Modeling and Simulation of Underwater Acoustic Communication Systems

Chaves, Rafael; Martins, Wallace A.; Diniz, Paulo S. R.

doi:10.14209/sbrt.2017.218

Cited by 4 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The stochastic-based UWA channel simulator is one of the main components of the operational framework, being responsible for receiving the statistical data from the modelbased CIR replay tool and for outputting CIRs. [41] introduced the stochastic-based UWA channel simulator presented in this paper, albeit not validated with experimental data. The validation is an important step to verify if the outputs of the simulator correspond to "real" CIRs.…”

Section: The Stochastic-based Uwa Channel Simulatormentioning

confidence: 99%

On Generating Monte Carlo Simulations of Underwater Acoustic Communication Systems with Application to Transmit Beamforming

Souza¹,

Pinho²,

Chaves³

et al. 2022

JCIS

View full text Add to dashboard Cite

Underwater Acoustic (UWA) communication systems still rely heavily on at-sea trials. This work presents an operational framework that significantly reduces the need for practical experiments. The key idea is to generate channel impulse responses (CIRs) drawn from probability density functions constructed based on trusted information and to employ Monte Carlo simulations to develop new UWA communication systems. Hence, the proposed operational framework depends only on cheaper-to-acquire physical measurements to produce CIRs. It comprises a model-based CIR replay tool and a stochastic-based UWA channel simulator. The former can be any model-based CIR replay tool, and the latter is proposed in this work and validated using data from four different practical experiments. We also carried out experiments for a transmit beamforming with signals digitally modulated in binary phase-shift keying, which were transmitted by an array and by a single source with equivalent power. For the array, the ideal transmit direction comes from the lowest bit error rate (BER) obtained with computer simulations. This paper compares the performance of the transmit array to the single source transmission and the results of a practical experimental transmission with a Monte Carlo simulation employing the proposed technique. We show that both achieved close results regarding BER and mean squared error. The conclusion is that the proposed operational framework, once adjusted to the specific transmission site, can be used to design new UWA communication systems, eliminating the burden of at-sea trials for tests of new transceivers. Finally, we conducted real-life transmit beamforming experiments to verify the BER gain obtained in practice using the steering angle obtained from simulations.

show abstract

Section: The Stochastic-based Uwa Channel Simulatormentioning

confidence: 99%

On Generating Monte Carlo Simulations of Underwater Acoustic Communication Systems with Application to Transmit Beamforming

Souza¹,

Pinho²,

Chaves³

et al. 2022

JCIS

View full text Add to dashboard Cite

show abstract

“…In general, the UWA channel is modeled as a time-variant linear system due to the Doppler effect [9]. However, in a situation where the Doppler effect can be neglected, the UWA channel becomes a time-invariant system, and the most predominant impairment becomes intersymbol interference (ISI).…”

Section: Introductionmentioning

confidence: 99%

On Equalization Performance in Underwater Acoustic Communication

Pinho¹,

Chaves²,

Campos³

2018

Anais De XXXVI Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

Self Cite

View full text Add to dashboard Cite

This paper presents the results of a practical experiment of underwater acoustic transmission, which was performed in Arraial do Cabo, RJ. The primary focus of this experiment is analyzing the performance of different types of equalizers, namely: zero-forcing (ZF), minimum mean square error (MMSE) and decision feedback equalizer (DFE). The mean square error (MSE) and bit-error rate (BER) are the figures of merit used to compare their performances. Results show that in terms of MSE, the DFE has better performance than the other equalizers, achieving an MSE of −25.6 dB for signal-to-noise ratio (SNR) equal to 10 dB. Furthermore, the DFE outperformed the ZF and MMSE equalizers, improving BER by 5.3 dB with respect to the ZF equalizer, and 3.4 dB with respect to the MMSE equalizer.

show abstract

Double the data rate in underwater acoustic communication using OFDM based on subcarrier power modulation

Alraie,

Alahmad,

Ishii

2024

J Mar Sci Technol

View full text Add to dashboard Cite

Underwater communication is one of the most important and difficult challenges facing researchers due to the high attenuation of the signal, communication with the surface because of the harsh medium of water, and data transmission performance degradation as a result of various effects. Underwater acoustic communication (UWA) has a low data rate, which describes the disadvantage of this type of communication. In addition, it has a low bandwidth range and high latency but has a long transmission range as an advantage. Multicarrier wireless transmission systems increase the data rate by sending the data using more than one carrier. We proposed a noncoherent orthogonal frequency division multiplexing (OFDM) method to increase the data rate in UWA communication systems. In addition, doubling the data rate in the OFDM using Subcarrier Power Modulation (OFDM-SPM) system can save half of the bandwidth. The MATLAB simulation program was used to implement the system in the underwater acoustic environment to increase its throughput. The proposed design uses Differential Phase Shift Keying (DPSK) with power control, and the data stream is transmitted through two-dimensional modulation schemes, the DPSK, and the power level of each subcarrier in the OFDM system with cyclic prefix (CP). The underwater channel was designed using a Rician fading multipath with a spreading loss formula as a function of distance and frequency. We designed an equalizer at the receiver side to recover the original signal as a function of three parameters which are: the channel effect as a rate between transmitting and receiving symbols, the Rician channel response, and the UWA spreading loss. OFDM-Subcarrier Power Modulation (OFDM-SPM) using the proposed equalizer performed better than the theoretical OFDM-SPM in the Rayleigh channel. The designed equalizer increased the performance of the OFDM-SPM system by 25% which helped to enhance the system’s throughput and doubled the data rate compared with the OFDM system, doubling the data rate using OFDM-SPM had been validated in laboratory experiments in the Time domain.

show abstract

Modeling and Simulation of Underwater Acoustic Communication Systems

Cited by 4 publications

References 21 publications

On Generating Monte Carlo Simulations of Underwater Acoustic Communication Systems with Application to Transmit Beamforming

On Generating Monte Carlo Simulations of Underwater Acoustic Communication Systems with Application to Transmit Beamforming

On Equalization Performance in Underwater Acoustic Communication

Double the data rate in underwater acoustic communication using OFDM based on subcarrier power modulation

Contact Info

Product

Resources

About