Joint Pilot and Data Power Control in Cell-Fee Massive MIMO System

This paper delves into the resource allocation problem in the fifth generation (5G) of wireless networks. Thus, we consider a recently-emerged transformation of the massive multiple-input multiple-output (mMIMO) systems known as cell-free mMIMO (CF-mMIMO) system. To this end, the uplink achievable data rate of the CF-mMIMO system with different transmitted pilot and data powers and maximum-ratio combining (MRC) is obtained. Then, joint pilot and data power control optimization problem with the max-min fairness uplink rate among the users subject to limited energy budget in a coherence interval is presented. To tackle with the non-convexity of the problem, we relax the original problem into a generalized geometric programming (GGP) which is proven to be tight. Moreover, simulation results are presented to illustrate the benefits of the proposed optimization problem.