Your SlideShare is downloading. ×
0
GNU Radio and the
                      Universal Software Radio Peripheral
                                           Ale...
I want a radio which...


                ?
    Lets me experiment with SDR
   Not limited to audio bandwidth
  On the air...
SDR with GNU Radio & USRP
     RF front end           analog   digital         software




• Converts RF to/from         ...
Universal Software Radio Peripheral
                      FEATURES


                       •   Four 12 bit ADC (64 Msps)
...
WBX transceiver board

                             FEATURES

                            •   50 MHz – 2.2 GHz

          ...
GNU Radio
      DSP library               Execution framework

Modulation         Filters




I/O                GUI




 ...
Programming Levels


GRC           Graphical design tool


                 Composite blocks
Python               Applicat...
Python example
Generate Code   Execute




GNU Radio Companion
Simple FM Receiver
The FM receiver on the air
             USRP with WBX and Arrow II




                        Demo video:
http://www.slid...
Simple FM Transmitter
FM Transceiver

             Full Duplex!
The simplest transponder




1.265 GHz →                       2.415 GHz →


              500 kHz bandwidth
Transponder with TM/TC
          Transponder at ∆f = 50 ... 150 kHz from centre




TM and TC at ∆f = -50kHz from centre
DVB with webcam




UVC webcam             Linux
                     Gstreamer     USRP
High Definition
                  ...
DVB with webcam


                   Video demo:
http://www.slideshare.net/csete/dvb-transmitter-fiorst-signals
The DVB system

Webcam                                                                                  USRP
            T...
Video transmitter




gst-launch -e -v v4l2src device="/dev/video1" ! video/x-raw-yuv, framerate=25/1, width=640, height=3...
Video receiver




gst-launch -v playbin uri=file:///home/alexc/gnuradio/GST/video2.ts
Summary
GNU
Radio                              USRP


•   Great for experimenting with SDR   •   Modular HW for DC to 6 GH...
Explore GNU Radio

GNU Radio website: http://gnuradio.org

GNU Radio Python tutorial: http://gnuradio.org/redmine/wiki/gnu...
Upcoming SlideShare
Loading in...5
×

Gnu Radio and the Universal Software Radio Peripheral

12,246

Published on

Presentation given at the 2010 AMSAT UK Space Colloquium. Video recording of the presentation is available from http://batc.tv/

Published in: Self Improvement
1 Comment
3 Likes
Statistics
Notes
  • PUSHKKUUU KI JAYYYYYYY .............................
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total Views
12,246
On Slideshare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
603
Comments
1
Likes
3
Embeds 0
No embeds

No notes for slide
  • SDR platform different from other SDRs
    It lets you build your own software defined radios.
  • Looking for new radio to learn and explore SDR
    Consider consumer devices
    I found what I was looking for

  • GR & USRP as SDR
    Both HW and SW to get on the air with SDR
    Open source HW & SW
  • FPGA does the hard for of DDC and DUC
    This is USRP V1 for $700
    V2 uses gigE
  • Good all round transceiver for $450
    Other DBs for DC to 6 GHz
    Open source => create own RF boards
  • A library of DSP blocks
    A framework for connecting the blocks
    Think of block diagrams for a radio
  • Apps can be written at any level
    Each level with pros/cons
    Examples at all levels
  • How a GR app can look like in Python.
    Note the 5 lines that actually build the flowgraph
  • Great for beginners and for education/demo
    Idea -> Create Dia -> Generate code -> Run -> Examine code (learn)
    Has limitations compared to Python and C++
  • Quick walkthrough
    The NBFM block is a composite block
  • A slightly extended version of the FM receiver (GUI)
    Receives packet radio from the ISS
    Decodes using multimon. Note VO-52

  • Creating an FM transmitter is easy too!
    What happens if we copy and paste this block into the receiver?
  • Warning! GNU Radio is dangerous! It will inspire you to get crazy ideas
    e.g. building a transponder.
  • Fully functional TRSP.
  • Not a flight ready transponder
    Good simulator
  • Hook up a webcam and the USRP?
    New generation of webcams can do HD for 100 EUR
    A new PC should be able to compress 720p and run the SDR. Is this possible?
  • It is possible.
    Was it difficult? Not really...
  • Could use BPSK, QPSK, QAM, OFDM...
    There are also blocks for FEC
    For now I just keep it simple
  • Gstreamer video processing pipeline created using command line.
    SDR TX built in GRC
  • Actually, we used mplayer due to the “mixed” bitrate
  • Broad topic
    I hope I did provide an overview to motivate people
    Tips for experts and newbies.

