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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 introduces a blind-free demodulation algorithm of FM discrete signal to adapt frequency conversion and demodulation of FM discrete signals under various carriers. Firstly, the digital carrier is acquired, then the spectrum is analyzed to obtain the complete signal spectrum, and then the digital frequency conversion is performed to obtain the polyphase filter orthogonal demodulation condition. Finally, the second-order digital differential algorithm is implemented to achieve the distortionless demodulation of the modulated signal. The experimental results show that this algorithm can solve the problem that the blind spot can not be demodulated when the FM signal is demodulated, and the digital demodulation of the discrete signal of the FM without blind spot can be realized and the spectrum efficiency can be improved.