Patent ID: 7944983
Filing Date: 2011-05-17
Classification: H04L

Abstract:
1. 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 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 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 and estimating an integer coarse frequency offset estimate, Δ{circumflex over (f)} wherein I represents a search range and is given by a maximum frequency offset, [−Δf I,max , Δf I,max ].