Patent ID: 7782753

Claim:
A method of channel estimation used in an orthogonal frequency division multiplexing (OFDM) system, the method comprising steps of: receiving a plurality of synchronized signals at a reception end of the OFDM system respectively from a plurality of sub-channels, wherein channel responses of an i th and a j th sub-channels are known, i+n=j, i, n and j are positive integers; and estimating the channel response of an (i+k) th sub-channel at the reception end of the OFDM system, according to the statistical properties derived from Jake's model and according to the channel responses of the i th and the j th sub-channels, wherein k<n and k is positive integer; wherein the channel response of the (i+k) th sub-channel comprises an amplitude response A i+k and a phase response θ i+k , and the step of estimating the channel response comprises: estimating at the reception end of the OFDM system the amplitude response A i+k of the (i+k) th sub-channel, comprising: obtaining a first amplitude correlation coefficient ρ e1 according to the sub-carrier frequency difference between the (i+k) th sub-channel and the ith sub-channel; obtaining a second amplitude correlation coefficient ρ e2 according to the sub-carrier frequency difference between the (i+k) th sub-channel and the j th sub-channel; and obtaining the amplitude response A i+k of the (i+k) th sub-channel according to the first amplitude correlation coefficient and the second amplitude correlation coefficient; and estimating at the reception end of the OFDM system the phase response θ i+k of the (i+k) th sub-channel, comprising: obtaining a first phase correlation coefficient ρ θ1 according to the sub-carrier frequency difference between the (i+k) th sub-channel and the i th sub-channel; obtaining a second phase correlation coefficient ρ θ2 according to the sub-carrier frequency difference between the (i+k) th sub-channel and the j th sub-channel; and obtaining the phase response θ i+k of the (i+k) th sub-channel according to the first phase correlation coefficient and the second phase correlation coefficient; and using the amplitude response A i+k of the (i+k) th sub-channel and the phase response θ i+k of the (i+k) th sub-channel to compensate the received signal to obtain a corrected signal at the reception end of the OFDM system.