User's Manual

Designing an LGCell Solution
7-34 LGCell 4.0 Installation, Operation, and Reference Manual PN 8100-40
620004-0 Rev. B
7.4.2 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 LGCell (dB) –30
c. Power into LGCell (dBm) 3
d. LGCell gain (dB) 0
e. Antenna gain (dBi) 3
f. Radiated power per carrier (dBm) 6
Airlink
g. Multipath fade margin (dB) 6
h. Log-normal fade margin with 8 dB std. deviation, edge reliability 90%
(dB)
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) 12
n. Minimum received signal (dBm) –110
p. Maximum path loss (dB) 97