Auflistung 2012/2 nach Erscheinungsdatum
Anzeige der Dokumente 1-20 von 30
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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 ... -
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 ... -
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 ... -
Noise Parameters of CW Radar Sensors Used in Active Defense Systems
(Společnost pro radioelektronické inženýrství, 2012-06)Active defense represents an innovative way of protecting military vehicles. It is based on the employment of a set of radar sensors which detect an approaching threat missile and activate a suitable counter-measure. Since ... -
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 ... -
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 ... -
Third-order Intermodulation Reduction in Mobile Power Amplifiers by the First Stage Bias Control
(Společnost pro radioelektronické inženýrství, 2012-06)In this paper, the third order intermodulation distortion (IMD3) of three-stage power amplifier (PA) is analyzed using the Volterra series. The analysis explains how the total IMD3 of the three-stage power amplifier can ... -
RF Localization in Indoor Environment
(Společnost pro radioelektronické inženýrství, 2012-06)In this paper indoor localization system based on the RF power measurements of the Received Signal Strength (RSS) in WLAN environment is presented. Today, the most viable solution for localization is the RSS fingerprinting ... -
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 ... -
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 ... -
Wall Compensation for Ultra Wideband Applications
(Společnost pro radioelektronické inženýrství, 2012-06)Due to their low frequency contents, ultra wideband (UWB) signals have the ability to penetrate walls and obstacles. As the signal propagates through these obstacles, it gets attenuated, slows down, and gets dispersed. ... -
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, ... -
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 ... -
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 ... -
A novel JPEG steganography method based on modulus function with histogram analysis
(Společnost pro radioelektronické inženýrství, 2012-06)In this paper, we present a novel steganographic method for embedding of secret data in still grayscale JPEG image. In order to provide large capacity of the proposed method while maintaining good visual quality of ... -
Universality and Realistic Extensions to the Semi-Analytic Simulation Principle in GNSS Signal Processing
(Společnost pro radioelektronické inženýrství, 2012-06)Semi-analytic simulation principle in GNSS signal processing bypasses the bit-true operations at high sampling frequency. Instead, signals at the output branches of the integrate&dump blocks are successfully modeled, thus ... -
Time-Scale Domain Characterization of Time-Varying Ultrawideband Infostation Channel
(Společnost pro radioelektronické inženýrství, 2012-06)The time-scale domain geometrical-based method for the characterization of the time varying ultrawideband (UWB) channel typical of an infostation channel is presented. Compared to methods that use Doppler shift as a measure ... -
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 ... -
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 ... -
Watermarking FPGA Bitfile for Intellectual Property Protection
(Společnost pro radioelektronické inženýrství, 2012-06)Intellectual property protection (IPP) of hardware designs is the most important requirement for many Field Programmable Gate Array (FPGA) intellectual property (IP) vendors. Digital watermarking has become an innovative ...