基于Xampling的MWC系统设计与实现

Design and Implementation of MWC System based on Xampling

调制宽带转换器(Modulated Wideband Converter,MWC)系统是一个将原始的模拟信号送入多通道,进行同时调制滤波之后,以一个较低的采样率进行采样,为稀疏多频带信号采样率高的问题提供了一种欠采样解决方案,同时为解决目前商用模拟数字转换器(Analog-to-Digital Converter,ADC)难以满足现代通信需要的问题,提供了一套有效的解决方案。设计了一套利用现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)产生频带搬移所需要的伪随机序列,然后结合压缩感知基于Xampling恢复算法进行信号恢复的MWC系统。恢复出的信号与原始信号相比,虽然在频域上引入了能量很低的新的频谱分量,但是信号主要的参数没有改变。

The MWC modulation wideband converter system sends the original analog signal to multiple channels,and after simultaneous modulation and filtering,it is sampled at a under-sampling rate,which provides an under-sampling solution for the problem of high sampling rate of sparse multi-band signals.At the same time,it provides a set of effective solutions to solve the problem that the current commercial analog-to-digital converters(Analog-to-Digital Converter,ADC)cannot meet the needs of modern communication.This paper generates pseudo sign patterns exploiting FPGA and reconstruct the signal taking advantage of Xampling can reconstruct the original sparse signal unknown carrier frequency what is called blind restoration.Compared with the original signal,the blind restoration signal introduces new spectrum of low energy,but the main parameter has not changed.