Sum Rate Maximization for RSMA-Assisted CF mMIMO Networks With SWIPT Users
Diluka Galappaththige, Chintha Tellambura
Abstract
This letter develops a rate-splitting multiple access (RSMA)-assisted cell-free (CF) massive multiple input multiple output network comprising simultaneous wireless information and power transfer (SWIPT) users. Specifically, access points (APs) utilize RSMA to serve all users concurrently while minimizing inter-user interference and delivering more power to SWIPT users for energy harvesting. We develop optimal common and private beamforming at the APs and optimal power-splitting factors at users to maximize the user sum rate, subject to the users’ minimum rate and EH requirements. In comparison to the conventional CF SWIPT benchmark, the suggested system with 36 APs and 3 users delivers 28.2% of sum rate gain.