Beamforming calibration

A non-transitory computer readable medium, having thereon a computer program comprising program instructions, the computer program being loadable into a data processing unit and configured to cause execution of a method when the computer program is run by the data processing unit, wherein the method is for beamforming calibration for a multi-antenna transceiver configured to communicate with one or more other transceivers, the multi-antenna transceiver having a plurality of transceiver chains connectable to respective antenna elements of the multi-antenna transceiver, and each transceiver chain comprising a transmitter path and a receiver path, the method comprising, for each transceiver chain:

• feeding an analog signal from the transmitter path to the receiver path via connection circuitry between the transmitter path and the receiver path to provide a digital calibration signal, wherein the digital calibration signal corresponds to an inversion of the analog signal being passed through the receiver path;
• and
• determining a beamforming calibration factor for the transceiver chain based on the digital calibration signal.