低复杂度超大规模MIMO无线传输设计研究

Research on low-complexity XL-MIMO wireless transmission design

超大规模MIMO(extra-large scale MIMO,XL-MIMO)技术有望满足6G对高频谱效率的要求,同时也面临计算复杂度提升带来的挑战。研究发现,XL-MIMO信道独特的空间非平稳特性为低复杂度无线传输设计带来新的可能。首先从近场传播效应出发,梳理XL-MIMO信道特性及信道建模研究成果,深入探讨空间非平稳性出现的原因;由此引出XL-MIMO中阵列可见区域(visibility region,VR)的概念,并对结合VR信息的低复杂度无线传输设计展开讨论;接着,从子阵列划分与分布式信号处理的角度,介绍XL-MIMO低复杂度系统架构的实现,并总结相应的设计方案;最后,对未来研究方向进行展望。

Extra-large scale MIMO(XL-MIMO)can meet the requirement of high spectral efficiency in 6G commu-nication,but also faces the challenge caused by the increase in computational complexity.It is found that the unique spatial non-stationary characteristics of XL-MIMO channel brings new possibilities for low-complexity wireless transmission design.Firstly,starting from the near-field propagation effect,the research results of XL-MIMO channel characteristics analysis and channel modeling were combed,and the causes of spatial non-stationarity were deeply discussed.Furthermore,the concept of array visibility region(VR)in XL-MIMO was introduced,and the low-complexity wireless transmission design combined with VR information was discussed.Then,from the perspective of sub-array partition and distributed signal processing,the implementation of XL-MIMO low-complexity system architecture was introduced,and the corresponding design schemes were summarized.Finally,the future research direction was prospected.