Moreover, this paper explores how to make use of DSP, CPLD, Digital down conversion (DDC) device, ect, to construct a SDR IF receiver which can carry out the demodulation function of AM signal if AM demodulationprogram is downloaded.

• 利用DSP、CPLD、数字下变频器等器件，构造了一个软件无线电中频接收系统，对该系统下载AM解调程序，它可以执行AM信号的解调功能。