论文标题
关于IRS辅助Mimome窃听通道的能源效率最大化
On the Energy-Efficiency Maximization for IRS-Assisted MIMOME Wiretap Channels
论文作者
论文摘要
安全性和能源效率已成为现代无线通信的关键特征。在本文中，我们考虑了用于智能反射表面（IRS）的多输入多输出多输出多型毛动器（Mimome）窃听通道（WTC）的节能设计。我们的目标是共同优化发射协方差矩阵和IRS相移，以最大程度地提高所考虑系统的保密能效率（请参阅），但要受到合法接收器的保密率约束。为了解决这个具有挑战性的非凸面问题，在目标和约束中耦合设计变量，我们提出了基于双重分解的交替梯度投影（PDDAPG）方法，以获得有效的解决方案。我们还表明，所提出的算法的计算复杂性仅随着IRS的反射元素的数量以及发射机/接收器节点上的天线数量而线性增长。我们的结果证实，与其NO-IRS相比，仅当IRS的功耗很小时，使用IRS有助于改善Mimome WTC的观察。特别是，大型IRS并不总是有益于Mimome WTC的看到。
Security and energy efficiency have become crucial features in the modern-era wireless communication. In this paper, we consider an energy-efficient design for intelligent reflecting surface (IRS)-assisted multiple-input multiple-output multiple-eavesdropper (MIMOME) wiretap channels (WTC). Our objective is to jointly optimize the transmit covariance matrix and the IRS phase-shifts to maximize the secrecy energy efficiency (SEE) of the considered system subject to a secrecy rate constraint at the legitimate receiver. To tackle this challenging non-convex problem in which the design variables are coupled in the objective and the constraint, we propose a penalty dual decomposition based alternating gradient projection (PDDAPG) method to obtain an efficient solution. We also show that the computational complexity of the proposed algorithm grows only linearly with the number of reflecting elements at the IRS, as well as with the number of antennas at transmitter/receivers' nodes. Our results confirm that using an IRS is helpful to improve the SEE of MIMOME WTC compared to its no-IRS counterpart only when the power consumption at IRS is small. In particular, and a large-sized IRS is not always beneficial for the SEE of a MIMOME WTC.
