Upload
v2brother
View
330
Download
1
Embed Size (px)
DESCRIPTION
Spread Spectrum communication based on UWB(Presented on 18-10-2010 at SCT college)
Citation preview
1
RF transmission based on Microwave
UWB
VINOD V
2
Presentation Outline
►Ultra Wide Band►Spread Spectrum►MB-OFDM►Applications►UWB radar►Wireless USB►Challenges►Conclusion
3
Ultra Wide Band
3.1 10.6
-41 dBmW/Mhz
UWB can co-exist with Narrowband systems.
4
UWB requirements
►Wider bandwidth (3.1 to 10.6 GHz)
►Low power requirements (lower than noise floor -41 dBmW/MHz)
5
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)
6
7
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
8
UWB Vs. Narrow-Band
Shot Noises.
Spread spectrum.
“Carrier-free” communication as of PN sequence modulation with “pseudo-random” (PN) code
9
Why UWB?
►Exceptional multi-path immunity
►Secure Communications
►Low interference
►No need for a license to operate
►Next generation communication
system
10
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
11
4.8
MB-OFDM System Architecture
VGA
12
13
Applications
UWB Outdoor peer-to-peer network (OPPN)
14
Downloading of video movie purchase or
rental, for example, is a very data-intensive
activity that could be enabled by UWB.
HDR WPAN
15
Aircraft Intercommunications system (AWICS)
UWB
Audio at High rate
16
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
17
►TOA (Time of Arrival) & RTD (Round Trip Delay)
►TDOA (Time Difference of Arrival)
►AOA (Angle of arrival)
By estimating.............
18
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
20
Signal processing is performed through
obtaining the pulses response with the shape
and electrical properties of pulse. 21
UWB Radars in Medicine
22
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
23
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
25
Radar cross section (RCS)
GPR GPR was deployed as a backup sensor for a large mining vehicle
26
Nicknamed SPIDER
27
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
28
guarding of objects
The output signals of the guarding sensors
QUick response Perimeter Intrusion Detection –QUPIDused to protect a perimeter from unauthorized intruders.
29
LDR UWB ECG Monitoring System
Diode non-coherent
energy detector
patient in ICU
PC @ Doctor’s cabin
30
ECG signals recovered
31
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.
33
UROOF(UWB Radio Over Optical
Fiber)
Technique for UWB WPAN Network extension.
34
35
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
37
Conclusion
UWB is a promising
technology for the Next
Generation Wireless
Systems !