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ANTARES: Communication System Design Figures of Merit
Iris Information Event - PragueMay 26-27th, 2010
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INDEX
01 Objectives02 Design drivers03 Figures of Merit Definition04 Communication System Technologies Overview05 Figures of Merit Assessment06 Verification Test Bed07 Conclusions
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Communication System Design ObjectivesANTARES
Specification of a new satellite-based Air-Ground Communication Standard To cope with the future Air Traffic Services (ATS) and Airline
Operational Control (AOC) communication needs
Based on the COCR requirements (Application definition, traffic profile).
Design of the Communication System consisting in: Communication Standard (CS) with the specification of physical
and link layers Address User (traffic), Control and Management plane, with the
signaling needs between the system elements.
Verification of the CS in the frame of the ANTARES project
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Communication System Design Drivers System requirements and traffic profiles from the COCR
requirements (and any refinement of COCR along the project) Flow down of requirements to the Communication System design Precise definition of Applications to consolidate the traffic profile
Implications from Aeronautical scenario Efficient use of limited L-band spectrum resources User terminal design (omni-directional aircraft antennas, limited
amplifier power)
Design for high system efficiency and availability (> 5 nines) Flexibility to support decentralized service provision
Preferably technologies free of IPR (Intellectual property rights) CS specification aimed for a global standardization process
ANTARES
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CS Design: Figures of Merit Definition
Figures of merit to identify the communications system technologies that better fulfil the requirements
Identification of figures of merit related to:
System efficiency, maximize bit/s / bandwidth System capacity, technologies that better support the requested
traffic
Increase system availability, taking into account the propagation channel and the aeronautical mobile scenario Compliance with applications latency requirements
Optimize power needs in the User terminal and Payload Support the adequate level of information security and provide
robustness in front of interferences
ANTARES
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CS Design: Technologies OverviewANTARES
Redundancy Security Measures Handover Procedures Diversity Techniques
All techniques related to the physical and link layers and to the control and management planes, as for example:
Forward / Return Link Modulation and Channel Coding Adaptive Coding Modulation for the forward link Forward and Return Link Medium Access Control
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CS Design: Figures of Merit Assessment
System efficiency ( bit / sec / Hz )
Forward Link Modulation and Channel Coding based on MPSK and with adaptability to channel variations
Maximize capacity using Adaptive Coding & Modulation, but increasing the signalling overhead
Forward / Return Medium Access Control with an efficient use ofscarce radio resources
Frequency reuse among beams to increase efficiency Overhead due to synchronization, guard time, guard bands and
detection needs
Impact on efficiency due to signalling overheads from: Redundancy mechanism Handover procedures to assure service continuity Security mechanism Procedures for allocation of resources of the satellite network
ANTARES
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CS Design: Figures of Merit Assessment
Maximize the system capacity
Forward and Return Medium Access Control schemes
Evaluation of capacity of Demand based access (Time, Frequency or Code Multiplex) and Random Access schemes
Limitations caused by multiple access interference. Techniques based on frequency reuse among beams limited by
interferences from adjacent beams
ANTARES
2 32 33
2
3
2
fR=3N=12 Beams=17dB
11
1 1
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CS Design: Figures of Merit Assessment Increase system availability
Modulation and coding exhibiting low Packet Error rate: Combined modulation (MPSK, OQPSK, CPM) and channel
coding (Turbo, LDPC, BCH) Performances with impairments from the mobile channel,
Satellite and User Terminal amplifier characteristics Optimize required signal-to-noise ratio for forward and return
links
Redundancy (Space and Ground segment) Avoid single points of failure and improve the system availability. Properly design of switch-over protocols (hot redundancy) Linked to ground segment architecture and interfaces
Handover mechanism Support of seamless mobility between beams, GES’s and
satellites. Performance as service continuity (minimise delay and
interruption) and signalling overheads
ANTARES
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CS Design: Figures of Merit Assessment Increase system availability (cont): applicability of Diversity
techniques Improve system availability by using different uncorrelated
communication channels Diversity techniques: satellite, GES site, polarization, space time
coding and UT antenna The use of the techniques is under evaluation, based on complexity
and performance (diversity gain)
ANTARES
Rain
(Feeder link ) (User link )
MultipathScintillationGeometric link
Rain
(Feeder link ) (User link )
MultipathScintillationGeometric link
Solar Outages
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CS Design: Figures of Merit Assessment
Optimize power needs in the User terminal
Return link Modulation and Coding: modulations (OQPSK, CPM) that minimises power requirements for the UT amplifier
Undesired out of band power: limited by regulation constraints and causing interferences to adjacent channels
Compliance with applications latency requirements
Forward and Return Multiple Access schemes, assuring delay requirements
Efficient synchronization and detection techniques Packet retransmission necessary after packet lost due to channel
propagation effects
ANTARES
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Verification Test Bed - Concept
Mapping between VTB and CS architecture
ANTARES
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Verification Test Bed - Architecture
VTB overall preliminary architecture
ANTARES
PTSPhysical Simulations
(SW based)
PTEPhysical Emulations
(HW based)
LTELogical Emulations
(SW based)
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Communication System Design - Conclusion
ANTARES Communication System Design activity
To specify a global communication standardMaximize system capacity, assuring reliability Adapted to the aeronautical scenario Efficient support of applications
Communication Standard validation
Development of a Verification Test Bed to validate the Communication Standard User Terminal to be prototyped and integrated in the Verification
Test Bed in the frame of ANTARES project
ANTARES
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Joan Manuel CebrianIndra Espacio, S.A.Telecommunication and Navigation Solutions
Roc Boronat, 133 08018 Barcelona, SPAINwww.indra.es/espacio
Thank you for your attention