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

Claim 10:
11. A transceiver enabled to perform self-calibration for a plurality of transmit, Tx, antenna elements and a plurality of receive, Rx, antenna elements in an antenna array, comprising:
the antenna array comprising the plurality of Tx antenna elements and the plurality of Rx antenna elements;
gain and phase adjustment circuitry;
one or more transmitters and one or more receivers coupled to the plurality of Tx antenna elements and the plurality of Rx antenna elements; and
a baseband processing system adapted to:
perform gain measurements, GMTxiRxj, and phase measurements, ϕMTxiRxj, for a first selected pair of Tx antenna elements and two or more pairs of Rx antenna elements each pair of Rx antenna elements having symmetrical coupling properties with the first selected pair of Tx antenna elements, where the 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, where the receiver is coupled to a j-th Rx antenna element duringt he reception of a signal tranmitted by a transmitter coupled to an i-th Tx antenna element;

compute at least one relative gain value and at least one relative phase value for the first selected pair of Tx antenna elements;
repeat the performing 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;
normalize the at least one relative gain value and the at least one relative phase value relative to a defined reference Tx antenna element to thereby provide gain and phase calibration values for the plurality of Tx antenna elements; and
apply the gain and phase calibration values at the transceiver via the gain and phase adjustment circuitry.