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  Subjects -> COMPUTER SCIENCE (Total: 1969 journals)
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    - COMPUTER SCIENCE (1147 journals)
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    - THEORY OF COMPUTING (8 journals)

COMPUTER SCIENCE (1147 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: 11)
Abakós     Open Access   (Followers: 3)
Academy of Information and Management Sciences Journal     Full-text available via subscription   (Followers: 67)
ACM Computing Surveys     Hybrid Journal   (Followers: 23)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 8)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 13)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 4)
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: 12)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 3)
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: 19)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 9)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 4)
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: 10)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 21)
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: 10)
Advanced Engineering Materials     Hybrid Journal   (Followers: 25)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 8)
Advances in Artificial Intelligence     Open Access   (Followers: 14)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
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: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 53)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Human-Computer Interaction     Open Access   (Followers: 19)
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: 35)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Advances in Technology Innovation     Open Access  
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 6)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Air, Soil & Water Research     Open Access   (Followers: 7)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 6)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 3)
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: 2)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 5)
Analysis in Theory and Applications     Hybrid Journal  
Animation Practice, Process & Production     Hybrid Journal   (Followers: 5)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 8)
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: 13)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Clinical Informatics     Hybrid Journal   (Followers: 1)
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: 31)
Applied Medical Informatics     Open Access   (Followers: 9)
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: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 5)
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: 8)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Basin Research     Hybrid Journal   (Followers: 3)
Behaviour & Information Technology     Hybrid Journal   (Followers: 52)
Bioinformatics     Hybrid Journal   (Followers: 231)
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: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 45)
British Journal of Educational Technology     Hybrid Journal   (Followers: 117)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 12)
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)
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: 13)
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: 18)
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: 47)
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  
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access  
Computational Ecology and Software     Open Access   (Followers: 8)
Computational Economics     Hybrid Journal   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 12)
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: 27)
Computer     Full-text available via subscription   (Followers: 78)
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: 8)
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: 13)
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: 10)
Computer Science Education     Hybrid Journal   (Followers: 12)
Computer Science Journal     Open Access   (Followers: 20)
Computer Science Master Research     Open Access   (Followers: 9)
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  [3031 journals]
  • Excitation of piezoelectric device through resonant helical coil
           antenna-like structure
    • Authors: Praveen P Nayak; Durga P Kar; Satish kumar Samal; Ayesha Mohanty; Satyanarayan Bhuyan
      Pages: 1 - 6
      Abstract: Publication date: August 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 78
      Author(s): Praveen P Nayak, Durga P Kar, Satish kumar Samal, Ayesha Mohanty, Satyanarayan Bhuyan
      A resonant helical coil antenna-like structure has been explored for wireless excitation of piezoelectric devices. The basic idea behind this wireless excitation of piezoelectric device is electromagnetic resonance along with piezoelectric resonance. The analytical studies reveal that the maximum excitation occurs in the piezoelectric device when the operating frequency of the system coincides with its mechanical resonant frequency. It has been seen that the intensity of piezoelectric stimulation depends on the frequency of operation, air gap, relative position, electric load, and the generated electric field strength by the helical coil antenna-like structure. The analytical results are verified with the measured experimental results, and are found to be in well agreement. By adopting this proposed wireless excitation system the free actuation of the piezoelectric devices can be enabled as opposed to the confined motion for various potential applications.

      PubDate: 2017-05-21T08:41:40Z
      DOI: 10.1016/j.aeue.2017.05.006
      Issue No: Vol. 78 (2017)
       
  • A systematic procedure for deriving RC networks of fractional-order
           elements emulators using MATLAB
    • Authors: Georgia Tsirimokou
      Pages: 7 - 14
      Abstract: Publication date: August 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 78
      Author(s): Georgia Tsirimokou
      The behavior of a fractional-order capacitors can be approximated using appropriately configured RC networks, which implement an integer-order impedance/admittance function. In this paper, the Foster I and II as well as the Cauer I and II structures are systematically derived using the MATLAB software. In addition, the emulation of fractional-order inductors using RC emulators of fractional-order capacitors and Generalized Impedance Converter is performed. The behavior of the derived RC networks is evaluated and compared through a design example, using the OrCAD PSpice software, in order to choose the most appropriate among them.

      PubDate: 2017-05-21T08:41:40Z
      DOI: 10.1016/j.aeue.2017.05.003
      Issue No: Vol. 78 (2017)
       
  • A quad-polarization and frequency reconfigurable square ring slot loaded
           microstrip patch antenna for WLAN applications
    • Authors: Anantha Bharathi; Merugu Lakshminarayana; P.V.D. Somasekhar Rao
      Pages: 15 - 23
      Abstract: Publication date: August 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 78
      Author(s): Anantha Bharathi, Merugu Lakshminarayana, P.V.D. Somasekhar Rao
      In this paper, a novel polarization and frequency reconfigurable microstrip patch antenna which can switch between vertical and horizontal linear polarizations, left hand and right hand circular polarizations at two WLAN frequencies is presented. The orthogonal linear polarizations are achieved by a square microstrip patch antenna fed by two ports on adjacent sides. By introducing corner truncated perturbation on opposite corners of right diagonal of a square patch, orthogonal circular polarizations are achieved. By controlling the bias voltage of two PIN diodes loaded at perturbed corners, a single structure can achieve quad polarization states. Furthermore, by superimposing a square ring slot into the corner truncated square patch and incorporating four PIN diodes into the square ring slot, quad polarization are achieved at dual frequencies. Simulated and measured results indicate that the antenna can achieve quad polarization at two WLAN bands (5.15–5.35GHz) and (5.75–5.85GHz). The proposed antenna is simple, has low profile and can be scaled easily for other frequencies.

