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báo cáo hóa học:" Research Article Limited Feedback Multiuser MIMO Techniques for Time-Correlated Channels"

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 Limited Feedback Multiuser MIMO Techniques for Time-Correlated Channels | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 104950 21 pages doi 10.1155 2009 104950 Research Article Limited Feedback Multiuser MIMO Techniques for Time-Correlated Channels Eduardo Zacarias B Stefan Werner and Risto Wichman Department of Signal Processing and Acoustics Helsinki University of Technology P.O. Box 3000 02015 Helsinki Finland Correspondence should be addressed to Eduardo Zacarias B ezacaria@signal.hut.fi Received 1 December 2008 Revised 28 April 2009 Accepted 8 July 2009 Recommended by Nihar Jindal This work presents limited feedback schemes for closed-loop multiple-input multiple-output systems using frequency division duplex. The proposed methods employ compact feedback messages in order to a feed back and track a complete frequencyflat channel matrix to be used as input to multiuser multiplexing methods designed for full channel side information CSI at the transmitter and b enable the receiver to command the transmit weight adaptation in order to maximize the link reliability under strong intercell interference. Simulations show that the channel feedback accuracy provided by the proposed algorithms produces a negligible bit error probability BEP performance loss in low mobility scenarios compared to the full CSI performance and that the proposed interference rejection techniques can effectively exploit an estimate of the interference statistics in order to enable multiple-stream communications under the permanent presence of intercell interference signals. Copyright 2009 Eduardo Zacarias B 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 Wireless communications with multiple antennas at transmitter and receiver ends have the potential of offering high data rates and spectral efficiency. On one hand the data .