Browsing 2017/4 by Title
Now showing items 1-20 of 36
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The Analysis of Closed-form Solution for Energy Detector Dynamic Threshold Adaptation in Cognitive Radio
(Společnost pro radioelektronické inženýrství, 2017-12)Spectrum sensing is the most important process in cognitive radio in order to ensure interference avoidance to primary users. For optimal performance of cognitive radio, it is substantial to monitor and promptly react to ... -
Approach of the T-CONT Allocation to Increase the Bandwidth in Passive Optical Networks
(Společnost pro radioelektronické inženýrství, 2017-12)This paper works with the simulation of T-CONT allocation and delay analysis in passive optical networks PON. Building our networks with the PON technology we can achieve increased data rates, however we need to ensure ... -
Automatic Detection of Aerial Vehicle in Cloudy Environment by Using Wavelet Enhancement Technique
(Společnost pro radioelektronické inženýrství, 2017-12)Automatic target detection of surface to air surveillance and tracking systems in video applications is an important issue, because it is the first step for track initiation and continuity. Target detection can be readily ... -
Automatic Modulation Classification of LFM and Polyphase-coded Radar Signals
(Společnost pro radioelektronické inženýrství, 2017-12)There are several techniques for detecting and classifying low probability of intercept radar signals such as Wigner distribution, Choi-Williams distribution and time-frequency rate distribution, but these distributions ... -
Automatic Text-Independent Artifact Detection, Localization, and Classification in the Synthetic Speech
(Společnost pro radioelektronické inženýrství, 2017-12)The paper describes experiments with statistical approaches to automatic detection, localization, and classification of the basic types of artifacts in the synthetic speech produced by the Czech text-to-speech system using ... -
A Broadband Transmission Metasurface with Polarization-Transforming Functionality
(Společnost pro radioelektronické inženýrství, 2017-12)A transmission metasurface with polarization-transforming functionalities is presented. The unit cell is characterized by broadband, low profile and low loss. Due to the asymmetric structure, the proposed metasurface shows ... -
Broadrange Reflectarray Element with Combined Slot and Dielectric Resonator Resonances
(Společnost pro radioelektronické inženýrství, 2017-12)This paper presents a dielectric resonator antenna (DRA) reflectarray unit element with multiple loading circular slots underneath in concentric form. The radii of the three slots are varied simultaneously to function as ... -
Carrier Frequency Offset Estimation in OFDM systems as a Quadratic Eigenvalue Problem
(Společnost pro radioelektronické inženýrství, 2017-12)Carrier frequency offset (CFO) in orthogonal frequency division multiplexing (OFDM) systems is a major problem in achieving orthogonality between subcarriers. In this paper, we propose an estimator for CFO in OFDM systems ... -
Circularly Polarized Suspended Patch Antenna Fed by Modified L-Probe for UHF RFID Reader
(Společnost pro radioelektronické inženýrství, 2017-12)Two reader antennas, which are designed using the L-probe-fed suspended patch, are designed for the UHF band. To generate circular polarization, the L-shaped probe is modified by including an extra bend to provide one more ... -
Compact Bioimplantable MICS and ISM Band Antenna Design for Wireless Biotelemetry Applications
(Společnost pro radioelektronické inženýrství, 2017-12)A compact dual-band bioimplantable antenna with novel resonator geometry is designed for dual-band wireless biotelemetry applications in MICS and ISM bands. The radiating element geometry is based on an L-shaped transmission ... -
Design of a Novel Wideband Low-Scattering Shared Aperture Metasurface
(Společnost pro radioelektronické inženýrství, 2017-12)A novel shared aperture metasurface (SA-MS) for ultra-wideband radar cross section (RCS) reduction is designed and fabricated in this paper. The SA-MS is composed of a kind of perfect metamaterial absorber (PMA) and two ... -
A Design of Branch-Line Coupler with Harmonic Suppression and Size Reduction Using Closed-Loop and Open-Loop Resonators
(Společnost pro radioelektronické inženýrství, 2017-12)In this paper, a branch-line coupler using closed-loop and open-loop resonators with the operating frequency of 2.69 GHz is proposed. The designed microstrip circuit not only is able to suppress the second and the third ... -
DOA Estimation of Multiple LFM Sources Using a STFT-based and FBSS-based MUSIC Algorithm
(Společnost pro radioelektronické inženýrství, 2017-12)Direction of arrival (DOA) estimation is an important problem in array signal processing. An effective multiple signal classification (MUSIC) method based on the short-time Fourier transform (STFT) and forward/ backward ... -
Dual-Frequency Impedance Transformer Using Coupled-Line For Ultra-High Transforming Ratio
(Společnost pro radioelektronické inženýrství, 2017-12)In this paper, a new type of dual-frequency impedance transformer is presented for ultra-high transforming ratio. The proposed configuration consists of parallel coupled-line, series transmission lines and short-ended ... -
Evaluation of Blur and Gaussian Noise Degradation in Images Using Statistical Model of Natural Scene and Perceptual Image Quality Measure
(Společnost pro radioelektronické inženýrství, 2017-12)In this paper we present new method for classification of image degradation type based on Riesz transform coefficients and Blind/Referenceless Image Spatial Quality Evaluator (BRISQUE) that employs spatial coefficients. ... -
Evaluation of the Input Impedance and Impedance Quality Factor of a Dipole in Spatial and Spectral Domains
(Společnost pro radioelektronické inženýrství, 2017-12)In classic antenna analysis, there exist several methods of calculating input impedance when the source distribution of an antenna is known. The well-known induced EMF method, based on spatially distributed currents, is ... -
GPU-Accelerated 3D Mesh Deformation for Optimization Based on the Finite Element Method
(Společnost pro radioelektronické inženýrství, 2017-12)This paper discusses a strategy for speeding up the mesh deformation process in the design-by-optimization of high-frequency components involving electromagnetic field simulations using the 3D finite element method (FEM). ... -
Green Femtocell Networks through Joint Power Control and 3-Dimensional Pattern-Dependent Beamforming
(Společnost pro radioelektronické inženýrství, 2017-12)Femtocell technologies are used to extend radio coverage into buildings and provide wireless broadband access in residential, office or indoor hotspot environments. However, due to the radio spectrum scarcity, the femtocells ... -
Influence of Camera Setting on Vehicle-to-Vehicle VLC Employing Undersampled Phase Shift On-Off Keying
(Společnost pro radioelektronické inženýrství, 2017-12)This paper focuses on the performance analysis of a camera based vehicle-to-vehicle visible light communication system employing undersampled phase shift on-off keying modulation under interference scenario. Two Nissan ... -
Linear Array Pattern Synthesis Using An Improved Multiobjective Genetic Algorithm
(Společnost pro radioelektronické inženýrství, 2017-12)In this paper, we propose an improved nondominated sorting genetic algorithm-II with scope constrained (INSGA-II/SC) with three modifications, which are dynamic nondomination strategy, scope-constrained strategy, and front ...