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Publisher: Elsevier   (Total: 3168 journals)

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Showing 1 - 200 of 3168 Journals sorted alphabetically
Academic Pediatrics     Hybrid Journal   (Followers: 39, SJR: 1.655, CiteScore: 2)
Academic Radiology     Hybrid Journal   (Followers: 26, SJR: 1.015, CiteScore: 2)
Accident Analysis & Prevention     Partially Free   (Followers: 105, SJR: 1.462, CiteScore: 3)
Accounting Forum     Hybrid Journal   (Followers: 28, SJR: 0.932, CiteScore: 2)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 42, SJR: 1.771, CiteScore: 3)
Achievements in the Life Sciences     Open Access   (Followers: 7)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 6)
Acta Astronautica     Hybrid Journal   (Followers: 453, SJR: 0.758, CiteScore: 2)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Biomaterialia     Hybrid Journal   (Followers: 30, SJR: 1.967, CiteScore: 7)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 3)
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 11, SJR: 0.18, CiteScore: 1)
Acta Histochemica     Hybrid Journal   (Followers: 5, SJR: 0.661, CiteScore: 2)
Acta Materialia     Hybrid Journal   (Followers: 330, SJR: 3.263, CiteScore: 6)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.504, CiteScore: 1)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.542, CiteScore: 1)
Acta Oecologica     Hybrid Journal   (Followers: 12, SJR: 0.834, CiteScore: 2)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription  
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 2, SJR: 0.307, CiteScore: 0)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2, SJR: 1.793, CiteScore: 6)
Acta Poética     Open Access   (Followers: 4, SJR: 0.101, CiteScore: 0)
Acta Psychologica     Hybrid Journal   (Followers: 26, SJR: 1.331, CiteScore: 2)
Acta Sociológica     Open Access   (Followers: 1)
Acta Tropica     Hybrid Journal   (Followers: 7, SJR: 1.052, CiteScore: 2)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 3, SJR: 0.374, CiteScore: 1)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 2)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 3, SJR: 0.344, CiteScore: 1)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 1)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 7, SJR: 0.19, CiteScore: 0)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 3)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 8)
Acute Pain     Full-text available via subscription   (Followers: 15, SJR: 2.671, CiteScore: 5)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.53, CiteScore: 4)
Addictive Behaviors     Hybrid Journal   (Followers: 18, SJR: 1.29, CiteScore: 3)
Addictive Behaviors Reports     Open Access   (Followers: 9, SJR: 0.755, CiteScore: 2)
Additive Manufacturing     Hybrid Journal   (Followers: 13, SJR: 2.611, CiteScore: 8)
Additives for Polymers     Full-text available via subscription   (Followers: 23)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 196, SJR: 4.09, CiteScore: 13)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 12, SJR: 1.167, CiteScore: 4)
Advanced Powder Technology     Hybrid Journal   (Followers: 17, SJR: 0.694, CiteScore: 3)
Advances in Accounting     Hybrid Journal   (Followers: 9, SJR: 0.277, CiteScore: 1)
Advances in Agronomy     Full-text available via subscription   (Followers: 17, SJR: 2.384, CiteScore: 5)
Advances in Anesthesia     Full-text available via subscription   (Followers: 30, SJR: 0.126, CiteScore: 0)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 12, SJR: 0.992, CiteScore: 1)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 12, SJR: 1.551, CiteScore: 4)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 24, SJR: 2.089, CiteScore: 5)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 15, SJR: 0.572, CiteScore: 2)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.61, CiteScore: 7)
Advances in Botanical Research     Full-text available via subscription   (Followers: 1, SJR: 0.686, CiteScore: 2)
Advances in Cancer Research     Full-text available via subscription   (Followers: 35, SJR: 3.043, CiteScore: 6)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 1.453, CiteScore: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 1.992, CiteScore: 5)
Advances in Cell Aging and Gerontology     Full-text available via subscription   (Followers: 5)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 14)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 29, SJR: 0.156, CiteScore: 1)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 11, SJR: 0.713, CiteScore: 1)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 11, SJR: 1.316, CiteScore: 2)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 26, SJR: 1.562, CiteScore: 3)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 20, SJR: 1.977, CiteScore: 8)
Advances in Computers     Full-text available via subscription   (Followers: 14, SJR: 0.205, CiteScore: 1)
Advances in Dermatology     Full-text available via subscription   (Followers: 16)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 13)
Advances in Digestive Medicine     Open Access   (Followers: 12)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 7)
Advances in Drug Research     Full-text available via subscription   (Followers: 26)
Advances in Ecological Research     Full-text available via subscription   (Followers: 44, SJR: 2.524, CiteScore: 4)
Advances in Engineering Software     Hybrid Journal   (Followers: 29, SJR: 1.159, CiteScore: 4)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 8)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 52, SJR: 5.39, CiteScore: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 1)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 67, SJR: 0.591, CiteScore: 2)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 17)
Advances in Genetics     Full-text available via subscription   (Followers: 21, SJR: 1.354, CiteScore: 4)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11, SJR: 12.74, CiteScore: 13)
Advances in Geophysics     Full-text available via subscription   (Followers: 7, SJR: 1.193, CiteScore: 3)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 26, SJR: 0.368, CiteScore: 1)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11, SJR: 0.749, CiteScore: 3)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 26)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 3, SJR: 0.193, CiteScore: 0)
Advances in Immunology     Full-text available via subscription   (Followers: 37, SJR: 4.433, CiteScore: 6)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 10, SJR: 1.163, CiteScore: 2)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 2, SJR: 1.938, CiteScore: 3)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 6, SJR: 0.176, CiteScore: 0)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 3)
Advances in Life Course Research     Hybrid Journal   (Followers: 9, SJR: 0.682, CiteScore: 2)
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: 21, SJR: 0.88, CiteScore: 2)
Advances in Mathematics     Full-text available via subscription   (Followers: 15, SJR: 3.027, CiteScore: 2)
Advances in Medical Sciences     Hybrid Journal   (Followers: 9, SJR: 0.694, CiteScore: 2)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 5, SJR: 1.158, CiteScore: 3)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 25)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 8)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.182, CiteScore: 0)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 5)
Advances in Oncobiology     Full-text available via subscription   (Followers: 2)
Advances in Organ Biology     Full-text available via subscription   (Followers: 2)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18, SJR: 1.875, CiteScore: 4)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.174, CiteScore: 0)
Advances in Parasitology     Full-text available via subscription   (Followers: 5, SJR: 1.579, CiteScore: 4)
Advances in Pediatrics     Full-text available via subscription   (Followers: 27, SJR: 0.461, CiteScore: 1)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 19)
Advances in Pharmacology     Full-text available via subscription   (Followers: 17, SJR: 1.536, CiteScore: 3)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 0.574, CiteScore: 1)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.109, CiteScore: 1)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 11)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 6)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20, SJR: 0.791, CiteScore: 2)
Advances in Psychology     Full-text available via subscription   (Followers: 68)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6, SJR: 0.371, CiteScore: 1)
Advances in Radiation Oncology     Open Access   (Followers: 3, SJR: 0.263, CiteScore: 1)
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.101, CiteScore: 0)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 6)
Advances in Space Research     Full-text available via subscription   (Followers: 435, SJR: 0.569, CiteScore: 2)
Advances in Structural Biology     Full-text available via subscription   (Followers: 5)
Advances in Surgery     Full-text available via subscription   (Followers: 13, SJR: 0.555, CiteScore: 2)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 37, SJR: 2.208, CiteScore: 4)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 20)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 15)
Advances in Virus Research     Full-text available via subscription   (Followers: 6, SJR: 2.262, CiteScore: 5)
Advances in Water Resources     Hybrid Journal   (Followers: 55, SJR: 1.551, CiteScore: 3)
Aeolian Research     Hybrid Journal   (Followers: 6, SJR: 1.117, CiteScore: 3)
Aerospace Science and Technology     Hybrid Journal   (Followers: 395, SJR: 0.796, CiteScore: 3)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.42, CiteScore: 2)
African J. of Emergency Medicine     Open Access   (Followers: 6, SJR: 0.296, CiteScore: 0)
Ageing Research Reviews     Hybrid Journal   (Followers: 12, SJR: 3.671, CiteScore: 9)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 489, SJR: 1.238, CiteScore: 3)
Agri Gene     Hybrid Journal   (Followers: 1, SJR: 0.13, CiteScore: 0)
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 18, SJR: 1.818, CiteScore: 5)
Agricultural Systems     Hybrid Journal   (Followers: 32, SJR: 1.156, CiteScore: 4)
Agricultural Water Management     Hybrid Journal   (Followers: 45, SJR: 1.272, CiteScore: 3)
Agriculture and Agricultural Science Procedia     Open Access   (Followers: 4)
Agriculture and Natural Resources     Open Access   (Followers: 3)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 58, SJR: 1.747, CiteScore: 4)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.589, CiteScore: 3)
Air Medical J.     Hybrid Journal   (Followers: 8, SJR: 0.26, CiteScore: 0)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.19, CiteScore: 0)
Alcohol     Hybrid Journal   (Followers: 12, SJR: 1.153, CiteScore: 3)
Alcoholism and Drug Addiction     Open Access   (Followers: 12)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 2, SJR: 0.604, CiteScore: 3)
Alexandria J. of Medicine     Open Access   (Followers: 1, SJR: 0.191, CiteScore: 1)
Algal Research     Partially Free   (Followers: 11, SJR: 1.142, CiteScore: 4)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.504, CiteScore: 1)
Allergology Intl.     Open Access   (Followers: 5, SJR: 1.148, CiteScore: 2)
Alpha Omegan     Full-text available via subscription   (SJR: 3.521, CiteScore: 6)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 11, SJR: 0.201, CiteScore: 1)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 54, SJR: 4.66, CiteScore: 10)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 6, SJR: 1.796, CiteScore: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 6, SJR: 1.108, CiteScore: 3)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 5)
American Heart J.     Hybrid Journal   (Followers: 58, SJR: 3.267, CiteScore: 4)
American J. of Cardiology     Hybrid Journal   (Followers: 67, SJR: 1.93, CiteScore: 3)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 47, SJR: 0.604, CiteScore: 1)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 13)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.524, CiteScore: 3)
American J. of Human Genetics     Hybrid Journal   (Followers: 37, SJR: 7.45, CiteScore: 8)
American J. of Infection Control     Hybrid Journal   (Followers: 29, SJR: 1.062, CiteScore: 2)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 37, SJR: 2.973, CiteScore: 4)
American J. of Medicine     Hybrid Journal   (Followers: 50)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3, SJR: 1.967, CiteScore: 2)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 277, SJR: 2.7, CiteScore: 4)
American J. of Ophthalmology     Hybrid Journal   (Followers: 66, SJR: 3.184, CiteScore: 4)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 5, SJR: 0.265, CiteScore: 0)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.289, CiteScore: 1)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, CiteScore: 1)
American J. of Pathology     Hybrid Journal   (Followers: 32, SJR: 2.139, CiteScore: 4)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 28, SJR: 2.164, CiteScore: 4)
American J. of Surgery     Hybrid Journal   (Followers: 39, SJR: 1.141, CiteScore: 2)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.767, CiteScore: 1)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 7)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.144, CiteScore: 3)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 67, SJR: 0.138, CiteScore: 0)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 25, SJR: 0.411, CiteScore: 1)
Anales de Cirugia Vascular     Full-text available via subscription   (Followers: 1)
Anales de Pediatría     Full-text available via subscription   (Followers: 3, SJR: 0.277, CiteScore: 0)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription  
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 5, SJR: 4.849, CiteScore: 10)
Analytica Chimica Acta     Hybrid Journal   (Followers: 44, SJR: 1.512, CiteScore: 5)
Analytica Chimica Acta : X     Open Access  
Analytical Biochemistry     Hybrid Journal   (Followers: 221, SJR: 0.633, CiteScore: 2)
Analytical Chemistry Research     Open Access   (Followers: 13, SJR: 0.411, CiteScore: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 14)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 2)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 25, SJR: 0.683, CiteScore: 2)
Angiología     Full-text available via subscription   (SJR: 0.121, CiteScore: 0)
Angiologia e Cirurgia Vascular     Open Access   (Followers: 1, SJR: 0.111, CiteScore: 0)
Animal Behaviour     Hybrid Journal   (Followers: 233, SJR: 1.58, CiteScore: 3)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 7, SJR: 0.937, CiteScore: 2)
Animal Reproduction Science     Hybrid Journal   (Followers: 7, SJR: 0.704, CiteScore: 2)

