多进制chirp-rate键控调制及分数傅里叶变换法解调

Multiple chirp-rate shift keying and a demodulation method based on fractional Fourier transform

基于chirp信号chirp-rate和中心频率参数与其分数傅里叶变换特性之间的明确关系,提出了一种采用分数傅里叶变换法解调的多进制chirp-rate键控调制方式,该方式具有恒包络,并具有优于MPSK的误码性能。进而,将多进制chirp-rate键控与MFSK联合使用,通过参数调整,能够获得误码率性能与频谱效率间的折中。

Based on the explicit relationship between the fractional Fourier transform properties of chirp signals and their parameters（chirp-rate and central-frequency）,a novel modulation named multiple chirp-rate shift keying（MCrSK） which could be demodulated with a method based on fractional Fourier transform was proposed.This modulation holds a constant envelope and provides a better BER performance than MPSK.Further,MCrSK can be used with MFSK,which gives a trade-off between BER and bandwidth efficiency by modulation parameters adjusting.