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COMPUTER SCIENCE (1160 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 13)
Abakós     Open Access   (Followers: 3)
Academy of Information and Management Sciences Journal     Full-text available via subscription   (Followers: 73)
ACM Computing Surveys     Hybrid Journal   (Followers: 22)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 9)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 13)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 6)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 11)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 13)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 4)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 1)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 4)
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: 3)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 10)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 8)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 11)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 22)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Ad Hoc Networks     Hybrid Journal   (Followers: 11)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Advanced Engineering Materials     Hybrid Journal   (Followers: 26)
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 8)
Advances in Artificial Intelligence     Open Access   (Followers: 16)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Computer Science : an International Journal     Open Access   (Followers: 13)
Advances in Computing     Open Access   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Human-Computer Interaction     Open Access   (Followers: 20)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Advances in Technology Innovation     Open Access   (Followers: 2)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 7)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Air, Soil & Water Research     Open Access   (Followers: 8)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 6)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 11)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 7)
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: 3)
Annals of Data Science     Hybrid Journal   (Followers: 9)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annual Reviews in Control     Hybrid Journal   (Followers: 6)
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: 2)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 14)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Clinical Informatics     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Computer Systems     Open Access   (Followers: 1)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 33)
Applied Medical Informatics     Open Access   (Followers: 11)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Soft Computing     Hybrid Journal   (Followers: 16)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Architectural Theory Review     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 128)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 6)
Asia Pacific Journal on Computational Engineering     Open Access  
Asia-Pacific Journal of Information Technology and Multimedia     Open Access   (Followers: 1)
Asian Journal of Computer Science and Information Technology     Open Access  
Asian Journal of Control     Hybrid Journal  
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
Australian Educational Computing     Open Access  
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 3)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 9)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Basin Research     Hybrid Journal   (Followers: 5)
Behaviour & Information Technology     Hybrid Journal   (Followers: 52)
Bioinformatics     Hybrid Journal   (Followers: 301)
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: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 44)
British Journal of Educational Technology     Hybrid Journal   (Followers: 126)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 2)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 14)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
Cell Communication and Signaling     Open Access   (Followers: 1)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
CERN IdeaSquare Journal of Experimental Innovation     Open Access  
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: 7)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
CIN Computers Informatics Nursing     Full-text available via subscription   (Followers: 12)
Circuits and Systems     Open Access   (Followers: 16)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Communication Methods and Measures     Hybrid Journal   (Followers: 11)
Communication Theory     Hybrid Journal   (Followers: 20)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 3)
Communications of the ACM     Full-text available via subscription   (Followers: 53)
Communications of the Association for Information Systems     Open Access   (Followers: 18)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access  
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: 9)
Computación y Sistemas     Open Access  
Computation     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
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: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access  
Computational Ecology and Software     Open Access   (Followers: 9)
Computational Economics     Hybrid Journal   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 14)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Molecular Bioscience     Open Access   (Followers: 2)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
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: 13)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 31)
Computer     Full-text available via subscription   (Followers: 85)
Computer Aided Surgery     Hybrid Journal   (Followers: 3)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Communications     Hybrid Journal   (Followers: 10)
Computer Engineering and Applications Journal     Open Access   (Followers: 5)
Computer Journal     Hybrid Journal   (Followers: 7)
Computer Methods in Applied Mechanics and Engineering     Hybrid Journal   (Followers: 22)
Computer Methods in Biomechanics and Biomedical Engineering     Hybrid Journal   (Followers: 10)
Computer Methods in the Geosciences     Full-text available via subscription   (Followers: 1)
Computer Music Journal     Hybrid Journal   (Followers: 16)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Computer Science - Research and Development     Hybrid Journal   (Followers: 7)
Computer Science and Engineering     Open Access   (Followers: 17)
Computer Science and Information Technology     Open Access   (Followers: 11)
Computer Science Education     Hybrid Journal   (Followers: 12)
Computer Science Journal     Open Access   (Followers: 20)
Computer Science Master Research     Open Access   (Followers: 10)
Computer Science Review     Hybrid Journal   (Followers: 10)

