EURASIP Journal on Advances in Signal Processing
Volume 2009 (2009), Article ID 231587, 15 pages
doi:10.1155/2009/231587
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

1College of Engineering & Computer Science, Australian National University, Canberra, ACT 0200, Australia
2Faculty of Built Environment & Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia
3National ICT Australia Limited, Canberra, ACT 2601, Australia
4Department of Electrical & Electronic Engineering, University of Melbourne, Melbourne, VIC 301, Australia

Received 30 November 2008; Revised 19 April 2009; Accepted 24 June 2009

Academic Editor: Markus Rupp

Copyright © 2009 Min Zhang 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.

Abstract

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 feasibility so that it is more suitable for a practical MIMO-OFDM system with dynamic parameters.