      PubDate: 2017-05-21T08:41:40Z
      DOI: 10.1016/j.aeue.2017.05.015
      Issue No: Vol. 78 (2017)
       
  • A wideband high gain dielectric resonator antenna for RF energy harvesting
           application
    • Authors: Sachin Agrawal; Ravi Dutt Gupta; Manoj Singh Parihar; Praveen Neminath Kondekar
      Pages: 24 - 31
      Abstract: Publication date: August 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 78
      Author(s): Sachin Agrawal, Ravi Dutt Gupta, Manoj Singh Parihar, Praveen Neminath Kondekar
      A novel high gain and broadband hybrid dielectric resonator antenna (DRA) is designed and experimentally validated. To obtain the wide impedance bandwidth, the proposed antenna geometry combines the dielectric resonator antenna and an underlying slot with a narrow rectangular notch, which effectively broadens the impedance bandwidth by merging the resonances of the slot and DRA. An inverted T-shaped feed line is used to excite both antennas, simultaneously. It supports amalgamation of different resonant modes of the both, DRA and slot antenna. The measured results show that the proposed antenna offers an impedance bandwidth of 120% from 1.67 to 6.7GHz. The antenna gain is next enhanced by a reflector placed below the antenna at an optimum distance. On engineering the height and dimension of this reflector the antenna gain is improved from 2.2dBi to 8.7dBi at 1.7GHz. Finally, antenna operation is attested experimentally with a rectifier circuit in the frequency range of 1.8–3.6GHz, where various strong radio signals are freely available for RF energy harvesting. The measured maximum efficiency of the rectifier and rectenna circuit were found to be 74.4% and 61.4%, respectively.

      PubDate: 2017-05-21T08:41:40Z
      DOI: 10.1016/j.aeue.2017.05.018
      Issue No: Vol. 78 (2017)
       
  • Inductively coupled small self resonant coil (SSRC) reader antennas for HF
           RFID applications
    • Authors: Soheyl Soodmand; Tim W.C. Brown
      Pages: 32 - 40
      Abstract: Publication date: August 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 78
      Author(s): Soheyl Soodmand, Tim W.C. Brown
      A new model of inductively coupled high frequency radio frequency identification (HF RFID) reader antennas is presented in this paper based on the idea of using the self resonance frequency (SRF) of a small multi turn coil. The introduced multi turn small self resonant coil (MT SSRC) antenna is mathematically analyzed in terms of SRF, number of turns, dimensions and dielectric characteristics of the insulation, where present. Based on the analysis, a compact planar version of MT SSRC antennas having two turns, the two turn planar SSRC (TTP SSRC), is investigated and the dependency of the SRF to the antenna dimension is observed. A TTP SSRC antenna operating at 13.56MHz is fabricated and is compared with an old model of HF RFID antennas; an optimized Q factor and a more uniform near field pattern is obtained for the new antenna. The benefits of the obtained optimized Q factor and uniform near pattern is explained for smart shelf application. Also, a number of TTP SSRC antennas operating at a distinct frequency, 13.56MHz here, are fabricated on different substrates and it is shown that the Q factor and dimension of the TTP SSRC antenna could be controlled and adjusted based on the dielectric characteristics of the substrate. The new antenna prototype has a beneficial application to smart shelf applications in HF RFID.

      PubDate: 2017-05-21T08:41:40Z
      DOI: 10.1016/j.aeue.2017.05.019
      Issue No: Vol. 78 (2017)
       
  • DOA estimation of LFM signals based on STFT and multiple invariance ESPRIT
    • Authors: Kaibo Cui; Weiwei Wu; Jingjian Huang; Xi Chen; Naichang Yuan
      Pages: 10 - 17
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Kaibo Cui, Weiwei Wu, Jingjian Huang, Xi Chen, Naichang Yuan
      In order to improve the angle measurement precision of LFM signals with a low computational complexity, a direction of arrival (DOA) estimation algorithm STFT-MI-ESPRIT is proposed in this paper. The algorithm is based on short time Fourier transform (STFT) and multiple invariance estimation of signal parameters via rotational invariance techniques (MI-ESPRIT). Firstly, the STFT of the array element’s output is calculated and the signals are transformed to the time-frequency domain. Then the spatial time-frequency distribution matrix can be obtained through selecting multiple single-source time-frequency points in the time-frequency plane and the signal subspace can also be obtained using Eigen decomposition. Finally, the multiple rotational invariant equation of the array based on STFT is obtained and the closed-form solution is obtained using the multi-least-squares (MLS) criterion. The simulation results show that the proposed algorithm can improve the estimation precision greatly compared with the traditional ESPRIT-like algorithms and its computational complexity remains the same in general. This paper also proposes that the STFT-MI-ESPRIT algorithm can use partial rotational invariances of the array instead of all the rotational invariances, which can reduce the computational complexity on the basis of ensuring the estimation precision basically. The simulation results verify the effectiveness of the conclusion.

