Adaptive Transmission with Partial Channel Information in Spatially Correlated MIMO Channels

We propose a new adaptive multiple-input multiple-output (MIMO) transmission scheme that can work with partial channel information. Utilizing the information on dominant eigen-dimensions of the channel correlation matrix, the proposed scheme reduces the amount of channel information required for adaptive transmission without noticeable performance degradation. It is analytically shown that the proposed scheme can minimize the performance loss by properly choosing the number of eigen-dimensions of the channel correlation matrix. Simulation results show that the proposed scheme is quite applicable to practical systems where quantized channel information is utilized.