论文标题
智能反射表面辅助毫米波MIMO完整双工系统
Intelligent Reflecting Surfaces Assisted Millimeter Wave MIMO Full Duplex Systems
论文作者
论文摘要
完整的双工（FD）系统的硬件成本非常高，功耗很高，以减轻模拟域中的自我干扰（SI）。此外，在毫米波（mmwave）中，他们依靠混合波束成形（HYBF）作为信号处理工具，可以部分处理SI，这表现出许多缺点，例如高插入损失和高功率消耗。本文建议将近场（NF-）IRS用于FD系统，目的是解决上述问题的成本效益。就是说，我们建议截断MMWave FD系统的模拟/混合边界形成阶段，并用NF-IRS对其进行补偿，同时且巧妙地控制上行链路（UL）和下行链路（DL）通道，同时辅助SI通道：这可以塑造非常强大的无源Si Cancellation。提出了一种新颖的关节主动和被动横梁成形设计，用于加权总和（WSR）最大化NF-IRS辅助MMWave点对点FD系统。结果表明，仅当IRS在NF中运行时，提出的解决方案才能充分收获的好处，与常规的大型MIMO（MMIMO）MMMWAVE FD和半双层（HD）系统相比，这会导致更高的增长。
Full duplex (FD) systems suffer from very high hardware cost and high power consumption to mitigate the self-interference (SI) in the analog domain. Moreover, in millimeter wave (mmWave) they rely on hybrid beamforming (HYBF) as a signal processing tool to partially deal with the SI, which presents many drawbacks such as high insertion loss and high power consumption. This article proposes the use of near-field (NF-) IRSs for FD systems with the objective to solve the aforementioned issues cost-efficiently. Namely, we propose to truncate the analog/hybrid beamforming stage of the mmWave FD systems and compensate it with an NF-IRS, to simultaneously and smartly control the uplink (UL) and downlink (DL) channels, while assisting in shaping the SI channel: this to obtain very strong passive SI cancellation. A novel joint active and passive beamforming design for the weighted sum-rate (WSR) maximization of a NF-IRS-assisted mmWave point-to-point FD system is presented. Results show that the proposed solution fully reaps the benefits of the IRSs only when they operate in the NF, which leads to considerably higher gains compared to the conventional massive MIMO (mMIMO) mmWave FD and half duplex (HD) systems.
