Research On Wireless Access System Design And Realization In Shannxi Country

CDMA450 is a specified CDMA 1X technology using 450MHz frequency band. It guarantees less loss and wider coverage through wireless spreading path and also has outstanding advantage in voice clarity, selectivity, user satisfaction and the evolution to 3G standard. Since countryside users are widely scattered, the ability to realize large-region scale technology standard is desired to ensure wide coverage. CDMA450 moderately meets the request of countryside communication network set-up from all aspects including design concept, working frequency, capacity, bandwidth, coverage radius and investment amount. Therefore, how to make use of this technology to solve communication problems in countryside areas has become a hot issue.In the first part of the thesis, the construction of the CDMA450 wireless access system, its working principle and network set-up mode, interface capability are introduced; then the characteristics and advantage of 450MHz CDMA wireless access system in countryside communication environment is analyzed. After that, an overview of the network set-up scheme is provided with discussion on the layout of CDMA450 wireless access system. In the discussion, the preplan of two major flows and the detailed planning of the layout are carefully investigated with emphasis on coverage design and capability design. Then a specified design for the RASYS system adopted in wireless access project in Tongchuan countryside area is introduced. At last several practical problems and actual operation status of wireless access project in Tongchuan countryside area, including project construction background, project construction objective, scheme selection, problem solution are discussed in detail. The final conclusion of the thesis is that the countryside wireless access system project carried on in Tongchuan city is the optimal solution to fulfill countryside communication demand.