers: 5, SJR: 0.711, h-index: 78)
Annales d'Endocrinologie     Full-text available via subscription   (Followers: 1, SJR: 0.394, h-index: 30)
Annales d'Urologie     Full-text available via subscription  
Annales de Cardiologie et d'Angéiologie     Full-text available via subscription   (SJR: 0.177, h-index: 13)
Annales de Chirurgie de la Main et du Membre Supérieur     Full-text available via subscription  
Annales de Chirurgie Plastique Esthétique     Full-text available via subscription   (Followers: 2, SJR: 0.354, h-index: 22)
Annales de Chirurgie Vasculaire     Full-text available via subscription   (Followers: 1)

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Journal Cover AEU - International Journal of Electronics and Communications
  [SJR: 0.318]   [H-I: 36]   [8 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1434-8411
   Published by Elsevier Homepage  [3043 journals]
  • Analog realization of fractional filters: Laguerre approximation approach
    • Authors: Jerzy Baranowski; Mariusz Pauluk; Andrzej Tutaj
      Pages: 1 - 11
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Jerzy Baranowski, Mariusz Pauluk, Andrzej Tutaj
      Fractional filters are attractive tools for signal processing allowing greater flexibility in shaping the frequency response. Unfortunately they are very difficult to realize directly, as for digital approach they require infinite memory and for analog approach they require fully fractional capacitors or inductors. That is why approximation approaches are so attractive. In this paper we present a method of implementing an analog approximation of fractional filter. Our approach is based on Laguerre Impulse Response Approximation method. We present its modification allowing reduction of the required connections and without problems with signal-to-noise ratios. Our results are illustrated both with simulations and with experiments.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.011
      Issue No: Vol. 81 (2017)
       
  • Fractional-order impedance transformation based on three port mutators
    • Authors: Ahmed Soltan; Ahmed M. Soliman; Ahmed G. Radwan
      Pages: 12 - 22
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Ahmed Soltan, Ahmed M. Soliman, Ahmed G. Radwan
      Due to the importance of the mutators for active circuit realizations, this paper investigates different three port mutator circuits that can be used to implement a floating impedance. The analytical equations that govern the proposed circuits as well as the necessary conditions under different configurations are introduced to realize positive and negative impedances. The proposed circuits are based on second generation current conveyors (CCII) and/or transconductance Amplifier (TA). Moreover, the fractional-order impedance transformation using these mutators are investigated showing the advantages of fractional-order parameters for extra design degrees of freedom. Circuit simulations using Advanced Design System (ADS) for the proposed circuits are made by using 0.25 CMOS technology from MOSIS to implement the active blocks. Also, practical models for the resistances and capacitances are included in the simulation to include the practical effects on the circuit performance. As an application, the proposed circuits are used to implement fractional order filters and oscillators to validate their reliability and the analytical discussion.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.012
      Issue No: Vol. 81 (2017)
       
  • Dimension reduction using kernel collaborative representation based
           projection
    • Authors: Jun Yin; Zhihui Lai; Hui Yan
      Pages: 23 - 30
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Jun Yin, Zhihui Lai, Hui Yan
      Dimension reduction plays a key role in pattern recognition. Sparsity preserving projection (SPP) and collaborative representation based projection (CRP) are two up-to-date dimension reduction methods. SPP uses sparse representation for dimension reduction and CRP uses collaborative representation. SPP and CRP both have good performances in dimension reduction and CRP is computationally more efficient than SPP. To make CRP more effective for linear inseparable data, we propose kernel collaborative representation based projection (KCRP) in this paper. In KCRP, the original data is mapped into a higher dimensional space by a nonlinear mapping and collaborative representation is performed in this new space by using kernel trick. Then, the low dimensional features are obtained by preserving the collaborative reconstructive relation. Experiments on AR, ORL and FERET databases show that KCRP performs better than SPP, CRP and some other popular dimension reduction methods.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.032
      Issue No: Vol. 81 (2017)
       
  • A compact planar ultra-wideband bandpass filter with multiple resonant and
           defected ground structure
    • Authors: Jagadish Baburao Jadhav; Pramod Jagan Deore
      Pages: 31 - 36
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Jagadish Baburao Jadhav, Pramod Jagan Deore
      A compact bandpass filter with dumbbell shape Defected Ground Structure (DGS) operating on ultra wide pass band (UWB – 3.1 to 10.6GHz) is proposed. It is based on hybrid microstrip coplanar waveguide (dual sided metal) structure. A Multiple Resonant Structure (MRS) is constructed using coplanar waveguide (CPW) planar transmission line. The MRS makes the resonance using quarter wavelength and half wavelength open-ended CPW. The equispaced three resonances at lower (3.1GHz), center (6.85GHz) and higher edge (10.6GHz) of the whole Ultra Wide Band is achieved using CPW MRS. To make the band as flat as possible, two more resonances are introduced using quarter wavelength microstrip patches on top of the commonly shared substrate, so the proposed filter becomes a five pole bandpass filter. A dumbbell shaped defected ground structure on either side of CPW MRS improves the return loss almost less than 20dB over the whole UWB passband. The simulated results of proposed filter show good transmission response within passband and good rejection in out of the band. The simulated and measured results are very close to each other which proves the efficacy of proposed design.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.07.003
      Issue No: Vol. 81 (2017)
       
  • Current mode first order universal filter and multiphase sinusoidal
           oscillator
    • Authors: Ashok Kumar; Sajal K. Paul
      Pages: 37 - 49
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Ashok Kumar, Sajal K. Paul
      In this article a new current mode first order universal filter with single input and multiple outputs is proposed. The realization uses single dual-X multiple output second generation current conveyor (DX-MOCCII) and two passive grounded components. The presented circuit provides high-pass, low-pass and non-inverting and inverting all-pass responses simultaneously, all at different high impedance outputs. The realized circuit does not require any component matching constraint and all the sensitivities are found low. As an application the non-inverting all-pass filter is cascaded in a close loop with the current mode non-inverting integrator to design a current mode multiphase sinusoidal oscillator (MSO) having six phases. Voltage mode six phase sinusoidal oscillator is also achieved by resistively loading the current mode outputs. The analysis such as phase noise, non-ideality, stability and Monte Carlo are presented and discussed. The presented theory and its results are validated using 0.25µm process parameters of TSMC in PSPICE simulator.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.07.004
      Issue No: Vol. 81 (2017)
       
  • A covariance matrix shrinkage method with Toeplitz rectified target for
           DOA estimation under the uniform linear array
    • Authors: Yanyan Liu; Xiaoying Sun; Shishun Zhao
      Pages: 50 - 55
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Yanyan Liu, Xiaoying Sun, Shishun Zhao
      A covariance matrix shrinkage method is proposed to make an improvement of the direction of arrival (DOA) estimation under a uniform linear array in a scenario where the number of sensors is large and the sample size is relatively small. The main contribution is that we provide a shrinkage target with Toeplitz structure and deduce a closed-form estimation of the shrinkage coefficient. The closed-form and the expectation of the shrinkage coefficient estimate are calculated based on the unbiased and consistent estimates of the trace and moments of a Wishart distributed covariance matrix. The statistical property of the shrinkage coefficient estimate is discussed through theoretical analysis and simulations, which demonstrate the shrinkage coefficient estimate can ensure that the proposed covariance matrix estimate is a good compromise between the sample covariance matrix (SCM) and the target. The root-mean-square-error (RMSE) simulations of DOA estimation show that the proposed method can improve the multiple signal classification (MUSIC) DOA estimation performance in the case of low signal-to-noise ratio (SNR) with small sample size, and also can provide a satisfactory performance at high SNR.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.026
      Issue No: Vol. 81 (2017)
       
