POINT-TO-MULTIPOINT TRANSMISSION METHOD OF MULTICARRIER SYSTEM FOR CONTINUOUS TRANSMISSION OF HIGH-SPEED MULTICARRIER DATA SIGNALS IN DIGITAL SUBSCRIBER LINE

摘要

PURPOSE: A point-to-multipoint transmission method of a multicarrier system for continuous transmission of high-speed multicarrier data signals in a digital subscriber line is provided to realize multipoint transmission and fast initialization. CONSTITUTION: In an activation and acknowledgement process, it is inspected whether a link is set up between an ATU-C(ADSL Terminal Unit-Central office) and an ATU-R(ADSL Terminal Unit-Remote)(82). In a transceiver training process, an AGC(Automatic Gain Controller) is controlled, power levels for upstream and downstream are decided, timing is restored, and an equalizer is trained(84). It is judged whether initialization is for a system initially purchased or a system already installed. In the case that the initialization is for a system initially purchased, four options to a data rate and a data form are transmitted to decide a level of transmission power and inspect a signal-to-ratio of each sub-channel(88). A bit number and a gain value of each sub-channel are decided(90). Initialization information is stored on a memory of a user equipment(92). A bit swapping algorithm is executed while transmitting actual data(96). In the case that the initialization is for a system already installed, the initialization information stored on the memory of the user equipment is downloaded after the transceiver training process, and the initialization information is transmitted and bit swapped(94). The bit swapping algorithm is executed while transmitting data(96).