Patent ID: 11942694
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. A method of operation of a processing system to provide self-calibration for a plurality of transmit, Tx, antenna elements and a plurality of receive, Rx, antenna elements in an antenna array of a remote transceiver, comprising:
obtaining, from the transceiver, gain measurements, GMTxiRxj and phase measurements, ϕMTxiRxj, for pairs of Tx antenna elements and two or more pairs of Rx antenna elements each pairs of Rx antenna elements have symmetrical coupling properties with the first selected pair of Tx antenna elements, where gain measurement GMTxiRxj and phase measurement ϕMTxiRxj are measured gain and phase at an output of a receiver compared to an input of a transmitter, when the receiver is coupled to a j-th Rx antenna element during reception of a signal transmitted by the transmitter coupled to an i-th Tx antenna element;
computing at least one relative gain value and at least one relative phase value for the first selected pair of Tx antenna elements;
repeating the obtaining and computing steps for a second selected pair of Tx antenna elements and two or more pairs of Rx antenna elements, each pair of Rx antenna elements also having symmetrical coupling properties with the second selected pair of Tx antenna elements;
normalizing the relative gain values and the relative phase values relative to a defined reference Tx antenna element to thereby provide gain and phase calibration values for the plurality of Tx antenna elements; and
providing the gain and phase calibration values to the remote transceiver.