Ultra Wide Band (UWB) Spread Spectrum

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RF transmission based on Microwave

UWB

VINOD V

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Presentation Outline

►Ultra Wide Band►Spread Spectrum►MB-OFDM►Applications►UWB radar►Wireless USB►Challenges►Conclusion

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Ultra Wide Band

3.1 10.6

-41 dBmW/Mhz

UWB can co-exist with Narrowband systems.

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UWB requirements

►Wider bandwidth (3.1 to 10.6 GHz)

►Low power requirements (lower than noise floor -41 dBmW/MHz)

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spread spectrum communication

Low energy, short duration UWB pulses.Microwave Spectrum controlled by BPF impulse response.

UWB Modulation Schemes

►1. PPM (Pulse Position Modulation)

►2. OOK (On Off Keying)

►3. BPSK (Binary Phase Shift Keying)

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Fact Sheet

►110 Mbps high data rate as of wide band

►Delivers data over 15 to 100 meters(WPAN) as of low power

►Low Complexity, Low Cost

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UWB Vs. Narrow-Band

Shot Noises.

Spread spectrum.

“Carrier-free” communication as of PN sequence modulation with “pseudo-random” (PN) code

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Why UWB?

►Exceptional multi-path immunity

►Secure Communications

►Low interference

►No need for a license to operate

►Next generation communication

system

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Multiband-OFDM

Divides the available UWB frequency

spectrum (3.1 GHz to 10.6 GHz) into

multiple smaller and non-overlapping

bands with bandwidths greater than 500

MHz.

MB-OFDM

4.8

528 MHz Bandwidth for each band

13Band plan

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4.8

MB-OFDM System Architecture

VGA

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Applications

UWB Outdoor peer-to-peer network (OPPN)

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Downloading of video movie purchase or

rental, for example, is a very data-intensive

activity that could be enabled by UWB.

HDR WPAN

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Aircraft Intercommunications system (AWICS)

UWB

Audio at High rate

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The wide bandwidth of UWB signals

implies a fine time resolution that

gives them a potential for high-

resolution positioning applications

/Localization and tracking (LT)/ranging,

provided that the multipaths are dealt

with.

UWB RADARS

Components of UWB Radar►small scale environment(piconet)

►UWB TaG/mobile device (MD)/sensor –TX

►UWB slave access poinT(AP)/STATIONARY UNIT/RFD –TX_RX

►Digital processing unit/master ap/FFD

►Pc as secondary processing unit

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►TOA (Time of Arrival) & RTD (Round Trip Delay)

►TDOA (Time Difference of Arrival)

►AOA (Angle of arrival)

By estimating.............

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Three Principles of Positioning

UWB radar monitoring of the level of a liquid

• tank PICONET

• Liquid as UWB TaG/sensor

• AP –TX_RX

• Digital processing unit/master ap WITH PC 19

UWB Radars in Medicine

UWB radar monitor

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Signal processing is performed through

obtaining the pulses response with the shape

and electrical properties of pulse. 21

UWB Radars in Medicine

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UWB Radars in Medicine

UWB radar emissions are safe and the UWB electromagnetic signal is not influenced by clothes or blankets.

UWB radar-based exploration of arteries

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through-wall detection UWB radar

20cm

GPR- Ground Penetrating Radar24

Here strongest clutter signal occurs by reflection from a wall

and the weakest expected reflection from a target at the

maximal range.

As key functional requirements to the radar we select the

separation of a breathing target from a stationary clutter.

R11m

R3

1GHz

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Radar cross section (RCS)

GPR GPR was deployed as a backup sensor for a large mining vehicle

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Nicknamed SPIDER

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GPR system block diagram

vehicular collision avoidance

In this application, an approaching car is

detected by using SRR as well as delivery of

warning messages by wireless communication

from the approaching car.

Unmanned Vehicles

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guarding of objects

The output signals of the guarding sensors

QUick response Perimeter Intrusion Detection –QUPIDused to protect a perimeter from unauthorized intruders.

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LDR UWB ECG Monitoring System

Diode non-coherent

energy detector

patient in ICU

PC @ Doctor’s cabin

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ECG signals recovered

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Wireless USB

Under the WiMedia umbrella, industry

incorporated UWB as the technology

to achieve high data rates up to 480

Mbps for Wireless USB. 32

WUSB enabled DVDPC with WUSB adapter

Bluetooth over Ultra Wideband (BToUWB)

BToUWB is modeled by channeling an existing compliant

Bluetooth

connection’s data over a software implemented UWB

Medium Access Control (MAC) and simulated Physical

(PHY) layer radio channel.

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UROOF(UWB Radio Over Optical

Fiber)

Technique for UWB WPAN Network extension.

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UWB AND THE COMPETING TECHNOLOGIES

CHALLENGES TO UWB ► suspicious about the NB interference

► extreme antenna bandwidth requirements

► very accurate timing synchronization need for correlator -

based receiver

► Complex RAKE-type receiver to cope with significant

amount of energy in the multipath

► filter matching accuracy

► timely approval from the regulatory bodies

► lack of an universal standard36

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Conclusion

UWB is a promising

technology for the Next

Generation Wireless

Systems !