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Similar Journals
Journal Cover
AEU - International Journal of Electronics and Communications
Journal Prestige (SJR): 0.42
Citation Impact (citeScore): 2
Number of Followers: 8  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1434-8411
Published by Elsevier Homepage  [3168 journals]
  • An Area-Efficient Bit-Serial Sequential Polynomial Basis Finite Field
           GF(2 m ) Multiplier
    • Abstract: Publication date: Available online 29 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Siva Ramakrishna Pillutla, Lakshmi BoppanaAbstractMany cryptographic and error control coding algorithms rely on finite field arithmetic. Hardware implementation of these algorithms requires an efficient realization of finite field GF(2m) arithmetic operations. Finite field multiplication is complex among the basic arithmetic operations, and it is employed in field exponentiation and inversion operations. Various algorithms and architectures are proposed in the literature for hardware implementation of finite field multiplication to achieve a reduction in area and delay. In this paper, a modified interleaved modular reduction multiplication algorithm and its bit-serial sequential architecture are proposed. It is observed from the comparison of analytical results that the proposed architecture achieves the reduction in area and area-delay product compared to the existing multipliers. The proposed multiplier achieves an improvement of 39% in area and 17% in area-delay product estimations for field order of 409 when compared with the best sequential multiplier available in the literature. Application specific integrated circuit (ASIC) implementation of the proposed multiplier together with the two most comparable multipliers confirms that the proposed multiplier outperforms in terms of area and area-delay product. The proposed multiplier is suitable for implementation of security in Internet of Things (IoT) gateways and edge-devices.
       
  • Farrow Structure Based FIR Filter Design Using Hybrid Optimization
    • Abstract: Publication date: Available online 27 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): K. Srivatsan, Nithya VenkatesanAbstractFarrow structure is an effective structure for designing the digital filters in order to lease the complexity associated with the design. Keeping in mind, the effective and simple design of the digital filters, a method is proposed based on the Farrow structure. The proposed digital FIR filter is designed based on the farrow structure along with hybrid optimization that is designed using the Brain Storm Optimization(BSO) and Artificial Bee Colony(ABC) algorithm, termed as Brain Storm- Artificial Bee Colony (BSABC) algorithm. The proposed algorithm works based on the minimum objective function that depends on the total number of the hardware components especially adders/subtractors employed for the filter design and frequency response. The proposed algorithm operates in such a way that the quality of the filter is sustained with less number of hardware components. The optimal tuning using the proposed algorithm is simulated and analyzed for highlighting the effective method. The analysis is progressed in terms of the number of components employed in the design, fitness, Mean Absolute Error (MAE), and magnitude. The result of the analysis proves that the proposed method is effective over the Least-Square method with the minimum hardware components of 236 with minimum MAE of 0.02.
       
