The Downlink Performance of Massive MIMO Systems under Different Uplink Pilot Allocation Schemes

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Huang, Ziju^1 ; Zhi, Hui^1 ; Wang, Feiyue^1

Key Lab of Computing Intelligent and Signal Processing (Ministry of Education), Anhui University, Hefei, China^1

关键词: Downlink performance;    Downlink signals;    Downlink transmissions;    Massive multiple-input- multiple-output system (MIMO);    Pilot contaminations;    Spectral efficiencies;    Spectrum efficiency;    Time division duplexing;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/7/072018/pdf
DOI  :  10.1088/1757-899X/490/7/072018

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In the scenario of time division duplexing (TDD) massive multiple-input multiple-output (MIMO) system, when there is pilot contamination (PC) in the uplink, different pilot allocation schemes will affect the results of the uplink channel estimation. When the channel estimation results are used for downlink transmission precoding, which will further affects the downlink performance. This paper analyses the impact of different pilot allocation (PA) schemes on downlink performance. Through theoretical analysis, the system downlink signal to interference plus noise ratio (SINR) and spectral efficiency expressions of different pilot allocation schemes are obtained respectively. The simulation results show that the pilot allocation schemes with cell grouping is better than the schemes without cell grouping. The SINR increases as the number of cell grouping increases, and the spectrum efficiency increases first and then decreases as the number of cell grouping increases.