论文标题
基于CSI的统计设计，用于智能反射表面辅助误会系统
Statistical CSI based Design for Intelligent Reflecting Surface Assisted MISO Systems
论文作者
论文摘要
本文认为智能反射表面（IRS）辅助多输入单输出通信系统，其中利用统计通道状态信息（CSI）进行传输光束成型和IRS光束成形。对于系统的厄乳态能力，得出了一个紧密的上限。基于哪个，研究了发射光束和IRS光束的关节优化。根据访问点和用户之间是否存在视线路径，分别处理了两种不同的情况，即里奇亚人褪色和瑞利褪色。具体而言，对于里奇亚式褪色情况，提出了一种迭代算法，保证会收敛。对于雷利褪色案例，可以为发射束和IRS梁获得封闭形式的设计。仿真结果表明，所提出的波束形成方案的性能与需要瞬时CSI的基准算法相似。
This paper considers an intelligent reflecting surface (IRS) aided multiple-input single-output communication system, where statistical channel state information (CSI) is exploited for transmit beamforming and IRS beamforming. A tight upper bound is derived for the ergodic capacity of the system. Based on which, the joint optimization of transmit beam and IRS beam are studied. Depending on whether a line-of-sight path exists between the access point and user, two different cases, namely, Rician fading and Rayleigh fading, are separately treated. Specifically, for the Rician fading case, an iterative algorithm is proposed, which is guaranteed to converge. For the Rayleigh fading case, closed-form designs are obtained for the transmit beam and IRS beam. Simulation results show the proposed beamforming scheme achieves similar performance as the benchmark algorithm requiring instantaneous CSI.
