摘要
实信号处理实现正交检波时,通道间不匹配必然会产生镜像干扰。提出了一种复解析信号处理实现正交检波的新方法,从理论上消除了通道间不匹配所产生的镜像干扰。复解析信号处理需进行信号的Hilbert变换,分析了一种近似实现Hilbert变换的方法对系统性能的影响,给出了新方法的二阶采样数字化实现方案。与一阶数字化正交检波结构相比,二阶采样方案更利于实时实现。
When realizing quadrature detection based on real signal processing,mismatches between channels will surely produce image interference.A new method for design of quadrature detection based on complex analytic signal processing is presented,which eliminates the image interference caused by mismatches between channels in theory.Hilbert transform is needed in complex analytic signal processing.The effect from a rough Hilbert transform to the system is analyzed.Then the digital realizing project of second-order sampling is given.Compared with the one-order sampling digital quadrature detector,the second-order sampling project is advantageous to be realized in real time.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2010年第10期2045-2048,共4页
Systems Engineering and Electronics
关键词
正交检波
HILBERT变换
二阶采样
镜像抑制
quadrature detection
Hilbert transform
second-order sampling
image rejection
