Patent ID: 6683493
Filing Date: 2004-01-27
Classification: H04L

Abstract:
A timing regenerating device comprising:an in-phase component square calculation unit that receives a base band signal having a preamble symbol, calculates square of an in-phase component of the base band signal and outputs the squared in-phase component; an in-phase multiplier that multiplies a sign bit (Â±1) of the in-phase component of the base band signal to the squared in-phase component and outputs the result as signed squared in-phase component; an orthogonal component square calculation unit that receives the base band signal, calculates square of an orthogonal component of the base band signal and outputs the squared orthogonal component; an orthogonal multiplier that multiplies a sign bit (Â±1) of the orthogonal component of the base band signal to the squared orthogonal component and outputs the result as a signed squared orthogonal component; a squared-preamble in-phase correlation calculating unit that calculates a correlation value between the signed squared in-phase component and a Â½ symbol frequency component, and outputs the correlation value as an in-phase correlation signal; a squared-preamble orthogonal correlation calculating unit that calculates a correlation value between the signed squared orthogonal component and the Â½ symbol frequency component, and outputs the correlation value as an orthogonal correlation signal; a vector combination selecting unit that compares the magnitudes of the in-phase and orthogonal correlation signals, matches the direction of a vector obtained from the in-phase or orthogonal correlation signals whichever is smaller to the direction of a vector obtained from the in-phase or orthogonal correlation signals whichever is larger, combines these signals, and outputs a correlation signal after the combination as a combined correlation signal; and a timing phase difference calculating unit that outputs a phase control signal based on a vector angle shown by the combined correlation signal.