  • On practical construction of electronically controllable compact current
           amplifier based on commercially available elements and its application
    • Authors: Roman Sotner; Norbert Herencsar; Jan Jerabek; Lukas Langhammer; Josef Polak
      Pages: 56 - 66
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Roman Sotner, Norbert Herencsar, Jan Jerabek, Lukas Langhammer, Josef Polak
      This paper presents a new concept of a current amplifier (CA) with electronically adjustable features (input resistance and current gain) implemented using commercially available devices. Several variations of basic structure are studied, described and the selected solutions verified by PSpice simulations and, moreover, also by lab experiments. Saving one discrete active device in comparison to already known similar topologies of single-input and single-output version (CA-SISO) is significant benefit whereas all other qualitative features remain very similar to previously reported ones. Simple modification of CA concept to multiple-output version (CA-SIMO), having independent adjustable current gain in each of output branches, is easily available. Experimental tests of features of discussed concepts yield adjustability range of input resistance from 100Ω to more than 10kΩ and current gain adjusting from 0.1 to 3.5 with bandwidth (−3dB) of CA transfer response up to 16MHz. As an example of application, proposed CA was successfully implemented in quadrature oscillator with a very wide tunability range from 29kHz to 4.94MHz. It was achieved by electronic control of several adjustable parameters of proposed CA.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.07.002
      Issue No: Vol. 81 (2017)
       
  • Improving energy efficiency using a link adaptation algorithm dedicated
           for 100Gbps wireless communication
    • Authors: Lukasz Lopacinski; Marcin Brzozowski; Rolf Kraemer; Steffen Büchner; Jörg Nolte
      Pages: 67 - 73
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Lukasz Lopacinski, Marcin Brzozowski, Rolf Kraemer, Steffen Büchner, Jörg Nolte
      This paper presents a link adaptation algorithm dedicated for 100Gbps wireless transmission. Interleaved Reed-Solomon codes are selected as forward error correction (FEC) algorithms. The redundancy of the codes is selected according to the channel bit error rate (BER). The uncomplicated FEC scheme allows implementing a complete data link layer processor in an FPGA (field programmable gate array). In our case, we use the Virtex7 FPGA to validate the functionality of our implementation. The proposed FPGA-processor achieves 169Gbps throughput. Moreover, the implementation is synthesized into 40nm CMOS technology and the described link adaptation algorithm allows reducing consumed energy per bit to values below 1pJ/bit at BER <1e−4. With higher BER, the energy increases up to ∼13pJ/bit.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.07.005
      Issue No: Vol. 81 (2017)
       
  • Current conveyor-based differential capacitance analog interface for
           displacement sensing application
    • Authors: Giuseppe Ferri; Francesca Romana Parente; Vincenzo Stornelli
      Pages: 83 - 91
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Giuseppe Ferri, Francesca Romana Parente, Vincenzo Stornelli
      A current conveyor-based analog electronic interface for differential capacitive sensors is here shown. The read-out circuit that utilizes second generation Current Conveyors (CCIIs) as active blocks is able to evaluate differential capacitive variations performing a capacitance-to-voltage conversion. This solution has been implemented both in a discrete element board and as integrated version in a standard 350 nm CMOS technology. Simulations and experimental resultshave shown a linear input/output characteristic and a good agreement with theoretical expectations, being the former performed for both the designed solutions, whereas the latter only for a discrete prototype board (employing a low cost commercial component (AD844). Sensitivity and resolution data on a practical case-study of a displacement sensor are constant and their values are satisfactory. Both simulated and measured results make the proposed architecture a good candidate as first stage of analog front-ends to be employed in differential capacitive instrumentation.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.07.014
      Issue No: Vol. 81 (2017)
       
  • Dual band monopole antenna based on metamaterial structure with narrowband
           and UWB resonances with reconfigurable quality
    • Authors: Samaneh Heydari; Kioumars Pedram; Zeeshan Ahmed; Ferdows B. Zarrabi
      Pages: 92 - 98
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Samaneh Heydari, Kioumars Pedram, Zeeshan Ahmed, Ferdows B. Zarrabi
      In this article, an Ultra Wide Band (UWB) monopole antenna based on Metamaterial (MTM) unit cell with reconfigurable feature has been developed. The proposed antenna covers 3.1–10.6GHz for UWB applications and it has a reconfigurable narrow-band for L-band (1.27GHz) and wireless applications. The gaps in Split Rings Resonator (SRR) element are made for the Left-hand capacitance and Ω-shape strip layer by four via junctions are used for Left-hand inductance. The antenna is printed on FR-4 low cost substrate with relative permittivity of 4.4 and thickness of 1.6mm. The total size of the antenna is 40mm×40mm. The simulation is carried out using HFSS commercial full-wave software. In addition, the experimental results are presented and compared with simulated results. The antenna gives a maximum peak gain of 6dBi with Omni-Directional radiation pattern and high efficiency of more than 70%. By embedding four switches in Ω-shape strip layer, a reconfigurable antenna has been successfully designed for wireless applications with sufficient qualification. The monopole part covers the UWB spectrum and the CRLH is responsible for the controllable narrowband resonance. The simulation and experimental results are confirmed by the numerical results.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.07.015
      Issue No: Vol. 81 (2017)
       
  • Memristor emulator with tunable characteristic and its experimental
           results
    • Authors: Yunus Babacan; Abdullah Yesil; Firat Kacar
      Pages: 99 - 104
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Yunus Babacan, Abdullah Yesil, Firat Kacar
      In this study, operational transconductance amplifier (OTA) based simple and practical TiO2 memristor emulator is presented. The proposed memristor emulator employs a multi-outputs OTA, an analog multiplier and a resistor and a capacitor. The parameters of the proposed memristor emulator can be tuned electronically by changing the biasing current of the OTA. Change of the transconductance gain of the OTA provides an advantage: “externally controllable memristor”. Non-volatile resistive switching characteristics and an application of this proposed memristor are given. Also, the memristor emulator is implemented using the commonly available OPA860. The effectiveness of the proposed memristor emulator is verified by the experimental results, which show good agreement with the theoretical and simulation results.

      PubDate: 2017-07-27T20:29:39Z
      DOI: 10.1016/j.aeue.2017.07.012
      Issue No: Vol. 81 (2017)
       
  • Evaluation of gain enhancement in improved size microstrip antenna arrays
           for millimetre-wave applications
    • Authors: Muhammad Saqib Rabbani; Hooshang Ghafouri-Shiraz
      Pages: 105 - 113
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Muhammad Saqib Rabbani, Hooshang Ghafouri-Shiraz
      A number of microstrip antenna arrays have been designed based on the improved size patch elements with different substrate heights to evaluate the gain enhancement in practical measurements. Initially, microstrip patch antenna arrays (MPAAs) have been designed, analysed and tested at 10GHz frequency and then the optimised high gain (∼21dBi) array is fabricated and tested at 60GHz-band frequencies. It has been found that the loss emergence due to the long feeding transmission line (TL) network severely degrades the antenna gain in large MPAAs on the thicker substrates. However, the gain can be significantly enhanced in large MPAAs by employing relatively thinner substrate but it shrinks the return loss (S11) bandwidth (BW) and increases the side lob level (SLL).

      PubDate: 2017-07-27T20:29:39Z
      DOI: 10.1016/j.aeue.2017.07.017
      Issue No: Vol. 81 (2017)
       
  • Sampling theorems for bandlimited random signals in the offset linear
           canonical transform domain
    • Authors: Shuiqing Xu; Feng Li; Yi Chai; Youqiang Hu; Lei Huang
      Pages: 114 - 119
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Shuiqing Xu, Feng Li, Yi Chai, Youqiang Hu, Lei Huang
      Sampling theorems for deterministic signals in the offset linear canonical transform (OLCT) domain have been widely proposed in the literature. In this paper, we consider the sampling and reconstruction schemes for random signals in the OLCT domain. We first define the power spectral density and correlation function for random signals in the OLCT domain. By utilizing the definitions, the power spectral density relations for the OLCT filter are derived. Subsequently, the multichannel sampling theorem for bandlimited random signals in the OLCT domain is derived. In addition, some sampling theorems for bandlimited random signals associated with the OLCT are also presented by designing different OLCT filters. Finally, the simulation results are presented to show the advantage and effectiveness of the theorems.

