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Since Tse and Verdu proved that the global maximum likelihood (GML) detectorachieves unit asymptotic multiuser efficiency (AME) in the limit of largerandom spreading (LRS) CDMA, no suboptimal detector has been found to achieveunit AME. In this letter, we obtain that the WSLAS detector with a linearper-bit complexity achieves unit AME in the LRS-CDMA with a channel load < 1/2- 1/(4ln2) bits/s/Hz. For a practical system with any user number, a quasiLRS-CDMA is then proposed to approach the single-user performance in the highSNR regime.

A Family of Likelihood Ascent Search Multiuser Detectors: Approach to Single-User Performance via Quasi-Large Random Sequence CDMA