Method and device for estimation frequency offset in the OFDM system

摘要

PURPOSE: A method for estimating frequency offsets simplified in an OFDM(Orthogonal Frequency Division Multiplexing) system and a receiver thereof are provided to efficiently estimate frequency offsets by using a simplified near ML estimation function. CONSTITUTION: A receiver receives two OFDM signals from a transmitter(S301). A frequency offset estimation module of the receiver calculates a coefficient and a constant defined by using a received signal vector to generate a CFO(Carrier Frequency Offset) and a SFO(Sampling Frequency Offset) estimated according to a preset near ML estimation function(S302). The frequency offset estimation module calculates the CFO estimated by using a received signal vector and the coefficient and the constant calculated in a pre-stage(S303). The frequency offset estimation module calculates the SFO estimated by using the coefficient and the constant(S304).