tailieunhanh - Báo cáo hóa học: " Improved Iterative Parallel Interference Cancellation Receiver for Future Wireless DS-CDMA Systems"

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: Improved Iterative Parallel Interference Cancellation Receiver for Future Wireless DS-CDMA Systems | EURASIP Journal on Applied Signal Processing 2005 5 626-634 2005 Hindawi Publishing Corporation Improved Iterative Parallel Interference Cancellation Receiver for Future Wireless DS-CDMA Systems Simone Morosi Electronics and Telecommunication Department University of Florence Via di S. Marta 3 Firenze 50139 Italy Email morosi@ Romano Fantacci Electronics and Telecommunication Department University of Florence Via di S. Marta 3 Firenze 50139 Italy Email fantacci@ Andrea Bernacchioni Electronics and Telecommunication Department University of Florence Via di S. Marta 3 Firenze 50139 Italy Email bernacchioni@ Received 1 August 2003 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 access parallel interference cancellation turbo multiuser detection iterative detection and decoding nonlinear MMSE soft decision. 1. INTRODUCTION One of the main shortages of the code division multiple access CDMA communication systems can be identified

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