METHOD AND SYSTEM FOR GENERATING SWITCHING TIMING SIGNAL FOR SEPARATING TRANSMITTING AND RECEVING SIGNAL IN OPTICAL REPEATER OF MOBILE TELECOMMUNICATION NETWORK USING TDD AND OFDM MODULATION

摘要

Disclosed are a method and system for generating a switching timing signal for separating a transmitting and receiving signal in an optical repeater of a mobile telecommunication network by using a Time Division Duplex (hereinafter, referred to as 'TDD') scheme and an Orthogonal Frequency Division Multiplexing (hereinafter, referred to as 'OFDM') modulation scheme. According to one aspect of the present invention, there is provided a method for generating a switching timing signal to separate a transmission signal in an optical repeater of a mobile communication system including an AP, an AT and the optical repeater by using a TDD scheme and an OFDM modulation scheme, the method comprising the steps of (a) transmitting an RF signal received from the AP to a remote of the optical repeater via a main donor of the optical repeater; (b) extracting a part of the RF signal in a coupler of the remote, and transmitting the part of the RF signal to a switching timing signal generating circuit of the remote; (c) correlating the RF signal extracted from the coupler with the reference signal generated in the switching timing signal generating circuit; (d) detecting a frame start position of the RF signal by analyzing a correlation result value; (e) calculating starting points of a downlink signal and an uplink signal included in the RF signal on the basis of the frame start position; (f) generating the switching timing signal by using starting point information of the downlink signal and the uplink signal, and transmitting it to a switch of the remote; and (g) separately transmitting the downlink signal from the uplink signal by controlling the switch by using the switching timing signal. According to the present invention, it is possible to operate an optical repeater maintaining stability because the optical repeater of a mobile communication network using the TDD scheme and the OFDM scheme itself distinguishes between a downlink signal and an uplink signal, generates a switching timing signal to provide a path for each signal selectively, and controls a switch.