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Introduction to SEAMCAT Example of MCA study
Stella Lyubchenko European Communications Office 55th CRAF meeting, 3rd - 5th April 2013 EUROPEAN COMMUNICATIONS OFFICE Nansensgade 19 DK-1366 Copenhagen Denmark Telephone: Telefax: Web Site: Jukka Rakkolainen/ERO
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Outline Why 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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Compatibility/sharing study tools
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! Jukka Rakkolainen/ERO
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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 Jukka Rakkolainen/ERO
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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 ) 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 download page (May 2011/2012 period)
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Part 2: The Graphical User Interface
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Main user interface Windows-oriented Main element – workspace.sws
Simulation controls: number of events etc.. Simulations input data – scenario: Equipment parameters, placement, propagations settings, etc. Simulation results: dRSS/iRSS vectors, Pinterference, Cellular structure Jukka Rakkolainen/ERO
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Graphic interface (1/1) Easy comparison of workspaces
Easy view of parameters at a glance Graphical reminders (tooltip) Jukka Rakkolainen/ERO
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Graphic interface (1/2) Intuitive check of simulation scenario
Shows positions and budget link information of the victim and interfering systems Overview of results (dRSS, iRSS) Jukka Rakkolainen/ERO
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Part 3: Flexibility to the User’s need
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Simple and harmonised interface
Workspaces Interfering links On-line Help Multiple interferer generation Add Duplicate Delete Jukka Rakkolainen/ERO
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Welcome + News History 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 Jukka Rakkolainen/ERO
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Multiple vectors display
Calculated vectors or external vectors Statistics and signal type Jukka Rakkolainen/ERO
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Propagation model plug-in
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 No complexity limit No limit to the inputs Description of inputs Jukka Rakkolainen/ERO
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Comparing propagation model
Results in linear or log format Compare two or more propagation models Jukka Rakkolainen/ERO
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Part 4: Systems you can simulate
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System type Generic CDMA OFDMA Jukka Rakkolainen/ERO
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Generic system Jukka Rakkolainen/ERO
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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 Jukka Rakkolainen/ERO
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Part 5: Calculations in brief
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Interference Calculations
Interfering Modes Interference Criteria Unwanted and Blocking Signals
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Unwanted Emissions fI fv fI Victim Interfering System
Interferer emission mask Receiver Bandwidth fv Interfering System Interfering emission mask fI
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Results N = -110 dBm IRSS Unwanted = dBm I/N = – (-110) = 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 – m) Deployment density considered: km2 For the secondary RAS allocation in the band 2655 – 2690 MHz; Max allowed power of IT was calculated -81 dBm in 10 MHz
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Thank you - Any questions?
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