      PubDate: 2017-07-27T20:29:39Z
      DOI: 10.1016/j.aeue.2017.07.001
      Issue No: Vol. 81 (2017)
       
  • Rebuttal to ‘Fully-uncoupled independent control of frequency and
           condition of oscillation: A caution’
    • Authors: Raj Senani; Data Ram Bhaskar; Shanti Swaroop Gupta; Bhopendra Singh
      Pages: 120 - 131
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Raj Senani, Data Ram Bhaskar, Shanti Swaroop Gupta, Bhopendra Singh
      Based upon the experimental results of the two CFOA-based fully-uncoupled sinusoidal oscillators proposed earlier by Bhaskar-Gupta-Senani-Singh, recently Abuelma’atti and Khalifa issued a caution that the classification of this class of oscillators providing independent control of condition of oscillation (CO) and frequency of oscillation (FO) through separate elements, as fully-uncoupled, does not appear to be correct. In this communication, we present the results of a recheck of the experimental data of Abuelma’atti and Khalifa and show that their experimental results are not repeatable and in most of the cases, the oscillations do not even exist and hence, the measurement data as given by them is misleading. Furthermore, it is shown that the measured oscillation frequencies, as shown by Abuelma’atti and Khalifa in four tables, do not tally with those calculated from their own formula as well as the experimental results taken by us. This communication thus, refutes the claims made in the quoted paper of Abuelma’atti and Khalifa published in this journal earlier.

      PubDate: 2017-07-27T20:29:39Z
      DOI: 10.1016/j.aeue.2017.07.010
      Issue No: Vol. 81 (2017)
       
  • Special issue on recent advances in the design and applications of
           fractional-order circuits and systems
    • Authors: Costas Psychalinos; Ahmed S Elwakil; Anis Allagui; Aleksei Tepljakov
      Pages: 132 - 135
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Costas Psychalinos, Ahmed S Elwakil, Anis Allagui, Aleksei Tepljakov


      PubDate: 2017-07-27T20:29:39Z
      DOI: 10.1016/j.aeue.2017.07.016
      Issue No: Vol. 81 (2017)
       
  • On the study of cognitive two-way relaying using a denoise-and-forward
           relay
    • Authors: Ruifeng Gao; Xiaodong Ji; Zhihua Bao
      Pages: 150 - 157
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Ruifeng Gao, Xiaodong Ji, Zhihua Bao
      In this paper, we consider a cognitive cooperative wireless system consisting of two primary users, a cognitive base station (CBS) and a secondary user. A cognitive two-way relaying (CTWR) scheme is proposed, where the secondary user tries to assist the primary users to meet their target quality of service (QoS) by acting as a cognitive two-way relay, when the direct link of the two primary users cannot meet the target QoS. As a return, the primary network shares its transmission time-slot with the secondary user. First, the system outage probabilities of traditional direct transmission and CTWR scheme are analyzed, giving both the exact and approximated expressions. Second, a transmission time-slot splitting algorithm between the primary and secondary users is proposed. Third, the ergodic capacity of the secondary user under the CTWR scheme is examined. Finally, simulation results show that the proposed scheme cannot only help the primary users to meet their target QoS, but also improve the communication opportunities of the secondary user.

      PubDate: 2017-07-27T20:29:39Z
      DOI: 10.1016/j.aeue.2017.07.006
      Issue No: Vol. 81 (2017)
       
  • Optimum Distance and Power allocation Strategies for Quantum-limited
           Inter-Relayed FSO Communication System
    • Authors: Himanshu Khanna; Mona Aggarwal; Swaran Ahuja
      Pages: 10 - 18
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Himanshu Khanna, Mona Aggarwal, Swaran Ahuja
      In this work, we analyze the performance of a uni-directional quantum-limited inter-relay assisted free space optical link. We assume that there is no direct line of sight path between source and destination. The influence of path loss, atmospheric turbulence and pointing error impairments is considered for the analysis. The turbulence induced fading is modeled by independent but not necessarily identically distributed Gamma-Gamma fading statistics. The proposed system employs decode and forward relaying protocol assisted with channel state information. The approximate analytical expression for the probability of error is derived and illustrated by numerical plots. The asymptotic analysis for minimizing error probability in order to find optimum distance between the nodes for uniform power transmission, and for optimizing power allocated to different links, has been performed. It is shown that either distance between the nodes can be optimized for minimizing error probability when uniform power allocation is done, or optimum power allocation can be done for minimizing probability of error. Further, it helps to increase the distance for transmission between source and destination, and can make transmission possible in situations where direct link between source and destination can’t be established due to high rise buildings and other obstacles, while keeping the total transmitted power within permissible levels.

      PubDate: 2017-06-27T09:44:02Z
      DOI: 10.1016/j.aeue.2017.06.015
      Issue No: Vol. 80 (2017)
       
  • Performance analysis of MC-CDMA cellular systems employing MMSE multiuser
           detector in presence of own-cell and co-cell interference
    • Authors: Henry Carvajal Mora; Nathaly Orozco Garzón; Celso de Almeida
      Pages: 19 - 28
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Henry Carvajal Mora, Nathaly Orozco Garzón, Celso de Almeida
      In this work, it is analyzed the uplink performance of MC-CDMA cellular systems in order to show that a MMSE multiuser detector can mitigate not only the own-cell interference, but also the co-cell interference. For the analysis, it is also considered a linear antenna array at the base station. The channel includes additive white Gaussian noise, exponential path-loss and slow frequency-selective Rayleigh fading. First, the interference in the cellular system is analyzed. Then, approximate expressions to evaluate the signal-to-interference ratio (SIR) are derived. Also, expressions to evaluate the bit error rate (BER) both for BPSK and M-QAM modulations are obtained. Monte Carlo simulations verify the tightness of the expressions. The results show that when we include the co-cell interference statistics in the MMSE detector design, the effects of this interference can be mitigated. Also, it is observed that the system can be overloaded when the number of antennas in the array is increased while the mean BER maintains reasonable values. Finally, with an asymptotic analysis of the BER expressions, the BER reduction with the MMSE multiuser detector when compared with the zero-forcing multiuser detector is obtained. This BER reduction has not been previously obtained in the literature.

      PubDate: 2017-06-27T09:44:02Z
      DOI: 10.1016/j.aeue.2017.06.020
      Issue No: Vol. 80 (2017)
       
  • Adaptive Bregmanized total variation model for mixed noise removal
    • Authors: Gen Li; Xiang Huang; Shuang-Gao Li
      Pages: 29 - 35
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Gen Li, Xiang Huang, Shuang-Gao Li
      To solve the problem of the staircase effect and removing mixed noise, including Gaussian and salt and pepper noise, which can occur during image formation and transmission, a total variation-based denoising model using an edge detection function is proposed. Moreover, an improved split Bregman iteration method is used to solve the nonlinear problem. The results of comparative experiments demonstrate that the proposed model removes Gaussian and salt and pepper noise while maintaining detailed features.

      PubDate: 2017-06-27T09:44:02Z
      DOI: 10.1016/j.aeue.2017.06.023
      Issue No: Vol. 80 (2017)
       
  • Clipping noise estimation in OFDM systems: A greedy-based approach
    • Authors: Mohammad Javad Azizipour; Kamal Mohamed-pour
      Pages: 36 - 42
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Mohammad Javad Azizipour, Kamal Mohamed-pour
      A major drawback of orthogonal frequency division multiplexing (OFDM) is the high peak-to-average power ratio (PAPR) which drives transmitter’s power amplifier into saturation. One of the simplest methods for mitigating PAPR is to clip signal prior to the amplifier. However, this technique suffers from noise caused by clipping operation and limits its practical application. To investigate this issue, we have proposed a greedy algorithm based on orthogonal matching pursuit (OMP) utilizing a distance metric and a threshold parameter in order to define a backward condition to achieve better results in clipping noise estimation. The defined distance metric and threshold parameter are jointly used to determine whether the recovered noise indices are valid or not. Besides, a closed form equation for threshold parameter has been obtained in terms of channel statistics and has been validated by extensive numerical simulations. According to such appropriate choice of threshold values, simulations demonstrate that the proposed algorithm outperforms state-of-the-art methods such as OMP, ℓ 1 -minimization and classic methods, especially when SNR grows higher. Also, in terms of computational complexity, proposed algorithm due to its structure imposes a slightly further complexity to the receiver in comparison with conventional OMP algorithm.

