Energy Harvesting Enabled MIMO Relaying through Time Switching

TL;DR

This paper investigates a MIMO relay system that uses energy harvesting via time switching to power relaying, aiming to maximize data rate through optimal joint design of transmission and energy harvesting parameters.

Contribution

It provides a closed-form solution for joint relaying and time switching optimization in a MIMO SWIPT system, including an iterative scheme for general cases.

Findings

Closed-form solution for relaying and TS ratio when source covariance is identity

Iterative optimization scheme for joint source, relay, and TS ratio

Enhanced system rate through optimized energy harvesting and relaying strategies

Abstract

This letter considers simultaneous wireless information and power transfer (SWIPT) for a multiple-input multiple-output (MIMO) relay system. The relay is powered by harvesting energy from the source via time switching (TS) and utilizes the harvested energy to forward the information signal. Our aim is to maximize the rate of the system subject to the power constraints at both the source and relay nodes. In the first scenario in which the source covariance matrix is an identity matrix, we present the joint-optimal solution for relaying and the TS ratio in closed form. An iterative scheme is then proposed for jointly optimizing the source and relaying matrices and the TS ratio.