Multi-carrier digital satellite broadcasting system and digital information transmission method thereof

Abstract

The invention relates to a multicarrier digital satellite broadcasting system and the digital information transmitting method thereof, comprising signal source coder, code modulator, transmitter, satellite, user demodulator and signal source decoder, where the signal source coder encodes analog signal into digital signal, which is transmitted to the code modulator for error control coding, constellation mapping, scrambling, OFDM modulation and signal mark addition to obtain transmitted frame group; the transmitted frame group is processed by time gap multiplexing, low-pass filtering, carrier high frequency modulation and synthesizing of various frequency data and finally transmitted to the transmitter; the transmitter transmits the high frequency signal to the satellite and is received bythe user demodulator by satellite broadcast; the user demodulator detects signal and demodulates the signal into data stream and transmits the data stream to the signal source decoder to be decoded into analog signal to be outputted to terminals. And it implements flexible multiplexing of multicast services and improves system flexibility.

Description

technical field [0001] The invention relates to the field of digital information transmission, in particular to a multi-carrier digital satellite broadcasting system and a digital information transmission method thereof. Background technique [0002] Satellite communication is an important branch of the communication industry. The satellite communication system is the product of the combination of electronic technology, communication technology and aerospace technology. It is mainly composed of communication satellites, earth stations, receiving stations, and measurement control and tracking systems. Compared with other communication methods, satellite communication has the advantages of large communication capacity, wide coverage, long communication distance, good transmission quality, all-weather work, high reliability, flexible and fast networking, and low cost. It is widely used in the construction of facilities, the realization of universal service and the national info...

AI Technical Summary

Problems solved by technology

[0011] With the help of error correction function or multi-channel technology, digital satellite broadcasting in Japan and South Korea allows users to receive signals no matter they are indoors or outdoors, or on cars, ships, or trains, that is, it supports mobile reception, but the actual application effect From the point of view, the performance is still not ideal and needs further improvement

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