Double-Active-IRS Aided Wireless Communication With Total Amplification Power Constraint
Double-Active-IRS Aided Wireless Communication With Total Amplification Power Constraint
复制标题
具有总放大功率限制的双主动 IRS 辅助无线通信
DOI：
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Beixiong Zheng
中科院分区：
文献类型：
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作者：
Xinhao Li;Changsheng You;Zhenyu Kang;Yunpu Zhang;Beixiong Zheng
在这封信中，我们考虑由两个有源智能反射表面（IRS）辅助的无线通信系统的下行链路通信，其中多天线基站（BS）仅通过双反射链路为单天线用户提供服务。通过联合设计 BS 波束成形以及元件分配、放大功率分配和两个有源 IRS 的放置（受总放大功率约束），制定优化问题以最大化可实现的速率。尽管这个问题是非凸的，通常很难解决，但我们提出了一种有效的算法，通过使用近似和块坐标下降（BCD）方法来获得其次优解。此外，我们还表明，所考虑的双主动 IRS 辅助系统仅实现了线性容量缩放顺序，而当总有源元件数量不太大时，它可以比具有单个主动 IRS、单个被动 IRS 或两个被动 IRS 的基准系统实现优异的速率性能。
In this letter, we consider the downlink communication for a wireless communication system aided by two active intelligent reflecting surfaces (IRSs), where a multi-antenna base station (BS) serves a single-antenna user via a double-reflection link only. An optimization problem is formulated to maximize the achievable rate by jointly designing the BS beamforming as well as the elements allocation, amplification-power allocation, and placement of the two active IRSs, subject to a total amplification power constraint. Although this problem is non-convex which is generally difficult to solve, we propose an efficient algorithm to obtain its suboptimal solution by using the approximation and block coordinate descent (BCD) methods. Moreover, we show that the considered double-active-IRS aided system attains a linear capacity scaling order only, while it can achieve superior rate performance over the benchmark systems with a single active IRS, a single passive IRS, or two passive IRSs when the number of total active elements is not too large.