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: A High-Speed Four-Transmitter Four-Receiver MIMO OFDM Testbed: Experimental Results and Analyses | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 45401 Pages 1-10 DOI ASP 2006 45401 A High-Speed Four-Transmitter Four-Receiver MIMO OFDM Testbed Experimental Results and Analyses Weidong Xiang 1 Paul Richardson 1 Brett Walkenhorst 2 Xudong Wang 3 and Thomas Pratt2 1 ECE Department University of Michigan-Dearborn 126 ELB 4901 Evergreen Rd. Dearborn MI 48128 USA 2 Communications and Networking Division Information Technology and Telecommunications Laboratory Georgia Tech Research Institute Atlanta GA 30332-0832 USA 3Kiyon Company 4225 Executive Square Suite 290 La Jolla CA 92037 USA Received 30 November 2004 Revised 1 September 2005 Accepted 1 September 2005 By adopting multiple-input multiple-output MIMO and orthogonal frequency-division multiplexing OFDM technologies indoor wireless systems could reach data rates up to several hundreds of Mbits s and achieve spectral efficiencies of several tens of bits Hz s which are unattainable for conventional single-input single-output systems. The enhancements of data rate and spectral efficiency come from the fact that MIMO and OFDM schemes are indeed parallel transmission technologies in the space and frequency domains respectively. To validate the functionality and feasibility of MIMO and OFDM technologies we set up a four-transmitter four-receiver OFDM testbed in a typical indoor environment which achieves a peak data rate of 525 Mbits s and a spectral efficiency of Hz s. The performances including MIMO channel characteristics bit-error rate against signal-to-noise ratio curves the impairments of carrier frequency offset and channel estimation inaccuracy and an asymmetric MIMO scheme are reported and analyzed in this paper. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION Combination of multiple-input multiple-output MIMO and orthogonal frequency-division multiplexing OFDM technologies enables wireless communications .
