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SDR Software by HB9DRV rSGB Convention, Oct 9 th ,2011

The building blocks of a SDR program, an introduction to the design and implementation of a fully functional SDR program by Simon Brown, HB9DRV. SDR Software by HB9DRV rSGB Convention, Oct 9 th ,2011. WYSIWYG. It’s going to cost. Support – time, effort, distractions

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SDR Software by HB9DRV rSGB Convention, Oct 9 th ,2011

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  1. The building blocks of a SDR program, an introduction to the design and implementation of a fully functional SDR program by Simon Brown, HB9DRV SDR Software by HB9DRVrSGB Convention, Oct 9th,2011

  2. WYSIWYG

  3. It’s going to cost • Support – time, effort, distractions • Hardware to run XP / W7 / 32-bit, 64-bit • Clean environment for builds • Hurrah for VMware

  4. Building Blocks • Select platform, very important consideration. • Windows – market share, inexpensive hardware. • Macintosh – worst of all worlds – expensive hardware, control freaks. • Linux – an option for a turnkey solutions, downside is supporting all the variations. • Embedded – an exercise for the user

  5. Software Tools • Free or commercial? • Programming languages? • One or many? Some projects use a horrible mess of programming languages. • Real engineers use C / C++. • Visual Studio 6.0, since 1999, rock solid. • Free does not mean saving money, can be frustrating.

  6. 3rd-Party Libraries • Performance • Usability • Installation Performance: Intel IPPIntel® Integrated Performance Primitives (Intel® IPP) is an extensive library of multicore-ready, highly optimized software functions for multimedia, data processing, and communications applications. Intel IPP offers thousands of optimized functions covering frequently used fundamental algorithms.Highly recommended, $200

  7. 3rd-Party Libraries Installation: NSISNSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution. Usability: Codejock

  8. Water, Water Everywhere…

  9. Data Sources • Data comes from a variety of sources: • Soundcards, • USB, • Ethernet, • Firewire. • But it’s always the same: IQ data (in-phase and quadrature modulator).

  10. The Waterfall • Must support any screen resolution • Be fast • No flicker • User-selectable colours, speeds, bandwidth, resolution (RBW)

  11. Creating the Waterfall • Fast Fourier Transforms • When a high bandwidth selected the CPU demand is high, can be too high for ATOMs • Use very efficient routines (Intel IPP) • Multi-threaded design essential • Draw to screen with either GDI or GDI+ • Judicious drawing quality settings • Get it right – up to 200 lines / second • Speed versus resolution

  12. It’s software, not a radio

  13. UI Style • Using a computer, not a radio clone • Layout for user ergonomics, don’t just paint a picture of a radio • If you want knobs go MIDI • Users get older, allow for this in UI design. • Skins (demo)

  14. Is there anybody out there?

  15. Demodulating • All modes can be demodulated with software! • Can be expensive in CPU terms, why? • Take incoming signal – say 400kHz, mix (NCO, sin,cos). • Decimate from 400kHz to IF frequency for DSP, for example 16kHz (LSB / USB / CW). • Decimation filters must be clean (demo)!

  16. Noise Reduction • Simple algorithms such as LMS (least mean Suqares) can be effective. • Very advanced algorithms such as Ephraim Malah speech enhancement, just not possible with hardware. • Automatic Notch Filters – simple variation of the LMS algorithm.

  17. Better Than All The Rest?

  18. AGC • Essential for armchair copy. • Must satisfy CW, sideband, AM users. • They may be talking tosh, but the audio quality is good  .

  19. Filters • Digital filters can be ultra sharp (shape factor) • Ring • Latency • Continuously adjustable • Free! • Several design techniques • Number taps similar to concept of number of poles

  20. Just Say No • No to requests • No to new hardware • No to anything (incl. management & hardware developers) • No, no, no... • It’s all about to user? • Wrong – I want money, honey  • Give something back – FUNcube dongle, SoftRocks

  21. Last Of All – Users! • Need support • Enthusiastic Hams • Demanding Gov. Agencies • Intrusion Detection • Homeland Security • Too many users – need support staff • Segregate amateur / SWL from commercial • Yahoo! Groups • Web-based forums • Direct 24x7 support

  22. If There’s Time • Recording for analysis, legal use • Dual synchronised SDR (next year for sure) • Direction Finding • Radio Astronomy • ...

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