        1 2 3 4 5 6 | Last

Journal Cover AEU - International Journal of Electronics and Communications
  [SJR: 0.318]   [H-I: 36]   [8 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1434-8411
   Published by Elsevier Homepage  [3043 journals]
  • Floating active inductor based Class-C VCO with 8 digitally tuned
    • Authors: Rishab Mehra; Vikash Kumar; Aminul Islam
      Pages: 1 - 10
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Rishab Mehra, Vikash Kumar, Aminul Islam
      A fully integrated floating active inductor based voltage-controlled oscillator (VCO) is presented. The active inductor employs voltage differencing transconductance amplifier (VDTA) asa building block. The designed VCO achieves frequency tuning by varying the bias current through the VDTA and utilizes a Class-C topology for improving the phase noise performance. The inductor-less VCO is designed and implemented in a 45-nm CMOS process and its performance is estimated using Virtuoso ADE of Cadence. Operating at a supply voltage of ±1V, the proposed VCO consumes 0.44–1.1mW corresponding to the oscillation frequency of 1.1–1.8GHz thereby exhibiting a tuning range of 48.27%. The phase noise of the VCO lies in the range of −94.12 to −98.37 dBc/Hz at 1MHz offset resulting in a FOM of −172.14 to −176.69 dBc/Hz.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.08.018
      Issue No: Vol. 83 (2017)
  • Trident-shape strip loaded dual band-notched UWB MIMO antenna for portable
           device applications
    • Authors: Chandrasekhar Rao Jetti; Venkateswara Rao Nandanavanam
      Pages: 11 - 21
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Chandrasekhar Rao Jetti, Venkateswara Rao Nandanavanam
      In this paper, a novel compact dual band-notched ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna of size 22×26×0.8mm3 is proposed for portable devices. The antenna comprises of two stepped slot UWB antennas fed by 50ohms microstrip line, T-shape slot and narrow slot. Dual band-notches from 5.4 to 5.86GHz and 7.6–8.4GHz are achieved by loading trident-shape strips on microstrip line. A T-shape slot is used on the ground plane to enhance impedance matching characteristics and to minimize mutual coupling above 4GHz. To improve isolation further at 3–4GHz, a narrow slot is used on ground. The proposed antenna is giving a good bandwidth ranging from 3.1 to 11.8GHz with S11 >10dB and mutual coupling larger than 20dB in the entire operating band except at two rejected bands. The simulation and measurement results demonstrate that the antenna is more suitable for portable device applications.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.08.021
      Issue No: Vol. 83 (2017)
  • CPW-Fed UWB antenna with sharp and high rejection multiple notched bands
           using stub loaded meander line resonator
    • Authors: Hany A. Atallah; Adel B. Abdel-Rahman; Kuniaki Yoshitomi; Ramesh K. Pokharel
      Pages: 22 - 31
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Hany A. Atallah, Adel B. Abdel-Rahman, Kuniaki Yoshitomi, Ramesh K. Pokharel
      This paper presents a CPW-fed UWB filter-antenna with sharp and high rejection multiple band notches for band-notched UWB communication applications. The band notch operation is achieved by employing a sharp bandstop filter (BSF) with multiple reject bands using only one element meander line resonator at the bottom layer through theoretical calculations and parametric studies. The adjustment of the notched bands is successfully accomplished by loading the meander line with open ended stubs to modify the harmonic frequencies to the desired bands. The structure of the proposed BSF is simple and compact so that the proposed filter-antenna is achieved with the same size of the reference UWB antenna without an extra area. Measurement results show that the proposed filter-antenna has two notches at the WiMAX systems operating in the 5.8GHz (5.725–5.85GHz) and at the international telecommunication union (ITU) operating in the 8.2GHz (8.025–8.4GHz). Also, it has sharp rejection characteristics at the edges of the federal communication commission (FCC) band for UWB communications. The experimental measurements are in good agreement with theoretical and simulation results for the BSF and the filter-antenna. Moreover, the filter-antenna exhibits stable omnidirectional radiation patterns except at the notched bands.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.022
      Issue No: Vol. 83 (2017)
  • Miniaturization of microstrip loop antenna for wireless applications based
           on metamaterial metasurface
    • Authors: Gohar Varamini; Asghar Keshtkar; Mohammad Naser-Moghadasi
      Pages: 32 - 39
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Gohar Varamini, Asghar Keshtkar, Mohammad Naser-Moghadasi
      The metamaterial and fractal techniques are two main methods for antenna miniaturization and in this paper, we have modeled an especial shape of the antenna based on loop formation with metamaterial load for this aim. The metamaterial layer is made by multi parallel rings and the result shows that the final antenna size reduced drastically while the frequency shifts from 7 to 4GHz. The antenna has Omni-directional pattern with the gain of 3.5 dBi, so the size is reduced around 40%for 4.5GHz and another resonance is made at 2.5GHz with a return lossless than −6dB with more than 60% frequency shift. The reflection and transmission have been utilized for showing the left hand characteristic based on two port periodic simulations in HFSS full wave software. We show that how the metamaterial load can provide the circular polarization (CP) by controlling the current distribution. We also presented that by making slots we obtained the better Axial Ratio (AR) and miniaturized the antenna with reconfigurable qualification. Asa result of fact, we show that by using metasurface we able to miniaturized the antenna and simultaneously achieved the circular polarization.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.024
      Issue No: Vol. 83 (2017)
  • A new low-power current-mode MOS only versatile precision rectifier
    • Authors: Leila Safari; Erkan Yuce; Shahram Minaei
      Pages: 40 - 51
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Leila Safari, Erkan Yuce, Shahram Minaei
      In this paper, a new low-power versatile current-mode rectifier is proposed. Asa salient feature, the proposed rectifier provides two positive half-wave, two inverting negative half-wave or two full-wave outputs from the same configuration. The proposed circuit employs only a dual-output second-generation current conveyor (DO-CCII) and a core rectifying circuit consisting of twelve MOS transistors. The input and output signals are current. Favorably, by adding two additional transistors, the proposed rectifier can also rectify voltage signals with electronic tuning capability. The simple and MOS only structure of the proposed circuit is highly attractive from integration point of view. In spite of providing multiple outputs at the same time, the proposed rectifier enjoys low power consumption. PSPICE simulations using 0.18μm CMOS parameters and supply voltage of ±0.9V demonstrate a precise operation and good temperature stability.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.020
      Issue No: Vol. 83 (2017)
  • A low power and small area digital self-calibration technique for pipeline
    • Authors: Jian Lv; Longcheng Que; Linhai Wei; Zhijun Meng; Yun Zhou
      Pages: 52 - 57
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Jian Lv, Longcheng Que, Linhai Wei, Zhijun Meng, Yun Zhou
      A digital self-calibration implementation with discontinuity-error and gain-error corrections for a pipeline analog-to-digital converter (ADC) is presented. In the proposed calibration method, the error owing to each reference unit capacitor of the multiplying D/A converter is measured separately using a calibration capacitor and an enhanced resolution back-end pipeline ADC acting as an error quantizer. The offset and finite open loop DC-gain of the operational amplifier and capacitor mismatches, the reference voltage mismatch can all be calibrated. The calibration can be achieved by that only used addition and subtraction. Hence, it needs low power and area consuming. A prototype ADC with the proposed calibration was fabricated on a 0.5μm double-poly triple-metal CMOS process. The power consumption and area of the calibration circuit are only 10.1mW and 1.05mm2, respectively. At a sampling rate of 30MS/s, the calibration improves the DNL and INL from 2.59 LSB and 14.98 LSB to 0.72 LSB and 1.82 LSB, respectively. For a 1.25MHz sinusoidal signal, the calibration improves the signal-to-noise-distortion ratio and spurious-free dynamic range from 43.1dB and 52.1dB to 75.51dB and 83.61dB, respectively. The 12.25 effective number of bits at 30MS/s ADC consumes a total power of 136mW.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.025
      Issue No: Vol. 83 (2017)
  • Dual resonance shorted stub circular rings metamaterial absorber
    • Authors: Dhawan Singh; Viranjay M. Srivastava
      Pages: 58 - 66
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Dhawan Singh, Viranjay M. Srivastava
      In this research work, the design characterization of metamaterial absorber (MMA) has been analysed for a unit cell structure of shorted stubs circular rings metamaterial absorber. The simulated results show that dual resonance peaks occur at 17GHz and 18GHz with absorbance peak response of 99.99% and 99.83%, almost unity absorbance. The corresponding full width at half maximum (FWHM) bandwidth at these resonant frequencies are 4.90% and 5.07% respectively. A parametric study has been done to analysed the effect of variation of circular ring radius, shorted stubs length and rectangular bar length upon the resonance frequency. The analysis shows that we can achieve a lower resonant frequency with almost unity absorbance. Moreover, the resonant frequency drifts to lower value without affecting absorbance. The effect at oblique angle of incidence and polarization sensitivity is also considered for both TE and TM modes. So, this unit cell structure acts asa controllable and tunable MMA structure. The dual resonances MMA structure are becoming a prime technology for many present and future wireless communication systems such as radar cross section (RCS) reduction for stealth technology, satellite navigation systems, radar frequency identification and wireless handheld devices.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.034
      Issue No: Vol. 83 (2017)
  • Reconnoiter the leavening of skin-deep insulated extension on analog
           performance of RingFET (SDIE-RingFET)
    • Authors: Sachin Kumar; Vandana Kumari; Sanjeev Singh; Manoj Saxena; Mridula Gupta
      Pages: 67 - 72
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Sachin Kumar, Vandana Kumari, Sanjeev Singh, Manoj Saxena, Mridula Gupta
      In the present work, a novel device architecture Skin Deep Insulated Extension-RingFET (i.e. SDIE-RingFET) has been reported that incorporates the better known dielectric pocket in RingFET architecture. Various analog performance matrices like ION/IOFF, Vth roll off, Sub-threshold slope (SS), Device efficiency (gm/Ids), conduction band energy (CBE) and electron temperature (TE) have been studied to investigate the impact of Skin Deep Insulated Extension (SDIE) on RingFET architecture. Insulated extension enhances the immunity of the device against Short Channel Effects by reducing IOFF and providing a higher ION/IOFF ratio apart from improved threshold voltage roll-off. In addition, SDIE also prevents dopant diffusion from source/drain to bulk, thereby alleviating the bulk punch-through effect and hence DIBL.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.07.038
      Issue No: Vol. 83 (2017)
  • Optimization of rotary transformer for RUM with secondary
    • Authors: Liping Liu; Bin Lin; Xueming Zhu
      Pages: 73 - 80
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Liping Liu, Bin Lin, Xueming Zhu
      In rotary ultrasonic machining (RUM), the rotary transformer can replace the well-established slip ring technology to supply contactless power for the revolving transducer. Such contactless energy transfer (CET) is safe and high rotation speed of the spindle is permissible. However, the transfer efficiency and output power are usually a pair of contradictions. In this paper, the self-compensation method is adopted on secondary side in order to improve the dynamic balance of the revolving part. Considering the distinct capacitive behavior of the transducer, two primary compensation topologies are given. The mathematical models are presented to identify the power transfer efficiency, transfer capability and load impedance of rotary transformer used in RUM. The effects of coil turns on transfer efficiency and load resistance are researched. An optimization method of rotary transformer used in RUM is put forward. A contactless power supply RUM system that can produce high speed, high efficiency and high output power is therefore possible.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.038
      Issue No: Vol. 83 (2017)
  • A novel approach for optimal design of multilayer wideband microwave
           absorber using wind driven optimization technique
    • Authors: Prakash Ranjan; Arvind Choubey; Santosh Kumar Mahto
      Pages: 81 - 87
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Prakash Ranjan, Arvind Choubey, Santosh Kumar Mahto
      In general, cost function for optimal design of multilayer microwave absorbers found in literature had not taken account of normal and oblique incidence (TE & TM polarization) of wave in optimization problem which leads to sub-optimal design limited only for particular incidence of wave, either a normal or oblique incidence of wave at a time. To overcome the above problem, this paper focuses on optimal design of multilayer absorbers through a proposed cost function which can work for both normal and oblique incidence of wave up to wide angle of incidence (0–60°) with TE & TM polarization simultaneously. The objective of this optimization process is to reduce maximum reflection coefficient of the absorber by selecting suitable layers of materials from the available database in literature and optimize the total thickness to possible minimum level. Five models of four layer multilayer absorbers are proposed using WDO algorithm for different frequency bands (ranging from 2–8, 8–12, 12–18, 2–12 and 2–18GHz). A detailed analysis are done and it shows that the application of WDO yields improved numerical results in terms of thickness and oblique incidence of wave as compared with the earlier reported results.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.039
