Design And Simulation Of Digital Intermediate-frequency System

Digital intermediate frequency system is one of the hotspots in radio communication and military research, it provided a superexcellent way for high-speed double direction digital communication. The digital processing has a series of advantage of precision, dependable comparing to traditional processing. The current commercial DDC lack of high speed data processing and fast tune change, which limit the develop of the wideband digital receiver, so special digital intermediate frequency system is needed.In the paper, the emphasis is placed on the discussion of the algorithm of design and simulation of digital intermediate frequency system. Firstly, this paper introduces the basic theory and the key technology of digital intermediate frequency system, Secondly the method of the sampling rate conversion, multirate signal, and which is the important, essential theory in digital intermediate frequency system, is studied carefully. Then it analyses the components of the flow chat. Finally we simulated the designed system on SPW and the properties of the system is make out.