Communication system, apparatus and methods for calibrating an antenna array

Abstract

A method for calibrating () an antenna array comprises a plurality of antenna elements coupled to a plurality of respective receive paths in a wireless communication system. The method comprises, in receive mode, applying a test signal to an individual single receive path () of the plurality of receive paths; and feeding back the test signal via a switched coupler network. The method further comprises running a receive calibration measurement routine to determine at least one measurement value used to calibrate the individual signal receive path and waiting for at least one converged measurement value; and extracting () the converged measurement value for at least one individual receive path. The steps of applying, running, extracting for a next individual single receive path are repeated until the calibration routine has completed (). The method further comprises selecting a converged measurement value of at least one individual receive path from a plurality of receive paths () to form a reference receiver calibration result (); normalizing a plurality of at least one measurement values of the plurality of receive paths using the reference receiver calibration result (); and applying a normalized value to at least one of the plurality of receive paths.