A method for testing the wide-sense stationary uncorrelated scattering assumption fulfillment for an underwater acoustic channel

Kochańska, Iwona; Nissen, Ivor; Marszal, J.

doi:10.1121/1.5023834

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…In [14] the method of testing, if the impulse response measured with the probe signal s(t) satisfies the assumption of WSS, it is presented. It is based on testing the similarity of the autocorrelation functions:…”

Section: Testing Wide-sense Stationary Assumption Fulfilmentmentioning

confidence: 99%

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Assessment of Wide-Sense Stationarity of an Underwater Acoustic Channel Based on a Pseudo-Random Binary Sequence Probe Signal

Kochańska

2020

Applied Sciences

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The performances of Underwater Acoustic Communication (UAC) systems are strongly related to the specific propagation conditions of the underwater channel. Designing the physical layer of a reliable data transmission system requires a knowledge of channel characteristics in terms of the specific parameters of the stochastic model. The Wide-Sense Stationary Uncorrelated Scattering (WSSUS) assumption simplifies the stochastic description of the channel, and thus the estimation of its transmission parameters. However, shallow underwater channels may not meet the WSSUS assumption. This paper proposes a method for testing the Wide-Sense Stationary (WSS) part of the WSSUS feature of a UAC channel on the basis of the complex envelope of a received probe Pseudo-Random Binary Sequence (PRBS) signal. Two correlation coefficients are calculated that can be interpreted, together, as a measure that determines whether the channel is WSS or not. A similar wide-sense stationarity assessment can be performed on the basis of the Time-Varying Impulse Response (TVIR) of a UAC channel. However, the method proposed in this paper requires fewer computational operations in the receiver of a UAC system. PRBS signal transmission tests were conducted in the UAC channel simulator and in real conditions during an inland water experiment. The correlation coefficient values obtained using the method based on the envelope of a probe signal and the method of analysing the TVIR estimates are compared. The results are similar, and thus, it is possible to assess if the UAC channel can be modelled as a WSS stochastic process without the need for TVIR estimation.

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Section: Testing Wide-sense Stationary Assumption Fulfilmentmentioning

confidence: 99%

“…In [14], a novel time-domain method for verifying the WSS feature of UAC channels is described. Statistical properties of the real and imaginary parts of the impulse response, measured using the correlation method, are exploited to test the WSS assumption fulfilment.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Wide-Sense Stationarity of an Underwater Acoustic Channel Based on a Pseudo-Random Binary Sequence Probe Signal

Kochańska

2020

Applied Sciences

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“…It can be shown that, in addition to the noise level, the range and accuracy of bearings also depend on noise correlation (Rudnicki et al, 2020). The problem also applies to detection in underwater acoustic communications UAC (Kochańska et al, 2018;Schmidt et al, 2018). Active, narrow-band systems typically assume that acoustic ambient noise is uncorrelated (Burdick, 1984;Urick, 1983;1986).…”

Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

Rudnicki,

Salamon,

Marszal

2021

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Various types of passive sonar systems are used to detect submarines. These activities are complex and demanding. Therefore, computer simulations are most often used at the design stage of these systems. For this reason, it is also necessary to simulate the acoustic ambient noise of the sea. The article proposes a new numerical model of surface and quasi-spherical sea noise and presents its statistical parameters. The results of the application of the developed noise model to analyse the received signals of the DIFAR 1 sonobuoy are also presented.

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“…Thus, the signals transmitted in UAC systems suffer from time-variability of multipath propagation conditions (Kochańska et al, 2016). Moreover, a UAC channel cannot always be described as wide-sense stationary with uncorrelated scattering (WSSUS), as is commonly assumed in the case of radio-communication channels (Kochańska et al, 2018;Sklar, 1997).…”

Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

Kochańska

Schmidt

Marszal

2019

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The large variability of communication properties of underwater acoustic channels, and especially the strongly varying instantaneous conditions in shallow waters, is a challenge for the designers of underwater acoustic communication (UAC) systems. The use of phase modulated signals does not allow reliable data transmission through such a tough communication channel. However, orthogonal frequency-division multiplexing (OFDM), being a multi-carrier amplitude and phase modulation technique applied successfully in the latest standards of wireless communications, gives the chance of reliable communication with an acceptable error rate. This paper describes communication tests conducted with the use of a laboratory model of an OFDM data transmission system in a shallow water environment in Wdzydze Lake.

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A method for testing the wide-sense stationary uncorrelated scattering assumption fulfillment for an underwater acoustic channel

Cited by 5 publications

References 8 publications

Assessment of Wide-Sense Stationarity of an Underwater Acoustic Channel Based on a Pseudo-Random Binary Sequence Probe Signal

Assessment of Wide-Sense Stationarity of an Underwater Acoustic Channel Based on a Pseudo-Random Binary Sequence Probe Signal

Archives of Acoustics

Archives of Acoustics

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