Allocation of transmit power in Spatially-correlated dual-hop MIMO relay channels

This paper considers power allocation in spatially-correlated dual-hop multiple-input multiple-output (MIMO) relay channels under power constraint for each hop channel. The proposed scheme allocates the transmit power considering the spatial correlation as well as the average signal-to-noise ratio (SNR) of dual-hop MIMO relay channels. By means of upper-bound analysis, the proposed scheme can minimize the transmit power, while maximizing the end-to-end capacity of spatially-correlated MIMO channel. Simulation results show that the proposed scheme can provide performance enhancement over the SNR-based scheme in spatially-correlated channel environments.