A method for acquiring a channel response, comprising: obtaining a channel estimation of each carrier of a (n-m) th frame to a (n-1) th frame by a Sounding Reference Signal; obtaining a cross-correlation matrix of each carrier of the (n-m) th frame to the (n-1) th frame by performing a conjugate multiplication on the channel estimations, and estimating a cross-correlation matrix of each carrier of a subframe p of a n th frame and the (n-m) th frame to the (n-1) th frame; filtering each element R̂ pq of the cross-correlation matrix of each carrier; and acquiring a channel response H(n) of each carrier of the subframe p of the n th frame via a linear prediction algorithm by using the cross-correlation matrices, wherein n, m and p are all positive integers, wherein the obtaining the cross-correlation matrix of each carrier of the (n-m) th frame to the (n-1) th frame by performing the conjugate multiplication on the channel estimates, and estimating the cross-correlation matrix of each carrier of the subframe p of the n th frame and the (n-m) th frame to the (n-1) th frame, comprises: an expression of the cross-correlation matrix of one carrier of the (n-m) th frame to the (n-1) th frame is as follows: R 1 = R ^ 1,1 R ^ 2,1... R ^ m − 1,1 R ^ m, 1 R ^ 1,2 R ^ 2,2... R ^ m − 1,2 R ^ m, 2............... R ^ 1, m − 1 R ^ 2, m − 2... R ^ m − 1, m − 1 R ^ m, m − 1 R ^ 1, m R ^ 2, m − 1... R ^ m − 1, m R ^ m, m, and the cross-correlation matrix of each carrier of the subframe p of the n th frame and the (n-m) th frame to the (n-1) th frame is as follows: R 2 = 10 − p R ^ 1,1 / 10 + p R ^ 1,2 / 10 10 − p R ^ 1,2 / 10 + p R ^ 1,3 / 10 ⋯ 10 − p R ^ 1, m − 1 / 10 + p R ^ 1, m / 10 10 − p R ^ 1, m / 10 + p R ^ 1, m + 1 / 10, wherein, R̂ pq represents a correlation coefficient of one carrier of a (n-p) th frame and a (n-q) th frame, which is obtained by performing a conjugate multiplication on the channel estimation of one carrier of the (n-p) th frame and the channel estimation of one carrier of the (n-q) th frame, wherein the channel response of each carrier of the subframe p of the n th frame is H n = ∑ i = 1 m a i H n − i; wherein, a i is obtained by a following equation: R 2 = R 1 a 1 a 2 ⋯ a m − 1 a m wherein, i is a positive integer. obtaining a channel estimation of each carrier of a (n-m) th frame to a (n-1) th frame by a Sounding Reference Signal; obtaining a cross-correlation matrix of each carrier of the (n-m) th frame to the (n-1) th frame by performing a conjugate multiplication on the channel estimations, and estimating a cross-correlation matrix of each carrier of a subframe p of a n th frame and the (n-m) th frame to the (n-1) th frame; filtering each element R̂ pq of the cross-correlation matrix of each carrier; and acquiring a channel response H(n) of each carrier of the subframe p of the n th frame via a linear prediction algorithm by using the cross-correlation matrices, wherein n, m and p are all positive integers, wherein the obtaining the cross-correlation matrix of each carrier of the (n-m) th frame to the (n-1) th frame by performing the conjugate multiplication on the channel estimates, and estimating the cross-correlation matrix of each carrier of the subframe p of the n th frame and the (n-m) th frame to the (n-1) th frame, comprises: an expression of the cross-correlation matrix of one carrier of the (n-m) th frame to the (n-1) th frame is as follows: R 1 = R ^ 1,1 R ^ 2,1... R ^ m − 1,1 R ^ m, 1 R ^ 1,2 R ^ 2,2... R ^ m − 1,2 R ^ m, 2............... R ^ 1, m − 1 R ^ 2, m − 2... R ^ m − 1, m − 1 R ^ m, m − 1 R ^ 1, m R ^ 2, m − 1... R ^ m − 1, m R ^ m, m, and the cross-correlation matrix of each carrier of the subframe p of the n th frame and the (n-m) th frame to the (n-1) th frame is as follows: R 2 = 10 − p R ^ 1,1 / 10 + p R ^ 1,2 / 10 10 − p R ^ 1,2 / 10 + p R ^ 1,3 / 10 ⋯ 10 − p R ^ 1, m − 1 / 10 + p R ^ 1, m / 10 10 − p R ^ 1, m / 10 + p R ^ 1, m + 1 / 10, an expression of the cross-correlation matrix of one carrier of the (n-m) th frame to the (n-1) th frame is as follows: R 1 = R ^ 1,1 R ^ 2,1... R ^ m − 1,1 R ^ m, 1 R ^ 1,2 R ^ 2,2... R ^ m − 1,2 R ^ m, 2............... R ^ 1, m − 1 R ^ 2, m − 2... R ^ m − 1, m − 1 R ^ m, m − 1 R ^ 1, m R ^ 2, m − 1... R ^ m − 1, m R ^ m, m, and the cross-correlation matrix of each carrier of the subframe p of the n th frame and the (n-m) th frame to the (n-1) th frame is as follows: R 2 = 10 − p R ^ 1,1 / 10 + p R ^ 1,2 / 10 10 − p R ^ 1,2 / 10 + p R ^ 1,3 / 10 ⋯ 10 − p R ^ 1, m − 1 / 10 + p R ^ 1, m / 10 10 − p R ^ 1, m / 10 + p R ^ 1, m + 1 / 10, wherein, R̂ pq represents a correlation coefficient of one carrier of a (n-p) th frame and a (n-q) th frame, which is obtained by performing a conjugate multiplication on the channel estimation of one carrier of the (n-p) th frame and the channel estimation of one carrier of the (n-q) th frame, wherein the channel response of each carrier of the subframe p of the n th frame is H n = ∑ i = 1 m a i H n − i; wherein, a i is obtained by a following equation: R 2 = R 1 a 1 a 2 ⋯ a m − 1 a m wherein, i is a positive integer.