Imperial College London > Talks@ee.imperial > COMMSP Seminar > Analytical Modeling of Soft Noise and Performance Evaluation of Mutual Information Based Soft Forwarding Relays

Analytical Modeling of Soft Noise and Performance Evaluation of Mutual Information Based Soft Forwarding Relays

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The speaker will present an analytical framework to evaluate the error performance of the mutual information based forwarding (MIF) scheme for a memoryless parallel relay network in both additive white Gaussian noise and Rayleigh fading channels. The analytical expression for soft noise variance is first derived. The derived soft noise variance only relies on the transmit signal-to-noise ratio (SNR), without the need of the knowledge of actual or estimated information bits. A tight upper bound of soft noise variance is also derived which can be calculated from a Q-function table. The unknown distribution of the total noise at the destination is examined by two goodness of fit approaches, known as Quantile-Quantile plot construction and Kolmogorov Smirnov test. Based on these normality testing results, we approximate the distribution of the total noise as Gaussian. Then we derive approximate bit error rate (BER) expressions for a parallel relay network employing MIF scheme. The derived soft noise variance and system BER expressions are shown to be in tight match with simulation results. Furthermore, it is shown that MIF scheme in slow Rayleigh fading channels can achieve full diversity subject to the availability of soft noise variance at the destination. Simulation results reveal that MIF scheme yields about 1.8 dB SNR gains compared to the various full diversity achieving schemes previously reported in the literature.

Bio: Jinhong Yuan received the B.E. and Ph.D degrees in electronics engineering from Beijing Institute of Technology, Beijing, China, in 1991 and 1997, respectively. From 1997 to 1999 he was a Research Fellow at the School of Electrical Engineering, the University of Sydney, Sydney, Australia. In 2000 he joined the School of Electrical Engineering and Telecommunications, the University of New South Wales, Sydney, Australia, where he is currently a Professor for Telecommunications of the school. He has published two books, two book chapters and over 150 papers in telecommunications journals and conference proceedings. He is the IEEE NSW Chapter Chair for Joint Com/SP/OE. His current research interests include wireless and mobile communications, communication theory, transmitter and receiver algorithms designs.

This talk is part of the COMMSP Seminar series.

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