Performance limitations in underwater acoustic telemetry

Catipovic, Josko

doi:10.1109/48.107149

Cited by 247 publications

(84 citation statements)

References 39 publications

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“…However, a layer of ichthyoplankton with gas filled swim bladders would be problematic for both the dolphin and for echosounders at all frequencies. Because sound is difficult to transmit through a strong acoustic scattering layer and the signal can be distorted by the scatterers, the presence of a zooplankton thin layer also has implications for underwater acoustic communications across the layer (Catipovic, 1990). While the effects of acoustic scatterers on signal transmission have been examined mostly for human communications systems, the effects are likely to be similar for a fish sending a mating call or a dolphin whistling to a companion.…”

Section: Ramifications For Ocean Sensingmentioning

confidence: 99%

Layered organization in the coastal ocean: An introduction to planktonic thin layers and the LOCO project

Sullivan

Holliday

McFarland

et al. 2010

Continental Shelf Research

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Section: Ramifications For Ocean Sensingmentioning

confidence: 99%

Layered organization in the coastal ocean: An introduction to planktonic thin layers and the LOCO project

Sullivan

Holliday

McFarland

et al. 2010

Continental Shelf Research

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“…We derive our results using a Rayleigh fading model with no ISI. Rayleigh fading has been shown to be an accurate model for fully saturated shallow underwater channels [3]. Our results will show that the transmission range depends more significantly upon the frequency band for transmission rather than the data rate.…”

Section: Introductionmentioning

confidence: 68%

Rate-range for an FH-FSK acoustic modem

Parrish

Roy

Fox

et al. 2007

Proceedings of the Second Workshop on Underwater Networks - WuWNet '07

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Signals transmitted through underwater channels experience attenuation due to dissipation of acoustic energy by spreading as well as by absorption. The path loss due to absorption is found to be highly dependent upon the frequency. Ambient noise, which also greatly affects accurate reception of the signal, is also highly dependent upon frequency. For these reasons, the received SNR cannot be assumed to be constant over wideband acoustic signaling schemes. In this paper we determine the (signaling) rate vs. range curves for a FH-FSK modem considering the frequency selective nature of signal attenuation in an acoustic medium.

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“…The development of these systems began in the analog domain, but quickly switched to the digital domain where frequency shift keying (FSK) and more recently phase shift keying (PSK) (for increased bandwidth efficiency) are used for data modulation. Many detailed papers have been written concerning the history of underwater communications such as [5,14,15,16,45,110].…”

Section: Notationmentioning

confidence: 99%

Analysis of and techniques for adaptive equalization for underwater acoustic communication

Blair¹

2011

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Underwater wireless communication is quickly becoming a necessity for applications in ocean science, defense, and homeland security. Acoustics remains the only practical means of accomplishing long-range communication in the ocean. The acoustic communication channel is fraught with difficulties including limited available bandwidth, long delay-spread, time-variability, and Doppler spreading. These difficulties reduce the reliability of the communication system and make high data-rate communication challenging. Adaptive decision feedback equalization is a common method to compensate for distortions introduced by the underwater acoustic channel. Limited work has been done thus far to introduce the physics of the underwater channel into improving and better understanding the operation of a decision feedback equalizer. This thesis examines how to use physical models to improve the reliability and reduce the computational complexity of the decision feedback equalizer. The specific topics covered by this work are: how to handle channel estimation errors for the time varying channel, how to use angular constraints imposed by the environment into an array receiver, what happens when there is a mismatch between the true channel order and the estimated channel order, and why there is a performance difference between the direct adaptation and channel estimation based methods for computing the equalizer coefficients. For each of these topics, algorithms are provided that help create a more robust equalizer with lower computational complexity for the underwater channel.

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Performance limitations in underwater acoustic telemetry

Cited by 247 publications

References 39 publications

Layered organization in the coastal ocean: An introduction to planktonic thin layers and the LOCO project

Layered organization in the coastal ocean: An introduction to planktonic thin layers and the LOCO project

Rate-range for an FH-FSK acoustic modem

Analysis of and techniques for adaptive equalization for underwater acoustic communication

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