1. Basic examples of setting simulations
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2. Outline How is the dRSS calculated? How is the iRSS calculated?
How to calculate the Probability of interference?
Jukka Rakkolainen/ERO

3. ✓ ✓ ✓ ✓ ✓ Define Victim Link Receiver (VLR)
You will learn how to ... ✓
Define Victim Link Receiver (VLR)
Operating frequency
Receiver bandwidth
Antenna Characteristics
Interference criteria
Noise floor
Define Victim Link Transmitter (VLT)
Tx power
Antenna characteristics
Position the VLT vs VLR ✓ ✓ ✓
Calculate the dRSS
Launch simulation
Extract dRSS vectors ✓

4. SEAMCAT scenario iRSS dRSS Interfering Link Transmitter (ILT) Victim
Link Receiver
(VLR)
Interfering link
Victim link
Victim Link
Transmitter
(VLT)
Interfering Link
Receiver
(ILR)

5. Victim Link dRSS Victim Link Receiver (VLR) Victim link Victim link
Transmitter
(VLT)

6. Define Victim frequency

7. Define Victim Link Receiver (VLR)2 5 1 3 4

8. Define Victim Link Transmitter (VLT)2 3 1

9. Position of the VLT to the VLR (1/2)
Uncorrelated cases mode
User-defined Radius
Correlated cases mode
Correlated distance (origin = VLT)
Noise limited Network
Traffic limited Network
VLT ↔ VLR
location

10. Position of the VLT ... and propagation model Delta X = 2 km y dRSS
Victim Link
Transmitter
(VLT)
Victim
Link Receiver
(VLR)
dRSS
Victim link
(0,0)
(2 km,2 km)
Delta X = 2 km
Delta Y = 2 km x y
... and propagation model

11. Calculation of the dRSS using Free space
L = log(8)+20log(1000))
L = dB
dRSS = Pe+Ge+Gr-L
dRSS = 30(dBm)+9 (dBi)+9 (dBi) (dB)
dRSS = -53.5dBm

12. Launch simulation OR
OR Ctrl + E

13. Extract dRSS Before running the simulation
After running the simulation  simulation results

14. Simulation Outline An overview of results

15. Simulation Results - dRSS
Double click on this line to get the vector
Name of the vector
Unit
Type:
- Vector
- Double
- Integer…

16. Calculation of dRSS dRSS = Pe+Ge+Gr-L
dRSS = 30(dBm)+9 (dBi)+9 (dBi) (dB)
dRSS = dBm

17. Coverage Radius (Position of the VLR to VLT) and (Position of the ILR to ILT)

18. ✓ ✓ ✓ iRSS calculation Define Interfering Link Transmitter (ILT)
You will learn how to ...
Define Interfering Link Transmitter (ILT)
Tx power
Antenna Characteristics
Set the emission bandwidth ✓ ✓
Position the VLR vs ILT (Simulation Radius)
Calculate the iRSS ✓

19. SEAMCAT scenario

20. Interfering Link Create as many interfering links as you need:
Add, Duplicate, Delete, Multiple generation

21. iRSS

22. Interfering Frequency

23. Position of the Victim to Interferer
Simulation radius
Uncorrelated mode
None
(nactive interferers)
ILT /VLR
Correlated mode
ILT /VLT
ILR /VLR
ILR/VLT
Uniform density (nactive interferers)
Closest
(single interferer)
VLR/VLT ↔
ILR/ILT
location

24. Position of the VLR vs ILT
dRSS
Victim link
Transmitter
(VLT)
iRSS
Interfering Link
Transmitter
(ILT)
Victim link
= 4 km
Delta Y
Interfering link
Interfering Link
Receiver
(ILR)
Delta X = 4 km
Victim
Link Receiver
(VLR)

25. iRSS unwanted: co-channel
P(dBm/Bref) = Pe (dBm)+Att(dBc/Bref)
33 (dBm/200KHz) = (dBc/Bref)
iRSS = Pe+Ge+Gr-L
iRSS = 33(dBm)+11 (dBi)+9 (dBi)-( log(32)+20log(1000))
iRSS = -54.5dBm

