Browsing 2012/2 by Title
Now showing items 1-20 of 30
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Achievable Outage Rates In Cognitive Radio Networks under Imperfect Spectrum Sensing
(Společnost pro radioelektronické inženýrství, 2012-06)In this paper, we aim at deriving the outage rates achieved by the primary user due spectrum sensing in a cognitive radio network, that we call sensing-induced primary outage rates. To reach this goal, in the first step, ... -
A CMOS DCCII with a Grounded Capacitor Based Cascadable All-Pass Filter Application
(Společnost pro radioelektronické inženýrství, 2012-06)The differential current conveyor (DCCII) is a versatile current-mode active element, which has a current differencing capability. In this study, a new CMOS DCCII implementation is introduced. As an application example, a ... -
Cross-Correlation-Function-Based Multipath Mitigation Method for Sine-BOC Signals
(Společnost pro radioelektronické inženýrství, 2012-06)Global Navigation Satellite Systems (GNSS) positioning accuracy indoor and urban canyons environments are greatly affected by multipath due to distortions in its autocorrelation function. In this paper, a cross-correlation ... -
Design of a 2.4 GHz High-Performance Up-Conversion Mixer with Current Mirror Topology
(Společnost pro radioelektronické inženýrství, 2012-06)In this paper, a low voltage low power up-conversion mixer, designed in a Chartered 0.18 μm RFCMOS technology, is proposed to realize the transmitter front-end in the frequency band of 2.4 GHz. The up-conversion mixer uses ... -
Downlink Video Streaming for Users Non-Equidistant from Base Station
(Společnost pro radioelektronické inženýrství, 2012-06)We consider multiuser video transmission for users that are non-equidistantly positioned from base station. We propose a greedy algorithm for video streaming in a wireless system with capacity achieving channel coding, ... -
Dual-Mode Dual-Band Microstrip Bandpass Filter Based on Fourth Iteration T-Square Fractal and Shorting Pin
(Společnost pro radioelektronické inženýrství, 2012-06)A new class of dual mode microstrip fractal resonator is proposed and developed for miniaturization of the dual band bandpass filter. The perimeter of the proposed resonator is increased by employing fourth iteration ... -
Fuzzy Logic and Singular Value Decomposition based Through Wall Image Enhancement
(Společnost pro radioelektronické inženýrství, 2012-06)Singular value decomposition based through wall image enhancement is proposed which is capable of discriminating target, noise and clutter signals. The overlapping boundaries of clutter, noise and target signals are separated ... -
High Dynamic Range RF Front End with Noise Cancellation and Linearization for WiMAX Receivers
(Společnost pro radioelektronické inženýrství, 2012-06)This research deals with verification of the high dynamic range for a heterodyne radio frequency (RF) front end. A 2.6 GHz RF front end is designed and implemented in a hybrid microwave integrated circuit (HMIC) for worldwide ... -
Hybrid Coding Technique for Pulse Detection in an Optical Time Domain Reflectometer
(Společnost pro radioelektronické inženýrství, 2012-06)The paper introduces a novel hybrid coding technique for improved pulse detection in an optical time domain reflectometer. The hybrid schemes combines Simplex codes with signal averaging to articulate a very sophisticated ... -
Improving Link Reliability through Network Coding in Cooperative Cellular Networks
(Společnost pro radioelektronické inženýrství, 2012-06)The paper proposes a XOR-based network coded cooperation protocol for the uplink transmission of relay assisted cellular networks and an algorithm for selection and assignment of the relay nodes. The performances of the ... -
Influence of Intermetallic Compounds on RF Resistance of Joints Soldered with Lead Free Alloys
(Společnost pro radioelektronické inženýrství, 2012-06)During soldering process intermetallic compounds as a reaction between solder and substrate are created. Physical properties of those compounds are different to properties of solder and substrate. The influence of intermetallic ... -
Linear Phase Second Order Recursive Digital Integrators and Differentiators
(Společnost pro radioelektronické inženýrství, 2012-06)In this paper, design of linear phase second order recursive digital integrators and differentiators is discussed. New second order integrators have been designed by using Genetic Algorithm (GA) optimization method. ... -
Low-Voltage Ultra-Low-Power Current Conveyor Based on Quasi-Floating Gate Transistors
(Společnost pro radioelektronické inženýrství, 2012-06)The field of low-voltage low-power CMOS technology has grown rapidly in recent years; it is an essential prerequisite particularly for portable electronic equipment and implantable medical devices due to its influence on ... -
Measurement and Simulation of Coaxial to Microstrip Transitions' Radiation Properties and Substrate Influence
(Společnost pro radioelektronické inženýrství, 2012-06)A radiation and electro-magnetic (EM) field analysis of coaxial-to-microstrip transitions is presented. Radiation is quantified by simulation and measurement of a crosstalk between two Omni-Spectra's transitions using ... -
Measurement of Dielectric Properties at 75 - 325 GHz using a Vector Network Analyzer and Full Wave Simulator
(Společnost pro radioelektronické inženýrství, 2012-06)This paper presents a fast and easy to use method to determine permittivity and loss tangent in the frequency range of 75 to 325 GHz. To obtain the permittivity and the loss tangent of the test material, the reflection and ... -
Miniaturization of Branch-Line Coupler Using Composite Right/Left-Handed Transmission Lines with Novel Meander-shaped-slots CSSRR
(Společnost pro radioelektronické inženýrství, 2012-06)A novel compact-size branch-line coupler using composite right/left-handed transmission lines is proposed in this paper. In order to obtain miniaturization, composite right/left-handed transmission lines with novel ... -
Miniaturized Wideband Bandpass Filter with Wide Stopband using Metamaterial-based Resonator and Defected Ground Structure
(Společnost pro radioelektronické inženýrství, 2012-06)This paper presents a miniaturized wideband bandpass filter with wide stopband performance. It is shown that the coupled metamaterial-based resonators (MBRs) incorporating with the defected ground structure (DGS) can ... -
The Model of the Low Rate Telemetry Communication System for Matlab-Simulink
(Společnost pro radioelektronické inženýrství, 2012-06)This article is dedicated to the model of low rate telemetry system, which has been developed for Matlab-Simulink environment. The purpose of this model is a research of the low rate telemetry transmission reliability in ... -
A Modified Bipolar Translinear Cell with Improved Linear Range and Its Applications
(Společnost pro radioelektronické inženýrství, 2012-06)This paper presents a technique to extend the linear input voltage range of a sinh mixed translinear cell proposed by Fabre [1]. This technique extends the linear operation range of the circuit by inserting common-anode-connected ... -
A Multiband CPW-Fed Slot Antenna with Fractal Stub and Parasitic Line
(Společnost pro radioelektronické inženýrství, 2012-06)This paper presents a multiband CPW-fed slot antenna with fractal stub and parasitic line. The conventional wideband slot antenna with fractal stub is modified by inserting the parasitic line surrounding the fractal stub ...