智能超表面辅助的OAM通信信道建模及容量分析
Capacity analysis and channel modeling of reconfigurable intelligent surface-assisted OAM communication systems
朱启标 1黎文文 1王剑涛 1罗斌1
作者信息
- 1. 南昌大学 信息工程学院,南昌 330031
- 折叠
摘要
现有智能超表面(reconfigurable intelligent surface,RIS)辅助的轨道角动量(orbital angular momentum,OAM)通信系统的相关研究大都采用自由空间传播信道,针对该信道无法准确描述OAM信号传播特性的问题,研究了OAM信号在自由空间场景下的传播特性.结合莱斯衰落信道建立了一种RIS辅助的OAM信道模型.RIS辅助的OAM通信系统采用RIS产生具有不同模态的OAM信号,通过联合优化算法优化功率分配系数和RIS无源波束成形来提高信道容量,分析了信噪比和传输功率等因素对信道容量的影响.仿真结果表明:所提出的衰落信道模型能够描述OAM信号在RIS辅助信道中的传播特性,实现更高的信道容量.
Abstract
Research on reconfigurable intelligent surface ( RIS ) assisted orbital angular momentum ( OAM ) communication systems mainly employs free-space propagation channels. However, the channel model fails to accurately describe the propagation characteristics of OAM signals. This paper studies the propagation characteristics of OAM signals in free-space scenarios. Based on our study, the RIS-assisted OAM channel model is built with Rice fading channel. The RIS-assisted OAM communication systems generates OAM signals with different modes by using RIS. Power allocation and RIS passive beam-forming are optimized by a joint optimization algorithm to improve the channel capacity, and the influence of signal-to-noise ratio ( SNR ) and transmission power on channel capacity is analyzed. Our simulation results show the proposed fading channel model describes the propagation character of OAM signals in RIS-assisted channels and achieves higher channel capacity.
关键词
智能超表面/轨道角动量/信道建模/容量分析Key words
reconfigurable intelligent surface/orbital angular momentum/channel modeling/capacity analysis引用本文复制引用
基金项目
国家自然科学基金项目(61961024)
国家自然科学基金项目(62261037)
江西省自然科学基金项目(20181BAB202001)
江西省研究生创新专项基金项目(YC2022-S124)
出版年
2024
国家科技期刊平台
NSTL
万方数据