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Publisher: Elsevier   (Total: 3031 journals)

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Showing 1 - 200 of 3031 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: 16, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 79, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 22, 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: 303, 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  
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: 196, 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: 21, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 5, 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: 3, 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: 4)
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: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 119, 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: 8, 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: 24, 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: 21, 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: 26, 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: 8, 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: 39, 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: 38, 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: 41, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
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: 18, 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: 22)
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: 33, 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: 4)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 7, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
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: 5, 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: 21)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 6, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 3)
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: 20, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 14)
Advances in Pharmacology     Full-text available via subscription   (Followers: 13, 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: 17, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 56)
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: 1, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 332, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 7)
Advances in Surgery     Full-text available via subscription   (Followers: 6, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 28, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 14)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 12)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 42, 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: 303, 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: 4, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 7, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 388, 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: 29, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 36, 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: 48, 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: 3, 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: 5)
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: 7, 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: 5, 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: 6, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 45, 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: 45, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 47, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 34, 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: 14, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 32, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 25, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 31, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 48, 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: 173, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 51, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 2)
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: 22, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 23, 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: 32, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 13, 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: 52, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 3)
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: 151, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 7, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Anesthésie & Réanimation     Full-text available via subscription  
Anesthesiology Clinics     Full-text available via subscription   (Followers: 21, 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: 141, 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   (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  [3031 journals]
  • Jamming Mitigation using an Improved Fuzzy Weighted Least Square Method in
           Combined GPS and GLONASS Receiver
    • Authors: Mohammad-Reza Mosavi; Atieh Khavari; Amir Tabatabaei; Mohammad-Javad Rezaei
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Mohammad-Reza Mosavi, Atieh Khavari, Amir Tabatabaei, Mohammad-Javad Rezaei
      One of the important concerns in Global Positioning System (GPS) is interference and jamming attack. Different methods have been proposed to mitigate GPS jamming such as antenna array and digital signal filtering. In this paper, the integration of GPS with Russian Global Navigation Satellite System (GLONASS) is utilized to overcome this issue. Increasing the number of visible satellites is a significant benefit of this combined system. We also introduce an improved Fuzzy-Weighted Least-Square (FWLS) method to weight the information according to its transmitter system reliability and satellite properties. The experimental comparison between the proposed method and an improved Wavelet-Packet-Transform (WPT)-based anti-jammer shows that though the accuracy of WPT-based method is more than FWLS method, the FWLS has significantly less computation complexity and more reliability.

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.007
      Issue No: Vol. 76 (2017)
       
  • Electronically controllable grounded inductance simulators using single
           commercially available IC: LT1228
    • Authors: Surapong Siripongdee; Winai Jaikla
      Pages: 1 - 10
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Surapong Siripongdee, Winai Jaikla
      The grounded inductance simulators using available commercially integrated circuit (IC) are proposed in this paper. The three types of active inductor called parallel R and L, series R and L and pure L are achieved. The proposed inductance simulators consist of single available commercially IC from Linear Technology Inc. called LT1228 with a resistor and a capacitor. The tune of inductance and resistance value can be done electronically. The proposed inductance simulators don’t require any active and passive component matching condition. The performances of proposed circuit are verified through PSPICE simulation and experiment. To show the usability of the proposed simulators, they are used to realize the sinusoidal oscillator, second order bandpass filter and second order band-reject filter. The workability of these applications is experimented. The results agree well with theoretical expect.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.018
      Issue No: Vol. 76 (2017)
       
  • WLAN indoor localization method using angle estimation
    • Authors: Yong Zhang; Lianlian Lu; Yujie Wang; Chen Chen
      Pages: 11 - 17
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Yong Zhang, Lianlian Lu, Yujie Wang, Chen Chen
      In WLAN indoor localization systems, an improved position fingerprinting algorithm is proposed to obtain higher accuracy. The algorithm constructs the nonlinear relationship between received signal strength indication (RSSI) values and the angles formed by horizontal line and the line from transmitters to receivers, instead of traditionally training the relationship between RSSI values and physical coordinates. The localization area is divided into a number of small rectangular areas, and the test points are sorted out by K-Nearest-Neighbor (KNN) algorithm. In a small rectangular area, RSSI values and the angles are trained by support vector machine (SVM), so as to estimate the angles formed by horizontal line and the line from test points to each access point (AP). Finally, coordinates of the test points are estimated using the geometric relationship. Two experimental sections have been conducted under different conditions: one is in the laboratory, and the other in a typical office space. The proposed algorithm is compared with v-SVM algorithm, KNN algorithm and ML algorithm. Experimental results prove that our proposed algorithm outperforms other methods in term of localization accuracy under various situations.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.019
      Issue No: Vol. 76 (2017)
       
  • Reversible data hiding for rightful ownership assertion of images in
           encrypted domain over cloud
    • Authors: Priyanka Singh; Balasubramanian Raman
      Pages: 18 - 35
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Priyanka Singh, Balasubramanian Raman
      The explosive growth in the multimedia contents is shifting the global infrastructure towards cloud based paradigm which is facilitated with enormous storage capacity and high end computational resources. However, the high chances of security breaches possible in the wide attacking surface of public cloud is alarming for measures that could put it in check. Encryption before outsourcing may serve as a possible solution but maintaining the same cloud services in encrypted domain is very challenging problem. Towards this end, we have proposed a reversible data hiding scheme in encrypted domain that will securely transmit the media information over cloud architecture and prove its rightful ownership. The scheme is based on Chinese Remainder Theorem(CRT) based secret sharing scheme that distributes the media information into multiple encrypted shares and embeds a secret information into the encrypted shares based on a secret key. These data embedded encrypted shares could now be securely outsourced to the remotely distributed cloud data centers where they may be attacked by the intruders. The robustness has been validated against different attack scenarios in the encrypted domain and the proposed scheme was found to be performing satisfactorily well.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.005
      Issue No: Vol. 76 (2017)
       
  • Constellation expanded active interference cancellation technique for
           suppression of out-of-band radiation in OFDM based cognitive radios
    • Authors: Gh. Rasool Begh; Ajaz Hussain Mir
      Pages: 36 - 45
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Gh. Rasool Begh, Ajaz Hussain Mir
      Cognitive radio is a novel technology to address the problem of spectrum under-utilization, by allowing the secondary users to dynamically use the spectrum of the primary users. OFDM is a potential candidate for the physical layer of cognitive radio, due to its inherent features of spectrum shaping, spectrum analysis and robustness to multipath. OFDM based cognitive radio, however suffers from out-of-band radiation (OOBR). In cognitive radio, suppression of OOBR is much more important as the interference to the primary users needs to be kept to the minimum possible level. In the literature, time and frequency characteristics of the transmitted signal have been exploited to minimize the OOBR. In this paper, we investigate the possibility of combining merits of the constellation expansion (CE) technique and the active interference cancellation (AIC) technique for suppression of OOBR. We show through simulations that the joint technique based on CE and AIC achieves much better OOBR reduction, with a slight degradation in error performance.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.016
      Issue No: Vol. 76 (2017)
       
