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  Subjects -> COMPUTER SCIENCE (Total: 2129 journals)
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COMPUTER SCIENCE (1235 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 25)
Abakós     Open Access   (Followers: 4)
ACM Computing Surveys     Hybrid Journal   (Followers: 31)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 9)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 17)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 15)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 5)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 9)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 12)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 3)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 16)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 8)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 6)
ACM Transactions on Economics and Computation     Hybrid Journal   (Followers: 1)
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 20)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 8)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 5)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 9)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 8)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 9)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 35)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Informatica Malaysia     Open Access  
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Ad Hoc Networks     Hybrid Journal   (Followers: 11)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Advanced Engineering Materials     Hybrid Journal   (Followers: 29)
Advanced Science Letters     Full-text available via subscription   (Followers: 11)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 8)
Advances in Artificial Intelligence     Open Access   (Followers: 15)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19)
Advances in Computer Engineering     Open Access   (Followers: 4)
Advances in Computer Science : an International Journal     Open Access   (Followers: 15)
Advances in Computing     Open Access   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 59)
Advances in Engineering Software     Hybrid Journal   (Followers: 29)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 14)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Human-Computer Interaction     Open Access   (Followers: 21)
Advances in Materials Science     Open Access   (Followers: 15)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 51)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Advances in Technology Innovation     Open Access   (Followers: 6)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 9)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
AI EDAM     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 14)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 7)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 11)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 5)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 6)
American Journal of Sensor Technology     Open Access   (Followers: 4)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Animation Practice, Process & Production     Hybrid Journal   (Followers: 5)
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access  
Annual Reviews in Control     Hybrid Journal   (Followers: 8)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription   (Followers: 1)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 12)
Applied Categorical Structures     Hybrid Journal   (Followers: 5)
Applied Clinical Informatics     Hybrid Journal   (Followers: 3)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 14)
Applied Computer Systems     Open Access   (Followers: 2)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 33)
Applied Medical Informatics     Open Access   (Followers: 12)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Soft Computing     Hybrid Journal   (Followers: 17)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 7)
Applied System Innovation     Open Access  
Architectural Theory Review     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 153)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 8)
Artifact     Open Access   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 7)
Asia Pacific Journal on Computational Engineering     Open Access  
Asia-Pacific Journal of Information Technology and Multimedia     Open Access   (Followers: 1)
Asian Journal of Control     Hybrid Journal  
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
Australian Educational Computing     Open Access   (Followers: 1)
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 6)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 13)
Automation in Construction     Hybrid Journal   (Followers: 7)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Balkan Journal of Electrical and Computer Engineering     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Behaviour & Information Technology     Hybrid Journal   (Followers: 51)
Big Data and Cognitive Computing     Open Access   (Followers: 4)
Biodiversity Information Science and Standards     Open Access  
Bioinformatics     Hybrid Journal   (Followers: 330)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 35)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 51)
British Journal of Educational Technology     Hybrid Journal   (Followers: 163)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 15)
Capturing Intelligence     Full-text available via subscription  
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cell Communication and Signaling     Open Access   (Followers: 2)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
CERN IdeaSquare Journal of Experimental Innovation     Open Access   (Followers: 3)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
CIN Computers Informatics Nursing     Hybrid Journal   (Followers: 11)
Circuits and Systems     Open Access   (Followers: 15)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Clinical eHealth     Open Access  
Cluster Computing     Hybrid Journal   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Communication Methods and Measures     Hybrid Journal   (Followers: 13)
Communication Theory     Hybrid Journal   (Followers: 24)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Computational Physics     Full-text available via subscription   (Followers: 2)
Communications in Information Science and Management Engineering     Open Access   (Followers: 4)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 4)
Communications of the ACM     Full-text available via subscription   (Followers: 51)
Communications of the Association for Information Systems     Open Access   (Followers: 16)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access   (Followers: 1)
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 6)
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 8)
Computación y Sistemas     Open Access  
Computation     Open Access   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 3)
Computational and Mathematical Biophysics     Open Access   (Followers: 1)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational and Structural Biotechnology Journal     Open Access   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 13)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access   (Followers: 1)
Computational Ecology and Software     Open Access   (Followers: 10)
Computational Economics     Hybrid Journal   (Followers: 10)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 5)
Computational Methods and Function Theory     Hybrid Journal  
Computational Molecular Bioscience     Open Access   (Followers: 2)
Computational Optimization and Applications     Hybrid Journal   (Followers: 8)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Research     Open Access   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computational Science and Techniques     Open Access  
Computational Statistics     Hybrid Journal   (Followers: 14)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 35)
Computer     Full-text available via subscription   (Followers: 105)
Computer Aided Surgery     Open Access   (Followers: 6)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Communications     Hybrid Journal   (Followers: 16)

        1 2 3 4 5 6 7 | Last

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  [3161 journals]
  • Compact Triple Band Bandpass Filters Design using Mixed Coupled Resonators
    • Abstract: Publication date: Available online 14 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Vinay Kumar Killamsetty, Biswajeet Mukherjee In this paper a study of designing Triple Band (TB) Bandpass Filter (BPF) by exploiting Triple Mode Resonator (TMR) is presented. By connecting the stepped impedance and radial stubs in a categorical manner a TMR can be obtained which is the basic component for designing the TB BPF. Microstrip lines are tapped over the resonator to work as feed lines and also to generate transmission zeros. The TMRs are Mixed Electric and Magnetic Coupled (MEMC) which help in generating additional Transmission Zeros (TZs) around passbands. As verification, a TB BPF is designed, fabricated and measured. In the designing process, first, a Dual Band (DB) BPF is designed and analyzed completely with the help of even-odd mode analysis. Extraction of lumped component model for the DB BPF is done in order to study the circuit model of the filter. Then the work is extended to design the proposed Triple Band-Band Pass Filter. The fabricated filters offer an advantage in terms of compact size, low insertion loss, good inter band isolation and harmonic suppression.
