tailieunhanh - Báo cáo hóa học: " An Implementation of Nonlinear Multiuser Detection in Rayleigh Fading Channel"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An Implementation of Nonlinear Multiuser Detection in Rayleigh Fading Channel | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 45647 Pages 1-9 DOI WCN 2006 45647 An Implementation of Nonlinear Multiuser Detection in Rayleigh Fading Channel Wai Yie Leong 1 2 John Homer 1 and Danilo P. Mandic2 1 School of Information Technology and Electrical Engineering The University of Queensland Brisbane QLD 4072 Australia 2 Communications and Signal Processing Group Department of Electrical and Electronic Engineering Imperial College London South Kensington Campus London SW7 2AZ UK Received 14 May 2005 Revised 12 December 2005 Accepted 6 February 2006 Recommended for Publication by David I. Laurenson A blind nonlinear interference cancellation receiver for code-division multiple-access- CDMA- based communication systems operating over Rayleigh flat-fading channels is proposed. The receiver which assumes knowledge of the signature waveforms of all the users is implemented in an asynchronous CDMA environment. Unlike the conventional MMSE receiver the proposed blind ICA multiuser detector is shown to be robust without training sequences and with only knowledge of the signature waveforms. It has achieved nearly the same performance of the conventional training-based MMSE receiver. Several comparisons and experiments are performed based on examining BER performance in AWGN and Rayleigh fading in order to verily the validity of the proposed blind ICA multiuser detector. Copyright 2006 Wai Yie Leong et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION In mobile communication systems multiuser detection is also known under the names of cochannel interference suppression multiuser demodulation or interference cancellation and requires rather complicated high-precision power control. The design of multiuser detectors