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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

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
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
software radio
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
sdr status in usa
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
different types of software radios

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

sdr internals
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

software radio phase space
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.

vanu status radio front end for agility
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
sdr tradeoffs
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
for more information
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