  • Efficient reformulation of image reconstruction with compressive sensing
    • Authors: Ali H. Muqaibel
      Pages: 46 - 51
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Ali H. Muqaibel
      Sparse reconstruction techniques are used with radar imaging to construct high resolution images from a minimal amount of data. This reconstruction is computationally expensive. This paper proposes a computationally efficient formulation of radar imaging with and without compressive sensing. The dictionary matrix is decomposed into a product of a Toeplitz and sparse matrices to perform the required multiplication in an efficient way. The measurement matrix is rearranged to preserve the structure. The reduction in the order of complexity at differed compression rates as a result of the proposed formulation is evaluated.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.017
      Issue No: Vol. 76 (2017)
       
  • EBG-inspired reconfigurable patch antenna for frequency diversity
           application
    • Authors: Rahul Yadav; Piyush N. Patel
      Pages: 52 - 59
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Rahul Yadav, Piyush N. Patel
      In this paper, a periodic structure of electromagnetic band gap (EBG) unit-cell is discussed which can be used in designing a reconfigurable planar microwave antenna. The analysis of 3×3 structure of the EBG unit-cell is proposed. A reconfigurable antenna was realized by directly exciting the EBG structure with an impedance transformer. It is also made possible by providing ON-OFF switch to each of the unit-cell using PIN diodes. The two different bias configurations of the unit-cells based on the solution of the genetic algorithm are discussed and verified in the frequency range between 1GHz to 6GHz. The tested diversity frequencies at 2.215GHz, 2.6GHz and 3.02GHz are in agreement with the simulated dispersion profile of the EBG structure. A miniaturization up to 66% was achieved based on the solution of the genetic algorithm. The antenna will be useful to meet not only the demand of frequency diversity but also to support communication and sensing applications simultaneously.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.022
      Issue No: Vol. 76 (2017)
       
  • A multi-cell graph based dynamic resource allocation scheme for multi-user
           wireless networks
    • Authors: Romain Montagné; Alain Hertz; François Gagnon
      Pages: 60 - 70
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Romain Montagné, Alain Hertz, François Gagnon
      Dynamic resource allocation being a computationally difficult problem, static spectrum management is more commonly used in large-scale networks. The combination of virtualization technologies, where powerful centralized allocation algorithms can be implemented, and recent advances in graph coloring algorithms prompts the revisiting of this view. We describe a new graph based framework to maximize the number of simultaneously communicating mobiles in a wireless network. Since the considered problem is NP-hard, we propose various heuristic algorithms and analyze their performance, in comparison with standard decentralized channel assignment strategies such as Fractional Frequency Reuse (FFR). We consider the LTE uplink and downlink with the WINNER channel as the reference model. We show that for blocking probabilities below 2%, our scheme typically increases the number of mobile users by 25%. For example with 25 base stations and 120 channels, running the resource allocation scheme takes one second on a PC and permits to increase the number of mobiles requiring one single channel each from 750 to 950, a 25% increase in efficiency compared to FFR.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.015
      Issue No: Vol. 76 (2017)
       
  • Convergence performance analysis of an adaptive kernel width MCC algorithm
    • Authors: Weihua Wang; Jihong Zhao; Hua Qu; Badong Chen; Jose C. Principe
      Pages: 71 - 76
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Weihua Wang, Jihong Zhao, Hua Qu, Badong Chen, Jose C. Principe
      A fixed kernel width in MCC algorithm imposes a trade-off among robustness, convergence rate and steady-state accuracy. With a variable kernel width, the adaptive kernel width MCC (AMCC) algorithm can improve the learning speed of the MCC algorithm especially when the initial weight vector is far away from the optimal weight vector. In this paper, the steady-state excess mean square error (EMSE) of the AMCC algorithm is studied based on energy conservation relation. In addition, a novel convergence measure called initial convergence rate is introduced to evaluate the convergence speed at the beginning of the learning. Simulation experiments are carried out to verify the theoretical analysis and confirm the desirable performance of the AMCC algorithm in several different non-Gaussian noise environments.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.028
      Issue No: Vol. 76 (2017)
       
  • Widely linear generalized sidelobe canceling beamforming with variable
           diagonal loading
    • Authors: Aimin Song; Aiqi Wang; Shengyang Luan; Tianshuang Qiu
      Pages: 77 - 85
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Aimin Song, Aiqi Wang, Shengyang Luan, Tianshuang Qiu
      We propose a robust widely linear (WL) beamformer for noncircular (NC) signals in the presence of angle of arrival (AOA) errors or array random perturbations. In our beamformer, the block conjugate structure of covariance matrix is exploited to avoid updating the full weight vector, which reduces the computational loads. We add a variable diagonal loading term in the weight vector to improve the robustness of the WL beamformer. Moreover, the orthogonality constraint of block matrix is not required to calculate the amount of diagonal loading. Computer-simulation results show that the proposed WL beamforming provides improved performance over the conventional linear beamformers for NC signals in the presence of AOA errors and array random perturbations.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.025
      Issue No: Vol. 76 (2017)
       
  • Modified DVCC based quadrature oscillator and lossless grounded inductor
           simulator using grounded capacitor(s)
    • Authors: Ahmet Abaci; Erkan Yuce
      Pages: 86 - 96
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Ahmet Abaci, Erkan Yuce
      In this paper, a new quadrature oscillator (QO) and a new lossless grounded inductor simulator (LGIS) are proposed. The proposed QO uses only one negative-type modified differential voltage current conveyor (MDVCC−) with single Z terminal, two resistors and two grounded capacitors. The proposed LGIS employs only one MDVCC− with single Z terminal, two resistors and one grounded capacitor. However, the proposed LGIS requires a single passive component matching condition. Furthermore, a band-pass filter application is derived from the proposed LGIS. A number of simulations based on SPICE program and an experimental test are accomplished in order to demonstrate the performance of all the circuits.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.023
      Issue No: Vol. 76 (2017)
       
  • High-gain low-cost microstrip antennas and arrays based on FR4 epoxy
    • Authors: Babak Honarbakhsh
      Pages: 1 - 7
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Babak Honarbakhsh
      In this work, two previously reported low-cost design techniques for high-gain microstrip antennas are compared based on detailed parameter study. Both of these methods exploit a combination of a spacer and a layer of FR4 epoxy. The distinguishing feature of the said methods is the position of the metallization. A parameter study is performed on the thickness of the FR4 layer and its effect on the antenna gain, efficiency and pattern symmetry is reported. Capability of these methods is designing high-gain arrays is studied and specific design examples are provided. It is shown that the first method has superior performance in the sense of gain and efficiency. Especially, the first method supersedes the second one for high-gain arrays. As well, it is shown that the first method is a pure microstrip alternative to another previously reported technique wherein a CNC milled waveguide structure is exploited as the feed network.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.02.014
      Issue No: Vol. 75 (2017)
       
