Patent ID: 7944983

Claim:
A method of estimating coarse frequency offset of received symbols based on a received frequency domain sample at a k th sub-carrier of a 53 rd Orthogonal Frequency Division Multiplexing (OFDM) data symbol in a j th time slot (TS) of a receiver in a China Multimedia Mobile Broadcasting (CMMB) mobile television network, said method comprising: dividing a received sample, Y k j , into two sets of noise only tones and data plus noise tones D k j , wherein said two sets is given as: Y k j = Y k j = { Z k j , k ∈ α 1 D k j + Z k j , k ∈ α 2 , wherein said α 1 represents a location of said noise only tones (Z k j ) and said α 2 represents a location of said data plus noise tones (D k j +Z k j ); obtaining a received sample only if there is a coarse frequency offset mismatch between a transmitter and said receiver, wherein said received sample is given as: Y k j =H k′ j *X k′ j +Z k j , wherein k′=k−Δf I ; dividing a summation of a power of said data plus noise tones by a summation of a power of said noise only tones to obtain Λ k j , wherein said Λ k j is represented as: Λ k j = ∑ n ∈ α 2 ⁢  Y n + k j  ∑ n ∈ α 1 ⁢  Y n + k j  ; and and estimating an integer coarse frequency offset estimate, Δ{circumflex over (f)} I j , of said received symbols based on a maximum value of said Λ k j , wherein said integer coarse frequency offset estimate, Δ{circumflex over (f)} I j , is given as: Δ ⁢ ⁢ f ^ I j = argmax k ∈ I ⁢ ( Λ k j ) , wherein I represents a search range and is given by a maximum frequency offset, [−Δf I,max , Δf I,max ].