  • Sub-Nyquist Wideband Spectrum Sensing Techniques for Cognitive Radio: A
           Review and Proposed Techniques
    • Abstract: Publication date: Available online 14 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): G.P. Aswathy, K. Gopakumar Spectrum scarcity and under-utilization of the apportioned spectral resources by the licensed users have led to the introduction of a new communication paradigm called Cognitive radio (CR). This allows the unlicensed users to exploit the existing wireless spectrum opportunistically. However, the technology offers many challenges and spectrum sensing is one among them. For instance, narrowband spectrum sensing techniques provide spectral opportunities over a narrow frequency range and cannot identify individual spectral opportunities over a wide frequency band. In order to achieve a higher opportunistic throughput, CR is required to have a broader spectral awareness that can potentially be achieved by exploiting more spectral opportunities over a wideband spectrum. Due to many challenges that wideband spectrum sensing offers, it has become a field of interest for many researchers. Conventional wideband spectrum sensing techniques using Nyquist sampling rates, for instance, are infeasible, as they require high-speed analog-to-digital converters (ADCs). A more innovative approach based on sub-Nyquist sampling has thus become an area of extensive research in both academia and industry. This paper is a careful study and evaluation of some of the major sub-Nyquist wideband sensing techniques. Further, we introduce two novel sub-Nyquist sensing techniques and finally some open research challenges in general.
  • A novel UWB low-noise amplifier design using double capacitor
           cross-coupled feedback
    • Abstract: Publication date: Available online 13 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Saeed Ghaneei Aarani, Mohsen Hayati, Amir Hossein Kazemi In this paper, an ultra-wideband (UWB) low noise amplifier (LNA) with improvement in noise figure (NF) and gain flatness using 0.18-um RF CMOS technology is presented. Two cross-coupled capacitors(CCC) and new gain flattening technique in a cascode common-gate structure are used for NF and gain flatness improvement, respectively. In addition, NF calculation of CCC cascode common-gate amplifier is presented considering the noise of cascode stage. The LNA operates from 3.1 GHz up to 10.6 GHz with no change in power consumption compared with conventional one. The proposed LNA achieves average S21 of 21dB and S11 less than −10 dB in the entire bandwidth. Additionally, the minimum NF of 2.38 dB is achieved. Furthermore, the power consumption at 1.8 V supply voltage is 4.34 mW and the core layout size for proposed LNA using CCC with and without including new gain flattening techniques are881μm×1201μm and 680μm×733μm, respectively.
  • Half-Select Free Bit-Line Sharing 12T SRAM with Double-Adjacent Bits Soft
           Error Correction and A Reconfigurable FPGA for Low-Power Applications
    • Abstract: Publication date: Available online 11 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Vishal Sharma, Pranshu Bisht, Abhishek Dalal, Maisagalla Gopal, Santosh Kumar Vishvakarma, Shailesh Singh Chouhan This work presents a half-select free 12T SRAM cell with Data-Dependent Feedback Cutting approach to improve the write ability and isolated read path to enhance the read stability. The enhanced read and write ability is 1.95× and 2.84× larger respectively than that of the conventional 6T cell at 0.4V. The half-select free behavior of proposed cell using the cross-point read/write structure facilitates the bit-interleaving memory architecture to effectively reduce the multi-bits soft error occurrence. The incorporated PMOS stacking effect in inverter pairs of the proposed cell offers the reduced leakage power which is 0.59× to that of 6T, at 0.4V supply. To further minimize the leakage power at array level, the bit lines between two adjacent cells have been shared that consumes only 0.38× leakage power than that of the conventional 6T array for a 1Kb macro. Moreover, a Reconfigurable FPGA architecture is proposed for low power applications. The simulated static and active power consumption of 12T SRAM based reconfigurable FPGA is 0.22× and 0.45× when compared with the regular 12T FPGA. Finally, a Double Adjacent-bits Error Detection and Correction (DAEDC) scheme is suggested for the proposed bit-interleaved 12T SRAM array, to reduce the soft error effects.