  • A Very Compact and Closely Spaced Circular Shaped UWB MIMO Antenna with
           Improved Isolation
    • Abstract: Publication date: Available online 27 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Tathababu Addepalli, V.R. AnithaAbstractA very compact and closely spaced circular-shaped UWB - MIMO antenna with slotted T-shaped stubs and protruded strips for high isolation is discussed in the present paper. The fractional bandwidth of the proposed model reaches 134.68% from 2.82 GHz to 14.45 GHz with S11
       
  • Pixelwise Improvised Blend of Predictors in HEVC Lossless Mode
    • Abstract: Publication date: Available online 27 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): S. Shilpa Kamath, P. Aparna, Antony AbhilashAbstractThe commendable work by the two video coding pioneers ISO/IEC and ITU-T, to handle the next-generation of multimedia services has led to the evolution of High-Efficiency Video Coding (HEVC) standard. The lossless mode of HEVC is essential when no loss in fidelity is desired to aide most of the real-world applications like video analytics, web collaboration, remote desktop sharing, etc. The proposed work intends to improvise the HEVC intra prediction scheme through the application of the heuristic history-based blend of predefined sub-predictors, while in lossless mode. The prime element of the locally adaptive mechanism is the derivation of the penalizing factors that are imposed on the sub-predictors, based on the neighborhood residuals. The experimental analysis highlights that the proposed method outperforms the lossless mode of HEVC anchor and the prevalent state-of-the-art prediction techniques in terms of savings in bit-rate which is achieved without any increase in run-time.
       
  • Finite-length performance comparison of network codes using random vs
           Pascal matrices
    • Abstract: Publication date: Available online 26 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Tan Do-Duy, Maria Ángeles Vázquez-CastroAbstractIn this letter, we evaluate the finite-length performance of network coding when using either random or structured encoding matrices. First, we present our novel construction of structured network codes over Fq (q=2m) using Pascal matrices. We present their encoding, re-encoding and decoding in matrix notation and derive their packet loss rate. Second, we propose a novel methodology to compute the optimal finite-length coding rate for representative and realistic traffic applications. Finally, our method allows to compare the performance of our codes with the performance of popular random codes. We show that our constructions always have better throughput and minimal overhead, which is more significant for short code lengths. Further, their larger decoding delay fulfils the delay constraints of realistic scenarios (e.g. 5G multihop networks).
       
  • Asymmetric Transversal Patch Loaded Microstrip Line Based 1-D Periodic
           Structure with Flexible Selection of Stopband Resonance
    • Abstract: Publication date: Available online 25 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Irfan Shahid, Dushmantha N. Thalakotuna, Debabrata K. Karmokar, Michael HeimlichAbstractA reactively loaded microstrip line based 1-D periodic structure is discussed. An off-centered via configuration is introduced to the conventional center-shorted square patch mushroom type electromagnetic bandgap (EBG) structures. In this work, a rectangular transversal patch is used to load a longitudinal microstrip line reactively. Reactive loading is varied by changing the via position away from the patch center while keeping all other structure parameters constant. This asymmetric loading causes the structure to exhibit EBG characteristics at much lower frequency with the same structure dimensions when compared to conventional centered via setup. Propagating modes are investigated using eigenmode dispersion analysis for different via positions. An equivalent circuit model of the proposed unit cell is developed. Transmission matrix (ABCD) based phase constant calculations for the circuit model agrees with the dispersion analysis results. Finally, experimental results confirm that the proposed asymmetric configuration allows the structure to lower the bandgap resonance by 28.6% with negligible impact on other performance attributes of the structure. Using the proposed configuration, compact filter structures can be designed where the stopband resonance can be flexibly placed in the band of interest within a wide frequency range, by optimizing the via position.
       
  • A Buck Converter Based On Dual Mode Asynchronous Pulse Width Modulator
    • Abstract: Publication date: Available online 23 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Reza Inanlou, Reza Shokri, Omid Shoaei, Andrea BaschirottoAbstractThis paper presents a buck type DC-DC converter based on an asynchronous pulse width modulator (APWM). The proposed APWM is a self-oscillating circuitry which is composed of a binary comparator (BAPWM) and a distinctive digitally controlled delay cell. The oscillating frequency of the BAPWM can be tuned by the delay of the modulator loop. By increasing the delay of the modulator loop, the switching frequency decreases and the BAPWM can be reconfigured as a low frequency APWM (LFAPWM) modulator to meet the efficiency requirement at light loads. Also, to save the switching power consumption the high-side power switch size is scaled according to the load conditions. Since the carrier signal is internally generated by the APWM itself, there is no major concern about the ramp signal discontinuity which is make duty cycle disturbance. In addition to, from the point of view of the output spectrum, the proposed converter provides a better performance compared to the conventional PWM (CPWM) and PFM due to its noise shaping property. The proposed converter is designed and simulated in a 0.13-µm CMOS technology to convert an input voltage of 5 V to the output voltage of 2.5 V with the maximum load current of 1 A. The conversion efficiency with full loading range for the 2.5 V output voltage is higher than 85% whereas the peak efficiency is about 92%.
       
  • Wideband Circularly Polarized Parasitic Patches Loaded Coplanar
           Waveguide-Fed Square Slot Antenna with Grounded Strips and Slots for
           Wireless Communication Systems
    • Abstract: Publication date: Available online 23 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Rashmi, Ashok Kumar, Kapil Saraswat, Arjun KumarAbstractIn this paper, the design, implementation, and experimental validation of a wideband circularly polarized square slot antenna (CPSSA) is presented. The proposed antenna comprises of an irregular square patch, asymmetrical grounded-L strips, an inverted-L grounded slot, a parasitic asymmetrical rectangular split ring resonator (RSRR) and inverted-L strip patches with the overall size of 0.305λL×0.305λL×0.007λL. By appropriately embedding strips, slots and parasitic patches on the antenna structure, the measured wideband 3-dB axial ratio bandwidth (ARBW) of 83.2% (2.33 – 5.65 GHz) is obtained, while the measured impedance bandwidth (IBW) of 86.72% (2.165 – 5.48 GHz) is achieved. Overall, CP bandwidth is 80.66%. A parametric study of different design parameters is investigated, and the overall performance of the antenna is presented.
       
  • Tunable bandpass filter with wide tuning range of center frequency and
           bandwidth based on circular SIW
    • Abstract: Publication date: Available online 21 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Xian Wang, Dewei Zhang, Qing Liu, Hailin Deng, Dalong LvAbstractThis paper presents a circular substrate integrated waveguide (SIW) bandpass filter (BPF) with wide tuning range of center frequency and bandwidth (BW). For designing such a filter, lumped varactors loaded at two metal posts are utilized to adjust the center frequency, and the bandwidth is tuned by varactors mounted between two SIW cavities. One transmission zero (TZ) can be located at the lower or upper stopband by controlling the mixed coupling between two resonators. The external coupling is changed by using two lumped varactors mounted between feedlines and resonators. Eventually, the BPF with tunable center frequency and bandwidth is designed, fabricated and measured. Measured results indicate the center frequency is tuned from 1.48-2.61 GHz (up to 55.3%) while maintaining a 3-dB absolute BW of 31 ± 2 MHz, and the 3-dB bandwidth is tuned from 29-250 MHz (up to 8.6). Insertion loss from 1.8-4.8 dB is observed within the wide tuning range.
       
