The Hata
model for the urban environment is given as (in the 150 MHz to 1.5G Hz frequency range).
(3.64)
where fc carrier frequency in MHz, hBS is the BS antenna height in units of meters (30200 m),
hMS is the MS antenna height in units of meters (110 m), d is the distance separation in units of
km (120 km), a(hMS) is the correction factor for the MS antenna height.
[44.9 6.55log(hBS)] # log(d)
LUrban
Hata (dB) 69.55 26.16log( fc) 13.82log(hBS) a(hMS)
G(hMS) d10 # logahMS
3 b hMS 3 m
20 # logahMS
3 b 10 m hMS 3 m
G(hBS) 20 # loga hBS
200b hBS 30m
LOkumura(dB) LFS a( f, d) G(hBS) G(hMS) GTerr
LOkumura(dB) LFS a( f, d) GTerr
LFS(dB) 32.4 20 # log(dkm) 20 # log( fMHz)
LFS
PRx
PTx # GTx # GRx
c c
4pdf d2
WIRELESS MULTIPATH CHANNEL 151
For small- to medium-sized cities the MS antenna height correction factor becomes.
(3.65)
Also for large cities the MS antenna height correction is given by
(3.66)
Next, to obtain the path loss in a suburban environment, we first start with the path loss for the urban
environment and then add an adjustment parameter
(3.67)
This approach can also be applied to the open area environment as is given as
(3.68)
The Hata model predicts the path loss relatively close to not only the original Okumura data but
also to some other models used [7].
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