  • Cross-layer scheme for low latency multiple description video streaming
           over Vehicular Ad-hoc NETworks (VANETs)
    • Abstract: Publication date: Available online 9 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Mohamed Aymen Labiod, Mohamed Gharbi, François-Xavier Coudoux, Patrick Corlay, Noureddine Doghmane There is nowadays a growing demand in vehicular communications for real-time applications requiring video assistance. The new state-of-the-art high-efficiency video coding (HEVC) standard is very promising for real-time video streaming. It offers high coding efficiency, as well as dedicated low delay coding structures. Among these, the all intra (AI) coding structure guarantees minimal coding time at the expense of higher video bitrates, which therefore penalizes transmission performances. In this work, we propose an original cross-layer system in order to enhance received video quality in vehicular communications. The system is low complex and relies on a multiple description coding (MDC) approach. It is based on an adaptive mapping mechanism applied at the IEEE 802.11p standard medium access control (MAC) layer. Simulation results in a realistic vehicular environment demonstrate that for low delay video communications, the proposed method provides significant video quality improvements on the receiver side.
  • Co-axial Fed Triple-band and Dual-band Zeroth Order Antennas using
           Pseudo-Open Termination Unit Cells for C-band Applications
    • Abstract: Publication date: Available online 8 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): M. Harish Adhithya, Gudibandi Bharath Reddy, D. Sriram Kumar In this paper, a triple-band and dual-band zeroth order resonance (ZOR) epsilon negative antennas are proposed using two pseudo-open termination unit cells for the case where the shunt ZOR (fsh) is higher than the series ZOR (fse1). The epsilon negative transmission line (ENG TL) resonates fsh while the series ZORs (fse1 and fse2) are excited by the series capacitance of the two pseudo-open termination unit cells. If the series capacitances of the two pseudo-open termination unit cells are different then fse1 and fse2 are excited, else only fse1 is excited. fse1 and fse2 along with fsh results in triple-band ZOR antenna, while a single fse1 with fsh results in dual-band ZOR antenna. The pseudo-open termination unit cells can be placed anywhere around the ENG TL to get proper matching. All the resonances for both the antennas follow zeroth order characteristics which are verified using electric field vector. The measured peak gains of the triple-band ZOR antenna for fse2,fse1 and fsh are 1.14 dBi, 1.39 dBi, and 2.19 dBi, respectively, wi...
  • Improved Impulse Noise Modeling for Indoor Narrow-Band Power Line
    • Abstract: Publication date: Available online 6 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Fatma Rouissi, Adrianus Johannes Han Vinck, Hèla Gassara, Adel Ghazel This paper presents a novel low-complexity fully parametric frequency-dependent impulse noise model for Narrow-Band PLC in the frequency band below 500 kHz. The statistical characterization of measured noise in terms of impulse temporal waveform and the average PSD allowed to confirm the limitations of the commonly used Middleton class-A model due to its flat PSD that is not matching measurements results. To improve the impulse noise model matching with measurement results, a two-state model using impulses in the form of damped sinusoids is proposed. Comparison of the time and frequency characteristics of the proposed model with measurement show the presence of modeled pulses with shapes close to the measured noise, as well as a good matching in the average PSD. Simulation results in using the proposed model for FSK and OFDM systems design show good accuracy to the measured noise, in terms of detector outputs in 2-FSK, bit error rates and fraction of errors per sub-band in the OFDM-based transmission.
    • Abstract: Publication date: Available online 6 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): K. Sowmya, N.B. Balamurugan, V. Parvathy The prototype of Fe doped Dual Material Gate AlGaN/AlN/GaN High Electron Mobility Transistors(HEMTs) developed by a Finite Difference Method(FDM) is addressed in this paper. The equations are illustrated in a way that the dual material gate disintegrates into two distinct single material gates by discreting one 2-D equation into two isolated equations. The boundary conditions conclude in the clubbed model of two 1D equations. The work functions of two metal gates, their length difference and applied drain voltage, the proposed model estimates the Channel potential, Electric field, Threshold voltage and Drain current. A momentous increase of the drain current is witnessed when the δ-doping is integrated in the AlN layer. These features are also validated by TCAD Simulations.
