Methods and wireless devices for estimating antenna calibration error in a wireless communication network

Abstract

Disclosed is a method performed by a receiver of a wireless communication network (), for estimating antenna calibration error in the receiver based on one or more Reference Signals, RS, sent by one or more transmitters of the wireless communication network. The receiver comprises a plurality of radio antennas arranged in a known geometrical configuration. The method comprises obtaining () channel data of a communication channel between the transmitter and the receiver based on the one or more RS sent wirelessly between the transmitter and the plurality of antennas of the receiver, the obtained () channel data comprising Hand H. Hbeing the channel data contributed by a wireless propagation path between the transmitter and the receiver, Hbeing the channel data contributed by the antenna calibration error of the receiver. The method further comprises determining () a direction between the transmitter and the receiver in relation to the known geometrical configuration arrangement of the plurality of radio antennas, based on the obtained () channel data, the determined () direction indicating the H. The method further comprises mitigating () the Hfrom the obtained () channel data based on the determined () direction. The method further comprises providing () the Hpart of the obtained () channel data after the Hbeing mitigated (), the Hindicating the antenna calibration error in the form of channel data.