Improved detection in CDMA for biased sources

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

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

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


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