  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.
