2010/4
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Recent Submissions
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On the Effect of Channel Impairments on VANETs Performance
(Společnost pro radioelektronické inženýrství, 2010-12)The primary means of studying the performance of vehicular ad hoc networks (VANETs) are computer simulations. Nowadays, the development of analytical models and the use of hybrid simulations that combine analytical modeling ... -
LMS Based Adaptive Channel Estimation for LTE Uplink
(Společnost pro radioelektronické inženýrství, 2010-12)In this paper, a variable step size based least mean squares (LMS) channel estimation (CE) algorithm is presented for a single carrier frequency division multiple access(SC-FDMA) system under the umbrella of the long term ... -
Key Information Retrieval in Hyperspectral Imagery through Spatial-Spectral Data Fusion
(Společnost pro radioelektronické inženýrství, 2010-12)Hyperspectral (HS) imaging is measuring the radiance of materials within each pixel area at a large number of contiguous spectral wavelength bands. The key spatial information such as small targets and border lines are ... -
Estimation of the Radio Channel Parameters using the SAGE Algorithm
(Společnost pro radioelektronické inženýrství, 2010-12)This paper presents the problem of estimating the parameters of a given number of superimposed signals, as is the case of the received signal in wireless communications. Based on the description of the received signal in ... -
Advanced Fuzzy Logic Based Admission Control for UMTS System
(Společnost pro radioelektronické inženýrství, 2010-12)The capacity of CDMA (Code Division Multiple Access) systems is interference limited. Therefore radio resources management (RRM) functions are used. They are responsible for supplying optimum coverage, ensuring efficient ... -
Electronically Tunable Current-Mode Quadrature Oscillator Using Single MCDTA
(Společnost pro radioelektronické inženýrství, 2010-12)This paper presents a modified current differencing transconductance amlpifier (MCDTA) and the MCDTA based quadrature oscillator. The oscillator is current-mode and provides current output from high output impedance ... -
Log-Polar Quantizer with the Embedded G.711 Codec
(Společnost pro radioelektronické inženýrství, 2010-12)In this paper a new two-dimensional vector quantizer for memoryless Gaussian source, realized in polar coordinates, is proposed. The G.711 codec is embedded in our vector quantizer, and therefore our vector quantizer is ... -
Simulation and Measurement of the Transmission Distortions of the Digital Television DVB-T/H Part 3: Transmission in Fading Channels
(Společnost pro radioelektronické inženýrství, 2010-12)The paper deals with the third (and last) part of results of the Czech Science Foundation research project that was aimed into the simulation and measurement of the transmission distortions of the digital terrestrial ... -
Optimization of the Gaussian Kernel Extended by Binary Morphology for Text Line Segmentation
(Společnost pro radioelektronické inženýrství, 2010-12)In this paper, an approach for text line segmentation by algorithm with the implementation of the Gaussian kernel is presented. As a result of algorithm, the growing area around text is exploited for text line segmentation. ... -
Investigating the Behavior of Compact Composite Descriptors in Early Fusion, Late Fusion and Distributed Image Retrieval
(Společnost pro radioelektronické inženýrství, 2010-12)In Content-Based Image Retrieval (CBIR) systems, the visual content of the images is mapped into a new space named the feature space. The features that are chosen must be discriminative and sufficient for the description ... -
Continental Fog Attenuation Empirical Relationship from Measured Visibility Data
(Společnost pro radioelektronické inženýrství, 2010-12)Free Space Optics (FSO) has the great potential for future communication applications. However, weather influenced reduced availability had been the main cause for its restricted growth. Among different weather influences ... -
Performance Analysis of Multiradio Transmitter with Polar or Cartesian Architectures Associated with High Efficiency Switched-Mode Power Amplifiers (invited paper)
(Společnost pro radioelektronické inženýrství, 2010-12)This paper deals with wireless multi-radio transmitter architectures operating in the frequency band of 800 MHz – 6 GHz. As a consequence of the constant evolution in the communication systems, mobile transmitters must be ... -
Broadband Approximations for Doubly Curved Reflector Antenna
(Společnost pro radioelektronické inženýrství, 2010-12)The broadband approximations for shaped-beam doubly curved reflector antennas with primary feed (rectangular horn) producing uniform amplitude and phase aperture distribution are derived and analyzed. They are very valuable ... -
Modular Filter Structures Using Current Feedback Operational Amplifiers
(Společnost pro radioelektronické inženýrství, 2010-12)The concept of the wave filtering is followed in the derivation of high-order filter topologies by employing Current Feedback Operational Amplifiers as active blocks. For this purpose, the wave equivalent of an appropriate ... -
Controlling the Short-Range Propagation Environment Using Active Frequency Selective Surfaces
(Společnost pro radioelektronické inženýrství, 2010-12)This paper deals with a new approach to the control of the propagation environment in indoor scenarios using intelligent walls. The intelligent wall is a conventional wall situated inside a building, but equipped with an ... -
Compensation-based Game for Spectrum Sharing in the Gaussian Interference Channel
(Společnost pro radioelektronické inženýrství, 2010-12)This paper considers an optimization problem of sum-rate in the Gaussian frequency-selective channel. We construct a competitive game with an asymptotically optimal compensation to approximate the optimization problem of ... -
Sensing Task Allocation for Heterogeneous Channels in Cooperative Spectrum Sensing
(Společnost pro radioelektronické inženýrství, 2010-12)In the traditional centralized cooperative spectrum sensing, all secondary users sense the same channel. But, for a given channel, there exists detection performance diversity among all the users, due to the different ... -
Optimum Detection Location-Based Cooperative Spectrum Sensing in Cognitive Radio
(Společnost pro radioelektronické inženýrství, 2010-12)Cognitive radio arises as a hot research issue in wireless communications recently, attributed to its capability of enhancing spectral efficiency and catering for the growing demand for bandwidth. As a good embodiment of ... -
DVCCs Based High Input Impedance Voltage-Mode First-Order Filters Employing Grounded Capacitor and Resistor
(Společnost pro radioelektronické inženýrství, 2010-12)A voltage-mode high input impedance first-order highpass, lowpass and allpass filters using two differential voltage current conveyors (DVCCs), one grounded capacitor and one grounded resistor is presented. The highpass, ... -
Distributed Multi-Commodity Network Flow Algorithm for Energy Optimal Routing in Wireless Sensor Networks.
(Společnost pro radioelektronické inženýrství, 2010-12)This work proposes a distributed algorithm for energy optimal routing in a wireless sensor network. The routing problem is described as a mathematical problem by the minimum-cost multi-commodity network flow problem. Due ...
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