tailieunhanh - Báo cáo hóa học: " Research Article A Unified Approach to BER Analysis of Synchronous Downlink CDMA Systems with Random "

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: Research Article A Unified Approach to BER Analysis of Synchronous Downlink CDMA Systems with Random | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 346465 12 pages doi 2008 346465 Research Article A Unified Approach to BER Analysis of Synchronous Downlink CDMA Systems with Random Signature Sequences in Fading Channels with Known Channel Phase M. Moinuddin A. U. H. Sheikh A. Zerguine and M. Deriche Electrical Engineering Department KingFahd University of Petroleum Minerals KFUPM Dhahran 31261 Saudi Arabia Correspondence should be addressed to A. Zerguine azzedine@ Received 19 March 2007 Revised 14 August 2007 Accepted 12 November 2007 Recommended by Sudharman K. Jayaweera A detailed analysis of the multiple access interference MAI for synchronous downlink CDMA systems is carried out for BPSK signals with random signature sequences in Nakagami-m fading environment with known channel phase. This analysis presents a unified approach as Nakagami-m fading is a general fading distribution that includes the Rayleigh the one-sided Gaussian the Nakagami-q and the Rice distributions as special cases. Consequently new explicit closed-form expressions for the probability density function pdf of MAI and MAI plus noise are derived for Nakagami-m Rayleigh one-sided Gaussian Nakagami-q and Rician fading. Moreover optimum coherent reception using maximum likelihood ML criterion is investigated based on the derived statistics of MAI plus noise and expressions for probability of bit error are obtained for these fading environments. Furthermore a standard Gaussian approximation SGA is also developed for these fading environments to compare the performance of optimum receivers. Finally extensive simulation work is carried out and shows that the theoretical predictions are very well substantiated. Copyright 2008 M. Moinuddin 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 .