On the performance of iterative demapping and decoding techniques over quasi-static fading channels

Carson, W. R. and Chatzigeorgiou, I. and Wassell, I. J. and Rodrigues, M. R. D. and Carrasco, R. (2007) On the performance of iterative demapping and decoding techniques over quasi-static fading channels. In: Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on :. IEEE, New York, pp. 1522-1526. ISBN 978-1-4244-1143-6

Abstract

In this paper, we investigate in detail the performance of iterative demapping and decoding techniques over quasi-static fading channels both with and without antenna diversity. In particular, we consider the effect on the system performance of various mapping schemes, different coding schemes, the inter-leaver size as well as space diversity. Results demonstrate that over quasi-static fading channels characterized by significant antenna diversity, mappings traditionally optimized for iterative receivers (e.g., Boronka mapping) outperform mappings more appropriate for non-iterative receivers (e.g., Gray mapping). In contrast, over quasi-static fading channels characterized by limited antenna diversity, Gray mapping always outperform Boronka mapping for all E-b/N-0 and all iterations. Strikingly, this situation is in sharp contrast to that in the AWGN case. We note that we can further improve the performance of non-iterative systems (e.g., Gray mapping) having limited antenna diversity by increasing the memory size and removing the interleaving.