Calibrating a testing device that tests base stations with massive MIMO antenna systems

A method, comprising:

• receiving, by a testing device and via a receiving port of a radio frequency (RF) frontend of the testing device, a downlink pilot signal;
• determining, by the testing device, a downlink channel associated with the downlink pilot signal and a phase associated with the downlink pilot signal;
• transmitting, by the testing device and via a transmitting port of the RF frontend of the testing device, an uplink pilot signal on an uplink channel that is reciprocal to the downlink channel;
• receiving, by the testing device and after transmitting the uplink pilot signal on the uplink channel, the uplink pilot signal via the receiving port of the RF frontend of the testing device;
• determining, by the testing device and after receiving the uplink pilot signal, a phase associated with the uplink pilot signal;
• determining, by the testing device, a phase difference between the phase associated with the downlink pilot signal and the phase associated with the uplink pilot signal;
• determining, by the testing device, that the phase difference satisfies a threshold;
• adjusting, by the testing device and based on the phase difference satisfying the threshold, one or more transmission settings of the testing device;
• and
• transmitting, by the testing device and based on the adjusted one or more transmission settings, one or more additional uplink pilot signals on the uplink channel via the transmitting port of the RF frontend of the testing device.

A non-transitory computer-readable medium storing instructions, the instructions comprising:

• one or more instructions that, when executed by one or more processors of a testing device, cause the one or more processors to:
• receive, via a receiving port of a radio frequency (RF) frontend of the testing device, a downlink pilot signal transmitted by an RF frontend of a base station;
• determine a phase associated with the downlink pilot signal;
• transmit, via a transmitting port of the RF frontend of the testing device and based on one or more transmission settings of the testing device, an uplink pilot signal to the base station;
• receive, after transmitting the uplink pilot signal, the uplink pilot signal via the receiving port of the RF frontend of the testing device;
• determine, by the testing device and after receiving the uplink pilot signal, a phase associated with the uplink pilot signal;
• and
• selectively adjust, based on the phase associated with the downlink pilot signal and the phase associated with the uplink pilot signal, the one or more transmission settings of the testing device.