The following measurements were taken in a university in the United Kingdom [24].
It was shown from these two plots how the delay spread decreases as the carrier frequency
increases. As we will show later in this chapter, the higher frequencies have larger propagation path
loss, and thus for the same cell size more path loss occurs.
136 CHAPTER THREE
Example of Indoor Power Delay Profile (PDP)
??“50
??“40
??“30
??“20
??“10
0
0 50 100 150 200 250
Excess Delay (nsec)
Power (dB)
FIGURE 3.2 Example of a measured indoor PDP.
TABLE 3.1 Comparison of Delay Spread Values
for 900 MHz and 1.9 GHz Frequency Bands
Delay spread LOS NLOS
RMS 100 nsec 300 nsec
Indoor RMS Delay Spread
0.0
0.2
0.4
0.6
0.8
1.0
30 35 40 45 50 55 60 65 70
RMS Delay Spread (nsec)
CDF (% < Abscissa)
I6 ??“ 850 MHz/1.7 GHz
Indoor RMS Delay Spread
0
0.2
0.4
0.6
0.8
1
0 25 50 75 100 125
RMS Delay Spread (nsec)
CDF (% < Abscissa)
I
J
Indoor RMS Delay Spread
0
0.2
0.4
0.6
0.8
1
0 5 10 15 20 25 30 35
RMS Delay Spread (nsec)
CDF (% < Abscissa)
17 GHz
5 GHz
2 GHz
FIGURE 3.25 Indoor delay spread statistics for measurements
made in the United Kingdom.
FIGURE 3.24 Indoor delay spread statistics for some measurements made in Canada.
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