软件无线电中的A/D转换技术研究  

Research on A/D converting technology in software radio

作　　者：黄红兵[1] 曹敦[1] 吴志敏[1] 

机构地区：[1]长沙理工大学计算机与通信工程学院,湖南长沙410076

出　　处：《长沙交通学院学报》2007年第4期70-73,共4页Journal of Changsha Communications University

基　　金：湖南省教育厅科学研究项目(06C115)

摘　　要：分析了多种A/D采样方式,通过比较CIC滤波器、ISOP滤波器及FIR滤波器的特点和性能,提出了用FIR滤波器实现数字信号下变频的设想,并结合软件无线电的特点和A/D转换的技术指标,论述了软件无线电中A/D转换的最佳实现方法,该方法降低了信号采样率,减轻了后续DSP处理基带信号的压力.Various methods of A/D sampling were analyzed in this paper. By comparing the features and perfonnances of CIC filter, ISOP filter and FIR filter, an idea of utilizing FIR filter to realize digital signal DDC （ digital down - conversion） was put forward . Combined with characters of software radio and specifications of A/D converting, the optimal realization method of A/D converting was discussed. The sampling rate and the load of DSP was decreased when the base band signal was processed.

关 键 词：软件无线电 A/D 带通抽样 抽取滤波器 

分 类 号：TN911[电子电信—通信与信息系统]