Digital MMDS System at the core of the first channel coding and modulation source on the digital television standard,The modulated signal fed into the system through space launches and space coverage electromagnetic direct users. Image compression according to MPEG-2 standards, each 8 MHz bandwidth compression six sets of television programs,An increase in the number of programs several times, and image quality is close to DVD results, which occupies two-thirds of the lower bandwidth,Through digital CA system also makes the charges difficult issues left over by history have been solved and user-friendly management. The same power digital transmitter coverage radius than analog transmitters greatly improved.