Communication apparatus and communication method for overhead reduction of WLAN sensing

A communication apparatus comprising:

• a transceiver, which in operation, receives signals in a wireless local area network (WLAN);
• and
• circuitry, which in operation, demodulates and decodes the signals, the decoded signals comprising a first physical layer protocol data unit (PPDU) and a second PPDU, wherein,
• the circuitry, in operation, performs full channel measurement based on a first physical layer (PHY) header of the first PPDU and a second PHY header of the second PPDU,
• the first PHY header and the second PHY header include long training fields (LTFs) for estimating channel quality,
• the second PPDU is received by the transceiver subsequent to the first PPDU, and
• the circuitry, in operation, calculates a first channel measurement parameter based on the first PPDU, calculates a second channel measurement parameter based on the second PPDU, and performs full channel measurement based on a difference between the first channel measurement parameter and the second channel measurement parameter.