User's Guide

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D-620610-0-20 Rev B CONFIDENTIAL
Link Budget Analysis
• e: enter the noise figure and gain of each system component (a, b, c, and d) into
the standard cascaded noise figure formula
• i = f + e + g – h
• m = j + k + l
• p = n – m – i
Therefore, the system is downlink limited but the downlink and uplink are almost
balanced, which is a desirable condition.
Table 6-21 Narrowband Link Budget Analysis: Uplink
Line Uplink
Receiver
a. BTS noise figure (dB) 4
b. Attenuation between BTS and Fusion (dB) –10
c. Fusion gain (dB) 0
d. Fusion noise figure (dB) 1-4-32 22
e. System noise figure (dB) 22.6
f. Thermal noise (dBm/30 kHz) –129
g. Required C/I ratio (dB) 12
h. Antenna gain (dBi) 3
i. Receive sensitivity (dBm) –97.4
Airlink
j. Multipath fade margin (dB) 6
k. Log-normal fade margin with 9 dB std. deviation, 95% area coverage,
87% edge coverage
10
l. Body loss (dB) 3
m. Airlink losses (not including facility path loss) 19
Transmitter
n. Mobile transmit power (dBm) 28
p. Maximum path loss (dB) 106.4
F
sys
= F
1
+ + + ....
F
2
– 1
G
1
F
3
– 1
G
1
G
2
where
F = 10
(See Rappaport, Theodore S. Wireless Communications, Principles, and Practice. Prentice Hall PTR, 1996.)
(Noise Figure/10)
G = 10
(Gain/10)