Transcript WP3-3 - CAPANINA

WP3.3:
Steerable antenna technologies:
Signal processing aspects
Participants:
UoY (18MM); POLITO (19MM); EUCON (6MM)
Tim Tozer & Yuriy Zakharov
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Workpackage Tasks
Beamforming for HAPs (UoY)
In particular, for communications with high-speed trains
Beamforming for ground terminals (POLITO)
In particular, installed on high-speed trains
Implementation aspects (EUCON)
In DSP software
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Philosophy for both WP 3.2 & 3.3
M0
M4
End Mar 04
Explore System
Requirements
Explore Terminal
Constraints
 Link Budgets
 Tracking /
Availability
 Polarisation
 Geometry
 Etc.
 Geometry
 Size / Mass
 Speed
Explore Prior Art
 Antennas
 Associated Signal
Processing
time
3
promising concepts
(Pointing, Doppler)
 Etc.
Agree
Requirements
Spec
 Identify promising
solutions
 Explore enhancements
 Assessment of most
promising solutions in
terms of requirements
 Develop
enhancements
M12
Develop selected
Identify
Signal
Processing
Issues.
Develop
interesting
SP aspects?
WP3.3 Input from other WPs
RF aspects of steerable antennas (from WP3.2)
Antenna array architecture
Variation / tolerances in antenna array geometry; calibration
aspects (real-time calibration; reliability of antenna array
elements
Variation / tolerances in delays, phase shifts, element
gains/weights, etc.
Communication signal structure (from WP2.1)
Propagation (from WP2.2)
Fading correlation of received signals over the antenna
aperture and time
Multipath structure of received signals (number of multipath
components, angle and delay profiles)
Platform stability (from test trials??)
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WP3.3 Milestones & Deliverables
Internal Milestones + Documents, Month 5:
a) Possible approaches for RF, EM and Mechatronic Aspects of Train & HAP
antennas.
b) Possible approaches for Signal Processing Aspects of Train & HAP
antennas.
Month 12: Possible antenna topologies for ground terminals and aerial
platforms identified
Month 24: Beamforming algorithms and implementation aspects for ground
terminals and aerial platforms specified
Month 34: Detailed design of adaptive beamforming algorithms for ground
terminal and aerial platform antennas
Deliverables
D17: Report on adaptive beamforming algorithms for advanced antenna types
for aerial platform and ground terminals (M27).
D28: Report detailing the implementation aspects of signal processing for
aerial platform and ground terminal beamformers (M36).
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Antenna geometry options
Overlapping subarrays
Simplify the feed network, RF part and signal processing
Vertical antennas
Non-traditional foot-print
Random element positions
Dispersed array structure
Errors in element positions
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Methodology
Asymptotic theoretical analysis
Computer simulation of proposed techniques
Extrapolation of concepts from “Underwater acoustic
antenna arrays”
Valuable pedigree from digital beamforming for large
acoustic arrays
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Research topics
Adaptive algorithms:
Simple implementation (DSP software, FPGA & ASIC hardware
platforms)
Low power consumption
Algorithms for matrix computations
Solution of linear systems of equations
Matrix inversion
Eigenvalue decomposition
Effect of errors
Look direction and steering vector errors
Element failure and element position errors
Weight errors
Antenna array calibration
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Dichotomous Coordinate
Descent (DCD) algorithm
Real-time solutions to large systems of linear equations
Fixed-point oriented algorithm (software implementation on a DSP platform)
Does not involve multiplications or divisions (hardware implementation on FPGA & ASIC)
Fast convergence
Current applications
Echo cancellation
Equalisation
Multiuser detection
Tomography
Possible applications
Adaptive algorithms
Matrix inversion
Eigenvalue decomposition
Publications:
Zakharov Y. V. and Tozer T. C. “Data processing, particularly in communication systems”, Patent
Application, GB0208329.3, WO03088076, Published Oct. 2003.
Zakharov Y. V. and Tozer T. C. “Equation solving”, Patent Application, GB0324191.6,
US10/685983, Filed Oct. 2003.
Zakharov Y. V. and Tozer T. C. “Box-constrained multiuser detection based on multiplicationfree coordinate descent optimisation”, ICASSP’2004, Submitted.
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Reminder: WP 3.2 - Steerable antenna
technologies: EM, RF and mechatronics aspects
Start date: M0
Participants : UOY (16MM) CSEM (31MM) SkyLINC (1MM) CRL (5MM?)
Objectives:
To investigate the antenna electromagnetic, RF and mechanical aspects for the mobile mm-wave
broadband delivery and put forward solutions for the critical components .
Outline Description
1: Aperture Antennas
To determine impact of statistical variability of real antenna parameters on performance
characteristics of the system as a whole . Mathematical tools based on real antenna
specifications & measurements developed to calculate system performance & variation
2: Smart Antennas
Study smart antenna configurations to determine suitability for moving platforms.
Consider smart antenna types, technologies and topologies.
a) Fast Trains
b)
HAP antenna array.
Feasibility of implementing the required RF hardware will be investigated.
Solutions will also relate to the signal processing (beamforming algorithms) activity WP3.3
3: mm-wave RF front end.
Deliverables:
D24 Steerable antenna architectures and critical RF circuits performance. (M35)
Milestones: M6. HAP payload antenna statistical variance. Concepts for “train” antennas including mechatronics.
M12. RF circuit constraints. Design experiment for validation of concepts.
M18. Model mm-wave active element performance for steerable antenna implementation.
M30. Test evaluation and specification of preferred solution for steerable antenna
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Reminder WP 3.3 - Steerable antenna technology:
Signal processing aspects
Start date: M0
Participants : UOY (18MM) POLITO (19MM) EUCON (6MM)
Objectives:
Investigation of advanced adaptive beamforming technologies not previously
considered to determine applicability to aerial platform applications and their
expected performance within HAP communications scenarios. To design a
vehicular steerable antenna such as might be deployed on a train. To enable
communication with an aerial platform anywhere within the coverage area.
Outline Description
1: Beamforming Antennas
Design to establish & improve communication link between HAP and ground terminals.
Design of an adaptive beamformer on-board of the platform, exploiting fast adaptability of
an electronically steered beam pattern.
2: Beamforming algorithms for ground terminal antennas
Implementing adaptive beamforming solution at the CPEs and on vehicles, to continuously
track HAP trajectory.
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Reminder WP 3.3
/contd
3: Implementation aspects of beamforming algorithms
Will define the mm-wave equipment specification and characteristics required for smart
antenna implementation. The specification will include both a transmit and receive chain
configurations, noise performance, output power, linearity, filtering requirements, etc. The
work will also define the interface to the software radio IF.
4: Beamforming Algorithms
Implementation aspects of signal processing algorithms. Technological issues such as
quantisation, fixed/floating point algebra, design optimisation in terms of power and
computational efficiency. Aimed at implementation of selected algorithms on DSP. The
performance will be assessed by simulating real working conditions.
Deliverables
D17: Adaptive beamforming algorithms for advanced antenna types for aerial platform
and ground terminals (M27).
D28: Implementation aspects of signal processing for beamformers (M36).
Milestones and expected results
M12: Possible antenna topologies for ground terminals and aerial platforms
M24: Beamforming algorithms & implementation aspects for those terminals
M34: Detailed design of adaptive beamforming algorithms
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