Decision-feedback interference suppression in CDMA systems: a ML-based semiblind approach

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• 作者：Bugallo ; Mó ; nica F. ; Mí ; guez ; Joaquí ; n ; Castedo ; Luis
• 关键词：Decision feedback ; Maximum likelihood ; Multiuser detection ; Semiblind receivers ; Interference suppression ; CDMA
• 刊名：Signal Processing
• 出版年：2003
• 出版时间：October, 2003
• 年：2003
• 卷：83
• 期：10
• 页码：2179-2193
• 全文大小：409 K

文摘

This paper addresses the problem of interference suppression in direct sequence code division multiple access systems. We propose a novel semiblind decision feedback (DF) receiver based on the maximum likelihood principle that simultaneously exploits the transmission of training sequences and the statistical information of the unknown transmitted symbols. Both iterative and adaptive implementations of the proposed receiver, derived within the framework of the expectation maximization algorithm, are presented. Computer simulations show that the resulting multiuser detectors attain practically the same performance as the theoretical DF minimum mean square error receiver.