Patent ID: 9049088
Filing Date: 2015-06-02
Classification: H04L

Abstract:
1. A frequency offset estimation apparatus for a multi-carrier communication system, comprising: a fast Fourier transform (FFT) unit, configured to transform a reception signal from a time domain to a frequency domain, and to generate a plurality of samples corresponding to a plurality of symbols; a conjugate multiplier, configured to generate a plurality of correlating complex numbers by conjugate multiplying the samples corresponding to two consecutive symbols, wherein said consecutive symbols are corresponding to a plurality of predetermined subcarrier indices; a powering unit, configured to receive an exponent, raise the correlating complex numbers to a power of said exponent, and to generate a plurality of powered correlating complex numbers; and a calculation unit, configured to receive the powered correlating complex numbers and to estimate a frequency offset accordingly, wherein the frequency offset comprises at least one of a carrier frequency offset (CFO) and a sampling frequency offset (SFO).