Synchronizing signal extraction circuit for tdd system and method of the signal extraction

Abstract

The present invention relates to a technology applied to mobile communication, and more particularly to a circuit of extracting a synchronizing signal from a received signal for retransmitting the received signal in synchronization with the synchronizing signal in a repeater of a TDD system, etc. The circuit generates the synchronizing signal in a phase locked to a phase of the received signal and outputs the synchronizing signal through a signal extractor. A synchronizing signal extraction circuit according to example embodiments of the present invention includes a band pass filter 10 for passing a signal having a desired frequency, a signal detector 20 for detecting a synchronizing signal from an output of the band pass filter 10, a digital filter 30 for filtering an output of the signal detector to remove a noise, a digitally-programmed phase-locked loop (DPPLL) 40 for restoring the synchronizing signal from an output of the digital filter to lock a phase of an output of an oscillator, the oscillator 50 for generating an electrical oscillation of clock or pulse type, and a signal extractor 60 for outputting the synchronizing signal using the output of the oscillator. The present invention has wide applicability since the synchronizing signal is extracted from a signal of TDD type, has a relatively simple configuration and high performance since the DPPLL is used, can be manufactured compactly at relatively low cost since the small number of components are included, and may reduce problems such as heat generation due to lowered power consumption according to reduction of the number of components.

Dependencies are inferred from the claim text.