Tomáš Urbanec

Publications

2 Phase Noise Impact on BER in Space Communication

Authors: Tomáš Urbanec, Ondrej Baran, Miroslav Kasal, Petr Vagner

Abstract:

This paper deals with the modeling and the evaluation of a multiplicative phase noise influence on the bit error ratio in a general space communication system. Our research is focused on systems with multi-state phase shift keying modulation techniques and it turns out, that the phase noise significantly affects the bit error rate, especially for higher signal to noise ratios. These results come from a system model created in Matlab environment and are shown in a form of constellation diagrams and bit error rate dependencies. The change of a user data bit rate is also considered and included into simulation results. Obtained outcomes confirm theoretical presumptions.

Keywords: BER, bit error rate, AWGN, Additive thermal noise, multiplicative phase noise, phase shift keying

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1 Novel Approach for Wideband VNA by Sixport Principle

Authors: Tomáš Urbanec

Abstract:

Paper presents simple sixport principle and its frequency bandwidth. The novel multisixport approach is presented with its possibilities, typical parameters and frequency bandwidth. Practical implementation is shown with its measurement parameters and calibration. The bandwidth circa 1:100 is obtained.

Keywords: wideband, microwave measurement, sixport, VNA

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