WS PRESENTATION TEMPLATE

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Asier Alonso Muñoz Intelligent Transport
Communication Networks Researcher TECNALIA-TELECOM

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SDR Based Methodology for On-Board
Communications Systems Design
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The next big thing ?
V2V R2V I2V V2U
EFFICIENCY
SAFETY
NAVIGATION TRACKING
COMFORT INFOTAINMENT
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Probably!, but some challenges still unsolved

• Many radio standards forced to coexist on board,
  integrated in a single device !?
• Time mismatch between cars and communication
  equipment lifecycles
• Radio standards not fully harmonized worldwide

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Our motivation

• To find an innovative design methodology for
  on-board (and infrastructure) devices which
  enables multiple radio integration

To define a reconfigurable system architecture
which enables seamless evolution towards new
communication standards
To design a new signal processing algorithm
which, making use of new acquisition techniques,
allows reducing the number of Hw components
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and here it comes SDR !

• One device per ? One single device
  waveform integrating multiple
  radios
• Many Hw components ? Single programmable
  device (FPGA, DSP)

Amplifying Filtering Downconverting
Traditional SDR platform scheme
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What SDR provides

• Different waveforms in a single device
• Multiple standards integrated
• Costs dramatically reduced
• Manufacturing, logistical support and operating
  expenditures
• Reconfigurability and upgradability
• New standards, features or capabilities added
• Over-The-Air (OTA) reprogramming
• Lifecycle mismatch reduced ? customer
  satisfaction improved
• Specific location-based Sw loads
• Addressing regional/national requirements

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SDR-based On-Board Hw Architecture
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Signal Processing

• Digitization in SDR systems is made
• In theory, just after the antenna
• In practice, after the RF front end
• This adds limitations regarding flexibility
• A possible solution ? direct digitization
• Choice of an appropriate sampling frequency
• Digital front-end design

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Sampling Frequency Choice

• Bandpass sampling allows supressing analog
  downconversion from the RF front-end, but it
  requires
• Careful study of the appropriate sampling
  frequency
• Analysis of the generated spurious signals
• Two main benefits
• Bandwidth reduction for acquiring multiple
  signals
• More flexibility

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Sampling Frequency Choice (contd)

• Example GNSS signals GPS (L1) Galileo (E5a/b)
  ? Full Bw 400 MHz

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Sampling Frequency Choice (contd)

• Final frequency after aliasing is
• Our goal was to match Galileo and GPS central
  frequencies so we obtain

Fal MFs Fo
-NFsFGPSMFs-FGal
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Sampling Frequency Choice (contd)

• 7 possible sampling frequencies

Final Bw 60 MHz
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Digital Front-End Design

• Each GNSS signal is processed independently
• Each band is processed with a standard
  downsampling scheme

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Results

• Two ways of studying the behaviour of the system
• Preliminary Simulink/Modelsim analysis ? chosen
  sampling frequency 153.7MHz
• Laboratory tests ? measuring of dynamic range
  (main drawback of direct digitization)

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Results (contd)

• Dynamic range tests If signal power decreases ?
  undesired spurious signals
• Dynamic range 40 dB ADCs DR

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Conclusions

• The three proposed objectives have been met
• Choosing a new paradigm of design for
  reconfigurable systems ? SDR
• Designing an architecture for on-board devices ?
  Generic open platform
• Finding new signal processing algorithms which
  can reduce the number of Hw elements ? Digital
  Front-End for Direct Digitization

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Next Steps

• Designing a flexible analog front-end which
  allows working with different real signals
• Research on algorithms which allow dynamic
  reconfiguration of the system

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Thank you !

• Asier Alonso Muñoz
• Intelligent Transport Communication Networks
  Researcher
• TECNALIA TELECOM
• aalonso_at_robotiker.es
• www.tecnalia.es/telecom
• www.robotiker.es

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Backup Slides
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TECNALIA Telecom Business Unit of TECNALIA for
the Telecommunications Sector

• TECNALIA Telecom develops its activity in the
  following Research Fields
• Broadband Networks
• Wireless Systems
• Mobile Service Platforms
• TECNALIA Telecom provides
• Joint collaboration in Pre-competitive,
  Public-funded projects
• Contract based Research and Development Projects
• IPR and Research assets (Products Technology)
• New exploitation routes for innovation spin-ins,
  spin-offs, joint-ventures, etc.

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Telecom Wireless Systems Intelligent Transport
Communication Networks Group

• Within the Wireless Systems Research Area, the
  Intelligent Transport Communication Networks
  Group specializes in communication technologies
  for transport/vehicular environments, focusing
  its activity in applied research for V2X in
• On-board system optimisation (OBUs, in-vehicle
  comms CAN, BT, UWB, NFC, RFID)
• VANET networks and devices (WAVE, 802.11p, IR,
  ZigBee)
• Cooperative systems for road transport
• Broadcasting (DAB, DVB-H, SDR)
• Network architectures (3G, WiMAX, Ad-Hoc,
  routing)
• GNSS technologies (GPS, GALILEO, EGNOS) and
  indoor guidance
• Facts Figures
• Research Team 1 Group Leader, 6 Researchers, 1
  PhD Researcher
• RD Assets OpenGNSS, OpenGNSS Lite, OpenSDR,
  eOBU
• Public Funded Research Projects CYBERCARS2
  (FP6), MOBILIZING INTERNET (ITEA), MARTA, mVIA,
  NCV2015 (Spanish Programmes), INCAVE, iMUGI
  (Basque Programmes)