Patent ID: 8897121

Claim:
A method for frequency offset compensation and equalization in an orthogonal frequency division multiplexing system comprising: acquiring a channel estimation value h and a frequency offset value f at a reference symbol; acquiring a Toeplitz matrix M(f) based on the frequency offset value f; performing phase compensation on the channel estimation value h to obtain a channel estimation value h′ at a data symbol; and acquiring an estimation value of a transmitted symbol x based on M(f) and h′; wherein M(f)=(a k,l ), a k , l = { { sin ⁡ ( π ⁢ ⁢ γ ) N ⁢ ⁢ sin ⁡ ( π ⁢ ⁢ γ N ) } ⁢ exp ⁡ ( j ⁢ ⁢ π ⁢ ⁢ γ ⁢ N - 1 N ) , when ⁢ ⁢ k = l { sin ⁡ ( π ⁢ ⁢ γ ) N ⁢ ⁢ sin ⁡ ( π ⁡ ( l - k + γ ) N ) } ⁢ exp ⁡ ( - j ⁢ ⁢ π ⁢ l - k N ) ⁢ exp ⁡ ( j ⁢ ⁢ π ⁢ ⁢ γ ⁢ N - 1 N ) , when ⁢ ⁢ k ≠ l or when |k−l|>C, a k,l =0, C is a predetermined constant, and when |k−l|≦C, a k , l = { { sin ⁡ ( π ⁢ ⁢ γ ) N ⁢ ⁢ sin ⁡ ( π ⁢ ⁢ γ N ) } ⁢ exp ⁡ ( j ⁢ ⁢ π ⁢ ⁢ γ ⁢ N - 1 N ) , when ⁢ ⁢ k = l { sin ⁡ ( π ⁢ ⁢ γ ) N ⁢ ⁢ sin ⁡ ( π ⁡ ( l - k + γ ) N ) } ⁢ exp ⁡ ( - j ⁢ ⁢ π ⁢ l - k N ) ⁢ exp ⁡ ( j ⁢ ⁢ π ⁢ ⁢ γ ⁢ N - 1 N ) , when ⁢ ⁢ k ≠ l k and l are sub-carrier identifiers, a value range of which is 0 to m−1, m is the number of sub-carriers used by frequency offset estimation, γ = f F , F is an interval between the sub-carriers, N is the number of Fast Fourier Transform (FFT) points of one Orthogonal Frequency Division Multiplexing (OFDM) symbol.