# A Generic Receiver Architecture for MIMO Wireless Power Transfer with Non-Linear Energy Harvesting

## TL;DR

This paper introduces a versatile MIMO wireless power transfer receiver architecture with adaptive power splitting, optimizing energy beamforming and rectifier ratios to enhance non-linear RF-to-DC conversion efficiency.

## Contribution

A novel generic receiver architecture with multiple antennas and rectifiers, enabling joint optimization for improved wireless power transfer efficiency under practical non-linear energy harvesting models.

## Key findings

- Significant increase in harvested DC power compared to conventional designs
- Effective joint optimization of beamforming and power splitting ratios
- Exploitation of non-linearity leads to notable performance gains

## Abstract

This letter investigates a multiple-input multiple-output (MIMO) wireless power transfer (WPT) system under practical non-liner energy harvesting (EH) models. We propose a new generic energy receiver (ER) architecture consisting of $N$ receive antennas and $L$ rectifiers, for which one power splitter is inserted after each antenna to adaptively split the received radio frequency (RF) signals among the $L$ rectifiers for efficient non-linear RF-to-direct current (DC) conversion. With the proposed architecture, we maximize the total harvested DC power at the ER, by jointly optimizing the transmit energy beamforming at the energy transmitter (ET) and the power splitting ratios at the ER. Numerical results show that our proposed design by exploiting the nonlinearity of EH significantly improves the harvested DC power at the ER, as compared to two conventional designs.