Patent ID: 7480353

Claim:
A method for estimating a channel response using a received OFDM signal, the method comprising: generating a reference signal matrix in accordance with a prepared known signal for channel response estimation; calculating a generalized inverse matrix of the reference signal matrix including singular values which exceed preset threshold value; estimating an impulse response of a channel modeled using a transversal filter based on a known signal included in the received signal and the generalized inverse matrix; and converting the estimated impulse response into a frequency-domain signal to acquire a frequency transfer function of the channel, wherein the generalized inverse matrix is given by ( A H ⁢ A ) - 1 ⁢ A H = ∑ i = 1 L - k ⁢ ⁢ 1 λ i · v i ⁢ w i H where A is the reference signal matrix,(A H A) −1 A H is the generalized inverse matrix, λ i is the singular value of the reference signal matrix A, w i is the M-dimensional singular vectors, v i is the L-dimensional singular vectors, M is the number of subcarriers of the OFDM signal, L is the number of paths included in the modeled channel, k is the positive integer higher than 0 and lower than L.