  • New CFOA-Based First-Order All-Pass Filters and Their Applications
    • Abstract: Publication date: Available online 6 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Erkan Yuce, Rakesh Verma, Neeta Pandey, Shahram Minaei In this paper, new two first-order all-pass filters (APFs) employing current feedback operational amplifiers (CFOAs) are proposed. The first proposed APF uses two CFOAs while the second one contains three CFOAs. The main features of the both of the proposed APFs are the use of a grounded capacitor, having adjustable gain and possessing low output impedance. Also, the second-proposed APF derived from the first one has high input impedance, and can simultaneously provide both inverting and non-inverting APF responses; nonetheless, both of the proposed APFs need a single passive element matching condition for proper operation. Single phase and multiphase oscillators are included to illustrate applications of the proposed APFs. Several simulations and experiments based on commercially active devices such as AD844s are carried out to verify the theory.
  • One-terminal electronically controlled fractional-order capacitor and
           inductor emulator
    • Abstract: Publication date: Available online 4 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Stavroula Kapoulea, Costas Psychalinos, Ahmed S. Elwakil, Ahmed G. Radwan A novel topology for simultaneous emulation of fractional-order capacitors and inductors is presented in this paper. In particular, onlyone control terminal is used in order to select the type of the element as well as its fractional order. This is achieved through an appropriate fitting of the expressions of the intermediate bias currents, in such a way that, eventually, only the adjustment of one main bias current is required. The performance of the proposed topology is evaluated through post-layout simulations using Cadence and Austria Mikro Systeme (AMS) 0.35μm CMOS process.
  • A diagrammatic approach to single-electron spintronics and a new
           analytical model for ferromagnetic single-electron transistors
    • Abstract: Publication date: April 2019Source: AEU - International Journal of Electronics and Communications, Volume 102Author(s): Mehdi Ahmadian, Mohammad Javad Sharifi In this paper, we propose a diagrammatic approach to single-electron spintronics and develop a new analytical model for ferromagnetic single electron transistors (FSETs) using the proposed approach. Before this, we have reported an analytical model for FSET which was the only analytical model for FSETs introduced. It was a zero temperature one and was based on orthodox theory by solving several long equations simultaneously such that if one deals with a large system which includes several devices, number of complex equations is increased significantly. Here, the new proposed analytical model uses a much simpler diagrammatic approach and less calculation compared to the existing analytical model. We have used the model for two types of island material based on that spin splitting be negligible or not. This model provides a clear physical insight into single-electron spintronics and has been verified against the existing analytical model and numerical simulations. A good agreement has been shown and the model validity has been established.
  • All-Digital Clock and Data Recovery Circuit for USB Applications in 65nm
           CMOS Technology
    • Abstract: Publication date: Available online 1 March 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Sanaz Salem, Mohsen Saneei An all-digital clock and data recovery (CDR) circuit is proposed in this work. The modified structure of multi-level bang-bang phase detector (BBPD) is proposed to eliminate the metastability problem at locking time and the phase difference of ±180◦. For fine tuning of the phase, the Vernier time to digital converter (TDC) with multi-mode delay cell is proposed in order to provide various delays in the delay lines for achieving various resolutions under different conditions. For reducing the power consumption and chip area, all of the blocks designed for the CDR have digital structures. Also the scalability and tolerance to process, voltage and temperature (PVT) variations are improved in the proposed CDR with digital topology. The CDR occupies 0.02mm2 in TSMC 65nm CMOS technology. The total power consumption of the CDR is 2.815mW @ 10Gbit/s from 1V power supply. The proposed CDR is designed for USB2, USB3 and USB3.1 applications and its RMS jitter can follow USB standards.
  • Single-input Multiple-output Voltage-mode Shadow Filter based on VDDDAs
    • Abstract: Publication date: Available online 28 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Pintira Huaihongthong, Amornchai Chaichana, Peerawut Suwanjan, Surapong Siripongdee, Wisuit Sunthonkanokpong, Piya Supavarasuwat, Winai Jaikla, Fabian Khateb This paper presents a voltage-mode shadow filter with single-input multiple-output (SIMO) configuration using voltage differencing differential difference amplifiers (VDDDAs). In this design, the low-pass and high-pass output functions of the single-input three-output second order filter are feedback via the voltage amplifier. The proposed filter consists of three VDDDAs, one grounded resistor and two grounded passive elements. The proposed filter uses grounded elements which is attractive for integrated circuit (IC) fabrication. It can simultaneously provide low-pass (LP), high-pass (HP), band-pass (BP), band-reject (BR) and all-pass (AP) responses without matching condition. The proposed circuit has high input impedance. The natural frequency (ω0) and quality factor (Q) can be independently and electronically tuned by changing the external DC bias currents. The effect of the non-ideal and parasitic elements of the VDDDA is studied and investigated. The PSpice simulation and experimental results using CMOS technology and commercially available active devices are given to confirm the workability of the proposed filter.
