Browsing 2017/4 by Issue Date
Now showing items 1-20 of 36
-
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 ... -
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 ... -
Overlapping White Blood Cells Detection Based on Watershed Transform and Circle Fitting
(Společnost pro radioelektronické inženýrství, 2017-12)White blood cell (WBC) count and segmentation is considered to be important step to diagnose diseases like leukemia, malaria etc. Automatic analysis of blood smear images will help hematologists to detect WBCs efficiently ... -
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 ... -
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 ... -
Micro-Diversity Analysis of Error Probability and Channel Capacity over Hoyt-Gamma Fading
(Společnost pro radioelektronické inženýrství, 2017-12)In wireless communication system, various parameters such as average symbol/bit error probability (ASEP/ABEP), outage probability and average channel capacity, etc. are studied for its performance analysis. In this paper, ... -
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 ... -
Novel Vestigial Sideband Modulation Scheme to Enhance the SNR in Radio Over Fiber Systems
(Společnost pro radioelektronické inženýrství, 2017-12)The optical single sideband (OSSB) scheme is a common choice in radio over fiber system for compensating chromatic dispersion (CD) but it suffers from low signal to noise ratio (SNR).We present the novel technique for SNR ... -
Signal Subspace Speech Enhancement with Oblique Projection and Normalization
(Společnost pro radioelektronické inženýrství, 2017-12)In this paper, a subspace speech enhancement method handling colored noise using oblique projection is proposed. Perceptual features and variance normalization are used to reduce residual noise and improve speech intelligibility ... -
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 ... -
Microwave Structural Health Monitoring Sensor for Deformation Measurement of Bended Steel Structures: Influence of Curvature Effect
(Společnost pro radioelektronické inženýrství, 2017-12)In this paper the utilization of microstrip antenna sensor for deformation monitoring in bended steel structures is presented. This kind of sensing element can be used in structural health monitoring systems. Deformation ... -
Ultra-Wideband RCS Reduction and Gain Enhancement of Aperture-Coupled Antenna Based on Hybrid-FSS
(Společnost pro radioelektronické inženýrství, 2017-12)A novel design of aperture-coupled microstrip antenna with ultra-wideband low radar cross section (RCS) is proposed. Hybrid frequency selective surface (FSS) structures consisting of two kinds of polarization-dependent ... -
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 ... -
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 ... -
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 ... -
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 ... -
RFID Tag Design Using Spiral Resonators and Defected Ground Structure
(Společnost pro radioelektronické inženýrství, 2017-12)This paper presents a simple generalized approach to design a compact chipless radio frequency identification tag. The proposed chipless tag encodes data into the spectral signature using a set of spiral resonators on both ... -
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 ... -
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 ... -
Tuning Range and Power Handling Analysis of DTC-based Matching Networks for Reconfigurable High Power RF Circuits
(Společnost pro radioelektronické inženýrství, 2017-12)This paper presents the analysis of tuning range and power handling of digitally tunable capacitors (DTCs) in reconfigurable high power RF circuits. The proposed scheme can be applied to reconfigurable RF system design ...