短时傅里叶变换在频移键控解调中的应用  

Short time Fourier transform applies to frequency shift keying demodulation

作　　者：李伟[1] 谢华[1] 

机构地区：[1]电子科技大学自动化工程学院,成都611731

出　　处：《电子测量技术》2011年第7期34-36,42,共4页Electronic Measurement Technology

摘　　要：传统频移键控解调方法多使用带通滤波器法,带通滤波器的中心频率等于载波频率,但对于信号接收方而言,载波频率可能是不知道的,此时这种解调方法将不适用。针对传统频移键控解调方法的不足,将短时傅里叶变换引入到对频移键控的解调。此法能够在未知载波频率的情况下对频移键控信号实现解调。介绍了频移键控调制解调和短时傅里叶变换的原理及其实现方法。仿真结果表明短时傅里叶变换能够对频移键控信号有效解调。Band-pass filter usually be used in traditional frequency shift keying demodulation,and the center frequency equal to the the carrier frequency.But for the signal receiver,the carrier frequency may not be known,and then this demodulation method would not be inappropriate.In order to make up the shortfall of traditional frequency shift keying demodulation,short time Fourier transform is brought in it.This method can complete frequency shift keying demodulation without the carrier frequency.Introduces frequency shift keying modulation and demodulation,the theory of short time Fourier transform of and its implementation method.Simulation results show that the short time Fourier transform can be effective on the frequency shift keying demodulation.

关 键 词：频移键控 短时傅里叶变换 解调 

分 类 号：TN763.2[电子电信—电路与系统]