Data Broadcasting Based On Dvb-s System

It is no doubt that the digital television (DTV) system will be the future-broadcasting mode instead of analogy TV system. The DTV system can not only provides high quality A/V programs, but also provides various digital services. Data broadcasting services is becoming a huge industry. Its future is prosperous. However, in China, digital television is still infancy, and the technology of data broadcasting based on the DTV system is immaturity. Many interrelated technologies of data broadcasting over DTV need to be researched. Main works of this paper is to carry some elementary research in this area.Firstly, this paper introduces the development of the DTV system and analyzes its current briefly. Based on all these factors, all kinds of key technologies details are discussed. This paper also gives a brief introduction about the standard of data broadcasting over DVB system in detail. Based on all these facts, this paper designs the system plan of data broadcasting system over DVB-S, and gives the analyze and test result of this system.The data broadcasting system put forwarded in this paper can be generalized in digital satellite television. The system can provide data broadcasting function in existed satellite TV system; it can provide long-distance education and file distribution services. It has all-purpose uses, high dependability. In addition, this system is easily maintained and updated, so it has a better prospect in actual uses.With the restrict of system bandwidth, the system can provides no real-time services such as multimedia teaching, and can not provides interactive function, the real-time performance of data transmission isn't so excellence; With the addition of satellite bandwidth and the introduction of new data broadcasting protocol, the system can achieve interactive function. It can provide real-time data broadcasting services such as stream-media.