Data Modulator in Channel Modem for Satellite Communication System

摘要

The present invention relates to a data modulation apparatus in a channel modem for a satellite communication system which modulates by inserting " 0 " data into carrier sampling data addressed and input to the modulation unit of the channel modem for a satellite communication system. A modulation apparatus of a channel modem for a satellite communication system for shifting I, Q channel data transmitted from a voice data processor based on a clock signal, and multiplexing the same to address carrier sampling data, wherein the overall operation of the channel modem is controlled. A counter for adjusting and outputting a coefficient value according to a symbol rate transmitted from a channel unit processor, a multiplexer for multiplexing an input signal according to a clock signal by adding a signal output from the counter to the I and Q channel data, and a sampling interval The sampling data of the smallest carrier is the lookup table Including a stored memory, a data synthesizer for inserting "0" data into the carrier sampling data of the addressed memory, and a D / A converter for performing a D / A conversion based on the composite data output from the data synthesizer Characterized in that configured.