FREQUENCY CORRECTOR, DEMODULATION CIRCUIT, RADIO, AND FREQUENCY CORRECTION METHOD
To provide a method of performing frequency correction with a small amount of calculation with good accuracy as a method of performing frequency correction by using a plurality of pilot symbols.SOLUTION: A frequency corrector includes a frequency correction value deriving unit that acquires phase in...
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Sprache: | eng ; jpn |
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Zusammenfassung: | To provide a method of performing frequency correction with a small amount of calculation with good accuracy as a method of performing frequency correction by using a plurality of pilot symbols.SOLUTION: A frequency corrector includes a frequency correction value deriving unit that acquires phase information for each pilot symbol and stores the phase information in a memory, complex-multiplies each data symbols a plurality of times according to a modulation scheme to generate a pseudo pilot signal, acquires phase information on each generated pseudo pilot signal, stores the phase information in the memory, and takes the average to derive the frequency correction value with reference to a phase information group stored in the memory, and a frequency correction unit that corrects deviation of an input signal on the basis of the frequency correction value.SELECTED DRAWING: Figure 1
【課題】複数のパイロットシンボルを用いて周波数補正する方式として、低演算量で良好な精度で周波数補正する手法を提供する。【解決手段】周波数補正器に、パイロットシンボル毎の位相情報をそれぞれ取得してメモリーに蓄積すると共に、データシンボル毎に該データシンボルを変調方式に合わせて複数回複素乗算して疑似パイロット信号をそれぞれ生成し、生成した疑似パイロット信号のそれぞれの位相情報を取得してメモリーに蓄積し、メモリーに蓄積された位相情報群を参照して、平均を採って周波数補正値を導出する周波数補正値導出部と、周波数補正値に基づいて入力信号の偏差を補正する周波数補正部と、を設ける。【選択図】図1 |
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