具有多通道可重构数字下变频系统

Reconfigurable Digital Down Conversion System with Multiple Channels

为了实现多波段多模式下的信号接收,提出了具有多通道可重构数字下变频系统。运用System Generator搭建单通道系统,同时选用Virtex6 ML605目标板来硬件实现。中频信号经过DDS混频之后得到差频信号,分别通过50倍和5倍降频、半带滤波器得到两路低频信号。将两路通道作为可重构配置文件,通过配置不同的配置文件来实现虚拟可重构的多通道数字下变频系统。可重构系统可较大程度提高资源利用率。

In order to achieve multi-mode multi-band signal reception,reconfigurable digital down conversion system based on FPGA with multiple channels is proposed.A single-channel system by system generator is built,which is generated as HDL code.Then the system is achieved on Virtex6 ML605 target board.Intermediate frequency is mixed by DDS,then sum frequency is got.After that signal is divided into two channels,one goes through 50 times CIC and decimation half-band filter to get a lower frequency,the other goes through 5 times down and half-band filter to get another frequency signal.Each module of two channels is designed as profile of dynamic configuration.Configuring different profiles achieves virtual reconfigurable multi-channel digital down-conversion system.Compared resources of each channel with reconfigurable system,reconfigurable system is higher utilization of resources.