摘要
论文采用了匹配滤波器和分数阶傅里叶变换对CRM(chirp-rate modulation)通信信号进行解调,推导了其理论解调误码率公式,将匹配滤波器解调和分数阶傅里叶变换解调的误码性能进行了对比分析;得到了影响解调性能的解析表达式,CRM通信信号抗多普勒频移能力较强,但对码同步误差较为敏感。通过仿真分析,验证了上述理论推导的正确性,分数阶傅里叶变换解调较匹配滤波解调性能差了约0.6d B^1.6d B,但其可避免载波恢复,大大简化了系统的同步设计。
This paper adopted the matched filter and fractional Fourier transform of the CRM（chirp rate modulation）commu-nication signal demodulation,and its theory of demodulation error rate formula is deduced,the matched filter demodulation and theber performance of fractional Fourier transform demodulation is analyzed. The analytical expressions that affect demodulation perfor-mance are obtained,and the communication signal of CRM is better than that of doppler shift,but it is sensitive to code synchroniza-tion error. Through the simulation analysis,validate the correctness of the theoretical derivation,the fractional Fourier transform de-modulation is matched filtering demodulation performance difference is about 0.6 d B^1.6 d B,it can avoid carrier recovery,greatlysimplifies the system design of synchronization.
出处
《舰船电子工程》
2017年第10期54-59,119,共7页
Ship Electronic Engineering
