一种短波衰落信道下FSK信号FFT解调方法  

A Demodulation Method Using FFT for FSK Signals in HF Fading Channel

作　　者：王晓亚[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2015年第6期27-31,共5页Radio Communications Technology

摘　　要：对传统FSK信号的多种解调方法进行了简单介绍,在短波衰落信道下,由于多径和衰落的影响,其解调性能严重恶化,甚至不能得到正确的比特流。提出了一种基于时频域的FFT的FSK信号解调方法,利用FSK信号不同频率点处的功率谱峰值进行检测判决,并详细介绍了其实现方法。对其在高斯白噪声下的性能进行了仿真,性能与非相干包络解调理论性能相当,而对衰落信号,相比其他解调方法,此解调方法也可以给出较好的解调效果,适用于工程应用。The paper introduces some traditional FSK demodulation methods.In HF fading channels,due to the effect of multi-path and fading,traditional FSK demodulation methods may deteriorate in performance,even not being able to obtain the correct bit streams. A FFT-based demodulation method is proposed by analyzing the generation of FSK signal, the Fast Fourier Transform and the Short Time Fourier Transform.And the implementation of the method is introduced in detail. The simulation results show that this method is as efficient as the non-correlation demodulation algorithms.For fading signals ,this method,as compared with other demodulation methods, provides a good demodulation result,which proves its engineering applicability.

关 键 词：FSK信号 Fast FOURIER Transform(FFT) 解调 

分 类 号：TN915.04[电子电信—通信与信息系统] TN911.72[电子电信—信息与通信工程]