User's Guide

Link Budget Analysis
6-28 InterReach Fusion Installation, Operation, and Reference Manual
CONFIDENTIAL D-620610-0-20 Rev B
6.6.2 Narrowband Link Budget Analysis for a Microcell Application
• 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
Table 6-20 Narrowband Link Budget Analysis: Downlink
Line Downlink
Transmitter
a. BTS transmit power per carrier (dBm) 33
b. Attenuation between BTS and Fusion (dB) –23
c. Power into Fusion (dBm) 10
d. Fusion 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