  • Multiband monopole antenna loaded with Complementary Split Ring Resonator
           and C-shaped slots
    • Authors: R. Samson Daniel; R. Pandeeswari; S. Raghavan
      Pages: 8 - 14
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): R. Samson Daniel, R. Pandeeswari, S. Raghavan
      This paper presents a compact semi circular monopole antenna loaded with Complementary Split Ring Resonator (CSRR) and two C-shaped slots is proposed for Global System for Mobile Communication (GSM), Worldwide Interoperability for Microwave Access (WiMAX) and C-band applications. The size of the proposed antenna is 20×20×0.5mm3. The resonance frequency of WiMAX (3.73GHz) is achieved by introducing CSRR slots on the ground plane. To realize multiband characteristics for GSM (1.77GHz), WiMAX (2.6GHz) and C-band (4.15GHz), two C-shaped slots of quarter wavelength are introduced in radiating element. The extraction procedure of negative permittivity for the proposed CSRR is discussed in detail. The proposed antenna is fabricated and measured. Simulated and measured results are in good agreement. Omni directional radiation pattern is obtained in H-plane and bi directional radiation pattern is obtained in E-plane. Parametric study of CSRR and C-shaped slot are examined to obtain best results. The proposed antenna has significant advantages, including low profile, miniaturization ability, and good impedance matching.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.001
      Issue No: Vol. 75 (2017)
       
  • Enhancement of ancient manuscript images by log based binarization
           technique
    • Authors: Jayanthi Natarajan; Indu Sreedevi
      Pages: 15 - 22
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Jayanthi Natarajan, Indu Sreedevi
      Enhancement of ancient manuscripts is a predominant field in the world of image processing. Binarization is the essential tool to recognize the text through OCR technologies for the preservation of the ancient manuscripts. This paper addresses the problem of enhancing and binarizing the deteriorated old manuscripts by a simple novel method called Log based binarization. The proposed method modifies the pixel intensity so as to better differentiate the black pixels and thus produce better binarization results, has been explored. Detailed comparison of existing thresholding algorithms with the new algorithm has been given. The inspiration for the new algorithm was drawn from the standard Niblack algorithm and Nick Algorithm.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.002
      Issue No: Vol. 75 (2017)
       
  • Capacity of the broadband dual-orthogonal polarized MIMO Land Mobile
           
    • Authors: Qingfeng Jing; Danmei Liu; Xin Liu
      Pages: 23 - 34
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Qingfeng Jing, Danmei Liu, Xin Liu
      Generally, the channel capacity of a MIMO system is closely related to its Channel Characteristic Matrix (CCM). In most current studies, the CCMs are formed by an independent identical distribution (i.i.d) model with Rayleigh or Rice distribution and nevertheless incomplete and inaccurate to describe a Broadband Dual-orthogonal Polarized MIMO Land Mobile Satellite (BDM-LMS) channel. In this paper, we build up the BDM-LMS channel model combining a 4-states broadband LMS channel model, time selective fading features, Channel Covariance Information (CCI) model and polarization correlation between antennas. Modeling steps of the channel model are introduced. The main emphasis is placed on the effects of the factors on the channel capacity in BDM-LMS system, such as antenna numbers, temporal correlations, terminal environments, elevation angles and polarization correlations between the DPAs. We provide simulation results to illustrate the effects of these factors through comparisons of the transmit rate, Ergodic Capacity and Outage Capacity. Moreover, the MIMO outage capacity advantages, indicating the benefits of MIMO compared with SISO systems under the same channel condition, are also studied under i.i.d and BDM-LMS channel.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.02.001
      Issue No: Vol. 75 (2017)
       
  • Precision of direction of arrival (DOA) estimation using novel three
           dimensional array geometries
    • Authors: Sarah Poormohammad; Forouhar Farzaneh
      Pages: 35 - 45
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Sarah Poormohammad, Forouhar Farzaneh
      Numerous methods for direction of arrival (DOA) estimation, used in smart antennas have been already reported in previous studies. The precision of DOA estimation depends on the choice of the algorithm and the geometrical configuration of the antenna array. In this work, the performance of new geometrical configurations, i.e. 2D with equal area and 3D with equal volume including circular, square, triangular, hexagonal and star geometries, with equal number of antenna elements, are examined and compared to each other to find the most proper geometry. Monte-Carlo simulations are performed to evaluate the DOA precision of the proposed arrays using the MUSIC algorithm. It is shown that in three cases of comparison including 2D geometries, 3D geometries and 3D rotated geometries, with the star and triangular configurations one achieves better resolution in DOA estimation. It is also revealed that the rotated configurations show lower estimation error compared to normal configurations.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.02.013
      Issue No: Vol. 75 (2017)
       
  • Network throughput and outage analysis in a Poisson and Matérn Cluster
           based LTE-Advanced small cell networks
    • Authors: Zoltán Jakó; Joydev Ghosh
      Pages: 46 - 52
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Zoltán Jakó, Joydev Ghosh
      In LTE-A (LTE-Advanced), the access network cell formation is an integrated form of outdoor unit and indoor unit. With the indoor unit extension the access network becomes heterogeneous (HetNet). HetNet is a straightforward way to provide quality of service (QoS) in terms better network coverage and high data rate. Although, due to uncoordinated, densely deployed small cells large interference may occur, particularly in case of operating small cells within the spectrum of macro base stations (MBS). This paper probes the impact of small cell on the outage probability and the average network throughput enhancement. The positions of the small cells are retained random and modelled with homogeneous Poisson Point Process (PPP) and Matérn Cluster process (MCP). The paper provides an analytic form which permits to compute the outage probability, including the mostly applied fast fading channel types. Furthermore, simulations are evaluated in order to calculate the average network throughput for both random processes. Simulation results highlights that the network throughput remarkably grows due to small cell deployment.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.006
      Issue No: Vol. 75 (2017)
       
  • Proportionate NSAF algorithms with sparseness-measured for acoustic echo
           cancellation
    • Authors: Yi Yu; Haiquan Zhao
      Pages: 53 - 62
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Yi Yu, Haiquan Zhao
      In acoustic echo cancellation (AEC), the sparseness of impulse responses can vary over time or/and context. For such scenario, the proportionate normalized subband adaptive filter (PNSAF) and μ-law (MPNSAF) algorithms suffer from performance deterioration. To this end, we propose their sparseness-measured versions by incorporating the estimated sparseness into the PNSAF and MPNSAF algorithms, respectively, which can adapt to the sparseness variation of impulse responses. In addition, based on the energy conservation argument, we provide a unified formula to predict the steady-state mean-square performance of any PNSAF algorithm, which is also supported by simulations. Simulation results in AEC have shown that the proposed algorithms not only exhibit faster convergence rate than their competitors in sparse, quasi-sparse and dispersive environments, but also are robust to the variation in the sparseness of impulse responses.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.009
      Issue No: Vol. 75 (2017)
       
