User Manual

DELTANODE FIBER DAS MANUAL
©DeltaNode Solutions 2012
32
Revision 12-03
Fiber DAS thermal noise floor
-121,0
dBm
Noise figure DAS link
3,0
dB
Number of equal links
3,0
pcs
System net gain
0,0
dB
If your noise load is high you should lower this
DAS Noise result
-118,0
dBm
Noise load on BTS with DAS
-115,0
dBm
Desensitization on BTS
3,0
dB
New BTS Sensitivity
-106,0
dBm
Loss from BTS to remote antenna
7,0
dB
Sensitivity at remote antenna
-99,0
dB
Fading margin
6,0
db
Penetration loss
0,0
dB
Antenna gain MS
1,0
Body loss MS
5,0
Required signal level
-89,0
MS Output power
30,0
dBm
For 900 use 33 dBm for 18/1900 bands use 30
Allowed path loss from MS to antenna
119,0
dB
Balance downlink-uplink
-3,0
dB
This should preferably be +/- 5 dB
Radiating cable coupling loss C95
70,0
dB
Only when using radiating cable
Loss per 100 m
4,0
dB
Only when using radiating cable
Maximum length of radiating cable
1224,5
m
Table 13: Link budget downlink
Example WCDMA link budget
WCDMA LINK BUDGET
RECEIVER SENSITIVITY AND NOISE
Noise floor
-108,2
dBm
Receiver NF
6,0
dB
RX noise power
-102,2
dBm
Interference margin
3,0
dB
RX interference power
-102,2
dBm
Noise plus interference power
-99,2
dBm
Requested bit rate
64,0
kbit
Video call = 64, voice = 12,2
Gross bit rate
3840,0
kbit
Process gain
17,8
dB
Required Eb/No
5,0
dB
Fast fading margin
4,0
dB
Receiver sensitivity
-107,9
dBm
DOWNLINK CALCULATION
Output power DAS remote unit
30,0
dBm
Number of carriers
1,0
pcs
This gives the per carrier power
Power per carrier
30,0
dBm
Splitloss from RU port to last antenna
6,0
dB
Cable losses
4,0
dB
DAS antenna gain
3,0
dB
EIRP
23,0
dBm
MS Antenna gain
5,0
MS Body loss
3,0
MS Minumum level
-109,9
dBm
Allowed pathloss
137,9
dB
UPLINK CALCULATION
Output power of MS
21
dBm
Maximum power
Antenna gain MS
5,0
dB
Body loss MS
3,0
dB