Concavity Approximation Based Power Allocation in Millimeter-Wave MIMO Systems

This paper investigates the power allocation in millimeter-wave multiple-input multiple-output systems. The asymptotic concavity of the sum rate of the system is utilized to form the proposed power allocation approach. In contrast to the traditional approaches, the proposed approach utilizes a channel asymptotic orthogonality-based approximation which is more suitable, thus achieves higher spectral efficiency. The analysis demonstrates that the sum rate of the system increases as the number of antennas increases. Numerical results verify the analysis and show that the proposed approach can perform better than those traditional approaches.