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6-27
D-620003-0-20 Rev J
CONFIDENTIAL
Link Budget Analysis
6.4.2
Narrowband Link Budget Analysis for a Microcell Application
Table 6-25
Narrowband Link Budget Analysis: Downlink
• c = a + b
• f = c + d + e
• j = g + h + i
• n = k + l + m
• k: in this example, k represents the thermal noise for a TDMA signal, which
has a bandwidth of 30 kHz
• p = f – j – n
Line
Downlink
Transmitter
a.
BTS transmit power per carrier (dBm)
33
b.
Attenuation between BTS and Unison (dB)
–23
c.
Power into Unison (dBm)
10
d.
Unison gain (dB)
0
e.
Antenna gain (dBi)
3
f.
Radiated power per carrier (dBm)
13
Airlink
g.
Multipath fade margin (dB)
6
h.
Log-normal fade margin with 9 dB std. deviation, 95% area coverage,
87% edge coverage
10
i.
Body loss (dB)
3
j.
Airlink losses (not including facility path loss)
19
Receiver
k.
Thermal noise (dBm/30 kHz)
–129
l.
Mobile noise figure (dB)
7
m.
Required C/I ratio (dB)
17
n.
Minimum received signal (dBm)
–105
p.
Maximum path loss
(dB)
+99
