Calibration of a phase shift matrix for cable-connected testing of a massive multiple-input multiple-output base station

Abstract

A testing device may receive, from a phase shift matrix (PSM), a signal pattern associated with a plurality of antenna ports of a base station. The testing device may obtain data associated with the signal pattern and may identify, based on the data, a plurality of null directions associated with the signal pattern. The testing device may, for each null direction of the plurality of null directions: identify, based on the data, a measured amplitude associated with the null direction; determine, based on the measured amplitude, an estimated phase associated with the null direction; and determine, based on the measured amplitude and the estimated phase, an estimated in-phase amplitude associated with the null direction. The testing device may thereby determine error correction information associated with the plurality of null directions. The testing device may provide the error correction information, such as to enable calibration of the PSM.