      Issue No: Vol. 83 (2017)
  • A compact metamaterial loaded monopole antenna with offset-fed microstrip
           line for wireless applications
    • Authors: R Samson Daniel; R Pandeeswari; S Raghavan
      Pages: 88 - 94
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): R Samson Daniel, R Pandeeswari, S Raghavan
      A compact metamaterial loaded monopole antenna with offset-fed microstrip line is proposed for Universal Mobile Telecommunication System (UMTS), Worldwide interoperability for Microwave Access (WiMAX), and Wireless Local Area Network (WLAN) wireless applications. The proposed antenna is printed on a 19.18×22.64×1.6mm3 FR-4 substrate having a dielectric constant ( ε r ) of 4.4. The antenna radiating element consists of split ring structure and CSRR for generating multiband characteristics, which is fed by offset microstrip line. A split in the outer vertical arm creates a lower order resonance at 2.1GHz and the Complementary Split Ring Resonator (CSRR) in the monopole antenna is used to generate a new resonance frequency of 3.45GHz. The precise equivalent circuit design equations are used to analyze the CSRR resonance frequency. Also, the band characteristics of a split ring structure and CSRR are enlightened in detail to verify the metamaterial property. Simulated results are verified with measured results. The measured azimuthal plane (H-Plane) exhibits omnidirectional radiation pattern and elevation plane (E-plane) represents a bidirectional radiation pattern.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.030
      Issue No: Vol. 83 (2017)
  • Dynamic programming based adaptive step integration method for maneuvering
           fluctuating target detection
    • Authors: Shuailin Chen; Feng Luo; Linrang Zhang; Chong Hu; Shichao Chen
      Pages: 95 - 99
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Shuailin Chen, Feng Luo, Linrang Zhang, Chong Hu, Shichao Chen
      An adaptive long time integration method based on dynamic programming (DP) is proposed for the detection of high speed maneuvering fluctuating targets. The proposed method is aimed at detecting a target with an unpredictable range migration and fluctuating echoes by jointly applying three main ideas: the improved DP procedure that could search the maneuver position and velocity at each frame; the multi-pulse integration that could suppress the influence of fluctuation; and the adaptive step with fading factor that could allow the integration time to be suitable for each searching velocity. Compared with the existing methods, the target energy could be integrated along its trajectory using the proposed method without estimating the specific motion parameters, which makes the proposed method applicable to a target with arbitrary motion. Simulation results and performance comparisons show the superiority of the proposed method.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.015
      Issue No: Vol. 83 (2017)
  • Energy efficient power allocation for co-located antenna systems with D2D
    • Authors: Xingquan Li; Chunlong He; Lei Huang; Ce Zhang; Jihong Zhang
      Pages: 100 - 105
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Xingquan Li, Chunlong He, Lei Huang, Ce Zhang, Jihong Zhang
      This paper investigates the energy efficient resource allocation when adding dedicated device-to-device (D2D) communication in the co-located antenna systems (CAS). We consider the user equipments (UEs) are changing over time and the appropriate potential UEs to form D2D pairs are varying with time. Our optimization objective is to maximize the system’s energy efficiency (EE) with the constraints of the maximum transmit power of UEs and D2D pairs in different total power consumption models. Firstly, an algorithm is developed to choose appropriate potential UEs to form D2D pairs in this paper. Then we exploit fractional programming method to obtain optimal energy efficient power allocation solutions. Simulation results are provided to demonstrate the effectiveness of the developed D2D pairs choosing algorithm and the power allocation algorithm.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.07.027
      Issue No: Vol. 83 (2017)
  • Low complexity layered tabu search detection in large MIMO systems
    • Authors: Madurakavi Karthikeyan; Djagadeesan Saraswady
      Pages: 106 - 113
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Madurakavi Karthikeyan, Djagadeesan Saraswady
      In this paper, a layered tabu search (LTS) algorithm for a complex-valued channel matrix (LTS-C) is developed to provide optimal detection in large MIMO systems. The proposed LTS-C algorithm works directly on the complex-valued channel matrix rather than converting it to a real-valued matrix. The contribution of this paper is twofold. First, we propose a novel neighborhood approach based on a signal constellation graph to obtain a set of neighborhoods for the given complex-valued initial vector. Second, the tabu matrix structure is changed to track complex-valued moves. The proposed structure significantly reduces the size of the tabu matrix. Our simulation results show that the complexity reduction is substantial in the LTS-C algorithm over the LTS algorithm. In particular, LTS-C is able to achieve approximately 45–50% and 93–94% of complexity reduction in terms of the number of real operations for 16 × 16 and 32 × 32 MIMO systems, respectively.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.042
      Issue No: Vol. 83 (2017)
  • Low phase noise LC VCO with sinusoidal tail current shaping using cascode
           current source
    • Authors: Bahram Jafari; Samad Sheikhaei
      Pages: 114 - 122
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Bahram Jafari, Samad Sheikhaei
      Tail current shaping is a known technique for phase noise reduction. According to this technique, close to outputs zero crossing points, where Impulse Sensitivity Function (ISF) is maximum, current supplying path to the transistor pair is disconnected. In this paper, tail current shaping is performed by two additional transistors that are placed in cascode configuration with the tail current source. Conventional tail current shaping is performed by two tail transistors with the gates connected to the oscillator outputs. The proposed circuit outperforms the conventional circuit in phase noise performance, due to four mechanisms: higher impedance seen from the common source of switching transistors due to cascode current source; better tail current shaping; higher oscillation amplitude with the same power consumption; and lower RMS value of the effective ISF. Also, the proposed circuit presents more stable bias point and output amplitude, compared to conventional circuit. In addition, higher ratio of start-up tail current to the minimum of shaped tail current for the proposed circuit, removes the need for additional start-up detection circuits. Post layout simulations predict a sample oscillator designed at 4GHz in 0.18µm RF CMOS technology presents 11.3 and 3.8dB less phase noise at 1MHz offset, compared to simple and conventional oscillators, respectively.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.032
      Issue No: Vol. 83 (2017)
  • Dispersion characteristics of dielectric tube waveguide loaded with plasma
           for leaky wave antenna application
    • Authors: Rasila R. Hirani; Surya K. Pathak; Shweta N. Shah; Dushyant K. Sharma
      Pages: 123 - 130
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Rasila R. Hirani, Surya K. Pathak, Shweta N. Shah, Dushyant K. Sharma
      The leaky mode dispersion characteristics ( ω - β ) of a Dielectric Tube Waveguide Loaded with Plasma (DTWLP) is analytically solved and numerically computed using Muller’s complex root search algorithm with an aim to define its complex propagation constant behaviour. Consequently, complex leaky mode characteristics and its classification as guided mode, reactive mode and antenna mode have been investigated. These modal characteristics reveal wide fundamental antenna mode (TM01) with the variation in plasma density, which can find prospective application in high resolution radar and communication system where “re-tuning” of the antenna to a new frequency or making it electrically invisible is required. A computational cum simulation study is also performed using CST Microwave Studio software, which confirms our analytical findings.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.019
      Issue No: Vol. 83 (2017)
  • Inverting voltage buffer based lossless grounded inductor simulators
    • Authors: Abdullah Yesil; Erkan Yuce; Shahram Minaei
      Pages: 131 - 137
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Abdullah Yesil, Erkan Yuce, Shahram Minaei
      In this study, two new lossless grounded inductor simulators (GISs) made up of a single plus-type second-generation current conveyor, two inverting voltage buffers and a minimum number of passive components are proposed. There is no requirement of matching conditions and cancellation constraints among passive elements of the proposed GISs. Nevertheless, both of the proposed GISs have a floating capacitor which can be easily realized in nowadays integrated circuit fabrication. A second-order voltage-mode band-pass filter application is given for the proposed lossless GISs. A number of simulations based on SPICE program are given so as to verify the theory.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.026
      Issue No: Vol. 83 (2017)
  • A 1.8V 3GS/s 7-bit time-interleaved Quasi C-2C SAR ADC using
           voltage-comparator time-information
    • Authors: Hamed Nasiri; Abdolreza Nabavi
      Pages: 138 - 149
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Hamed Nasiri, Abdolreza Nabavi
      This paper presents a 7-bit 15×interleaved SAR ADC that operates up to 3GS/s, using 180nm CMOS technology. The ADC utilizes the transient information of a dynamic SAR voltage-comparator to resolve 2bits per clock cycle, using a time-comparator block. Thus, only 5 clock cycles are needed to resolve 7bits. This results in speed improvement of about 60%, compared to conventional ADC. Also, an improved Quasi C-2C DAC structure with reduced internal node swing and reduced switching activity are utilized, which decreases the power consumption of DAC up to 65%. We employ the above techniques in designing a 7-bit SAR ADC, in which 3bits are resolved with time-comparator blocks and 4bits are resolved with a voltage-comparator. To calibrate the proposed time-comparator block, a calibration process is proposed. ADS simulation of the ADC illustrates an ENOB (Effective Number of Bits)>6.5-bit and SFDR (Spur Free Dynamic Range)=−52.8 dBc for a single SAR converter with sampling at 200MS/s. For the time-interleaved SAR ADC with 15 single SAR converters, ENOB is 6.15-bit and SFDR=−45 dBc with sampling at 3GS/s up to Nyquist frequency. This ADC consumes 150mW at 1.8V supply and achieves a Figure-of-Merit (FoM) of 700 fJ/conv-step.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.028
      Issue No: Vol. 83 (2017)
  • A robust adaptive weighted constant modulus algorithm for blind
           equalization of wireless communications systems under impulsive noise
    • Authors: Jin Li; Da-Zheng Feng; Bingbing Li
      Pages: 150 - 155
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Jin Li, Da-Zheng Feng, Bingbing Li
      A robust adaptive weighted constant modulus algorithm is proposed for blind equalization of wireless communication systems under impulsive noise environment. The influence of the impulsive noise is analyzed based on numerical analysis method. Then an adaptive weighted constant modulus algorithm is constructed to adaptively suppress impulsive noise. Theoretical analysis is provided to illustrate that the proposed algorithm has a robust equalization performance since the impulsive noise is adaptively suppressed. Moreover, the proposed algorithm has stable and quick convergence due to avoidance of large misadjuntment and adoption of large step size. Simulation results are presented to show the robust equalization performance and the fast convergence speed of the proposed algorithm under both impulsive noise and Gaussian noise environments.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.036
      Issue No: Vol. 83 (2017)
  • Research on dual-polarized circular waveguide antenna fed by L-shaped
    • Authors: Lizhong Song; Luxi He
      Pages: 156 - 167
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Lizhong Song, Luxi He
      This paper researched a kind of dual-polarized and cylindrical waveguide antenna fed by two L-shaped probes at the antenna bottom. The designed antenna was composed of two orthogonal L-shaped coaxial probes and a cylindrical waveguide cavity. The two orthogonal field structures were excited and the dual-polarized radiation mode was formed. The feeding cables of two polarization ports went through the bottom of the cylindrical cavity and were connected with the microwave adaptors. The bottom feeding structure was suitable to constitute a planar antenna array. The electromagnetic simulation and optimization design of the proposed antenna were carried out by using the full wave electromagnetic simulation technique, and the simulation results showed that the isolation between two polarization ports were more than 20dB within the frequency range of 4.8–5.4GHz. At the center frequency, the cross-polarization levels of radiation pattern were lower than −21dB at the boresights and the beam width of radiation patterns at E-plane and H-plane were more than 70° for two polarization ports. The designed antenna in this paper was fabricated and measured. The measurement results indicated that the designed antenna achieved anticipated radiation performances and design effectiveness of the dual-polarized antenna in this paper was proved. The dual-polarized and cylindrical waveguide antenna is suitable for some application fields such as dual-polarized array radar. The research results in this paper can provide a technical basis for the practical engineering application.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.023
      Issue No: Vol. 83 (2017)
  • Realization of current-mode biquadratic filter employing multiple output
           OTAs and MO-CCII
    • Authors: Karima Garradhi; Néjib Hassen; Thouraya Ettaghzouti; Kamel Besbes
      Pages: 168 - 179
