The Implement Of Turbo Encoder/Decoder By ASIC

The signal of the current civilization's development is information and transistion are increasing more and more.Obviously,how to insure the transmition of information is right is key of communication technology.Espicially,with the faster development of wireless communication,because of the wireless channel's complexity and particularity,the transmition's reliability is facing more difficult change.When analyzing the performance of communication system,we base the ideal AWGN channel usually. However,since wireless channel exists the characteristic of eclipse,current transmition of information faces more difficult change.If we can reduce the wrong code rate by increasing power,we don't need any technology for controling errors.unfortunly,almost communication systems'power is limited.In order to realize the current transmition and increasing rate,we need some methods to controling errors.So,people is looking for new,stronger method to metting the development of communication systems and wireless communication.in 1993, Berrou issue the turbo code,since its excellent performance ,more and more people begin to study the turbo code. Current communication beigns from the 1920's,experiences the first generation of analog communication and the second generation of cell communication.However,with the increasment of constoms ,people issue the third generation communication techonology .The primary ITU objectives for the 3rd generation mobile communication system are flexible/seamless global service provision and improved operational efficiencies , particularly for data and multimedia services. On the background of the 3rd Generation mobile communication system, the thesis firstly does some research on the basic principle of CDMA , the air interface requirements for IMT-02000, the interface developed by our country--TD-SCDMA and the core network layout of the 3rd Generation mobile communication system, then the thesis discussed the application of DSP to the 3G system especially to its channel decoding techniques. This thesis puts the emphasis on the encoding and decoding techniques of turbo This thesis outlines the theories of the decoding techniques, explains the programming techniques and the implementation steps for the encoding decoding algorithms , the decoding performances are analyzes in this thesis, too. This thesis is referential to research of the 3rd Generation mobile system and its decoding techniques. In the past,the popular design method of IC is inputting circuit diagram , floorplanning the circuit,placing and routing,then get the final layout.This method is used to the...