Dual-Band Digital Optical Repeater
DW-010-7373-08
Installation & Operation Manual -
Preliminary
Dali Wireless
Proprietary and Confidential
37
Rev: 0-2
Feb 2011
0
5.3.1 UL Signal Nose Level and Gain Calculation
This section provides calculation for a maximum allowed UL noise level that DOR, containing one DAU and one
or more DRUs operating on the same channel (simulcast), can add to the Base Station noise level. Base station
noise level degradation due to the DOR connection to the system is limited to 1 dB. The maximum allowed DOR
noise level determines the maximum
Gain
on the main UL and Diversity UL path.
a. Without DOR, Base Station up link Rx noise level (bandwidth B = 200KHz, Noise Figure
NF_bs = 4
dB
) is:
NP_bs = 10*log(KTB) + NF_bs
= -121 dBm + 4dB
= -117 dBm
(1)
b. DOR uplink output noise level (DOR noise figure
NF_dor = 5 dB
, uplink gain is
G
) is:
NP_dor = 10*log(KTB) + G
= -121 dBm + 5 dB + G
= -116 dBm + G
(2)
c. The RF components (coupler, attenuators, cables) between Base Station and the DOR will add a
loss of
L
, the uplink noise at the Base Station RX input will be:
NP_total = NP_bs + (NP_dor - L)
= -117 dBm + (-116 dBm + G – L)
(3)
d. Normally, NP_total must be less than -116 dBm. That means the noise level increase by 1 dB due to
the introduction of DOR system.
e. According to (3), (NP_dor – L) must be less than -123 dBm.
The
(G – L)
must be less than -7 dB.
f. For a DOR system with 2 DRU,
(G – L)
must be less than (-7 – 10log2) = -10 dB.
g. For a DOR system with N DRU,
(G – L)
must be less than (-7 – 10logN).
Table 5-1 UL Gain Calculation Example
Table 5-1 provides Gain calculation example for BS/DAU path loss of 33 and 43 dB.
# of Simulcast
DRUs
G - L [dB]
G [dB] for
L=33dB
G [dB] for
L=43dB
1
-7.0
26.0
36.0
2
-10.0
23.0
33.0
3
-11.8
21.2
31.2
4
-13.0
20.0
30.0
5
-14.0
19.0
29.0
6
-14.8
18.2
28.2
CommScope v. Dali Wireless
IPR2020-01409
DALI WIRELESS Exhibit 2003
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