      PubDate: 2017-04-30T01:59:16Z
      DOI: 10.1016/j.aeue.2017.04.021
      Issue No: Vol. 77 (2017)
       
  • Accurate remote vital sign monitoring with 10GHz ultra-wide patch antenna
           array
    • Authors: Muhammad Saqib Rabbani; Hooshang Ghafouri-Shiraz
      Pages: 36 - 42
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Muhammad Saqib Rabbani, Hooshang Ghafouri-Shiraz
      A patch antenna array has been presented at 10GHz frequency with improved gain (14dBi) and far-field radiation capabilities for accurate detection of human respiration and heart beat rate with Doppler radar technique. The measured and simulation antennas’ results showed good agreement. Feasibility of 10GHz channel has been studied for remote vital sign monitoring (RVSM) under Doppler radar theory. Both the breathing rate (BR) and heart rate (HR) of a man have been accurately detected from various distances ranging from 5cm to 4m with as small transmitted power as −10dBM.

      PubDate: 2017-04-30T01:59:16Z
      DOI: 10.1016/j.aeue.2017.04.024
      Issue No: Vol. 77 (2017)
       
  • Underdetermined blind source separation by a novel time–frequency
           method
    • Authors: Qiao Su; Yuehong Shen; Yimin Wei; Changliang Deng
      Pages: 43 - 49
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Qiao Su, Yuehong Shen, Yimin Wei, Changliang Deng
      This paper proposes a novel underdetermined blind source separation (UBSS) method based on short-time Fourier transform (STFT) to separate non-stationary sources. This method relaxes the premise in the subspace algorithm presented by Aissa-El-Bey et al. and allows that the number of active sources is no more than that of sensors by exploiting the statistic characteristic of sources and sparsity of non-stationary signals in time–frequency (TF) domain simultaneously. It first estimates the indexes of active sources in TF domain accurately by calculating the average power of sources at every TF point (except the point with the trivial energy contribution) and then obtains the estimation of source STFT by pseudo-inversion operator, which can avoid calculating the eigenvalue of covariance matrix of the mixtures and seeking the minimum of the object function based on subspace projection. Thus, the proposed algorithm has low computational cost and high separation quality. Simulation results validate the superiority of the proposed algorithm in comparison with the existing subspace-based algorithms.

      PubDate: 2017-04-30T01:59:16Z
      DOI: 10.1016/j.aeue.2017.04.025
      Issue No: Vol. 77 (2017)
       
  • Segmenting object with ambiguous boundary using information theoretic
           rough sets
    • Authors: Khai-Yin Lim; Rajeswari Mandava
      Pages: 50 - 56
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Khai-Yin Lim, Rajeswari Mandava
      In image segmentation, image is divided into regions of similar pixels that satisfy a defined notion of similarity. The complexity of image segmentation is further increased when the separation between neighboring regions is ambiguous. In this paper, we propose an approach that uses the information theoretic rough sets concept (ITRS) to model the ambiguous boundary of the object for further segmentation. The advantage of this approach is incorporating the prior knowledge of the object for effective extraction despite its ambiguous boundary. This approach starts with an assumption that seed points of the regions are available. It then computes the probability of association of the pixels with the seed points. Rough sets theory is invoked on this probability or likelihood map to identify positive, negative, and boundary states of the object. Optimal threshold for the boundary region is determined using histogram based segmentation algorithm for final object extraction. The main contribution relies on the application of ITRS in categorizing the object by combining both the prior and image information. The proposed approach, ITRS segmentation, is compared with different image segmentation methods on simulated brain images, and the result is encouraging with its state-of-the-art performance.

