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http://dx.doi.org/10.6109/jkiice.2016.20.8.1422

Turbo Equalization for Covert communication in Underwater Channel  

Ahn, Tae-Seok (Department of Radio Communication Engineering, Korea Maritime and Ocean University)
Jung, Ji-Won (Department of Radio Communication Engineering, Korea Maritime and Ocean University)
Park, Tae-Doo (Hanwha Corporation Gumi Plant (Development Team3))
Lee, Dong-Won (Hanwha Corporation Gumi Plant (Development Team3))
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.20, no.8, 2016 , pp. 1422-1430 More about this Journal
Abstract
Researches for oceans are limited to military purpose such as underwater sound detection and tracking system. Underwater acoustic communications with low-probability-of-interception (LPI) covert characteristics were received much attention recently. Covert communications are conducted at a low received signal-to-noise ratio to prevent interception or detection by an eavesdropper. This paper proposed optimal covert communication model based on direct sequence spread spectrum for underwater environments. Spread spectrum signals may be used for data transmission on underwater acoustic channels to achieve reliable transmission by suppressing the detrimental effect of interference and self-interference due to jamming and multipath propagation. The characteristics of the underwater acoustic channel present special problems in the design of covert communication systems. To improve performance and probability of interception, we applied BCJR(Bahl, Cocke, Jelinek, Raviv) decoding method and the direct sequence spread spectrum technology in low SNR. Also, we compared the performance between conventional model and proposed model based on turbo equalization by simulation and lake experiment.
Keywords
Low probability of interception; Spread spectrum; BCJR(Bahl, Cocke, Jelinek, Raviv); Turbo equalization;
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