Patent ID: 7471718
Filing Date: 2008-12-30
Classification: H04B

Abstract:
1. A synchronous follow-up circuit comprising: a symbol timing generator responsive to an input received signal for generating an adjusted receive signal having a phase adjusted and a symbol timing signal; a symbol correlator for operating correlation of the adjusted receive signal to generate a correlation value; and a correlation power operator for carrying out power operation of the correlation value to generate a power value, said symbol correlator shifting the phase of the adjusted receive signal to resultantly operate correlation between a synchronous adjusted receive signal synchronizing in phase with the phase of the symbol timing and adjusted receive signals having the respective phases earlier and later than the phase of the synchronous adjusted receive signal at a timing corresponding to the symbol timing signal to generate a plurality of correlation values corresponding to the phases, said correlation power operator generating a plurality of power values respectively corresponding to the plurality of correlation values, said synchronous follow-up circuit further comprising: a correlation power comparator for comparing the plurality of power values with each other to generate a comparison result indicating a phase adjustment of the adjusted receive signal; and a correlation power decision circuit for comparing a synchronous power value based on the synchronous adjusted receive signal with a predetermined threshold value and carries out determination to generate the decision result, the comparison result in said correlation power comparator being nullified on a basis of the decision result, said symbol timing generator adjusting the phase of the adjusted receive signal on a basis of the comparison result.