      PubDate: 2017-04-30T01:59:16Z
      DOI: 10.1016/j.aeue.2017.04.027
      Issue No: Vol. 77 (2017)
       
  • Design of the compact UHF RFID meander-line antenna loaded with CPW
           elements
    • Authors: Diogo B. Oliveira; Elson J. Silva
      Pages: 57 - 60
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Diogo B. Oliveira, Elson J. Silva
      In this paper, Coplanar Waveguide (CPW) elements are used to load UHF RFID meander-line antennas. Although, the insertion of these elements allow to design small antennas their gain decrease depending on the CPW structures are connected. In this sense, a new location to print CPW elements in the meander-line antenna is proposed aiming not to deteriorate the gain. A multi-objective optimization algorithm is applied in the meander-line antennas loaded with CPW elements in different positions and a comparison between their performances is done. To validate the computational model of the proposed antenna its input impedance is measured.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.04.022
      Issue No: Vol. 77 (2017)
       
  • Image quality assessment for contrast enhancement evaluation
    • Authors: Ayub Shokrollahi; Ahmad Mahmoudi-Aznaveh; Babak Mazloom-Nezhad Maybodi
      Pages: 61 - 66
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Ayub Shokrollahi, Ahmad Mahmoudi-Aznaveh, Babak Mazloom-Nezhad Maybodi
      Although the contrast enhancement (CE) is a great challenge, few efforts have been conducted on evaluation of the contrast changes. In this paper, we propose a contrast-changed image quality (CCIQ) metric including a local index, named edge-based contrast criterion (ECC), and three global measures. In the global measures, entropy, correlation coefficient and mean intensity are exploited. Particle swarm optimization (PSO) algorithm is utilized for obtaining an optimal combination of these quantities. Although the presented method utilizes the original image, it cannot be considered as a full-reference metric, since the original image is not regarded to have the ideal quality. Hence, it can be concluded that it follows a new paradigm in image quality assessment. Experimental results on the three benchmark databases, CID2013, TID2013 and TID2008 demonstrate that the proposed metric outperforms the-state-of-the-art methods.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.04.026
      Issue No: Vol. 77 (2017)
       
  • Sub 0.5-V bulk-driven LTA in 0.18μm CMOS
    • Authors: Tomasz Kulej; Fabian Khateb
      Pages: 67 - 75
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Tomasz Kulej, Fabian Khateb
      The paper deals with a new solution for an ultra-low-voltage loser take all (LTA) circuit, capable to operate from supply voltages ranging from 0.3 to 0.5V. The proposed circuit exploit the idea of multiple voltage buffers with a common output. In order to obtain a compact and precise LTA, a new kind of an ultra-low-voltage buffer has been developed. Owing to the fact that for such a low supply voltage the available voltage swing is highly reduced, the impact of transistor mismatches and speed-accuracy-power tradeoffs have extensively been discussed in the paper. While implemented in a standard 0.18μm CMOS process, the proposed LTA circuit in a two-input version consumes 3.0μW from a 0.5V supply and provides 10μs crossover recovery time for a 1pF load capacitance.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.04.032
      Issue No: Vol. 77 (2017)
       
  • Wideband high gain circularly polarized UHF RFID reader microstrip antenna
           and array
    • Authors: Xuefeng Zhao; Yongjun Huang; Jian Li; Qing Zhang; Guangjun Wen
      Pages: 76 - 81
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Xuefeng Zhao, Yongjun Huang, Jian Li, Qing Zhang, Guangjun Wen
      This paper presents a wideband and high gain circularly polarized ultra-high- frequency (UHF) radio frequency identification (RFID) reader microstrip antenna and array. Such antenna unit is composed of one main radiation patch and one parasitic radiation patch with air as the dielectric spacer. Two feeding lines connect to the main radiation patch with 90deg phase difference. Numerical optimizations and experimental demonstrations are performed to investigate the performances of the proposed antenna unit and good agreements are obtained. This antenna unit can cover the whole UHF band (860–960MHz) with gain of 9.7dBi. Then two antenna arrays of 1 × 4 and 2 × 2 based on previously demonstrated antenna unit are numerically investigated. The array performances, including the gain, beam scanning and low side-lobe are discussed. The obtained results in this paper indicate that the proposed antenna and array are suitable for the universal UHF RFID applications.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.04.034
      Issue No: Vol. 77 (2017)
       
  • Outage analysis of TAS/MRC in dual hop full-duplex MIMO relay networks
           with co-channel interferences
    • Authors: Mesut Toka; Oğuz Kucur
      Pages: 82 - 90
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Mesut Toka, Oğuz Kucur
      In this paper, we investigate the outage performance of transmit antenna selection (TAS) and maximal-ratio combining (MRC) in dual hop full-duplex (FD) amplify-and-forward (AF) relay network over Rayleigh fading channels. In the analysis, Rayleigh faded multiple co-channel interferers (CCIs) are also taken into account at the relay. In the network, source and destination are equipped with multiple antennas, and relay is equipped with one receive and one transmit antennas, respectively and source-destination link is not available. While the TAS is applied at the source without considering residual self-interference (RSI) effect, received signals at the destination are combined based on the MRC technique. For the analysis, we consider three approaches at the relay. In the first, we consider the received signal at the relay is corrupted by faded RSI and noise, in the second one, the RSI is considered as non-fading. In the last one, the noise is neglected. In all cases, the relay suffers from multiple Rayleigh faded CCIs. Outage probability (OP) expression related to all the cases is derived and obtained in single integral forms in case of the faded/non-fading RSI and in closed form in case of the noise neglected approach. Moreover, we also find asymptotic OPs and conduct effective diversity order analysis. The analytical results are verified by the Monte Carlo simulations. Results show that TAS decreases error floor at high signal-to-noise ratio (SNR) region and MRC provides diversity gain at low SNR region. In addition, approaches II and III are good approximations to approach I at low and high SNR regions, respectively.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.04.010
      Issue No: Vol. 77 (2017)
       
