Page 193 - Integrated Wireless Propagation Models

I
M a c r o c e I P r e d i c t i o n M o d e I s - P a r t 2 : P o i n t - t o - P o i n t M o d e I s lTI

Mobile blocked by a knife

Retrieve terrain radial and find the knife edge
/ Knife edge
K
�

Calculate
gain and
loss
K
K
l 1h.�h·� �?11���
h
he n e2 ,/ / Calculate ga1ns,
T
/
/ / effh1 , effh 2 , ,effhn
/
y [ / up to the kn1fe

v , -2.4 and V ,; -1
Diff loss ,- - - - - - ---::- 2
Case of V >-----� = 20iog1o(o.4-V o. 1 1 84 - (o. 1 v + o.38) )

y y
Add gain Subtract loss l
T
Generic signal = E rp--PL �� Adj ust signal for antenna height,
I · transm1tter power, d1rect1onal r--..., L__ Final predicted signal
+ Max effh gain _ diff loss
.
ga1n, and frequency
_j
_
_
_
_
_
_
FIGURE 3.3.2.2.1 Single-knife-edge algorith .
m
effective antenna gain added into the new algorithm provides a slight and unnoticeable
improvement. Therefore, the original prediction method should be used:
Signal = ERP- PL + Max 2 00fi (e ffh)gain 1knife -DiffLoss knife
1
hrj
Max
+ i :/ 2 000fi [ .J gain-DiffLossKnife) (3.3.3.1)
h
j= z \ PPJ