Motion detection using communication channel carrier signal

A system, comprising:

• a motion detection processor including a data processing apparatus and a non-transitory computer memory storing instructions executable by the data processing apparatus and that upon such execution cause the data processing apparatus to perform operations comprising:
• for each of one or more communication channels, wherein each communication channel has a center frequency that is different from the center frequency of each other communication channel:
• determining mean power levels from consecutive power samples at the center frequency;
• determining a difference between the mean power levels of two consecutive power samples at the center frequency;
• and
• determining whether physical motion is occurring in a monitored area based on the difference between the mean power levels.

A non-transitory computer memory storing instructions executable by a data processing apparatus and that upon such execution cause the data processing apparatus to perform operations comprising:

• for each of one or more communication channels, wherein each communication channel has a center frequency that is different from the center frequency of each other communication channel:
• periodically sampling a power level based on the center frequency at a sampling rate to obtain a plurality of samples;
• determining, from the plurality of samples, a plurality of mean offset values, wherein each mean offset value is an estimate of a received signal power at the center frequency relative to a reference signal level at the center frequency;
• for each mean offset value, determining whether the mean offset value indicates a presence of a valid reference signal;
• determining, from sets of power levels, where each set is used in determining a mean offset value that has been determined to indicate a presence of a valid reference signal, mean power levels from proper subsets of the sets of power levels;
• determining a difference between the mean power levels of two consecutive proper subsets of the power levels;
• and
• determining whether physical motion is occurring in a monitored area based on the difference between the mean power levels.