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 Space-Frequency Block Code with Matched Rotation for MIMO-OFDM System with Limited Feedback | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 231587 15 pages doi 2009 231587 Research Article Space-Frequency Block Code with Matched Rotation for MIMO-OFDM System with Limited Feedback Min Zhang 1 Thushara D. Abhayapala 1 Dhammika Jayalath 2 David Smith 3 and Chandra Athaudage4 1 College of Engineering Computer Science Australian National University Canberra ACT 0200 Australia 2 Faculty of Built Environment Engineering Queensland University of Technology Brisbane QLD 4001 Australia 3National ICT Australia Limited Canberra ACT 2601 Australia 4 Department of Electrical Electronic Engineering University of Melbourne Melbourne VIC 301 Australia Correspondence should be addressed to Thushara D. Abhayapala Received 30 November 2008 Revised 19 April 2009 Accepted 24 June 2009 Recommended by Markus Rupp This paper presents a novel matched rotation precoding MRP scheme to design a rate one space-frequency block code SFBC and a multirate SFBC for MIMO-OFDM systems with limited feedback. The proposed rate one MRP and multirate MRP can always achieve full transmit diversity and optimal system performance for arbitrary number of antennas subcarrier intervals and subcarrier groupings with limited channel knowledge required by the transmit antennas. The optimization process of the rate one MRP is simple and easily visualized so that the optimal rotation angle can be derived explicitly or even intuitively for some cases. The multirate MRP has a complex optimization process but it has a better spectral efficiency and provides a relatively smooth balance between system performance and transmission rate. Simulations show that the proposed SFBC with MRP can overcome the diversity loss for specific propagation scenarios always improve the system performance and demonstrate flexible performance with large performance gain. Therefore the proposed SFBCs with MRP demonstrate flexibility and .
