The Lee model for area-to-area 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.
This model is suitable for using in data collected. The model predicts the behaviour of all links that has ends in specific areas.
900 MHz band
The Lee model is formally expressed as:
L = L0 + \gammalogd -10log{FA}
where,
L = The median path loss. Unit: decibel (dB)
L0 = The reference path loss along 1 km. Unit: decibel (dB)
\gamma
d = The distance on which the path loss is to be calculated.
FA = Adjustment factor.
The reference path loss is usually computed along a 1 km or 1 mile link. Any other suitable length of path can be chosen based on the applications.
L0 = GB + GM + 20 (logλ - logd) - 22
where,
GB = Base station antenna gain. Unit: decibel with respect to isotropic antenna (dBi)
λ
GM = Mobile station antenna gain. Unit: decibel with respect to isotropic antenna (dBi).
The adjustment factor is calculated as:
FA = FBH FBG FMH FMG FF
where,
FBH = Base station antenna height correction factor.
FBG = Base station antenna gain correction factor.
FMH = Mobile station antenna height correction factor.
FMG = Mobile station antenna gain correction factor.
FF = Frequency correction factor
FBH = \left(
hB | |
30.48 |
\right)2
where,
hB = Base-station antenna height. Unit: meter (m).
or
FBH = \left(
hB | |
100 |
\right)2
where,
hB = Base-station antenna height. Unit: foot (ft).
FBG =
GB | |
4 |
where,
GB = Base-station antenna gain. Unit: decibel with respect to half wave dipole antenna (dBd)
FMH = \begin{cases}
hM | |
3 |
if,hM>3\ (
hM | |
3 |
)2if,hM\le3\end{cases}
where,
hM = Mobile-station antenna height. Unit: meter(m).
FMG = GM
where,
GM = Mobile-station antenna gain. Unit: Decibel with respect to half wave dipole antenna (dBd).
FF = (
f | |
900 |
)-nfor2<n<3
where,
f = Frequency. Unit: megahertz (MHz)