Reciprocity calibration methods for massive MIMO based on antenna coupling

Author

Vieira, Joao ; Rusek, Fredrik ; Tufvesson, Fredrik

Author_Institution

Dept. of Electr. & Inf. Technol., Lund Univ., Lund, Sweden

fYear

2014

fDate

8-12 Dec. 2014

Firstpage

3708

Lastpage

3712

Abstract

In this paper we consider time-division-duplex (TDD) reciprocity calibration of a massive MIMO system. The calibration of a massive MIMO system can be done entirely at the base station (BS) side by sounding the BS antennas one-by-one while receiving with the other BS antennas. With an M antenna BS, this generates M(M - 1) signals that can be used for calibration purposes. In this paper we study several least-squares (LS) based estimators, differing in the number of received signals that are being used. We compare the performance of the estimators, and we conclude that is possible to accurately calibrate an entire BS antenna array using the mutual coupling between antennas as the main propagation mechanism.

Keywords

MIMO communication; antenna arrays; electromagnetic coupling; electromagnetic wave propagation; least squares approximations; receiving antennas; BS antenna array; BS antenna coupling; LS based estimators; TDD reciprocity calibration method; antenna coupling; base station; least-squares based estimator; massive MIMO system; propagation mechanism; Antenna arrays; Antenna measurements; Calibration; Downlink; MIMO; Receiving antennas; Massive MIMO; TDD reciprocity; antenna calibration; downlink; estimation; uplink;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Communications Conference (GLOBECOM), 2014 IEEE

Conference_Location

Austin, TX

Type

conf

DOI

10.1109/GLOCOM.2014.7037384

Filename

7037384