Design Of Single Frequency Network For Terrestrial Digital Television Broadcasting In Hohhot Area

Ground wireless transmission of digital television as a traditional means of television broadcasting has developed rapidly in recent years,but the problem that comes with it is that no matter what the power of a single digital TV transmitter is,there will be a certain signal blind area or blind spot in high-rises and dense cities.When multiple transmitters work at the same time,adjacent transmitters using the same frequency will generate overlapping coverage areas,and in the overlapping areas,there will be some mutual interference of signals.In view of the above problems,the advantages of single-frequency network networking are shown.Single-frequency network networking can save limited spectrum resources,have good anti-interference performance,and can cover a wider geographical range with higher spectrum utilization efficiency.Based on the design of the single frequency network of terrestrial digital radio and television in Hohhot,this paper focuses on the design and analysis of the basic concept,key equipment,networking principle,solutions and network planning of the single frequency network.By adjusting the delay of exciter,various technical indexes of signal overlapping area of Inner Mongolia TV station and Hohhot 841 transmitting station are tested,and it is verified that the single-frequency network of two adjacenttransmitting stations can be well covered under the same frequency.It is concluded that the network of single frequency network can solve the problem that the adjacent transmitters transmit simultaneously in the overlapping area and can analyze the signals that can normally watch radio and television programs.