Transcript Modelling of Emission and Blocking mask European Communications Office Jean-Philippe Kermoal (ECO) October 2010 EUROPEAN COMMUNICATIONS OFFICE Nansensgade 19 DK-1366 Copenhagen Denmark Telephone: Telefax: + 45 33 89 63 00 + 45 33 89

Modelling of Emission and
Blocking mask
European Communications Office
Jean-Philippe Kermoal (ECO)
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
Outline
• Input to SEAMCAT
• General
• CDMA Unwanted emission mask
– BS example
– UE example
•
•
•
•
ACLR
Blocking mask
ACS
Emission floor
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
Input to SEAMCAT
• The emission mask defaults value
• Remove the default using the Clear button.
• Then use the add button to add the enough blank rows for
half of the emission mask.
• Note the format of the data:
– Offset = MHz
– Unwanted = dBc
– Reference bandwidth = kHz
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
Input to SEAMCAT
• Then use the Sym
button to get a
symetric mask
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
Reference/normalised
bandwidth
• Once SEAMCAT has generated the whole mask,
first check that the values are in the correct
order.
• The unwanted emission diagram shows two
masks
The blue mask is normalised
to 1MHz measurement
bandwidth.
The user may normalise his
input to 1MHz bandwidth but
it can be useful to input the
mask in the bandwidth
defined in the standard and
allow SEAMCAT to create
normalised mask.
The red mask is
the representation
using the user
defined reference
bandwidth.
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
Store your mask
• Spectrum mask can be saved as .txt file
• it can be reused for other workspaces using
load buttons.
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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General
•
•
•
•
The following range of
attenuation is
considered, for a
system of 30dBm
using a 20kHz
emission bandwidth.
The reference
bandwidth for the
attenuation is 10kHz.
Within the emission
bandwidth the
reference bandwidth
is taken equal to the
emission bandwidth.
Note: The technical specifications of the receiver and transmitter are commonly extracted
from the ETSI standard (see http://www.etsi.org/WebSite/Standards/Standard.aspx)
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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CDMA emission mask BS example
Spectrum emission mask values, BS maximum output power P  43 dBm (TS25.104)
•
Assuming a BS Tx power of 43 dBm, and with addition of the ITU-R SM.329 limit above
12.5 MHz
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
CDMA emission mask UE example
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
ACIR = f(ACLR, ACS)
• ACIR = adjacent-channel interference
ratio
ACIR 
1
1
1

ACLR ACS
• In UL, the dominant part of ACIR is due
to the UE adjacent channel leakage
(ACLR) i.e. ACSBS is very large compare
to ACLRUE and ACIR ≈ ACLRUE.
Frequency
Offset
Tx
1
Rx
ACLR
ACS
• In DL, the dominant part of ACIR is due
to the UE frequency selectivity (ACS)
i.e. ACLRBS is very large compare to
ACSUE and ACIR ≈ ACSUE
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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Transmiter
mask
Receiver
filter
frequency
05 October 2010
ACLR in SEAMCAT
• No use of the ACLR directly.
• Emission spectrum Mask is used
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
Blocking Mask
• User-defined mode
• Protection ratio
• Sensitivity modes
Receiver Mask
Rx bandwidth
Blocking:
Rejection
of the receiver
fv
fI
Blocking Response = filtering (user defined mode)
Receiver Mask
Rx bandwidth
Blocking:
Rejection
of the receiver
fv
fI
Blocking Response = ACS + Blocking
(PR and Sensitivity mode) (ETSI)
(ETSI)
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
BS blocking Mask
SEAMCAT Workshop
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05 October 2010
ACS in SEAMCAT
• ACS is the same as the blocking
attenuation input
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
Emission Floor
• Useful when power control is used
• This emission floor mask (frequency
offset (MHz), emission floor (dBm),
reference bandwidth (MHz)).
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010
Thank you - Any Questions?
SEAMCAT Workshop
Jean-Philippe Kermoal / ECO
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05 October 2010