A Soft Decoding Scheme for Vector Quantization over a CDMA Channel

H.H. Nguyen (Canada)

Keywords

Codedivision multiple access, combined source and chan nel coding, multiuser detection, soft decoding, vector quan tization.

Abstract

The optimal decoding of vector quantization (VQ) over a code-division multiple-access (CDMA) is too complicated for systems with a medium to large number of users. This paper presents a low-complexity, suboptimal decoder for VQ over a CDMA channel. The proposed decoder is built from a soft-output multiuser detector (MUD), a soft bit es timator and the optimal soft VQ decoding of an individual user. For each type of MUD, the soft-bit estimates are cal culated accordingly and then fed into the individual soft VQ decoders. Simulation results show that, with a lower complexity and good performance, the proposed decoding scheme is an attractive alternative to the more complicated optimal decoder.

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