26. Modify the SEM Change the ILT frequency to 1000.3 MHz
Change the SEM as follow:
P = 33 +(–23(dBc/Bref)) = 10 (dBm/200kHz)

27. iRSS unwanted: adjacent channel
iRSS unwanted calculate the interfering power received by the Victim receiver within its bandwidth
iRSSunwanted = P+Ge+Gr-L
iRSSunwanted = 10(dBm/200kHz)+11+9-( log(32)+20log(1000))
iRSSunwanted = -77.5dBm
Unwanted:
fVr
fIt
Interfering
emission mask
Rx bandwidth
In this example there is no bandwidth correction factor to be applied to the calculation of the iRSS unwanted since the Vr bandwidth and the It reference bandwidth have the same value (i.e. 200 KHz).

28. Simulation Radius (Position of the VLR to ILT)

29. Calculate iRSS blocking
Change the blocking mask as follow:
fVLR
fILT

30. User-define Mode
The It bandwidth is not considered in the iRSS blocking calculation)
User-defined mode:
iRSS blocking (fit) = Pe+Ge+Gr-L-Att (fit)
iRSS blocking = 33(dBm)+11+9-( log(32)+20log(1000))-40(dB)
iRSS blocking = -94.5dBm
Blocking:
fVr
Receiver Mask
fIt
Rx bandwidth
Rejection
of the receiver

31. Sensitivity Mode Sensitivity mode:
Attenuation(f) = block(f) [dBm] – sensvr [dBm] + C/(N+I) [dB] - I/N [dB]
Sensitivity = sensvr = Noise Floor + C/(N+I)
sensvr = -110dBm + 16
= -94dBm
Attenuation (f ) = 40-(-94)+16-0= 150dB
iRSS blocking (Fit) = Pe+Ge+Gr-L-Att (Fit)
iRSS blocking =
= dBm

32. Protection Ratio Protection Ratio:
Attenuation(f) = block(f) [dBm] + C/(N+I) [dB] + (N+I)/N [dB] - I/N [dB]
Attenuation(f) = = 59 dB
iRSS blocking (fit) = Pe+Ge+Gr-L-Att (fit)
iRSS blocking =
= dBm

33. Probability of interference
You will learn how to ... ✓
Extract the Probability of Interference in .... ✓
Compatibility calculation mode ✓
Translation calculation mode

34. Probability of interference
Calculation mode: compatibility or translation
Which type of interference signal is considered for calculation: unwanted, blocking, intermodulation or their combination
Interference criterion: C/I, C/(N+I), (N+I)/N or I/N

35. Compatibility calculation mode
the C/I (i.e. dRSS/iRSS) can be derived:
dRSS/iRSS = (-54.5) = 1dB
Make sure that dRSS>sensitivity

36. Translation calculation mode
ILT power is high enough to result in P=100%
Low interfering Tx power results in no interference (P=0%)
Gradual increase in the ILT power resulting in increase of P%

37. Probability of interference (1/2)
For the unwanted mode, the C/I can be derived as:
dRSS/iRSS unwanted = (-77.5) = 24dB
Since the resulting C/I is above the protection criteria (19 dB), the probability of interference is 0
It is also possible to derive the (N+I)/N= (-110)= 32.5 (since I>>N). Since the (I+N)/N which is obtained is above the protection criteria (3dB), the probability of interference is 1

38. Probability of interference (2/2)
For the blocking mode, the C/I can be derived as:
dRSS/iRSS blocking = (-113.5) = 60dB
Since the resulting C/I is above the protection criteria (19 dB), the probability of interference is 0
It is also possible to derive the (N+I)/N= (-110)= Since the (I+N)/N which is obtained is below the protection criteria (3dB), the probability of interference is 0

39. Thank you - Any Questions?