论文标题
位置信息帮助多个智能反射表面系统
Location Information Aided Multiple Intelligent Reflecting Surface Systems
论文作者
论文摘要
本文提出了一个新的位置信息，帮助多个智能反射表面（IRS）系统。假设用户位置信息不完美，则估计了从IRS到用户的有效角度，然后将其用于设计发射光束和IRS梁。此外，得出了可实现速率的封闭式表达式。分析结果表明，可以通过增加基站（BS）天线或反射元素的数量来提高可实现的速率。具体而言，可以实现订单$ n m^2 $的功率增益，其中$ n $是天线编号，而$ m $是反射元素的数量。此外，有了大量的反射元素，单个信号与干扰噪声比（SINR）与$ m $成正比，而与$ m^2 $成正比，随着非线视线（NLOS）路径的消失。同样，已经表明，高位置不确定性将大大降低可实现的速度。此外，应将IRS部署在不同的方向（相对于BS），并彼此之间相距很远，以减少多个IRS的干扰。最后，已经提出了一种最佳功率分配方案来改善系统性能。
This paper proposes a novel location information aided multiple intelligent reflecting surface (IRS) systems. Assuming imperfect user location information, the effective angles from the IRS to the users are estimated, which is then used to design the transmit beam and IRS beam. Furthermore, closed-form expressions for the achievable rate are derived. The analytical findings indicate that the achievable rate can be improved by increasing the number of base station (BS) antennas or reflecting elements. Specifically, a power gain of order $N M^2$ is achieved, where $N$ is the antenna number and $M$ is the number of reflecting elements. Moreover, with a large number of reflecting elements, the individual signal to interference plus noise ratio (SINR) is proportional to $M$, while becomes proportional to $M^2$ as non-line-of-sight (NLOS) paths vanish. Also, it has been shown that high location uncertainty would significantly degrade the achievable rate. Besides, IRSs should be deployed at distinct directions (relative to the BS) and be far away from each other to reduce the interference from multiple IRSs. Finally, an optimal power allocation scheme has been proposed to improve the system performance.
