Fig. 16From: M-ary nonlinear sine chirp spread spectrum for underwater acoustic communication based on virtual time-reversal mirror methodBER versus SNR graph proposed system in watermark channel a BER versus SNR graph of HCS Chirp, FCS Chirp and LFM with SF 9sHz and 8.65, respectively, and Chirp Period 10Â ms, b BER versus SNRBack to article page