paper

IRS Meets Relaying: Joint Resource Allocation and Passive Beamforming Optimization

arXiv:2104.03579 · doi:10.1109/LWC.2021.3092222

Abstract

Intelligent reflecting surface (IRS) has recently emerged as a new solution to enhance wireless communication performance via passive signal reflection. In this letter, we unlock the potential of IRS controller in relaying information and propose a novel IRS-assisted communication system with both IRS passive reflection and active relaying. Specifically, we jointly optimize the time allocations for decode-and-forward (DF) relaying by the IRS controller and the IRS passive beamforming to maximize the achievable rate of the proposed system. We also compare the rate performance of the proposed system with the conventional IRS without relaying, and reveal the conditions for one to outperform the other. Simulation results demonstrate that the proposed new design can significantly improve the coverage/rate performance of IRS-assisted systems.

To increase the IRS coverage range without increasing the deployment/hardware cost, we propose a novel IRS-assisted communication system by "unlocking the IRS controller for relaying information" in addition to its conventional role of tuning the reflections of IRS elements only

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