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 sub-array-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.

中文翻译：

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全双工毫米波集成接入和回程网络的设计

未来蜂窝网络的关键技术之一是在毫米波（mmWave）频率下运行的支持全双工（FD）的集成接入和回程（IAB）网络。实现FD-IAB网络的主要挑战是减轻宽带mmWave频率中自干扰（SI）的影响。在本文中，我们首先介绍3GPP IAB网络架构和宽带mmWave信道模型。通过在FD-IAB节点上使用基于子阵列的混合预编码方案，可以在发射机处使用零强迫来减轻多用户干扰，而在成功部署天线和模拟消除之后的残留SI会被最小均方误差基带抵消接收器处的组合器。针对具有不同种类的移相器和信道不确定性的RF插入损耗（RFIL），评估了频谱效率（SE）。仿真结果表明，在存在不确定性的情况下，与半双工系统相比，在存在RFIL的情况下，与半双工系统相比，可以实现几乎两倍的SE，接近从完全连接的混合预编码获得的SE。