基于主动与被动波束赋形联合优化的智能反射面增强无线网络
信息论
2019-08-13 v4 math.IT
最优化与控制
摘要
智能反射面(IRS)被设想为一种崭新且具有革命性的技术,可在未来以低成本实现频谱与能量高效的无线通信网络。具体而言,IRS由大量低成本无源单元组成,每个单元以特定相移反射入射信号,从而在指定接收端协同实现波束赋形和/或干扰抑制。本文研究了一种IRS辅助的多用户多输入单输出(MISO)无线系统,其中部署一个IRS来辅助多天线接入点(AP)到多个单天线用户的通信。因此,每个用户通过反射接收到来自AP以及IRS的叠加信号。我们的目标是在满足各用户信号干扰加噪声比(SINR)约束的前提下,通过联合优化AP处有源天线阵列的发射波束赋形与IRS处无源相移器的反射波束赋形,最小化AP的总发射功率。然而,所构建的问题是非凸的,难以求得最优解。
引用
@article{arxiv.1810.03961,
title = {Intelligent Reflecting Surface Enhanced Wireless Network via Joint Active and Passive Beamforming},
author = {Qingqing Wu and Rui Zhang},
journal= {arXiv preprint arXiv:1810.03961},
year = {2019}
}
备注
Accepted by (to appear in) Transactions on Wireless Communications. Without compromising QoS, we can scale down the transmit power by 1/N^2 (quadratically). This is fundamentally due to the "reflecting" rather than "transmit" principle in the new type of hardware proposed in the paper.More papers in IRS at https://elewuqq.wixsite.com/mysite