An Efficient CDMA Decoder for Correlated Information Sources

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The authors consider the detection of correlated information sources in the ubiquitous Code-Division Multiple-Access (CDMA) scheme. They propose a message-passing based scheme for detecting correlated sources directly, with no need for source coding. The detection is done simultaneously over a block of transmitted binary symbols (word). Simulation results are provided demonstrating a substantial improvement in bit-error-rate in comparison with the unmodified detector and the alternative of source compression. The robustness of the error-performance improvement is shown under practical model settings, including wrong estimation of the generating Markov transition matrix and finite-length spreading codes.