Journal of Systems Engineering and Electronics ›› 2021, Vol. 32 ›› Issue (2): 399-407.doi: 10.23919/JSEE.2021.000033

• ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

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

Yiming LI1(), Liping DU1,2,*(), Yueyun CHEN1()   

  1. 1 School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2 Wireless and Space Communication Laboratory, Shunde Graduate School of University of Science and Technology Beijing, Foshan 528000, China
  • Received:2020-02-13 Online:2021-04-29 Published:2021-04-29
  • Contact: Liping DU E-mail:liyiming95111@126.com;Dlp2001@ies.ustb.edu.cn;chenyy@ustb.edu.cn
  • About author:|LI Yiming was born in 1995. He is currently pursuing his master’s degree in the information and communication engineering from the School of Computer and Communication Engineering, University of Science and Technology Beijing (USTB). His research interest is wireless communication. E-mail: liyiming95111@126.com||DU Liping was born in 1975. She is a professor in the School of Computer and Communication Engineering, University of Science and Technology Beijing (USTB) and Shunde Graduate School of USTB. Her research interests are wireless communication, signal processing and pattern recognition. E-mail: Dlp2001@ies.ustb.edu.cn||CHEN Yueyun was born in 1966. She is a professor in the School of Computer and Communication Engineering, University of Science and Technology Beijing (USTB). She is an IEEE member. Her research interests are wireless mobile communication system theory, broadband wireless communication technology and wireless resource management. E-mail: chenyy@ustb.edu.cn
  • Supported by:
    This work was supported by the Scientific and Technological Innovation Foundation of Shunde Graduate School, USTB (BK19CF002);This work was supported by the Scientific and Technological Innovation Foundation of Shunde Graduate School, USTB (BK19CF002)

Abstract:

Pilot contamination can spoil the accuracy of channel estimation and then has become one of the key problems influencing the performance of massive multiple input multiple output (MIMO) systems. This paper proposes a method based on cell classification and users grouping to mitigate the pilot contamination 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 operation of exclusive OR (XOR). At the same time, the users are divided 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 effectively improve the spectral efficiency of multi-cell massive MIMO systems.

Key words: massive multiple input multiple output (MIMO), pilot allocation, cell classification, users grouping (UG), spectral efficiency