摘要
对软件无线电接收机中数字下变频理论进行深入分析,提出了一种基于多类滤波器级联技术的DDC实现方案。采用疏状滤波器、半带滤波器和整形FIR滤波器级联实现数字下变频的抽取滤波,有效减少了乘法器和加法器需求及滤波器阶数,高效实现了数字下变频,达到了系统的设计要求。最后将该技术与传统的FIR滤波方法进行对比,进一步说明其可行性和优越性。
The theory of digital down conversion in software radio receiver is analyzed,and a scheme of realizing DDC based on cascade technique of multi-type filters is put forward.CIC（Cascaded Integrator-Comb） filters,HB（Half-Band） filters and plastic FIR filters are used to realize the decimation of DDC（Digital Down Conversion）,the order of filters and the requirement of multiplicators and adders are reduced effectively.The performance demanding of DDC is accomplished efficiently.Finally,the feasibility and superiority of this technique are shown by comparing it with conventional method of FIR filtering.
出处
《电子信息对抗技术》
2011年第4期72-76,共5页
Electronic Information Warfare Technology
关键词
数字下变频
积分疏状滤波器
半带滤波器
ISOP滤波器
抽取
digital down conversion（DDC）
cascaded integrator-comb filter
half-band filter
interpolated second-order polynomial filter
decimation
