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

Sau-Hsuan Wu*, C. C Jay Kuo

*此作品的通信作者

研究成果: Conference article同行評審

摘要

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.

原文English
頁(從 - 到)181-191
頁數11
期刊Proceedings of SPIE - The International Society for Optical Engineering
4869
DOIs
出版狀態Published - 2002
事件Emerging Technologies for Future Generation Wireless Communications - Boston, MA, United States
持續時間: 29 7月 200230 7月 2002

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