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This paper considers a broadcast multiple-input multiple-output (MIMO)network with multiple users and simultaneous wireless information and powertransfer (SWIPT). In this scenario, it is assumed that some users are able toharvest power from radio frequency (RF) signals to recharge batteries throughwireless power transfer from the transmitter, while others are servedsimultaneously with data transmission. The criterion driving the optimizationand design of the system is based on the weighted sum rate for the users beingserved with data. At the same time, constraints stating minimum per-userharvested powers are included in the optimization problem. This paper derivesthe structure of the optimal transmit covariance matrices in the case whereboth types of users are present simultaneously in the network, particularizingthe results to the cases where either only harvesting nodes or only informationusers are to be served. The tradeoff between the achieved weighted sum rate andthe powers harvested by the user terminals is analyzed and evaluated using therate-power (R-P) region. Finally, we propose a two-stage user groupingmechanism that decides which users should be scheduled to receive informationand which users should be configured to harvest energy from the RF signals ineach particular scheduling period, this being one of the main contributions ofthis paper.

User Grouping and Resource Allocation in Multiuser MIMO Systems under SWIPT