  • Band-pass filter with high quality factor based on current differencing
           transconductance amplifier and current amplifier
    • Authors: Abdullah Yesil; Firat Kacar
      Pages: 63 - 69
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Abdullah Yesil, Firat Kacar
      This paper presents second order band-pass filter with high quality factor. Its high quality factor is provided by feedback circuit. The used second order filter is modified so that filters outputs through capacitor can be obtained to high impedance output. Thereby, there is no need the extra active element to obtain filter outputs. Also, the output stage of current differencing transconductance amplifier have only X− terminals instead of X+ and X− terminals. Furthermore, the quality factor of the band-pass filter with feedback circuit is increased by feedback gain consisting of only four transistors. Besides, to examine effects of parasitic elements, non-ideal and sensitivity, the overall structure is investigated deeply. Working conditions and boundaries of the overall structure is also defined. The simulation demonstrates good agreement between the theoretical expectations and simulation results.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.007
      Issue No: Vol. 75 (2017)
       
  • A CDMA scheme based on perfect Gaussian integer sequences
    • Authors: Ho-Hsuan Chang; Shieh-Chiang Lin; Chong-Dao Lee
      Pages: 70 - 81
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Ho-Hsuan Chang, Shieh-Chiang Lin, Chong-Dao Lee
      Both m-sequences and Gold sequences have been applied as the pseudonoise (PN) code in the code division multiple access (CDMA) scheme to enable distinct users to simultaneously share the available capacity of a common channel, which is called direct sequence CDMA (DS-CDMA). However, this scheme does not provide the required ideal periodic cross-correlation function property among various members of sequences within the same set. This paper proposes a new perfect Gaussian integer sequence (PGIS)-based CDMA scheme called PGIS-CDMA; in this scheme, the PN code of DS-CDMA is replaced by a set of PGISs. The intrinsic orthogonal property of PGIS can be applied to a CDMA system to achieve perfect cochannel interference separability under the ideal synchronism; it can also be adapted at the receiver to obtain diversity gain and improve the carry-to-interference ratio. These two concepts are further developed to implement two PGIS-CDMA configurations, and they can outperform DS-CDMA on the basis of Gold sequences that possess a favorable cross-correlation property for the CDMA scheme.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.008
      Issue No: Vol. 75 (2017)
       
  • Synchronization and chaos in coupled memristor-based FitzHugh-Nagumo
           circuits with memristor synapse
    • Authors: Jihong Zhang; Xiaofeng Liao
      Pages: 82 - 90
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Jihong Zhang, Xiaofeng Liao
      The memristor has drawn a significant interest in the fields of neuromorphic circuits because the nanoscale memristor is a strong candidate to become the critical element of novel ultra-high density low-power non-volatile memories. In the present paper, we focus on networks of FitzHugh-Nagumo neuron circuits employing memristor. First, we build the memristor-based circuit of FitzHugh-Nagumo model. The details of the chaotic phenomena of the memristor-based FitzHugh-Nagumo circuit under external stimuli have been found with use of computer simulations, i.e., we have numerically calculated waveformdiagrams, phase portraits, Lyapunov exponents and bifurcation diagram. And we also confirm these results of theoretical analyses and numerical calculations by circuit simulation experiments of the actual analog circuit realization using Multisim modeling. Then the synchronization of coupled memristor-based chaotic neurons with memristor synapse is discussed, and synchronization mechanism is also found. Finally, we have also derived the sufficient conditions of chaotic synchronization in unidirectional coupled neuron circuits and bidirectional coupled neuron circuits respectively, which are that the parameter of memristor synapse must meet certain conditions. These results of theoretical analyses have been confirmed by numerical simulation.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.003
      Issue No: Vol. 75 (2017)
       
  • Measurement of a metamaterial antenna angular power reception performance
           utilizing Software Defined Radio
    • Authors: Huseyin Akcelik; Yilmaz Durna; Safak Saraydemir; Hasan Kocer
      Pages: 91 - 97
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Huseyin Akcelik, Yilmaz Durna, Safak Saraydemir, Hasan Kocer
      In wireless communication systems, angular positioning is an important aspect affecting the behavior of an antenna reception performance. In this study, a broadband, high gain rectangular microstrip patch antenna using planar-patterned metamaterial concept and its measured angular power reception performance are presented. The metamaterial antenna’s −10dB bandwidth is achieved as 2.42GHz in the frequency range of 2.89–5.31GHz with the peak gain of 5.56dBi. Angular power reception performance of the proposed antenna is measured for different selected intervals in indoor and outdoor environments with the help of Software Defined Radio. The antenna is orientated vertically/horizontally and rotated in the azimuth Ø plane from 0° to 360° with angular resolution of ΔØ =45°. The measured received power distributions are shown at angle versus distance and compared.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.013
      Issue No: Vol. 75 (2017)
       
  • Utility of RF MEMS miniature switched capacitors in phase shifting
           applications
    • Authors: Amrita Chakraborty; Bhaskar Gupta
      Pages: 98 - 107
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Amrita Chakraborty, Bhaskar Gupta
      This paper demonstrates research carried out towards the development of switched capacitors having miniature dimensions. Such devices are based on the Radio Frequency Micro Electro Mechanical Systems (RF MEMS) technique which has gained prominence in implementing a wide variety of microwave and millimetre devices till date. Switched capacitors having standard or conventional dimensions are prone to several limitations which are addressed by scaling down the standard dimensions by 150× times (in terms of area requirement). Such switched capacitors are employed to develop phase shifters working in K-band (22GHz) frequency range to yield appreciable performance both in terms of electromechanical and RF characterizations. Such switched capacitors are utilized to develop phase shifters which find immense applications in the design of Phased Array RADARs. Switched capacitors fabricated on 500µm thick quartz substrates, result in 30° phase shift (0.66mm×1mm in dimension) with associated minimum −0.18dB insertion loss and better than −21dB reflection coefficient at 22GHz frequency. Electromechanical characterization reports an actuation voltage of 14.6V, mechanical vibration frequency of 2.5MHz and a switching time of 620ns respectively. Demonstrations showing complete realization of 180° phase shifter (4mm×1mm) employing a cascaded arrangement of six similar 30° unit cells are also included in this paper.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.011
      Issue No: Vol. 75 (2017)
       
