Patent ID: 7899084
Filing Date: 2011-03-01
Classification: H04J,H04L

Abstract:
1. A method for generating a switching timing signal for separating transmission signals into downlink signal(s) and uplink signal(s) in an optical repeater of a mobile communication system including an AP (Access Point), an AT (Access Terminal), a main donor and a remote each having a wavelength division multiplexer (WDM) with the optical repeater using a TDD (Time Division Duplex) scheme and an OFDM (Orthogonal Frequency Division Multiplexing) modulation scheme, the method comprising the steps of: (a) transmitting an RF signal received from the AP via the main donor of the optical repeater to the remote in the optical repeater; (b) extracting a part of the RF signal from a coupler in the remote, and transmitting the RF signal extracted from the coupler to a switching timing signal generating circuit in the remote; (c) deriving a pulse waveform signal from the extracted RF signal; (d) generating a reference pulse waveform based on a preamble of the RF signal; (e) correlating the pulse waveform signal from step (c) with the reference pulse waveform generated in step (d) to form a correlated comparison signal; (f) transmitting the correlated comparison signal from step (e) to a timing controller; (g) determining a frame start position directly from the output of said timing controller; (h) using the frame start position of step (g) to calculate a starting point for the downlink signal and for the uplink signal; (i) generating a switching timing signal by using the starting point information of the downlink signal and the uplink signal, and transmitting the switching timing signal to a switch of the optical repeater; and (j) using the switching timing signal for separately transmitting the downlink signal from the uplink signal.