Distributed turbo coding using log-likelihood thresholding for cooperative communications

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contributor.author Al-Habian, G. en_US
contributor.author Ghrayeb, A. en_US
contributor.author Hasna, M.O. en_US
contributor.author Abu-Dayya, A. en_US
date.accessioned 2009-12-27T09:20:36Z en_US
date.available 2009-12-27T09:20:36Z en_US
date.issued 2009-06-12 en_US
identifier.citation Al-Habian, G.; Ghrayeb, A.; Hasna, M.; Abu-Dayya, A., "Distributed turbo coding using log-likelihood thresholding for cooperative communications," Signals, Systems and Computers, 2008 42nd Asilomar Conference on , vol., no., pp.1005-1009, 26-29 Oct. 2008 en_US
identifier.uri http://dx.doi.org/10.1109/ACSSC.2008.5074563 en_US
identifier.uri http://hdl.handle.net/10576/10483 en_US
description.abstract In cooperative communications, error propagation at relays reduces the diversity order of the system. To combat that effect, we present a novel technique to control error propagation at the relays, which is presented in the context of a relay cooperating with a source to communicate with a destination using a turbo code. The relay calculates log-likelihood ratio (LLR) values for the bits sent from the source. These value are subjected to a threshold to selectively forward bits that are most reliable and discard bits that are less so, resulting in less errors propagating to the destination. We derive upper bounds on the bit-error rates for our proposed system and use them to optimize the threshold at the relay, showing that our system provides a better trade off between prevented errors and blocked correct bits. We compare our scheme with controlling error propagation using only a cyclic redundancy code(CRC) check at the relay, forwarding analog LLR values, and employing no error control at the relay at all. Based on system simulations, we show that our proposed scheme provides a significant diversity gain compared to other techniques. en_US
language.iso en en_US
publisher IEEE en
subject turbo coding en_US
subject log-likelihood thresholding en_US
subject cooperative communications en_US
title Distributed turbo coding using log-likelihood thresholding for cooperative communications en_US
type Article en_US


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