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Transcript of Senior Design Projects Using Software Designed skatz/katzpage/sdr_project/sdr/sdr... Senior Design...

  • Senior
Design
Projects
Using
 Software
Designed
Radio
(SDR)


    Prof.
Sharlene
Katz
 Prof.
James
Flynn


    Dec.
2,
2008
 1
Flynn/Katz
‐
SDR


  • Overview


    •  Traditional
hardware
radio
versus
Software
 Defined
Radio



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


    Dec.
2,
2008
 2
Flynn/Katz
‐
SDR


  • Traditional
Transceiver
(Hardware)


    Dec.
2,
2008
 Flynn/Katz
‐
SDR
 3


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


  • Disadvantages
of
the
Traditional
 Hardware
Receiver


    •  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


    4 Dec. 2, 2008 Flynn/Katz
‐
SDR


  • Dec.
2,
2008
 Flynn/Katz
‐
SDR
 5


    What
is
Software
Defined
Radio
 (SDR)?


    •  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
 6


    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.


  • Dec.
2,
2008
 Flynn/Katz
‐
SDR
 7


    Software
Defined
Radio


    Software Analog to

    Digital Converter

    Radio
is
modified
by
 changing
the
software.

 The
hardware
remains


    the
same


  • Advantages
of
SDR


    •  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


    Dec.
2,
2008
 8
Flynn/Katz
‐
SDR


  • Dec. 2, 2008 Flynn/Katz
‐
SDR
 9

    SDR
Applications
 •  Current


    –  Military
 –  Radio
Astronomy
 –  Amateur
Radio


    •  Future
 –  Personal
Communications


    •  Cell
phones
 •  Wi
Fi
 •  Entertainment
distribution


    –  Public
Safety
 –  Broadcasting



    •  Digital
Radio
 •  Digital
Television


  • Dec.
2,
2008
 Flynn/Katz
‐
SDR
 10


    Components
of
a
SDR
System


    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


  • Dec.
2,
2008
 Flynn/Katz
‐
SDR
 11


    USRP
‐
Motherboard/ Daughterboard


  • Dec.
2,
2008
 Flynn/Katz
‐
SDR
 12


    GNU
Radio
Software


    •  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


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



    Dec.
2,
2008
 Flynn/Katz
‐
SDR
 13


  • Group
Projects
for
Spring
2009


    •  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


    Dec.
2,
2008
 Flynn/Katz
‐
SDR
 14


  • Schedule
 •  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
 15


  • Questions?


    Dec.
2,
2008
 16
Flynn/Katz
‐
SDR