MIMO SWIPT Systems with Power Amplifier Nonlinearities and Memory Effects

TL;DR

This paper investigates how nonlinear high power amplifiers with memory effects impact SWIPT systems, deriving the rate-energy region and proposing predistortion techniques to mitigate performance degradation, resulting in significant improvements.

Contribution

It introduces a comprehensive analysis of HPA nonlinearities with memory effects on SWIPT, and proposes a predistortion method to enhance the rate-energy trade-off.

Findings

HPA nonlinearities significantly degrade the RE region.

Predistortion improves the RE region by approximately 24%.

Performance gains are demonstrated for both power-splitting and time-splitting architectures.

Abstract

In this letter, we study the impact of nonlinear high power amplifier (HPA) on simultaneous wireless information and power transfer (SWIPT), for a point-to-point multiple-input multiple-output communication system. We derive the rate-energy (RE) region by taking into account the HPA nonlinearities and its associated memory effects. We show that HPA significantly degrades the achievable RE region, and a predistortion technique is investigated for compensation. The performance of the proposed predistortion scheme is evaluated in terms of RE region enhancement. Numerical results demonstrate that approximately 24% improvement is obtained for both power-splitting and time-splitting SWIPT architectures.