  • An energy efficient approach for data collection in wireless sensor
           networks using public transportation vehicles
    • Authors: Hailong Huang; Andrey V. Savkin
      Pages: 108 - 118
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Hailong Huang, Andrey V. Savkin
      Applications of wireless sensor networks (WSNs) involve a large number of energy constrained nodes to monitor the areas of interest, where the energy efficiency is an important concern of network design. Compared to the conventional approach using multihop communication, mobile sinks (MSs) attached to public transportation vehicles, such as buses, are the ideal infrastructure for collecting sensory data. This paper studies the problem of using such MSs to collect data from sensor nodes that are nonuniformly deployed. The proposed protocol aims at balancing the energy consumption, including energy expenditure to transmit data packet and network overhead across the network, to make the network operate as long as possible with all nodes alive. We design an energy-aware unequal clustering algorithm and an energy-aware routing algorithm. Theoretical analysis and simulation results confirm the effectiveness of the proposed approach against the alternative methods.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.012
      Issue No: Vol. 75 (2017)
       
  • Wideband directional antenna system with different polarizations for
           wireless communication system
    • Authors: Xi-Wang Dai; Xiao-Yu Zhou; Guo-Qing Luo
      Pages: 119 - 123
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Xi-Wang Dai, Xiao-Yu Zhou, Guo-Qing Luo
      A novel directional antenna system with different polarizations is proposed for wireless communication system application in this paper. The proposed antenna employs modified E-shaped rectangular patch for vertical polarization and crossed dipoles for ±45° slant polarization. The vertically polarized (VP) element is formed by inserting a pair of wide slits at the boundary of rectangular patch with edge folded. The VP element is fed by using an L-probe feed, designed to work at the frequency range of 773–1013MHz for GSM900 and other wireless communication systems such as GSM850 and LTE700 bands. Dual slant polarized (SP) elements are formed with two orthogonally situated dipoles with corner cut and slots on the patch, which yields a wide impedance bandwidth of 55.5% covering the frequency bands for 3G and LTE communication systems. A wideband diplexer is used to connect VP element and +45° SP element, forming a compact structure. Simulated and measured results show that peak gains of 8.0dBi for VP element and 9.5dBi for ±45° SP element, an isolation better than 26dB over the working frequency bands are achieved. The cross-polarization levels in the azimuth plane for triple polarization states are lower than −14dB.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.014
      Issue No: Vol. 75 (2017)
       
  • A novel Segregated K-Best detection algorithm for low complexity near
           optimal MIMO receivers
    • Authors: Pranay Joshi; Shreyas Joshi; Varun Jain; Sunil Joshi
      Pages: 130 - 139
      Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75
      Author(s): Pranay Joshi, Shreyas Joshi, Varun Jain, Sunil Joshi
      This paper addresses the problem of computational and hardware complexity in higher order constellation Multiple Input Multiple Output (MIMO) detectors. A novel Segregated K-Best detection (SKD) algorithm is proposed to serve as low complexity near optimal detector for MIMO receivers. The algorithm reduces detection complexity by choosing an optimal value of K depending upon the layer of traversal. This allows lesser number of nodes to be traversed leading to reduced complexity with only slight degradation in error rate performance. Hardware Descriptive Language (HDL) implementation of SKD is performed using ‘one symbol detection per cycle architecture’ and a compatible ‘sequential linear sort’ algorithm is proposed for sorting in SKD. The proposed design achieves a throughput as high as 802Mbps with latency of 19.83ns.

      PubDate: 2017-04-02T00:52:02Z
      DOI: 10.1016/j.aeue.2017.03.020
      Issue No: Vol. 75 (2017)
       
  • Double span floating point representation scheme for the powers-of-two
           filter
    • Authors: Abhijit Chandra; Priya Kumari; Mouban Chakraborty; Utsab Sengupta
      Pages: 13 - 20
      Abstract: Publication date: April 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 74
      Author(s): Abhijit Chandra, Priya Kumari, Mouban Chakraborty, Utsab Sengupta
      The area of signal processing has been experiencing silent revolution over the last few years. A number of promising algorithms are being developed in this regard. In connection to this, minimization of hardware complexity of digital filter has grown sufficient interest amongst the research community. Hardware cost of digital filter may be reduced by encoding the filter coefficient in the form of sum of signed powers-of-two (SPT). This article introduces a new encoding strategy of the non-uniform powers-of-two coefficients for the sake of exploiting minimum hardware units. Proposed scheme targets to minimize the highest powers-of-two terms in any coefficient by judiciously dividing the ‘span’ part into two segments. As a matter of fact, it necessitates the use of minimum number of full-adder blocks during implementation as compared to other existing coefficient representation schemes. Supremacy of the proposed double span floating point (DSFP) representation technique has been mathematically substantiated and supported with the help of few design examples.

      PubDate: 2017-02-13T07:27:48Z
      DOI: 10.1016/j.aeue.2017.01.018
      Issue No: Vol. 74 (2017)
       
  • Network Failure Detection Based on Correlation Data Analysis
    • Authors: Piotr Zych
      Abstract: Publication date: Available online 22 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Piotr Zych
      For a telecommunication operator, the effective detection of access and aggregation network failures is the key to providing continuous service. Although there are many monitoring systems on the market, analysis has shown that there is no possibility of automatically detecting all failures using standard monitoring systems. In this article, an innovative option for failure detection is proposed, based on correlation analysis of data retrieved in real time from the network. A key source of data is the Remote Authentication Dial-in User Service (RADIUS) which records events giving information about auser’s Point-to-Point Protocol (PPP) session state sent to the monitoring system. It is shown here that the proposed solution enables an operator to detect all network events affecting customers. The detection of a greater number of events enables the operator to react quickly to them and to restore services to users as soon as possible, which ultimately improves the quality and continuity of provided services.

      PubDate: 2017-04-23T01:55:05Z
      DOI: 10.1016/j.aeue.2017.04.014
       
  • Optimization of Weighted Myriad Filters with Differential Evolution
           Algorithm
    • Authors: Hasan Zorlu
      Abstract: Publication date: Available online 21 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Hasan Zorlu
      Derivative-based algorithms, called classical algorithms, for optimization of weighted myriad (WMy) filters which are robust nonlinear filters in impulsive noisy environments are presented in literature. In this study, (WMy) filters that have various window lengths are optimized with differential evolution algorithm (DEA) that is known as a derivative-free based and evolutionary algorithm. The main contribution of this paper is to propose a novel strategy that is based on using the DEA in optimization of the parameters of nonlinear WMy filters. The results of proposed optimization studies are compared with a classical algorithm presented in literature. According to the simulation results; DEA has better performance than classical algorithm in optimization studies and also WMy filters optimized with DEA have ability of effectively suppressing the impulsive noisy environments.

