We present a new turbo multiuser detector for turbo-coded direct sequence code division multiple access (DS-CDMA) systems. The proposed detector is based on the utilization of a parallel interference cancellation (PIC) and a bank of turbo decoders. The PIC is broken up in order to perform interference cancellation after each constituent decoder of the turbo decoding scheme. Moreover, in the paper we propose a new enhanced algorithm that provides a more accurate estimation of the signal-to-noise-plus-interference-ratio used in the tentative decision device and in the MAP decoding algorithm. The performance of the proposed receiver is evaluated by means of computer simulations for medium to very high system loads, in AWGN and multipath fading channel, and compared to recently proposed interference cancellation-based iterative MUD, by taking into account the number of iterations and the complexity involved. We will see that the proposed receiver outperforms the others especially for highly loaded systems.
This article is part of the series Improved CDMA Detection Techniques for Future Wireless Systems.
Research Article Improved Iterative Parallel Interference Cancellation Receiver for Future Wireless DS-CDMA Systems
Electronics and Telecommunication Department, University of Florence, Via di S. Marta 3, Firenze 50139, Italy
EURASIP Journal on Advances in Signal Processing 2005, 2005:613580 doi:10.1155/ASP.2005.626
The electronic version of this article is the complete one and can be found online at: http://asp.eurasipjournals.com/content/2005/5/613580
| Received: | 1 August 2003 |
| Published: | 20 April 2005 |
© 2005 Morosi et al.
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