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

Claim 29:
30. A processing system 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 of a remote transceiver, comprising:
a communication interface;
at least one processor; and
memory comprising instructions executable by the at least one processor whereby the processing system is operable to:
obtain, from the transceiver via the communication interface, 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 the 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;
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 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;
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
provide, via the communication interface, the gain and phase calibration values to the transceiver.