Detecting signal modulation for motion detection

A device comprising:

• a modulation detector configured to identify a modulation type of a first signal, the first signal based on a wireless signal transmitted through a space by a transmitter device;
• a demodulator configured to receive the first signal and generate a second signal from the first signal, the second signal generated by demodulating the first signal according to the identified modulation type;
• a modulator configured to receive the second signal and generate a third signal from the second signal, the third signal generated by modulating the second signal according to the identified modulation type;
• processor circuitry configured to receive the first signal and the third signal and to:
• determine a channel response based on the first signal and the third signal;
• and
• detect motion of an object in the space based on the channel response.

A system comprising a motion detector device, the motion detector device comprising:

• a radio subsystem configured to receive wireless signals transmitted through a space by a transmitter device, and to generate respective baseband signals based on the received wireless signals;
• and
• a processor subsystem communicably coupled to the radio subsystem and configured to perform operations comprising:
• detecting a modulation type of the baseband signals;
• generating demodulated signals by demodulating the respective baseband signals according to the identified modulation type;
• generating re-modulated signals by modulating the respective demodulated signals according to the identified modulation type;
• determining channel responses based on the baseband signals and the re-modulated signals, each channel response based on a respective one of the baseband signals and a corresponding one of the re-modulated signals;
• and
• using the channel responses to detect motion of an object in the space.