摘要
LTE-A(Long Term Evolution-Advanced)系统有高速率、低时延的需求。但是,系统中的干扰严重影响了终端接收信号质量,限制了系统性能的提升。对于小区间的同频干扰,重点研究了干扰消除性能较优的IRC(Interference Rejection Combining)算法。针对目前IRC算法的两种经典的协方差矩阵估计方案—基于数据信号和基于DM-RS参考信号的协方差矩阵估计方案的优点与不足,给出了一种基于样本点选取的协方差矩阵估计的改进方案。仿真结果表明,改进后的IRC算法较基于DM-RS参考信号的协方差矩阵估计的IRC算法有1 d B^2 d B的性能增益,因此更适用于受同频干扰比较严重的LTE-A系统中。
Long Term Evolution-Advanced（LTE-A） system has the demands of high rate and low latency. However, interference in the system seriously affects the signal quality received by the terminal and limits the increasing of system performance. For inter- cell co-channel interference, Interference Rejection Combining（IRC） technology has better performance and is studied. There are two kinds of classical covariance matrix estimation schemes of IRC. One is based on data, and other is based on DM-RS references. Combining the advantages and disadvantages of these two programs, the method of selecting the sample points and computing co- variance matrix is improved. Simulation results show that the improved IRC algorithm has 1-2dB performance gain compared with the one based on DM-RS references. It＇s more suitable for LTE-A system affected by co-channel interference.
出处
《电子技术应用》
北大核心
2015年第12期79-82,共4页
Application of Electronic Technique
基金
新一代宽带无线移动通信网国家科技重大专项(2012ZX03001012)
