Chirp-rate调制的新型解调方法

A novel demodulation method of Chirp-rate modulation

提出了一种基于分段去斜率的Chirp-rate调制解调方法。根据CRM信号以不同调频斜率的Chirp信号作为调制信号的特点,接收端分为两级解调,第一级解调采用延时混频(去斜率)的方法,把不同调频斜率的Chirp信号转换为MFSK信号,第二级采用非相干方式对MFSK信号解调。最后分析了二进制CRM信号经过高斯信道的性能,在高信噪比情况下略好于基于分数阶傅里叶变换的CRM系统。

In this paper,a new demodulation method based on chirp-rate modulation is proposed.There are two levels of demodulation at the receiving end.The first level use the method of time-delay frequency mixing（rate reduction）to convert the chirp signal with different chirp-rate into MFSK signal.The second level adopt the incoherent way to demodulation the MFSK signal.At the end of this paper,the performance of binary chirp-rate modulation through Gaussian channel is analyzed,which shows the performance of this system are better than the chirp-rate system based on FRFT in the condition of high SNR.