一种可变带宽数字下变频器设计与实现

针对数字下变频器资源消耗多、信号处理时间长、运算效率低和难以处理多种带宽信号等问题,在研究数字下变频和多相结构运算特点的基础上,提出一种多相带通滤波结构设计,并利用恒速乘法、乘法器复用和多速率输入输出控制等技术实现了这一结构。软硬件仿真表明:该结构不仅能够实现多种带宽信号的正交数字下变频,而且,具有很高的运算效率和硬件资源利用率、较短的信号处理时间。

Design and implementation of digital downconverter with variable bandwidth

A design is presented to solve the problems of huge resource and time consuming,low computation efficiency and unsuitable for variable bandwidth signals,which are the bottleneck of digital down conversion(DDC),that provides a polyphase architecture of bandpass filter based on the research of the computation of the generalized DDC and polyphase architecture.Some approaches are presented,including multipliers with fixed working frequency,multipliers reusing,multirate input and output control etc,which provide the proposed architecture the capacity of DDC for signals with different bandwidth.At the same time,its computation efficiency is enhanced and the amount of multipliers and time for dealing with signal can also be reduced.Its perfect properties are verified by the results of software and hardware simulation.