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Karima Garradhi, Néjib Hassen, Thouraya Ettaghzouti, Kamel Besbes
      This paper presents a low voltage low power operational transconductance amplifier circuit. By using a source degeneration technique, the proposed realization powered at ±0.9V shows a high DC gain of 63dB with a unity gain frequency at 3.5MHz, a wide dynamic range and a total harmonic distortion of −60dB at 1MHz for an input of 1Vpp. According to the connection of negative current terminal to positive voltage terminal of double output OTA circuit, a second generation current conveyor (CCII-) has been realized. This circuit offers a good linearity over the dynamic range, an excellent accuracy and wide current mode of 56MHz and voltage mode of 16.78MHz cut-off frequency f-3dB. Thereafter, new SIMO current-mode biquadratic filter composed by OTA and CCII as active elements and two grounded capacitors is implemented. This filter is characterized by (i) independent adjusting of pole frequency and quality factor, (ii) it can realize all simulations results without changing the circuit topology, (iii) it shows low power consumption about 0.24mW. All simulations are performed by Cadence (Cadence Design Systems) technology Tower Jazz 0.18μm TS18SL.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.027
      Issue No: Vol. 83 (2017)
  • Scalable α-power law based MOSFET model for characterization of ultra
           deep submicron digital integrated circuit design
    • Authors: Shruti Kalra; AB Bhattacharyya
      Pages: 180 - 187
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Shruti Kalra, AB Bhattacharyya
      Analytical circuit design, optimization, characterization and development of design methodology for digital circuits using nanoscale CMOS devices require compact equations. Such equations need to include first order short channel phenomena relevant to the nanoscale technology nodes being used. The present paper demonstrates that α -power model can be updated to include velocity overshoot necessary to characterize devices at ultradeep submicron technology nodes. Further, the three α -power model parameters (velocity saturation index α , transconductance parameter K1 and threshold voltage V th ) expressing MOSFET drain current has been expressed in terms of predictive technology model (PTM) parameters. Representative basic CMOS cells belonging both to inverter and transmission gate categories have been analytically characterized using the updated α -power model up to ultradeep submicron technology node with BSIM verification. It has been shown that consideration of velocity overshoot is important for accurate prediction below 40nm.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.029
      Issue No: Vol. 83 (2017)
  • A CPW-fed broadband quasi-Yagi antenna with low cross-polarization
    • Authors: Xuefeng Zhao; Yongjun Huang; Xiaolin Xue; Guangjun Wen
      Pages: 188 - 192
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Xuefeng Zhao, Yongjun Huang, Xiaolin Xue, Guangjun Wen
      This paper presents a uniplanar quasi-Yagi antenna with the coplanar waveguide feed line. A novel driver dipole is proposed to expand the working frequency band of the antenna. Due to the unique driver dipole, the proposed quasi-Yagi antenna can work from 3.75 to 10.4GHz with good end-fire radiation gain ( > 4 dBi) and low cross-polarization performances. To verify the design, a prototype antenna is fabricated and measured. The experimental results are in accordance with the simulation results very well.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.050
      Issue No: Vol. 83 (2017)
  • An energy efficient and QoS aware routing protocol for wireless sensor and
           actuator networks
    • Authors: Souraya Yahiaoui; Mawloud Omar; Abdelmadjid Bouabdallah; Enrico Natalizio; Yacine Challal
      Pages: 193 - 203
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Souraya Yahiaoui, Mawloud Omar, Abdelmadjid Bouabdallah, Enrico Natalizio, Yacine Challal
      Wireless sensor and actuator networks are composed of sensor and actuator nodes interconnected via wireless links. The actuators are responsible for taking prompt decisions and react accordingly to the data gathered by sensor nodes. In order to ensure efficient actions in such networks, we propose a new routing protocol that provides QoS in terms of delay and energy consumption. The network is organized in clusters supervised by CHs (Cluster-Heads), elected according to important metrics, namely the energy capability, the riches of connectivity, which is used to select the CH with high node density, and the accessibility degree regarding all the actuators. The latter metric is the distance in number of hops of sensor nodes relative to the actuator nodes. This metric enhances more the network reliability by reducing the communication delay when alerting the actuator nodes, and hence, reducing the energy consumption. To reach efficiently the actuator nodes, we design a delay and energy sensitive routing protocol based on-demand routing approach. Our protocol incurs less delay and is energy efficient. We perform an evaluation of our approach through simulations. The obtained results show out performance of our approach while providing effective gain in terms of communication delay and energy consumption.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.045
      Issue No: Vol. 83 (2017)
  • Low power dynamic circuit for power efficient bit lines
    • Authors: Mohammad Asyaei; Emad Ebrahimi
      Pages: 204 - 212
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Mohammad Asyaei, Emad Ebrahimi
      In this paper, a low power dynamic circuit is presented to reduce the power consumption of bit lines in multi-port memories. Using the proposed circuit, the voltage swing of the pull-down network is lowered to reduce the power consumption of wide fan-in gates employed in memory’s bit lines. Wide fan-in OR gates are designed and simulated using the proposed dynamic circuit in 90nm CMOS technology. Simulation results show at least 40% reduction of power consumption and 1.2X noise immunity improvement compared to the conventional dynamic circuits at the same delay. Exploiting the proposed dynamic circuit, wide fan-in multiplexers are also designed. The multiplexers are simulated using a 90nm CMOS model in all process corners. The results show 41% power reduction and 27% speed improvement for the proposed 128-input multiplexer in comparison with the conventional multiplexer at the same noise immunity.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.048
      Issue No: Vol. 83 (2017)
  • Compact and miniaturized microstrip antenna based on fractal and
           metamaterial loads with reconfigurable qualification
    • Authors: Gohar Varamini; Asghar Keshtkar; Mohammad Naser-Moghadasi
      Pages: 213 - 221
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Gohar Varamini, Asghar Keshtkar, Mohammad Naser-Moghadasi
      We have described a compact antenna based on fractal and metamaterial loads techniques. The microstrip patch antenna is assumed asa basic antenna and then the effect of fractal structures is implemented. The fractal patch is considered asa right-handed element and then by adding a left-handed element, the antenna miniaturization is achieved by using the metamaterial loads technique. The equivalent circuit is also used to describe the element effect on miniaturization and parametric models clarify them. The proposed antenna is modified for wireless applications and experimental results confirm our simulation results. In addition, we show that the proposed antenna is suitable for reconfigurable. By joining the unit cells together with various arrangements and changing the effective length, the various inductances can be obtained. Finally, by adding reconfigurable characteristic to the proposed antenna, the gain and radiation pattern can be controlled as shows in this paper. The patch antenna has low bandwidth and gain and so we have developed the patch antenna with defected ground to improve the bandwidth and the Frequency Selective Surface (FSS) is used to achieve higher gain and bandwidth. The final antenna is covering 2.4, 3.5 and 5.5GHz with higher gain than the patch antenna.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.057
      Issue No: Vol. 83 (2017)
  • A printed monopole ellipzoidal UWB antenna with four band rejection
    • Authors: Hari Shankar Mewara; Deepak Jhanwar; Mahendra Mohan Sharma; Jitendra Kumar Deegwal
      Pages: 222 - 232
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Hari Shankar Mewara, Deepak Jhanwar, Mahendra Mohan Sharma, Jitendra Kumar Deegwal
      An antenna design with four band rejection characteristics for UWB application is demonstrated. The proposed unique UWB antenna has shape of an embedded ellipse at top of trapezoidal patch (named as ellipzoidal), 50Ω impedance microstrip line feed and a truncated beveled ground plane. To realize four band stop characteristics, three inverted U-shaped and a single I-shaped slots each of half guided wavelength are utilized on radiating element. The fabricated antenna has dimensions of 27mm×36mm×1.6mm. This four band notched ellipzoidal UWB antenna has measured frequency bandwidth 2.8–14GHz for magnitude of S11 <−10dB level. The measured ellipzoidal antenna exhibits four band rejection characteristics for magnitude of S11 >−10dB at 3.55GHz for WiMAX band (3.26–3.9GHz), 4.55GHz for ARN band (4.35–5.05GHz), 5.7GHz for WLAN band (5.5–6.65GHz) and 8.8GHz for ITU-8 band (7.95–9.35GHz). The proposed ellipzoidal UWB antenna maintains omnidirectional radiation pattern, gain, linear phase response, <1ns group delay, and transfer function in the whole UWB operating bandwidth except at notched frequency bands.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.043
      Issue No: Vol. 83 (2017)
  • Miniaturized active stepped impedance planar inverted-F antenna using
           common ground
    • Authors: Ashok Gundumalla; Sachin Agrawal; Manoj Singh Parihar
      Pages: 233 - 239
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Ashok Gundumalla, Sachin Agrawal, Manoj Singh Parihar
      This paper presents a compact active integrated antenna (AIA) comprising of class-A power amplifier (PA) and stepped impedance planar inverted-F antenna (PIFA). In the proposed design, a common ground is used for both PA and PIFA, resulting a compact antenna of size 0.14λ0 ×0.11λ0 ×0.01λ0 (λ0 is free space wavelength at 0.85GHz). Moreover, it is demonstrated that by using the stepped impedance radiator the operating frequency of the active PIFA is shifted down from its natural resonant frequency of 1.36GHz to 0.85GHz, offering an extensive size reduction of 80%. This active integration increases the passive antenna gain through the effective loading of the antenna to the power amplifier. The measured result indicates that the active and passive antennas achieved the gain of 15.7dB and 3.81dBi, respectively after the integration. In addition, the maximum SAR value of antenna is found to be 0.64W/kg.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.08.041
      Issue No: Vol. 83 (2017)
  • A short broadband monopole antenna
    • Authors: Omid Manoochehri; Mohammad Ali Salari; Amin Darvazehban
      Pages: 240 - 244
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Omid Manoochehri, Mohammad Ali Salari, Amin Darvazehban
      A novel design procedure is proposed to overcome the narrow bandwidth characteristic of the monopole antenna. Having sections with different lengths and radii as well as adding loads at two points along the antenna makes it permissible to optimize the radiation efficiency and bandwidth of the monopole antenna. Particle swarm optimization (PSO) technique is used to determine the load values, their respective locations and the elements of the matching network. A bandwidth ratio of 5:l within the frequency range of 100–500MHz is achieved. The total length of the antenna is 35cm and the matching network is capable of handling RF power up to 100W. The whole system is simulated with CST and ADS software. Measurement results of the fabricated antenna are in good agreement with simulations.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.09.007
      Issue No: Vol. 83 (2017)
  • On deception jamming for countering LFM radar based on periodic 0-π
           phase modulation
    • Authors: Qingzhan Shi; Ning Tai; Chao Wang; Naichang Yuan
      Pages: 245 - 252
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Qingzhan Shi, Ning Tai, Chao Wang, Naichang Yuan
      Coherent jamming technology is one of the most important development trends in the modern radar countermeasures. This study presents a method capable of generating a series of deceptive coherent false targets for countering linear frequency modulation (LFM) radar based on periodic 0-π phase modulation. Utilizing the structure of digital radio frequency memory (DRFM), we impose phase modulation onto the intercepted radar signal and retransmit it to the victim radar. The jamming signal model is developed and its characteristics are analyzed in detail. An investigation has been carried out to determine the matched filter properties of the jamming signal. The expressions of some main parameters are deduced step by step. Theoretical analysis and simulation results prove that by flexibly adjusting the phase modulation parameters, different deception jamming effects will be obtained. The proposed method provides an idea for the coherent jamming signal design.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.09.010
      Issue No: Vol. 83 (2017)
  • Time domain analysis for foldable thin UWB monopole antenna
    • Authors: Sherif R. Zahran; Mahmoud A. Abdalla; Abdelhamid Gaafar
      Pages: 253 - 262
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Sherif R. Zahran, Mahmoud A. Abdalla, Abdelhamid Gaafar
      In this paper, the time domain analysis of an Ultra Wide Band antenna flexible circular monopole antenna is presented. The antenna is fabricated on liquid crystalline polymer flexible substrate with a compact geometry that makes it suitable for wearable applications under different bending conditions. The antenna is fed by coplanar waveguide transmission line and has a compact total size of 40×22mm2. Moreover, the antenna has good radiation efficiency (97%) over the bandwidth. The presented antenna has a good performance over the operating spectrum for straight and bending configurations. The design principals along with simulation and experimental results are presented in this contribution.

