Patent ID: 7023904

Claim:
A synchronization tracking circuit for synchronizing the phase of a despreading code sequence on a receiving side to the phase of a spreading code sequence on a transmitting side, comprising: a despreading code sequence generator for generating a despreading code sequence on the receiving side; a despreader for generating first and second despread signals by despreading a receive signal by the despreading code sequence on the receiving side at a first timing, that leads by a predetermined phase, timing of the spreading code sequence on the transmitting side and a second timing that lags, by the predetermined phase, the timing of said spreading code sequence; an interference-componenet estimation unit for estimating first and second interference components at said first and second timings inflicted by another path upon a prescribed path of interest among multiple paths; an interference-component elimination unit for eliminating the first and second interference components respectively from said first and second despread signals; and a phase control signal generator for generating a signal for controlling the phase of the despreading code sequence on the receiving side based upon the first and second despread signals from which the first and second interference components have been eliminated respectively.