Analytical model of non-line-of-sight single-scatter propagation

Abstract

An analytical model of non-line-of-sight (NLOS) single-scatter propagation is presented that has no integral form and is intended for performance analysis and system design of NLOS UV communication. Based on isotropic scattering and a continuous wave transmitter, the analytical model is verified by the current NLOS single-scatter propagation model, with consistent results. Several rules concerning NLOS UV communication are put forward on the basis of this analytical model, which are shown as follows: on condition that the minimum single-scatter optical depth is less than 0.1, the path loss factor should be 1; to maintain the NLOS UV communication link, the transmitter needs to radiate neither a continuous wave nor a huge pulse but a low-power wave whose duration is approximately the duration of impulse response; the "best" extinction coefficient is approximately the inverse ratio of the efficient single-scatter range; on condition that the radiation intensity of the transmitter is fixed, the half field of views (FOVs) are positive factors, while the elevation angles are negative factors; on condition that the power of the transmitter is fixed, the conclusions mentioned above remain valid with the exception that the half FOV of the transmitter is a negative factor. These rules also apply to anisotropic scattering.

Closed-form path loss model of non-line-of-sight ultraviolet single-scatter propagation

“…Reference [5] extended the model for the case where both the Tx beam and the Rx FOV are above the horizontal plane in which the Tx and Rx lie, and [6] further extended it for arbitrary Tx and Rx orientations. For tractable analysis, [7] simplified the integral-form model of [2] to a closed-form model by assuming isotropic scattering and a continuous wave Tx. Reference [8] proposed a closed-form approximation by considering the coplanar case where the intersected volume of the Tx beam and the Rx FOV is small, and [9] extended it for noncoplanar geometries.…”

Characteristics of non-line-of-sight polarization ultraviolet communication channels

“…This extended model is mostly used as a "standard" model by which other similar models are validated. Xu et al and Yin et al deduced some simplified single-scatter equations in coplanar geometry, but they were unable to evaluate temporal characteristics [3,10]. Wang et al and Elshimy and Hranilovic extended the NLOS single-scatter propagation model from coplanar geometry to noncoplanar geometry [11,12].…”

Extending the data rate of non-line-of-sight UV communication with polarization modulation

“…Research on NLOS UV communication dates back to 1968 3 , and receives broad recognitions recently because of the maturation of semiconductor UV light source and UV detector. Several scattering propagation models have been presented [4][5][6][7][8][9] , which can be made use of for signal evaluation and system design of UV communication systems. And also several UV communication systems have been presented [10][11][12][13][14] , it is expectable that UV communication works for the humans' needs in the near future.…”