scholarly journals Orthogonal Frequency Division Multiplexing Underwater Acoustic Communication System with Environmental Cognition Ability

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jinqiu Wu ◽  
Xiaofei Qi ◽  
Kang Guo ◽  
Jiaqiong Zhou ◽  
Yi Zhang
Keyword(s):  
Communication Networks ◽  
Acoustic Communication ◽  
Orthogonal Frequency Division Multiplexing ◽  
Adaptive Modulation ◽  
Adaptive Modulation And Coding ◽  
Underwater Acoustic Communication ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Underwater Acoustic ◽  
Environmental Cognition

In UWAC (underwater acoustic communication), UWA (underwater acoustic) channels change rapidly due to varying environment conditions. AMC (adaptive modulation and coding) is an efficient technique to improve system efficiency by changing transmission parameters according to channel conditions in UWA channels. In this paper, we propose an environmental cognition orthogonal frequency division multiplexing (OFDM) UWAC system and compare it with AMC algorithm with six transmission modes together with three threshold detection algorithms. Simulation and experimental results show the effectiveness of the proposed system. The system will play an important role in future communication networks which can significantly improve the efficiency of the system.

scholarly journals Orthogonal Chirp Division Multiplexing for Underwater Acoustic Communication

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3815 ◽  
Author(s):  
Yiqi Bai ◽  
Pierre-Jean Bouvet
Keyword(s):  
Acoustic Communication ◽  
Orthogonal Frequency Division Multiplexing ◽  
Underwater Acoustic Communication ◽  
Water Tank ◽  
Chirp Signal ◽  
Frequency Division ◽  
Transmission Scheme ◽  
Underwater Acoustic ◽  
Fresnel Transform ◽  
Performance Results

The objective of this study is to investigate a novel Underwater Acoustic Communication (UWAC) system based on a modulated chirp signal termed as Orthogonal Chirp Division Multiplexing (OCDM). Originating from the Fresnel transform, OCDM uses chirp signals to exploit the multipath diversity of the channel, achieving a good robustness against frequency fading, especially in the underloaded scenario where only a subset of the available waveforms is modulated. The implementation of the OCDM system for the UWAC scenario is described, and the performance results over an experimental water tank and realistic replayed underwater channel are compared against the traditional Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme.

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