Space-Time Coding with Feedback
Space-time coding for a Multiple-Input,Multiple-Output (MIMO) system with feedback and Maximum-Likehood (ML)-decoding is considered. In the case that complete feedback from the receiver to the transmitter is available, the optimal structure of the codes is shown to have the form cu+, where c is a T-dimensional complex vector (T is a time delay), and u is a unit-norm eigenvector corresponding to the largest eigenvalue of matrix HH+ (H is the channel matrix and + means the transpose and conjugate). Moreover, criterion for designing vector c is obtained. In the case that only finite-bit feedback is available, the optimal structure of the codes is proved to have the form cp+, where c is also a T-dimensional complex vector and p is a M-dimensional vector with unit-norm (M is the transmit number of the system).Furthermore, criteria for designing vectors c and p are given. A Lloyd-like algorithm to approach p is introduced.
Haiquan Wang En-hui Yang
Dept.of ECE, University of Waterloo, Waterloo, ON N2L 3G1 Canada
国际会议
2006年IEEE信息理论国际会议(Proceedings of 2006 IEEE Information Theory Workshop ITW06)
成都
英文
438-442
2006-10-22（万方平台首次上网日期，不代表论文的发表时间）