  • Performance Analysis of a Co-Operative PLC/VLC System with Multiple Access
           Points for Indoor Broadcasting
    • Abstract: Publication date: Available online 28 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Manan Jani, Parul Garg, Akash Gupta In this study, the authors investigate a mixed co-operative power line communication (PLC)/ visible light communication (VLC) system for indoor broadcasting communication systems. The PLC system acts as a backhaul link to the VLC link. The information from the PLC link is transmitted to the VLC link with the assistance of a relay employing decode and forward (DF) protocol. The PLC system is subjected to log normally distributed fading and additive noises. The VLC link consists of multiple access points (APs) which serve the end users. The channel characteristics of the VLC systems are dependent on the randomly distributed user positions. The selection combining (SC) diversity combining technique is employed to select that access point which offers the maximum instantaneous signal to noise ratio (SNR) to the end user at the VLC end. We present the closed form expressions of the cumulative distribution function (CDF) and probability density function (PDF) of the equivalent end to end SNR of the proposed mixed powerline/ visible light communication system. Furthermore, the performance of the system is analyzed in terms of various performance metrics such as outage probability and bit error rate (BER).
  • Modelling, analysis and testing of an active element based wide-band
           frequency tunable compact rat-race hybrid
    • Abstract: Publication date: Available online 26 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Biswajit Dwivedy, Santanu Kumar Behera The article focuses on detail mathematical modelling and analysis of a wideband frequency reconfigurable 180° hybrid followed by experimental verification. The device is designed by replacing basic λg/4 lines with varactor based low-pass equivalent circuits, which results dimensional compactness (0.16λ×0.18λ×0.008λ at 1.6 GHz) of 70% compared to the conventional structure. The operational frequencies of the hybrid are altered by simultaneously tuning six active varactor diodes in reverse biased mode which shows overall wide operational tunable bandwidth (83%, S11
  • Low profile multiband meander antenna for LTE/WiMAX/WLAN and INSAT-C
    • Abstract: Publication date: Available online 26 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Riki Patel, Trushit Upadhyaya, Arpan Desai, Merih Palandoken A multi-band planar antenna inspired from a meander line structure is proposed. The antenna is printed on a low-cost FR4 substrate having loss tangent, dielectric constant and height of 0.02, 4.4, and 1.6 mm respectively. The conductive patch consists of design inspired by Meander lines which is optimized to achieve targeted frequency bands. Partial ground plane acting as a defected ground structure is incorporated on the bottom side which is engineered for achieving acceptable bandwidths for multi-frequency bands. The proposed antenna has an overall size of 40 x 40 x 1.6 mm2 which resonates at 2.47-2.54 GHz, 4.14-4.23 GHz, 5.43-5.78 GHz and 6.71- 7.42 GHz, respectively having the reflection coefficient (S11) better than 10 dB and a peak gain of 0.5 dBi to 4.5 dBi for all the resonant frequencies. The simulated and measured results show great correlation making the antenna suitable for its use in WiMAX, LTE, WLAN, and INSAT C-Band applications.
  • Optimal Fractional-Order Highpass Butterworth Magnitude Characteristics
           Realization Using Current-Mode Filter
    • Abstract: Publication date: Available online 25 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Shibendu Mahata, Rajib Kar, Durbadal Mandal In this paper, six optimal fractional-order transfer functions (FOTF) to approximate the magnitude characteristics of a fractional-order highpass Butterworth filter (FHBF) are presented. A novel cost function is proposed which specifically considers the characteristics of an ideal (1+α), where 0 < α < 1, order FHBF over both the passband and the stopband. The proposed models, optimized using Symbiotic Organisms Search (SOS) algorithm, are compared with the published literature. PSPICE simulations are conducted to validate the performances of the proposed FHBFs realized by using second generation current-conveyor.
