TAILIEUCHUNG - Báo cáo hóa học: " Research Article Constrained Optimization of MIMO Training Sequences"

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 Constrained Optimization of MIMO Training Sequences | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 80857 13 pages doi 2007 80857 Research Article Constrained Optimization of MIMO Training Sequences Justin P. Coon and Magnus Sandell Toshiba Telecommunications Research Laboratory 32 Queen Square Bristol BS1 4ND UK Received 30 May 2006 Revised 22 November 2006 Accepted 11 January 2007 Recommended by Erchin Serpedin Multiple-input multiple-output MIMO systems have shown a huge potential for increased spectral efficiency and throughput. With an increasing number of transmitting antennas comes the burden of providing training for channel estimation for coherent detection. In some special cases optimal in the sense of mean-squared error MSE training sequences have been designed. However in many practical systems it is not feasible to analytically find optimal solutions and numerical techniques must be used. In this paper two systems unique word UW single carrier and OFDM with nulled subcarriers are considered and a method of designing near-optimal training sequences using nonlinear optimization techniques is proposed. In particular interior-point IP algorithms such as the barrier method are discussed. Although the two systems seem unrelated the cost function which is the MSE of the channel estimate is shown to be effectively the same for each scenario. Also additional constraints such as peak-to-average power ratio PAPR are considered and shown to be easily included in the optimization process. Numerical examples illustrate the effectiveness of the designed training sequences both in terms of MSE and bit-error rate BER . Copyright 2007 J. P. Coon and M. Sandell. 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 Future wireless systems can offer substantially higher data rates than .

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