Methods and systems for detection of channel variations for wi-fi sensing in unobserved bandwidth

A method for Wi-Fi sensing carried out by a sensing device including at least one processor configured to execute instructions, the method comprising:

• receiving, by the at least one processor, first channel state information (CSI) of a first transmission channel representing a first sensing measurement performed on a first sensing transmission transmitted from a sensing transmitter to a sensing receiver in the first transmission channel;
• calculating, by the at least one processor, based on the first CSI, a time-domain channel representation (TD-CRI) of the first CSI by transforming the first CSI into the time domain;
• generating, by the at least one processor, a plurality of estimated channel responses corresponding to a plurality of transmission channels according to the TD-CRI;
• and
• determining, by the at least one processor, one or more preferred transmission channels from among the plurality of transmission channels according to the plurality of estimated channel responses.