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SUMMARY:On the Performance of Iterative Demapping and Decoding Techniques 
 over Quasi-Static Fading Channels - William Carson\, Digital Technology Gr
 oup\, Computer Laboratory
DTSTART:20071207T143000Z
DTEND:20071207T153000Z
UID:TALK8634@talks.cam.ac.uk
CONTACT:Ioannis Chatzigeorgiou
DESCRIPTION:We investigate in detail the performance of iterative demappin
 g and decoding techniques over quasi-static fading channels both with and 
 without antenna diversity. In particular\, we consider the effect on the s
 ystem performance of various mapping schemes\, different coding schemes\, 
 the interleaver size as well as space diversity. Results demonstrate that 
 over quasi-static fading channels characterized by significant antenna div
 ersity\, mappings traditionally optimized for iterative receivers (e.g.\, 
 Boronka mapping) outperform mappings more appropriate for non-iterative re
 ceivers (e.g.\, Gray mapping). In contrast\, over quasi-static fading chan
 nels characterized by limited antenna diversity\, Gray mapping always outp
 erform Boronka mapping for all values of Eb/N0 and all iterations. Strikin
 gly\, this situation is in sharp contrast to that in the AWGN case. We not
 e that we can further improve the performance of non-iterative systems (e.
 g.\, Gray mapping) having limited antenna diversity by increasing the memo
 ry size and removing the interleaving.
LOCATION:Computer Laboratory\, Room SN08
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