Multi-antenna Wireless Powered Communication with Co-channel Energy and Information Transfer

TL;DR

This paper proposes an optimal joint beamforming strategy for multi-antenna wireless powered communication systems with co-channel energy and information transfer, maximizing data rate while managing interference.

Contribution

It introduces a closed-form optimal solution for joint energy and information beamforming in co-channel WPC systems, balancing energy transfer and interference mitigation.

Findings

Optimal energy beamforming improves energy transfer efficiency.

Joint optimization outperforms reference schemes.

Closed-form solution simplifies implementation.

Abstract

This letter studies a multi-antenna wireless powered communication (WPC) system with co-channel energy and information transfer, where a wireless device (WD), powered up by wireless energy transfer (WET) from an energy transmitter (ET), communicates to an information receiver (IR) over the same frequency band. We maximize the achievable data rate from the WD to the IR by jointly optimizing the energy beamforming at the ET and the information beamforming at the WD, subject to their individual transmit power constraints. We obtain the optimal solution to this problem in closed-form, where the optimal energy beamforming at the ET achieves a best energy/interference tradeoff between maximizing the energy transfer efficiency to the WD and minimizing the co-channel interference to the IR. Numerical results show that our proposed optimal co-channel design is superior to other reference schemes.