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 Transmit Delay Structure Design for Blind Channel Estimation over Multipath Channels | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 26123 12 pages doi 2007 26123 Research Article Transmit Delay Structure Design for Blind Channel Estimation over Multipath Channels Tongtong Li 1 Qi Ling 1 and Zhi Ding2 1 Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48824 USA 2 Department of Electrical and Computer Engineering University of California Davis CA95616 USA Received 20 April 2006 Revised 16 October 2006 Accepted 11 February 2007 Recommended by Alex Gershman Wireless communications often exploit guard intervals between data blocks to reduce interblock interference in frequency-selective fading channels. Here we propose a dual-branch transmission scheme that utilizes guard intervals for blind channel estimation and equalization. Unlike existing transmit diversity schemes in which different antennas transmit delayed zero-padded or time-reversed versions of the same signal in the proposed transmission scheme each antenna transmits an independent data stream. It is shown that for systems with two transmit antennas and one receive antenna as in the case of one transmit antenna and two receive antennas blind channel estimation and equalization can be carried out based only on the second-order statistics of symbol-rate sampled channel output. The proposed approach involves no preequalization and has no limitations on channel-zero locations. Moreover extension of the proposed scheme to systems with multiple receive antennas and or more than two transmit antennas is discussed. It is also shown that in combination with the threaded layered space-time TST architecture and turbo coding significant improvement can be achieved in the overall system performance. Copyright 2007 Tongtong Li et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any .