      PubDate: 2017-04-23T01:55:05Z
      DOI: 10.1016/j.aeue.2017.04.020
       
  • Secrecy Outage of SWIPT in the Presence of Cooperating Eavesdroppers
    • Authors: Furqan Jameel; Shurjeel Wyne
      Abstract: Publication date: Available online 21 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Furqan Jameel, Shurjeel Wyne
      This work investigates the secrecy performance for a simultaneous wireless information and power transfer system that operates in the presence of cooperating eavesdroppers. The multi-antenna access point’s transmission is used for information-decoding by a multi-antenna node and for energy-harvesting (EH) by multiple single-antenna nodes. However, some of the nodes authorized for EH only attempt to eavesdrop on the ongoing information transmission by utilizing a generalized on-off power splitting architecture. We derive a closed-form expression for the secrecy outage probability of the considered Multiple-Input-Multiple-Output Multiple-Eavesdroppers system. Theoretical and simulation results are provided to validate the derived results.

      PubDate: 2017-04-23T01:55:05Z
      DOI: 10.1016/j.aeue.2017.04.017
       
  • Design of a Microstrip Diplexer with a Novel Structure for WiMAX and
           Wireless Applications
    • Authors: Leila Noori; Abbas Rezaei
      Abstract: Publication date: Available online 21 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Leila Noori, Abbas Rezaei
      In this paper, a novel combination of coupled lines, loops, step impedance and low impedance sections are used to design a compact microstrip diplexer. The designing method is based on obtaining transmission matrices and finding the effective parameters in tuning the resonance frequencies. T-shape tapped lines feed structures are added to three terminals of the proposed diplexer to decrease insertion losses at the both passbands without increasing the overall size. The proposed diplexer with a total size of 573.11mm2 operates at 2.6 GHz for IEEE 802.16 and 802.20 WiMAX technology and 6 GHz for wireless applications. The insertion losses at the lower and higher resonance frequencies are 0.6 dB and 0.9 dB, respectively. The proposed structure is simulated, fabricated and measured. The measurement results are in a good agreement with the simulations.
      Graphical abstract image

      PubDate: 2017-04-23T01:55:05Z
      DOI: 10.1016/j.aeue.2017.04.019
       
  • Outage Analysis of TAS/MRC in Dual Hop Full-Duplex MIMO Relay Networks
           with Co-channel Interferences
    • Authors: Mesut Toka; Oğuz Kucur
      Abstract: Publication date: Available online 21 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Mesut Toka, Oğuz Kucur
      In this paper, we investigate the outage performance of transmit antenna selection (TAS) and maximal-ratio combining (MRC) in dual hop full-duplex (FD) amplify-and-forward (AF) relay network over Rayleigh fading channels. In the analysis, Rayleigh faded multiple Co-channel interferers (CCIs) are also taken into account at the relay. In the network, source and destination are equipped with multiple antennas, and relay is equipped with one receive and one transmit antennas, respectively and source-destination link is not available. While the TAS is applied at the source without considering residual self-interference (RSI) effect, received signals at the destination are combined based on the MRC technique. For the analysis, we consider three approaches at the relay. In the first, we consider the received signal at the relay is corrupted by faded RSI and noise, in the second one, the RSI is considered as non-fading. In the last one, the noise is neglected. In all cases, the relay suffers from multiple Rayleigh faded CCIs. Outage probability (OP) expression related to all the cases is derived and obtained in single integral forms in case of the faded/non-fading RSI and in closed form in case of the noise neglected approach. Moreover, we also find asymptotic OPs and conduct effective diversity order analysis. The analytical results are verified by the Monte Carlo simulations. Results show that TAS decreases error floor at high signal-to-noise ratio (SNR) region and MRC provides diversity gain at low SNR region. In addition, approaches II and III are good approximations to approach I at low and high SNR regions, respectively.

      PubDate: 2017-04-23T01:55:05Z
      DOI: 10.1016/j.aeue.2017.04.010
       
  • A simple three–dimensional fractional–order chaotic system without
           equilibrium: Dynamics, circuitry implementation, chaos control and
           synchronization
    • Authors: Viet-Thanh Pham; Sifeu Takougang Kingni; Christos Volos; Sajad Jafari; Tomasz Kapitaniak
      Abstract: Publication date: Available online 20 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Viet-Thanh Pham, Sifeu Takougang Kingni, Christos Volos, Sajad Jafari, Tomasz Kapitaniak
      Chaotic systems without equilibrium points have been investigated and received significant attention recently. In this work, we propose a new three–dimensional fractional–order chaotic system without equilibrium. Dynamics of the fractional–order system are investigated and a circuit implementation of the system by using electronic components is presented. Interestingly, bistable chaotic attractors of such fractional system are discovered. In addition, we are able to control and synchronize the system by using active control and unidirectional coupling.

      PubDate: 2017-04-23T01:55:05Z
      DOI: 10.1016/j.aeue.2017.04.012
       
  • PAPR Analysis of Wavelet Based Multitaper GFDM System
    • Authors: Shravan Kumar; Bandari Venkata Mani Vakamulla Anastasios Drosopoulos
      Abstract: Publication date: Available online 14 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Shravan Kumar Bandari, Venkata Mani Vakamulla, Anastasios Drosopoulos
      To guarantee a reliable, accurate communication with reduced latency and increased throughput, one of the 5G candidates Generalized Frequency Division Multiplexing (GFDM) has emerged out. Due to the non-orthogonal nature of GFDM inherent Inter Symbol Interference (ISI), Inter Carrier Interference (ICI) and high Peak to Average Power Ratio (PAPR) may occur. In order to combat such effects prolate windows are incorporated as a prototype filter to design an improved orthogonal system which provides a robust multitaper GFDM (MGFDM) carrier technique for next generation wireless networks, which outperforms conventional GFDM in terms of PAPR. In this paper, we propose a novel wavelet based MGFDM (WM-GFDM) to further reduce the PAPR by considering various wavelet transforms such as Haar, Daubechies, symlets, coiflets, Biorthogonal, Reverse Biorthogonal and Discrete Meyer Wavelets. Here, the conventional Fourier Transforms as used in traditional systems was replaced with Wavelet Transforms. The results show that PAPR performance with wavelet implementation outperformed both conventional GFDM and MGFDM by several dB. In addition, symbol error rate (SER) of WM-GFDM in comparison with conventional GFDM, MGFDM and Orthogonal FDM (OFDM) is analyzed along with spectral comparison where the results suggest that WM-GFDM follows the steps of GFDM and MGFDM.

      PubDate: 2017-04-15T19:35:27Z
       
  • An Antipodal Vivaldi Antenna with Band-notched Characteristics for
           Ultra-Wideband Applications
    • Authors: Zhou Yang; Huang Jingjian weiwei Yuan Naichang
      Abstract: Publication date: Available online 13 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Zhou Yang, Huang Jingjian, Wu weiwei, Yuan Naichang
      An antipodal Vivaldi antenna (AVA) with band-notched characteristics is proposed in this paper for ultra-wideband (UWB) applications. For UWB systems, there will be some interference from the narrow band systems. The proposed antenna adopts resonant parallel strip (RPS) to reject an unwanted narrow band. It is easy to tune the RPS to eliminate the interference band. To validate this approach, a printed AVA with RPS is simulated and fabricated. From 2 to 9GHz, the proposed antenna shows a good result with approximate 2:1 VSWR, an average gain of 6.5dB, and stable radiation patterns except the notched band. At the center frequency of the notched band, the measured results show that the VSWR is more than 8:1, the realized gain is less than -10dB and a messy radiation pattern is achieved. The simulated and measured results are in good agreement.

