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In this paper, an underwater chaos-based DS-CDMA system is proposed. This system adopts a novel spreading sequence called chaotic phase modulation (CPM) sequence. Comparing with conventional pseudo-noise (PN) sequences, CPM sequence possesses series of advantages, such as higher security, much more quantity available and smaller cross-correlation coefficient, etc. The bit error rate (BER) is compared...
Direct-sequence spread spectrum (DSSS) is a candidate technique for long range acoustic communications (LRAC) in deep water. However, its data rate is quite low. To achieve a higher data rate, M-ary parallel combinatory communication (MPCC) scheme is adopted in this paper. The major obstacle encountered for LRAC is extended multipath propagation, which would cause severe inter-symbol interference...
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