  • Compact Quasi-Elliptical-Self-Complementary Four-Port Super-Wideband MIMO
           Antenna with Dual Band Elimination Characteristics
    • Abstract: Publication date: Available online 21 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Dinesh Kumar Raheja, Sachin Kumar, Binod Kumar KanaujiaAbstractIn this paper, a compact coplanar waveguide (CPW)-fed quasi-elliptical-self-complementary antenna (QESCA) exhibiting super-wideband (SWB) characteristics with dual-band notches for four-port multiple-input-multiple-output (MIMO) systems is presented. In order to achieve better inter-element isolation and polarization diversity, the four radiating elements of the MIMO antenna are placed orthogonal to each other. Each MIMO antenna element has an elliptical shape conductor patch and a slot, which is a complement of similar shape, both present on the same side of the substrate. At each port, the proposed antenna shows excellent SWB characteristics (1.25–40 GHz), providing a bandwidth ratio of 32:1. Further, two independent slits are loaded on each antenna element to reject Wi-MAX (3.5 GHz) and WLAN (5.5 GHz) bands from SWB. Inter-element isolation of more than 18 dB up to 15 GHz and over 25 dB in the higher frequency range is obtained. Measured parameters of the fabricated MIMO antenna prototype are in good agreement with the simulated results.
       
  • All-Digital Background Calibration of Gain and Timing Mismatches in
           Time-Interleaved ADCs Using Adaptive Noise Canceller
    • Abstract: Publication date: Available online 18 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Han Le Duc, Thi Kim Phuong Dinh, Van-Phuc Hoang, Duc Minh NguyenAbstractThis paper proposes a novel all-digital background calibration technique for gain and timing mismatches in Time-Interleaved Analog-to-Digital Converters (TIADCs) using adaptive noise canceller (ANC). The error signals due to the gain and timing mismatches are expressed in linear regression terms, producing the estimation problem of ANC. The gain and clock skew coefficients are estimated by maximizing the output signal-to-noise ratio in ANC system. The correction is simple by subtracting the re-constructed errors from the TIADC output. The proposed calibration technique eliminates the input spectrum constants as well as removes high-pass filters, which are required in the conventional free-band based calibration technique. In order to validate the proposed approach, simulations are carried out for an 11-bit, 2.7GS/s four-channel TIADC for various input signals. Results show that the proposed calibration produces excellent performance in terms of mismatch distortion suppression. It achieves the SNDR and SFDR improvement of 19dB and 49dB, respectively. Moreover, the synthesized design with hardware co-simulation on Xilinx Kintex-7 field-programmable gate array (FPGA) platform consumes only 7.36% of the hardware resources of the FPGA chip and reduces the mismatch tone level up to -87dB.
       
  • Performance Analysis at Far and Near User in NOMA Based System in Presence
           of SIC Error
    • Abstract: Publication date: Available online 17 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Monika Jain, Sandhya Soni, Nikhil Sharma, Divyang RawalAbstractNon-orthogonal multiple access (NOMA) scheme is an emerging 5G technology to improve upon the spectral efficiency. It can support more users than the number of available frequency-,time-, and code-domain resources. The innovation behind NOMA technology is to exploit non-orthogonal resource allocation at the cost of receiver complexity to mitigate the inter-user interference arising due to non-orthogonal signals. In this paper, we present performance analysis of downlink NOMA (DL-NOMA) system in presence of successive interference cancellation (SIC) error over Rayleigh fading channels. In particular, we derive the exact closed-form expressions of bit error rate (BER) at near-user (U1) and far-user (U2) for the considered DL-NOMA system. Besides, we also present the achievable rate analysis of the considered NOMA system and it is observed that its achievable rate is higher as compared to conventional orthogonal multiple access (OMA) schemes. Further, we also determine the optimized power allocation coefficient for the NOMA system. The analytical results are corroborated with the Monte-Carlo simulations. The simulation results are presented for different modulation schemes and for different NOMA scenarios. A close argument between the analytical and simulation results validate our analysis.
       
  • Clustering Formation in Cognitive Radio Networks Using Machine Learning
    • Abstract: Publication date: Available online 16 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Dost Muhammad Saqib Bhatti, Saleem Ahmed, Abdul Sattar Chan, Kashif SaleemAbstractThe goal of spectrum sensing is to elevate the detection performance of secondary users (SUs) in a cognitive radio network (CRN). In cooperative spectrum sensing, all secondary users (SUs) of the network deliver their sensing measurement to the fusion center (FC) for the final decision regarding the activity of primary user (PU). The collaboration among large number of SUs might create overhead for the FC. To improve the performance of cooperative spectrum sensing, a novel method is proposed, which segregates the network into clusters. We have used artificial intelligence to make the clusters. The formation of clusters is made based on machine learning affinity propagation algorithm. Using proposed method, SUs share local messages with their neighbors until a highest class of cluster heads are chosen and a corresponding clustering configuration is made. The messages are evaluated depend on measures of similarity between the SUs, which are selected based on the objective of the clustering process. The sensing message of delimited number of SUs is shared with their cluster heads, which is ultimately shared with the FC for final decision. The proposed approach obtains the highest energy and performance efficiency in comparison with conventional clustering schemes.
       
  • A Reconfigurable Highly-Linear CMOS Transceiver Core Chip for X-Band
           Phased Arrays
    • Abstract: Publication date: Available online 15 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Meghdadi Masoud, Lotfi Hadi, Medi AliAbstractThis paper presents a highly-linear transceiver core chip for X-band phased-array systems with two RX and one TX channels. Implemented in a standard 0.18-μm CMOS technology, the core chip provides 6-bit phase control (with rms error
       
  • An Ultra-Compact Two-Port UWB-MIMO Antenna with Dual Band-Notched
           Characteristics
    • Abstract: Publication date: Available online 14 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Amit Kumar, Abdul Quaiyum Ansari, Binod Kumar Kanaujia, Jugul Kishor, Sachin KumarAbstractIn this paper, an ultra-compact two-port MIMO antenna working in the frequency range of 3.1–10.6 GHz with dual band-notched characteristics is presented. The MIMO antenna consists of two identical octagonal-shaped radiating elements placed adjacent to each other with a connected ground plane. The overall size of the proposed two-port UWB-MIMO antenna is 19×30×0.8 mm3. In the ground plane of antenna elements, a T-shaped stub is introduced to create band-notch at 5.5 GHz. Also, an open-ended half-guided-wavelength resonator slot is introduced along the upper edge of the octagonal radiator to obtain a broader notched-band (4.37–5.95 GHz). The second band-notch is created around 7 GHz (6.52–7.45 GHz) by etching another open-ended slot from the radiating patch. The two-notch bands reject interference due to HiperLAN, WiMAX, INSAT/Super-extended C-band, downlink of X-band satellite communication and RFID service bands. A pair of L-shaped slits are introduced in the feed line to improve impedance matching, for the frequency band available between the two notches. The proposed design is fabricated on an FR-4 substrate and minimum isolation greater than 18 dB (a major portion>22 dB) and envelope correlation coefficient (ECC) less than 0.13 are obtained. The antenna gain varies in the range of 1.2–2.91 dBi with a variation of 1.71 dBi only. A radiation efficiency, greater than 70% is achieved throughout the operating frequency band.
       
