TIME SYNCHRONOUS TRACER FOR DIGITAL MOBILE COMMUNICATION SYSTEM USING ASYMMETRIC SMOOTHING FILTER

PURPOSE: A time synchronous tracer for a digital mobile communication system using an asymmetric smoothing filter is provided to accurately determine a signal transmission timing in a BTS(Base Transceiver Station) by measuring the reliability of a receiving signal using a level of the receiving signal and estimating the reliability of the receiving signal. CONSTITUTION: A sampling clock signal generator(1) receives a system clock signal(CK) and generates a sampling clock signal. A matching filter(2) filters a signal received in a mobile body so that an SN ration of an output is maximized. A signal power calculating unit(3) calculates a signal power of a signal outputted from the matching filter(2) and outputs the calculated signal power. A peak value detector(4) detects a peak value of a signal outputted from the signal power calculating unit(3). A reliability measurer(5) judges the reliability of a signal received in the mobile body using an output signal of the signal power calculating unit(3). A smoother(6) smoothes an output signal of the peak value detector(4) and adjusts a phase of the clock signal outputted from the sampling clock signal generator(1). A BTS determines whether a transmission timing of a transmission signal is updated according to the reliability of the signal received in the mobile body.