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We consider the problem of maximizing the harvested power in Multiple InputMultiple Output (MIMO) Simultaneous Wireless Information and Power Transfer(SWIPT) systems with power splitting reception. Different from recentlyproposed designs, with our optimization problem formulation we target for thejointly optimal transmit precoding and receive uniform power splitting (UPS)ratio maximizing the harvested power, while ensuring that thequality-of-service requirement of the MIMO link is satisfied. We assumepractical Radio-Frequency (RF) energy harvesting (EH) receive operation thatresults in a non-convex optimization problem for the design parameters, whichwe first formulate in an equivalent generalized convex problem that we thensolve optimally. We also derive the globally optimal transmit precoding designfor ideal reception. Furthermore, we present analytical bounds for the keyvariables of both considered problems along with tight high signal-to-noiseratio approximations for their optimal solutions. Two algorithms for theefficient computation of the globally optimal designs are outlined. The firstrequires solving a small number of non-linear equations, while the second isbased on a two-dimensional search having linear complexity. Computer simulationresults are presented validating the proposed analysis, providing key insightson various system parameters, and investigating the achievable EH gains overbenchmark schemes.

Transmit Precoding and Receive Power Splitting for Harvested Power Maximization in MIMO SWIPT Systems