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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 Performance of Turbo Interference Cancellation Receivers in Space-Time Block Coded DS-CDMA Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 473796 9 pages doi 10.1155 2008 473796 Research Article Performance of Turbo Interference Cancellation Receivers in Space-Time Block Coded DS-CDMA Systems Derrick B. Mashwama and Emmanuel Oluremi Bejide Department of Electrical Engineering University ofCape Town Private Bag Rondebosch 7701 South Africa Correspondence should be addressed to Derrick B. Mashwama deemash@crg.ee.uct.ac.za Received 2 November 2007 Accepted 25 June 2008 Recommended by A. Lee Swindlehurst We investigate the performance of turbo interference cancellation receivers in the space time block coded STBC direct-sequence code division multiple access DS-CDMA system. Depending on the concatenation scheme used we divide these receivers into the partitioned approach PA and the iterative approach IA receivers. The performance of both the PA and IA receivers is evaluated in Rayleigh fading channels for the uplink scenario. Numerical results show that the MMSE front-end turbo space-time iterative approach receiver IA effectively combats the mixture of MAI and intersymbol interference ISI . To further investigate the possible achievable data rates in the turbo interference cancellation receivers we introduce the puncturing of the turbo code through the use of rate compatible punctured turbo codes RCPTCs . Simulation results suggest that combining interference cancellation turbo decoding STBC and RCPTC can significantly improve the achievable data rates for a synchronous DS-CDMA system for the uplink in Rayleigh flat fading channels. Copyright 2008 D. B. Mashwama and E. O. Bejide. 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 The presence of multiple access interference MAI in CDMA systems has led many researchers to
