Paper Info
Title
Adaptive iterative soft-input soft-output parallel decision-feedback detectors for asynchronous coded DS-CDMA systems
Abstract
The optimum and many suboptimum iterative soft-input soft-output (SISO) multiuser detectors require a priori information about the multiuser system, such as the users' transmitted signature waveforms, relative delays, as well as the channel impulse response. In this paper, we employ adaptive algorithms in the SISO multiuser detector in order to avoid the need for this a priori information. First, we derive the optimum SISO parallel decision-feedback detector for asynchronous coded DS-CDMA systems. Then, we propose two adaptive versions of this SISO detector, which are based on the normalized least mean square (NLMS) and recursive least squares (RLS) algorithms. Our SISO adaptive detectors effectively exploit the a priori information of coded symbols, whose soft inputs are obtained from a bank of single-user decoders. Furthermore, we consider how to select practical finite feedforward and feedback filter lengths to obtain a good tradeoff between the performance and computational complexity of the receiver.
Year
DOI
Venue
2005
10.1155/WCN.2005.155
Eurasip Journal on Wireless Communications and Networking
Keywords
DocType
Volume
adaptive version,siso multiuser detector,siso adaptive detector,parallel decision-feedback detector,multiuser system,optimum siso parallel decision-feedback,ds-cdma system,siso detector,adaptive algorithm,channel impulse response,multiuser detector
Journal
2005
Issue
ISSN
Citations 
2
1687-1499
0
PageRank 
References 
Authors
0.34
14
3
Name
Order
Citations
PageRank
Wei Zhang114312.84
Claude D'Amours24412.78
Abbas Yongaçoglu310723.19