STEP 5: A REAL CASE
European Communications Office
Stella Lyubchenko
October 2010
EUROPEAN
COMMUNICATIONS
OFFICE
Nansensgade 19
DK-1366 Copenhagen
Denmark
Telephone:
Telefax:
+ 45 33 89 63 00
+ 45 33 89 63 30
E-mail: [email protected]
Web Site: http://www.ero.dk
Illustration of coverage and
simulation radius in SEAMCAT
dRSS
Wanted
Receiver
dRSS
Victim
Receiver
Coverage
radius
Victim link
Wanted
Transmiter
(wt)
(Origin of
victim
coverage)
iRSS
Victim
Receiver
(vr)
(Origin of simulation)
Interfering
Transmitter
(it)
(Origin of
interfering
coverage)
Wanted
Receiver
(wr)
Coverage
radius
Interfering
link
Simulation
radius
SEAMCAT Workshop
Stella Lyubchenko / ECO
Page 2
05 October 2010
Distance between the It and the
Vr (simulation radius)
• In this case Victim Link and Interfering Link operate at 1000
MHz, therefore simulation radius is define as follows:
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Distance between the It and the
Vr (simulation radius)
• The It is located between 1 km and 10 km;
• iRSS unwanted = Pe + Ge + Gr – L;
• In this example if It located between 1 km and 10 km then iRSS
unwanted will be in the range between -59.5 dBm and -39.5 dBm
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Wanted Transmitter (Wt)
(coverage radius)
Wanted
Signal
wt  
ndensmax. Rmax
2
nchannels.nuserperchannel
clusterfrequency
wt
Rmax

Wanted
Signal
Wanted
gnal
nchannels nuserperchannel
 dens max cluster frequency
wt
Rmax
 1.42km
- User-defined radius;
- Noise-limited network;
- Trafic-limited network
f25…f32
f49…f56
f9…f16
b i le ra d i o , in a c a l l &
rio u s in v ic t im rx
d w id t h w it h l o we s t
pinl inag clo
a lsls&
f1…f8
c t im rx
h l o we s t
d w id t h w it h l o we s t
p l in g lo s s
f57…f64
f17…f24
e ra d i o , in a c a l l &
u s in v ic t im rx
l&
id t h w it h l o we s t
n g lo s s
st
Fre
que
f65…f72
f33…f40
b i le ra d i o , in a c a l l &
rio u s in v ic t im rx
f9…f16
f41…f48
nc y
f1…f8
c lu
ste
ro
f17…f24
f9
SEAMCAT Workshop
Stella Lyubchenko / ECO
Page 5
05 October 2010
Wanted Transmitter (Wt)
(coverage radius)
The dRSS for a receiver located at the edge of the coverage area is calculated in the
wt
 1.42km when dRSS = -47.5 dBm
following way: dRSS=Pe+Ge+Gr-L if Rmax
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Calculation of simulation
radius (Uniform density mode)
Within the simulation radius following number of active transmitters can be located uniformly:
nactivedenstransmitter.probtransmission. Rsimulation
2
For a single It
Rsimulation
nactive
 densitactive.probtransmission
Rsimulation  0.178km
iRSS Unwanted = - 24.5 dBm
For 10 active It
Rsimulation  0.564km
iRSS Unwanted = - 34.5 dBm
SEAMCAT Workshop
Stella Lyubchenko / ECO
Page 7
05 October 2010
Calculation of simulation
radius (”none” mode)
In the “none” mode it is
also possible to define
Uniform density
of transmitters by using the
Uniform polar distance
For the single transmitter with Rsimulation = 0.178 km
iRSS Unwanted = - 24.5 dBm
SEAMCAT Workshop
Stella Lyubchenko / ECO
Page 8
05 October 2010
Protection distance
n active
Rsimulation 
 d02
active
  densit probtransmission
SEAMCAT Workshop
Stella Lyubchenko / ECO
Calculations of iRSS Unwanted will be done
only if location of It satisfied to the following condition:
Page 9
d itvr  d 0
05 October 2010
Power control
• Victim Link and Interfering operate at 1000 MHz.
• Distance between the Victim and Interfering transmitter is 1 km.
SEAMCAT Workshop
Stella Lyubchenko / ECO
Page 10
05 October 2010
Power control
• if power control is not activated then:
iRSS Unwanted= 33(dBm)+11+9-(32.5+10log(1)+20log(1000)) = -39.5dBm
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Power control
dRSS Wanted Receiver= 33(dBm)+11+11-(32.5+10log(1)+20log(1000)) = -37.5dBm
1
P  Pthreshold
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Power control
2
-50dBm (threshold) + 3 · Step (5dB) > –37.5dBm > -50dBm (threshold) + 2 · Step (5dB)
The gain of Power control (git PC) = 10 dB then iRSSunwanted = -39.5dBm – git PC = -49.5 dBm
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Power control
3
–37.5dBm > -70dB (threshold) + 20 (dynamic range)
iRSS Unwanted = -39.5dBm – git PC = -59.5dBm
SEAMCAT Workshop
Stella Lyubchenko / ECO
Page 14
05 October 2010
Multiple Interferers
generation (Option 1)
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Multiple Interferers
generation (Option 2)
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Multiple Interferers
generation (Option 2)
Position between
Vr – It was fixed
Distance
between Wt
and Vt = 1 km
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010
Thank you
SEAMCAT Workshop
Stella Lyubchenko / ECO
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05 October 2010