Procházení 2015/1 dle data publikování
Zobrazují se záznamy 1-20 z 39
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An Electronically Reconfigurable Patch Antenna Design for Polarization Diversity with Fixed Resonant Frequency
(Společnost pro radioelektronické inženýrství, 2015-04)In this paper, an electronically polarization reconfigurable circular patch antenna with fixed resonant frequency operating at Wireless Local Area Network (WLAN) frequency band (2.4-2.48 GHz) is presented. The structure ... -
Optimal Power Allocation for Channel Estimation in MIMO-OFDM System with Per-Subcarrier Transmit Antenna Selection
(Společnost pro radioelektronické inženýrství, 2015-04)A novel hybrid channel estimator is proposed for multiple-input multiple-output orthogonal frequency- division multiplexing (MIMO-OFDM) system with per-subcarrier transmit antenna selection having optimal power allocation ... -
Design of a Wideband Inductively Coupled Loop Feed Patch Antenna for UHF RFID Tag
(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 ... -
A Simplified Scheme of Estimation and Cancellation of Companding Noise for Companded Multicarrier Transmission Systems
(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 ... -
Low-Profile Fully-Printed Multifrequency Monopoles Loaded with Complementary Metamaterial Transmission Line
(Společnost pro radioelektronické inženýrství, 2015-04)The design of a new class of multifrequency monopoles by loading a set of resonant-type complementary metamaterial transmission lines (CMTL) is firstly presented. Two types of CMTL elements are comprehensively explored: ... -
Uplink Multiuser MIMO Detection Scheme with Reduced Computational Complexity
(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
(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 ... -
Electromagnetic Scattering and Statistic Analysis of Clutter from Oil Contaminated Sea Surface
(Společnost pro radioelektronické inženýrství, 2015-04)In order to investigate the electromagnetic (EM) scattering characteristics of the three dimensional sea surface contaminated by oil, a rigorous numerical method multilevel fast multipole algorithm (MLFMA) is developed to ... -
A Wideband Direct Data Domain Genetic Algorithm Beamforming
(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 ... -
Copyright Protection of Color Imaging Using Robust-Encoded Watermarking
(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 ... -
Objective Evaluation Criteria for Shooting Quality of Stereo Cameras over Short Distance
(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 ... -
Joint Dynamic Radio Resource Allocation and Mobility Load Balancing in 3GPP LTE Multi-Cell Network
(Společnost pro radioelektronické inženýrství, 2015-04)Load imbalance, together with inefficient utilization of system resource, constitute major factors responsible for poor overall performance in Long Term Evolution (LTE) network. In this paper, a novel scheme of joint dynamic ... -
ARQ Protocols in Cognitive Decode-and-Forward Relay Networks: Opportunities Gain
(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 ... -
A New MCMC Sampling Based Segment Model for Radar Target Recognition
(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 ... -
New Negentropy Optimization Schemes for Blind Signal Extraction of Complex Valued Sources
(Společnost pro radioelektronické inženýrství, 2015-04)Blind signal extraction, a hot issue in the field of communication signal processing, aims to retrieve the sources through the optimization of contrast functions. Many contrasts based on higher-order statistics such as ... -
A Fast DOA Estimation Algorithm Based on Polarization MUSIC
(Společnost pro radioelektronické inženýrství, 2015-04)A fast DOA estimation algorithm developed from MUSIC, which also benefits from the processing of the signals' polarization information, is presented. Besides performance enhancement in precision and resolution, the proposed ... -
Pipelined Two-Operand Modular Adders
(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 ... -
Fuzzy Chance-constrained Programming Based Security Information Optimization for Low Probability of Identification Enhancement in Radar Network Systems
(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. ... -
Dielectric Properties Determination of a Stratified Medium
(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. ... -
Direction-of-Arrival Estimation Based on Sparse Recovery with Second-Order Statistics
(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) ...