To improve the prediction accuracy of diffraction loss
, the proposed method uses ignored edges in the Bullington method to calculate additive diffraction losses
Our proposed model is a deterministic model, a terrain model which computes path loss based on the diffraction loss
of multiple knife-edge obstructions using the Epstein-Peterson path geometry method , Fresnel-Kirchhoff's theory, and FSL.
Lmsd gives diffraction loss
as a result of multiple obstacles.
Chong, "Research and simulation of signal diffraction loss
based on UTD theory", in 5th Int.
It is noted that larger knife-edge diffraction loss
[L.sub.kf] can be introduced by a higher value of v which is proportional to the effective height h of an obstruction ship.
Propagation through loss with the added diffraction loss
is shown in Figs.
Moreover, some physical insights have been discussed on the origin of the diffraction loss
in the TIR facets.
Knife-edge diffraction loss
is then determined from the homograph in Figure 4.
For the radiation present at a given wavelength [lambda] the diffraction loss
can be described in terms of a unit-less parameter, v = 2[pi][PSI]R/[lambda].
But unlike the case of open-sea, the influence of the obstacles near the inland river (e.g., diffraction loss
caused by some large bridges) and mixed-path effect cannot be neglected.
When radio-wave transmitting under urban microcell, diffraction loss
is so much more than reflection loss generally that it is quite necessary to distinguish reflection and diffraction using the type weight of the ray.