D-51149 Köln, 28 August 2013
Date issued:
18. June 2013
Source:
Telefonica Germany
Subject:
Simulation of potential interference from LTE800 DL to DVB-T &
determination of eNB OOBE level – real case
The following situation is considered:
Address of the victim Receiver (DVB-T): Neufamer Str. 27 85646 Purfing
Interferer:
O2 LTE eNB=510322127A Sector2=160°, Ant High=7,2m Ant = K 800 10634_6_L, Clutter=rural
LTE800 DL=796MHz BW=10MHz (E-UTRA Band 20) , P = 46dBm (MIMO=no),
LTE BS SEM according ETSI TS 136 104
DVB-T Transmitter:
Olympiaturm (propability): Ant High=290m, Channel=60 not present. Highest Channel is Channel=56 .
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Channel 56 -> Fm = 754MHz BW = 8MHz.
Modulation = 16-QAM FEC=2/3 POL=V, Perp=100kW Antenna= ND=Omni
DVB-T Receiver:
Noise Figure = 7dB, Pnoise = 10 log10(kTB)+NZ=98.17dBm.
Receiver minimum SINR=21dB. Ant High=10m, Antenna Gain=9.15dBi BW= 7,6MHz
Distance TX to RX ca 22km (VSL)
Distance Interfering Link ca 75m (Sektor2=160° is considered)
Modeled Scenario (real case)
Victim System Link DVB-T
System
Victim system Link
Power [dBm] EIRP
Distance
22km
82,15
Frequenz [MHz]
754
Ch BW [MHz]
8
DVB-T 64QAM, 2/3FEC
Rx Ant Höhe [m]
10
DVB-T TX Ant Höhe [m]
Azimut
0
270-290
Grx [dBi]
9,15
Propagation Model
ITU-R P1546 4 land
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Elevation
0
Noise Floor [dBm] *
-98,2
C/N [dB] *
C/I [dB]
C/(N+I) [dB] *
N+I/N [dB]
I/N [dB]
Sensitivity [dBm]
-74
26,2
24
21
3
0
Reception BW [kHz] * Mode
7600
Protection
The ‘Mugler Filter’ (LTE787) was also introduced in the Receiver Path. The Filter response
has a minimum additional Attenuation from 15dB at the adjacent channel lower edge. The
Mask B includes the impact of this filter.
Blocking Mask A* DVB-T BW=8MHz
Receiver Blocking Mask B with ‘Mugler Filter’
DVB-T receiver mask *
The DVB-T receiver Mask used from the Orange Seamcat study CPG-15 PTD#3, where the ACS values
based on the Project Group: CPG-PTD(13)024[2] :
Frequency offset (MHz)
1/(10)
2 (18)
3 (26)
4 (34)
5 (42)
6 (50)
7 (58)
8 (66)
9 (74)
ACS (dB)
46
51
54
56
57
60
60
60
60
DVB-T Mask values (50% percentile, 1 Mbit/s UE loading, as a first approach).
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Interference Link LTE800 DL
System
Distance
Frequenz [MHz]
Ch BW [MHz]
Interference Link
ca 90m (fix)
Power [dBm]
46
LTE TX Ant Höhe [m]
7,2
Gtx [dBi]
15
Elevation
-2
Propagation Model
Free Space ITU-R 525 / (Extended Hata SRD)
796
10
LTE800 BEM (Block Edge Mask)
The Block Edge Mask is considered to determine the OoB or spurious emissions limits in adjacent
frequency blocks. Here, it is given for the Telefonica frequency spectrum range.
BEM derivated for the Telefonica Germany Frequency Range according ECC Recommendations
60
BEM EC C/REC/(09)03
60
790791
P [dBm/MHz}
40
y
20
13.
0
DVB  T
 10
780
785
790
780
795
800
805
x
f [MHz]
810
815
816
BEM for Telefonica Frequency range refered to 1 MHz Bandwith
In this study it is done for the OoB Limits of 22dBm/8MHz if TV Channel=60 is not present and second
for 0dBm/8Mhz if TV Channel=60 is present.
BEM Block Edge Mask based on 'Präsidenten Kammer Entscheidung'
OoB Scenario
limit
Unwanted/Probability C/(I+N) Dictance
[dBm/8MHz]
[%] δ=6,5dB
[dB]
IL [m]
Channel 60 not present
22
95,43
21
<100
Channel 60 present
0
4,98
21
<100
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To get the Transmitter Standards for the LTE BS it is carry out via the 3GPP TS 36.104 version 11.2.0
Release 11. See Technical Specification from ETSI TS 136 104 V11-2.0 report.