      PubDate: 2017-06-27T09:44:02Z
      DOI: 10.1016/j.aeue.2017.06.021
      Issue No: Vol. 80 (2017)
       
  • Dual-mode OTA based biquadratic filter suitable for current-mode
           applications
    • Authors: Ugur Cini; Mustafa Aktan
      Pages: 43 - 47
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Ugur Cini, Mustafa Aktan
      In this paper, a dual mode single-input multiple-output (SIMO) biquadratic filter structure is presented using multi-output Operational Transconductance Amplifiers (OTAs). Using a simple switch, the filter operates alternatively in trans-admittance mode or current mode. Selection of working mode using a switch provides flexibility for current-mode design. The filter natural angular frequency (ω0) and quality factor (Q) can be orthogonally adjusted both in current mode and trans-admittance mode operation. The proposed structure has simple structure, requiring only four OTAs and two grounded capacitors. The proposed structure is the only SIMO structure where the working mode is selected using a switch. The proposed biquadratic structure is realized using 0.35µm CMOS technology, and, circuit functionality is verified by SPICE simulations.

      PubDate: 2017-06-27T09:44:02Z
      DOI: 10.1016/j.aeue.2017.06.024
      Issue No: Vol. 80 (2017)
       
  • Via-less CRLH-TL unit cells loaded compact and bandwidth-enhanced
           metamaterial based antennas
    • Authors: Venkata Rajasekhar Nuthakki; Sriramkumar Dhamodharan
      Pages: 48 - 58
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Venkata Rajasekhar Nuthakki, Sriramkumar Dhamodharan
      The via-less composite right hand left hand (CRLH)-TL unit cells loaded compact and bandwidth-enhanced metamaterial (MTM) antennas have been designed and experimentally investigated. Four novel unit cells are designed and its dispersion characteristics of the proposed unit cells are numerically calculated which follows CRLH-TL properties. Further, the conventional metallic vias of CRLH-TL have been eliminated to increase the fabrication flexibility. The four CRLH-TL unit cells are loaded into monopole antennas which result, four via-less open-ended MTM antennas respectively. Its ZOR (zeroth order resonance) bandwidth is increased by realizing small shunt capacitance and large shunt inductance. Further, to increase overall antenna bandwidth, merging of ZOR mode to the higher and lower order modes into a single pass band has been done by realizing proper CRLH-TL unit cells. The each proposed antenna has a dimension of 0.13λ0 ×0.08λ0 ×0.0085λ0, where the free space wavelength λ0 at 1.6GHz. The four proposed antennas have S11 <−10dB fractional bandwidths (FBW) 173% (1–13.6GHz), 169% (1.2–14.5GHz), 158% (1.6–13.5GHz) and 158% (1.6–13.5GHz) respectively. The optimum gain and desired radiation characteristics have been obtained for all proposed antennas, which can be suitable for UWB applications. The CST-MWS has been used for the parametric study of the proposed antennas. A good agreement has been observed between simulated and experimental results.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.033
      Issue No: Vol. 80 (2017)
       
  • A novel antenna allocation technique for green single cell MIMO and
           MIMO-CoMP downlink transmission
    • Authors: Tohid Tamadoni; Mohsen Eslami; Shahrokh Jam; Danial Davarpanah
      Pages: 59 - 66
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Tohid Tamadoni, Mohsen Eslami, Shahrokh Jam, Danial Davarpanah
      To meet the increasing traffic and energy consumption demands of wireless networks, energy efficiency and energy efficient transmission techniques have become an urgent need for cellular networks. In this work, the problem of base station (BS) power consumption reduction for increased network energy efficiency of downlink TDMA-based transmission is considered. To meet network’s high traffic demand due to high data rates required by large numbers of users, multiple-input multiple-output (MIMO) and coordinated multi-point (CoMP) transmission have been considered. By adopting realistic power consumption models for single cell MIMO and multi-cell MIMO-CoMP networks, enhanced antenna allocation techniques are proposed and their energy efficiency is compared to the conventional power allocation schemes. It is shown that for a target signal to interference plus noise ratio (SINR), the proposed techniques consume less total power compared to traditional schemes, which leads to higher energy efficiency. In addition, for same power level, the symbol error rate (SER) is reduced and system’s sum rate increases, which leads to higher spectral efficiency.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.013
      Issue No: Vol. 80 (2017)
       
  • Design and analysis of electrostatic doped Schottky barrier CNTFET based
           low power SRAM
    • Authors: Amandeep Singh; Mamta Khosla; Balwinder Raj
      Pages: 67 - 72
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Amandeep Singh, Mamta Khosla, Balwinder Raj
      In recent years, much emphasis is given for low power memory design by reducing leakage power. Carbon nanotube field effect transistor (CNTFET) based static random access memory (SRAM) provides better stability along with low static power consumption due to variable bandgap and threshold voltage as function of diameter. Electrostatic doped Schottky barrier carbon nanotube field effect transistor (ED-SBCNTFET) accounts for much low leakage current and hence can be used for low power SRAM design. This paper proposes a novel design of ED-SBCNTFET based low power SRAM which consists of additional polarity gates. 6-T SRAM cell is designed and simulated in HSPICE for both conventional CNTFET and ED-SBCNTFET. SRAM performance is analyzed on the basis of various figures of merit i.e. stability and power dissipation. ED-SBCNTFET SRAM shows advantage of low power over conventional CNTFET SRAM without loss of stability. Furthermore, SRAM is designed for smaller diameter which gives ultra low power cell with minute change in stability. Lastly dual chirality scheme is implemented and analyzed for ED-SBCNTFET 6-T SRAM cell.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.030
      Issue No: Vol. 80 (2017)
       
  • A dual polarized antenna on a novel broadband multilayer Artificial
           Magnetic Conductor backed surface for LTE/CDMA/GSM base station
           applications
    • Authors: Senthilkumar Rajagopal; Gokulnath Chennakesavan; Deepak Ram Prasath Subburaj; Raju Srinivasan; Abhaikumar Varadhan
      Pages: 73 - 79
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Senthilkumar Rajagopal, Gokulnath Chennakesavan, Deepak Ram Prasath Subburaj, Raju Srinivasan, Abhaikumar Varadhan
      The paper presents a low profile dual polarized dipole antenna topology backed by a novel broadband multilayer Artificial Magnetic Conductor (AMC) based reflecting surface. The antenna consists of a pair of square loop shaped dipoles with T-shaped feed structures arranged orthogonally to provide dual slant polarizations at ±45°. The antenna structure is backed by a novel multilayered AMC structure consisting of stacked square patches with via connected at middle and an air filled ground plane at the bottom. Experimental results show that the proposed antenna operates from 700 to 1000MHz with bandwidth of 35% and an average gain of 8.5dBi over the bandwidth. The Simulated and measured results of the antenna structure indicate the antenna to be suitable for interoperable Long Term Evolution (LTE), Code Division Multiple Access (CDMA) and Global System for mobile communications (GSM) applications.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.028
      Issue No: Vol. 80 (2017)
       
