Improved detection in CDMA for biased sources

Hadar Efraim, Nadav Yacov, Ori Shental, Ido Kanter, David Saad
2007 Journal of Physics A: Mathematical and Theoretical  
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 matchedfilter 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
more » ... ement 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. Index Terms CDMA, biased sources, multiuser detection, source coding, bias mismatch.
doi:10.1088/1751-8113/40/33/003 fatcat:ottaep4dovct7k4pqdbj7jeo7e