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Basic examples of setting Basic examples of setting simulationssimulations
European Communications OfficeJean-Philippe Kermoal (ECO)
October 2010
EUROPEANCOMMUNICATIONSOFFICE
Nansensgade 19DK-1366 CopenhagenDenmark
Telephone: + 45 33 89 63 00Telefax: + 45 33 89 63 30
E-mail: [email protected] Site: http://www.ero.dk
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 2 05 October 2010
OutlineOutline
• Step 1: How is the dRSS calculated?• Step 2: My first interference probability
calculation• Step 3: Probability of interference• Step 4: Where does the interference come from?
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 3 05 October 2010
Step 1: Step 1: How is the dRSS calculated?How is the dRSS calculated?
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 4 05 October 2010
Define Victim receiver (Vr) Operating frequency Receiver bandwidth Antenna Characteristics Interference criteria Noise floor
Define Wanted transmitter (Wt) Tx power Antenna characteristics
Position the Wt vs Vr
You will learn from Step 1 how to ...
Calculate the dRSS
Test propagation model
Launch simulation
Extract dRSS vectors
✓
✓
✓
✓
✓✓✓
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 5 05 October 2010
SEAMCAT scenarioSEAMCAT scenario
Wanted Transmitter
(Wt)
Victim Receiver
(Vr)
Wanted Receiver
(Wr)
Interfering Transmitter
(It)
dRSS
iRSS
Victim link
Interfering link
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 6 05 October 2010
Victim LinkVictim Link
Wanted Transmitter
(Wt)
Victim Receiver
(Vr)
dRSS
Victim link
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 7 05 October 2010
Define Victim frequencyDefine Victim frequency
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 8 05 October 2010
Define Victim Receiver (VR)Define Victim Receiver (VR)
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 9 05 October 2010
Define Wanted Transmitter Define Wanted Transmitter (Wt)(Wt)
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 10 05 October 2010
Position of the Wt (1/2)Position of the Wt (1/2)
Uncorrelated cases mode
User-defined Radius
Correlated cases mode
Correlated distance (origin = Wt)
Noise limited Network
Traffic limited Network
Wt ↔ Vr location
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 11 05 October 2010
Position of the Wt (2/2)Position of the Wt (2/2)
Wanted Transmitter
(Wt)
Victim Receiver
(Vr)
dRSS
Victim link(0,0)
(2 km,2 km)
Delta X = 2 km
Delta Y = 2 km
x
y
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 12 05 October 2010
Calculation of the dRSSCalculation of the dRSS
• dRSS = Pe+Ge+Gr-L• dRSS = 30(dBm)+9 (dBi)+9 (dBi)-101.5 (dB)• dRSS = -53.5dBm
fdhhL rxtx log20
1000log105.32 2
2
• L = 32.5+10log(8)+20log(1000))• L = 101.5 dB
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 13 05 October 2010
Testing propagation modelTesting propagation model
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 14 05 October 2010
Launch simulationLaunch simulation
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 17 05 October 2010
Step 2: Step 2: My first interference probability My first interference probability calculationcalculation
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 18 05 October 2010
You will learn from Step 2 how to ...
Position the Vr vs It (i.e. Victim link vs Interfering link)✓
Calculate the iRSS✓Calculate the probability of interference
✓
Define Interfering transmitter (It) Tx power Antenna CharacteristicsSet the emission bandwidth
✓
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 19 05 October 2010
Interfering LinkInterfering Link
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 20 05 October 2010
Interfering FrequencyInterfering Frequency
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 21 05 October 2010
Define Interfering Define Interfering Transmitter (It)Transmitter (It)
• P(dBm/Bref) = Pe (dBm)+Att(dBc/Bref)• 33 (dBm/200KHz) = 33 + 0 (dBc/Bref)
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 22 05 October 2010
Position of the Vr vr It (1/2)Position of the Vr vr It (1/2)
Uncorrelated cases mode
None (nactive interferers)
It /Vr
Correlated cases mode
It /Wt Wt /Vr
Wr/Wt
Uniform density (nactive interferers)
Closest (single interferer)
Vr ↔ It location
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 23 05 October 2010
Position of the Vr vr It (2/2)Position of the Vr vr It (2/2)
Victim Receiver
(Vr)
Wanted Receiver
(Wr)
Interfering Transmitter
(It)
Wanted Transmitter
(Wt)
dRSS
iRSS
Victim link
Interfering link
Delta X = 4 km
Delta Y
= 4 km
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 24 05 October 2010
Calculation of the iRSSCalculation of the iRSS
• iRSS = Pe+Ge+Gr-L • iRSS = 33(dBm)+11 (dBi)+9 (dBi)-(32.5+10log(32)+20log(1000))• iRSS = -54.5dBm
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 25 05 October 2010
Step 3: Step 3: Probability of interferenceProbability of interference
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 26 05 October 2010
You will learn from Step 3 how to ...
