Patent ID: 8300717

Claim:
A sampling frequency offset estimation apparatus for an orthogonal frequency division multiplexing (OFDM) system, the apparatus comprising: a first differential operation unit configured to perform complex conjugate multiplication of scattered pilots of complex symbols subjected to a fast Fourier transform (FFT) in an OFDM receiver; an interpolation unit configured to repeat, for a predetermined, first number of times, an operation of obtaining a median complex symbol between two consecutive symbols among complex symbols having first phase difference information from the first differential operation unit; a second differential operation unit configured to perform complex conjugate multiplication of two consecutive median complex symbols among median complex symbols from the interpolation unit; and a sampling frequency offset estimation unit configured to estimate sampling frequency offset using complex symbols having second phase difference information from the second differential operation unit, wherein the interpolation unit is configured to obtain median complex symbols between the two complex symbols and to repeat, for a second number of times, an operation of obtaining a median complex symbol between the median complex symbols when the predetermined, first number is set to 3 or more, wherein the second number is the first number minus one.