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Proposed Massive‐MIMO Antenna Calibration Method Using Near‐Field Measurement
Author(s) -
Kawamura Takashi,
Fuse Masaaki
Publication year - 2021
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.23286
Subject(s) - antenna (radio) , antenna array , base station , electronic engineering , phase shift module , calibration , mimo , computer science , 3g mimo , engineering , electrical engineering , telecommunications , beamforming , physics , insertion loss , quantum mechanics
Fifth‐generation mobile communications systems now being developed use antennas with large numbers of antenna elements and are decided to be massive‐MIMO technologies for flexibly changing the antenna beam (beam forming). Obtaining the required directivity for a multielement antenna requires control of the phase and amplitude of the variable phase shifter and variable amplifier built into each antenna element. Moreover, the variable phase shifter and variable gain amplifier settings must be obtained so that every antenna element radiates equiamplitude and equiphase radio waves. This process is called antenna calibration. This paper proposes a method using near‐field measurement and back‐projection processing to perform calibration. Moreover, actual calibration tests of a simulated massive‐MIMO base station were executed using the proposed method. The results reported here confirm that calibration can be implemented using the proposed method even when the phase shifter of the simulated base station suffers large variability. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.