Patent ID: 7269236
Filing Date: 2007-09-11
Classification: H04L

Abstract:
1. A frequency offset estimator comprising: complex multiplying means for receiving an orthogonally detected complex demodulated symbol sequence, and calculating a product of said complex demodulated symbol sequence and a conjugate complex number of a known symbol sequence corresponding to said complex demodulated symbol sequence to remove a symbol information component; a plurality of power sum calculating means each for calculating a power sum for said complex demodulated symbol sequence based on an applied frequency offset after the symbol information component has been removed; and frequency offset control means for controlling a frequency offset applied to said each power sum calculating means based on power sums calculated by said plurality of power sum calculating means, estimating a frequency offset included in said complex demodulated symbol sequence, and delivering the estimated frequency offset, wherein said each power sum calculating means include phase rotating means for changing the phase of the complex demodulated symbol sequence based on the frequency offset applied thereto after the symbol information component has been removed, N-symbol adding means for adding a plurality of complex symbols delivered from said phase rotating means, and M-power adding means for calculating the power of the complex symbol sum calculated by said N-symbol adding mean while adding the power of a plurality of symbols.