Coordinated multicell beamforming and power allocation for massive MIMO: A large system analysis

Abstract

This paper is concerned with coordinated multicell beamforming and power allocation for downlink massive multiple input and multiple output (MIMO) system. The design objective is to minimize the total transmit power under users’ signal to interference plus noise ratio (SINR) constraints. Another closely related optimization problem is to maximize the minimum of all users’ SINR values under a total power limitation, and we employ the relationship between the two problems to solve the former one. In particular, the power minimization problem can be transformed to a max-min SINR problem with an appropriate power limitation. This power limitation value is found by using the bisection method. Then, the max-min SINR problem is settled by solving a conditional eigenvalue problem. Note that the whole calculation process is done in the asymptotic regime where base station (BS) antenna number and user number both tend to infinity. Simulation results demonstrate that this algorithm is effective, and can achieve the near optimal performance with low complexity.