软件无线电数字下变频及抽取技术研究

Software Defined Radio DDC and Decimation Technology

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 software defined radio receiver and digital down-conversion technologies are important contents for study of Sampling, which is aiming at multiple rate signals, and real time matching for the variable information symbol rate and fixed system sampling rate, are hard problems in researching the digitization of multi-rate signal. In this paper, these problems are solved by the combination of decimation and interpolation technologies. Based on this, the polyphase filter structure of the high-speed decimation and interpolation is emphatically studied, thus laying a foundation for the rapid-rate data match.