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介绍了一种基于软件无线电思想的高效数字下变频的实现方法,阐述了数字下变频中的数控振荡器、CIC滤波器、半带滤波器和低通滤波器的设计与实现。结合Matlab滤波器算法技术和在Quartus II系统下仿真,改进了滤波器组结构和参数。仿真结果表明,基于FPGA设计的数字下变频能够满足多制式短波电台性能指标要求,并且减少硬件资源消耗,具有灵活性、通用性和修改参数方便等特点。在多制式短波电台的应用中取得了较好的效果。
An implementation method of high efficiency digital down conversion based on software radio is introduced. The design and implementation of digital controlled oscillator, CIC filter, half band filter and low pass filter in digital down conversion are described. Combined with Matlab filter algorithm and simulation in Quartus II system, the structure and parameters of filter banks are improved. The simulation results show that the digital downconversion based on FPGA can meet the performance requirements of multi-mode shortwave radio, reduce the hardware resource consumption, and has the characteristics of flexibility, universality and convenient parameter modification. In the multi-system shortwave radio application has achieved good results.