Research on Networking Technology of Digital Terrestrial Television Single Frequency Network

Abstract

China has promulgated a national standard for digital terrestrial television (DTT) transmission systems in 2006. In order to save radio frequency resources effectively, the current DTT single frequency network (SFN) has been widely used. The successful establishing of DTT SFN requires the frequency, time, and bits synchronization, however, China has a vast territory, and the programs broadcast by TV stations in different places are different. Therefore, the DTT coverage network must take into account the coverage needs of national, provincial, prefecture-level, and county-level programs, which poses a challenge to local governments' successfully establishing DTT SFN. This paper studies the SFN construction in complex transmission interconnections. It is proposed to add a cyclic redundancy check (CRC) word in the second-frame initialization packet (SIP) to enhance its accuracy and a new empty packet format is proposed in the SFN adapter to increase the stability of the SFN transmission stream. In addition, the current methods and key technologies of using satellite links, Internet protocol (IP) fiber optic and microwave links, and coaxial cable links to transmit programs and construct DTT SFN in China is analyzed. Finally, experiments are conducted to verify the feasibility of the above methods.