Submarine communications

Callaham, Michael B.

doi:10.1109/mcom.1981.1090583

Cited by 20 publications

(7 citation statements)

References 3 publications

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“…Thus, the aforementioned optimal condition can be a good approximation. By examining (9) we can find that the imaginary part of the effective permeability is mainly determined by R c . Specifically, if we ideally assume that R c = 0, the imaginary part vanishes and by changing X or, equivalently, changing C, we can obtain any µ e f f as wish.…”

Section: Optimal Design Of M 2 I Antennamentioning

confidence: 99%

“…When sensors or communication devices are deployed in those environments, the lossy medium and numerous obstructions can destroy their wireless connections established by most, if not all, existing wireless techniques [6]- [8]. One of the solutions is to utilize the long wavelength VLF frequency signal [9], which requires the antenna size as large as 100 m long. However, the wireless devices, such as sensors and robots, working in the complex environments can not accommodate such large antennas or transmit enough power.…”

Section: Introductionmentioning

confidence: 99%

“…not all, existing wireless techniques [6]- [8]. One of the solutions is to utilize the long wavelength VLF frequency signal [9], which requires the antenna size as large as 100 m long. However, the wireless devices, such as sensors and robots, working in the complex environments can not accommodate such large antennas or transmit enough power.…”

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confidence: 99%

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Practical Design and Implementation of Metamaterial-Enhanced Magnetic Induction Communication

2017

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The wireless communications in complex environments, such as underground and underwater, can enable various applications in the environmental, industrial, homeland security, law enforcement, and military fields. However, conventional electromagnetic (EM) wave-based techniques do not work due to the lossy media and complicated structures. Magnetic Induction (MI) has been proved to achieve reliable communication in such environments. However, due to the small antenna size, the communication range of MI is still very limited, especially for the portable mobile devices. To this end, Metamaterial-enhanced Magnetic Induction (M 2 I) communication has been proposed, where the theoretical results predict that it can significantly increase the data rate and range. Nevertheless, there exists a significant gap between the theoretical prediction and the practical realization of M 2 I: the theoretical model relies on an ideal spherical metamaterial while it does not exist in nature. In this paper, a practical design is proposed by leveraging a spherical coil array to realize M 2 I communication. The full-wave simulation is conducted to validate the design objectives. By using the spherical coil array-based M 2 I communication, the communication range can be significantly extended, exactly as we predicted in the ideal M 2 I model. Finally, the proposed M 2 I communication is implemented and tested in various environments.

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Section: Optimal Design Of M 2 I Antennamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Practical Design and Implementation of Metamaterial-Enhanced Magnetic Induction Communication

2017

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“…Secondly, research on UAVs and underwater networking systems began as early as 1976. Karp evaluated the feasibility of optical wireless communication between underwater and satellite terminals [109]. In 1977, researchers at the Lawrence Livermore Laboratory at the University of California proposed a one-way optical communication system from UAV to submarine [110].…”

Section: Uav-avu Network Communicationsmentioning

confidence: 99%

Overview of Vehicle Optical Wireless Communications

et al. 2020

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Effective information transmission between vehicles has become one of the solutions to improve road safety. Based on the huge advantages of optical wireless data transmission technology, this paper summarizes the research status of unmanned vehicles in optical wireless communication (OWC). The article not only studies the actual progress of building optical links through an unmanned vehicle, connecting air communication, ground communication, and underwater communication into a unified wireless network, and realizing the fast, stable, large-capacity data transmission system. The technical challenges of unmanned vehicle OWC are also discussed and its future development has prospected. INDEX TERMS optical wireless communication, communication and networking, unmanned aerial vehicles, ground operated vehicles, autonomous underwater vehicle

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“…However, establishment of a reliable and effective underwater communication link has been a challenging problem for a long time [3]. In underwater environment, radio frequency communication is impractical due to high conductivity of seawater for electromagnetic waves [4]. Currently, underwater acoustic communication (UAC) [5] and underwater wireless optical communication (UWOC) [6] are major approaches for underwater wireless communications.…”

Section: Introductionmentioning

confidence: 99%

Polarized digital pulse interval modulation for underwater wireless optical communications

Dong

2016

OCEANS 2016 - Shanghai

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In practical underwater wireless optical communications (UWOC), pulse modulation technique has been widely used due to the high optical power efficiency and relatively low system complexity. Compared with the simplest on-off keying (OOK) scheme, digital pulse interval modulation (DPIM) improves both power efficiency and error performance and requires no symbol synchronization. Polarization shift keying (PolSK) is an another appropriate modulation scheme which can effectively restrain background noise. In this paper, we have proposed a polarized DPIM (P-DPIM) scheme by combining DPIM and PolSK to further improve the performance, and derived its bit-errorrate (BER) expression in additive white gaussian noise (AWGN) channel. Numerical results by Monte Carlo simulation in UWOC channel suggest that P-DPIM scheme can improve both the power efficiency and error performance as well as communication distance compared with traditional PPM and DPIM schemes. Therefore P-DPIM is more suitable for relatively low signal-tonoise ratio (SNR) scenarios.

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Submarine communications

Cited by 20 publications

References 3 publications

Practical Design and Implementation of Metamaterial-Enhanced Magnetic Induction Communication

Practical Design and Implementation of Metamaterial-Enhanced Magnetic Induction Communication

Overview of Vehicle Optical Wireless Communications

Polarized digital pulse interval modulation for underwater wireless optical communications

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