  • Performance analysis of adaptive DFE using set-membership binormalized
           data-reusing LMS algorithm for frequency selective MIMO channels
    • Authors: Ramesh Chandra Mishra; Ratnajit Bhattacharjee
      Pages: 91 - 99
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Ramesh Chandra Mishra, Ratnajit Bhattacharjee
      This paper addresses the concern of complexity involved with adaptive equalization in wireless systems operating over time-varying and frequency selective multiple-input multiple-output (MIMO) channels. Here, we propose a decision feedback equalizer using binormalized data-reusing least mean square (BNLMS) algorithm with set-membership filtering for MIMO channels. The performance of the equalizer is investigated for a MIMO receiver in a multi-path fading environment as experienced in the indoor and pedestrian environment. The equalizer performance is also studied for channels having higher delay and Doppler spread. The convergence issues, BER performance and tracking capabilities are examined through computer simulations. Moreover, the computational complexity issue for this MIMO equalizer is compared with other existing data-selective algorithm based techniques.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.04.018
      Issue No: Vol. 77 (2017)
       
  • A 2D adaptive beamforming method in sparse array
    • Authors: Wenhao Zeng; Hongtao Li; Xiaohua Zhu; Cheng Chen
      Pages: 100 - 104
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Wenhao Zeng, Hongtao Li, Xiaohua Zhu, Cheng Chen
      This study presents an Accelerated Proximal Gradient singular value thresholding based Linearly Constrained Singular Canceler (APG-LCSC) algorithm to improve the performance of two-dimensional (2D) adaptive beamforming in sparse array. Firstly, a signal model is established based on Matrix Completion (MC), which can be proved to meet Null Space Property (NSP). Subsequently, left and right singular value vector of the received signal matrix is achieved via MC, and then a linearly constrained singular canceler is obtained by employing the singular value vector. The proposed algorithm decreases the required number of antennas, lowers the computational complexity and has a robust performance. Computer simulations demonstrate that the proposed APG-LCSC algorithm can acquire high accuracy of 2D beamforming in sparse array.

      PubDate: 2017-05-11T11:53:26Z
      DOI: 10.1016/j.aeue.2017.04.015
      Issue No: Vol. 77 (2017)
       
  • Emitter-coupled pair chaotic generator circuit
    • Authors: João V.C. Evangelista; José A.P. Artiles; Daniel P.B. Chaves; Cecilio Pimentel
      Pages: 112 - 117
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): João V.C. Evangelista, José A.P. Artiles, Daniel P.B. Chaves, Cecilio Pimentel
      An emitter-coupled pair chaotic generator is proposed with a control parameter that can be tuned for distinct chaotic behaviors. The proposed circuit is a compact, high-speed implementation of the chaotic map based on the hyperbolic tangent function. It is demonstrated that the circuit and map parameters are analytically related. As an application, we design a random number generator that passes all NIST statistical tests by applying a post-processing to the balanced bit sequence generated by a quantization of the circuit output.

      PubDate: 2017-05-11T11:53:26Z
      DOI: 10.1016/j.aeue.2017.04.029
      Issue No: Vol. 77 (2017)
       
  • On k-channel connectivity in cognitive radio networks through channel
           assignment
    • Authors: Ram Narayan Yadav; Rajiv Misra
      Pages: 118 - 129
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Ram Narayan Yadav, Rajiv Misra
      Cognitive radio network (CRN), forces the secondary users (SUs) to vacate the channel and switch to other unused channel when a primary user (PU) starts using its channel. Thus, the channels available for an SU vary over time depending on PU’s activities. This temporal variation in channel availability can cause network partitioning, if there is no other available channel is present in the network which poses challenge among researchers “how to ensure robust connectivity in CRN?” A topology generated by a channel assignment is called k-channel connected if the nodes in the remaining topology can be connected when any set of ( k - 1 ) channels from channel set have been reclaimed by PUs and become unavailable to SUs. To the best of our knowledge, this is the first work on k-channel connectivity in CRN. We proved that this problem is NP-hard using c-colorability problem. To address this problem, we first present a polynomial time centralized algorithm, called Centralized k-channel Connected Spanning Subgraph ( CCSS k ) , which use O ( k 2 log n ) approximation algorithm to find minimum cost subset k-connected subgraph problem as a subroutine. Based on CCSS k , we propose a distributed algorithm, called Distributed k-channel Connected Spanning Subgraph ( DCSS k ) with message complexity O ( 2 n + n ( 1 + Δ ) + n log 2 n ) , where n denotes the number of nodes and Δ is the maximum node degree in topology under maximum transmission power. Through simulations it has be observed that the proposed algorithms are able to preserve minimum energy paths and reduce the number of required channels efficiently to address the k-channel connected topology control problem. Simulation results also show that the CCSS k and DCSS k reduce the number of links by 55 % and 45 % respectively.

