Location:Home > TURBO GARRETTS > Turbo T SERIES 11 > PPT ULTRA WIDEBAND PowerPoint presentation

PPT ULTRA WIDEBAND PowerPoint presentation

Time:2018-04-02 03:01Turbochargers information Click:

free f Cell Phone Tracking

About This Presentation

Title:ULTRA WIDEBAND

Description:

Carrier-free. Super wideband. Ultrahigh resolution ... Cell phone companies. Department of Defense. Baby monitor companies. IEEE802 STANDARD ACTIVITIES ... – PowerPoint PPT presentation

Number of Views:2566

Avg rating:3.0/5.0

Slides: 91

Provided by: sooyoun

Category:

Tags: Add more tags

Write a Comment

User Comments (0)

Latest

Sort by:

Page of

Transcript and Presenter's Notes


Title: ULTRA WIDEBAND


1
ULTRA WIDEBAND

Soo-Young Chang


2
TABLE OF CONTENTS

Introduction

Mathematical backgrounds

Channel characteristics

Optimal baseband waveforms

Modulation schemes

Multiple access techniques

Detection

Synchronization

Antenna

Transmitter structure

Receiver structure

MAC layer

UWB networking

Performance evaluation

Future research issues


3
INTRODUCTON
4
DEFINITION

Bandwidth more than 20 of carrier frequency or
more than 0.5 GHz (defined by FCC)

Very short duration pulses less than a few nsec
transmitted typically less than 1 nsec


5
UWB RADIO

Impulse

Time domain

Non-sinusoidal

Baseband

Video pulse

Carrierless

Carrier-free

Super wideband

Ultrahigh resolution


6
HISTORY

Radar history


7
ULTIMATE GOAL OF WIRELESS COMM.

Goal of Generic wireless

Amount of information a lot of data

Range very far

Data rate very fast

No. of users for many users

Real time all at once

Trend short range wireless

favor for freq reuse

UWB

Amount of information a lot of data

Range very small

Data rate very fast

No. of users for many users

Real time all at once

wired infrastructure

growth of high- speed wired


8
UWB BASIC CHARACTERISTICS

Ultra wide Bandwidth

Energy bandwidth (BE)

Percent bandwidth contains 99 power

Proportional bandwidth

Time-bandwidth product (TB) for practical
example, IS-95 has around 0.5, and for CDMA2000
and WCDMA numbers between 0.5 and 1.0 are
proposed

Fractional bandwidth

Relative bandwidth

Narrowband conventional comm

wideband 3G cellular technology

ultra wideband wide bandwidth and carrierless


9
UWB BASIC CHARACTERISTICS

High spatial capacity bits/sec/m2

Low power portable device needed

802.11b Bluetooth 802.11a UWB

range (m) 100 10
50 10

BW (MHz) 80 200
7500

data rate (Mbps) 11 1
54 110

spatial cap (b/s/m2) 1,000 30,000
83,000 2,000,000

All systems are bounded by the channel capacity
which says that the capacity increases linearly
with bandwidth but only logarithmically with S/N.

? None can not reach the speed of UWB.

C B log (1 S/N)


10
UWB BASIC CHARACTERISTICS

Relatively simple in transceiver architecture

Transmitter pulse generator antenna

Receiver antenna LNA receiver (matched
filter or correlator) detector

no power amp, no transmit filter, no VCO, no
mixer, no PLL, no ref osc. etc

Low cost and power consumption

Simple hardware entails low cost

Due to low semiconductor cost and power
consumption for signal processing

makes UWB technology practical


11
UWB BASIC CHARACTERISTICS

LOW PROBABILITY OF INTERCEPT (LOI)


12
CHARACTERISTICS FOR UWB COMM.

Very low power level below kT thermal noise level

Short duration pulse less than 1 nsec

Ultra wide bandwidth larger than 20 of carrier
frequency

High data rate achieved higher than 110 Mbps

High processing gain the ratio of the RF
bandwidth of the signal to the information
bandwidth of the signal

For ex., 7.5 GHz channel bandwidth with 100 MHz
information bandwidth has a processing gain of
75.

The duty cycle of the transmission of 1 yields
a processing gain of 100 (20 dB)

Low probability of intercept and detection

Low-cost digital signal processing hardware is
often used in modern digital radios to generate
several modulation methods These systems can
step down the information density in their signal
to serve users at greater distances (range)

A UWB radio can use several pulses to send one
information bit thereby increasing SNR in the
receiver

Under software control, the UWB system can
dynamically trade date rate, power consumption,
and range.

Enable the power constrained portable computing
applications of the future.


13
ADVANTAGES OF UWB OVER NARROWBAND

Potential advantages

Low cost, low power simple implementation

Carrierless, direct baseband signal

Low duty cycle operation

Potential for high capacity high throughput

Large effective processing gain

Share the spectrum with many users

Low noise power spectral density

Improved co-existence

Ideally no frequency planning

Good propagation quantities

Multipath resistant, cm location

High penetration (high BW, low freq.)

Fine time resolution

Potential issues

Regulatory

Limits, thresholds, bands

Noise aggregation issues

Wireless internet connectivity issues

Lack of standards

In development, but lengthy process

Utility not clear in all cases

Performance and implementation

Synch., jitter, sampling, etc.

