一种改进的宽带数字下变频高效结构

该文首先分析了宽带数字下变频现有的高效结构能够实现高效性的根本原因及其存在的问题,接着通过公式推导求出新的实现方法:先抽取后滤波再用Goertzel滤波器实现混频过程直接获得同步调谐.通过与宽带数字下变频的一般结构和现有高效结构的比较,给出新结构的性能:对混频序列频点位置无任何限制、计算高效性、硬件复杂度适中.计算机仿真验证了新结构的有效性.

An Improved Efficient Architecture for Wideband Digital Down Conversion

First, this paper analyzes the very reason of efficiency in the existing efficient architecture for wideband Digital Down Conversion (DDC) and points out some problems, and then deduces a novel method: decimation prior to filtering and synchro-tuning by the use of Goertzel filter. By comparing it with the typical architecture and the existing efficient architecture for wideband DDC, performance of new method is discussed to be flexible, efficient and finite cost. Computer simulation illustrates its feasibility.