1. 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

2. Outline Why SEAMCAT? The Graphical User Interface
Flexibility to the User’s need
Systems you can simulate
Calculations in general
Example of MCA study

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!
Jukka Rakkolainen/ERO

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
Jukka Rakkolainen/ERO

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 )
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 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
Jukka Rakkolainen/ERO

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

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)
Jukka Rakkolainen/ERO

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

13. Simple and harmonised interface
Workspaces
Interfering links
On-line Help
Multiple interferer generation
Add
Duplicate
Delete
Jukka Rakkolainen/ERO

14. Welcome + News History
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
Jukka Rakkolainen/ERO

16. Multiple vectors display
Calculated vectors or external vectors
Statistics and signal type
Jukka Rakkolainen/ERO

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
Jukka Rakkolainen/ERO

18. Comparing propagation model
Results in linear or log format
Compare two or more propagation models
Jukka Rakkolainen/ERO

19. Part 4: Systems you can simulate

20. System type
Generic
CDMA
OFDMA
Jukka Rakkolainen/ERO

21. Generic system
Jukka Rakkolainen/ERO

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
Jukka Rakkolainen/ERO

23. Part 5: Calculations in brief

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

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

26. Results
N = -110 dBm IRSS Unwanted = dBm I/N = – (-110) = 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 – 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

29. Thank you - Any questions?