      PubDate: 2017-05-11T11:53:26Z
      DOI: 10.1016/j.aeue.2017.04.023
      Issue No: Vol. 77 (2017)
       
  • A wireless multi-channel implantable neural recording microsystem based on
           optimized analog TDM-FDM combination
    • Authors: Khosro Rajabpour-Moghaddam; Abdolreza Mohammadi
      Pages: 130 - 138
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Khosro Rajabpour-Moghaddam, Abdolreza Mohammadi
      Crosstalk noise (CT) is a limiting factor to increase the number of channels in analog Time-Division-Multiplexing (TDM)-based Wireless Neural Recording microsystems (WNRs). This paper proposes a novel approach to mitigate and decrease the effect of the CT by combining TDM with Frequency-Division-Multiplexing (FDM). In particular, we evaluate some possible configurations of the TDM-FDM combination and present a system that has less CT than other configurations. A 12-channel WNR based on the proposed system is designed in both system and circuit-level. In this system, channels are first divided into three 4-channel groups and after multiplexing in time domain, they are combined together with FDM method. While the group containing the marker pulse is located in the base-band, the second and third group are shifted to the frequency domain by employing quadrature modulation. The circuit-level of the system is designed and simulated by using 0.18μm CMOS technology. The designed circuit consumes a power of 1.4mW at a supply voltage of 1.8V. The performance of the proposed system is also compared with simple TDM-based WNR. Simulations shows that in the proposed system the CT is considerably decreased.

      PubDate: 2017-05-11T11:53:26Z
      DOI: 10.1016/j.aeue.2017.04.011
      Issue No: Vol. 77 (2017)
       
  • Novel distributed algorithm for coalition formation for enhanced spectrum
           sensing in cognitive radio networks
    • Authors: Mohammad Tahir; Mohamed Hadi Habaebi; Md. Rafiqul Islam
      Pages: 139 - 148
      Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77
      Author(s): Mohammad Tahir, Mohamed Hadi Habaebi, Md. Rafiqul Islam
      In this paper, we propose a novel algorithm for improving spectrum sensing in cognitive radio networks by forming coalitions among cognitive radio users in a fading channel environment. We use concepts from matching theory, specifically the stable marriage problem, to formulate the interactions among the cognitive radio users as a matching game for collaborative distributed spectrum sensing under target detection probability constraint. The utility function is defined as the average probability of false alarm per cognitive radio user. The advantage of stable marriage is that it always converges to a stable matching and is Pareto optimal when the preferences of cognitive radios are strict. In the proposed model, we extend the stable matching problem to propose a novel algorithm to form coalitions of varying sizes for improving the utility of cognitive radios (false alarm and throughput). The coalitions formed using the algorithm are stable and do not deviate from the final matching. We show using simulations that the proposed algorithm leads to stable coalitions and returns significant improvement in term of reduced probability of false alarm and improved throughput per cognitive radio user as compared to the non-cooperative scenario.

      PubDate: 2017-05-11T11:53:26Z
      DOI: 10.1016/j.aeue.2017.04.033
      Issue No: Vol. 77 (2017)
       
  • Jamming Mitigation using an Improved Fuzzy Weighted Least Square Method in
           Combined GPS and GLONASS Receiver
    • Authors: Mohammad-Reza Mosavi; Atieh Khavari; Amir Tabatabaei; Mohammad-Javad Rezaei
      Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76
      Author(s): Mohammad-Reza Mosavi, Atieh Khavari, Amir Tabatabaei, Mohammad-Javad Rezaei
      One of the important concerns in Global Positioning System (GPS) is interference and jamming attack. Different methods have been proposed to mitigate GPS jamming such as antenna array and digital signal filtering. In this paper, the integration of GPS with Russian Global Navigation Satellite System (GLONASS) is utilized to overcome this issue. Increasing the number of visible satellites is a significant benefit of this combined system. We also introduce an improved Fuzzy-Weighted Least-Square (FWLS) method to weight the information according to its transmitter system reliability and satellite properties. The experimental comparison between the proposed method and an improved Wavelet-Packet-Transform (WPT)-based anti-jammer shows that though the accuracy of WPT-based method is more than FWLS method, the FWLS has significantly less computation complexity and more reliability.

