关键词: 频带复用, 分数阶傅里叶变换, 载波信号, Chirp信号

Abstract:

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.

Key words: frequency band reuse, fractional Fourier transform, carrier signal, Chirp signal