      PubDate: 2017-04-15T19:35:27Z
       
  • Design of high speed and low power 4-bit comparator using FGMOS
    • Authors: Roshani Gupta; Rockey Gupta; Susheel Sharma
      Abstract: Publication date: Available online 12 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Roshani Gupta, Rockey Gupta, Susheel Sharma
      This paper presents a novel low power and high speed 4-bit comparator extendable to 64-bits using floating-gate MOSFET (FGMOS). Here, we have exploited the unique feature of FGMOS wherein the effective voltage at its floating-gate is the weighted sum of many input voltages which are capacitively coupled to the floating-gate. The performance of proposed 4-bit comparator circuit has been compared with other comparator circuits designed using CMOS, transmission gate (TG), pass transistor logic (PTL) and gate diffusion input (GDI) technique. The proposed FGMOS based 4-bit comparator have shown remarkable performance in terms of transistor count, speed, power dissipation and power delay product besides full swing at the output in comparison to the existing comparator designs available in literature. Thus the proposed circuit can be viable option for high speed and low power applications. The performance of the proposed FGMOS based 4-bit comparator has been verified through OrCAD PSpice simulations through circuit file/schematics using level 7 parameters obtained from TSMC in 0.13 μm technology with the supply voltage of 1 V.

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.004
       
  • Two-Stage Adaptive Estimation of Irrational Linear Systems
    • Authors: M.N. Kapetina; M.R. Rapaić; Z.D. Jeličić
      Abstract: Publication date: Available online 11 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): M.N. Kapetina, M.R. Rapaić, Z.D. Jeličić
      In the present paper, an adaptive parameter estimation algorithm applicable to linear systems with transfer functions of arbitrary structure is proposed. The approach can be applied to a wide class of linear processes, including non-linearly parameterized ones. The proposed method is applicable to fractional-order systems, distributed-parameter and delayed systems, and other classes of systems described by irrational transfer functions. In the first stage of the proposed procedure, values of the transfer function at specific frequencies are pinpointed by means of the Recursive Least Square algorithm with forgetting factor. In the second stage, the unknown parameters are found by numerically inverting complex non-linear relations linking them to the quantities estimated in the first stage. The inversion is performed by means of an iterative, gradient-based scheme. The method is illustrated by several detailedly explained numerical examples.

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.008
       
  • Noise-Robust Scream Detection using Band-limited Spectral Entropy
    • Authors: Noboru Hayasaka; Arata Kawamura; Naoto Sasaoka
      Abstract: Publication date: Available online 11 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Noboru Hayasaka, Arata Kawamura, Naoto Sasaoka
      This report describes scream detection systems that can detect screams under noisy conditions and describes techniques for increasing their noise-robustness. More specifically, spectral entropy, which expresses the difference in frequency distribution between a scream and noise, is used as a detection feature. Furthermore, a method is presented that improves scream detection accuracy in noisy environments by limiting the frequency band of the spectral entropy used as the detection feature. Evaluation experiments in noisy environments demonstrated that the proposed method has better scream detection capability than a conventional method. The proposed method can detect screams with equal error rates of 0.3 % and 0.8 % under 0 and - 5 dB conditions, respectively. Furthermore, the cost of likelihood calculation is about 1 / 12 th that of the conventional method. The proposed method can thus be used to develop a scream detection system that is sufficiently accurate in an actual environment.

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.002
       
  • Theory and Experiments on Horizontally Inhomogeneous Rectangular
           Dielectric Resonator Antenna
    • Authors: Sudipta Maity; Bhaskar Gupta
      Abstract: Publication date: Available online 11 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Sudipta Maity, Bhaskar Gupta
      A theoretical investigation on horizontally inhomogeneous Rectangular Dielectric Resonator Antenna (RDRA) is presented here using the mode matching technique. The inhomogeneous permittivity is introduced by placing two RDRA segments of different materials horizontally side by side. The fundamental TE 111 y mode is investigated here. Eigenfunction, eigenvalue, resonant frequency and far-field radiation patterns are presented. A closed form analytical expression is given here to predict the resonant frequency. Four antenna prototypes are fabricated and tested for experimental validation. It is found that our theoretical results are in good agreement with experimental data, published data as found in the open literature and data obtained using the 3D EM simulator. It is also found that Horizontally Inhomogeneous RDRA (HIRDRA) produces a peak in the broadside direction at fundamental TE 111 y mode. It is found that our theory gives results order faster (approx. 400-600 times) than commercially available 3D numerical EM simulator HFSS. The inhomogeneity introduces additional two degrees of freedom (width and permittivity of the additional dielectric segment) which give more flexibility to the antenna design, leading to wider tuning range over conventional RDRA. Advantages of this novel antenna structure are discussed in detail. This theory can easily be extended to investigate fractal shaped RDRAs, log-periodic antenna using RDRAs.

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.001
       
  • A FPGA-based digital synchronous methodology for IEC 61850-9-2 Process Bus
    • Authors: Zhiheng Liu; Xiongying Duan; Minfu Liao; Jiyan Zou
      Abstract: Publication date: Available online 9 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Zhiheng Liu, Xiongying Duan, Minfu Liao, Jiyan Zou
      In this paper, a network synchronization proposal for digital substation process bus in the process layer was designed. It appears differences of timing grouping queuing delay in the forward and backward on the channel due to the switch / routing device, thus introducing queue-induced asymmetry, which is a major contributor to time offset and time delay between master and subordinate clocks. The sampled value of the transmission time error caused by the electronic transformer (ECT) signal processing channel and Ethernet communication channel is analyzed. An FPGA-based (field-programmable gate array, FPGA) digital synchronization approach for merging unit (MU) was proposed, which included oversampling, linear phase-shifting, dynamic interpolation resampling technique. It solved the sampled value message precise synchronization problems on the IEC61850-9-2 process bus. Time offset and delay were reduced more than 70μs between the master and subordinate clocks based on IEEE 1588v2, and he test results were well in 0.2S level of IEC 60044 standard. Numerical examples are presented to demonstrate the effectiveness of the theoretical results.

