A pilot allocation method for multi-cell multi-user massive MIMO system

• 来源期刊: 系统工程与电子技术（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ELECTRONICS TECHNOLOGY
• 页码范围: 399-407
• 页数: 9页
• 语种: 英文
• DOI: 10.23919/JSEE.2021.000033

摘要

Pilot contamination can spoil the accuracy of channel estimation and then has become one of the key problems influ-encing the performance of massive multiple input multiple out-put (MIMO) systems. This paper proposes a method based on cell classification and users grouping to mitigate the pilot con-tamination in multi-cell massive MIMO systems and improve the spectral efficiency. The pilots of the terminals are allocated one-bit orthogonal identifier to diminish the cell categories by the ope-ration of exclusive OR (XOR). At the same time, the users are di-vided into edge user groups and central user groups according to the large-scale fading coefficients by the clustering algorithm, and different pilot sequences are assigned to different groups. The simulation results show that the proposed method can ef-fectively improve the spectral efficiency of multi-cell massive MIMO systems.