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

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

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

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

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

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

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

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

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

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

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.023
      Issue No: Vol. 76 (2017)
       
  • Editorial board members
    • Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77


      PubDate: 2017-05-21T08:41:40Z
       
  • Editorial board members
    • Abstract: Publication date: July 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 77


      PubDate: 2017-05-21T08:41:40Z
       
  • DC and Microwave Characteristics of Lg 50nm T-Gate InAlN/AlN/GaN HEMT for
           Future High Power RF Applications
    • Authors: P. Murugapandiyan; S. Ravimaran; J. William
      Abstract: Publication date: Available online 6 May 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): P. Murugapandiyan, S. Ravimaran, J. William
      The DC and microwave characteristics of Lg=50 nm T-gate InAlN/AlN/GaN High Electron Mobility Transistor (HEMT) on SiC substrate with heavily doped n+ GaN source and drain regions have demonstrated using Synopsys TCAD tool. The proposed device features an AlN spacer layer, AlGaN back-barrier and SiN surface passivation. The proposed HEMT exhibits a maximum drain current density of 1.8 A/mm, peak transconductance (gm) of 650 mS/mm and ft/fmax of 118/210 GHz. At room temperature, the measured carrier mobility, sheet charge carrier density (ns) and breakdown voltage are 1195 cm2/Vs, 1.6 x 1013 cm-2 and 18 V respectively. The superlatives of the proposed HEMTs are bewitching competitor for future monolithic microwave integrated circuits (MMIC) applications particularly in W-band (75-110 GHz) high power RF applications.

      PubDate: 2017-05-11T11:53:26Z
      DOI: 10.1016/j.aeue.2017.05.004
       
  • A Low Cost Electrically Tunable Bandpass Filter with Constant Absolute
           Bandwidth
    • Authors: Dwipjoy Sarkar; Tamasi Moyra
      Abstract: Publication date: Available online 6 May 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Dwipjoy Sarkar, Tamasi Moyra
      This paper presents an electrically tunable bandpass filter which provides nearly constant absolute bandwidth (CABW) within the center frequency tuning range. The proposed tunable band pass filter (BPF) is designed on a low cost FR4 substrate with mixed coupled 3rd order open loop ring resonators, high frequency varactor diodes, chip capacitors and some RF chokes. The center frequency of the BPF is tunable from 1.9 GHz to 2.52 GHz with 3 dB absolute bandwidth of 201.5±1.5 MHz. The measured insertion loss of the proposed BPF is found less than 3 dB within the tuning range. There is a good agreement found between the simulated and measured results of the proposed BPF.

      PubDate: 2017-05-11T11:53:26Z
      DOI: 10.1016/j.aeue.2017.05.007
       
  • Editorial board members
    • Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76


      PubDate: 2017-05-06T05:59:23Z
       
  • Editorial board members
    • Abstract: Publication date: June 2017
      Source:AEU - International Journal of Electronics and Communications, Volume 76


      PubDate: 2017-05-06T05:59:23Z
       
  • A Novel Threshold based Compressed Channel Sensing in OFDM System
    • Authors: Hui Xie; Guillaume Andrieux; Yide Wang; Suili Feng; Zhiwen Yu
      Abstract: Publication date: Available online 5 May 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Hui Xie, Guillaume Andrieux, Yide Wang, Suili Feng, Zhiwen Yu
      High speed data transmission for wireless communication in orthogonal frequency division multiplexing (OFDM) system requires effective channel state information (CSI). CSI should be precisely estimated with low consumption of spectral resources and acceptable computational cost. To realize this goal, an effective compressed sensing (CS) based channel estimation scheme is proposed for sparse channels with large delay spreads, without prior knowledge of channel statistics and noise standard deviation. By fully considering the rank of the measurement matrix, a novel algorithm based on orthogonal matching pursuit (OMP) and least squares (LS) methods with a new threshold is proposed for effective channel estimation. Simulation results show that with fewer number of pilots, the proposed method outperforms the compared existing channel estimation methods in a comprehensive way and approaches the optimal channel estimation performance.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.05.002
       
  • Compact Triple-Band Bandstop Filter Using Folded, Symmetric
           Stepped-Impedance Resonators
    • Authors: Xueliang Min; Hou Zhang
      Abstract: Publication date: Available online 3 May 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Xueliang Min, Hou Zhang
      A compact bandstop filter composed of eight folded stepped-impedance resonator cells for triple-band stopband is presented. Based on the analysis of unit structure's characteristic and parametric analysis, it is found that the result of input output connecting lines with proposed stepped-impedance resonator cells exhibits three transmission zeros. Through tuning the geometry parameters in a small range, the design flexibility of transmission zeros is depicted. Then, the influence of different amounts of folded, symmetric resonator cells is researched for the sake of getting the characteristic of triple-band rejection. Via optimization, a compact triple-band bandstop filter adopting eight stepped-impedance resonator cells has been fabricated and measured. Three center frequencies at 3.8, 6.7 and 9.5GHz are reported corresponding to the attenuation level of 54.3, 37.4 and 27.5dB with return losses of 0.11, 0.25 and 0.71dB. Additionally, there are two transmission poles on the right and left sides of each stopbands for better selectivity. Owing to the folded shape, the totally size of the proposed structure gets reduced.

