tailieunhanh - Báo cáo hóa học: " Efficient Closed-Loop Schemes for MIMO-OFDM-Based WLANs"

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: Efficient Closed-Loop Schemes for MIMO-OFDM-Based WLANs | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID91919 Pages 1-10 DOI ASP 2006 91919 Efficient Closed-Loop Schemes for MIMO-OFDM-Based WLANs Xiayu Zheng 1 Yi Jiang 2 and Jian Li1 1 Department of Electrical and Computer Engineering University of Florida Gainesville FL 32611-6130 USA 2 Department of Electrical and Computer Engineering University of Colorado Boulder CO 80309-0425 USA Received 28 December 2005 Revised 18 July 2006 Accepted 13 August 2006 The single-input single-output SISO orthogonal frequency-division multiplexing OFDM systems for wireless local area networks WLAN defined by the IEEE standard can support data rates up to 54 Mbps. In this paper we consider deploying two transmit and two receive antennas to increase the data rate up to 108 Mbps. Applying our recent multiple-input multipleoutput MIMO transceiver designs that is the geometric mean decomposition GMD and the uniform channel decomposition UCD schemes we propose simple and efficient closed-loop MIMO-OFDM designs for much improved performance compared to the standard singular value decomposition SVD based schemes as well as the open-loop V-BLAST vertical Bell Labs layered space-time based counterparts. In the explicit feedback mode precoder feedback is needed for the proposed schemes. We show that the overhead of feedback can be made very moderate by using a vector quantization method. In the time-division duplex TDD mode where the channel reciprocity is exploited our schemes turn out to be robust against the mismatch between the uplink and downlink channels. The advantages of our schemes are demonstrated via extensive numerical examples. Copyright 2006 Xiayu Zheng 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 The single-input single-output SISO

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