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Ultra-wideband (UWB) Signals for Communications and Localization

Discover the definition, advantages, and applications of Ultra-Wideband (UWB) signals for communications and localization. Explore the regulations, common signaling formats, and advantages of UWB technology, including high data rate and precise position estimation. Learn about various UWB applications, from communications to radar and medical uses.

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Ultra-wideband (UWB) Signals for Communications and Localization

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  1. Ultra-wideband (UWB) Signals for Communications and Localization Sinan Gezici Assistant Professor Dept. of Electrical and Electronics Eng. Bilkent University gezici@ee.bilkent.edu.tr

  2. Ultra-wideband (UWB) • Definition • (Absolute) bandwidth ≥ 500 MHz Babs = fH– fL • Fractional bandwidth ≥ 0.2 Bfrac = (fH– fL) / fC≥ 0.2

  3. Regulations for UWB • FCC in the US allows transmission in 3.1-10.6 GHz band • Coexists with incumbent systems • Low power spectral density (-41.3 dBm/MHz) • Large spreading factors UWB

  4. UWB Signals • 3 common signaling formats: • OFDM UWB • DS-CDMA UWB • Impulse radio (IR) UWB A train of short duration (sub-nanosecond) pulses with a low duty cycle One information symbol

  5. Advantages of UWB (1/2) For AWGN channels • High data rate: Large bandwidth increases capacity • Low power/cost: Simple transceiver architectures with low power consumption are possible

  6. Advantages of UWB (2/2) Time=T1 Transmitted Signal Object Radar Transceiver • Precise position estimation (localization): High time resolution Time=T2 Reflected Signal Device Object Range = 0.5(T2-T1)cc : Speed of light 15 m • Penetration through obstacles: Large frequency band facilitates penetration through objects • Low probability of detection: Similar to white noise for other systems http://www.radarvision.com

  7. Applications (1/2) • Communications • High data rate: e.g. wireless USB, WPAN • Low data rate: IEEE 802.15.4a, wireless sensor networks http://www.soumu.go.jp

  8. Applications (2/2) [E. M. Staderini 2002] • Radar and localization http://www.radarvision.com Other applications: e.g., thru-wall monitoring, rescue operations after an earthquake. Medical applications: e.g., non-invasive patient monitoring, respiration and heartbeat rate estimation

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