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Báo cáo hóa học: "Research Article On MIMO-OFDM with Coding and Loading"

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 On MIMO-OFDM with Coding and Loading | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 895654 7 pages doi 10.1155 2008 895654 Research Article On MIMO-OFDM with Coding and Loading Harry Z. B. Chen Lutz Lampe and Robert Schober Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada V6T1Z4 Correspondence should be addressed to Lutz Lampe lampe@ece.ubc.ca Received 12 November 2007 Revised 28 March 2008 Accepted 31 May 2008 Recommended by B. Sadler Orthogonal frequency-division multiplexing OFDM with multiple transmit and multiple receive antennas MIMO-OFDM is considered a candidate for high-data rate communication in various existing and forthcoming system standards. To achieve the usually desired low frame and bit error rates MIMO-OFDM should be combined with adaptive bit loading ABL and forward error correction FEC coding where the former is particularly apt for moderate mobility as considered in for example IEEE 802.16e OFDM systems. In this paper we investigate simple coding schemes and their combination with ABL for MIMO-OFDM. In particular we consider wrapped space-frequency coding WSFC and coded V-BLAST with ABL and optimize both schemes to mitigate error propagation inherent in the detection process. Simulation results show that bit-loaded WSFC and V-BLAST optimized for coded MIMO-OFDM achieve excellent error rate performances close to that of quasioptimal MIMO-OFDM based on singular value decomposition of the channel while their feedback requirements for loading are low. Copyright 2008 Harry Z. B. Chen 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 Orthogonal frequency-division multiplexing OFDM is a popular method for transmission over frequency-selective channels. For improved power and bandwidth .