Digital down conversion of the SIMULINK modeling and FPGA implementation

Digital down converter is the core technology of soft radio receivers. It lets the high-speed-sampled digital signals down-conversion to base band down at first. Then extraction, low-pass filter are conducted. This paper focuses on modeling and simulation by SIMULINK of digital mixing converter part and CIC decimation filter part of digital down converter and the realization on FPGA. The results show that the digital down-conversion, to reduce redundant data extraction method, can effectively solve those issues of too large computation pressure and too broad frequency-band channel encountered in the conventional A/D sampling DSP digital signal processing.