3 research outputs found
Performance Comparison Between A Simple Full-Duplex Multi-Antenna Relay And A Passive Intelligent Reflecting Surface
In this paper, we propose a single RF-chain multi-antenna full-duplex (FD)
relay built with -bit analog phase shifters and passive self-interference
cancellation. The hardware complexity of the proposed FD relay with 2-bit
quantized analog phase shifters is on the same order as the hardware complexity
of a passive intelligent reflecting surface (IRS). Next, 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. We then compare the achievable data rate of the proposed FD
relaying system with the achievable data rate of the same system but with the
FD relay replaced by an ideal passive IRS. Our results show that the proposed
relaying system with 2-bit quantized analog phase shifters can significantly
outperform the IRS-assisted system. Intuitively, the IRS system is in
disadvantage since there the total transmit power is used entirely by the
source, whereas in the FD relaying system the total power is shared by
the source and the FD relay in addition to the noise-cleansing process
performed by the decode-and-forwarding at the FD relay