Susceptibility to interference

Short range (a few meters to a few km)

Low power direct pulse operation

Low antenna transmit efficiency (BW-1/QF)

Amount of digital computation


14
UWB vs SPREAD SPECTRUM

Both tech for spectrum spread

Direct sequence

Frequency hopping

Pulsed-FM or chirp

Time hopping


15
CHALLENGES FOR UWB REALIZATION

Regulatory issues

Finding a way to make the technology legal
without causing unacceptable interference to
other users that share the same frequency bands

Power efficient and low cost implementation

Fulfillment of spectral mask, but full
exploitation of allowed power Interference
suppression

Technique which adaptively suppress interference
from other systems


16
CHALLENGES IN TECHNICAL AREAS

Susceptible to being unintentionally jammed by
traditional narrowband transmitter

Filter matching accuracy FOER01

Extreme antenna bandwidth requirements

Accurate timing synchronization for a
correlated-based receiver due to short pulse
durations

Amount of energy in the multipath components
caused by reflections in the channel Rake
receiver is a candidate

Noise from on-board microcontroller


17
GOALS FOR UWB IMPLEMENTATION

Fulfillment of spectral mask, but full
exploitation of allowed power. Interference
suppression

Cheap implementation

Robustness to multipath

Scalability


18
UWB PHY LAYER COMPONENTS

Transmitter

Source coding / channel coding

Pulse generation

Code sequence generation for multiple access

Modulation

Power control

Antenna

Receiver

Low noise amplifier

Synchronization detection

Demodulation

Cross correlation detection (using template) or
matched filtering

Channel decoding / source decoding


19
UWB MAC LAYER COMPONETS

Initially 802.15.3 MAC protocol is to be applied.

UWB MAC questions

Are standard MAC protocols applicable to UWB
(e.g., 802.15.3 and 802.11b)?

What, if any, UWB specific features may be
required within the MAC?

Can the UWB MAC facilitate co-existence with
other systems (e.g., WLAN and 802.16)?

MAC design considerations

Scalability of personal operating space based on
UWB localization

Improved co-existence with other systems

Reduced power consumption

Scalability in terms of range and throughput
trades

PRF and peak power can vary inversely providing
for constant average power

This enables signaling of different data rates on
a per packet or link basis based on the range
FOER

Synchronization of received packets at different
receivers

Receivers in a multicast network based on UWB
localization FOER


20
UWB APPLICATIONS

Radar

Passive target identification

Target imaging and discrimination

Signal concealment from electronic warfare and
anti-radiation missile

Detection or remote sensing

Ground penetration radar

Locating

Communications


21
UWB APPLICATIONS FOR COMM

Home

Entertainment

Proximity detectors

Tracking

Industrial

Automotive

Military

Law enforcement/rescue


22
FCC ACTIVITIES

NOI (Notice of Interest) Sep. 1998

Ask feedback from the industry regarding the
possibility of allowing UWB emission on an
unlicensed basis following power restrictions
described in the FCC Part 15 rules.

More than 500 comments have been filed.

P E2 4 R2 /

where P emitted power (W)

E electric field strength (V/m)

R radius of the sphere (m)

characteristic impedance of a vacuum (377
ohms)

NPRM (Notice of Proposed Rule Making) May 2002

Ask feedback from the industry on specific rule
changes that could allow UWB emitters under the
Part 15 rules.

First RO (Report and Order) Feb. 2002

Frequency assignments 3.1 10.6 GHz

Frequency mask indoor and outdoor


23
FCC MASK

Factors which affect how UWB impacts other
narrowband systems

Separation between the devices

Channel propagation losses

Duty cycle

Modulation techniques

Pulse repetition frequency (PRF) employed by the
UWB system

Receiver antenna gain of the narrowband receiver
in the direction of UWB transmitter

Three types of UWB devices

Imaging systems (medical, surveillance, ground
penetrating radar) which may operate either below
960 MHz or between 1.99 and 10 GHz

Vehicular radar systems (above 24.075 GHz)

Communications and measurements systems
restricted to

Indoor networks or hand-held devices working on a
peer-to-peer basis

Operating between 3.1 to 10.6 GHz, FCC 15 rules
applied (limits)

FCC mask

ETSI limits are expected to be similar SORENSEN


24
FCC MASK (contd)
25
FCC FREQUENCY ASSIGNMENT

Feb. 2002

Assigned frequency band of 3.1 -10.6 GHz 7.5 GHz
Bandwidth

To be deployed on an unlicensed basis following
the Part 15.209 rules for radiated emissions of
intentional radiators

With frequency mask which constrains the transmit
power


26
OPPONENTS

Airlines

GPS

Cell phone companies

Department of Defense

Baby monitor companies


27
IEEE802 STANDARD ACTIVITIES

IEEE802 standards for LAN/MAN

IEEE802.15 WPAN (Wireless Personal Area
Networks)

Deals with short range comm. Including Bluetooth

IEEE802.15.3 high rate short range
communications up to 55 Mbps

IEEE802.15.3a task group for alternate PHY for
high rate short range communications higher than
110 Mbps

IEEE802.18 coexistence between wireless
applications currently study coexistence between
802.11 802.15.3a


28
IEEE802.15.3a

For alternate PHY for high rate WPAN (802.15.3)

Date rate Higher than 110 Mbps up to 480 Mbps
(possibly 1 Gbps)

Key Applications multimedia and imaging

PHY UWB

MAC modified IEEE15.3 MAC

Became a formal task group (TG) in Jan. 2003

Leading companies

Copyright infringement? Click Here!