Point-to-point Lee model
The Lee model for point-to-point mode is a radio propagation model that operates around 900 MHz. Built as two different modes, this model includes an adjustment factor that can be adjusted to make the model more flexible to different regions of propagation. Applicable to/under conditions. This model is suitable for using in data collected in a specific area for point-to-point links. Coverage. Frequency: 900 MHz band Mathematical formulation. The model. The Lee model for point to point mode is formally expressed as: formula_1 where, "L" = The median path loss . Unit: decibel (dB) "L" = The reference path loss along 1 km. Unit: decibel (dB) formula_2 = The slope of the path loss curve. Unit: decibels per decade "d" = The distance on which the path loss is to be calculated. Unit: kilometer (km) "F" = Adjustment factor. "H" = Effective height of terrain. Unit: meter(m) Calculation of reference path loss. The reference path loss is usually computed along a 1 km or 1 mi link. Any other suitable length of path can be chosen based on the applications. formula_3 where, "G" = Base station antenna gain. Unit: Decibel with  respect to isotropic antenna (dBi) formula_4 = Wavelength. Unit: meter (m). G = Mobile station antenna gain. Unit: decibel with respect to isotropic antenna (dBi). Calculation of adjustment factors. The adjustment factor is calculated as: formula_5 where, "F" = Base station antenna height correction factor. "F" = Base station antenna gain correction factor. "F" = Mobile station antenna height correction factor. "F" = Mobile station antenna gain correction factor. "F" = Frequency correction factor The base station antenna height correction factor. formula_6 where, h = Base station antenna height. Unit: meter. The base station antenna gain correction factor. formula_7 where , "G" = Base station antenna gain. Unit: decibel with respect to half-wave dipole (dBd) The mobile station antenna height correction factor. formula_8 where, "h" = Mobile station antenna height. Unit: meter. The mobile antenna gain correction factor. formula_9 where, G = Mobile station antenna gain. Unit:Decibel with respect to half wave dipole antenna (dBd). The frequency correction factor. formula_10 where, "f" = Frequency. Unit: megahertz (MHz) Effective terrain slope calculation. This is computed in the following way: