7
0.8
0.9
1
0 500 1000 1500 2000 2500 3000
Delay Spread (nsec)
CDF
Small
Delay
Spread
Medium
Delay
Spread
A B C D E F
G H I J K L
Outdoor Delay Spread Measurements Summary
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 2000 4000 6000 8000 10000
Delay Spread (nsec)
CDF
Area I
Area II
A B D E F H I J
K L M N O P Q
FIGURE 3.37 Summary of outdoor propagation measurements.
FIGURE 3.38 Additional summary of outdoor propagation measurements.
These measurements include some mountainous environments. We can easily see the mountainous
regions approached the 10 sec point. The results presented were taken from the following references:
[74??“88]
As discussed above no attempt was made to normalize the data since it was measured in widely varying
environments and countries, not to mention measurement test setups as well. Having said this, we
can see there are a least two areas/sections that deserve special attention. Specifically areas I and II can
correspond to urban/suburban and mountainous. The mountainous section shows RMS as much as
10 sec. Where as the other section clearly shows an overlap between the urban and suburban environments.
In fact, this can also be seen in the [73] reference. A closer look can reveal section I can be
split up into two parts: A and B, where B can be associated with possibly urban and macrocellular cell
sizes.
Pages:
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241