2008/4
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Recent Submissions
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Design of Microstrip Band Pass Fractal Filter for Suppression of Spurious Band
(Společnost pro radioelektronické inženýrství, 2008-12)In this paper, the design and subsequent fabrication of a hairpin-line band pass filter has been proposed. This filter exhibits periodic frequency response. By proper design, the spurious bands are being suppressed ... -
A New CAC Method Using Queuing Theory
(Společnost pro radioelektronické inženýrství, 2008-12)The CAC (Connection Admission Control) method plays an important role in the ATM (Asynchronous Transfer Mode) network environment. The CAC is the first step in the prevention of congested states in the network topology, ... -
An Efficient Finger Allocation Method for the Maximum Likelihood RAKE Receiver
(Společnost pro radioelektronické inženýrství, 2008-12)In wideband wireless communication systems the RAKE receiver is commonly used to collect the resolvable multipath energy and counter the effects of fading through diversity. However, in channels with large delay and energy ... -
Optimization of Micro Strip Array Antennas Using Hybrid Particle Swarm Optimizer with Breeding and Subpopulation for Maximum Side-Lobe Reduction
(Společnost pro radioelektronické inženýrství, 2008-12)In this paper, a technique based on hybrid particle swarm optimiser with breeding and subpopulation is presented for optimal design of reconfigurable dual-beam linear array antennas and planar arrays. In the amplitudephase ... -
Slotted PIFA for Mobile Communication Devices
(Společnost pro radioelektronické inženýrství, 2008-12)Slotted PIFA with capacitive loading for operation in the 880 / 960 MHz band is presented. The PIFA is intended for mobile terminals in GSM mobile communication network. The antenna is placed on a ground plane with dimensions ... -
Utilization of Faraday Mirror in Fiber Optic Current Sensors
(Společnost pro radioelektronické inženýrství, 2008-12)Fiber optic sensors dispose of some advantages in the field of electrical current and magnetic field measurement, like large bandwidth, linearity, light transmission possibilities. Unfortunately, they suffer from some ... -
Parametric Study of Mushroom-like and Planar Periodic Structures in Terms of Simultaneous AMC and EBG Properties
(Společnost pro radioelektronické inženýrství, 2008-12)In the paper, the parametric analysis of a mushroom-like and a planar metallo-dielectric periodic structure with square unit cell and metallic patch is presented. First, the angular stability for different unit cell settings ... -
Shielding Effectiveness of Laminated Shields
(Společnost pro radioelektronické inženýrství, 2008-12)Shielding prevents coupling of undesired radiated electromagnetic energy into equipment otherwise susceptible to it. In view of this, some studies on shielding effectiveness of laminated shields with conductors and conductive ... -
The Time Difference of Arrival Estimation of Wi-Fi Signals
(Společnost pro radioelektronické inženýrství, 2008-12)The papers deals with a modeling of a Time- Difference of Arrival system for a subscriber station localization, based on the 802.11 standard wireless network. In the case of severe multipath effects the standard TDOA ... -
Eyelid Localization for Iris Identification
(Společnost pro radioelektronické inženýrství, 2008-12)This article presents a new eyelid localization algorithm based on a parabolic curve fitting. To deal with eyelashes, low contrast or false detection due to iris texture, we propose a two steps algorithm. First, possible ... -
Application of a Cumulative Method for Car Borders Specification in Image
(Společnost pro radioelektronické inženýrství, 2008-12)The paper deals with low-level car detection methods in images. The car detection is an integral part of all intelligent car cruise systems. This article describes the method for suppression of the edges produced by classical ... -
A New Application of Current Conveyors: The Design of Wideband Controllable Low-Noise Amplifiers
(Společnost pro radioelektronické inženýrství, 2008-12)The aim of this paper is three-fold. First, it reviews the low-noise amplifier and its relevance in wireless communications receivers. Then it presents an exhaustive review of the existing topologies. Finally, it introduces ... -
Numerical Modeling of Magnetic Field Deformation as Related to Susceptibility Measured with an MR System
(Společnost pro radioelektronické inženýrství, 2008-12)The possibility is studied of numerical modeling of magnetic field deformations in the environment of measured diamagnetic and paramagnetic samples for the purposes of studying magnetic resonance (MR) image deformations ... -
Synthesizing Sierpinski Antenna by Genetic Algorithm and Swarm Optimization
(Společnost pro radioelektronické inženýrství, 2008-12)The paper discusses the synthesis of the Sierpinski antenna operating at three prescribed frequencies: 0.9 GHz, 1.8 GHz (both GSM) and 2.4 GHz (Bluetooth). In order to synthesize the antenna, a genetic algorithm and a ... -
ACE Strategy with Virtual Channels
(Společnost pro radioelektronické inženýrství, 2008-12)Cochlear implant is an electronic device, which can mediate hearing sensations to profoundly deaf people. Contemporary cochlear implants are sophisticated electronic devices; however, their performance could still be ... -
Enhancement of Optical Coherence Tomography Images of the Retina by Normalization and Fusion
(Společnost pro radioelektronické inženýrství, 2008-12)This paper describes an image processing method applied to Optical Coherence Tomography (OCT) images of the retina. The aim is to achieve improved OCT images from the fusion of sequential OCT scans obtained at identical ... -
Implementation and Evaluation of Power Consumption of an Iris Pre-processing Algorithm on Modern FPGA
(Společnost pro radioelektronické inženýrství, 2008-12)In this article, the efficiency and applicability of several power reduction techniques applied on a modern 65nm FPGA is described. For image erosion and dilation algorithms, two major solutions were tested and compared ... -
Recent Techniques in Design and Implementation of Microwave Planar Filters
(Společnost pro radioelektronické inženýrství, 2008-12)This paper details the techniques and initiatives made recently for improved response and simultaneous development of microwave planar filters. Although the objective of all the techniques is to design low cost filters ... -
EMC of Frequency Controlled Electric Drives
(Společnost pro radioelektronické inženýrství, 2008-12)The paper deals with solution possibilities of EMC for voltage inverters, which uses PWM (Pulse Width Modulation). The paper offers solution of interference suppression which is raised by operation of frequency controlled ... -
EMC Increasing of PWM Rectifier in Comparison with Classical Rectifier
(Společnost pro radioelektronické inženýrství, 2008-12)Pulse width modulated rectifier is a very popular topic nowadays. The modern industrial production demands continuous and lossless conversion of electrical energy parameters. This need leads to wide spread of power ...
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