  • Performance analysis of adaptive space-time coded systems with continuous
           phase modulation
    • Authors: Guowei Lei; Yuanan Liu; Xuefang Xiao
      Pages: 80 - 85
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Guowei Lei, Yuanan Liu, Xuefang Xiao
      In modern wireless communications, it is getting urgent to make a better trade-off between reliability and effectiveness in wireless systems. In fact, the use of coded cooperation (e.g. space time coding) in multiple input and multiple output (MIMO) system has drawn much attention for this purpose. However, it needs to be further investigated how to select the space time codes (STC) adaptively. On the other hand, continuous phase modulation (CPM) is a promising technology for its merits of power and spectrum efficiency. This study is to consider adaptive space time coded CPM systems. The criterion of adaptive switching is based on the Frobenius norm and the thresholds between STC schemes. Analysis and simulation are made to the proposed system in terms of frame error rate and data rate.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.034
      Issue No: Vol. 80 (2017)
       
  • Current mode filters with reduced complexity using a single EX-CCCII
    • Authors: D. Agrawal; S. Maheshwari
      Pages: 86 - 93
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): D. Agrawal, S. Maheshwari
      In this paper an active element Extra-X current controlled conveyor (EX-CCCII) is used to reduce the complexity of some existing circuits. Two second-order current-mode biquadratic filter circuits are proposed, each using a single active element and two grounded capacitors. The first circuit is three input single output (TISO) and the second one is single input three outputs (SITO) biquadratic filter. The First circuit can realize all the standard filter transfer functions, while the second circuit can realize LP, BP and HP responses. The study of non-idealities and parasitics of the active element and their effects on transfer functions is carried out. The new circuits are found to be simpler than the earlier ones in terms of number of transistors. The functionality of the proposed biquadratic filters is verified through detailed PSPICE simulations using 0.25µm TSMC CMOS technology parameters.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.025
      Issue No: Vol. 80 (2017)
       
  • Current-mode capacitorless integrators and differentiators for
           implementing emulators of fractional-order elements
    • Authors: Panagiotis Bertsias; Costas Psychalinos; Ahmed Elwakil; Brent Maundy
      Pages: 94 - 103
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Panagiotis Bertsias, Costas Psychalinos, Ahmed Elwakil, Brent Maundy
      Fractional-order capacitor and inductor emulator, implemented using current-mirrors as active elements and MOS transistors as capacitors, is introduced in this paper. Current-mirror integrators are used for performing the required current-mode integration/differentiation operation within the emulator stage. Also, a voltage-to-current converter, implemented using an Operational Transconductance Amplifier, is utilized for realizing the required interface of the input signal. Thus, the proposed emulator is simultaneously capacitorless and resistorless and offers the advantage of electronic tuning of the characteristics as well as of the type of the emulated fractional-order element. In addition, a modified version of the emulator that allows current excitation is proposed. The evaluation of the behavior of the proposed schemes has been performed using the Cadence IC design suite and the Design Kit provided by the Austrian Micro Systems 0.35μm CMOS process.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.036
      Issue No: Vol. 80 (2017)
       
  • A compact integrated Bluetooth UWB dual-band notch antenna for automotive
           communications
    • Authors: Bing Yang; Shaocheng Qu
      Pages: 104 - 113
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Bing Yang, Shaocheng Qu
      This article presents a compact integrated Bluetooth UWB antenna with lower and upper WLAN dual-band notch characteristics for automotive communications. The proposed antenna consists of a quasi U-shape patch, four stubs and the ground plane with a stepped slot. The designed antenna operates over 2.39–2.49GHz and 3.1–11.4GHz bands with S 11 < - 10 dB corresponding to Bluetooth and UWB, and has two rejected bands of 4.97–5.48GHz (lower WLAN) and 5.69–5.99GHz (upper WLAN). Besides, housing effects of the proposed antenna are investigated in presence of approximate in-vehicular environment and simulated results show that the stable performance is suitable for automotive communications. Finally, a simple two-port MIMO antenna is designed and its performance is appropriate for MIMO/diversity application.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.031
      Issue No: Vol. 80 (2017)
       
  • Generalized fractional logistic map encryption system based on FPGA
    • Authors: Samar M. Ismail; Lobna A. Said; Ahmed A. Rezk; Ahmed G. Radwan; Ahmed H. Madian; Mohamed F. Abu-Elyazeed; Ahmed M. Soliman
      Pages: 114 - 126
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Samar M. Ismail, Lobna A. Said, Ahmed A. Rezk, Ahmed G. Radwan, Ahmed H. Madian, Mohamed F. Abu-Elyazeed, Ahmed M. Soliman
      This paper introduces the design of a generalized fractional order logistic map suitable for pseudorandom number key generators and its application in an encryption system based on FPGA. The map is generalized through two parameters ( a , b ) where complete analysis of their effect on the map is detailed, which gives more control on the map chaotic regions. The vertical map and the zooming map presented in this paper are two special maps extracted from the generalized map with their detailed analysis. Not only the positive bifurcation, but also the negative side is discussed through this paper, covering the complete diagram. The specifications of the introduced special logistic maps are proved to be completely controlled through eight design problems with their Lyapunov exponent. As an application, these eight designs are used for the key generation to encrypt different images through a simple algorithm. The correlation coefficients (horizontal, vertical, and diagonal) of the encryption system proposed, as well as the response to differential attacks are calculated. The sensitivity analysis proves that the encryption algorithm develops high sensitivity to the fractional-order key, which appears from the wrong decryption with 0.001% change of any system parameter. The encryption system is implemented on a Virtex-5 FPGA, XC5VLX50T, with a maximum clock frequency equal to 58.358MHz.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.05.047
      Issue No: Vol. 80 (2017)
       
  • Decision fusion in mobile wireless sensor networks using cooperative
           multiple symbol differential space time coding
    • Authors: Mohammad A. Al-Jarrah; Rami Al-Jarrah; Nedal Al-Ababneh
      Pages: 127 - 136
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Mohammad A. Al-Jarrah, Rami Al-Jarrah, Nedal Al-Ababneh
      In this article, we propose a cooperative scheme for differential space-time codes (DSTCs) to be applied for mobile wireless sensor networks (WSNs) in order to mitigate multipath fading effect. We assume that sensors make independent local decisions about the existing hypothesis and report their decisions to a fusion center, where the final decision is made. Sensors are divided into groups with two sensors each, where sensors in each pair cooperate to send their decisions as a DSTC. Differential modulation scheme, which does not require knowledge of the instantaneous fading gains, is considered to avoid the channel estimation overhead at the cooperating sensors and the fusion center. Channels between sensors and the fusion center are assumed independent identically distributed (i.i.d) Rayleigh fading channels. Moreover, Jakes-Clarkes’ channel model is considered to model the mobility of sensors and/or the fusion center. Since the complexity of the optimal fusion rule grows up exponentially with the observation interval, suboptimal fusion rules are derived and discussed. Finally, simulation results of the proposed cooperative scheme are provided and the detection capabilities of the derived decision fusion rules are compared.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.016
      Issue No: Vol. 80 (2017)
       
  • Design of low observable antenna using active hybrid-element FSS structure
           for stealth applications
    • Authors: Shiv Narayan; Balasubramaniyam Sangeetha; Thattanvalappil Vasu Sruthi; Vadeyanapur Shambulingappa; Raveendranath Unnikrishnan Nair
      Pages: 137 - 143
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Shiv Narayan, Balasubramaniyam Sangeetha, Thattanvalappil Vasu Sruthi, Vadeyanapur Shambulingappa, Raveendranath Unnikrishnan Nair
      A novel EM (electromagnetic) design of low observable antenna using active hybrid-element frequency selective surface (FSS) as ground plane is presented in this paper for stealth applications. The EM characteristics of active hybrid-element FSS structure are reconfigured from reflecting mode to transmitting mode and vice versa by switching ON and OFF the PIN diode at 10GHz. In ON state of diode (reflection mode), the FSS structure shows extremely less transmission (<−40dB), which corroborates its suitability for ground plane of antenna. In OFF state of diode (transmission mode), it exhibits bandpass response over the frequency range 9.3–10.7GHz corresponding to very less power loss (<−0.42dB). Further, a low observable microstrip patch antenna (MPA) is designed using proposed FSS structure as ground plane and its EM characteristics are studied using commercial software package. In ON state of diode, the FSS-based MPA is observed to perform as typical MPA and its out-of-band radar cross section (RCS) also reduces as well. In OFF state of diode, FSS-based antenna does not radiate while passes EM signal impinging on its structure in result reduces significantly in-band RCS (up to 15.8dBmm2) as compared to conventional MPA. Finally, a prototype active FSS-based antenna is fabricated and measured for proof-of-the concept.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.038
      Issue No: Vol. 80 (2017)
       
