论文标题

与硬件障碍的多IR辅助全双工系统的加权总和最大化

Weighted Sum-Rate Maximization for Multi-IRS-assisted Full-Duplex Systems with Hardware Impairments

论文作者

Saeidi, Mohammad Amin, Emadi, Mohammad Javad, Masoumi, Hamed, Mili, Mohammad Robat, Ng, Derrick Wing Kwan, Krikidis, Ioannis

论文摘要

可以通过利用精心设计的智能反射表面(IRS)来塑造通信渠道来建立智能和可重新配置的无线通信环境。在本文中,我们研究了多个IRS如何影响每个节点上硬件障碍的多用户全双工通信系统的性能,其中基站(BS)和上行链路用户将受到最大的传输功率约束。首先,派生的上行链路链接系统加权总数(SWSR)是系统性能指标。然后,我们为最大化SWSR的最大化作为优化问题制定资源分配设计,该问题共同优化了BS处的波束形成和组合向量,上行链路用户的传输功率以及多个IRS的相位变化。由于SWSR优化问题是非凸的,因此提出了一种有效的迭代交替方法,以获得考虑的设计问题的次优点,并还讨论了其复杂性。特别是,我们首先将主要问题重新制定为等效加权的最小均方形形式,然后将其转换为几个凸子问题,可以在给定的相移时进行分析解决。然后,通过基于梯度上升的算法优化IRSS相。最后,提出数值结果,以阐明多个IRS如何增强硬件损害下的性能指标。

Smart and reconfigurable wireless communication environments can be established by exploiting well-designed intelligent reflecting surfaces (IRSs) to shape the communication channels. In this paper, we investigate how multiple IRSs affect the performance of multi-user full-duplex communication systems under hardware impairment at each node, wherein the base station (BS) and the uplink users are subject to maximum transmission power constraints. Firstly, the uplink-downlink system weighted sum-rate (SWSR) is derived which serves as a system performance metric. Then, we formulate the resource allocation design for the maximization of SWSR as an optimization problem which jointly optimizes the beamforming and the combining vectors at the BS, the transmit powers of the uplink users, and the phase shifts of multiple IRSs. Since the SWSR optimization problem is non-convex, an efficient iterative alternating approach is proposed to obtain a suboptimal solution for the design problem considered and its complexity is also discussed. In particular, we firstly reformulate the main problem into an equivalent weighted minimum mean-square-error form and then transform it into several convex sub-problems which can be analytically solved for given phase shifts. Then, the IRSs phases are optimized via a gradient ascent-based algorithm. Finally, numerical results are presented to clarify how multiple IRSs enhance the performance metric under hardware impairment.

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