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Báo cáo hóa học: " Department of Electrical Engineering, Texas A&M "

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: Department of Electrical Engineering, Texas A&M | EURASIP Journal on Applied Signal Processing 2004 9 1238-1245 2004 Hindawi Publishing Corporation Upper Bounds on the BER Performance of MTCM-STBC Schemes over Shadowed Rician Fading Channels M. Uysal Department of Electrical and Computer Engineering University of Waterloo Waterloo ON Canada N2L 3G1 Email muysal@ece.uwaterloo.ca C. N. Georghiades Department of Electrical Engineering Texas A M University College Station TX 77843-3128 USA Email georghiades@ee.tamu.edu Received 17 May 2003 Revised 21 October 2003 Space-time block coding STBC provides substantial diversity advantages with a low decoding complexity. However these codes are not designed to achieve coding gains. Outer codes should be concatenated with STBC to provide additional coding gain. In this paper we analyze the performance of concatenated trellis-coded STBC schemes over shadowed Rician frequency-flat fading channels. We derive an exact pairwise error probability PEP expression that reveals the dominant factors affecting performance. Based on the derived PEP in conjunction with the transfer function technique we also present upper bounds on the bit error rate BER which are further shown to be tight through a Monte-Carlo simulation study. Keywords and phrases space-time block coding trellis-coded modulation Rician fading channels shadowing pairwise error probability. 1. INTRODUCTION Space-time trellis coding was introduced in 1 as an effective transmit diversity technique to combat fading. These codes were designed to achieve maximum diversity gain. However for a fixed number of transmit antennas their decoding complexity increases exponentially with the transmission rate. Space-time block coding STBC 2 was proposed as an attractive alternative to its trellis counterpart with a much lower decoding complexity. The work in 2 was inspired by Alamouti s early work 3 where a simple two-branch transmit diversity scheme was presented and shown to provide the same diversity order as maximal-ratio receiver .