Determining a propagation condition of a wireless channel

A method comprising:

• obtaining one or more packets that have been received over a wireless channel via a first antenna, wherein each packet comprises a plurality of time-frequency resources, each time-frequency resource corresponding to one of a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and one of a plurality of subcarriers in a frequency domain;
• obtaining raw data from the one or more packets, the raw data comprising a plurality of raw amplitude values and a plurality of raw phase values, each raw amplitude value and each raw phase value corresponding to a respective time-frequency resource;
• processing the raw data according to an interference mitigation process that yields a plurality of calibrated amplitude values and a plurality of calibrated phase values;
• using the plurality of calibrated amplitude values and the plurality of calibrated phase values to determine a plurality of weighted phase values, each weighted phase value corresponding to a respective subcarrier;
• determining a phase variance for the first antenna, the phase variance based on comparing the plurality of weighted phase values across the plurality of subcarriers;
• and
• determining whether the wireless channel experiences line-of-sight propagation or non-line-of-sight propagation based at least in part on the phase variance of the first antenna.

A non-transitory computer readable medium comprising logic that, when executed by processing circuitry of a network node, causes the network node to perform actions comprising:

• obtaining one or more packets that have been received over a wireless channel via a first antenna, wherein each packet comprises a plurality of time-frequency resources, each time-frequency resource corresponding to one of a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and one of a plurality of subcarriers in a frequency domain;
• obtaining raw data from the one or more packets, the raw data comprising a plurality of raw amplitude values and a plurality of raw phase values, each raw amplitude value and each raw phase value corresponding to a respective time-frequency resource;
• processing the raw data according to an interference mitigation process that yields a plurality of calibrated amplitude values and a plurality of calibrated phase values;
• using the plurality of calibrated amplitude values and the plurality of calibrated phase values to determine a plurality of weighted phase values, each weighted phase value corresponding to a respective subcarrier;
• determining a phase variance for the first antenna, the phase variance based on comparing the plurality of weighted phase values across the plurality of subcarriers;
• and
• determining whether the wireless channel experiences line-of-sight propagation or non-line-of-sight propagation based at least in part on the phase variance of the first antenna.