Power Optimization of Cell Free massive MIMO with Zero-forcing Beamforming Technique

Abstract

A Cell Free massive MIMO, comprising a very large number of distributed access points (APs) is a promising technology to provide high data rate, spectral efficiency (SE), and energy efficiency (EE). In this paper, zero-forcing (ZF) beamforming is used since it is free from self-interference. This paper considers Cell Free massive MIMO with ZF beamforming. Here, the power control coefficient and access point power are jointly optimized to improve the Signal-to-interference-plus-noise ratio (SINR) and rate of the system. The original problem is decomposed into two sub-problems and is then optimized individually. Lagrange method is applied to solve the optimization problem efficiently. It is observed that the maximum SINR and rate of downlink improve considerably.