Occupancy detection and range estimation using Wi-Fi radar

A method of wireless communication at a user equipment (UE), comprising:

• receiving a set of signals over a time period, wherein each signal in the set of signals includes a superposition of multipath signals traversed by the signal and a leakage signal;
• computing a first channel impulse response (CIR) for each signal in the set of signals;
• computing a second CIR for each signal in the set of signals based on setting channel taps that are not associated with the leakage signal in the first CIR to zeros;
• convolving the second CIR with a reference signal to obtain a temporary signal;
• removing the temporary signal from each signal to obtain the multipath signals for each signal;
• detecting, based on the multipath signals for each signal in the set of signals, whether there is a variance across the set of signals over the time period;
• and
• identifying a presence of at least one moving object in response to the detection of the variance.

An apparatus for wireless communication at a user equipment (UE), comprising:

• means for receiving a set of signals over a time period, wherein each signal in the set of signals includes a superposition of multipath signals traversed by the signal and a leakage signal;
• means for computing a first channel impulse response (CIR) for each signal in the set of signals;
• means for computing a second CIR for each signal in the set of signals based on setting channel taps that are not associated with the leakage signal in the first CIR to zeros;
• means for convolving the second CIR with a reference signal to obtain a temporary signal;
• means for removing the temporary signal from each signal to obtain the multipath signals for each signal;
• means for detecting, based on the multipath signals for each signal in the set of signals, whether there is a variance across the set of signals over the time period;
• and
• means for identifying a presence of at least one moving object in response to the detection of the variance.

A non-transitory computer-readable medium storing computer executable code, the code when executed by at least one processor causes the at least one processor to:

• receive a set of signals over a time period, wherein each signal in the set of signals includes a superposition of multipath signals traversed by the signal and a leakage signal;
• compute a first channel impulse response (CIR) for each signal in the set of signals;
• compute a second CIR for each signal in the set of signals based on setting channel taps that are not associated with the leakage signal in the first CIR to zeros;
• convolve the second CIR with a reference signal to obtain a temporary signal;
• remove the temporary signal from each signal to obtain the multipath signals for each signal in the set of signals;
• detect, based on the multipath signals for each signal in the set of signals, whether there is a variance across the set of signals over the time period;
• and
• identify a presence of at least one moving object in response to the detection of the variance.