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文章介绍了多进制数字调制中的频率解调。文中在多进制数字频率调制系统模型基础上,引入了M进制频率调制信号的表达式,采用嵌入傅氏变换理论和概率密度函数的方法,对M进制FSK信号的相位相干解调和非相干解调系统进行了分析,得到了系统的检测器采样值和最佳检测器将选择最大后验概率所对应的输出信号表述式的解析结果。
This article describes the frequency demodulation in multi-ary digital modulation. Based on the multi-ary digital frequency modulation system model, the expression of M-ary frequency modulation signal is introduced. By using the method of embedding Fourier transform theory and probability density function, the phase coherent demodulation of M-ary FSK signal and Non-coherent demodulation system was analyzed, the system’s detector sample values and the best detector will choose the maximum posterior probability corresponding to the output signal expression analytical results.