  • Feasibility and modelling for convergence of optical-wireless network
           – A review
    • Authors: Love Kumar; Vishal Sharma; Amarpal Singh
      Pages: 144 - 156
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Love Kumar, Vishal Sharma, Amarpal Singh
      Now a days, the convergence of wireless and optical network gaining popularity to enhance the data carrying capacity, QoS and to support future multimedia applications. The queue theory plays an important role for analytically evaluating such converged networks. In the everyday state of affairs, queue phenomena are observed in the several situations like the health clinic, railway reservation system, automobile laundry centre, bank cash counter, call centre, etc. Similarly, the phenomenon of congestion is ascertained in the telephone network, computer network, communication systems and the Internet wherever nonstop enhancements need to be created to stay up with the quickly growing demand. The subsistence of these adverse clogging effects has lead toward the improvement of queuing theory-based statistical models. Therefore, these queues based statistical models answering to optimising queries corresponding to the way for assigning resources in converged optical and wireless networks. During this paper, a review on the role of the queuing model in wireless & optical communication is presented that concentrate on the present and future aspects of research.

      PubDate: 2017-07-08T08:01:29Z
      DOI: 10.1016/j.aeue.2017.06.027
      Issue No: Vol. 80 (2017)
       
  • Current mode single-input multi-output MOSFET-only filter
    • Authors: Abdullah Yesil; Deniz Ozenli; Emre Arslan; Hakan Kuntman
      Pages: 157 - 164
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Abdullah Yesil, Deniz Ozenli, Emre Arslan, Hakan Kuntman
      In this paper, a very simple topology of a current mode MOSFET-only filter with single-input and multi-output is proposed. It is very important to emphasize that it is possible to obtain five of the filter functions, namely low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) using the proposed topology without using external passive elements. The core circuit of the proposed filter employs only four MOS transistors; therefore, it occupies very small chip area. It is also possible to adjust the filter gain with the biasing voltage. In addition, the circuit exhibits a very low input impedance and also high output impedances which make it possible for cascading. The MOSFET capacitances which determine the transfer functions are all grounded, so physical capacitances can be used instead of MOSFET parasitic capacitances to operate the filter at very low frequencies. Moreover, proposed filter structure has low supply voltage as 1V in order to be applicable to low voltage operations. Detailed simulation results, including noise and Monte Carlo analysis, are provided using 0.18µm TSMC technology parameters to verify the feasibility of the filter circuit.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.037
      Issue No: Vol. 80 (2017)
       
  • Loaded dipole antennas with new CRLH cell configuration
    • Authors: Mahmoud A. Abdalla; Mohamed H. Ghouz; Mohamed Abo El-Dahab
      Pages: 165 - 171
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Mahmoud A. Abdalla, Mohamed H. Ghouz, Mohamed Abo El-Dahab
      In this paper, two different triple band dipole antennas loaded by new modified composite right left handed cell are presented. The modified cell can introduce large electrical length in small size. Thus, the two antennas are designed with smaller operating frequency or reduced physical length compared to a single frequency reference dipole. The designed antennas can serve different wireless services for GPS (1.27GHz and 1.55GHz), UMTS (1.85GHz), and WiFi (2.4GHz) in triple band functionalities. The lower operating frequency antenna size is (70×70 mm2) whereas the reduced physical length antenna size is (60×70mm2). At mid band frequencies the reduced frequency antenna length is (0.29 λ0, 0.37 λ0, and 0.52 λ0), whereas that of the reduced physical length is (0.28 λ0, 0.41 λ0, and 0.56 λ0), at triple band mid frequency, respectively. Compared to a typical dipole antenna, the designed loaded dipoles can achieve a length reduction that can reach up to 50%. Moreover, the antenna has good gain at the triple bands (−1.2dB, 1.9dB and 3.5dB for reduced operating frequency antenna and −3.1dB, 1.2dB and 3.4dB for the reduced length antenna. The two antennas have good radiation efficiency that can reach up to 84% on a low cost antenna substrate. The mathematical analysis, full wave simulation and experimental measurements of the reported antennas are introduced.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.029
      Issue No: Vol. 80 (2017)
       
  • Realization of constant envelope OFDM using quantization and CPM technique
    • Authors: Sajad Rezaie; Abbas Mohammadi; Navvab Afrashteh; Vahideh Sanjaroonpouri
      Pages: 172 - 178
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Sajad Rezaie, Abbas Mohammadi, Navvab Afrashteh, Vahideh Sanjaroonpouri
      Orthogonal frequency division multiplexing (OFDM) is used in many wireless communication. The important drawback of this modulation is its high peak-to-average power ratio (PAPR). In this paper, a new modulation scheme of constant-envelope OFDM (CE-OFDM) is proposed. This scheme uses a combination of OFDM, quantizer and continuous phase modulation (CPM) to achieves 0dB PAPR. The statistical signatures of signals, based on system parameters such as the length of discrete Fourier transform (DFT) and the number of quantization levels are presented. There are two sources of noise in proposed CE-OFDM scheme: quantization noise and channel noise. The theoretical analysis of these noises is presented. Moreover, the bit error rate (BER) performance of CE-OFDM over additive white Gaussian noise (AWGN) is analyzed. The simulation results show that the proposed system has unity PAPR and the symbol error rate (SER) performance of CE-OFDM is the same as the theoretical analysis.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.035
      Issue No: Vol. 80 (2017)
       
  • Performance evaluation of the adaptive sidelobe canceller system with
           various auxiliary configurations
    • Authors: Jafar Ramadhan Mohammed; Khalil Hassan Sayidmarie
      Pages: 179 - 185
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Jafar Ramadhan Mohammed, Khalil Hassan Sayidmarie
      In practical radar systems, the conventional adaptive sidelobe canceller (SLC) works very well as long as the input signal-to-interference-plus-noise (SINR) ratio is low or when the desired signal is known to be absent during certain time intervals. However, under high SINR, attenuation in the direction of the desired signal is inevitable. In this paper, the conventional sidelobe canceller is improved by replacing the separate auxiliary antennas by a number of existing elements of the main antenna array. This modification makes the proposed SLC different from the conventional one because the desired signal components of the main channel and auxiliary signals may be correlated. Such correlation may cause serious attenuation in the desired signal especially when the number of reused elements from both of the main array and auxiliary antenna is increased. The resulting malfunctioning of the desired signal cancellation is eliminated by adjusting the weights of the reused elements to produce a specific cancellation pattern. The required cancellation pattern should have two main features: first, it should have a level equal to that of the main array pattern at the interferer direction. Second, it should have a very low level or a null at the direction of the desired signal. The simulation results show that good performance for interference cancellation, maintaining a distortionless response for the desired signal, and low sidelobe level can be obtained by using the proposed technique. Besides the simplicity and low cost, the other advantage of the proposed SLC is that it can work effectively regardless of the strengths of the desired signal.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.06.039
      Issue No: Vol. 80 (2017)
       
  • Design of a novel bandwidth-enhanced double-slot TSA and analysis
           according to the microwave network theory
    • Authors: Ya-Qiao Liu; Jian-Gang Liang; Ya-Wei Wang
      Pages: 186 - 192
      Abstract: Publication date: October 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 80
      Author(s): Ya-Qiao Liu, Jian-Gang Liang, Ya-Wei Wang
      In this paper, a novel bandwidth-enhanced ultra-wideband (UWB) tapered slot antenna with Y-shaped corrugated edges, is proposed. In the double-slot structure, the two slots are separated by a V-shaped metal surface with straight edges, which is beneficial to improve the directivity of the antenna. Meanwhile, an exponential Y-shaped corrugated edge is designed. This novel corrugated edge can not only improve the impedance bandwidth, but also enhance the gain of the antenna. Additionally, according to the theory of microwave network, this paper analyzes the reason of bandwidth enhancement realized by double-slot structure. The proposed antenna provides 167% fractional bandwidth from 2.5GHz to 28GHz. The gain of the proposed antenna is more than 10dB from 3.5GHz to 25GHz, and more than 8dB at the whole operating band.

