Patent ID: 8275079

Claim:
A method for removing ranging interference in an orthogonal frequency division multiplexing (OFDM) signal, the OFDM signal comprising a plurality of OFDM symbols, the method comprising the steps of: receiving the OFDM signal; estimating a time delay and an energy value of at least one ranging code according to the OFDM symbols; generating a mask function according to the time delay and the energy value of the at least one ranging code; synthesizing the ranging interference in the OFDM signal according to the mask function; and removing the ranging interference from the OFDM signal; wherein the at least one ranging code is a plurality of ranging codes, the mask function is determined according to the following equation: w ⁡ ( n ) = ∑ i = 1 M ⁢ ∑ l = 1 L ⁢ C il ⁢ U ⁡ ( n - t il ) wherein w(n) represents the mask function, U(n−t il ) represents a step function for each of a plurality of paths associated with the ranging codes, C il represents a weight of each of the step functions, n represents a time index, M represents a number of the ranging codes, L represents a number of the paths for each of the ranging codes, and t il represents the time delay parameter of each of the paths associated with the ranging codes.