Harvested Power Maximization in QoS-Constrained MIMO SWIPT with Generic RF Harvesting Model

TL;DR

This paper introduces an optimal joint design for transmit precoding and power splitting in MIMO SWIPT systems to maximize harvested power while satisfying QoS, using a generalized convex formulation for practical RF energy harvesting models.

Contribution

It presents a novel joint optimization framework for MIMO SWIPT that accounts for practical RF energy harvesting models, achieving optimal solutions for power maximization.

Findings

Achieves higher harvested power compared to benchmark schemes.

Provides insights into system parameter effects on energy harvesting.

Formulates a non-convex problem into an equivalent generalized convex form.

Abstract

We consider the problem of maximizing the harvested power in Multiple Input Multiple Output (MIMO) Simultaneous Wireless Information and Power Transfer (SWIPT) systems with power splitting reception. Different from recently proposed designs, we target with our novel problem formulation at the jointly optimal transmit precoding and receive uniform power splitting (UPS) ratio maximizing the harvested power, while ensuring that the Quality-of-Service (QoS) requirement of the MIMO link is satisfied. We assume generic practical Radio Frequency (RF) Energy Harvesting (EH) receive operation that results in a non-convex optimization problem for the design parameters, which we then solve optimally after formulating it in an equivalent generalized convex form. Our representative results including comparisons of achievable EH gains with benchmark schemes provide key insights on various system parameters.