      PubDate: 2017-07-20T16:58:00Z
      DOI: 10.1016/j.aeue.2017.05.017
      Issue No: Vol. 80 (2017)
       
  • Low-complexity scheduling for energy-efficient transmission of packets
           with individual deadlines
    • Authors: Siping Liu; Zhangdui Zhong
      Pages: 1 - 8
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Siping Liu, Zhangdui Zhong
      This paper aims at energy-efficient transmission of packets with individual deadlines. In order to reduce the transmission energy of a packet, a lower data rate should be adopted, while the deadline restraint leads to a rate lower limit. It is derived theoretically that the energy-optimal transmission, i.e., the transmission consuming the minimal energy, follows three theorems: (1) the rate is invariable except for the deadlines of the packets; (2) the rate is non-increasing over the whole transmission time; (3) if the rate decreases at a deadline, only the terminated packets have been transmitted. Then, a scheduling algorithm based on backward unidirectional valve (BUV) is proposed, where the packets are divided into multiple groups and each group corresponds to a fixed rate. Specifically, the packets are handled one by one, and any packet is taken as a new group in the initial. If the transmission rate of the new group is not lower than that of its preceding neighboring group, the two groups are amalgamated into one, and this procedure is implemented constantly before the rate decreases in stairs. The BUV scheduling not only achieves the energy-optimal transmission, but also has a low computational complexity.

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.04.036
      Issue No: Vol. 79 (2017)
       
  • Improved online fountain codes based on shaping for left degree
           distribution
    • Authors: Taiqi Huang; Benshun Yi
      Pages: 9 - 15
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Taiqi Huang, Benshun Yi
      In this paper, an improved encoding scheme for online fountain codes is proposed with the joint optimization of variable node degree and check node degree is proposed. The coding scheme can be divided into the build-up phase and the completion phase. In the build-up phase, left degree distribution is exploited to guarantee optimal performance phase by modifying the traditional coding scheme of choosing input symbols uniformly at random. A memory-based selecting of the source symbols is employed to decrease the number of connected components, which can thus produce the dimension increasement of the linear subspace of a decoding graph constructed in the build-up phase. The upper bound on coding overhead is also derived from the analysis of random graph theory. Compared with conventional online fountain codes, it can be seen from the simulation results that the proposed scheme can provide significant performance improvement with respect to both coding overhead and feedback cost. Moreover, the lower encoding/decoding complexities may make the proposed scheme more practical in energy-constrained applications such as distributed storage.

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.05.035
      Issue No: Vol. 79 (2017)
       
  • Compact wideband Gysel power dividers with harmonic suppression and
           arbitrary power division ratios
    • Authors: Hamed Shahi; Hossein Shamsi
      Pages: 16 - 25
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Hamed Shahi, Hossein Shamsi
      This paper presents a wideband power divider (PD) with a high level of harmonic suppression, wide stopband bandwidth, arbitrary power division ratios, miniaturized dimensions, and high power-handling capability (PHC). The proposed structure consists of five open stubs to suppress the second- to forth- harmonic frequencies, two grounded resistors for better PHC, one resistor between output ports for enhancing the bandwidth of the circuit, and six branch line sections. Derivation of closed-form equations has been performed for the parameters of the proposed structure. The circuit has the flexibility in choosing the values of two load resistors to determine the bandwidth and the level of PHC. To demonstrate the features of the proposed PD, four different examples of the structure are conducted. Furthermore, for verification purposes, two prototypes of the PD with different power division ratios are fabricated and measured at 1GHz. Meanwhile, the PDs have power division ratio of k2 =1 and k2 =1.5. The simulation and measurement results have good agreement with each other and confirm the theoretical procedure. This new structure is suitable for wideband, miniaturized, arbitrary power division ratios, and high power applications.

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.05.024
      Issue No: Vol. 79 (2017)
       
  • A low-power rail-to-rail input-range linear delay element circuit
    • Authors: Hassan Rivandi; Sudeh Ebrahimi; Mehdi Saberi
      Pages: 26 - 32
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Hassan Rivandi, Sudeh Ebrahimi, Mehdi Saberi
      Delay elements are one of the key components in many time-domain circuits such as time-based analog-to-digital converters. In this paper, a new rail-to-rail current-starved delay element is proposed which not only presents good linearity for the voltage-delay curve over the input range of ground to supply voltage, but also it consumes a dynamic power only during the transition times without consuming any static power. The proposed delay element is designed and simulated in a 0.13-µm CMOS technology with a supply voltage of 1.2V. Post-layout simulation results demonstrate that the proposed circuit has a linear voltage-delay transfer function with a voltage-to-time gain of −1.33ps/mV. Moreover, when samples of a full-scale sin-wave input signal are applied to the proposed circuit with a clock frequency of 100MHz, the power consumption is 30µW, and signal-to-noise-and-distortion ratio (SNDR) of the output delay times is 30.4dB, making it suitable for use in a time-based analog-to-digital converter with up to 5-bit resolution.

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.04.037
      Issue No: Vol. 79 (2017)
       
  • An efficient privacy-preserving scheme for secure network coding based on
           compressed sensing
    • Authors: Dong Xie; Haipeng Peng; Lixiang Li; Yixian Yang
      Pages: 33 - 42
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Dong Xie, Haipeng Peng, Lixiang Li, Yixian Yang
      Network coding (NC) provides an elegant solution for improving capacity and robustness in computer networks. Different to traditional “store-and-forward” transmission paradigm, each intermediate node linearly combines received data packets, and the original files can be decoded at the sink nodes in NC settings. This brand-new paradigm is vulnerable to pollution attack, which means that some malicious nodes inject fake data packets into the network and this will lead to incorrect decoding. There are some information-theoretical solutions and cryptographic solutions for solving this security issue, and most existing schemes can thwart data pollution attacks. However, the privacy of the original files are vital to some application environments (e.g. military network). To the best of our knowledge, there is not a secure scheme which can thwart pollution attack and can protect the privacy of transmitted data simultaneously. In this paper, we present an efficient privacy-preserving scheme for secure network coding based on compressed sensing (CS), which has attracted considerable research interest in the signal processing community. Specifically, we embed CS into the general NC framework, i.e., the source node needs to compress each original data packet using the sensing matrix before creating the augmented vector and the sink nodes require to perform an additional CS reconstruction algorithm for reconstructing the original file. In addition, we construct a simple key distribution protocol and each intermediate node just needs two secret keys for verifying the integrity of received data packets. Such novel hybrid construction enables the privacy-preserving guarantee, and the performance comparison shows the high-efficiency of our scheme in terms of the computational complexity and communication overhead.

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.05.028
      Issue No: Vol. 79 (2017)
       
  • Chaos generation in fractional-order switched systems and its digital
           implementation
    • Authors: E. Zambrano-Serrano; J.M. Muñoz-Pacheco; E. Campos-Cantón
      Pages: 43 - 52
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): E. Zambrano-Serrano, J.M. Muñoz-Pacheco, E. Campos-Cantón
      A double-scroll chaotic attractor generated by a fractional-order switched system is presented. Based on unstable dissipative systems (UDS) and a switching law, a fractional-order UDS is proposed. Chaos behavior is found with a fractional order as low as 2.568 by satisfying the stability criterion for fractional order chaotic systems. The fractional-order switched system is transformed to an equivalent switched system with augmented states. Then, the equivalent system is straightforward implemented on an ARM system-on-chip board by using Python high level programming language. Numerical simulations are in good agreement with experimental results, which demonstrates the usefulness of proposed method. Additionally, the test 0–1 and a chaos definition for finite state sets are given to demonstrate chaotic behavior. Finally, a random number generator is also proposed as a possible application.

