Improved detection in CDMA for biased sources

Hadar Efraim*, Nadav Yacov, Ori Shental, Ido Kanter, David Saad

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    We consider the detection of biased information sources in the ubiquitous code-division multiple-access (CDMA) scheme. We propose a simple modification to both the popular single-user matched-filter detector and a recently introduced near-optimal message-passing-based multiuser detector. This modification allows for detecting modulated biased sources directly with no need for source coding. Analytical results and simulations with excellent agreement are provided, demonstrating substantial improvement in bit error rate in comparison with the unmodified detectors and the alternative of source compression. The robustness of error-performance improvement is shown under practical model settings, including bias estimation mismatch and finite-length spreading codes. © 2007 IOP Publishing Ltd.

    Original languageEnglish
    Article number003
    Pages (from-to)9977-9985
    Number of pages9
    JournalJournal of Physics A: Mathematical and Theoretical
    Issue number33
    Publication statusPublished - 17 Aug 2007

    Bibliographical note

    © 2007 IOP Publishing Ltd


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