Abstract
This paper focuses on the weak signal reception and atmospheric noise suppression in VLF Chirp spread spectrum communication system. Due to interference of atmospheric noise generated by lightning phenomena, it makes the chirp signal detection under low SNR condition becoming more difficult. Therefore, we select alpha stable distribution noise model to generate noise to simulate the real atmospheric noise. Then, we introduced a new technique of Chirp Spread Spectrum (CSS) communication based on Fractional Fourier Transform (FRFT). Finally, we study a nonlinear processing interference suppression method of clipping in time domain. Simulation results verified its feasibility.
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