Chirp FSK based on FRFT for underwater acoustic communication

Abstract

Chirp spread spectrum has poorly rate of transmission in shallow water acoustic channel because of its channel parameters in the random changes. This paper proposes a novel chirp spread spectrum modulation system based on the explicit relationship between fractional Fourier transform (FRFT) properties of Chirp-FSK signals and their parameters (Chirprate and central-frequency). The system is easy to control parameters and gives a trade-off between BER and rate of transmission by modulation parameters adjusting. The paper proposed spread spectrum communication system based on Chirp signal has good anti-noise and anti-multipath.