调频信号数字解调算法的改进与实现  

Improvement and Implemenation of Digital Demodulation Algorithm for FM Signal

作　　者：鲁周迅[1] 马鑫[1] 吴昊[1] 

机构地区：[1]南京工业大学信息科学与工程学院,江苏南京210009

出　　处：《通信技术》2010年第3期32-34,共3页Communications Technology

摘　　要：介绍了一种调频离散信号无盲区解调算法,以适应各种载波下调频离散信号的变频和解调。首先获取数字载波,然后对频谱进行分析以获得完整信号频谱,再进行数字变频以获得多相滤波正交解调条件,最后通过二阶数字差分算法,从而实现调制信号的无失真解调。试验结果表明:该算法解决了调频信号解调时遇盲区无法解调的情况,实现调频离散信号无盲区数字解调,提高了频谱利用率。This paper,based on poly-phase sequence proposes a new algorithm of no-blind zone digital demodulation for FM signal.First a digital carrier of FM digital signal is captured,then the spectrum is analyzed to acquire the complete signal spectrum,then by digital frequency conversion,the condition for multiphase filtering quadrature is obtained,and finally by second-order digital differentiator algorithm,the modulated signal is demodulated without any distortion.Simulation indicates that this algorithm could accurately recover the modulated signal based on any carrier of FM signal.

关 键 词：调频离散信号 数字载波 多相滤波 带通采样 差分解调 

分 类 号：TN911[电子电信—通信与信息系统]