  • A 2.24-pJ/bit 2.5-Gb/s UWB Receiver in 28-nm FDSOI CMOS for Low-Energy
           Chip-to-Chip Communications
    • Abstract: Publication date: Available online 13 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Cecilia Gimeno, Denis Flandre, Maxime Schramme, Charlotte Frenkel, David BolAbstractChip-to-chip communications in high-performance applications such as server racks rely on wireline serial links. In this paper, we present a compact ultra-wideband receiver front-end in 28-nm FDSOI CMOS technology as a wireless interconnect alternative for low-energy and broadcast communications. It is based on binary pulse position modulation without guard interval using two periods of a 10-GHz carrier to reach 2.5-Gb/s datarate over distances> 20 cm. The proposed receiver occupies 0.3 mm2 (including decoupling capacitors) and consumes only 5.6 mW which results in an energy of 2.24 pJ/bit.
       
  • Air-to-Ground 3D Channel Modeling for UAV Based on Gauss-Markov Mobile
           Model
    • Abstract: Publication date: Available online 12 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Yapu Li, Weimin Wang, Huaqiang Gao, Yongle Wu, Ming Su, Jingchao Wang, Yuanan LiuAbstractAir-to-ground (A2G) communication has been attracted great attention due to the gradual popularization of unmanned aerial vehicle (UAV). In this paper, a 3D geometry-based stochastic model (GBSM) for A2G channels is proposed. Meanwhile, the Gauss-Markov mobile model is adopted to generate dynamic trajectories. According to different scattering environments, we establish a reference model and a statistical simulation model for A2G channels, and derive their respective time correlation functions. In particular, the purpose of establishing the statistical simulation model is to reduce complexity, and we verify the consistency of the two models. Then, we analyze the dynamic motion scenarios generated by Gauss-Markov process, and their effects on A2G channel correlation. Finally, the good conformities of time correlation curves with the existing measurement data and sphere model verify the reliability of our proposed models.
       
  • Performance Enhancement of Dielectric Resonator Antenna by Using
           Cross-resonator Based Filtering Feed-Network
    • Abstract: Publication date: Available online 11 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Suparna Ballav, Susanta Kumar ParuiAbstractA wideband filtering dielectric resonator antenna (DRA) is demonstrated in this paper. The filtering characteristics is obtained by integrating a triple pole cross-resonator filter in the feed line of the slot coupled rectangular DRA. The transmission poles of the resonator are adjusted in order to get the wideband filtering response. The proposed filtering DRA offers an impedance bandwidth of 15% from 3.06 GHz to 3.56 GHz. Electric field distribution of DRA within the passband confirmed that the rectangular DRA drives in TE111 mode which ensured the broadside radiation. A satisfactory stable gain pattern of 5.9±0.3 dBi within the pass-band has been achieved. The gain response falls sharply with two radiation-nulls beyond the passband at 3.9 GHz and 4.4 GHz and that increases the selectivity of the antenna. In conclusion, proposed design offers a robust technique to convert a conventional slot coupled rectangular DRA into a wideband antenna along with frequency selective gain response. Proposed configuration manifests as an ideal contender for some specific uses in S-band such as Wi-Max, TD-LTE (Time-Division Long Term Evaluation) application as it avoids the interference adjacent bands.
       
  • High Constant Gain Modified Antipodal Vivaldi Antenna Incorporated with a
           Phase Compensation Lens and a Frequency Selective Surface
    • Abstract: Publication date: Available online 9 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Oznur Turkmen-Kucuksari, Aybike Kocakaya, Sibel Çimen, Gonca ÇakirAbstractThe aim of this study is to demonstrate the design of an antenna with a high gain as well as almost constant gain characteristics over 3.1-10.6 GHz. The modified antipodal Vivaldi MAVARW antenna initially developed in an earlier study is used as the basic antenna. Three different gain enhancement methods such as increasing antenna size, using a phase compensation lens (PCL), and using a frequency selective surface (FSS) are applied and investigated on a comparative basis for this aim. The final MAVARW antenna is composed of a two-cut square ring PCL, and an FSS. The final antenna has a minimum 12.24 gain level with a maximum 1.66 dB gain deviation over 3.1-10.6 GHz in simulations. The simulation results for the final antenna are validated experimentally with very good agreement. A minimum 12.2 dB gain level as well as a maximum 1.8 dB gain deviation is obtained in measurements.
       
  • On the Analysis of Capacitive Rectangular Waveguide Discontinuities Close
           to Arbitrarily Shaped Conducting and Dielectric Posts
    • Abstract: Publication date: Available online 8 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Fernando D. Quesada Pereira, Celia Gomez Molina, Alejandro Alvarez Melcon, Vicente E. Boria Esbert, Marco GuglielmiAbstractIn this work, we propose an integral equation technique for the efficient analysis of capacitive step discontinuities in rectangular waveguides. The method allows for the inclusion of a number of arbitrarily shaped posts in the vicinity of the step discontinuity. The posts can be both metallic or composed of homogeneous dielectric materials. The integral equation formulation is based on the Surface Equivalence Principle, and uses the parallel plate Green’s functions that take into account for the boundary conditions imposed by the host waveguide. The formulation is written in the mixed spatial-spectral frequency domain, and takes advantage of the symmetry of the problem by reducing the original three dimensional (3D) problem to a so called 2.5D problem. The numerical technique has been validated with simulation examples, namely, two lowpass filters that use conducting and dielectric posts of different shapes as impedance inverters. The results provided by the method that we propose have been also compared to those obtained with a commercial full-wave software tool (ANSYS HFSS), showing in all cases a very good agreement with substantially higher computational efficiency.
       
  • Design and analysis of a Broadband electrically small antenna using
           characteristic mode theory
    • Abstract: Publication date: Available online 7 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Atefeh Sohrabi, Hamideh Dashti, Javad Ahmadi-ShokouhAbstractIn this paper, a new broadband electrically small antenna is proposed for WiFi application. This antenna consists of a microstrip-feed-line and a parasitic metamaterial structure in the ground plane. In the proposed antenna, a parasitic metamaterial structure is used to overcome the problem of impedance matching instead of using external matching networks that occupy large space. Size reduction and good impedance matching at 2.4 GHz are achieved by placing a meander-line in the very near field of the microstrip-feed-line. The characteristic mode theory is used to analysis the proposed antenna. This antenna is designed to operate at 2.4 GHz and, its whole size is 8.5 mm × 8.5 mm × 1.524 mm (0.068 λ0 × 0.068 λ0 × 0.012 λ0), which is one of the smallest electrically small antennas available at this frequency. A prototype of the proposed antenna is fabricated and, the measured results indicate that the -10dB impedance bandwidth is 220 MHz from 2.28 to 2.5 GHz. This antenna is made on a single-layer substrate and easily fabricated through the standard planar techniques. The proposed antenna has a compact size and high bandwidth.
       
  • Single-Layer Wideband High-Gain Circularly Polarized Patch Antenna with
           Parasitic Elements
    • Abstract: Publication date: Available online 7 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Niamat Hussain, Huy Hung Tran, Tuan Tu LeAbstractThis paper presents a single-layer circularly polarized (CP) antenna with wideband operation and high gain characteristics. The antenna consists of a squared patch with a diagonal slot as a primary radiating source and a set of symmetrical multiple squared patches on the same plane as the patch, acting as parasitic elements. The parasitic elements are employed to significantly increase not only the 3-dB axial ratio (AR) bandwidth but also the broadside gain radiation. For a demonstration of the design concept, an antenna prototype with an overall volume of 1.18λo × 1.18λo × 0.05λo (λo is the center operating frequency) is fabricated and tested. The detailed design process and the measurements are described and discussed. The measured data indicates that the proposed antenna achieves operating bandwidth of 14.7% (5.05–5.85 GHz) for S11 ≤ –10 dB and AR ≤ 3 dB. In addition, the fabricated antenna also exhibits high gain radiation from 9.1 to 10.8 dBi within the operating bandwidth.
       
