2020 年 4 月 Journal on Communications April 2020
第 41 卷第 4 期 通 信 学 报 Vo l .41
No.4
大规模 MIMO 系统中基于谱分离的导频去污染
王海荣
1
,董健
2
,王玉辉
3
(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)
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。
关键词:大规模多输入多输出;导频污染;信道估计;谱分离
中图分类号:TN911.22
文献标识码:A
doi: 10.11959/j.issn.1000−436x.2020073
Pilot decontamination based on spectrum
separation in massive MIMO system
WANG Hairong
1
, DONG Jian
2
, WANG Yuhui
3
1. College of Telecommunications & Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
2. China Information Consulting & Designing Institute Co., Ltd., Nanjing 210019, China
3. Nanjing Marine Radar Institute, Nanjing 211100, China
Abstract: 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 me-
thod was proposed, which points out that different system parameters have different effects on the exact spectrum separa-
tion 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 in-
terference, 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.
Key words: massive MIMO, pilot contamination, channel estimation, spectrum separation
1 引言
随着经济全球化及互联网技术与移动通信技
术之间的不断融合发展,未来将会是移动互联网的
时代。在接下来的 10 年中,数据传输速率将达到
10 Gbit/s,无线数据流量将面临 1 000 倍的增长
[1]
,
收稿日期:2019−09−24;修回日期:2020−02−24
基金项目: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)
Foundation Items: The National Natural Science Foundation of China (No.61671251, No.61404130218), The Open Research Fun
of National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology(No.KFJJ20170304), The
Project of Nanjing University of Posts and Telecommunications (No.NY218009)