基于空间相关性的信道反馈方案

摘要

下一代通信系统的重要技术之一是大规模MIMO(Massive MIMO)技术.该技术信道容量大、信道可靠性高、绿色低碳,但大规模多天线技术在MIMO系统中的应用大大提升了信道反馈,使系统性能下降.所以,研究大规模MIMO系统下信道状态反馈问题具有重大意义和价值.大规模天线阵列技术应用于MIMO系统且天线排列紧凑,使得信道的空间相关性得以体现,促使压缩感知技术可以被应用在这样的场景下进行信道信息的反馈.鉴于此,重点探究该方案的具体操作步骤,并完成了这个方案详细的原理解析和对应的模拟试验.%Massive MIMO (multiple input multiple output)technology, as the key technology of the next-generation wireless communication,can improve the capacity and robustness of wireless communication system. However, with the increase of the number of antennas in massive MIMO system, the amount of feedback increases dramatically. Additionally, the feedback channel apacity is limited, so it faces great challenges in feedback of the channel state information to transmitter. Therefore,the exploration on of channel feedback technology of Massive MIMO system is of great significance. The large number of antennas arranged in massive MIMO would lead to strong spatial correlation of between antennas. Thus, by taking advantage of this property, the feedback information can be compressed by using compressive sensing method. This paper discusses the concrete implementation method of this scheme, and gives detailed theoretical analysis and simulation evaluation.