USRP - PowerPoint PPT Presentation

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USRP

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  1. USRP Munigala Srinivaas EE-587 (April 22 2008)

  2. Communication model Antenna — RF front end — ADC — software code RF front end – Low noise amplifier, LPF, mixer ADC -- USRP software code– GNU radio

  3. GNU RADIO • Extensive toolkit of basic processing blocks: • FIR, IIR and FFT filters • Filter coefficient generators: HP, LP, BP • Signal generators • Basic math operations • FFTs • Modulators, Demodulators, PLLs, etc • Signal sources and Sinks • Tied together with Python • Blocks written in C++

  4. USRP • Software needs method for getting digitized signals in/out of PC • USRP has emerged as standard way of dealing with RF from DC up to 2.4Ghz: daughter-cards act as up and down converters • 64Msps A/D and D/A • FPGA for various functions • Decimation, half-band filtering, etc • Digital Down converter • USB2.0 Interface to PC using FX2 (8051) uC

  5. USRP

  6. USRP It consists of • Four high-speed analog-to-digital converters • Four high-speed digital-to-analog converters • An FPGA • Glue logic

  7. Block Diagram of USRP

  8. BLOCK DIAGRAM

  9. Digital down-conversion and decimation

  10. Digital up-conversion

  11. FPGA Features of the EP1C12 • Series Cyclone™ • LEs 12,060 • M4k RAM blocks (128 x 36 bits) 52 • Total RAM bits 239,616 • PLLs 2 • Maximum user I/O pins 173 • Operating Temperature 0°C ~ 85°C

  12. References • http://gnuradio.org/trac/wiki/UsrpRfxDiagrams • http://www.propulsionpolymers.com/radioastronomy/sara_2006.ppt