  • A Varactor Based Tunable RF Filter for Multistandard Wireless
           Communication Receivers
    • Abstract: Publication date: Available online 25 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Ali Othman, Rim Barrak, Ghalid Idir Abib, Mohamed Mabrouk This paper presents the design of a tunable RF filter dedicated for multistandard operation in Software Defined Radio (SDR) receivers. This filter is based on the Dual-Behaviour Resonators (DBR) topology realized in microstrip technology with PTFE substrate and using SMV1405 varactors as tuning elements. It provides the independent control of its center frequency and bandwidth relative to the radio standards UMTS, Wi-Fi and LTE (Band N°7). The center frequency ranges from 2.142 to 2.65 GHz and the required bandwidth varies from 86 to 108 MHz. S-parameters simulations and measurements with non-linearity study are provided to evaluate the performance of the designed filter. A very good agreement between simulations and measurements is obtained and the designed filter shows acceptable performances in terms of insertion and return losses which are less than 6 dB and more than 14 dB, respectively for all bands. Moreover, linear properties regarding receiver requirements with a minimum 1-dB compression point (P1dB) of 11.4 dBm and a minimum third order intercept point (IP3) of 21.2 dBm are satisfying.
  • Deep Neural Network–based Soft Computing The Resonant Frequency of
           E–Shaped Patch Antennas
    • Abstract: Publication date: Available online 21 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Deniz Ustun, Abdurrahim Toktas, Ali Akdagli In this study, deep neural network (DNN) is implemented to soft computation of the resonant frequency of E–shaped patch antenna (ESPA). A DNN model is built on a 5-layer framework using adaptive learning rate algorithm though a simulated database of 144 ESPAs. The framework and hyperparameters of the DNN model are optimized by exploiting K–fold cross validation method in the training phase. In order to generate the database for training and testing the model, 144 ESPAs with different geometrical and electrical parameters are simulated in terms of the resonant frequency using a precise electromagnetic analysis platform. The DNN model is trained on the dataset#130 with an average percentage error (APE) of 0.269 between the simulated and computed frequency values. For corroboration of the proposed DNN model is tested and verified by comparing with previously applied traditional neural networks on the remainder dataset#14, and even verified on a fabricated ESPA operating at 2.4 GHz. The DNN model computes the resonant frequency of the testing dataset#14 with the highest accuracy of 0.285 APE. The results show that the proposed deep neuro-computing model for the resonant frequency is a powerful and helpful technique as an easy alternative to prohibitive measurement and simulation.
  • Energy Aware Cluster Based Multi-hop Energy Efficient Routing Protocol
           using Multiple Mobile Nodes (MEACBM) in Wireless Sensor Networks
    • Abstract: Publication date: Available online 20 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Amanjot Singh Toor, A.K. Jain Routing in Wireless Sensor Networks (WSNs) is the most significant and the challenging issue for the researchers in terms of enhancing its performance in terms of network lifetime, energy efficiency, scalability, connectivity, throughput etc. They have the incredible capability to interact and gather data from any physical environment with help of routing protocols. Many routing protocols based solutions have been proposed in the recent years for accomplishing the preferred level of performance in WSNs for these issues. The hierarchical heterogeneous cluster based energy efficient routing protocols are more efficient as compared to flat and location based routing protocols due to the presence of nodes heterogeneity in terms of energy level of sensor nodes which enhances the lifetime of the network. The most recent trend that extensively enhances the functionality and the performance of WSNs is the use of mobile sensor nodes. In this paper, the authors proposea a novel concept regarding mobile sensor nodes is proposed called Mobile Energy Aware Cluster Based Multi-hop (MEACBM) routing protocol for hierarchical heterogeneous WSNs which selects CHs on the basis of newly proposed probability equation which selects only that sensor node as Cluster Head (CH) which has the highest energy among other sensor nodes by introducing a new term S(i).E in the equation. It considers hierarchical heterogeneous clustering considering three levels of sensor nodes; multi-hoping for inter-cluster communication and connectivity of sensor nodes within the whole network area. In MEACBM, after the deployment of sensor nodes and formation of clusters, the whole network area is divided into sectors and inside each sector a mobile sensor node is placed which act as Mobile Data Collector (MDC) for collecting data from CHs. This technique helps in significantly reducing the energy consumption of sensor nodes for transferring information to the Base Station (BS). Simulation performance based results indicates the effectiveness of MEACBM routing protocols by comparing it with other contemporary cluster based routing protocols in terms of network lifetime, stability, throughput, number of CHs and number of dead nodes.
