Digital Acoustic Telemetry of Color Video Information

Suzuki, Masaru; Nemoto, K.; Tsuchiya, Toshio; Nakanishi, Tsunehiko

doi:10.1109/oceans.1989.586703

Cited by 18 publications

(7 citation statements)

References 5 publications

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“…In addition, Nautile has the capability to acoustically transmit video images from its video cameras through the water column for viewing onboard the support vessel as still color pictures updated every 10 seconds. This video image transmission system was first developed for and used on DSV Shinkai 6500 (Suzuki et al, 1989) and extends the dive to the entire scientific party which can view images transmitted from the submersible in real time on video monitors on the support vessel. The Nautile group rotates to shore duty on a relatively frequent basis, unlike the Alvin group, which remains at sea for long periods of time.…”

Section: Hov Nautile and Cyanamentioning

confidence: 99%

Deep-Diving Manned Research Submersibles

Rona¹

1999

mar technol soc j

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The globalfleet ofdeep-diving manned research submersibles comprises thirteen human occupied vehicles (HOV), eleven of which are presently operational, managed by different agencies in France, Japan, Russia and the United States. The basic components of these submersibles are similar, but significant differences exist in capabilities and operational styles. The most efficient and effective use of deepdiving HOV's is as the final tool after the dive target has been located by a systematic search procedure of closing range using ships and unmanned vehicles (towed, ROV, or AUV) as platforms for various measurement, imaging and sampling methods. A key role continues to exist for deep-diving HOV's as the ultimate tool to investigate the deep ocean when judiciously used by the trained observer in coordination with other shipboard and unmanned deep submergence methods. The scientific value of the human presence within the deep ocean is irreplaceable by other methods.

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Section: Hov Nautile and Cyanamentioning

confidence: 99%

Deep-Diving Manned Research Submersibles

Rona¹

1999

mar technol soc j

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“…1) However, a UWA channel is an extremely complex communication environment characterized by large delay and Doppler spreads. 2) Specifically, an acoustic signal emitted by a transmitter (Tx) propagates with numerous reflections toward the receiver (Rx). Hence, the impulse response of a UWA channel has long but sparse reverberation tails.…”

Section: Introductionmentioning

confidence: 99%

“…In a single-carrier system, the Tx emits a time series of symbols and the Rx equalizes the delay and Doppler spreads by combining a decision feedback equalizer and digital phase-locked loop. [1][2][3][4][5][6][7][8][9][10][11] In an OFDM system, the Tx emits multiple symbols (symbol blocks) simultaneously on the different frequencies (subcarriers) (some subcarriers can be inactivated to avoid interference between subcarriers due to Doppler spread), and the Rx linearly equalizes the delay and Doppler spreads in the frequency domain. [12][13][14][15][16][17][18][19][20][21][22] Furthermore, the combination of transmission method and array signal processing have also been investigated to boost the performance of a communication system.…”

Section: Introductionmentioning

confidence: 99%

Improvement of communication quality using compressed sensing in underwater acoustic communication system with orthogonal signal division multiplexing

Tabata

Ebihara

Ogasawara

et al. 2020

Jpn. J. Appl. Phys.

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We propose the use of compressed sensing for an underwater acoustic (UWA) communication system with orthogonal signal division multiplexing (OSDM) to achieve reliable communication in UWA channels with large delay and Doppler spreads. However, OSDM does not fully exploit the characteristics of UWA channels, which have long but sparse reverberation tails. Hence, we propose an OSDM channel estimator using compressed sensing and evaluate its performance in simulations and experiments. The simulations revealed that the optimal gain determining the performance of the channel estimator depends on standard deviation of noise σ, and OSDM using compressed sensing outperforms normal OSDM. We also evaluate OSDM performance using compressed sensing in field testing in the coastal area of Suruga Bay, Japan. The experimental results suggest that compressed sensing can boost OSDM performance; the number of OSDM error blocks using compressed sensing is half that in normal OSDM. Thus, OSDM using compressed sensing provides reliable communication.

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“…to cope with ISI using adaptive equalizers such as DFE [1][2][3] . Moreover, it was found that the combination of DFE and array processing can increase communication quality [4][5][6][7][8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Experiment of Underwater Acoustic Communication with an Orthogonal Signal Division Multiplexing Scheme in a Harbor

Ebihara

Ogasawara

Mizutani

2014

J. Marine Acoust. Soc. Jpn.

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Underwater acoustic (UWA) communication is still a challenging area of research, as methods to deal with large intersymbol interference and Doppler spread are needed. We previously evaluated the performance of an orthogonal signal-division multiplexing (OSDM) scheme in a UWA communication system in a test tank and found that OSDM achieved better bit-error-rate (BER) performance than the singlecarrier with decision-feedback-equalizer (DFE) method and the orthogonal frequency-division multiplexing (OFDM) method. However, no experiments have yet been conducted in an actual sea environment, which is much more complex than a test tank. In this paper, we report an initial demonstration of OSDM communication in an actual sea environment. The experiment was performed at a harbor for about 85 h by changing the transmission level. We also performed the communication using single-carrier DFE and OFDM, and confirmed that OSDM with a multichannel receiver is attractive to existing schemes; as in the test-tank results, OSDM achieved the best bit-error-rate performance compared to other schemes with practical complexity. We confirmed that OSDM can achieve a highly reliable communication for UWA channels, such as in shallow water.

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Digital Acoustic Telemetry of Color Video Information

Cited by 18 publications

References 5 publications

Deep-Diving Manned Research Submersibles

Deep-Diving Manned Research Submersibles

Improvement of communication quality using compressed sensing in underwater acoustic communication system with orthogonal signal division multiplexing

Experiment of Underwater Acoustic Communication with an Orthogonal Signal Division Multiplexing Scheme in a Harbor

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