Browsing 2010/1 by Title
Now showing items 1-20 of 31
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Analysis for Design and Transformation of Autosynchronous State Machines
(Společnost pro radioelektronické inženýrství, 2010-04)The paper deals with design and transformation methodology of autosynchronous state machines. The result is the design methodology for autosynchronous state machines with one-hot and Gray encodings. On the basis of their ... -
Blind Oversampling Data Recovery with Low Hardware Complexity
(Společnost pro radioelektronické inženýrství, 2010-04)The paper is focused on the optimization and implementation of fully digital feed-forward blind oversampling CDR (BO-CDR). Two new phase-decision algorithms are proposed. Their complexity is very low, enabling a very simple ... -
Calculation and Comparison of Turbulence Attenuation by Different Methods
(Společnost pro radioelektronické inženýrství, 2010-04)This paper is focused on the effect of turbulence in atmospheric transmission media. A short introduction of the origin of turbulent atmosphere is given. Two classical methods for the calculation of turbulence attenuation ... -
Circularly Polarized Aperture Coupled Microstrip Antenna with Resonant Slots and a Screen
(Společnost pro radioelektronické inženýrství, 2010-04)A broadband circularly polarized (CP) Aperture Coupled Microstrip Antenna (ACMSA) is described herein. In order to decrease the back radiation of the antenna due to resonant coupling slots (a cross-slot) in the ground ... -
Closed-form Description of Microwave Signal Attenuation in Cellular Systems
(Společnost pro radioelektronické inženýrství, 2010-04)The reliable and accurate description of signal attenuation characteristics is important in the simulation and performance analysis of wireless communications systems. Recent works have provided analytical expres- sions ... -
A Color Image Watermarking Scheme Resistant against Geometrical Attacks
(Společnost pro radioelektronické inženýrství, 2010-04)The geometrical attacks are still a problem for many digital watermarking algorithms at present. In this paper, we propose a watermarking algorithm for color images resistant to geometrical distortions (rotation and scaling). ... -
Comparison of Fuzzy Logic and Genetic Algorithm Based Admission Control Strategies for UMTS System
(Společnost pro radioelektronické inženýrství, 2010-04)CDMA systems have so-called soft capacity, so the total number of possible sessions has not an exact value. The capacity of CDMA system depends on the interference level in the system. There are therefore RRM (Radio Resources ... -
Electrical Analogy to an Atomic Force Microscope
(Společnost pro radioelektronické inženýrství, 2010-04)Several applications of the atomic force microscopy (AFM), such as measurement of soft samples, manipulation with molecules, etc., require mechanical analysis of the AFM probe behavior. In this article we suggest the ... -
Electromagnetic Cylindrical Transparent Devices with Irregular Cross Section
(Společnost pro radioelektronické inženýrství, 2010-04)Electromagnetic transparent device is very important for antenna protection. In this paper, the material parameters for the cylindrical transparent devices with arbitrary cross section are developed based on the coordinate ... -
Estimating a Spectral Correlation Function under the Conditions of Imperfect Relation between Signal Frequencies and a Sampling Frequency
(Společnost pro radioelektronické inženýrství, 2010-04)This paper is devoted to the estimation of the spectral correlation function. The examined signal is a simple DSB-SC signal. The aim of the paper is discovering events connected with nonstandard relations between signal ... -
Feedback Compensation Algorithm for BPSK/QPSK Carrier Synchronization
(Společnost pro radioelektronické inženýrství, 2010-04)This paper deals with carrier synchronization problem in coherent communication system, such as BPSK and QPSK. First, this paper surveys and analyzes currently existing carrier synchronization algorithms and relevant ... -
FMCW Radar Performance for Atmospheric Measurements
(Společnost pro radioelektronické inženýrství, 2010-04)Frequency-modulated continuous-wave radars (FMCW) have been used in the investigation of the atmosphere since the late 1960’s. FMCW radars provide tremendous sensitivity and spatial resolution compared to their pulsed ... -
Global Evolutionary Algorithms in the Design of Electromagnetic Band Gap Structures with Suppressed Surface Waves Propagation
(Společnost pro radioelektronické inženýrství, 2010-04)The paper is focused on the automated design and optimization of electromagnetic band gap structures suppressing the propagation of surface waves. For the optimization, we use different global evolutionary algorithms like ... -
Impact of Different Active-Speech-Ratios on PESQ’s Predictions in Case of Independent and Dependent Losses (in Presence of Receiver-Side Comfort-Noise)
(Společnost pro radioelektronické inženýrství, 2010-04)This paper deals with the investigation of PESQ’s behavior under independent and dependent loss conditions from an Active-Speech-Ratio perspective in presence of receiver-side comfort-noise. This reference signal characteristic ... -
Lossless Authentication Watermarking Based on Adaptive Modular Arithmetic
(Společnost pro radioelektronické inženýrství, 2010-04)Reversible watermarking schemes based on modulo-256 addition may cause annoying salt-and-pepper noise. To avoid the salt-and-pepper noise, a reversible watermarking scheme using human visual perception characteristics and ... -
Minimum Configuration Insensitive Multifunctional Current-Mode Biquad Using Current Conveyors and All-Grounded Passive Components
(Společnost pro radioelektronické inženýrství, 2010-04)This paper proposes a new current conveyorbased high-output impedance single-input three-output current mode filter with minimum configuration. It contains two dual output second generation current conveyors, one third ... -
Modeling of Human Head Surface by Using Triangular B-Splines
(Společnost pro radioelektronické inženýrství, 2010-04)The paper deals with modeling of human head surface on the basis of quadratic triangular B-splines for the standard videocodec MPEG-4 SNHC. First, we define a triangular B-spline surface of any degree and then we present ... -
Modeling of the Phase Noise in Space Communication Systems
(Společnost pro radioelektronické inženýrství, 2010-04)Our work is focused on the investigation of an influence of an additive thermal noise and a multiplicative phase noise in space communication chains. The most important properties of both noise types are summarized. The ... -
Multicriteria Optimization of Antennas in Time-Domain
(Společnost pro radioelektronické inženýrství, 2010-04)An original approach to the time-domain multicriteria optimization of antennas is presented. For a given excitation pulse, the time-domain objective function takes the “time-domain impedance matching”, distortion of responses ... -
New Channel Coding Methods for Satellite Communication
(Společnost pro radioelektronické inženýrství, 2010-04)This paper deals with the new progressive channel coding methods for short message transmission via satellite transponder using predetermined length of frame. The key benefits of this contribution are modification and ...