多RIS辅助车载通信信号优化及部署规划  

Optimization and deployment planning of multi RIS assisted invehicle communication signals

作　　者：陈发堂[1] 王嘉程 刘祚 Chen Fatang;Wang Jiacheng;Liu Zuo(School of Communications&Information Engineering,Chongqing University of Posts&Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《计算机应用研究》2024年第10期3129-3134,共6页Application Research of Computers

基　　金：重庆市自然科学基金创新发展联合基金资助项目(中国星网)资助项目(CST2023NSCQ-LZX0114)。

摘　　要：针对匀变速运动的汽车产生的多普勒扩展和时延扩展以及接收信噪比的问题,提出了一种多智能超表面(RIS)辅助匀变速移动物体通信的方案。与传统信道估计不同的是,使用了信道增益的方法和优化RIS相位以及多目标优化来让移动物体能达到最大接收瞬时信噪比的同时,获得小的多普勒扩展和时延扩展。通过优化后的RIS相位来研究RIS的位置对接收信号的影响,分别研究了RIS之间的距离以及RIS之间距离一定时,RIS摆放在什么位置使得接收信号的信噪比以及时延扩展保持较低的范围,对于这个问题提出了相对运动的理论,且各自提出一种算法解决这两个问题。仿真表明,多RIS辅助的通信系统对车载通信接收信号的功率提升了约10 dB。RIS的部署位置应该让第一个RIS靠近基站并且RIS之间的距离在现实允许的情况下尽可能靠近。由此多RIS的通信方案可以广泛应用于车载通信中。This paper proposed a scheme to assist communication for vehicles undergoing uniform motion with variable speed,addressing issues such as Doppler spread,time delay spread,and received signal-to-noise ratio(SNR)through the utilization of a multi-intelligent RIS.Unlike traditional channel estimation,this scheme utilized channel gains and optimized RIS phase to minimize Doppler and delay spreads while maximizing instantaneous signal-to-noise ratio(SNR)for the moving object.The scheme studied the impact of RIS placement on the received signal by optimizing the RIS phase,exploring the distance between RIS units and the optimal positioning of RIS units when the distance between them was fixed to maintain a low range of reception SNR and delay spreading.It introduced relative motion theory for this problem and proposed respective algorithms to address both issues.Simulations show around a 10 dB power gain for vehicular communication receivers with multiple RIS assistance.Optimal RIS deployment suggests placing the first RIS near the base station and minimizing inter-RIS distances as much as practically feasible,showcasing the broad applicability of this multi-RIS communication approach in vehicular scenarios.

关 键 词：匀变速运动 多普勒扩展 时延扩展 接收信噪比 智能超表面 

分 类 号：TN929.5[电子电信—通信与信息系统]