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Software Radio Technology

Presentation to NSMA conference Rosslyn, VA May 21, 2002. Software Radio Technology. Dr. John Chapin CTO Vanu, Inc. One Porter Square, Suite 18 Cambridge, MA 02474 http://www.vanu.com. Vanu, Inc. Overview Founded September 1998 Spin-off from MIT SDR research project 1994–1998

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Software Radio Technology

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  1. Presentation to NSMA conference Rosslyn, VA May 21, 2002 Software Radio Technology Dr. John Chapin CTO Vanu, Inc. One Porter Square, Suite 18 Cambridge, MA 02474 http://www.vanu.com

  2. Vanu, Inc. • Overview • Founded September 1998 • Spin-off from MIT SDR research project 1994–1998 • Software vendor • Contracts • Military DARPA, JTRS Joint Program Office • Public Safety National Institute of Justice • Basic Research National Science Foundation, MDA • Automotive Telematics device for a Tier 1 Supplier • Surveillance Major defense conglomerate

  3. Hardware Radio Separate devices for different functions Any fix or upgrade needs a hardware change PCS voice Analog VHF APCO P25 WLAN Software Radio • Software Radio • One device for many functions • Upgrade through software change

  4. Military Harris Falcon II, Motorola WITS Since 1999, all DOD tactical radio procurements must be SDR Military SDR standard: Joint Tactical Radio System (JTRS) Civilian SDR devices always certifiable as if they were legacy devices FCC task force began in 1998 on SDR-specific rules Docket 00-47 Notice of Inquiry March 2000 NPRM December 2000 First R&O September 2001 SDR status in USA

  5. Portable SDR (a.k.a. Pure SWR) • Software costs amortized over many platforms • Easily upgrade hardware over time Vanu RadioScape SpeakEasy AirNet • Reconfigurable SDR • All signal processing reconfigurable • Significant use of FPGA or assembly code Different types of software radios • Modal SDR • Software controls and configures the radio • ASIC or analog hardware Dual-mode cell phone

  6. SDR internals voice data Analog at carrier frequency Digital samples baseband IF Radio Front End antenna RF tuning Analog-Digital Conversion Channelization No waveform-specific processing Embedded computer All waveform-specific functions in software

  7. Software Radio Phase Space A: HF STR-2000 B: COTS Handset C: SWR Cell Site D: SPEAKeasy II V: Vanu, Inc. Software Radio X: Ideal Software Radio Source: Mitola, Joseph. “Software Radio Architecture: A Mathematical Perspective”, IEEE JSAC, April 1999.

  8. Vanu status: Radio Front End for Agility • Multiple-IC board • Prototype quantities this summer • 30-512 MHZ, worldwide cellular & PCS bands • Low power, full duplex, cost $100s • Single IC • Ideal future platform, cost $10s • Manufacturers waiting for market to develop TECHNOLOGY PROGRESS • Discrete components • Current TX limited to < 1 GHz, < 1 MHz wide • Separate front ends for receive and transmit • Cost $1000s

  9. Vanu status: Processing for Flexibility

  10. Higher power consumption Reconfigurable processing vs dedicated circuits Primarily an issue for battery-powered devices Sensitivity/selectivity of radio front end Challenging to achieve if highly agile system Primarily an issue for surveillance, military applications Lower gain if antenna is multi-band Easy solution: attach 2 or 3 antennas Primarily an issue for handheld devices SDR ready today for many uses SDR tradeoffs

  11. For more information • http://www.sdrforum.org • FCC Docket 00-47 • Two new books from Wiley • Tuttlebee, W., editor • Chapters by all the major players in the field • Software Defined Radio: Origins, Drivers and International Perspectives • Software Defined Radio: Enabling Technology • http://www.vanu.com • John Chapinjchapin@vanu.com

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