      PubDate: 2017-09-23T22:12:44Z
      DOI: 10.1016/j.aeue.2017.09.006
      Issue No: Vol. 83 (2017)
  • Impact of co-channel interference on the performance of VANETs under
           α-μ fading
    • Authors: Furqan Jameel; Zara Hamid; Farhana Jabeen; Muhammad Awais Javed
      Pages: 263 - 269
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Furqan Jameel, Zara Hamid, Farhana Jabeen, Muhammad Awais Javed
      Vehicular Ad hoc Networks (VANETs) are considered to be a novel solution for provisioning of infotainment services and reduction of accidents on the road. However, communication in VANETs is significantly hampered by multipath fading and co-channel interference. In this context, we analytically model VANETs based on the well-known cluster model. The closed form expression for packet error probability is derived in the presence of co-channel interference under α - μ fading. Impact of α and μ on interference is also characterized in detail. We also incorporate the impact of channel estimation errors of main and interfering link to provide more realistic evaluation of packet error probability. We then provide performance evaluation of VANETs under cooperative communication and quantify the improvements in the performance of cluster. We also evaluate the importance of fading parameters α and μ in the presence of interfering signal from nearby cluster. Our findings disclose that an error floor is introduced at high signal-to-noise-ratio (SNR) due to imperfect channel estimation. Additionally, the error probability considerably reduces by applying cooperative scheduling. Extensive simulations are performed in MATLAB to validate our results, which also prove the practicality of our analytical model.

