Browsing 2015/1 by Issue Date

Now showing items 1-20 of 39

  • Bandwidth Efficient Root Nyquist Pulses for Optical Intensity Channels 

    Fatima, Sabeena; Muhammad, S. Sheikh; Raza, A. D. (Společnost pro radioelektronické inženýrství, 2015-04)
    Indoor diffuse optical intensity channels are bandwidth constrained due to the multiple reflected paths between the transmitter and the receiver which cause considerable inter-symbol interference (ISI). The transmitted ...

  • A Simplified Scheme of Estimation and Cancellation of Companding Noise for Companded Multicarrier Transmission Systems 

    Peng, Siming; Yuan, Zhigang; You, Jun; Shen, Yuehong; Jian, Wei (Společnost pro radioelektronické inženýrství, 2015-04)
    Nonlinear companding transform is an efficient method to reduce the high peak-to-average power ratio (PAPR) of multicarrier transmission systems. However, the introduced companding noise greatly degrades the bit-error-rate ...

  • Optimization of Excitation in FDTD Method and Corresponding Source Modeling 

    Dimitrijevic, Bojan; Nikolic, Bojana; Aleksic, Slavoljub; Raicevic, Nebojsa (Společnost pro radioelektronické inženýrství, 2015-04)
    Source and excitation modeling in FDTD formulation has a significant impact on the method performance and the required simulation time. Since the abrupt source introduction yields intensive numerical variations in whole ...

  • An Improved Variable Structure Adaptive Filter Design and Analysis for Acoustic Echo Cancellation 

    Kar, Asutosh; Chandra, Mahesh (Společnost pro radioelektronické inženýrství, 2015-04)
    In this research an advance variable structure adaptive Multiple Sub-Filters (MSF) based algorithm for single channel Acoustic Echo Cancellation (AEC) is proposed and analyzed. This work suggests a new and improved direction ...

  • Copyright Protection of Color Imaging Using Robust-Encoded Watermarking 

    Cedillo-Hernandez, Manuel; Cedillo-Hernandez, Antonio; Garcia-Ugalde, Francisco; Nakano-Miyatake, Mariko; Perez-Meana, Hector (Společnost pro radioelektronické inženýrství, 2015-04)
    In this paper we present a robust-encoded watermarking method applied to color images for copyright protection, which presents robustness against several geometric and signal processing distortions. Trade-off between ...

  • Efficient Spectral Power Estimation on an Arbitrary Frequency Scale 

    Zaplata, Filip; Kasal, Miroslav (Společnost pro radioelektronické inženýrství, 2015-04)
    The Fast Fourier Transform is a very efficient algorithm for the Fourier spectrum estimation, but has the limitation of a linear frequency scale spectrum, which may not be suitable for every system. For example, audio and ...

  • Direction-of-Arrival Estimation Based on Sparse Recovery with Second-Order Statistics 

    Chen, Hui; Wan, Qun; Fan, Rong; Wen, Fei (Společnost pro radioelektronické inženýrství, 2015-04)
    Traditional direction-of-arrival (DOA) estimation techniques perform Nyquist-rate sampling of the received signals and as a result they require high storage. To reduce sampling ratio, we introduce level-crossing (LC) ...

  • Dielectric Properties Determination of a Stratified Medium 

    Yoiyod, Paiboon; Krairiksh, Monai (Společnost pro radioelektronické inženýrství, 2015-04)
    The method of detection of variation in dielectric properties of a material covered with another material, which requires nondestructive measurement, has numerous applications and the accurate measurement system is desirable. ...

  • A New MCMC Sampling Based Segment Model for Radar Target Recognition 

    Hadavi, Mahdi; Radmard, Mojtaba; Nayebi, Mohammad Mahdi (Společnost pro radioelektronické inženýrství, 2015-04)
    One of the main tools in radar target recognition is high resolution range profile (HRRP)‎. ‎However‎, ‎it is very sensitive to the aspect angle‎. ‎One solution to this problem is to assume the consecutive samples of HRRP ...

  • Pipelined Two-Operand Modular Adders 

    Czyzak, Maciej; Horiszny, Jacek; Smyk, Robert (Společnost pro radioelektronické inženýrství, 2015-04)
    Pipelined two-operand modular adder (TOMA) is one of basic components used in digital signal processing (DSP) systems that use the residue number system (RNS). Such modular adders are used in binary/residue and residue/binary ...

