Optimal Power Allocation for Correlated Rayleigh Fading MIMO Wireless Systems With Statistic Information Feedback

In telecommunication field, channel capacity is the tightest upper bound on the amount of information that can be reliably transmitted over a communications channel. In this paper, the authors investigate how to increase information throughput to approach the capacity of a wireless communications system using Multiple-Input Multiple-Output (MIMO) technique. When statistic information is available at the transmitter, they can improve the information throughput by optimizing the input covariance matrix of the transmitter. Efficient design of the optimal input covariance matrix, however, remains unavailable although its eigenvector structure was clearly revealed. In this paper, they obtain an upper bound of the capacity by matrix operation and concavity of the capacity function.