Beamforming Design for Integrated Sensing and Wireless Power Transfer Systems

TL;DR

This paper introduces a novel integrated sensing and wireless power transfer system that combines radar sensing and power transfer in one hardware platform, optimizing beamforming to balance both functions.

Contribution

It proposes a semi-definite relaxation-based method and a low-complexity solution for optimizing beamforming in ISWPT systems, addressing the fundamental trade-off between sensing and power transfer.

Findings

Proposed globally optimal semi-definite relaxation approach.

Developed a low-complexity sub-optimal solution.

Numerical results demonstrate effective trade-off management.

Abstract

This letter proposes a new concept of integrated sensing and wireless power transfer (ISWPT), where radar sensing and wireless power transfer functions are integrated into one hardware platform. ISWPT provides several benefits from the integrating operation such as system size, hardware cost, power consumption, and spectrum saving, which is envisioned to facilitate future 6G wireless networks. As the initial study, we aim to characterizing the fundamental trade-off between radar sensing and wireless power transfer, by optimizing transmit beamforming vectors. We first propose a semi-definite relaxation-based approach to solve the corresponding optimization problem globally optimal, and then provide a low-complexity sub-optimal solution. Finally, numerical results verify the effectiveness of our proposed solutions, and also show the trade-off between radar sensing and wireless power transfer.