Chirp信号与连续载波信号的多路复用传输

Multiplex Transmission of Chirp Signals and Continuous Carrier Signals

利用余弦信号和Chirp信号在频域、分数阶傅里叶域的优良能量聚集特性,设计了一种频带复用的通信系统.该系统在相同频带内同时传输多路分别以Chirp信号和余弦信号为载波的二相相移键控(BPSK)信号,通过在接收端进行相应阶的分数阶傅里叶变换,使载波信号达到最优能量聚集,进而通过分数阶域滤波将集中于某一窄带内的载波信号滤出,再反变换到时域完成解调过程.仿真分析表明,与添加余弦信号的系统相比,该方法有更好的抗干扰性能.

Based on the excellent energy concentration performance of cosine and Chirp signals in the frequency domain and the fractional Fourier transform （FrFT） domain, a communication system for frequency band reuse is designed. This system transmits multiplex BPSK signals respectively with cosine and Chirp signals as carriers within the same bandwidth, and performs the corresponding FrFY in the receiver to concentrate energies right around the peak of output. Moreover, the carrier signals in a narrowband are filtered in the FrFT domain, and are then demodulated in the time domain after an inverse FrFT. Simulated results show that the proposed system is of better antiinterference performance, as compared with the system only using cosine signals.