Open AccessMulti‐carrier chaotic communication scheme for underwater acoustic communications
Author(s) -
Chen Menglei,
Xu Weikai,
Wang Deqing,
Wang Lin
Publication year - 2019
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2018.5524
Subject(s) - computer science , orthogonal frequency division multiplexing , bit error rate , underwater acoustic communication , multipath propagation , electronic engineering , chaotic , fading , communications system , diversity scheme , time diversity , rayleigh fading , spectral efficiency , keying , spread spectrum , telecommunications , channel (broadcasting) , underwater , engineering , oceanography , artificial intelligence , geology
Multi‐carrier (MC) and spread‐spectrum (SS) are two good technologies for underwater acoustic (UWA) communications. In this study, the authors propose a novel MC chaos modulation scheme, which combines code‐shifted differential chaos shift keying (CS‐DCSK) with orthogonal frequency division multiplexing (OFDM), namely MC‐CS‐DCSK. The proposed scheme exploits the orthogonal characteristic of the Walsh code to superimpose the chaotic reference chips and the information bearing chips in the same time/frequency unit. Besides, a cyclic‐shift interleaver is used on chips to harvest frequency diversity. To the in‐depth understanding of the proposed system, the bit error rate (BER) of the proposed system under Gaussian channels and multipath Rayleigh fading channels are derived and verified by simulation. Furthermore, the spectral efficiency of the proposed system is analysed and compared with some existing chaos‐based communication systems. Finally, they study BER performance of the system under UWA channels and compare it with traditional MC direct sequence SS and OFDM‐based MC‐DCSK systems. Simulation results show that the system has good robustness under time‐varying UWA channels.