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.006
       
  • Continuous-Time Signal Recovery from 1-bit Multiple Measurement Vectors
    • Authors: Lebing Pan; Shiliang Xiao; Baoqing Li; Xiaobing Yuan
      Abstract: Publication date: Available online 9 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Lebing Pan, Shiliang Xiao, Baoqing Li, Xiaobing Yuan
      In this letter, the 1-bit compressive sensing (CS) technology is utilized to recover joint sparse signal. In the context of multi-bits quantization, compared to the single measurement vector (SMV) case, the successful recovery rate can be significantly improved using multiple measurement vectors (MMV) model. Therefore, we introduce the MMV model for signal recovery from 1-bit sampling. Due to the amplitude information loss using 1-bit quantizing, a new sampling framework is proposed to estimate the ℓ 2 -norm of each measurement vector for continuous-time signal, followed by the corresponding estimation Algorithm 1-bit iterative hard thresholding (1-bit IHT). Then we develop the algorithm of binary IHT for MMV (M-BIHT) to recover joint sparse signal under uncertain noise. Compared to the 1-bit SMV model and multi-bits quantization MMV mode, the experimental results illustrate the recovery performance is improved greatly by the 1-bit MMV model.

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.005
       
  • Hardware trojans against virtual keyboards on E-banking platforms –
           A proof of concept
    • Authors: Pedro Peris-Lopez; Honorio Martin
      Abstract: Publication date: Available online 9 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Pedro Peris-Lopez, Honorio Martin
      In the last years there has been a considerable growth on the number of users in on-line banking [1]. Banks must implement strong security solutions and users have to feel safe about the security offered. To securize the users’ access, virtual keyboards are commonly used. Unlikely, virtual keyboards are vulnerable to shoulder surfing and malicious software-based attacks such as malware and Trojans [2,3]. In this article we propose a Hardware Trojan (HT), which targets a VGA display and is able to reveal the private information clicked by the user on a virtual keyboard. This HT is very harmful since it defeats the countermeasures (e.g., keyboard mutation or obfuscation) generally used to combat malicious pieces of software [4–6].

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.003
       
  • A Simple Transmit Diversity System for Fading Channels Using Shaped
           Sinusoidal functions
    • Authors: A.Y. Hassan
      Abstract: Publication date: Available online 6 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): A.Y. Hassan
      This paper proposes a transmit-diversity system using a pair of orthogonal pulses. The system uses a set of orthonormal-basic functions, which contains four shaped-sinusoidal pulses with the same frequency. The first two elements in the set are shaped sine and cosine pulses. The second two elements are the same sine and cosine pulses but they are shaped with the Hilbert transform of the shaping pulse of the first two elements. The modulator in the proposed system produces two modulated symbols for each data symbol. It uses the first two elements in the proposed set in modulating the first modulated symbol and the second two elements in modulating the second modulated symbol. The modulated symbols are transmitted though two antennas. The diversity order of the proposed system is twice the number of antennas in the receiver. In the proposed system, no space-time coding is used and the channel gains change every symbol period. This is different from the Multiple-Input-Multiple-Output (MIMO) system. The receiver of the proposed system consists of two matched filters for each receiving antenna. No special detectors or interference cancelation techniques are used because there is no interference between the outputs of the matched filters.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.024
       
  • Further Experimental Evidence of the Fractional-Order Energy Equation in
           Supercapacitors
    • Authors: Ahmed S. Elwakil; Anis Allagui; T.J. Freeborn; B.J. Maundy
      Abstract: Publication date: Available online 6 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Ahmed S. Elwakil, Anis Allagui, T.J. Freeborn, B.J. Maundy
      Due to the dispersive porous nature of its material, carbon-carbon supercapacitors have a current-voltage relationship which is modeled by a fractional-order differential equation of the form i ( t ) = C α d α v ( t ) dt α where α ≤ 1 is a dispersion coefficient and C α is a pseudo-capacitance not measurable in Farads. Hence, the energy stored in a capacitor, known to equal CV 2 / 2 where C is the capacitance in Farad and V is the voltage applied, does not apply to a supercapacitor. In a recent work [1], a fractional-order energy equation that enables the quantification of the energy stored in a supercapacitor when it is charged by a linear voltage ramp was derived. In addition, an effective capacitance (in proper Farad units) obtained from the time-domain analysis of the supercapacitor model under this type of charging was also derived. While some experimental results were given in [1], here we provide more experimental evidence of the applicability of the fractional-order energy equation using two commercial devices from two different vendors. We also show the effect of fast charging versus slow charging on the amount of energy stored in these supercapacitors.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.027
       
  • Emulation of an electrical-analogue of a fractional-order human
           respiratory mechanical impedance model using OTA topologies
    • Authors: Costas Vastarouchas; Georgia Tsirimokou; Todd J. Freeborn; Costas Psychalinos
      Abstract: Publication date: Available online 2 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Costas Vastarouchas, Georgia Tsirimokou, Todd J. Freeborn, Costas Psychalinos
      In this work, an electrical-analogue of a fractional-order mechanical impedance model used to represent the human respiratory system is emulated using approximated fractional-order capacitors and inductors. These approximated fractional-order elements are realized using differentiator/integrator blocks and appropriately configured Operational Transconductance Amplifiers. The accuracy and emulated frequency-band have been increased compared to previous emulation schemes by employing a 3rd-order approximation of s α in the realization. Post-layout simulation results from 4 Hz to 48 Hz confirm that the fractional-order respiratory impedance model has less than 5 % error compared to their theoretical results in this frequency range.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.021
       
  • Editorial board members
    • Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75


      PubDate: 2017-04-08T19:12:20Z
       
  • Editorial board members
    • Abstract: Publication date: May 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 75


      PubDate: 2017-04-08T19:12:20Z
       
  • Editorial board members
    • Abstract: Publication date: April 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 74


      PubDate: 2017-03-18T13:34:21Z
       
  • Editorial board members
    • Abstract: Publication date: April 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 74


      PubDate: 2017-03-18T13:34:21Z
       
  • Robust adaptive beamforming using multi-snapshot direct data domain
           approach
    • Authors: Lilong Qin; Manqing Wu; Zhen Dong
      Abstract: Publication date: Available online 14 March 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Lilong Qin, Manqing Wu, Zhen Dong
      For the realistic case where there is no secondary snapshot that does not contain the desired signal and exhibits the statistical characteristics similar to the snapshot under test, direct data domain (D3) beamforming approaches have been proposed to estimate a desired signal in the presence of interference. However, the basic idea of the D3 methods is realized by making significant sacrifices with respect to the number of degrees of freedom (DoFs). In this paper, we present a multi-snapshot approach for D3 beamforming. Using the least-squares method with multiple snapshots, we can eliminate the interference without causing a severe reduction in the number of DoFs. In addition, to consider a mismatch between nominal and actual target steering vectors, we propose a D3 approach combined with a probability constraint to prevent the self-nulling effect, and the relationship between the probability constraint and norm constraint is discovered. The simulations verify that the proposed method provides better performance and robustness than the conventional D3 approaches.

      PubDate: 2017-03-18T13:34:21Z
      DOI: 10.1016/j.aeue.2017.03.004
       
 
 
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