User's Manual

5-32 InterReach Unison Accel Installation, Operation, and Reference Manual PN 9000-10
620021-0 Rev. A
5.4.2 Narrowband Link Budget Analysis for a Microcell Application
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 8 dB std. deviation, edge reliability 90%
(dB)
11
i. Body loss (dB) 3
j. Airlink losses (not including facility path loss) 20
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) –98