Channel estimating method and device

1. A channel estimating method, comprising:

performing multi-path searching on a pilot channel, and performing interpolation on channel estimation values at radial positions of the multi-path searching;

performing raised cosine de-convolution on channel estimation values that undergo the interpolation; and

acquiring a channel estimation value at each radial position in the pilot channel according to channel estimation values that undergo the raised cosine de-convolution and sample deviation acquired by performing the multi-path searching.

2. The method according to claim 1 , wherein the performing interpolation on the channel estimation values at the radial positions during the multi-path searching comprises:

performing Sinc interpolation of truncating a limited length on the channel estimation values at the radial position of the multi-path searching.

3. The method according to claim 2 , wherein the performing the Sinc interpolation of truncating a limited length on the channel estimation values at the radial positions of the multi-path searching comprises:

performing convolution on each of the channel estimation values at the radial positions of the multi-path searching and a channel estimation value of an adjacent path of the radial position with a Sinc coefficient that undergoes windowing and truncation.

4. The method according to claim 1 , wherein the acquiring the channel estimation value at each radial position in the pilot channel according to the channel estimation values that undergo the raised cosine de-convolution and the sample deviation acquired by performing the multi-path searching comprises:

performing raised cosine convolution on the channel estimation values that undergo the raised cosine de-convolution, wherein a sampling rate of the raised cosine convolution is the same as a sampling rate of the raised cosine de-convolution; and

performing convolution on the channel estimation values that undergo the raised cosine convolution and a Sinc coefficient that undergoes windowing and truncation to acquire the channel estimation value at each radial position in the pilot channel.

5. The method according to claim 1 , wherein the acquiring the channel estimation value at each radial position in the pilot channel according to the channel estimation values that undergo the raised cosine de-convolution and the sample deviation acquired by performing the multi-path searching comprises:

performing raised cosine convolution on the channel estimation values that undergo the raised cosine de-convolution, wherein a sampling rate of the raised cosine convolution is higher than a sampling rate of the raised cosine de-convolution; and

selecting the channel estimation value at each radial position in the pilot channel according to the sample deviation acquired by performing the multi-path searching among the channel estimation values that undergo the raised cosine convolution.

6. A channel estimating device, comprising:

a search module, configured to perform multi-path searching on a pilot channel;

an interpolation module, configured to perform interpolation on channel estimation values at radial positions of the multi-path searching;

a raised cosine de-convolution module, configured to perform raised cosine de-convolution on channel estimation values that undergo the interpolation performed by the interpolation module; and

a channel estimation value acquiring module, configured to acquire a channel estimation value at each radial position in the pilot channel according to channel estimation values that undergo the raised cosine de-convolution and a sample deviation acquired by performing the multi-path searching.

7. The method according to claim 6 , wherein the interpolation module comprises:

a Sinc interpolation sub-module, configured to perform Sinc interpolation of truncating a limited length on the channel estimation values at the radial positions of the multi-path searching.

8. The device according to claim 7 , wherein the Sinc interpolation sub-module comprises a first Sinc interpolation sub-module, configured to perform convolution on each of the channel estimation values at the radial positions of the multi-path searching and a channel estimation value at an adjacent radial of the radial position with a Sinc coefficient that undergoes windowing and truncation.

9. The device according to claim 6 , wherein the channel estimation value acquiring module comprises:

a first raised cosine convolution sub-module, configured to perform raised cosine convolution on the channel estimation values that undergo the raised cosine de-convolution, wherein a sampling rate of the raised cosine convolution is the same as a sampling rate of the raised cosine de-convolution; and

an acquiring sub-module, configured to perform convolution on the channel estimation values that undergo the raised cosine convolution and a Sinc coefficient that undergoes windowing and truncation to acquire the channel estimation value at each radial position in the pilot channel.

10. The device according to claim 6 , wherein the channel estimation value acquiring module comprises:

a second raised cosine convolution sub-module, configured to perform the raised cosine convolution on the channel estimation values that undergo the raised cosine de-convolution, wherein a sampling rate of the raised cosine convolution is higher than a sampling rate of the raised cosine de-convolution; and

a selecting module, configured to select the channel estimation value at each radial position in the pilot channel according to the sample deviation acquired by performing the multi-path searching among the channel estimation values that undergo the raised cosine convolution.