CAJ | 학술논문

针对多进制Chirp-rate调制的通信系统解调算法由于基函数的正交性差导致实现复杂且性能不佳的特点，提出采用基于双正交Fourier变换的解调算法多进制的Chirp-rate调制行正交解调，解决了不同调频率的Chirp信号相互正交的问题，解调后可以得到信号调频率密度谱。BFT算法特点是信号在双正交基下展开，对多LFM信号分析不需要搜索，没有交叉项，特别适合对不同调频斜率组成的多LFM信号进行调频斜率分析。仿真表明其基于双正交Fourier变换的多进制Chirp-rate键控调制的解调算法具有接近MFSK误码率的性能。
침대다진제Chirp-rate조제적통신계통해조산법유우기함수적정교성차도치실현복잡차성능불가적특점，제출채용기우쌍정교Fourier변환적해조산법다진제적Chirp-rate조제행정교해조，해결료불동조빈솔적Chirp신호상호정교적문제，해조후가이득도신호조빈솔밀도보。BFT산법특점시신호재쌍정교기하전개，대다LFM신호분석불수요수색，몰유교차항，특별괄합대불동조빈사솔조성적다LFM신호진행조빈사솔분석。방진표명기기우쌍정교Fourier변환적다진제Chirp-rate건공조제적해조산법구유접근MFSK오마솔적성능。
According to the communication system and demodulation algorithm for M-ary Chirp-rate modulation due to the orthogonality of basis functions due to poor implementation complexity and poor performance, put forward using Chirp-rate modulation demodulation algorithm for orthogonal demodulating M-ary double orthogonal Fourier transform based on Chirp, to solve the signals of different frequency rate are orthogonal, the demodulated signal was FM density spectrum. The characteristics of the BFT algorithm is carried out in two orthogonal signal, the analysis on the multi LFM signal does not need to search, no cross terms, especially suitable for the analysis of multi LFM signal modulation slope composed of different frequency rate. Simulation results show that the demodulation algorithm for M-ary biorthogonal transform Chirp-rate key Fourier modulation based on BER performance close to MFSK.