Low Complexity Adaptive Turbo Equalization for Multipath Underwater Communication

Ye, Zi; Arbi, Tarak; Geller, Benoît

doi:10.1109/oceanse.2019.8866873

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…We first tested our proposal on a synthetic channel. Similar to [8], [9], [14], the channel response is modeled as follows:…”

Section: Simulations Resultsmentioning

confidence: 99%

Turbo Equalization for Underwater Communication Systems using Rotated Constellations

Arbi,

Geller,

2023

OCEANS 2023 - Limerick

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The available bandwidth of the underwater acoustic channel is severely limited. Therefore, it is of interest to use modulations with high spectral efficiency, such as rotated constellations. These constellations offer better theoretical performance than conventional constellations, without reducing the spectral or energy efficiency of the system. However, in practice, when conventional equalization algorithms are employed for a system using rotated constellations, the theoretical gains are not fully achieved. To address this issue, this paper proposes a new turbo equalization algorithm that inherently considers the characteristics of rotated signals and allows for a significant gain compared to conventional methods, as demonstrated by simulations, in particular over a real underwater channel.

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“…We first tested our proposal on a synthetic channel. Similar to [8], [9], [14], the channel response is modeled as follows:…”

Section: Simulations Resultsmentioning

confidence: 99%

Turbo Equalization for Underwater Communication Systems using Rotated Constellations

Arbi,

Geller,

2023

OCEANS 2023 - Limerick

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“…Finally, in addition to the Watermark real recorded channel, we also perform simulation on a synthetic channel. As in [11], [36], channel coefficients are modeled as: where the Doppler shift is characterised by , P l denotes the mean power of the l-th channel path, ψ l,i and ζ l,i are uniform random variables over [0, 2π[; I is fixed to 10 and (17) has three paths having all the same mean power in our simulation and is fixed to 0.002.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…This leads inevitably to Inter-Symbol Interference (ISI) which has to be addressed effectively so as to obtain a good system performance. In particular, Time Domain Equalization (TDE) can considerably enhance the system performance [11]- [18]; however, for the UWA channel, the channel delay spread can be large, leading to a high computational complexity at the receiver side. To face this issue, Frequency Domain Equalization (FDE) has been proposed [18]- [20], as it allows rather good system performance with lower computational complexity.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Turbo Equalization for Faster-than-Nyquist Underwater Communication Systems

Arbi

Geller

2021

OCEANS 2021: San Diego – Porto

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Faster-Than-Nyquist (FTN) signaling is a promising technique to enhance the UnderWater Acoustic (UWA) communications rate. However, the main issue of this technique is Inter-Symbol Interference (ISI) that needs to be tackled efficiently at the receiver side. To face this issue, we propose a new Hybrid Time-Frequency Domain Equalizer (HTDFE) for FTN UWA communication systems. In contrast to the conventional HTDFE, each Frequency Domain Equalizer (FDE) at the multiple output side is followed by a joint phase estimator and feedforwardfeedback Time Domain Equalizer (TDE). Simulations over a real underwater channel show that the proposed algorithm allows a gain in performance compared to the conventional solutions.

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“…Also in practice, acoustic waves are strongly disturbed by several physical phenomena: significant attenuation, noise, multipath, Doppler effect, low propagation speed of acoustic waves (around 1500 m/s), triply selective channel (time, frequency, space). All these combined effects limit data rates to just a few tens of kbits/s per km [13][14][15][16]. We also have developed a MIMO (Multi-input Multi-output) acoustic platform and obtained theoretical results about equalizing structures to face the harsh multipath acoustic underwater propagation.…”

Section: Underwater Acoustic Communicationmentioning

confidence: 99%

Bioglider: An Integrated Glider Solution for Enhancing Environmental Knowledge

Ponçon,

Mortier,

Picheral

et al. 2023

OCEANS 2023 - MTS/IEEE U.S. Gulf Coast

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This paper presents a technological solution for the observation and monitoring of the marine ecosystem. Three complementary devices, one optic imaging and one scientific acoustic instrument as well as one acoustic communication modem, have been integrated on glider platforms, providing qualitative and quantitative zooplankton and fish ecology observations, which are especially relevant in Nordic and Arctic polar regions. This 'Bioglider' solution has been tested on two available gliders. Another essential platform component for ocean observing are subsurface mooring lines which can complement glider observations in terms of temporal scales. Most of the time, they cannot have surface expressions in these regions because of sea-ice cover or harsh sea conditions, prohibiting real time data delivery. Underwater acoustic communication can allow the glider to serve as a data messenger, retrieving data from the moorings, complementing its measuring capacities. The Bioglider data transmission protocol and the Hydro-Acoustic Link Simulator were successfully tested in different test scenarios. We also developed a MIMO (Multi-input Multi-output) acoustic platform and obtained theoretical results about equalizing structures to face the harsh multipath acoustic underwater propagation. These developments address the challenges posed by sea-ice cover, harsh sea conditions, and maritime traffic, ensuring near real -time data delivery and enabling comprehensive observations of the marine environment. The Bioglider sensor solution and Bioglider data transmission solution have been implemented or designed for the existing and commercially available gliders and are validated by first promising results from an operational, technological and scientific point of view.

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Low Complexity Adaptive Turbo Equalization for Multipath Underwater Communication

Cited by 4 publications

References 28 publications

Turbo Equalization for Underwater Communication Systems using Rotated Constellations

Turbo Equalization for Underwater Communication Systems using Rotated Constellations

Hybrid Turbo Equalization for Faster-than-Nyquist Underwater Communication Systems

Bioglider: An Integrated Glider Solution for Enhancing Environmental Knowledge

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