  • Compact and Miniaturized Metamaterial-Based Microstrip Fractal Antenna
           with Reconfigurable Qualification
    • Abstract: Publication date: Available online 7 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Kioumars Pedram, Javad Nourinia, Changiz Ghobadi, Negin Pouyanfar, Mohsen KaramiradAbstractDesign procedure of a small dual-band antenna based on composite right/left-handed (CRLH) transmission line is proposed in this article. The conventional microstrip patch is assumed as a primary antenna and then, Minkowski-like fractal geometry is applied. The antenna has a compact size of 20×20mm2, and operates efficiently at 4.4 GHz and 6.1 GHz. The antenna provides high gain of 3.8dB and 6.2dB in the two operating bands, respectively. It also has an omnidirectional radiation pattern with low cross-polarization level. The effect of the fractal structure along with CRLH transmission line concepton the miniaturization and multiband performance of the antenna have been studied. The related results show the accuracy of the theoretical studies and good agreement between simulated and measured results, which verify that the antenna is a suitable candidate for wireless communication applications.
       
  • Event Priority Driven Dissemination EPDD Management Algorithm for Low
           Power WSN Nodes Powered by a Dual Source Energy Harvester
    • Abstract: Publication date: Available online 5 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Ali Mohammed Abdal-Kadhim, Kok Swee LeongAbstractThis paper proposes a low-power wireless sensor node which is able to deal with energy harvesting mismatches. The hardware incorporates thermoelectric and piezoelectric transducers for a dual energy harvester, energy storage, microcontroller, sensor and wireless transceiver. The software incorporates an energy-aware Event-Priority-Driven-Dissemination algorithm to send data based on priority or event occurrence. This algorithm serves both to detect the availability of the energy source and to control the nodes' sleep mode. The outcomes revealed that the hardware power was 0.16 mW and 2.13 mW in sleep and active modes respectively. Also, energy autonomy was comfortably achieved since the dual harvester energy was 90 mW when both sources were available.
       
  • Utilization of Shorted Fractal Resonator topology for high isolation and
           ELC resonator for band suppression in compact MIMO UWB Antenna
    • Abstract: Publication date: Available online 4 November 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Abhik Gorai, Rowdra GhatakAbstractA low profile modified Koch fractal shaped boundary, ultrawideband (UWB) multiple input multiple output (MIMO) antenna is presented. The radiators are elliptically tapered from the feed line with triangular shaped loading. The boundaries of the triangular shaped loading are embedded with modified Koch fractal shape to provide improved impedance matching. A band suppression characteristic at 5.5 GHz is incorporated by using an electric inductive capacitive resonator at the back of the substrate. Enhanced port isolation of
       
  • FPGA Implementation of UWB-IR impulse generator and its corresponding
           decoder based on discrete wavelet packet
    • Abstract: Publication date: Available online 31 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): C.H. Kizil, C. Diou, M. Rabiai, C. TanougastAbstractIn this paper, we propose an IR-UWB pulse generator and its corresponding decoder using respectively inverse discrete wavelet packet transform (IDWPT) and the discrete wavelet packet transform (DWPT) with various wavelets (Haar, Db2, Db4, Coif2, rbio1.5). These architectures being based on FIR filters, polyphase structure were chosen to easily suit in FPGA because of their parallel structures. The interpolator and decimator filter has been optimized using multiplexers to improve the delay, further the N-tap filter is divided into N/2-tap filters in parallel. The result comparisons in terms of BER has been shown for all wavelets through a Gaussian channel transmission. The results confirm the same transmission quality due to the perfect reconstruction property between the proposed IDWPT and DWPT implementation whatever the wavelet types that can be associated with sensors. We designed architectures of receiver and transmitter based on studied wavelets and we implemented them in FPGA to visualize generated pulses by experiences. The proposed FPGA implementations of IDWPT and DWPT architectures for Haar wavelet only require 3888 LUT/740 FF and 5359 LUT/996 FF, respectively, while providing low power consumption. The hardware and timing comparisons with existing techniques prove that our architectures are better. Our proposal permits a low complexity and good performance. Indeed, in transmitter part, one block can simultaneously generate pulses and modulate them. In receiver part, we replace a correlator used in a traditional IR-UWB system and generally complicated by our simple architecture.
       
  • dual-layer and Dual-polarized Metamaterial Inspired Antenna using
           Circular-Complementary Split Ring Resonator Mushroom and Metasurface for
           Wireless Applications
    • Abstract: Publication date: Available online 30 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Mohammad Ameen, Raghvendra Kumar ChaudharyAbstractA compact triple-band and dual-polarized metamaterial inspired antenna loaded with a reactive impedance surface (RIS) based metasurface is presented in this work. The dual-band circular polarization (CP) characteristics are obtained by the combination of the conventional slotted patch loaded with circular-complementary split-ring resonator based mushroom stacked with RIS. The CP radiation is generated due to the introduction of asymmetry in the antenna structure results in the splitting of fundamental mode into two orthogonally polarized modes with 900 phase difference at the resonating frequency. The antenna obtains an overall electrical size of 0.27λ0 × 0.27 λ0 × 0.027λ0 with radiating element size of 0.16λ0 × 0.16 λ0 at 1.7 GHz with ka = 0.72. The final antenna prototype is fabricated and measured which covers bandwidths of (1.66–1.72 GHz) 3.52%, (1.94–2.20 GHz) 13% and (3.68–3.87 GHz) 5.02% for the three bands. The antenna exhibits CP radiation at 2.10 GHz and 3.78 GHz with an axial ratio bandwidth (ARBW) of 2.85% and 1.85% are obtained for the two bands, respectively. Due to the loading of RIS, the antenna gain enhanced to 1.6 dBi, 4.74 dBic, and 3.28 dBic at the three respective frequencies with an overall area reduction of 52.32% is achieved. The antenna provides a wider AR beamwidth for CP radiation (ARBW
       
  • Performance Analysis of Multihop Decode-and-Forward Relay Networks with
           Diversity in Nakagami Fading channels
    • Abstract: Publication date: Available online 29 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Salman Ghofrani-Jahromi, Alireza Zolghadrasli, Mohammad NeinavaieAbstractIn this paper, we consider a multihop Decode-and-Forward (DF) relay network, in which each node receives the signals from its two preceding nodes. We assume Nakagami fading channels with integer fading parameters. In this network, the achievable diversity order is limited by the link between the source and the first relay. We derive the exact outage probability of fixed and selection relaying with spatial channel reuse, and demonstrate that applying selection relaying at the first relay is adequate to achieve full diversity. In order to derive the outage probability of this system in a Nakagami fading environment with integer fading parameters, a simple closed-form expression for the cumulative distribution function (CDF) of the sum of two independent, but not necessarily identically distributed, Erlang random variables is obtained. By approximating the outage probability for the high signal-to-noise ratio (SNR) region, we also derive the diversity order and coding gain of this selection relaying method and the fixed relaying method. The obtained asymptotic performance expressions are generalized for Nakagami fading channels with arbitrary real-valued fading parameters. Numerical and Monte Carlo results are provided which confirm the analytical expressions.
       
  • Spectrum Sensing in a Calibrated Multi-antenna Cognitive Radio: Exact LRT
           Approaches
    • Abstract: Publication date: Available online 28 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Amir ZaimbashiAbstractThis paper addresses the spectrum sensing problem in a calibrated multi-antenna cognitive radio. To do so, a composite hypothesis testing problem is formulated according to the covariance matrix of the received signal. Then, we resort to the likelihood ratio test (LRT) principle to derive some new LRT tests. This problem has been previously solved based on two-step Generalized LRT (2S-GLRT), leading to different detection strategies in comparison to this study; thus the proposed method is referred to as an exact spectrum sensing method. We provide some simulation results to show that the detection performance of the proposed detectors is better than their counterparts, derived based on the 2S-GLRT, as well as some other state-of-the-art approaches given in the literature.
       
