Browsing 2010/1 by Issue Date
Now showing items 1-20 of 31
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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Use of Multi-Watermarking Schema to Maintain Awareness in a Teleneurology Diagnosis Platform
(Společnost pro radioelektronické inženýrství, 2010-04)Following the tremendous evolution of transferring images through the Internet, it is necessary to ensure security during this act, especially for medical images. The application of multiple watermarking tech- nique ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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). ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ...