SMCWS(10)06 - Basic Examples - Step1-4

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

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?


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Step 1: Step 1: How is the dRSS calculated?How is the dRSS calculated?


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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

✓

✓

✓

✓

✓✓✓


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SEAMCAT scenarioSEAMCAT scenario

Wanted Transmitter

(Wt)

Victim Receiver

(Vr)

Wanted Receiver

(Wr)

Interfering Transmitter

(It)

dRSS

iRSS

Victim link

Interfering link


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Victim LinkVictim Link

Wanted Transmitter

(Wt)

Victim Receiver

(Vr)

dRSS

Victim link


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Define Victim frequencyDefine Victim frequency


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Define Victim Receiver (VR)Define Victim Receiver (VR)


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Define Wanted Transmitter Define Wanted Transmitter (Wt)(Wt)


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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


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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


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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


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Testing propagation modelTesting propagation model


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Launch simulationLaunch simulation


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Extract dRSSExtract dRSS


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Output displayOutput display


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Step 2: Step 2: My first interference probability My first interference probability calculationcalculation


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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

✓


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Interfering LinkInterfering Link


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Interfering FrequencyInterfering Frequency


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Define Interfering Define Interfering Transmitter (It)Transmitter (It)

• P(dBm/Bref) = Pe (dBm)+Att(dBc/Bref)• 33 (dBm/200KHz) = 33 + 0 (dBc/Bref)


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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


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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


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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


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Step 3: Step 3: Probability of interferenceProbability of interference


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Compatibility calculation mode✓Extract the Probability of Interference in ....✓

Translation calculation mode✓


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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


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Compatibility calculation Compatibility calculation modemode

• the C/I (i.e. dRSS/iRSS) can be derived:– dRSS/iRSS = -53.5-(-54.5) = 1dB


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Translation calculation Translation calculation modemode


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Step 4: Step 4: Where does the interference Where does the interference come from?come from?


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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✓


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Unwanted Emission maskUnwanted Emission mask

• P = 33 +(–23(dBc/Bref)) = 10 (dBm/200kHz)


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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


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Calculate iRSS blocking (1/4)Calculate iRSS blocking (1/4)


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• 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


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• 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


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• 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


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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


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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


05 October 2010

Thank you - Any Questions?Thank you - Any Questions?

SMCWS(10)06 - Basic Examples - Step1-4

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