The core of Digital MMDS system is adopted digital TV standards in the source coding and channel modulation, the signal after modulation enter into transmission and the feed system and directly cover the users through the electromagnetic field of space. Image is in accordance with the MPEG-2 compression standard, each 8MHz bandwidth compress 6 sets of television programs, the quantity of programs increase several times and the image quality is closed to the DVD effect, the bandwidth occupied reduce 2 / 3. The difficult charging problem which is left in the history is solved through the CA system . It is convenient management for users.
