论文标题
固定光束成形，用于多个智能反射表面辅助MMWave系统
Secure Beamforming for Multiple Intelligent Reflecting Surfaces Aided mmWave Systems
论文作者
论文摘要
在这封信中，研究了在多个智能反射表面（IRSS）辅助毫米波（MMWAVE）系统中进行安全的光束。在此系统中，通过控制每个IRS的开关状态以及优化IRSS的相移矩阵，可以最大程度地提高保密率。该问题被视为发射光束成型和IRS控制的关节优化问题，其目标是在总传输功率和单位模式约束下最大化保密率。由于约束条件和耦合变量的非转化性，难以最佳解决问题。为了解决这个问题，我们提出了基于连续的凸近似（SCA）和歧管优化（MO）技术的基于连续的优化（AO）算法。数值模拟表明，所提出的基于AO的算法可以有效提高保密率，并胜过传统的单一IRS AID方案。
In this letter, secure beamforming in a multiple intelligent reflecting surfaces (IRSs)-aided millimeter-wave (mmWave) system is investigated. In this system, the secrecy rate is maximized by controlling the on-off status of each IRS as well as optimizing the phase shift matrix of the IRSs. This problem is posed as a joint optimization problem of transmit beamforming and IRS control, whose goal is to maximize the secrecy rate under the total transmission power and unit-modulus constraints. The problem is difficult to solve optimally due to the nonconvexity of constraint conditions and coupled variables. To deal with this problem, we propose an alternating optimization (AO)-based algorithm based on successive convex approximation (SCA) and manifold optimization (MO) technologies. Numerical simulations show that the proposed AO-based algorithm can effectively improve the secrecy rate and outperforms the traditional single IRS-aided scheme.
