Attack detection method for Wi-Fi secure ranging from transmitter to receiver

An attack detection method for Wi-Fi secure ranging from a transmitter to a receiver, the transmitter applying secure sequences on each symbol and each sub-carrier of K long training fields (LTFs), the receiver receiving the K LTFs each having N symbols, the method comprising:

• using a channel estimation (CE) result of N symbols in a first LTF of the K LTFs to generate an expected waveform of N symbols in a Kth LTF of the K LTFs;
• generating respective mean square errors (MSEs) of the N symbols in the Kth LTF;
• generating average MSEs for the symbols in the Kth LTF;
• and
• generating an attack detection result for the Kth LTF according to the respective MSEs of the N symbols in the Kth LTF and the average MSEs for the symbols in the Kth LTF;
• wherein K and N are positive integers, and K>1.

An attack detection method for Wi-Fi secure ranging, comprising:

• extracting a channel impulse response (CIR) from a channel estimation result of each long training field (LTF);
• obtaining a residual part by canceling the CIR from the channel estimation result;
• generating a channel estimation (CE) mean square error (MSE) of the CIR and the residual part;
• and
• generating an attack detection result for the Kth LTF according to a CE MSE of the Kth LTF and an average CE MSE of a first LTF to a (K−1) th LTF;
• wherein K is a positive integer larger than 1.