      PubDate: 2017-09-29T21:03:47Z
      DOI: 10.1016/j.aeue.2017.09.004
      Issue No: Vol. 83 (2017)
  • Design of ultra low power current mode logic gates using magnetic cells
    • Authors: Vahid Jamshidi; Mahdi Fazeli
      Pages: 270 - 279
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Vahid Jamshidi, Mahdi Fazeli
      Non-volatile logic is a viable solution to overcome the leakage power issue which has become a major obstacle to CMOS technology scaling. Magnetic tunnel junction (MTJ)-based logic is a promising approach because of the non-volatility, less occupied area, almost zero static power consumption, programmability. This paper presents current mode logic gates using MTJ elements without any intermediate electronic circuitry. This efficient solution reduces the performance overheads of the spintronic logic circuits while simplifying fabrication. Hspice based simulations have been carried out to verify the performance of different logic gates. The simulation results reveal that the SBEG based gates provide less area, power consumption, and energy while also offering less design complexity as compared to mLogic (previously proposed magnetic logic) and CMOS gates.

      PubDate: 2017-09-29T21:03:47Z
      DOI: 10.1016/j.aeue.2017.09.009
      Issue No: Vol. 83 (2017)
  • Design of a compact planar wide band antenna family
    • Authors: Ali Nooraei Yeganeh; Sayed Hesamoddin Najmolhoda; Seyed Hassan Sedighy; Sajad Mohammd-Ali-Nezhad
      Pages: 280 - 287
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Ali Nooraei Yeganeh, Sayed Hesamoddin Najmolhoda, Seyed Hassan Sedighy, Sajad Mohammd-Ali-Nezhad
      A new family of compact planar wide band antennas is proposed. These simple and planar antennas have stable omnidirectional patterns and flat gain in the whole of bandwidth. Five types of these antennas are designed and simulated to clarify the ability of these introduced antenna family. Also, one of these antennas is fabricated and tested. The simulation and the measurement results are in good agreement. The measurement results show that this antenna works between 1.91 and 5.25GHz (93.3% bandwidth) and it has a very compact dimensions. Also, the antenna analysis results show that the antenna center frequency and bandwidth can easily controlled by changing the scale factor and section factor, respectively. Finally, the antennas comparison results with the references verify the capability and power of them.

      PubDate: 2017-09-29T21:03:47Z
      DOI: 10.1016/j.aeue.2017.09.011
      Issue No: Vol. 83 (2017)
  • A 0.1–1GHz low power RF receiver front-end with noise cancellation
           technique for WSN applications
    • Authors: Zhiqun Li; Guoxiao Cheng; Zengqi Wang
      Pages: 288 - 294
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Zhiqun Li, Guoxiao Cheng, Zengqi Wang
      A low power 0.1–1GHz RF receiver front-end composed of noise-cancelling trans-conductor stage and I/Q switch stage was presented in this paper. The RF receiver front-end chip was fabricated in 0.18µm RF CMOS. Measurement results show the receiver front-end has a conversion gain of 28.1dB at high gain mode, and the single-sideband (SSB) noise figure is 6.2dB. In the low gain mode, the conversion gain of the receiver front-end is 15.5dB and the IP1dB is −12dBm. In this design, low power consumption and low cost is achieved by current-reuse and inductor-less topology. The receiver front-end consumes only 5.2mW from a 1.8V DC supply and the chip size of the core circuit is 0.12mm2.

      PubDate: 2017-10-07T22:30:27Z
      DOI: 10.1016/j.aeue.2017.07.011
      Issue No: Vol. 83 (2017)
  • A regularization approach to MSE analysis of OFDM under phase noise
    • Authors: Ömer Kakşi; Özgür Özdemir; Ridha Hamila; Naofal Al-Dhahir
      Pages: 303 - 308
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Ömer Kakşi, Özgür Özdemir, Ridha Hamila, Naofal Al-Dhahir
      Orthogonal frequency division multiplexing (OFDM) is widely used in broadband wireless communications systems because of its high resilience to frequency-selective fading and its low implementation complexity. Phase noise (PN) is one of the major RF impairments in direct-conversion wireless transceivers. In this paper, we analyze the impact of PN on an OFDM transceiver. We derive an exact normalized mean square error (NMSE) expression under receive-side PN and examine asymptotic and special cases. An optimized regularization parameter for an MMSE equalizer design is derived and shown to result in appreciable NMSE reduction.

