Some key technologys of the PAS system and some ways of the terminal writing codes

Some key technologys of the PAS system are introduced in detail in this paper: such as the use of frequency and multi-access, micro cells and active distribution of the channels, V5 interface, data exchange across cells and ATC, authentication and the ways of modulation and so on. The Characteristics in which terminal of PAS is different from the terminal of GSM and CDMA are elaborated, and the special ways of writing codes for the terminal of PAS are introduced.