Spectrum Emission Mask according ETSI TS 136 104 for E-UTRA Band 20 see Table 2:
LTE800 BS SEM used by this study:
Mask based on ETSI TS 136 104 LTE eNB = 46dBm/10MHz transmit power
∆f OoB
[MHz}
limit refBW [dBm]
refBW
[kHz]
limit SystemBW
[dBm]
Mask
[dBc]
0 …5
-7
100
13
-33
5,1 … 10
-14
100
6
-40
10,1…10,2
10,2 …60
-16
-36
100
100
4
-16
-42
-62
Table 2: SEM LTE800 BS DL ETSI TS 136 104
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Propagation Models:
For he DVB-T link VLT (Victim Link Transceiver) to VLR (Victim Link Receiver) the ITU-R P1546 4 land
rural Model is used for pass loss calculation. The Standard-Deviation is around δ=4dB.
The Interference Link was modeled with the free space (as worst case) and Extended Hata SRD as it is
optimized for short range distance ( here app. 100m)
The following diagram shows the difference between the used Propagation models. The Pathloss in
all cases was calculated for 100m.
The red curve is the free space with δ=1dB. The blue line represents the ITU 1546 - and the green one
the Extended Hata - Model . The pathloss was in all cases calculated for 100m and 800MHz.
As it is well known, that the measurement (by BNetzA) of this constellation does’nt determine any
significant Interference, this study can be pictured as a worst case scenario. Apart from that a so
called ‘Mugler Filter’ was introduced which has a positive impact to the Blocking effect (see
simulation results).
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Simulation Results:
BS OOBE
-15 dBm/8MHz
EIRP
5 dBm/8MHz
EIRP
C/(N+I)=21
dB*
RX Blocking with
TV Channel
Mugler Filter
54
TX-RX Azimut
Rx Blocking
-
-
-
2,49%
160°
14,53%
0,04%
56
84,64%
160°
76,69%
5,29%
60
It should be noted, that this study was reviewed. The result obtained was slightly higher (e.g. 22%)
than it is shown here. There are several reasons for the difference:
1. It is refered to an other Interference criteria C/I= 24 dB
2. Different propagation models where under investigations.
It has to be taken into account, that the used propagation model and with it connected, the Standard
Deviation has a significant influence to the simulation results. Therefore the choosen
Model(s) should cover the considered situation as best as possible.
This study was reviewed by Karl Koch from the BNetzA. I want stating a special Thanks to him
for his super support . He has a big share to this study.
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Conclusion:
As the highest Channel in the considered area is Channel=56, which has more than 40MHz
gap to the LTE Transmitter, the impact to the DVB-Receiver should be very low.
Thus, this study determine a low influence to the DVB-T Receiver.
From an other point of view when looking without going to the BS Standards e.g. the BEM, than it
can be recognized that the there is a high impact to the DVB-T receiver. But it is even reasonable
because there is a quit small DVB-T Level like app. 41,2dBµV/m plus C/(I+N). Therefore the
unwanted level indicates a high interference probability.
The situation change if Channel=60 is under investigation. In this case the impact to the
Receiver rise and some interference can’t be overlooked.
Additionally it is shown, that the ‘Mugler Filter’ has a significant impact to the Interference
Probability seen by the Blocking Level.
References:
-
-
*CPG-PTD(13)059_Orange_Simulations of potential interference from LTE UE to DVB-T
**CEPT Report 30
ETSI TS 136 104
STG WS(13)05 Setting unwanted-blocking-overloading
ECC Report FM22(12)09 Block Edge Mask measurements at LTE800 base stations
‘Mugler Filter’ Data and Characteristics by Dr. P.Gräf
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ATTACHMENT:
LTE787 Filter characteristics:
LTE787
0
-10
760
780
800
820
840
860
880
-20
-30
LTE787
-40
-50
-60
BEM Table refered to 1MHz:
Block Edge Mask BEM
f / MHz
780.00
786.00
790.00
790.10
791.00
791.10
796.00
801.00
801.10
806.00
806.00
811.00
P / dBm
-9.00
-9.00
-9.00
17.00
17.00
50.00
50.00
50.00
15.00
15.00
11.00
9.00
Ref BW / kHz
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
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