  • Towards Software Defined Antenna for Cognitive Radio Networks through
           Appropriate Selection of RF-switch using Reconfigurable Antenna Array
    • Abstract: Publication date: Available online 16 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Ahmed Mansour, Ahmed F. Tayel, Aya Khames, Mohamed Azab, Sherif I. Rabia, Nader Shehata There is a continuous demand for wireless devices that can adapt to different channel characteristics, while operating on high transmission data-rates utilizing several communication bands. Cognitive Radio (CR), and Software-Defined Radio (SDR) emerge as a favorable settlement to improve spectrum utilization and maximize the usage of frequency bands between users. CR relies on dynamic resource sharing between primary and secondary users through frequency hopping facilitated by the attached SDR tunable antenna. This paper proposes efficient, flexible antenna array design with reconfigurable frequency bands through radio frequency switches (RF-switches) towards enabling a Software Defined Antenna (SDA). RF-switches are used to enable reconfigurable antennas to manipulate frequency, bandwidth, and directivity. The proposed antenna design is verified using Electromagnetic High Frequency Simulation Software (HFSS) tool. Moreover, we address extensive ON/OFF switching cases to determine the proper selection of RF-switch(s) configurations and types to best serve CR networks. The proposed antenna design can be integrated with programmable kits as front end radio element to dynamically enable band manipulation through software programs. Thence, we exploit a queuing model for better spectrum sharing between CR networks users. Results show the efficiency of using Field Effect Transistor (FET) as RF-switches for the proposed antenna design in CR networks.
  • An Ultrathin and Narrow Bandpass Frequency Selective Radome with Wide
           Reflection Bands
    • Abstract: Publication date: Available online 13 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Weiwei Wu, Yuhong Ma, Ximeng Zhang, Chenxin Li, Naichang Yuan This paper proposes an ultrathin K-band Frequency Selective Surface with one narrow passband and wide reflection bands. This 0.254 mm thick and soft FSS has only one passband under 30 GHz. Physical reasonings, simu- lations and experimental verifications are presented for it. Its measured 1 dB bandwidth is from 23.5 GHz to 24.6 GHz. This FSS structure is very insensitive to different polarizations and a large variation of the RF incident angle. Working as a low-profile radome for its covered antenna, this FSS is electromagnetic transparent within its passband; out of this passband, it helps the antenna achieve Radar Cross Section (RCS) reduction or protects the antenna from interference. It can be a good candidate for the applica- tions such as antenna radomes and spatial filters, in which a wide frequency range of electromagnetic interference needs to be suppressed.
  • Effect of Interface Trap Charges on the Performance of Asymmetric
           Dielectric Modulated Dual Short Gate Tunnel FET
    • Abstract: Publication date: Available online 11 February 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Adhithan Pon, Kuralla Sivanaga Venkata Poorna Tulasi, Ramesh Rathinam In this paper, the influence of interface trap charges on the characteristics of asymmetric dielectric modulated dual short gate tunnel field effect transistor (ADMDG-TFET) has been analysed. The effect of a donor (positive) and acceptor (negative) trap charges with various concentrations on the device d.c characteristics are studied. A comparative analysis has been performed between symmetric silicon dual gate tunnel field effect transistor (DG-TFET) and ADMDG-TFET (both Si and Si0.3Ge0.7) with matching dimensions in the presence/absence of interface trap charges. It is found that a shift in threshold voltage (Vth) and subthreshold swing (SS) degradation are observed due to the presence of interface traps in both devices. However, the ADMDG TFET is more immune to Vth shift and SS degradation by acceptor and donor interface traps compared to silicon DG TFET. Also, the ambipolar current in ADMDG TFET is more suppressed than the silicon DG TFET in the presence of trap charges.
  • Co-design of Low Profile Single-fed Circularly Polarized Filtering Antenna
           with high Out-of-band Rejection
    • Abstract: Publication date: Available online 29 January 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Zixian Wu, Anxue Zhang, Jianzhong Chen, Xinru Lu, Jianxing Li A co-design of circularly polarized (CP) filtering antenna is proposed in this paper. The filtering antenna system consists of two λ/2 open-loop resonators which improve the selectivity of passband and a corner-truncated patch which works as both a radiating element and the last stage resonator of filtering network to form an extra minima/pole. Furthermore, an attenuation on the high side of passband is introduced through cross coupling between the first open-loop resonator and CP antenna. By vertically and seamlessly integrating the patch with open-loop resonators, a third-order filtering response is obtained while transition loss is removed. Additionally, the ground plane is shared by the patch and the filtering network to reduce size occupation. An antenna prototype has been fabricated and measured, good agreement is achieved between measurements and simulations. In conclusion, proposed antenna reaches a more compact structure due to multiple functions realized by the patch, a better frequency selectivity and high rejection due to the extra attenuation pole introduced through cross coupling between patch and the first resonator.
