Design and Realization of the Demodulation System Based on the DSP and FPGA

For the snke of radio surveillance we design the hardware system with the function of IF data sampling, IF data processing and high speed data transferring. The system can scan the wideband frequency, lock the frequency of receiving data and convert the IF signal to digital data real-time. Direct A/D-converted data or data saved by SDRAM (when signal speed is too high) can be transmitted to PC by USB2.0 or to DSP by link port in order to complete the modulation detecting and intercepting of signals. The FPGA is responsible for the system coordination and the clock rate or the parameter of the system can be adjusted. The hardware experiment results prove that the system has good behavior. The results of the experimentation indicate that the system has achieved the objective of data acquisition and radio surveillance.