大规模MIMO系统中基于谱分离的导频去污染  

Pilot decontamination based on spectrum separation in massive MIMO system

作　　者：王海荣[1] 董健 王玉辉[3] WANG Hairong;DONG Jian;WANG Yuhui(College of Telecommunications&Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;China Information Consulting&Designing Institute Co.,Ltd.,Nanjing 210019,China;Nanjing Marine Radar Institute,Nanjing 211100,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]中通服咨询设计研究院有限公司,江苏南京210019 [3]南京船舶雷达研究所,江苏南京211100

出　　处：《通信学报》2020年第4期197-205,共9页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61671251,No.61404130218);射频集成与微组装技术国家地方联合工程实验室开放基金资助项目(No.KFJJ20170304);南京邮电大学科研基金资助项目(No.NY218009)。

摘　　要：为了克服大规模MIMO的技术瓶颈--上行链路导频污染,与现有盲导频去污染中系统参数同时设计的方法不同,提出了系统参数的分层设计方法,指出不同的系统参数对最终接收信号样本协方差矩阵谱精确分离的作用是不同的,即具有不同的优先级。然后,发现要实现谱分离,期望信号的功率并不一定要高于干扰功率,两者之间的差异才是决定因素。更进一步地,在导频序列长度小于基站接收天线数这种更实际的场景下,首次给出了一种数值算法同样能实现上述的精确谱分离。实验仿真证明,由于分层的参数设计保证了渐近谱的精确分离,所提方案比现有的盲导频去污染方案更适合实际应用。In order to overcome uplink pilot contamination,the technical bottleneck of massive MIMO,and different from the existing parallel parameter design strategy for blind pilot decontamination,a hierarchical parameter design method was proposed,which points out that different system parameters have different effects on the exact spectrum separation of the sample covariance matrix of the received signal.In other words,different parameters have different priority.Next,it was found that to achieve spectral separation,the power of the desired signal didn’t have to be higher than the interference,and the difference between the two was more important.Furthermore,in a more practical scenario where the pilot sequence length was less than the number of base station receiving antennas,a numerical algorithm was given for the first time to achieve the above-mentioned exact spectral separation.Since the hierarchical parament design ensures the exact separation of the asymptotic spectrum,the results show that the proposed scheme is more suitable for practical applications than the existing blind pilot decontamination.

关 键 词：大规模多输入多输出 导频污染 信道估计 谱分离 

分 类 号：TN911.22[电子电信—通信与信息系统]