Digital Underwater Acoustic Communications

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 2252

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Electronics Engineering, Inha University, Incheon 22212, Republic of Korea
Interests: underwater communications; resource managements underwater communications; machine learning; etc.
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Special Issue Information

Dear Colleagues,

Our lives are tightly linked to the oceans on our planet. The resources available in oceans that cover 71% of the Earth have not been fully investigated yet, and natural disasters such as tsunamis attack many peoples. In order to utilize these resources and monitor the ocean environments, research has focused on various state-of-the-art technologies. Digital underwater communication is one of the important core technologies for these issues. When underwater IoT devices are connected to the fusion center, or control messages are conveyed to UUVs, digital underwater communication plays an important role. Unfortunately, even though digital communication in RF (radio frequency) has been developed, underwater environment obstacles, e.g., long propagation times, long multipath channel delay profiles, limited and narrow bandwidths, irregular Doppler shifts, etc., make it difficult to apply modern RF communication technologies to underwater communications. However, reliable and high data rate underwater communication requirements give rise to the development of various sophisticated underwater communication techniques, such as modulation/demodulation, channel estimation, multiple access, etc.

Prof. Dr. Jaehak Chung
Guest Editor

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Keywords

  • Underwater modulation/demodulation communication techniques
  • Underwater long/short range communication techniques
  • Underwater multiple access communications
  • Underwater covert communications
  • Interference issues and solutions of underwater communications
  • Underwater sophisticate receiver structures for reliable communications
  • Applications to underwater communications: underwater IoT, UUV, AUV, etc.

Published Papers (1 paper)

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Research

17 pages, 585 KiB  
Article
Sequence Design Technique for Accurate Timing and Cell ID Estimation in Underwater Acoustic Cellular Systems with a High Doppler
by Yeong Jun Kim, Muhammad Asim, Tae Ho Im and Yong Soo Cho
Electronics 2021, 10(19), 2413; https://doi.org/10.3390/electronics10192413 - 02 Oct 2021
Cited by 2 | Viewed by 1456
Abstract
In underwater acoustic cellular (UWAC) systems, underwater equipment or sensor nodes (UE/SN) should perform downlink synchronisation and a cell search during the initial access stage using the preambles received from adjacent underwater base stations (UWBSs). The UE/SN needs to estimate accurate timing and [...] Read more.
In underwater acoustic cellular (UWAC) systems, underwater equipment or sensor nodes (UE/SN) should perform downlink synchronisation and a cell search during the initial access stage using the preambles received from adjacent underwater base stations (UWBSs). The UE/SN needs to estimate accurate timing and cell ID (CID) using the received preambles, and synchronise with a serving UWBS, even in high-Doppler environments. In this paper, a sequence design technique for joint estimation of accurate timing and CID in UWAC systems with a high Doppler is proposed to decrease the receiver complexity and processing time. A generalised Zadoff–Chu sequence is proposed for the preamble design. This sequence is decomposed into multiple short sub-sequences to reduce the effect of Doppler shift on the timing and CID estimation. The performance loss caused by the short sequence length is compensated by combining the sub-sequences using the repetition property of the ZC sequence. The properties (autocorrelation and cross-correlation) of the proposed sequence are derived analytically in the presence of Doppler shift and compared with the simulation results. The simulation results reveal that the proposed technique performs better than existing techniques in both additive white Gaussian noise and multipath channels with a high-Doppler. It is concluded that the proposed technique is suitable for accurate timing estimation and CID detection in UWAC systems with a high Doppler. Full article
(This article belongs to the Special Issue Digital Underwater Acoustic Communications)
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