Suboptimal Decoding of Vector Quantization over a Frequency-Selective Rayleigh Fading CDMA Channel

Son X. NGUYEN  Ha H. NGUYEN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B   No.5   pp.1688-1691
Publication Date: 2006/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.5.1688
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
code-division multiple access,  combined source and channel coding,  vector quantization,  multiuser detection,  

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Summary: 
The complexity of the optimal decoding for vector quantization (VQ) in code-division multiple access (CDMA) communications prohibits implementation. It was recently shown in [1] that a suboptimal scheme that combines a soft-output multiuser detector and individual VQ decoders provides a flexible tradeoff between decoder's complexity and performance. The work in [1], however, only considers an AWGN channel model. This paper extends the technique in [1] to a frequency-selective Rayleigh fading channel. Simulation results indicate that such a suboptimal decoder also performs very well over this type of channel.