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# Basic examples of setting simulations - PowerPoint PPT Presentation

Basic examples of setting simulations. European Communications Office Jean-Philippe Kermoal (ECO) October 2010. Outline. Step 1: How is the dRSS calculated? Step 2: My first interference probability calculation Step 3: Probability of interference

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### Basic examples of setting simulations

European Communications Office

Jean-Philippe Kermoal (ECO)

October 2010

• 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?

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

• Operating frequency

• Antenna Characteristics

• Interference criteria

• Noise floor

• Define Wanted transmitter (Wt)

• Tx power

• Antenna characteristics

Position the Wt vs Vr

Test propagation model

Launch simulation

Interfering

Transmitter

(It)

Victim

(Vr)

Wanted

Transmitter

(Wt)

Wanted

(Wr)

(Vr)

Wanted

Transmitter

(Wt)

Noise limited Network

Traffic limited Network

Wt ↔ Vr

location

Correlated distance (origin = Wt)

Correlated cases mode

Position of the Wt (1/2)

y

(2 km,2 km)

Delta Y = 2 km

Victim

(Vr)

(0,0)

x

Wanted

Transmitter

(Wt)

Position of the Wt (2/2)

• dRSS = 30(dBm)+9 (dBi)+9 (dBi)-101.5 (dB)

• L = 32.5+10log(8)+20log(1000))

• L = 101.5 dB

### Step 2: My first interference probability calculation

• Define Interfering transmitter (It)

• Tx power

• Antenna Characteristics

• Set the emission bandwidth

Calculate the probability of interference

• P(dBm/Bref) = Pe (dBm)+Att(dBc/Bref)

• 33 (dBm/200KHz) = 33 + 0 (dBc/Bref)

Uniform density (nactive interferers)

None

(nactive interferers)

Closest

(single interferer)

Vr ↔ It

location

Wr/Wt

It /Vr

It /Wt

Wt /Vr

Correlated cases mode

Position of the Vr vr It (1/2)

(Wr)

Position of the Vr vr It (2/2)

Wanted

Transmitter

(Wt)

Interfering

Transmitter

(It)

Delta Y

= 4 km

Delta X = 4 km

Victim

(Vr)

• iRSS = 33(dBm)+11 (dBi)+9 (dBi)-(32.5+10log(32)+20log(1000))

### Step 3: Probability of interference

Extract the Probability of Interference in ....

Compatibility calculation mode

Translation calculation mode

• 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

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

• user-defined mode

• Sensitivity mode

• Protection ratio mode

Extract probability of interference

(i.e. unwanted vs blocking)

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

Unwanted:

Rx bandwidth

fIt

fVr

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).

Rx bandwidth

Blocking:

Rejection

fIt

fVr

• User-defined mode:

• iRSS blocking (fit) = Pe+Ge+Gr-L-Att (fit)

• The It bandwidth is not considered in the iRSS blocking calculation)

• 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)

= -204.5dBm

• 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)

= -113.5 dBm

• For the unwanted mode, the C/I can be derived as:

• 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

• For the blocking mode, the C/I can be derived as: