基于多相滤波原理的数字正交采样技术  

Digital Quadrature Sampling Techniques Based on Polyphase Filtering

作　　者：罗星华[1] 苏涛[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《现代电子技术》2008年第3期27-30,共4页Modern Electronics Technique

摘　　要：针对传统正交采样方法存在运算数据量大,镜频抑制比小及硬件实现资源消耗大等方面的不足,分析了一种基于多相滤波结构的数字正交采样方法。首先对多相滤波法实现数字正交变换的原理进行了分析,然后根据多速率信号处理理论推导并给出了基于多相滤波结构的子滤波器的实现方法,最后,通过仿真验证了该方法的有效性。实验结果表明该方法较之传统的低通滤波法有很大的优越性。In view of the deficiency of the traditional quadrature sampling such as greater data stream, smaller image frequency ratio and vaster cost of resources,a new method based on polyphase filter is given in this paper. First,it gives an analysis of the principle of digital quadrature transformation based on polyphase filtering, then presents the method to implement branch filters based on the structure of polyphase filter according to the theory of multirate signal processing. Finally,a simulation by Matlab demonstrates the validity of this means,and results of the experiment also show its superiority over the traditional method.

关 键 词：中频采样 正交采样 多相滤波 镜频抑制比 

分 类 号：TN911.7[电子电信—通信与信息系统]