Patent ID: 6628606
Filing Date: 2003-09-30
Classification: H04L

Abstract:
A device for estimating a coarse frequency offset, which is included in a frequency offset estimator of an orthogonal frequency division multiplexing (OFDM) receiver, the device comprising:a buffer for receiving demodulated symbol X(k) and cyclic shifting the symbol X(k) by a predetermined shift amount d and outputting shifted symbol X(k+d); a reference symbol generator for generating a reference symbol Z(k); a counter for counting the shift amount of d; a partial correlation for receiving the shifted symbol X(k+d) and the phase reference symbol Z(k) and calculating a partial correlation value &Sum;m=0K-1&it;â€ƒ&it;&LeftBracketingBar;&Sum;k=m&it;â€ƒ&it;(N/K)(m+1)&it;â€ƒ&it;(N/K)-1&it;â€ƒ&it;X&it;â€ƒ&it;(((k+d)N)&it;â€ƒ&it;Z*&it;â€ƒ&it;(k))&RightBracketingBar;with respect to K divided bands, wherein a range of shift amount d is between âˆ’N/2 and N/2; anda maximum detector for obtaining a shift amount of d by which the partial correlation value is maximum, and outputting the shift amount of d as an estimated coarse frequency offset value.