Real time underwater communications

Labat, J.

doi:10.1109/oceans.1994.364249

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…Many proposals are trying to deal with this problem from different perspectives, for instance trying to minimize the end-to-end latency, increase the throughput, increase the link reliability, optimize synchronization, and increase the network efficiency. Although all these results are useful to improve the network performance, none of them ensure an upper-bounded message delay [ 36 , 37 , 38 , 39 , 40 , 41 ].…”

Section: Related Workmentioning

confidence: 99%

Real-Time Communication Support for Underwater Acoustic Sensor Networks

Santos

Orozco

Micheletto

et al. 2017

Sensors

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Underwater sensor networks represent an important and promising field of research due to the large diversity of underwater ubiquitous applications that can be supported by these networks, e.g., systems that deliver tsunami and oil spill warnings, or monitor submarine ecosystems. Most of these monitoring and warning systems require real-time communication in wide area networks that have a low density of nodes. The underwater communication medium involved in these networks is very harsh and imposes strong restrictions to the communication process. In this scenario, the real-time transmission of information is done mainly using acoustic signals, since the network nodes are not physically close. The features of the communication scenario and the requirements of the communication process represent major challenges for designers of both, communication protocols and monitoring and warning systems. The lack of models to represent these networks is the main stumbling block for the proliferation of underwater ubiquitous systems. This paper presents a real-time communication model for underwater acoustic sensor networks (UW-ASN) that are designed to cover wide areas with a low density of nodes, using any-to-any communication. This model is analytic, considers two solution approaches for scheduling the real-time messages, and provides a time-constraint analysis for the network performance. Using this model, the designers of protocols and underwater ubiquitous systems can quickly prototype and evaluate their solutions in an evolving way, in order to determine the best solution to the problem being addressed. The suitability of the proposal is illustrated with a case study that shows the performance of a UW-ASN under several initial conditions. This is the first analytic model for representing real-time communication in this type of network, and therefore, it opens the door for the development of underwater ubiquitous systems for several application scenarios.

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Section: Related Workmentioning

confidence: 99%

Real-Time Communication Support for Underwater Acoustic Sensor Networks

Santos

Orozco

Micheletto

et al. 2017

Sensors

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“…To achieve reliable communications under the underwater acoustic channel, intersymbol interference caused by multipath and carrier offset from Doppler effect should be mitigated. It is well known that with integrating equalisation techniques [6] and a phase locked loop (PLL) [7], the coherent communications can greatly reduce these effects and achieve high rate transmissions in practical underwater systems [8,9]. However, the performance is limited when the channel is rapidly varying.…”

Section: Introductionmentioning

confidence: 99%

Pilot‐assisted linear turbo equaliser over doubly selective channels

Huang

2014

IET Communications

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“…These are based on the joint optimization of equalizer, phase-locked loop (PLL). and delay-locked loop (DLL) [I], [2]. [I] is the first work to demonstrate feasibility of phase coherent techniques.…”

Section: Introductionmentioning

confidence: 99%

A digital acoustic transceiver for underwater communication without PLL and DLL

Choi¹,

Kim²,

Park³

et al. 2003

Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492)

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This paper proposes a phase coherent all-digital transceiver for undemater acoustic communication, which allows the system to reduce complexity and increase robustness in time variant underwater environments. It is designed in the digital domain except for amplifiers and implemented by using a multiple digital signal processors (DSPs) system. For phase coherent reception, conventional systems employed phaselocked loop (PLL) and delay-locked loop (DLL) for synchronization, but this paper suggests a new frame synchronization scheme based on the quadrature receiver structure without using them. DSP implementation is based on block data parallel architecture (BDPA).We show experimental results in the underwater anechoic basin at KRISO. The results indicate that the frame synchronization is performed without PLL. Also, we show that the adaptive equalizer can compensate frame Synchronization error and the correction capability is dependent on the length of equalizer.

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Real time underwater communications

Cited by 9 publications

References 2 publications

Real-Time Communication Support for Underwater Acoustic Sensor Networks

Real-Time Communication Support for Underwater Acoustic Sensor Networks

Pilot‐assisted linear turbo equaliser over doubly selective channels

A digital acoustic transceiver for underwater communication without PLL and DLL

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