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Working with programmable radios

Working with programmable radios. Hariharan Rahul. Our Group’s Experience. USRP USRP2 WiGLAN WARP Lyrtech. What have we used programmable radios for?. Network-oriented PHY design Flexible layering SOFT, MIXIT, Softcast New technologies: UWB, MIMO SWIFT , FARA, IAC

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Working with programmable radios

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  1. Working with programmable radios HariharanRahul

  2. Our Group’s Experience • USRP • USRP2 • WiGLAN • WARP • Lyrtech

  3. What have we used programmable radios for? • Network-oriented PHY design • Flexible layering • SOFT, MIXIT, Softcast • New technologies: UWB, MIMO • SWIFT, FARA, IAC • Dealing with Interference • ANC, ZigZag

  4. Peeling the Onion • Changing the PHY interface • Soft information • Changing the PHY algorithms • Interference cancellation and Interference alignment • Timing-sensitive PHY algorithms • Adaptive sensing • Bandwidth limited • Wide frequency bands Host FPGA

  5. USRP and USRP 2 • What’s good? • Affordable • Stable algorithms • Large community • Easy to use • USRP had narrow bandwidth; better with USRP2 • What’s bad? • No room for additional FPGA logic • Bandwidth only up to 20 MHz even in USRP2 • High latency

  6. WARP • What’s good? • Close to our ideal board • Large FPGA • Relatively fast host interface • Rich development platform • Onboard processor cores • What’s bad? • Cost • Relatively narrow bandwidth (FPGA code does 10 MHz, radio can support 40 MHz) • Calibration

  7. WiGLAN • What’s good? • Very high bandwidth (128 MHz) • Large FPGA to deal with high bandwidth • Calibrated • What’s bad? • Development process • Form factor • Out of print

  8. Learnt Lessons • A programmable radio is a package • Hardware • Software • SNR-BER curve is the proof of the pudding

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