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Introduction to SEAMCAT Example of MCA study

Introduction to SEAMCAT Example of MCA study. Stella Lyubchenko European Communications Office 55 th CRAF meeting, 3 rd - 5 th April 2013 ( stella.lyubchenko@eco.cept.org ). Outline. Part 1: Why SEAMCAT?. Compatibility/sharing study tools.

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Introduction to SEAMCAT Example of MCA study

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  1. Introduction to SEAMCATExample of MCA study Stella Lyubchenko European Communications Office 55th CRAF meeting, 3rd - 5th April 2013 (stella.lyubchenko@eco.cept.org)

  2. Outline

  3. Part 1: Why SEAMCAT?

  4. 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!

  5. 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

  6. 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)

  7. Usage within and outside CEPT Source: google analytics on the www.seamcat.org download page (May 2011/2012 period)

  8. Part 2: The Graphical User Interface

  9. 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

  10. Graphic interface (1/1) Easy comparison of workspaces Easy view of parameters at a glance Graphical reminders (tooltip)

  11. 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)

  12. Part 3: Flexibility to the User’s need

  13. Simple and harmonised interface Workspaces Interfering links On-line Help Multiple interferergeneration Add Duplicate Delete

  14. Welcome + NewsHistory • Welcome + News • History

  15. Libraries and Batch • Easy to create workspaces with predefined libraries • Edit, import, export • Easy to run sequentially workspaces • Batch operation • Intuitive use

  16. Multiple vectors display Calculated vectors or external vectors Statistics and signal type

  17. 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

  18. Comparing propagation model Results in linear or log format Compare two or more propagation models

  19. Part 4: Systems you can simulate

  20. System type Generic CDMA OFDMA

  21. Generic system

  22. 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

  23. Part 5: Calculations in brief

  24. Interference Calculations Interference Criteria Interfering Modes Unwanted and Blocking Signals

  25. Interferer emission mask fI Unwanted Emissions • Victim Receiver Bandwidth fv • Interfering System Interfering emission mask fI

  26. 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)

  27. Part 6: Example of MCA study

  28. 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

  29. Thank you - Any questions?

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