A Simple Single RF-Chain Multi-Antenna Full-Duplex Relay Can Outperform An Intelligent Reflecting Surface
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In this paper, we propose a single RF-chain multi-antenna full-duplex (FD) relay build with b-bit analog phase shifters. Assuming only passive self-interference cancellation at the FD relay, we derive the achievable data rate of a system comprised of a source, the proposed FD relay, and a destination. Next, we compare the data rate of the proposed FD relaying system with the data rate of the same system but with the FD relay replaced by an ideal intelligent reflecting surface (IRS). Our results show that the relaying system with 2-bit quantized analog phase shifters can significantly outperform the IRS system.
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