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

1. A method, comprising:

determining, by a testing device, a phase associated with a downlink pilot signal received via a receiving port of a radio frequency (RF) frontend of the testing device;

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;

receiving, by the testing device and based on transmitting the uplink pilot signal, the uplink pilot signal at the receiving port of the RF frontend of the testing device;

determining, by the testing device, a phase difference between the phase associated with the downlink pilot signal and a phase associated with the uplink pilot signal; and

adjusting, by the testing device and based on the phase difference, one or more transmission settings of the testing device.

2. The method of claim 1 , wherein the uplink pilot signal is generated based on processing the downlink pilot signal using a phase-locked loop.

3. The method of claim 1 , wherein determining the phase difference comprises:

subtracting the phase associated with the downlink pilot signal from the phase associated with the uplink pilot signal.

4. The method of claim 1 , further comprising:

determining a phase change based on the phase difference; and

wherein adjusting the one or more transmission settings is based on the phase change.

5. The method of claim 1 , wherein adjusting the one or more transmission settings is based on determining that the downlink pilot signal and the uplink pilot signal are not aligned.

6. The method of claim 1 , wherein the one or more transmission settings control how the uplink pilot signal is transmitted.

7. The method of claim 1 , wherein the one or more transmission settings are associated with one or more of:

a loop filter,

a voltage controlled oscillator,

a phase comparator, or

a phase-locked loop.

8. A testing device, comprising:

one or more memories; and

one or more processors, coupled to the one or more memories, configured to:

determine a phase associated with a downlink pilot signal received via a receiving port of a radio frequency (RF) frontend of the testing device;

transmit, via a transmitting port of the RF frontend of the testing device, an uplink pilot signal on an uplink channel;

receive, based on transmitting the uplink pilot signal, the uplink pilot signal at the receiving port of the RF frontend of the testing device;

determine a phase difference between the phase associated with the downlink pilot signal and a phase associated with the uplink pilot signal; and

adjust, based on the phase difference, one or more transmission settings of the testing device.

9. The testing device of claim 8 , wherein the uplink pilot signal is generated based on processing the downlink pilot signal using a phase-locked loop.

10. The testing device of claim 8 , wherein the one or more processors, when determining the phase difference, are configured to:

subtract the phase associated with the downlink pilot signal from the phase associated with the uplink pilot signal.

11. The testing device of claim 8 , wherein the one or more processors are further configured to:

determine a phase change based on the phase difference; and

wherein adjusting the one or more transmission settings is based on the phase change.

12. The testing device of claim 8 , wherein adjusting the one or more transmission settings is based on determining that the downlink pilot signal and the uplink pilot signal are not aligned.

13. The testing device of claim 8 , wherein the one or more transmission settings control how the uplink pilot signal is transmitted.

14. The testing device of claim 8 , wherein the one or more transmission settings are associated with one or more of:

a loop filter,

a voltage controlled oscillator,

a phase comparator, or

a phase-locked loop.

15. A non-transitory computer-readable medium storing a set of instructions, the set of instructions comprising:

one or more instructions that, when executed by one or more processors of a testing device, cause the testing device to:

determine a phase associated with a downlink pilot signal received via a receiving port of a radio frequency (RF) frontend of the testing device;

transmit, via a transmitting port of the RF frontend of the testing device, an uplink pilot signal on an uplink channel;

receive, based on transmitting the uplink pilot signal, the uplink pilot signal at the receiving port of the RF frontend of the testing device;

determine a phase difference between the phase associated with the downlink pilot signal and a phase associated with the uplink pilot signal; and

adjust, based on the phase difference, one or more transmission settings of the testing device.

16. The non-transitory computer-readable medium of claim 15 , wherein the uplink pilot signal is generated based on processing the downlink pilot signal using a phase-locked loop.

17. The non-transitory computer-readable medium of claim 15 , wherein the one or more instructions, that cause the testing device to determine the phase difference, cause the testing device to:

subtract the phase associated with the downlink pilot signal from the phase associated with the uplink pilot signal.

18. The non-transitory computer-readable medium of claim 15 , wherein adjusting the one or more transmission settings is based on determining that the downlink pilot signal and the uplink pilot signal are not aligned.

19. The non-transitory computer-readable medium of claim 15 , wherein the one or more transmission settings control how the uplink pilot signal is transmitted.

20. The non-transitory computer-readable medium of claim 15 , wherein the one or more transmission settings are associated with one or more of:

a loop filter,

a voltage controlled oscillator,

a phase comparator, or

a phase-locked loop.