  • Design of Passive Analog Electronic Circuits Using Hybrid Modified UMDA algorithm 

    Slezak, Josef; Gotthans, Tomas (Společnost pro radioelektronické inženýrství, 2015-04)
    Hybrid evolutionary passive analog circuits synthesis method based on modified Univariate Marginal Distribution Algorithm (UMDA) and a local search algorithm is proposed in the paper. The modification of the UMDA algorithm ...

  • Design of High Performance Microstrip Dual-Band Bandpass Filter 

    Khajavi, Nafiseh; Makki, Seyed Vahab Al-Din; Majidifar, Sohrab (Společnost pro radioelektronické inženýrství, 2015-04)
    This paper presents a new design of dual-band bandpass filters using coupled stepped-impedance resonators for wireless systems. This architecture uses multiple couple stubs to tune the passband frequencies and the filter ...

  • ARQ Protocols in Cognitive Decode-and-Forward Relay Networks: Opportunities Gain 

    Zhang, Zongsheng; Wu, Qihui; Wang, Jinlong (Společnost pro radioelektronické inženýrství, 2015-04)
    In this paper, two novel automatic-repeat-request (ARQ) based protocols were proposed, which exploit coop- eration opportunity inherent in secondary retransmission to create access opportunities. If the signal was not ...

  • First-Order Statistics Prediction for a Propagation Channel of Arbitrary Non-Geostationary Satellite Orbits 

    Kvicera, Milan; Pechac, Pavel (Společnost pro radioelektronické inženýrství, 2015-04)
    A method enabling the prediction of first-order statistics of received signal level for arbitrary non-geostationary satellite orbits based on a reference dataset for a wide range of elevation angles is introduced for ...

  • Fuzzy Chance-constrained Programming Based Security Information Optimization for Low Probability of Identification Enhancement in Radar Network Systems 

    Shi, Chenguang; Wang, Fei; Zhou, Jianjiang; Chen, Jun (Společnost pro radioelektronické inženýrství, 2015-04)
    In this paper, the problem of low probability of identification (LPID) improvement for radar network systems is investigated. Firstly, the security information is derived to evaluate the LPID performance for radar network. ...

  • Objective Evaluation Criteria for Shooting Quality of Stereo Cameras over Short Distance 

    Liu, Yun; Yang, Jiachen; Chu, Rongrong (Společnost pro radioelektronické inženýrství, 2015-04)
    Stereo cameras are the basic tools used to obtain stereoscopic image pairs, which can lead to truly great image quality. However, some inappropriate shooting conditions may cause discomfort while viewing stereo images. It ...

  • A Wideband Direct Data Domain Genetic Algorithm Beamforming 

    Elkamchouchi, Hassan; Hassan, Mohamed (Společnost pro radioelektronické inženýrství, 2015-04)
    In this paper, a wideband direct data-domain genetic algorithm beamforming is presented. Received wideband signals are decomposed to a set of narrow sub-bands using fast Fourier transform. Each sub-band is transformed to ...

  • Uplink Multiuser MIMO Detection Scheme with Reduced Computational Complexity 

    Cho, Soobum; Park, Sang Kyu (Společnost pro radioelektronické inženýrství, 2015-04)
    The wireless communication systems with multiple antennas have recently received significant attention due to their higher capacity and better immunity to fading channels as compared to single antenna systems. A fast antenna ...

  • Exact Outage Performance Analysis of Multiuser Multi-relay Spectrum Sharing Cognitive Networks 

    Zhang, Tao; Yang, Weiwei; Cai, Yueming (Společnost pro radioelektronické inženýrství, 2015-04)
    In this paper, we investigate the outage performance of dual-hop multiuser multi-relay cognitive radio networks under spectrum sharing constraints. Using an efficient relay-destination selection scheme, the exact and ...

  • Design of a Wideband Inductively Coupled Loop Feed Patch Antenna for UHF RFID Tag 

    Bashri, Mohd Saiful Riza; Ibn Ibrahimy, Muhammad; Motakabber, S. M. A. (Společnost pro radioelektronické inženýrství, 2015-04)
    A planar wideband patch antenna for ultra-high frequency (UHF) radio frequency identification (RFID) tag for metallic applications is presented in this research work. Three different shape patches are inductively coupled ...