Research Of Digital IF Receiver Based On DSP

In modern electronic systems, digital technology has become an inevitable trend. The digital receiver plays an important part in digital electronic systems, so the research of digital receivers becomes significant.This paper introduces the theory of digital receiver technology and its core technology, then, combined with the application requirements and research status quo, puts up the high-speed digital receiver implementations and does real-time simulation based on MATLAB and CCS software. It analyses the core of Digital IF Receiver Technology—Digital Down-conversion technology,which completed digital signal sampling rate conversion in order to ease the follow-up processing speed pressure of the digital signal processor. Digital down-conversion system consists of mixing, filtering, extraction, compensation, shaping and other operations. Among them, NCO's design in digital mixer uses DDS technology, and it adds a random sequence to eliminate the NCO stray. In the Multi-stage filter design, It makes full use of CIC and HBF, these two highly efficient filter, and compensates for the problem of excessive pass-band attenuation of the CIC by using the interpolation polynomial (ISOP), and achieved the intended effect.It introduces a novelty method which combines DSP and MATLAB. CCSLink connect the two environment.ETTIC6000 integrates DSP technology, it can create DSP executed code from Simulink model.Author's main work is based on TI's TMS320C6713 high-speed real-time processing hardware core, with the idea of software radio to complete digital IF receiver implementations design and system simulation. This simulation shows that the use of software radio design not only meet the design requirements, but also enhances interoperability between different systems, compatibility, flexibility and reliability, while reducing costs.