Browsing 2010/1 by Title
Now showing items 11-30 of 31
-
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 ... -
New Grounded and Floating Simulated Inductance Circuits using Current Differencing Transconductance Amplifiers
(Společnost pro radioelektronické inženýrství, 2010-04)Current differencing transconductance amplifier (CDTA) is receiving considerable attention as a building block for current-mode (CM) analog signal processing / signal generation. In this paper, new CDTA based lossless ... -
A New Method for Generating High Non-linearity S-Boxes
(Společnost pro radioelektronické inženýrství, 2010-04)Substitution boxes are important parts in many block and stream ciphers. The emergence of a range of crypto-attacks has led to the development of criteria for repelling such attacks. The non-linearity criterion provides ... -
Optical Fiber Distributed Sensing System Applied in Cement Concrete Commixture Research
(Společnost pro radioelektronické inženýrství, 2010-04)DTS are unique optical-fiber distributed systems for measuring of temperature or mechanical tension. These systems use non-linear properties of optical fibers. Optical fiber can therefore be used not only for telecommunication ... -
Other Computational Technique for Estimation of Lower Bound on Capacity of Two-Dimensional Diamond-1 Constrained Channel
(Společnost pro radioelektronické inženýrství, 2010-04)Computational technique for lower bound on Two-dimensional Diamond-1 constrained channel capacity is presented in this paper. It is basically an amalgamation of Matrix Fractal Grow Method (MFGM) and a new Matrix Fractal ... -
The PAPR and Simple PAPR Reduction of the 2D Spreading Based Communication Systems
(Společnost pro radioelektronické inženýrství, 2010-04)This paper deals with Peak to Average Power Ra- tio (PAPR) characteristics and the theory of variable spread- ing factor orthogonal frequency and code division multiplex- ing (VSF-OFCDM) systems. Comparison and evaluation ... -
Performance of Data Services in Cellular CDMA in Presence of Soft Handoff and Packet Combining
(Společnost pro radioelektronické inženýrství, 2010-04)Performance analysis of data services is studied in CDMA network in presence of soft handoff (HO) and packet combining. Packet combining in conjunction with soft handoff is found to enhance throughput, reduce delay and ... -
A Robust Threshold for Iterative Channel Estimation in OFDM Systems
(Společnost pro radioelektronické inženýrství, 2010-04)A novel threshold computation method for pilot symbol assisted iterative channel estimation in OFDM systems is considered. As the bits are transmitted in packets, the proposed technique is based on calculating a particular ... -
Simulation and Evaluation of CTP and Secure-CTP Protocols
(Společnost pro radioelektronické inženýrství, 2010-04)The paper discusses characteristics and qualities of two routing protocols – Collection Tree Protocol and its secure modification. The original protocol, as well as other protocols for wireless sensors, solves only problems ... -
Systematic Design of Fully Balanced Differential Current-Mode Multiple-Loop Feedback Filters Using CFBCCII
(Společnost pro radioelektronické inženýrství, 2010-04)In this paper, a systematic design method producing balanced current-mode filters is proposed, using current controlled fully balanced second-generation current conveyor circuit (CFBCCII). In this method, many kind of ... -
A Terrestrial Multiple-Receiver Radio Link Experiment at 10.7 GHz - Comparisons of Results with Parabolic Equation Calculations
(Společnost pro radioelektronické inženýrství, 2010-04)This work presents the results of a terrestrial multiple-receiver radio link experiment at 10.7 GHz. Results are shown in the form of the power levels recorded at several antennas attached to a receiving mast. Comparisons ...