数字采样及数字下变频技术是研究软件无线电接收机的重要内容之一。其中针对多种速率信号的采样，对

可变的信号符号率与固定的系统采样率进行实时匹配问题，是研究多速率信号数字化所遇到的难点问题之一。文中通过抽

取和内插技术的组合解决了这一问题。并在此基础上着重研究了高速抽取和内插的多项滤波结构，为数据率的快速匹配奠

定了基础。-Digital sampling and digital downconversion technology is an important part of research on software radio receiver. Which for a variety of sampling rate of the signal, the signal symbol rate variable and fixed system for real-time sampling rate matching problem is one of the difficult problems in research of multi-rate signal is digitized encountered. Inserted in the text of a combination of technology solves this problem by extracting and inside. And on this basis, focuses on the high-speed decimation filter structure and a number of interpolation, laid the foundation for the rapid match the data rate.