  • Generalized Two-port Network Based Fractional Order Filters
    • Abstract: Publication date: Available online 29 January 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Nariman A. Khalil, Lobna A. Said, Ahmed G. Radwan, Ahmed M. Soliman This paper proposes a general prototype fractional order filter based on a two-port network concept with four external impedances. Three induced classifications from the general prototype are extracted with one, two and three external impedances, achieving ten possible generalized topologies. The external impedances are fractional-order elements and resistors. There is forty-six filters divided into twenty-two and twenty-four different general fractional filters of order “α” and order “α+β”, respectively. The general transfer functions, the necessary network conditions and the critical frequencies are presented for each topology in terms of the transmission matrix parameters of a general two-port network and the fractional order parameters. These aspects add extra degrees of freedom, which increase the design flexibility and controllability; it is up to the designer to select any network suitable for his application. Six special cases of two-port networks based on the second generation current conveyor (CCII) active building block are synthesized to realize the proposed topologies. CCII family has four members that yield twenty-four different transmission matrices, resulting 480 filters. Due to the large number of filters, selected cases are investigated in detail to validate the theoretical findings through numerical simulations, Spice simulations and experimental results.
  • Enhanced OFDM-NOMA for Next Generation Wireless Communication: A Study of
           PAPR Reduction and Sensitivity to CFO and Estimation Errors
    • Abstract: Publication date: Available online 16 January 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Vinay Kumar Trivedi, Khaled Ramadan, Preetam Kumar, Moawad Ibrahim Dessouky, Fathi E. Abd El-Samie Orthogonal Frequency Division Multiplexing (OFDM) based on Non-Orthogonal Multiple Access (NOMA) has been previously studied to fulfil the demands of high spectral efficiency, massive connectivity and resilience to frequency selectivity for upcoming fifth generation (5G) wireless communication and beyond. NOMA enables spectrum overlapping and allows distinct users to simultaneously operate over the same frequency band, and thus enables massive connectivity. High Peak-to-Average Power Ratio (PAPR) and sensitivity to Carrier Frequency Offset (CFO) are significant demerits to deploy such a multicarrier system for 5G and beyond applications. This paper studies the problem of high PAPR and the presence of CFO with efficient pre-coding techniques and a very simplified receiver design. An improved Minimum Mean Square Error (MMSE) receiver is proposed for low-complexity Joint Equalization and CFO Compensation (JECC) in frequency domain using Banded-Matrix Implementation (BMI). Moreover, we have investigated the sensitivity of different pre-coding techniques with channel and CFO estimation errors.
  • High CMRR Current-mode Instrumentation Amplifier for Low Voltage and Low
           Power Applications
    • Abstract: Publication date: Available online 14 January 2019Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): Bhartendu Chaturvedi, Atul Kumar This paper introduces a current-mode instrumentation amplifier circuit which employs one modified dual-X current conveyor transconductance amplifier only. The proposed instrumentation amplifier circuit is operated at ± 0.75 V and consumes maximum power of 0.64 mW only, thus suitable to low voltage, low power applications. The circuit also has the feature of cascadability. The differential mode gain of the proposed circuit is electronically tunable and less affected by the temperature variation. Additionally, differential mode gain is bandwidth independent. The common mode rejection ratio of the circuit is 175 dB at lower frequencies and remains as high as 38 dB at 100 MHz. The non-ideal and parasitic analyses of proposed instrumentation amplifier are also discussed. The effects of threshold voltage variation of MOS transistors on differential mode gain are further examined. PSPICE simulations with 0.13 µm CMOS process parameters are performed to confirm the theoretical proposals. Moreover, the proposed circuit is also tested experimentally via commercially available ICs (AD844 and LM13700).
  • EVM based rate maximized relay selection for cooperative cognitive radio
    • Abstract: Publication date: Available online 26 December 2018Source: AEU - International Journal of Electronics and CommunicationsAuthor(s): S. Lavanya, M.A. Bhagyaveni Cooperative relaying being a novel technique in cognitive radio (CR) communications promises enhanced performance for secondary users (SU) by exploiting spatial diversity. This paper proposes a cooperative framework for the rate maximized relay selection (RRS) based on error vector magnitude (EVM). EVM is the measure of error vector between received constellation points to the ideal ones. The problem is transformed to convex optimization (CO) problem for maximizing the capacity for both primary user (PU) and SU network in a interweave communication model. Simulation result reveals that PU can achieve higher capacity with cooperative relaying compared to the direct transmission and energy constraint of the cognitive radio network (CRN) is met by implementing RRS algorithm. Energy efficiency is improved up to 19% more than the conventional schemes. Furthermore, PU provides the opportunistic time gain (OTG) for those SU’s that act as relay for its transmission.
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