Rate Maximization for Cell-Free Massive MIMO with Low-Resolution ADCs

In this paper, it presents a sum rate maximization power optimization problem for downlink cell-free massive multiple-input multiple-output (CF-mMIMO) system with low-resolution analog-to-digital converters (ADCs) at the access points (APs) and users, subjecting to the quality-of-service (QoS) constraint and each AP power constraint. To handle this non-convex issue, we explore successive convex approximation (SCA) technique and convert the original problem to a series of second-order-cone programs (SOCPs). The motivation of SCA is to substitute the non-convex term by its convex approximation. Numerical results indicate our proposed algorithm has a fast convergence rate. In addition, compared with the case of no power optimization, the proposed SCA algorithm permits a huge performance gain.