摘要
介绍一种基于软件无线电通用数字解调方法,它属于非相干解调。该方法是对FSK过零检测法的进一步扩展,能够对多种二进制数字信号进行解调。通过对信号幅度的灵活分步处理,将不同的码元对应为少数的几个数字,实现对数字信号的解调。该算法完全从时域着手,方法简单,运算量小。对FSK,ASK,PSK可以实现精确解调,对MSK信号的解调会出现一定误码率。
This paper introduces a general digital demodulation method based on software defined radio （SDR）, which is one kind of non-coherent demodulation types. And it is an improvement of zero crossing detection method generally used in FSK demodulation, by which many digital modulation signals can be demodulated. Through the step-by-step flexible treatment of sig-nal amplitude, the complex sampled data is transformed into digit sequence that is made up of several simple numbers. Then the multipurpose digital demodulation is completed with analyzing the digit sequence. This method based on time domain is charac- terized by simple algorithm and light computational load, which can accurately demodulate FSK,ASK, and PSK. There is low bit error rate for MSK signal.
出处
《现代电子技术》
2013年第1期83-85,共3页
Modern Electronics Technique
关键词
同幅度值信息提取
通用数字解调
非相干
软件无线电
same amplitude information extraction
general digital demodulation
non-coherent
software radio
