2006/04/21 by Shental, Ori, Kanter, Ido
#FOS: Computer and information sciences #Information Theory (cs.IT)
paper · doi:10.48550/arxiv.cs/0604083
A K-user pseudo-orthogonal (PO) randomly spread CDMA system, equivalent to transmission over a subset of K'≤ K single-user Gaussian channels, is introduced. The high signal-to-noise ratio performance of the PO-CDMA is analyzed by rigorously deriving its asymptotic multiuser efficiency (AME) in the large system limit. Interestingly, the K'-optimized PO-CDMA transceiver scheme yields an AME which is practically equal to 1 for system loads smaller than 0.1 and lower bounded by 1/4 for increasing loads. As opposed to the vanishing efficiency of linear multiuser detectors, the derived efficiency is comparable to the ultimate CDMA efficiency achieved for the intractable optimal multiuser detector.