Wireless Sensor Networks for Off-shore Oil and Gas Installations

2014 IEEE Fifth International Conference on Communications and Electronics (ICCE)

Zajić

2014

This paper develops a stochastic geometry based channel model for wideband single-input single-output (SISO) shallow underwater acoustic (UWA) channels under the assumption that the ocean surface and bottom are rough. Starting from a geometrical model, we derive a reference model assuming that the scatterers are randomly distributed on the surface and the bottom of the water. The probability density functions (PDFs) of the angle-of-departure (AOD) and the angle-of-arrival (AOA) of the reference model are analyzed. Furthermore, the two-dimensional (2D) time-frequency correlation function (T-FCF) of the reference model is studied. From the reference model, we then derive the corresponding simulation model by applying the generalized concept of deterministic channel modelling. For the parametrization of the UWA channel simulator, we propose a new method which is further on called the method of equally spaced scatterers (MESS). The performance of the MESS is compared with that of the Lp-norm method (LPNM). It is shown that our design concept results in an excellent match between the T-FCF of the reference model and that of the simulation model. It is also shown that both the MESS and the LPNM have a similar performance, whereby the MESS provides a closed-form solution, while the LPNM does not.

Section: Introductionmentioning

confidence: 99%

A geometry-based channel model for shallow underwater acoustic channels under rough surface and bottom scattering conditions

Naderi

2014 IEEE Fifth International Conference on Communications and Electronics (ICCE)

Zajić

2014

“…The functions A s (·) and A a (·) introduced in the gain c 0 [see (3)] denote the propagation loss coefficients due to spherical spreading and absorbtion, respectively. We assume that the transmitter is equipped with an omnidirectional hydrophone, which generates spherical waveforms in the isovelocity environment.…”

Section: A Tvcirmentioning

confidence: 99%

“…UWA networks have been studied in various areas due to their potential applications in oceanography that involve the exploration of the ocean [1], support for underwater robots [2], offshore oil industry exploration [3], and pollution monitoring [4], just to name a few examples. Owing to the fact that electromagnetic waves and laser beams suffer from high path loss in ocean water, acoustic signals are being used, especially, in mediumand long-range underwater communications.…”

Section: Introductionmentioning

confidence: 99%

A Geometry-Based Underwater Acoustic Channel Model Allowing for Sloped Ocean Bottom Conditions

Naderi

IEEE Trans. Wireless Commun.

Hicheri

et al. 2017

Abstract-This paper proposes a new geometry-based channel model for shallow-water ocean environments in which the ocean bottom can slope gently down/up. The need for developing such an underwater acoustic (UWA) channel model is driven by the fact that the standard assumption of a flat ocean bottom does not hold in many realistic scenarios. Starting from a geometrical model, we develop a stochastic channel model for wideband single-input single-output vehicle-to-vehicle UWA channels using the ray theory assuming smooth ocean surface and bottom. We investigate the effect of the ocean-bottom slope angle on the distribution of the channel envelope, instantaneous channel capacity, temporal autocorrelation function, frequency correlation function, Doppler power spectral density, and the power delay profile. Theoretical and simulation results show that even a relatively small slope angle influences considerably the statistical properties of UWA channels. The validation of the proposed UWA channel model has been performed by fitting its main characteristic quantities (average delay, delay spread, and coherence bandwidth) to measurement data. In comparison with the conventional UWA channel model, which has been developed on the assumption of a flat ocean bottom, it is shown that the proposed UWA channel model enables the modelling of measured channels with higher precision.

“…Examples of such applications include remote control in offshore oil industry, pollution monitoring, collection of scientific data recorded on the ocean floor, and communication between underwater vehicles [2], [3]. The UWAC channel is one of the most challenging wireless communication media.…”

Section: Introductionmentioning

confidence: 99%

A study on the distribution of the envelope and the capacity of underwater acoustic channels

Hicheri

2014 IEEE International Conference on Communication Systems

Talha

et al. 2014

This paper deals with the statistical analysis of the instantaneous capacity of shallow underwater acoustic communication (UWAC) channels under the assumption that the scatterers are randomly distributed on the surface and bottom of the ocean. We start by deriving exact closed-form expressions for the probability density function (PDF) of the total propagation path length from which the PDF of the path gains is obtained. Then, we study the distributions of the channel envelope and the capacity under line-of-sight (LOS) conditions. By performing the chi-square goodness-of-fit test, it is shown that the channel envelope is Rice distributed. Moreover, we investigate the effect of the ocean depth as well as the distance between the transmit and receive hydrophones on the investigated statistical quantities. The correctness of the derived closed-form expressions is confirmed by computer simulations.978-1-4799-5832-0/14/$31.00 ©2014 IEEE 394