Mobile-assisted phase calibration method and system

A method of calibrating phase alignment of signals from multiple transmit antennas on multiple channels during over-the-air (OTA) testing of a multiple-input multiple-output (MIMO) device under test, (DUT), including:

• generating a noisy test signal by adding noise to a signal pattern and transmitting the noisy test signal to the DUT on first and second channels OTA;
• sweeping a relative phase of the signal pattern, but not the added noise, in the first and second channels, while receiving from the DUT reports of a reference signal received power (RSRP) or a received signal strength indicator (RSSI), collectively signal measurement, for a received signal on at least one of the first and second channels;
• analyzing variation in the signal measurement to determine phase alignment of the first and second channels, as received and processed by the DUT;
• and
• using the determined phase alignment to perform OTA testing of the DUT.

A tangible non-transitory computer readable storage media, loaded with program instructions that, when executed on processors, cause the processors to implement a method of calibrating phase alignment of signals from multiple transmit antennas on multiple channels during over-the-air (OTA) testing of a multiple-input multiple-output (MIMO) device under test (DUT), the method including:

• generating a noisy test signal by adding noise to a signal pattern and transmitting the noisy test signal to the DUT on first and second channels OTA;
• sweeping a relative phase of the signal pattern, but not the added noise, in the first and second channels, while receiving from the DUT reports of a signal-to-noise ratio (SNR) for a received signal on at least one of the first channel and subsequently on the second channel;
• analyzing variation in the SNR to determine phase alignment of the first and second channels, as received and processed by the DUT;
• and
• using the determined phase alignment to perform OTA testing of the DUT.

A tangible non-transitory computer readable storage media, loaded with program instructions that, when executed on processors, cause the processors to implement a method of calibrating phase alignment of signals from multiple transmit antennas on multiple channels during over-the-air (OTA) testing of a multiple-input multiple-output (MIMO) device under test (DUT), the method including:

• generating a noisy test signal by adding noise to a signal pattern and transmitting the noisy test signal to the DUT on first and second channels OTA;
• sweeping a relative phase of the signal pattern, but not the added noise, in the first and second channels, while receiving from the DUT reports of a reference signal received power (RSRP) or a received signal strength indicator (RSSI), collectively signal measurement, for a received signal on at least one of the first and second channels;
• analyzing variation in the signal measurement to determine phase alignment of the first and second channels, as received and processed by the DUT;
• and
• using the determined phase alignment to perform OTA testing of the DUT.