Introduction to SEAMCAT Example of MCA study Stella Lyubchenko European Communications Office 55 th CRAF meeting, 3 rd - 5 th April 2013 ([email protected])[email protected].

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

mailto:[email protected]

http://www.cept.org/eco

55th CRAF meetingStella Lyubchenko / ECO

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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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• 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)

http://www.seamcat.org/


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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

Add

Duplicate 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 vectorsStatistics 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?

Introduction to SEAMCAT Example of MCA study Stella Lyubchenko European Communications Office 55 th CRAF meeting, 3 rd - 5 th April 2013 ([email protected])[email protected].

Documents

download page

outline slide

university slide

cellular structure slide

graphical user interface

montecarlo generation

p interference

probability of interference