      PubDate: 2017-10-07T22:30:27Z
      DOI: 10.1016/j.aeue.2017.09.005
      Issue No: Vol. 83 (2017)
  • A comprehensive performance analysis of relay-aided CDMA communications
           over dissimilar fading channels
    • Authors: Nuri Kapucu; Mehmet Bilim; Ibrahim Develi
      Pages: 339 - 347
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Nuri Kapucu, Mehmet Bilim, Ibrahim Develi
      In this paper, bit error probability (BEP), outage probability (OP) and channel capacity (CC) of direct-sequence code-division multiple access systems with amplify-and-forward relaying are presented for different fading scenarios. In the first scenario, the source-destination link is assumed to experience Rayleigh fading while it is subject to Nakagami-m fading in the second scenario. The source-relay and relay-destination channels are considered to have Nakagami-m fading conditions in two scenarios. First, analytical expressions for the end-to-end probability density function (PDF) are derived by using the convolution integral. Then, BEP, OP and CC are obtained based on these PDFs in terms of infinite series. Truncation error analyses are presented for different parameter values in order to show that truncation error arising from the infinite series is negligible. Simple and easy-to-compute asymptotic expressions are also introduced for BEP and OP in order to simplify the performance analysis in high signal-to-noise ratio region. Simulation results are provided to show the accuracy of the proposed approximate and asymptotic expressions.

      PubDate: 2017-10-14T14:19:45Z
      DOI: 10.1016/j.aeue.2017.09.017
      Issue No: Vol. 83 (2017)
  • An X-band dielectric resonator antenna using a single elliptical shaped
           dielectric resonator
    • Authors: Riya Chakraborty; Manimala Pal; Rowdra Ghatak
      Pages: 348 - 352
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Riya Chakraborty, Manimala Pal, Rowdra Ghatak
      This paper presents design evolution of a single elliptical dielectric resonator antenna to achieve wide measured impedance band-width extending from 8.26 GHz to 12.15 GHz. Design evolved from a right circular cylindrical DRA by varying the dimension along the semi-minor axis and thereby resulting in an elliptical DRA that supports near similar field distribution over the X-band. This similar field variation is achieved by tuning the eccentricity of the elliptical geometry, the feed position as well as height of the DRA. A fabricated prototype is developed and measured results agree well with that obtained from simulation. Apart from wide impedance bandwidth, the observed pattern bandwidth is also similar.

      PubDate: 2017-10-14T14:19:45Z
      DOI: 10.1016/j.aeue.2017.10.001
      Issue No: Vol. 83 (2017)
  • Joint angular and spectral estimation technique using nonlinear Kalman
           filters for cognitive radio
    • Authors: Samar Elaraby; Heba Y. Soliman; Heba M. Abdel-Atty; Mohamed A. Mohamed
      Pages: 359 - 365
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Samar Elaraby, Heba Y. Soliman, Heba M. Abdel-Atty, Mohamed A. Mohamed
      The joint estimation of direction of arrivals (DOA) and carrier frequencies of band-limited source signals is considered in this paper. A novel technique based on nonlinear Kalman filters is proposed for this joint angular and spectral estimation problem for cognitive radio (CR). Since sampling a wideband spectrum at Nyquist rate increases the analog-to-digital converter (ADC) requirements, we propose executing Kalman filter algorithm over a spatial state space model. Thus, one time sample is required and hardware complexity is reduced. Two types of nonlinear Kalman filters, extended Kalman filter (EKF) and unscented Kalman filter (UKF), are proposed. We consider their sub-optimal performance and show how to control their convergence. However, the proposed algorithms can detect a number of source signals limited to the number of elements in employing arrays.

      PubDate: 2017-10-14T14:19:45Z
      DOI: 10.1016/j.aeue.2017.10.007
      Issue No: Vol. 83 (2017)
  • A high performance differential input CMOS current buffer
    • Authors: Emre Arslan
      Pages: 1 - 6
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Emre Arslan
      In this paper, a high accuracy CMOS differential input current buffer (CB) is proposed which employs super source followers (SSF) as input stage and regulated cascode (RGC) current mirrors as output stage. High accuracy requires very high output resistance and low input resistance. Small signal analysis is performed and it is shown that the proposed CB circuit has very low input impedances at ports n and p due to SSF transistors and also very high output impedance at output port due to RGC current mirrors. The simulation results show 9.72Ω input resistances at ports n and p, 454MΩ output resistance at output port with only 625μW power consumption under ±0.9V power supplies. The simulations are performed with HSpice using TSMC 0.18μm process parameters and it is shown that the simulation results are in very good agreement with the theoretical ones.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.07.037
      Issue No: Vol. 82 (2017)
  • A compact double-sided MIMO antenna with an improved isolation for UWB
    • Authors: Wael A.E. Ali; Ahmed A. Ibrahim
      Pages: 7 - 13
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Wael A.E. Ali, Ahmed A. Ibrahim
      This paper presents compact size 4×4cm2 MIMO antenna for UWB applications. The proposed antenna consists of four symmetric circular elements printed on low cost FR4 substrate with partial slotted ground plane. The two sides of the substrate are symmetric and each side is consisting of two radiators with the partial ground planes associated to the two other elements mounted on the other side. The two elements of the front side are orthogonal to the two other elements of the back side in order to increase the isolation between elements. For further reduction in the mutual coupling between elements, decoupling structures are presented in the top and bottom layers of the substrate. The simulated and measured results are investigated to study the effectiveness of the MIMO-UWB antenna. The results demonstrate the satisfactory performance of MIMO-UWB antenna, which has a return loss less than −10dB from approximately 3.1GHz to more than 11GHz with an insertion loss lower than −20dB through the achieved frequency band, and a correlation less than 0.002. Moreover, the proposed MIMO model exhibits a nearly omni-directional radiation pattern with almost constant gain of average value 3.28dBi.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.07.031
      Issue No: Vol. 82 (2017)
  • On the error rate of coherent binary modulation techniques in mobile
           communication systems over generalized fading channels impaired by
           generalized Gaussian noise
    • Authors: Fares S. Almehmadi; Osamah S. Badarneh
      Pages: 14 - 19
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Fares S. Almehmadi, Osamah S. Badarneh
      In the this paper, the performance of coherent binary digital modulation techniques is investigated. Specifically, we derive exact closed-form expressions for the average bit error rate (BER) of coherent binary phase shift keying (BPSK) and frequency shift keying (BFSK) in the α - μ fading channels impaired by generalized Gaussian noise. The derived expressions take into account the mobility of the wireless receiver. In this paper, we employ the random waypoint (RWP) model to study the effect of mobility on the system performance. Some representative analytical results are presented to investigate the effects of the fading parameters, noise shaping parameter, and network topology on the system performance. In addition, Monte-Carlo simulations are provided to validate the accuracy of the analytical results.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.07.021
      Issue No: Vol. 82 (2017)
  • Efficient integrated bus coding scheme for low-power I/O
    • Authors: Tareq Muhammad Supon; Iftekhar Ibne Basith; Esam Abdel-Raheem; Rashid Rashidzadeh
      Pages: 30 - 36
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Tareq Muhammad Supon, Iftekhar Ibne Basith, Esam Abdel-Raheem, Rashid Rashidzadeh
      Bus-Invert (BI) coding schemes have been used in the circuit design to save power usage by minimizing the number of transitions between successive words. With an increased number of bits for bus width, many other coding schemes like Bus-Shift (BS) and Shift-Invert (SINV) have been proposed for better power saving. In this paper, we are proposing a new Successive Shift-Invert (SSINV) coding scheme where the transmitting data will first be inverted. Then both the original and the inverted word will be shifted circularly for each bit and compared with the data just sent for least hamming distance. Thus, the combination having the least hamming distance with the last sent data will be selected and sent. The proposed method exhibits better power saving compared to other reported methods, but needs one extra control bit than BS; which add to the computation time. Simulation results show a saving margin of 5–15% in average cases in comparison with BI, BS, and SINV for higher bus width. A VerilogA implementation of SSINV using TSMC 65nm technology is also presented as a proof of concept.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.07.020
      Issue No: Vol. 82 (2017)
  • Chaos synchronization using the Fourier series expansion with application
           to secure communications
    • Authors: Saeed Khorashadizadeh; Mohammad-Hassan Majidi
      Pages: 37 - 44
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Saeed Khorashadizadeh, Mohammad-Hassan Majidi
      In this paper, a new method for secure communication based on chaos synchronization is proposed. It is consisted of a state feedback controller and a robust control term using the Fourier series expansion for compensation of uncertainties. In comparison with other uncertainty estimators such as neural networks and fuzzy systems, Fourier series are more efficient, since they have fewer tuning. Thus, their tuning process is simpler. Similar to the parameters of fuzzy systems, Fourier series coefficients are estimated online using the adaptation rule obtained from stability analysis. The case study is the Duffing–Holmes oscillator. Also, observer-based secure communication using the Fourier series expansion has been proposed. Simulation results and comparisons, reveal the superiority of the proposed approach.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.07.032
      Issue No: Vol. 82 (2017)
  • Realization of current-mode fully integrated full-wave rectifier
    • Authors: Muhammed Emin Başak; Fırat Kaçar
      Pages: 45 - 51
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Muhammed Emin Başak, Fırat Kaçar
      In this paper, a new fully integrated high frequency current-mode full-wave rectifiers are presented. The proposed circuits rectify the input signals without diode, so the output signal confronts zero-crossing distortions because of the diode characteristics have been solved with this rectifier even in high frequencies. While the current rectifier has dual output, the voltage rectifier has one output. The presented circuits have a vastly superior zero crossing performance, good linearity, minimum number of transistors, wide frequency range, and they are suitable for monolithic integrated implementation. The performances of the proposed circuits are investigated through LTSpice. Monte-Carlo and Noise analyses have also been performed to show the effectiveness of the proposed circuits.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.07.036
      Issue No: Vol. 82 (2017)
  • Low input resistance current buffer stage using a controllable positive
           feedback loop, and applications of current conveyor based filters
    • Authors: Ali Dogus Gungordu; Mustafa Altun; Ismail Cevik
      Pages: 58 - 65
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Ali Dogus Gungordu, Mustafa Altun, Ismail Cevik
      A novel current buffer stage with very low input resistance is proposed. Low input resistance is achieved using a potentially instable positive feedback loop. Stability of the circuit under different operating conditions is examined in details. A feedback control block using a bipolar 4-bit current steering DAC as a control mechanism is added to the buffer to control the input resistance and assure stability. The proposed technology-independent design methodology always ensures precision and stability for all different parasitic capacitor and resistor values of the driving signal source as well as for process, mismatch, and environmental variations. Additionally, a novel second generation current conveyor circuit based on this novel input buffer is presented to demonstrate how this buffer makes almost ideal current mode circuits possible. Filter applications using the proposed CCII are performed for further justification. The current buffer and CCII were built in AMS 0.35μm 2P4M CMOS technology. Measurement results are presented for the current buffer, the CCII circuit, and the filters.

      PubDate: 2017-08-28T00:59:50Z
      DOI: 10.1016/j.aeue.2017.07.034
      Issue No: Vol. 82 (2017)
  • Minimizing secrecy outage probability for primary users in cognitive radio
    • Authors: Qun Ding
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Qun Li, Ding Xu
      This paper considers a cognitive radio network with a set of secondary users (SUs) who share a spectrum band licensed to a primary user (PU). The PU is assumed to be eavesdropped by a set of eavesdroppers and the SUs are required to interfere with the eavesdroppers to gain their transmission opportunities. We aim to minimize the PU secrecy outage probability under the constraints that the minimum SU ergodic transmission rate and the minimum PU secrecy outage probability reduction are satisfied by optimizing SU scheduling and power allocation. Specifically, it is assumed that unscheduled SUs can send artificial noise to further interfere with the eavesdroppers. Simulation results show that the proposed algorithm outperforms the baseline round-robin scheduling scheme and the existing reference algorithm.

      PubDate: 2017-10-14T14:19:45Z
  • Design of 2.4 GHz/5 GHz planar dual-band electrically small slot
           antenna based on impedance matching circuit
    • Authors: Weina Liu; Lei Huaweia Zhan
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Weina Liu, Lei Xu, Huaweia Zhan
      A dual-band electrically small antenna based on impedance matching circuit is proposed. Which is fed by coplanar waveguide (CPW). The antenna includes two twin-spiral type slot-line short stubs and three open-circuited series-stubs with slot-line loaded at the central feed line of the CPW as impedance matching network. The total size of the antenna is 12.45 mm × 13.05 mm × 0.8 mm , with K α = 0.45 and 0.95 at 2.4 GHz and 5 GHz respectively. By the introduction of the proposed impedance matching network, the syntonic frequency of the antenna is achieved at 2.4 GHz and 5 GHz. And the measured bandwidth of S 11 < - 10 dB is about 7.5% and 12% of the two resonant frequencies. The proposed antenna has a very small ground plane ( 0.9 mm × 1.8 mm ). And it is appropriately applied to wireless communication for considerable radiation efficiency.

      PubDate: 2017-10-07T22:30:27Z
  • Orthogonal projection method for DOA estimation in low-altitude
           environment based on signal subspace
    • Authors: Hao Zhou; Guoping Junpeng Shi Ziang Feng
      Abstract: Publication date: January 2018
      Source:AEU - International Journal of Electronics and Communications, Volume 83
      Author(s): Hao Zhou, Guoping Hu, Junpeng Shi, Ziang Feng
      The rank-deficiency and subspace leakage caused by multipath effect are the main factors that lead to performance breakdown of direction of arrival (DOA) estimation in low-altitude environment. In this paper, we propose an orthogonal projection method based on signal subspace to overcome the negative effects of multipath. First, the signal covariance matrix is recovered to full-rank by forward and backward spatial smoothing (FBSS). Then, based on the least square technique, the signal subspace is used to establish the orthogonal projection matrix. Thereby the cross covariance matrices of signal and noise parts can be estimated and eliminated to modify the sample covariance matrix. Compared with the conventional methods that only dispose rank-deficiency, the proposed method has better performances in low-altitude environment. Besides, compared with the former orthogonal projection method based on steering matrix, this method reduces the computational complexity without iterative scheme. These conclusions are verified by simulations.

      PubDate: 2017-10-07T22:30:27Z
  • On-body investigation of a compact planar antenna on multilayer polymer
           composite for body-centric wireless communications
    • Authors: Abdullah Al-Sehemi; Ahmed Al-Ghamdi Nikolay Dishovsky Nikolay Atanasov Gabriela Atanasova
      Abstract: Publication date: December 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 82
      Author(s): Abdullah Al-Sehemi, Ahmed Al-Ghamdi, Nikolay Dishovsky, Nikolay Atanasov, Gabriela Atanasova
      A compact wearable flexible antenna, designed for optimal on-body performance in the 2.45GHz Industrial, Scientific and Medical (ISM) band, is proposed. Three different human body models (numerical three-layer and homogeneous tissue-equivalent model, and fabricated homogeneous tissue-equivalent phantom) are used to analyze the on-body performance of the antenna and specific absorption rate (SAR). The proposed antenna achieves more than 15.7% on-body radiation efficiency in the whole ISM frequency band and the peak 1g average SAR less than 0.18W/kg when it is placed directly over the skin of body model. The measured results are presented to demonstrate the validity of the proposed antenna. Furthermore, the proposed antenna offer advantages of being low profile, cheap and easy to fabricate. Low SAR values and high on-body antenna efficiency, making such an antenna a suited candidate for incorporation into various wearable devices for body-centric communications.

      PubDate: 2017-08-28T00:59:50Z
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