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.05.032
      Issue No: Vol. 79 (2017)
       
  • A modified Otsu’s algorithm for improving the performance of the energy
           detector in cognitive radio
    • Authors: A.J. Onumanyi; E.N. Onwuka; A.M Aibinu; O.C. Ugweje; M.J.E. Salami
      Pages: 53 - 63
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): A.J. Onumanyi, E.N. Onwuka, A.M Aibinu, O.C. Ugweje, M.J.E. Salami
      In this paper, we present a modified Otsu’s algorithm for solving the automatic threshold estimation problem in energy detection based Cognitive Radio (CR) application. The modified algorithm was tested extensively and compared with other known algorithms using both simulated and real datasets. In particular, our findings reveal that the modified algorithm provides an averagely lower false alarm rate than the other techniques compared with in this paper. Furthermore, the results obtained show that the algorithm is independent of the bandwidth’s size, while having a total complexity of O ( V ) , where V is the total sample size. Thus, from the results of this paper, full and effective automatic blind spectrum sensing using an Energy Detector is possible in CR. This can be achieved at a Signal-to-Noise Ratio of 5dB to meet the IEEE 802.22 draft standard of P D > 90 % and P FA < 10 % .

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.04.013
      Issue No: Vol. 79 (2017)
       
  • A systematic realization of third-order quadrature oscillator with
           controllable amplitude
    • Authors: Hua-Pin Chen; Yuh-Shyan Hwang; Yi-Tsen Ku
      Pages: 64 - 73
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Hua-Pin Chen, Yuh-Shyan Hwang, Yi-Tsen Ku
      A systematic realization of third-order quadrature oscillator using a voltage-mode non-inverting lowpass filter and a voltage-mode inverting lossless feedback integrator is presented in this paper. The proposed circuit consists of two multiple-output differential voltage current conveyor transconductance amplifiers (MO-DVCCTAs), two grounded resistors and three grounded capacitors. The new circuit provides three quadrature voltage outputs, two high-impedance quadrature current outputs, and one high-impedance current output with controllable amplitude, simultaneously. When the input bias current of the first MO-DVCCTA is a modulating signal, the circuit can generate amplitude modulation or amplitude shift keying signals. The condition of oscillation and the frequency of oscillation can be controlled independently through grounded resistors. The proposed circuit only uses grounded capacitors and grounded resistors, which can be easily implemented as an integrated circuit. The experimental results and H-Spice simulation results are given to confirm the theoretical analysis.

      PubDate: 2017-06-05T07:03:08Z
      DOI: 10.1016/j.aeue.2017.05.039
      Issue No: Vol. 79 (2017)
       
  • New differential difference stage and its application to band-pass filter
           at 10.7MHz with high quality factor
    • Authors: Abdullah Yesil; Firat Kacar; Shahram Minaei
      Pages: 74 - 82
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Abdullah Yesil, Firat Kacar, Shahram Minaei
      In this study, we present a new NMOS implementation of differential difference stage containing only eight transistors. The introduced new differential difference stage has high input impedance and low output impedance; accordingly, it can be directly cascaded without loading effect. In addition, a detailed study on the input referred noise voltage density of the proposed differential difference stage is performed and low noise design possibility is investigated. As an example, to show performance of differential difference stage, a modified band-pass filter with high quality factor is presented for intermediate frequency stage of FM receiver. Furthermore, the non-ideal, parasitic and stability analyses of the presented filter having high quality factor are surveyed and its working boundaries are determined.

      PubDate: 2017-06-10T07:26:01Z
      DOI: 10.1016/j.aeue.2017.05.022
      Issue No: Vol. 79 (2017)
       
  • Optimum design of a wideband planar N-way fork power divider with
           arbitrary power division and input-to-output impedance matching
    • Authors: Homayoon Oraizi; Atie Yousefi
      Pages: 83 - 93
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Homayoon Oraizi, Atie Yousefi
      An effective design procedure based on method of least squares is proposed for multi-section and multi-output fork power divider/combiner with arbitrary power division ratios among its outputs in a specified frequency bandwidth together with impedance matching among its arbitrary source/load impedances. Transmission and scattering matrices are obtained for its equivalent circuit. An error function is constructed based on design specifications on its output power division ratios, isolations among output ports, return losses at its input and output ports and source/load impedances in a desired frequency bandwidth. The design procedure is fully developed, which determines the widths and lengths of microstrip line sections and resistor values. A design example is described for unequal power division ratio and unequal input/output impedances. A 3-section and 3-output fork power divider is designed for equal power division and load/source impedances for 2–12GHz band. It is fabricated and measured. Variations of its transmission coefficients are less than 0.5dB, isolations at its outputs are better than −15dB and reflection coefficients at its ports are better than −10dB. Excellent agreement is observed among the results of the proposed design procedure, full wave computer software and measurement data.

      PubDate: 2017-06-10T07:26:01Z
      DOI: 10.1016/j.aeue.2017.05.038
      Issue No: Vol. 79 (2017)
       
  • On the distributed order PID controller
    • Authors: Boris B. Jakovljević; Tomislav B. Šekara; Milan R. Rapaić; Zoran D. Jeličić
      Pages: 94 - 101
      Abstract: Publication date: September 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 79
      Author(s): Boris B. Jakovljević, Tomislav B. Šekara, Milan R. Rapaić, Zoran D. Jeličić
      This paper proposes a generalized fractional controller that covers the complete range of differintegrators of order −1 to order 1. This controller is named distributed order PID controller (DOPID) due to the fact that it broadens the structure of the conventional PID controller. Furthermore, a new method for implementation of distributed order PID controller (DOPID), as well as analysis of its properties in both time and frequency domain are proposed. As DOPID controller represents generalized classical PID controller, it is approximated by a compound fractional controller with multiple fractional differintegrators, with multiple gains, connected in parallel. Orders of these differintegrators have been equally spaced, with the first one being the first order classical integrator, and the last one being the first order classical differentiator. Noise cancellation filter is considered explicitly in the controller’s structure.

      PubDate: 2017-06-10T07:26:01Z
      DOI: 10.1016/j.aeue.2017.05.036
      Issue No: Vol. 79 (2017)
       
  • Performance analysis of space shift keying for AF relaying with relay
           selection
    • Authors: Ferhat Yarkin; Ibrahim Altunbas Ertugrul Basar
      Abstract: Publication date: November 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 81
      Author(s): Özgür Can Öztoprak, Ferhat Yarkin, Ibrahim Altunbas, Ertugrul Basar
      In this paper, we propose an amplify-and-forward multiple-input multiple-output (MIMO) relaying scheme, which combines space shift keying (SSK) with the best and partial relay selection. In this scheme, SSK transmission is considered by using the source (S) transmit antennas. Besides the direct link transmission, a relay, which is selected according to the best or partial relay selection techniques, amplifies the data received from S and forwards it to the destination (D). Theoretical error probability expressions of the proposed cooperative SSK systems are derived and an asymptotic diversity analysis is also performed to demonstrate the achievable diversity orders of the systems. It is shown that the proposed SSK systems outperform the conventional cooperative single-input multiple-output (SIMO) systems. It is also revealed that there is an interesting trade-off between SSK with the best and the partial relay selection in terms of error performance and complexity as in conventional cooperative SIMO systems. However, it is shown that the partial relay selection provides an almost identical error performance compared to the best relay selection with a considerably lower complexity when the number of relays is less than or equal to the number of receive antennas at D in the cooperative SSK system.

      PubDate: 2017-07-20T16:58:00Z
       
 
 
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