Abstract:

Digital Down-Converter is a key component of Variable-bandwise digital receiver.Since it is hard for the typical DDC structure to implement high operation rates of mixing and filtering,for the miniaturization and low power requirements of SDR (Software Defined Radio),a new method is proposed for implementing Digital Down-Converter in Variable-bandwise digital receiver based on FPGA.This method is based on orthogonal poly-phase filter processing.This paper analyzes the principle of its design and FPGA implementation,and finally gives the test results,which shows that the design has good scalability and flexibility.

Key words: SDR;DDC;orthogonal;poly phase filter;FPGA