Open Access

Improved Iterative Parallel Interference Cancellation Receiver for Future Wireless DS-CDMA Systems

EURASIP Journal on Advances in Signal Processing20052005:613580

https://doi.org/10.1155/ASP.2005.626

Received: 1 August 2003

Published: 20 April 2005

Abstract

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.

Keywords and phrases

code division multiple accessparallel interference cancellationturbo multiuser detectioniterative detection and decodingnonlinear MMSE soft decision

Authors’ Affiliations

(1)
Electronics and Telecommunication Department, University of Florence

Copyright

© Morosi et al. 2005