Design of a FPGA-based Digital IF Receiver

In this paper,a new FPGA-based method of designing digital IF receiver is proposed.In this method,the peak of frequency is first detected by FFT algorithm,then a band-pass filtering and a quadrature transform are done.After this,the instantaneous phase of the transformed signal is calculated by CORDIC algorithm.Finally the frequency is estimated in a more precise way by the phase differential method.The outline of the design and its realization in FPGA are described in detail.Hardware simulation results show that the method has advantages of real-time performance and precision in pulse parameter measurement.