Asymptotic analysis of iterative channel estimation and multiuser detection with soft feedback in multipath channels
2008 (English)In: 16th European Signal Processing Conference (EUSIPCO 2008), 2008Conference paper (Refereed)
Large system analysis of a randomly spread direct-sequencecode-division multiple-access system in a frequency-selective channelis considered. The receiver uses iterative channel estimationand multiuser detection (MUD) with soft feedback from single-userdecoders to refine both the decisions of the linear minimum meansquare error (LMMSE) MUD, and the initial pilot-based estimatesof the LMMSE channel estimator. Replica method, a tool fromstatistical physics, and density evolution with Gaussian approximationare used to obtain the asymptotic performance of the LMMSEMUD with soft parallel interference cancellation. The results indicatethat as the channel coherence time grows, the performance ofcorresponding single-user system having perfect channel state informationcan be approached even in an overloaded multiuser systemusing channel estimation and vanishing pilot overhead.
Place, publisher, year, edition, pages
Signal Processing Telecommunications
IdentifiersURN: urn:nbn:se:kth:diva-78621OAI: oai:DiVA.org:kth-78621DiVA: diva2:492696
16th European Signal Processing Conference (EUSIPCO 2008). Lausanne, Switzerland. August 25-29, 2008
QC 201205142012-02-082012-02-082012-05-14Bibliographically approved