Link Budget Analysis
6-32
InterReach Unison Installation, Operation, and Reference Manual
CONFIDENTIAL
D-620003-0-20 Rev J
6.4.4
CDMA Link Budget Analysis for a Microcell Application
Table 6-29
CDMA Link Budget Analysis: Downlink
Line
Downlink
Transmitter
a.
BTS transmit power per traffic channel (dBm)
30.0
b.
Voice activity factor
50%
c.
Composite power (dBm)
40.0
d.
Attenuation between BTS and Unison (dB)
–24
e.
Power per channel into Unison (dBm)
9.0
f.
Composite power into Unison (dBm)
16.0
g.
Unison gain (dB)
0.0
h.
Antenna gain (dBi)
3.0
i.
Radiated power per channel (dBm)
12.0
j.
Composite radiated power (dBm)
19.0
Airlink
k.
Handoff gain (dB)
0.0
l.
Multipath fade margin (dB)
6.0
m.
Log-normal fade margin with 9 dB std. deviation, 95% area cover-
age, 87% edge coverage
10.0
n.
Additional loss (dB)
0.0
o.
Body loss (dB)
3.0
p.
Airlink losses (not including facility path loss)
19.0
Receiver
q.
Mobile noise figure (dB)
7.0
r.
Thermal noise (dBm/Hz)
–174.0
s.
Receiver interference density (dBm/Hz)
–167.0
t.
Information ratio (dB/Hz)
41.6
u.
Required Eb/(N
o
+l
o
)
7.0
v.
Minimum received signal (dBm)
–118.4
w.
Maximum path loss
(dB)
+99.4
