A Design And Implementation Of Digital Intermediate Frequency Receiver Module In Software Radio System

Conventional transceiver depends on hardware much more. The emergence of software radio results in transceiver's renovation. The basic idea is to sample RF signal, process the digital signal by installing different software to implement different functions on a high-speed DSP platform. Due to the limitation of device level, it is impossible to sample RF signal in direct now and have to choose the middle project---sampling IF signal, using special chips to build the intermediate frequency module.This paper discusses the realization of the digital intermediate frequency receiver module in software radio system. Firstly it expatiates on the theory of software radio, discussing the Multi-rate Sampling, Digital Down Converting(DDC) and the Digital Signal Modulation/Demodulation and so on. Then on the basis of those, a scheme of the system is given, and the hardware circuits are built with appropriate chips. In succession, it discusses the software programme development flow. Finally, its establishment simulation diagram of Simulink under the MATLAB environment. Carrying on the coherent demodulation intermediate frequency receive simulation and the analysis to the AM signal and the QPSK signal are on the system of Simulink.