One of the key technologies for the future cellular networks is full duplex
(FD)-enabled integrated access and backhaul (IAB) networks operating in the
millimeter-wave (mmWave) frequencies. The main challenge in realizing FD-IAB
networks is mitigating the impact of self-interference (SI) in the wideband
mmWave frequencies. In this article, we first introduce the 3GPP IAB network
architectures and wideband mmWave channel models. By utilizing the
subarray-based hybrid precoding scheme at the FD-IAB node, multiuser
interference is mitigated using zero-forcing at the transmitter, whereas the
residual SI after successfully deploying antenna and analog cancellation is
canceled by a minimum mean square error baseband combiner at the receiver. The
spectral efficiency (SE) is evaluated for the RF insertion loss (RFIL) with
different kinds of phase shifters and channel uncertainty. Simulation results
show that, in the presence of the RFIL, the almost double SE, which is close to
that obtained from fully connected hybrid precoding, can be achieved as
compared to half duplex systems when the uncertainties are of low strength
