基于FPGA的数字中频信号处理的设计与实现

中频信号处理技术是目前发展迅速的一项技术。随着软件无线电理论的发展,数字下变频技术得到了越来越普遍的应用。本文讨论了数字中频接收机中变频、滤波等关键技术,利用FPGA编程实现了下变频处理和FFT处理。给出了FPGA实现的数字下变频系统在测试中产生的波形和频谱,作了测试结果分析。在某无线电分析仪中,该技术被成功的应用在基于FPGA的数字信号处理系统中。

Digital IF design is one of technologies which are in great progress.With the development of Software Defined Radio（SDR）theory,digital down converter（DDC）technology is get ing more and more extensive application.Some key techniques in Digital IF receivers,such as digital down converter,digital filter etc,are discussed.FPGA programming for the DDC and FFT are accomplished. Waves and spectra generated by FPGA DDC during tests are given and test results are analyzed.In a radio analyzer,this technique is successful y applied in the digital processing system based on FPGA.