基于Hilbert变换的单边带调制系统设计与实现  

Based on Hilbert transformation single sideband modulation system design and realization

作　　者：陆存波 

机构地区：[1]北京圣非凡电子系统技术开发有限公司,北京100141

出　　处：《电子设计工程》2016年第12期138-140,145,共4页Electronic Design Engineering

摘　　要：为了解决基于希尔伯特变换的单边带调制系统中I/Q信号幅度不一致的问题,本文通过理论分析和公式推导的方法得出影响I/Q信号正交性的主要因素是滤波器的阶数,并通过试验分析了不同阶数的滤波器是如何影响I/Q信号的正交性的,得出了滤波器阶数要保证至少覆盖3.7个信号周期才能确保I/Q信号正交的结论。同时给出了在ADSP上实现希尔伯特滤波器的具体流程。此外,给出了基于AD9957的数字正交上变频的设计方法和实现流程。In order to resolve the non-quadrature of the I/Q signals in the single side band（SSB） modulation system which is based on the hilbert transform, based on the method of theoretical analysis and formula derivation the paper present that the main factor affecting the orthogonality of I/Q signal is the order of the filter, and analysis how the filter of different order affects the orthogonality of I/Q signal by means of experiments,It comes to conclusion that the filter order must be guaranteed at least 3.7 signal cycles to ensure that the I/Q signal is orthogonal. Meanwhile provides the flow of hilbert filter which is implemented on the ADSP. In addition, the paper presents the design method and realization process of the digital orthogonal upper frequency conversion based on AD9957.

关 键 词：单边带调制 希尔伯特变换 AD9957 ADSP 

分 类 号：TN99[电子电信—信号与信息处理]