Research On The Transmission Systems Of Mobile Television Standards

With the development of communication and information technology, people gain information not only by fixed networks, but also by mobile terminals. The service include not only sound by also multimedia. Media Mobile turns out and becomes more and more popular. Nowadays many countries are engaged in developing Mobile Digital Television Broadcasting System. They have made several mobile TV standards. For example, there are three main mobile TV standards in the world which are DVB-H made in Europe and ISDB-T made in Japan and T-DMB made in Korea. It is very important to make a research on the exsiting standards. It is helpful to make a mobile TV standard that has independent intellectual property rights for our country. It can accelerate the development of national TV industry. This article conducts research on three mobile TV standards DVB-H, ISDB-T and T-DMB and analyze the transmission system of the three mobile TV standards.The transmission systems of the three standards are simply introduced. They all have many similar modules which include RS coding, outer interleaving, convolutional coding and inner interleaving and OFDM and all of them are introduced in detail. Base on these, modeling is done on the transmission systems of the three standards. Author tests the whole transmission system of the three standards and then analyze the simulation results.Study indicates following conclusions: with the same channel feature, the error rate of ISDB-T is lower than that of DVB-H. The error rate of T-DMB is higher than DVB-H and ISDB-T. And from the results we can found that as the rate of signal to noise becomes higher, the error rate becomes lower. In the same transmission system, in order to get the same error rate, the coding rate is higher the needed rate of signal to noise is higher. Obviously we can found that high error rate is in cost of the rate of signal to noise.