基于DFT滤波器组的多信号高效数字下变频  

An Efficient Structure of Wideband Digital Down Converter Based on DFT Filter Banks

作　　者：蒋宗明[1] 唐斌[1] 吴伟[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054

出　　处：《电子科技大学学报》2005年第6期743-746,共4页Journal of University of Electronic Science and Technology of China

基　　金：国防科研基金资助项目

摘　　要：高速采样数据的快速下变频是大监视带宽数字接收机研究中的一个难点问题,该文基于DFT滤波器组提出了一种多信号的高效数字下变频结构。该结构在完成高采样率下的宽带高效数字下变频和采样率变换的同时,还具备并行处理多信号的能力,其结构中单级乘法结构的采用不仅缩短了处理时间,还减少了所需的硬件资源,在面对参数变化的信号时,优势更加明显。计算机仿真和FPGA硬件仿真验证了该结构的可行性。It is important that the high speed sampling data must be downconverted fast in the study of the wideband digital receiver. Based on DFT filter banks, an efficient structure of wideband digital downconverter, which can realize the Digital Down Conversion（DDC） and sampling rate change （SRC） of wideband signal, and multiple signals can also be processed easily in parallel form, is presented in this paper. Using the single level multiplication and parallel form in this structure, the computational time and hardware source exhaustion can be reduced. Algorithm and its FPGA implement computer simulation confirm the effectiveness of this structure.

关 键 词：DFT滤波器组 高效下变频滤波器 采样率变换 多信号 

分 类 号：TN971.1[电子电信—信号与信息处理]