introduction to seamcat example of mca study
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Introduction to SEAMCAT Example of MCA study. Stella Lyubchenko European Communications Office 55 th CRAF meeting, 3 rd - 5 th April 2013 ( [email protected] ). Outline. Part 1: Why SEAMCAT?. Compatibility/sharing study tools. - PowerPoint PPT PresentationTRANSCRIPT
Introduction to SEAMCATExample of MCA study
Stella Lyubchenko European Communications Office
55th CRAF meeting, 3rd - 5th April 2013([email protected])
EUROPEANCOMMUNICATIONSOFFICE
Nansensgade 19DK-1366 CopenhagenDenmark
Telephone: + 45 33 89 63 00Telefax: + 45 33 89 63 30
E-mail: [email protected] Site: http://www.cept.org/eco
55th CRAF meetingStella Lyubchenko / ECO
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OutlineWhy SEAMCAT?
The Graphical User Interface
Flexibility to the User’s need
Systems you can simulate
Calculations in general
Example of MCA study
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Part 1: Why SEAMCAT?
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• Analytical analysis, usually by worst-case approach:– Minimum Coupling Loss (MCL) method, to establish
rigid rules for minimum “separation”• Statistical analysis of random trials:
– The Monte-Carlo method, to establish probability of interference for a given realistic deployment scenario
– That is where SEAMCAT comes into picture!
Compatibility/sharing study tools
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Purpose
• SEAMCAT is designed for:– Generic co-existence studies between different
radiocommunications systems operating in same or adjacent frequency bands
– Not designed for system planning purposes• Can model any type of radio systems in terrestrial interference
scenarios (mobile, broadcasting, Fixed etc..)• Used for analysis of a variety of radio compatibility scenarios:
– quantification of probability of interference between various radio systems (unwanted emissions, blocking/selectivity)
– quantification of throughput and data loss for CDMA and OFDMA system
• Based on Monte-Carlo generation
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Strategic tool for CEPT
• For performing compatibility/sharing studies– Used in generating studies for ECC/CEPT Reports
• As a Reference tool– Recognised at ITU (Rep. ITU-R SM.2028-1)
• As an agreed work platform– Project Teams (PTs) can focus on the input
parameters and not on the algorithm– Sharing simulation between proponents ease the
trust in the results• For educating future generation of spectrum
engineer (Administrations, Industry or University)
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Usage within and outside CEPT
Source: google analytics on the www.seamcat.org download page (May 2011/2012 period)
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Part 2: The Graphical User Interface
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• Windows-oriented • Main element – workspace.sws
Main user interface
Simulations input data – scenario:Equipment parameters, placement, propagations settings, etc.
Simulation controls: number of events etc..
Simulation results:dRSS/iRSS vectors, Pinterference, Cellular structure
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Graphic interface (1/1)
Easy view of parameters at a glance
Easy comparison of workspaces
Graphical reminders (tooltip)
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Graphic interface (1/2)
Shows positions and budget link information of the victim
and interfering systems
Overview of results (dRSS, iRSS)
Intuitive check of simulation scenario
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Part 3: Flexibility to the User’s need
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Simple and harmonised interface
AddDuplicate Delete
Multiple interferer
generation
On-line Help
Workspaces Interfering links
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Welcome + NewsHistory• Welcome + News • History
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Libraries and Batch
• Easy to create workspaces with predefined libraries• Edit, import, export
• Easy to run sequentially workspaces• Batch operation• Intuitive use
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Multiple vectors displayCalculated vectors or
external vectors Statistics and signal type
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• This plug-in may be used to define ANY kind of propagation model
• The plug-in may be inserted at any point where propagation model is defined in the scenario
Propagation model plug-in
• No complexity limit • No limit to the inputs• Description of inputs
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Comparing propagation model
Compare two or more propagation models
Results in linear or log format
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Part 4: Systems you can simulate
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System type
Generic CDMA OFDMA
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Generic system
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Cellular modelling• Modelling of cellular systems as victim,
interferer, or both:• Quasi-static time within a snapshot• One direction at a time (uplink or downlink)
• CDMA• Voice traffic only • Particular CDMA standard defined (CDMA2000-1X, W-CDMA/UMTS)
• OFDMA• LTE
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Part 5: Calculations in brief
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Interference CalculationsInterfering Modes Interference Criteria
Unwanted and Blocking Signals
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Unwanted Emissions• Victim
fv
Receiver Bandwidth
• Interfering System
fI
Interfering emission mask
fI
Interferer emission mask
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Results
N = -110 dBmIRSS Unwanted = - 97.78 dBmI/N = - 97.78 – (-110) = 12.21 dB ( Calculated by SEAMCAT)Interference Criterion was: I/N = 0 ( Input to SEAMCAT)
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Part 6: Example of MCA study
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Assumptions for study
• The secondary RAS allocation in the band 2655 – 2690 MHz• Protection criterion -177dBm in 10MHz which should not be
exceeded for 2% of time (in SEAMCAT it will be interpreted as a percentage of snapshots for which criterion is not exceeded)
• Telescope height is 50 m.• 1 aircraft within 100 km (within a cylinder: 3000 m – 15000 m)• Deployment density considered: 0.0000255 km2
• For the secondary RAS allocation in the band 2655 – 2690 MHz;• Max allowed power of IT was calculated -81 dBm in 10 MHz
MCA sws
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Thank you - Any questions?