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D-620616-0-20 Rev G CONFIDENTIAL
Link Budget Analysis
6.6.2 Narrowband Link Budget Analysis for a Microcell Application
Table 6-31 Narrowband Link Budget Analysis: Downlink
Line Downlink
Transmitter
a. BTS transmit power per carrier (dBm) 33
b. Attenuation between BTS and Fusion Wideband (dB) –23
c. Power into Fusion Wideband (dBm) 10
d. Fusion Wideband 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
• 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