Hashemi [25] had showed there is a linear dependence (over a region considered)
between RMS and path loss and is supported in Figs. 3.28 and 3.29.
WIRELESS MULTIPATH CHANNEL 139
Relationship between RMS Delay Spread and
Path Loss 900 MHz to 1.3 GHz
0
10
20
30
40
40 50 60 70 80 90 100 110
Path Loss (dB)
RMS Delay Spread (nsec)
Building B
Building A
Relationship between RMS Delay Spread and
Path Loss 900 MHz to 1.3 GHz
0
50
100
150
200
250
300
350
40 50 60 70 80 90 100 110
Path Loss (dB)
RMS Delay Spread (nsec)
Building B
Building A
Residential
FIGURE 3.29 Delay spread and path loss relationship.
FIGURE 3.28 Delay spread and path loss relationship.
The above results were taken in Canada. Here we see as RMS decreases, the path loss also
decreased. Now since path loss is a function of antenna separation, one can also conclude that for
these particular set of measurement that RMS is indeed a function of distance. It is worth mentioning
that there have also been measurements made where this argument is not supported. Here reports have
been made stating delay spread was not correlated with distance.
It was also shown that a relationship other than linear exists between the path loss and RMS delay
spread, see Fig.
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