摘要
数字中频接收机（DIFR），是在中频对输入信号进行直接采样，在数字域中完成下变频、滤波、相关解调等功能，是实现高性能接收机的一种有效途径，本文研究了相关理论和技术，介绍了数字下变频、数控振荡器、CIC滤波器，给出了一种基于FPGA的数字中频接收机的实现方案。
In digital intermediate frequency receiver （DIFR）, the input signal is sampled directly in intermediate frequency. Based on which, the processing of frequency down conversion, filtering, and correlative demodulating is finished in digital field. This makes DIFR be a effective approach for achieve high receiver performance. The relative theory and technique is studied in this paper. The digital down conversion, number control oscillator, and concatenation integral comb filter is introduced. Base on which, a scheme of FPGA based DIFR is proposed.
关键词
数字下变频
CIC滤波器
FPGA
Digital Down Conversion
Concatenation Integral Comb Filter
FPGA
