Joint channel estimation and multiuser detection for multipath fading channels in DS-CDMA systems

Sau-Hsuan Wu*, C. C Jay Kuo

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


The technique of joint blind channel estimation and multiple access interference (MAI) suppression for an asynchronous code-division multiple-access (CDMA) system is investigated in this research. To identify and track dispersive time-varying fading channels and to avoid the phase ambiguity that come with the second-order statistic approaches, a sliding-window scheme using the expectation maximization (EM) algorithm is proposed. The complexity of joint channel equalization and symbol detection for all users increases exponentially with system loading and the channel memory. The situation is exacerbated if strong inter-symbol interference (ISI) exists. To reduce the complexity and the number of samples required for channel estimation, a blind multiuser detector is developed. Together with multi-stage interference cancellation using soft outputs provided by this detector, our algorithm can track fading channels with no phase ambiguity even when channel gains attenuate close to zero.

Original languageEnglish
Pages (from-to)181-191
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1 Dec 2002
EventEmerging Technologies for Future Generation Wireless Communications - Boston, MA, United States
Duration: 29 Jul 200230 Jul 2002


  • Blind channel estimation
  • EM algorithm
  • Multiuser detection


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