Reconfigurable Intelligent Surface With Energy Harvesting Assisted Cooperative Ambient Backscatter Communications

TL;DR

This paper proposes an energy-harvesting reconfigurable intelligent surface to improve cooperative ambient backscatter communications, optimizing power consumption while maintaining quality of service.

Contribution

It introduces a novel RIS-assisted CABC system with energy harvesting capability and develops an effective optimization algorithm for power minimization.

Findings

The proposed algorithm effectively reduces RIS power consumption.

Simulation results confirm the algorithm's efficiency.

RIS with energy harvesting enhances CABC system performance.

Abstract

The performance of cooperative ambient backscatter communications (CABC) can be enhanced by employing reconfigurable intelligent surface (RIS) to assist backscatter transmitters. Since the RIS power consumption is a non-negligible issue, we consider a RIS assisted CABC system where the RIS with energy harvesting circuit can not only reflect signal but also harvest wireless energy. We study a transmission design problem to minimize the RIS power consumption with the quality of service constraints for both active and backscatter transmissions. The optimization problem is a mixed-integer non-convex programming problem which is NP-hard. To tackle it, an algorithm is proposed by employing the block coordinate descent, semidefinite relaxation and alternating direction method of multipliers techniques. Simulation results demonstrate the effectiveness of the proposed algorithm.