Compatibility calculation mode✓Extract the Probability of Interference in ....✓
Translation calculation mode✓
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 27 05 October 2010
Probability of interferenceProbability of interference
• The probability of interference could be calculated by the ICE with reference to the following choice of input parameters: – 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
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 28 05 October 2010
Compatibility calculation Compatibility calculation modemode
• the C/I (i.e. dRSS/iRSS) can be derived:– dRSS/iRSS = -53.5-(-54.5) = 1dB
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 29 05 October 2010
Translation calculation Translation calculation modemode
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 30 05 October 2010
Step 4: Step 4: Where does the interference Where does the interference come from?come from?
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 31 05 October 2010
You will learn from Step 4 how to ...
Calculate the iRSS unwanted✓Calculate the iRSS blocking user-defined modeSensitivity modeProtection ratio mode
✓
Extract probability of interference(i.e. unwanted vs blocking)
✓
Modify the Unwanted Emission Mask✓
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 32 05 October 2010
Unwanted Emission maskUnwanted Emission mask
• P = 33 +(–23(dBc/Bref)) = 10 (dBm/200kHz)
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 33 05 October 2010
Calculate iRSS unwantedCalculate iRSS unwanted• iRSS unwanted calculate the interfering power
received by the Victim receiver within its 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).
Unwanted:
fVr fIt
Interfering emission maskRx bandwidth
• iRSSunwanted = P+Ge+Gr-L • iRSSunwanted = 10(dBm/200kHz)+11+9-
(32.5+10log(32)+20log(1000)) • iRSSunwanted = -77.5dBm
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 34 05 October 2010
Calculate iRSS blocking (1/4)Calculate iRSS blocking (1/4)
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 35 05 October 2010
Calculate iRSS blocking (2/4)Calculate iRSS blocking (2/4)
• User-defined mode:– iRSS blocking (fit) = Pe+Ge+Gr-L-Att (fit)– iRSS blocking = 33(dBm)+11+9-(32.5+10log(32)+20log(1000))-40(dB)
– iRSS blocking = -94.5dBm
• The It bandwidth is not considered in the iRSS blocking calculation)
Blocking:
fVr
Receiver Mask
fIt
Rx bandwidth
Rejection of the receiver
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 36 05 October 2010
Calculate iRSS blocking (3/4)Calculate iRSS blocking (3/4)
• Sensitivity mode:– Attenuation(f) = block(f) [dBm] – sensvr [dBm] + C/(N+I) [dB]
– Sensitivity = Noise Floor + C/(N+I)– Sensitivity = -110dBm + 16
= -94dBm
– Attenuation (f ) = 40-(-94)+16= 150dB
– iRSS blocking (fit) = Pe+Ge+Gr-L-Att (fit) – iRSS blocking = -54.5-150
= -204.5dBm
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 37 05 October 2010
Calculate iRSS blocking (4/4)Calculate iRSS blocking (4/4)
• Protection Ratio:– Attenuation(f) = block(f) [dBm] + C/(N+I) [dB] + 3dB– Attenuation(f) = 40 +16 +3 = 59 dB
– iRSS blocking (fit) = Pe+Ge+Gr-L-Att (fit) – iRSS blocking = -54.5-59
= -113.5 dBm
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 38 05 October 2010
Probability of interference Probability of interference (1/2)(1/2)
• For the unwanted mode, the C/I can be derived as:– dRSS/iRSS unwanted = -53.5-(-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= -77.5-(-100)= 22.5 (since I>>N). Since the (I+N)/N which is obtained is above the protection criteria (3dB), the probability of interference is 1
SEAMCAT workshopJean-Philippe Kermoal / ECO
Page 39 05 October 2010
Probability of interference Probability of interference (2/2)(2/2)
• For the blocking mode, the C/I can be derived as:– dRSS/iRSS blocking = -53.5-(-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= -113.5-(-100)= -13.5. Since the (I+N)/N which is obtained is below the protection criteria (3dB), the probability of interference is 0