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Transcript of Senior Design Projects Using Software Designed Radio (SDR) skatz/katzpage/sdr_project/sdr/sdr...آ ...

  • P R O F . S H A R L E N E K A T Z P R O F . J A M E S F L Y N N

    Dec. 2, 2008 Flynn/Katz - SDR

    1

    Senior Design Projects Using Software Designed Radio (SDR)

  • Overview

    Dec. 2, 2008 Flynn/Katz - SDR

    2

      Traditional hardware radio versus Software Defined Radio

      What is SDR?   Advantages and applications of SDR   Group projects   Schedule for Winter/Spring

  • Traditional Transceiver (Hardware)

    Dec. 2, 2008 Flynn/Katz - SDR

    3

    • Amplifiers • Modulators • Demodulators • Mixers • Filters • Oscillators

  • Disadvantages of the Traditional Hardware Receiver

    Dec. 2, 2008 Flynn/Katz - SDR

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      Simple modulation / demodulation only   Limited implementation of filters   Alignment   Aging   Complexity   Fixed design: frequency/mode   Non linearity – unwanted signals   These are limitations of a hardware based system

  • What is Software Defined Radio (SDR)?

    Dec. 2, 2008 Flynn/Katz - SDR

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    •  A new technology for implementing radio

    communications systems

    •  Art and science of building radios using primarily

    software

    •  Eliminating hardware and moving software as close to the

    antenna as possible

    •  Future direction of communications systems

    •  Encompasses many areas of EE: communications, signal

    processing, antennas, RF, digital design, software

  • Traditional Hardware Receiver

    Dec. 2, 2008 Flynn/Katz - SDR

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    RF Amplifier

    IF Amplifier x

    Demod- ulator

    Local Oscillator

    Receiver Front End

    Traditional / Hardware Receiver

    Shifts spectrum down to lower

    frequency

    Hardware: Envelope detector, slope detector, etc.

  • Software Defined Radio

    Dec. 2, 2008 Flynn/Katz - SDR

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    Software Analog to

    Digital Converter

    Radio is modified by changing the

    software. The hardware remains

    the same

  • Advantages of SDR

    Dec. 2, 2008 Flynn/Katz - SDR

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      Makes communications systems reconfigurable (adapting to new standards)

      Flexibility (universal platform – not special purpose) – Hardware stays the same

      Upgradable, modifiable   Filters/other hardware   Cognitive/Smart Radio

  • SDR Applications

    Dec. 2, 2008 Flynn/Katz - SDR

    9   Current

      Military

      Radio Astronomy

      Amateur Radio

      Future   Personal Communications

     Cell phones  Wi Fi  Entertainment distribution

      Public Safety   Broadcasting

     Digital Radio

     Digital Television

  • Components of a SDR System

    Dec. 2, 2008 Flynn/Katz - SDR

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    ADC

    FPGA (Decimator, MUX, etc.)

    USB Controller PC

    Daughterboard (optional) Motherboard

    Shifts the frequency of the desired

    signal

    Samples the

    analog signal

    Performs initial signal processing

    Software for Transmitter/

    Receiver

    For development purposes

  • USRP - Motherboard/Daughterboard

    Dec. 2, 2008 Flynn/Katz - SDR

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  • GNU Radio Software

    Dec. 2, 2008 Flynn/Katz - SDR

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      Community-based project started in 1998   GNU Radio application consists of sources (inputs),

    sinks (outputs) and transform blocks   Transform blocks: math, filtering, modulation/

    demodulation, coding, etc.   Sources: USRP, audio, file input, signal generator, …   Sinks: USRP, audio, file output, FFT, oscilloscope, …   Blocks written in C++   Python scripts used to connect blocks and form

    application

  • SDR Demonstration

    Dec. 2, 2008 Flynn/Katz - SDR

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      AM Receiver

      System can be changed to FM, SSB, Digital Modulation, etc. by just changing the software.

  • Group Projects for Spring 2009

    Dec. 2, 2008 Flynn/Katz - SDR

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      Unmanned Air Vehicle (UAV) Telemetry Link   Two way communications link between a ground station and a

    UAV   Used to send location information and images

      General Purpose Transceiver   Multi-mode: AM/FM/ SSB/Digital, Voice/Data/CW   Wide frequency spectrum: HF, VHF, UHF, +   Signal processing

      Groups will work together

  • Schedule

    Dec. 2, 2008 Flynn/Katz - SDR

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      Winter Break   Lectures on SDR (for new group members)   Introduction to digital communications (everyone)   Developing a work plan for the year

      Spring Semester   Regular working meetings   Work plan

      Winter Meeting times

  • Dec. 2, 2008 Flynn/Katz - SDR

    16

    Questions?