Experimental results with HF underwater acoustic modem for high bandwidth applications

Younce, James; Singer, Andrew C.; Riedl, Thomas; Landry, Blake J.; Bean, Andrew J.; Arikan, Toros

doi:10.1109/acssc.2015.7421124

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…The BER performance was evaluated as a function of signal-to-noise ratio (SNR). This simulation employed a signal with bandwidth B = 10 kHz to achieve the same rate as in [22], [23]. A total of 1000 random data blocks was transmitted with K = 32 symbols of a 4-QAM constellation.…”

Section: Simulationsmentioning

confidence: 99%

Modeling and Simulation of Underwater Acoustic Communication Systems

Chaves¹,

Martins²,

Diniz³

2017

Anais De XXXV Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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This work describes a simple model for underwater acoustic (UWA) channels, taking into account Doppler effects. The performance of orthogonal frequency-division multiplexing (OFDM) systems in UWA channels is also studied. The impact of Doppler effects on OFDM transmissions is thoroughly investigated, and a simple two-step compensation strategy is described. In order to evaluate UWA models, a versatile UWA channel simulator is developed and some simulations are performed to measure the OFDM performance for time-variant channels. Those simulations evaluate the bit-error-rate and sensitivity of OFDM systems to Doppler effects. The results are satisfactory and show that only one compensation step is necessary to maintain a reasonable system performance for relative estimation errors of Doppler scaling factor in the order of 10 −5 , corroborating that OFDM systems are suitable in some specific scenarios.

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Section: Simulationsmentioning

confidence: 99%

Modeling and Simulation of Underwater Acoustic Communication Systems

Chaves¹,

Martins²,

Diniz³

2017

Anais De XXXV Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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“…For example, in [8], low-power and low bit error rate (BER) amplitude shift keying (ASK), acoustic MODEMs were designed by using STM32F103 (STMicroelectronics, Paris, France), the BER was about 10 −3 at the distance of 100 m, while when the distance was about 500 m, the BER was approximately 10 −1 . A hydrophone was used to design on-off keying (OOK) acoustic MODEMs for video-capable with a high data rate in excess of 1 Mbps over 100 m in shallow water [9,10]. In one paper [11], an underwater acoustic orthogonal frequency division multiplexing (OFDM) MODEM was designed, the maximum data rate could reach 5200 bps at a distance of 1000 m. Moreover, the number of null sub-carriers, pilot subcarriers, and receivers in the MODEM in [11] were all configurable.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Multi-Function Hydrophone for Underwater Acoustic Application

Wang,

Zhou,

Yang

et al. 2023

JMSE

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In recent years, underwater acoustic applications have attracted much attention, for example, for underwater environmental monitoring, underwater exploration, etc. Hydrophones play a particularly important role. Although hydrophone design has been in multifarious application forms, it still needs to consider increasing demand for low-cost, low-consumption, and multiple-function devices, as well as issues around miniaturization, lossless data collection, etc. In this paper, we design a compact underwater acoustic device that has the capability of underwater acoustic signal storage, underwater acoustic signal transmission via the Internet, and decoding based on the direct sequences spread spectrum (DSSS). The key problem is how to implement multiple functions in only one micro-controller unit (MCU). The hardware and software of the proposed multi-function hydrophone are described in detail. In particular, the MCU, the pre-amplifier with gain control, and the analog-to-digital integrated chip are introduced. Moreover, underwater acoustic data storage, underwater acoustic transmission, and the DSSS receiver are depicted in terms of software. The different functions of the hydrophone are verified in sea trial experiments. The results show that the proposed multi-function hydrophone is able to sample underwater acoustic data at high quality. In addition, to demonstrate configurable parameters, the DSSS receiver with different carrier frequencies is provided. The proposed multi-function hydrophone realizes zero bit error rate (BER) when carrier frequency fc=9 kHz, and the BER with 10−3 order of magnitude when carrier frequency fc=15.5 kHz. The results show that the proposed multi-function hydrophone has great potential to explore the ocean.

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“…After the first underwater acoustic modems had been made available to cover specific market niches, their number has rapidly increased. This includes both commercial off-the-shelf (COTS) products [6,8,9,11,17,20] and research efforts aimed at next generation, high-bit rate [5,23], short range, as well as fully reprogrammable acoustic modems [7].…”

Section: Introduction and Related Workmentioning

confidence: 99%

Full Reconfiguration of Underwater Acoustic Networks through Low-Level Physical Layer Access

Campagnaro

Francescon

Kebkal³

et al. 2017

Proceedings of the International Conference on Underwater Networks &Amp; Systems

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Underwater acoustic communications experiments often involve custom implementations of schemes and protocols for the physical and data link layers. However, most commercial modems focus on providing reliable or optimized communication links, rather than on allowing low-level reconfiguration or reprogramming of modulation and coding schemes. As a result, the physical layer is typically provided as a closed, non-reprogrammable black box, accessible by the user only through a specific interface. While software-defined modems would be the ultimate solution to overcome this issue, having access to the symbols transmitted by the modems using a proprietary modulation format already opens up a number of research opportunities, e.g., aimed at the cross-layer design and optimization of channel coding schemes and communication protocols. In this paper, we take the latter approach. We consider the commercial EvoLogics modem, driven by a custom firmware version that bypasses the channel coding methods applied by the modem, and allows the user to set the transmit bit rate to any desired value within a given set. This makes it possible to evaluate different coding schemes in the presence of different bit rates. Our results show that the custom firmware offers sufficient flexibility to test different configurations of the coding schemes and bit rates, by providing direct access both to correctly decoded and to corrupted symbols, which can be separated at the receiver for further processing. In addition, Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for thirdparty components of this work must be honored. For all other uses, contact the owner/author(s).

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Experimental results with HF underwater acoustic modem for high bandwidth applications

Cited by 13 publications

References 21 publications

Modeling and Simulation of Underwater Acoustic Communication Systems

Modeling and Simulation of Underwater Acoustic Communication Systems

Design and Implementation of a Multi-Function Hydrophone for Underwater Acoustic Application

Full Reconfiguration of Underwater Acoustic Networks through Low-Level Physical Layer Access

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