  • A 0.3-1.4 GHz Inductorless CMOS Variable Gain LNA Based on the Inverter
           Cell and Self-Forward-Body-Bias Technique
    • Abstract: Publication date: Available online 26 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Farzaneh Soleymani, Yasin Bastan, Parviz Amiri, Mohammad Hossein MaghamiAbstractIn this paper, a low noise amplifier with variable gain is proposed in the frequency range of 0.3 to 1.4 GHz. The proposed circuit is composed of two inverter cell stages in which a variable feedback resistance is used to control the gain in the second stage. In both stages, self-forward-body-bias technique is utilized to reduce the power consumption and improve the circuit performance. High voltage gain, wide range of gain variation, low power consumption, and low noise figure are the most important features of the proposed variable gain low noise amplifier. The circuit is designed and simulated in standard 0.18-µm technology, and consumes 146×108 μm2 of chip area. Operated with a supply voltage of 1.2 V, power consumption of the proposed amplifier is 8 mW with a wide flat gain ranging from -24.9 to 21 dB in variable-gain mode of operation. The proposed circuit in the high-gain mode, operates as a low noise amplifier with high performance and low power consumption where the gain is greater than 20 dB, S11 is less than -24 dB, and noise figure is less than 2 dB in the entire operating frequency range. In this case, the IIP3 is equal to -9.5 dBm.
       
  • Energy Efficiency Maximization by Optimal Fusion Rule in
           Frequency-Flat-Fading Environment
    • Abstract: Publication date: Available online 24 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Meenakshi Awasthi, Madhav J. Nigam, Vijay KumarAbstractIn cognitive radio networks, cooperative spectrum sensing improves the reliability of decision about the primary user channel condition. However, the challenge is to optimize the energy efficiency, as energy consumption is high with cooperative spectrum sensing due to multiple secondary users. In this paper, energy efficiency for cooperative spectrum sensing by optimal fusion rule is investigated and maximized by minimizing the number of secondary users. Here, decision fusion rule for the number of secondary users, is optimized and compared for the fading and non-fading environment. The energy efficiency is maximized and compared for frequency flat-fading channel with non-fading Additive White Gaussian Noise channel. The detection quality metrics as the measure of probability of detection and probability of false alarm, are also considered as constraints. The exhaustive numerical results achieved after simulation in MATLAB, illustrate that the energy efficiency is maximum for non-fading channel and k-out-of-N rule is the best among all fusion rules.
       
  • Analysis of Decoupled Association in HetNets using Soft Frequency Reuse
           Scheme
    • Abstract: Publication date: Available online 22 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Muhammad Saeed Akhtar, Ziaul Haq Abbas, Fazal Muhammad, Ghulam AbbasAbstractMeeting the huge data demands of cellular networks requires an integrated model in terms of interference mitigation technique and cell association scheme. A heterogeneous cellular network (HetNet), which comprises low power small base stations (sBSs) deployed in the coverage of high power macro base station (mBS), plays a vital role in achieving high network performance gains. Large transmit power discrepancy among various tiers of HetNet with maximum received power association scheme results in fewer number of users associated with sBSs causing inefficient utilization of resources. A fraction of users from mBS are offloaded to sBSs for performance improvements, which causes signal-to-interference-plus-noise ratio degradation due to strong mBS interference. Therefore, proactive user association along with interference management technique is essential to abate interference with efficient use of sBSs' resources. In this paper, we consider soft frequency reuse scheme together with decoupled association (DA) to mitigate interference and to achieve load balancing. Results indicate that the proposed unified model achieves enhanced coverage probability due to reduced interference and DA outperforms all other methods used in the state-of-the-art.
       
  • Synthesis of Generalized Immitance Converters via Signal-Flow Graphs
    • Abstract: Publication date: Available online 21 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Marian Pierzchała, Mourad FakhfakhAbstractThis paper describes a synthesis procedure of the structures which input impedance (admittance) is proportional to the product of their immitances (i.e. admittances and impedances). Such structures have many applications in the design of a wide range of circuits such as active filters, oscillators, phase shifters, as well as for parasitic element cancellation and for impedance matching. Up to date, such structures have been developed in two ways. The first was based on deus ex machina rule. Designers were relied on experience and simulation verifications when designing these circuits. The second way was based on the systematic generation (synthesis) of such circuits. Two methods have been used in active network synthesis. The first consists of using the transfer function of the network and the second uses the nodal admittance matrix expansion.In this paper, we propose a novel synthesis method for the generation of the generalized immitance converters via signal-flow graphs. This method is very easy and gives structures of both the voltage and the current generalized immitance converters. Further, it is not limited to the use of a particular analog building block. The synthesis of two types of generalized immitance inverters using unity gain cells is also given. Comparisons with simulation results performed using ideal unity gain cells, CMOS current conveyors and the commercially available AD844 IC are given.
       
  • Pilot Contamination Attack Detection for Multi-Cell MU-Massive MIMO System
    • Abstract: Publication date: Available online 21 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Muhammad Hassan, Muhammad Zia, Awais Ahmed, Naeem BhattiAbstractThis work presents a low-complexity pilot contamination attack (PCA) detector for a multi-cell multi-user massive multiple-input, multiple-output (MU-MaMIMO) system. An active eavesdropper (Eve) in the reference cell transmits synchronized training sequence of the legitimate user (LU) under attack in order to alter precoder to steel information in the downlink data phase. The detection of an active Eve is vital for the information security and enhances secrecy capacity of the LU. We formulate binary hypotheses for active Eve detection from the contaminated channel estimation. We provide performance analysis of the proposed detector. The comparison of analysis and Monte Carlo runs verifies the accuracy of the analysis. The simulation results demonstrate that the performance of the proposed PCA detector is better than the well-known minimum descriptive length (MDL) method in low SNR regime.
       
  • Reliability Evaluation of Point-to-Point Links based on IEEE 802.15.4
           Physical Layer for IWSAN Applications
    • Abstract: Publication date: Available online 19 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Víctor Díez, Aitor Arriola, Iñaki Val, Manuel VelezAbstractThe reliability of point-to-point links for Industrial Wireless Sensor Networks (IWSN) based on the IEEE 802.15.4 physical layer (PHY) and operating in the unlicensed 2.45 GHz radio band is studied in this paper. An in-lab methodology based on channel emulation is used. The IEEE 802.15.4 PHY is tested under different wireless channels: additive white Gaussian noise (AWGN), Rician, Rayleigh, and the IEEE 802.15.4a non-line of sight (NLoS) industrial channel. The metrics used to evaluate the reliability are the packet error rate (PER) and the distribution of packet error burst (PEB). Reliability results are presented and compared with the reliability requirements of typical industrial use cases. Two mathematical expressions are also obtained to predict PER and distribution of PEB as a function of the RMS Delay Spread (RDS).
       
