Patent ID: 7843805
Filing Date: 2010-11-30
Classification: H04L

Abstract:
1. A method for frequency offset estimation in frequency domain for a receiver of an orthogonal frequency division multiplexing (OFDM) system, wherein an input signal of the receiver of the OFDM system is transmitted via a plurality of subcarriers, the method comprising the steps of: via an ArTan module disposed within the receiver, calculating a phase angle of a signal field of the input signal after processing by Fast Fourier Transformation (FFT) and channel equalization; and via a frequency offset error module disposed within the receiver, estimating a frequency offset error originated from at least one frequency offset estimation process in time domain according to the phase angle, wherein the frequency offset error is proportional to a ratio of a difference and a sampling period of the OFDM system, and the difference is between the phase angle and a multiple of the sampling period and a frequency offset estimate of the at least one frequency offset estimation process based on a long preamble.