  • Transcript of "Gnu Radio and the Universal Software Radio Peripheral"

    1. 1. GNU Radio and the Universal Software Radio Peripheral Alexandru Csete OZ9AEC An open source platform for experimenting with Software Defined Radios
    2. 2. I want a radio which... ? Lets me experiment with SDR Not limited to audio bandwidth On the air from DC to “many” GHz Affordable
    3. 3. SDR with GNU Radio & USRP RF front end analog digital software • Converts RF to/from • Digital baseband analog baseband • ADC and DAC • Low rate (16 Msps) • Direct conversion using • Resampling quadrature mod/demod • Defines functionality
    4. 4. Universal Software Radio Peripheral FEATURES • Four 12 bit ADC (64 Msps) • Four 14 bit DAC (128 Msps) • Two RX and two TX • Up to 8 MHz bandwidth • USB 2.0 interface • Auxiliary analog & digi I/O
    5. 5. WBX transceiver board FEATURES • 50 MHz – 2.2 GHz • Full duplex • Direct conversion • 5-6 dB noise figure • 50-100mW TX power RF boards available between DC and 6 GHz
    6. 6. GNU Radio DSP library Execution framework Modulation Filters I/O GUI Other blocks...
    7. 7. Programming Levels GRC Graphical design tool Composite blocks Python Applications C++ Low level functions
    8. 8. Python example
    9. 9. Generate Code Execute GNU Radio Companion
    10. 10. Simple FM Receiver
    11. 11. The FM receiver on the air USRP with WBX and Arrow II Demo video: http://www.slideshare.net/csete/packet-radio-form-iss-and-vo52-downlink
    12. 12. Simple FM Transmitter
    13. 13. FM Transceiver Full Duplex!
    14. 14. The simplest transponder 1.265 GHz → 2.415 GHz → 500 kHz bandwidth
    15. 15. Transponder with TM/TC Transponder at ∆f = 50 ... 150 kHz from centre TM and TC at ∆f = -50kHz from centre
    16. 16. DVB with webcam UVC webcam Linux Gstreamer USRP High Definition GNU Radio
    17. 17. DVB with webcam Video demo: http://www.slideshare.net/csete/dvb-transmitter-fiorst-signals
    18. 18. The DVB system Webcam USRP Text H.264 MPEG-TS Packet GMSK Gain overlay encode muxer encoder modulator Gstreamer GNU Radio Unix pipe Transmitter Receiver USRP Display Channel GMSK Packet MPEG-TS H.264 filter demod decoder demux decode Unix pipe GNU Radio Gstreamer
    19. 19. Video transmitter gst-launch -e -v v4l2src device="/dev/video1" ! video/x-raw-yuv, framerate=25/1, width=640, height=360 ! timeoverlay halign=right valign=bottom shaded-background=true ! textoverlay text="Test Video 640x360 25fps" halign=left valign=bottom shaded-background=true ! x264enc bitrate=1000 ! mpegtsmux ! filesink location=myfifo.raw
    20. 20. Video receiver gst-launch -v playbin uri=file:///home/alexc/gnuradio/GST/video2.ts
    21. 21. Summary GNU
Radio USRP • Great for experimenting with SDR • Modular HW for DC to 6 GHz • Free & open source • Good receivers • Can use HW other than USRP • Full duplex transceivers • Works great on Linux • ∼100mW TX power • With some effort on Mac and Win • Does not require GNU Radio
    22. 22. Explore GNU Radio GNU Radio website: http://gnuradio.org GNU Radio Python tutorial: http://gnuradio.org/redmine/wiki/gnuradio/TutorialsWritePythonApplications GNU Radio Companion tutorial: http://gnuradio.org/redmine/wiki/gnuradio/GNURadioCompanion The Comprehensive GNU Radio Archive Network (projects): https://www.cgran.org/ Ettus Research (USRP and daughterboards): http://ettus.com USRP FAQ: http://gnuradio.org/redmine/wiki/gnuradio/UsrpFAQ My GNU Radio projects, blog, etc: http://www.oz9aec.net/index.php/gnu-radio My simple GRC examples: http://www.oz9aec.net/index.php/gnu-radio/grc-examples I have many videos with GNU Radio in action: http://www.youtube.com/oz9aec Ubuntu Linux (great OS for GNU Radio): http://www.ubuntu.com
    1. A particular slide catching your eye?

      Clipping is a handy way to collect important slides you want to go back to later.

    ×