  • Spatial Assessment of Array Antenna based Joint SDMA-TDMA Architecture for
           DS-CDMA Signals
    • Abstract: Publication date: Available online 17 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Amiya Dey, Arnab NandiAbstractFifth Generation (5G) technology is looking forward to coagulation of Multiple Access (MA) techniques for integrating individual benefits. Equidistant Direct-Sequence Code Division Multiple Access (DS-CDMA) signals with no relative separation by Propagation Delay suffer from severity of Multiple Access Interference (MAI). Joint implementation of Space Division Multiple Access (SDMA) and Time Division Multiple Access (TDMA) is proposed here in overcoming the limitations for equidistant sources. Spatial assessment toward effectiveness of DS-CDMA signals with appropriate beamforming in SDMA-TDMA architecture is explored here. Quadriphase Shift Keying (QPSK) modulated equidistant DS-CDMA sources having non-overlapping time deployment are transmitted through Additive White Gaussian Noise (AWGN) channel in occurrence of Near-Far Effect. Direction of Arrival (DOA) estimate and spatial behaviour of DS-CDMA sources are exemplified utilizing MUSIC (Multiple Signal Classification), Root-MUSIC and gold-MUSIC algorithms for Uniform Linear Array (ULA) antenna.
       
  • Corrigendum to “NLOS identification for UWB localization based on import
           
    • Abstract: Publication date: Available online 17 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Xiaofeng Yang, Feng Zhao, Tiejun Chen
       
  • Multiplierless Chaotic Pseudo Random Number Generators
    • Abstract: Publication date: Available online 17 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Ahmed A. Rezk, Ahmed H. Madian, Ahmed G. Radwan, Ahmed M. SolimanAbstractThis paper presents a multiplierless based FPGA implementation for six different chaotic Pseudo Random Number Generators (PRNGs) that are based on: Chua, modified Lorenz, modified Rössler, Frequency Dependent Negative Resistor (FDNR) oscillator, and other two systems that are modelled using the simple jerk equation. These chosen systems can be employed in high speed applications because they don’t utilize any hardware multiplier. The proposed PRNGs have been implemented using VHDL, synthesized on Xilinx, using the FPGA: XC5VLX50T, and tested using the NIST statistical suite. Furthermore, a comparison has been established between the performance of all the PRNGs, regarding the implementation area, speed, and the statistical randomness quality. It has been found that the modified Lorenz PRNG has the best randomness quality and the best hardware performance as it can pass all the NIST tests while operating at 298.597 MHz and utilizing only 0.23% and 0.62% from the FPGA’s slice registers and Look-Up-Tables (LUTs) respectively.
       
  • Outage Probability of NOMA System with Wireless Power Transfer at Source
           and Full-Duplex Relay
    • Abstract: Publication date: Available online 16 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Ba Cao Nguyen, Tran Manh Hoang, Phuong T. Tran, Tan N. NguyenAbstractIn this paper, we analyze the performance of a novel communication scheme that combines three new techniques, namely energy harvesting (EH), full-duplex (FD) relay and cooperative non-orthogonal multiple access (NOMA). In this scheme, both the source and the relay harvest energy from the power beacon (PB) at the first phase of the transmission block and then use the harvested energy to transmit messages during the remaining phase. In this proposed EH-FD-NOMA system, the FD relay employs the amplify-and-forward scheme. We consider two destinations, one of them is far from the FD relay and the other is near the FD relay. Based on the mathematical calculation, we derive the closed-form expressions for the outage probability (OP) of the two users of interest. The numerical results show that the performance at two destinations can be maintained at the same level with proper power allocation. Furthermore, for each value of the PB transmit power, there exists an optimal value for the EH time duration to improve the performance of both users. In addition, the impact of the residual self-interference (RSI) due to imperfect self-interference cancellation (SIC) at the FD relay is also considered. Finally, numerical results are demonstrated through Monte-Carlo simulations.
       
  • Design and Packaging of Multi-Polarized Triple-Band Antenna for Automotive
           Applications
    • Abstract: Publication date: Available online 15 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Niraj Agrawal, Anil Kumar Gautam, Karumudi RambabuAbstractThis paper proposes a novel design and packaging of single-fed asymmetric slot loaded triple band antenna with left-hand circular polarization (LHCP) at SDARS, right-hand circular polarization (RHCP) at GPS L5 band, and linear polarization at GSM-1900 that be able to deploy at hand-held device for geo-informatics and surveying applications. Triple-band operation and multi-polarization are obtained by inculcation of asymmetric slots in the patch. The all-inclusive dimensions of the designed antenna is only 51×52×1.6 mm3, rendering it attractive for the user market. A archetype of the proposed model is fabricated, and its performance is substantiate through measurement. Measured results shows that the antenna exhibits multiple independent polarized radiations, i.e. RHCP and LHCP radiation at two distinct bands namely Global Positioning System (GPS) L5 (1.17645 GHz) and Satellite Digital Audio Radio Service (SDARS) (2.320-2.345 GHz) bands, respectively and linear Polarized radiation at GSM-1900 band. The proposed antenna display good radiation performance when installed on car housing and various other type of housing.
       
  • On the Physical Layer Security over Beaulieu-Xie Fading Channel
    • Abstract: Publication date: Available online 15 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Puspraj Singh Chauhan, Sandeep Kumar, Sanjay Kumar SoniAbstractWith the expansion of IoT and device-to-device communication applications, the security and privacy of the information have been kept at the forefront. The existence of a secondary eavesdropper, which attempts to access the confidential information of the legitimate partners, makes the data communication insecure. In this regard, we study the effect of randomness caused by the Beaulieu-Xie fading channel on the performance of physical layer security. To this end, the analysis for the secrecy outage probability (SOP) and average secrecy capacity (ASC) is carried out. Further, we derived the closed-form expressions for lower-bound of secrecy outage probability and strictly positive secrecy capacity (SPSC) for the said channel. To get more insight into the system, the high-power and low-power analysis of the ASC are also provided. Besides, the impact of different fading parameters on the system matrices is also investigated. Finally, the theoretical results are verified via extensive Monte Carlo simulations.
       
  • Novel Strained Superjunction Vertical Single Diffused MOSFET
    • Abstract: Publication date: Available online 11 October 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Onika Parmar, Prateek Baghel, Alok NaugarhiyaAbstractIn this article, a novel strained superjunction vertical single diffused MOSFET is proposed with enhanced current driving capability. In this design strain is induced by using SiGe layer in a superjunction vertical single diffused MOSFET (SJ-VSDMOS) and it improves the device performance. The structure is simulated in Silvaco 2-D device simulator. Proposed device exhibits 30% increase in current driving capability, 6.8% less gate charge is required by the device with improved peak transconductance on comparing with conventional device. Area specific on resistance of the proposed device is reduced by 24%. Hence, proposed device exhibits enhanced electrical behavior compared to conventional device.
       
  • Spatial-polarization diversity HAP-MIMO transmission system for emergency
           high-capacity mobile communications
    • Abstract: Publication date: Available online 28 August 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Lei Shi, Lei Zhao, Yanming Liu, Qi LiAbstractThe deployment of high-altitude platforms (HAPs) as an emergency communication system is a cost-effective method to deal with the decrease in channel capacity caused by shadows or multipath fading at low elevation angles. This study proposes a 4 × 4 multiple-input multiple-output (MIMO) scheme that employs spatial and polarization diversity to improve the channel capacity for HAP communication systems. This scheme utilizes the advantages of HAP size to install two pairs of dual-polarized antennas between HAP and mobile terminals to form a 4 × 4 spatial-polarized diversity MIMO system to counteract shadows and multipath fading. The polarization and spatial correlation matrices are obtained through the reasonable expansion of a 2 × 2 polarized parametric or spatial geometry MIMO channel model. Simulation results show that the proposed 4 × 4 MIMO transmission scheme can effectively improve the channel capacity by 1.5 times compared with the existing satellite 2 × 2 dual-polarization MIMO system at low elevation angles under typical scenarios.
       
 
 
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