LTE-A下行MIMO技术新特性及测试方法研究

Study on Now Features and Test Methods of Dounlcad MIMO Technologies in LTE-A

为满足ITU对下一代移动通信系统频谱效率的更高要求,3GPP在LTE-A系统中引入了增强型下行MIMO技术,通过将下行4天线扩展为8天线,为系统引入了更高的分集增益和复用增益,提高了网络吞吐量和频谱效率。本文对LTE-A中增强型下行MIMO技术进行分析,通过将LTE-A与LTE下行MIMO传输方式进行对比,重点对LTE-A下行MIMO中的解调参考信号,信道测量参考信号,TM9传输模式和8天线码本等新特性进行介绍,并针对下行MIMO的新特性设计了测试方法。

Aiming to achieve the ITU requirement ofnext generation mobile system in spectrum efficiency, 3GPP exploits the enhanced downlink MIMO technology which extends antenna number from 4 to 8 to improve the network throughput and spectrum efficiency by introducing higher diversity and multiplexing gain. This paper analyzes the key feature of enhanced downlink MIMO in LTE-A by compared with downlink MIMO in LTE. After presenting the detail content of new features such as DM-RS,CSI-RS,TM9 transmission mode and 8 antenna codebook, the paper also designs specific test cases for functional verification.