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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

Basic examples of setting simulations

European Communications Office

Jean-Philippe Kermoal (ECO)

October 2010

outline
Outline
  • 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?
slide4

You will learn from Step 1 how to ...

  • 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

Calculate the dRSS

Test propagation model

Launch simulation

Extract dRSS vectors

seamcat scenario
SEAMCAT scenario

iRSS

dRSS

Interfering

Transmitter

(It)

Victim

Receiver

(Vr)

Interfering link

Victim link

Wanted

Transmitter

(Wt)

Wanted

Receiver

(Wr)

victim link

Victim

Receiver

(Vr)

dRSS

Victim link

Wanted

Transmitter

(Wt)

Victim Link
position of the wt 1 2

Uncorrelated cases mode

Noise limited Network

User-defined Radius

Traffic limited Network

Wt ↔ Vr

location

Correlated distance (origin = Wt)

Correlated cases mode

Position of the Wt (1/2)
position of the wt 2 2

Delta X = 2 km

y

dRSS

(2 km,2 km)

Delta Y = 2 km

Victim

Receiver

(Vr)

Victim link

(0,0)

x

Wanted

Transmitter

(Wt)

Position of the Wt (2/2)
calculation of the drss
Calculation of the dRSS
  • dRSS = Pe+Ge+Gr-L
  • dRSS = 30(dBm)+9 (dBi)+9 (dBi)-101.5 (dB)
  • dRSS = -53.5dBm
  • L = 32.5+10log(8)+20log(1000))
  • L = 101.5 dB
slide18

You will learn from Step 2 how to ...

Position the Vr vs It (i.e. Victim link vs Interfering link)

  • Define Interfering transmitter (It)
  • Tx power
  • Antenna Characteristics
  • Set the emission bandwidth

Calculate the iRSS

Calculate the probability of interference

define interfering transmitter it
Define Interfering Transmitter (It)
  • P(dBm/Bref) = Pe (dBm)+Att(dBc/Bref)
  • 33 (dBm/200KHz) = 33 + 0 (dBc/Bref)
position of the vr vr it 1 2

Uncorrelated cases mode

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)
position of the vr vr it 2 2

Wanted

Receiver

(Wr)

Position of the Vr vr It (2/2)

dRSS

Wanted

Transmitter

(Wt)

iRSS

Interfering

Transmitter

(It)

Victim link

Delta Y

= 4 km

Interfering link

Delta X = 4 km

Victim

Receiver

(Vr)

calculation of the irss
Calculation of the iRSS
  • iRSS = Pe+Ge+Gr-L
  • iRSS = 33(dBm)+11 (dBi)+9 (dBi)-(32.5+10log(32)+20log(1000))
  • iRSS = -54.5dBm
slide26

You will learn from Step 3 how to ...

Extract the Probability of Interference in ....

Compatibility calculation mode

Translation calculation mode

probability of interference
Probability 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
compatibility calculation mode
Compatibility calculation mode
  • the C/I (i.e. dRSS/iRSS) can be derived:
    • dRSS/iRSS = -53.5-(-54.5) = 1dB
slide31

You will learn from Step 4 how to ...

Modify the Unwanted Emission Mask

Calculate the iRSS unwanted

  • Calculate the iRSS blocking
  • user-defined mode
  • Sensitivity mode
  • Protection ratio mode

Extract probability of interference

(i.e. unwanted vs blocking)

unwanted emission mask
Unwanted Emission mask
  • P = 33 +(–23(dBc/Bref)) = 10 (dBm/200kHz)
calculate irss unwanted

Interfering

emission mask

Unwanted:

Rx bandwidth

fIt

fVr

Calculate iRSS unwanted
  • 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-(32.5+10log(32)+20log(1000))
  • iRSSunwanted = -77.5dBm

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).

calculate irss blocking 2 4

Receiver Mask

Rx bandwidth

Blocking:

Rejection

of the receiver

fIt

fVr

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)
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

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

probability of interference 1 2
Probability of interference (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
probability of interference 2 2
Probability of interference (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
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