      PubDate: 2017-05-06T05:59:23Z
      DOI: 10.1016/j.aeue.2017.05.001
       
  • Network Failure Detection Based on Correlation Data Analysis
    • Authors: Piotr Zych
      Abstract: Publication date: Available online 22 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Piotr Zych
      For a telecommunication operator, the effective detection of access and aggregation network failures is the key to providing continuous service. Although there are many monitoring systems on the market, analysis has shown that there is no possibility of automatically detecting all failures using standard monitoring systems. In this article, an innovative option for failure detection is proposed, based on correlation analysis of data retrieved in real time from the network. A key source of data is the Remote Authentication Dial-in User Service (RADIUS) which records events giving information about auser’s Point-to-Point Protocol (PPP) session state sent to the monitoring system. It is shown here that the proposed solution enables an operator to detect all network events affecting customers. The detection of a greater number of events enables the operator to react quickly to them and to restore services to users as soon as possible, which ultimately improves the quality and continuity of provided services.

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

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

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

      PubDate: 2017-04-23T01:55:05Z
      DOI: 10.1016/j.aeue.2017.04.019
       
  • PAPR Analysis of Wavelet Based Multitaper GFDM System
    • Authors: Shravan Kumar; Bandari Venkata Mani Vakamulla Anastasios Drosopoulos
      Abstract: Publication date: Available online 14 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Shravan Kumar Bandari, Venkata Mani Vakamulla, Anastasios Drosopoulos
      To guarantee a reliable, accurate communication with reduced latency and increased throughput, one of the 5G candidates Generalized Frequency Division Multiplexing (GFDM) has emerged out. Due to the non-orthogonal nature of GFDM inherent Inter Symbol Interference (ISI), Inter Carrier Interference (ICI) and high Peak to Average Power Ratio (PAPR) may occur. In order to combat such effects prolate windows are incorporated as a prototype filter to design an improved orthogonal system which provides a robust multitaper GFDM (MGFDM) carrier technique for next generation wireless networks, which outperforms conventional GFDM in terms of PAPR. In this paper, we propose a novel wavelet based MGFDM (WM-GFDM) to further reduce the PAPR by considering various wavelet transforms such as Haar, Daubechies, symlets, coiflets, Biorthogonal, Reverse Biorthogonal and Discrete Meyer Wavelets. Here, the conventional Fourier Transforms as used in traditional systems was replaced with Wavelet Transforms. The results show that PAPR performance with wavelet implementation outperformed both conventional GFDM and MGFDM by several dB. In addition, symbol error rate (SER) of WM-GFDM in comparison with conventional GFDM, MGFDM and Orthogonal FDM (OFDM) is analyzed along with spectral comparison where the results suggest that WM-GFDM follows the steps of GFDM and MGFDM.

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

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

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.004
       
  • Noise-Robust Scream Detection using Band-limited Spectral Entropy
    • Authors: Noboru Hayasaka; Arata Kawamura; Naoto Sasaoka
      Abstract: Publication date: Available online 11 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): Noboru Hayasaka, Arata Kawamura, Naoto Sasaoka
      This report describes scream detection systems that can detect screams under noisy conditions and describes techniques for increasing their noise-robustness. More specifically, spectral entropy, which expresses the difference in frequency distribution between a scream and noise, is used as a detection feature. Furthermore, a method is presented that improves scream detection accuracy in noisy environments by limiting the frequency band of the spectral entropy used as the detection feature. Evaluation experiments in noisy environments demonstrated that the proposed method has better scream detection capability than a conventional method. The proposed method can detect screams with equal error rates of 0.3 % and 0.8 % under 0 and - 5 dB conditions, respectively. Furthermore, the cost of likelihood calculation is about 1 / 12 th that of the conventional method. The proposed method can thus be used to develop a scream detection system that is sufficiently accurate in an actual environment.

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

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

      PubDate: 2017-04-15T19:35:27Z
      DOI: 10.1016/j.aeue.2017.04.006
       
  • A Simple Transmit Diversity System for Fading Channels Using Shaped
           Sinusoidal functions
    • Authors: A.Y. Hassan
      Abstract: Publication date: Available online 6 April 2017
      Source:AEU - International Journal of Electronics and Communications
      Author(s): A.Y. Hassan
      This paper proposes a transmit-diversity system using a pair of orthogonal pulses. The system uses a set of orthonormal-basic functions, which contains four shaped-sinusoidal pulses with the same frequency. The first two elements in the set are shaped sine and cosine pulses. The second two elements are the same sine and cosine pulses but they are shaped with the Hilbert transform of the shaping pulse of the first two elements. The modulator in the proposed system produces two modulated symbols for each data symbol. It uses the first two elements in the proposed set in modulating the first modulated symbol and the second two elements in modulating the second modulated symbol. The modulated symbols are transmitted though two antennas. The diversity order of the proposed system is twice the number of antennas in the receiver. In the proposed system, no space-time coding is used and the channel gains change every symbol period. This is different from the Multiple-Input-Multiple-Output (MIMO) system. The receiver of the proposed system consists of two matched filters for each receiving antenna. No special detectors or interference cancelation techniques are used because there is no interference between the outputs of the matched filters.

      PubDate: 2017-04-08T19:12:20Z
      DOI: 10.1016/j.aeue.2017.03.024
       
 
 
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