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Introductory, tutorial and overview information for UWB ultra wideband
radio technologies.
What is UWB?
Ultra Wideband (UWB) systems transmit signals across a much wider
frequency than conventional systems and are usually very difficult to
detect. The amount of spectrum occupied by a UWB signal, i.e. the
bandwidth of the UWB signal is at least 25% of the center frequency.
Thus, a UWB signal centered at 2 GHz would have a minimum bandwidth of
500 MHz and the minimum bandwidth of a UWB signal centered at 4 GHz
would be 1 GHz. The most common technique for generating a UWB signal is
to transmit pulses with durations less than 1 nanosecond. Time
Domain glossary
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| Æther Wire |
The
Temporal and Spectral Characteristics of Ultrawideband Signals (PDF)
UWB White
Papers
The
Origins Of Ultra-Wideband Technology Ultra-Wideband (UWB)
Technology, also known as nonsinusoidal communication technology,
impulse radar, ground-penetrating radar, impulse radio, baseband
pulse technology, and other designations.
Pat.#5687169:
Full duplex ultrawide-band communication system and method
An impulse radio transceiver for full duplex ultrawide-band
communications. The transceiver comprises an impulse radio
transmitter to transmit impulse radio signal pulses, an impulse
radio receiver to receive impulse radio signal pulses... |
| Business Week |
Ultrawideband:
Gold in the "Garbage Frequency" (3/00) Everyone is
talking about broadband wireless these days, but few people have
heard of a new technology with thousands of potential applications:
ultrawideband. That's probably because it's not legal yet. But
that's not stopping three new companies from finding their own niche
in the as yet nonexistent market. Time Domain Inc., US Radar Inc.,
and Zircon Corp. were all granted exclusive waivers by the Federal
Communications Commission earlier this year to begin marketing their
version of ultrawideband technology on a limited basis to test its
safety and effects. Provided the government approves ultrawideband
this year -- a likely prospect -- these companies, which the FCC
chose based on their distinctive and nonoverlapping markets, will
soon offer products using signals, or pulses, that don't fit into
any one part of the spectrum. That will give them access to
unlicensed, free air space. |
| CommsDesign |
Why
Such Uproar Over Ultrawideband? (3/02) Low power, low cost, high
data rates, precise positioning capability and no interference--UWB
seems to have it all. But how does it do that? Ultrawideband (UWB)
has been described by some as one of the most promising technologies
of our times. Early UWB systems were developed mainly as a military
surveillance tool because they could "see through" trees
and beneath ground surfaces. Only recently, however, has UWB
technology focused on consumer electronics communications. To fully
appreciate the potential of UWB in these applications, it is
essential for the designer to firmly grasp the unique
characteristics of this form of wireless transmission. For this, we
will look at UWB fundamentals and at some of the different types of
modulation and coding schemes used by UWB systems. We will then
discuss the basic building blocks of a UWB system optimized for
streaming digital video and audio in consumer-oriented entertainment
products. |
| ITS |
NTIA
Report 01-384: Measurements to Determine Potential Interference
to GPS Receivers from Ultrawideband Transmission Systems. |
| Multispectral
Solutions, Inc (MSSI) |
UWB
FAQ Frequently Asked Questions about Ultra Wideband (UWB)
technology... What is ultra wideband technology? What are the
advantages of UWB technology? What are some of its disadvantages?
... |
| RFDESIGN |
Direct-sequence
UWB signal generation and measurement Ultra-wideband (UWB) radio
signals have characteristics that are different from conventional
radios. Of special interest is the ability to spread the
transmission power over a sufficiently wide bandwidth to make the
signal appear as noise to a narrowband receiver, while still being
able to transmit very high data rates over short distances. In this
context “narrowband” may actually mean 20 MHz wide. A direct
(baseband) pulsed approach, using today's ultrahigh-speed digital
circuitry, was originally seen as the most direct route for UWB
radio implementation... |
| Scientific American |
Wireless
Data Blaster Radio's oldest technology is providing a new way
for portable electronics to transmit large quantities of data
rapidly without wires. The high-speed data-transfer capabilities of
UWB systems have spurred a group of inventors and entrepreneurs to
promote this short-range technology as a nearly ideal way to handle
the burgeoning flow of wireless information among networks of
portable (battery-powered) electronic devices. |
| SSS
Online |
All
About UWB Communications from SSS Online Ultra Wideband
Technology is Making BIG Waves! |
| UWB Forum |
Technical
FAQ
Q1. Do we really need yet another wireless technology?
Q2. What is Ultra-wideband (UWB)?
Q3. What is IEEE 802.15.3 and 802.15.3a?
Q4. What is the MultiBand OFDM Alliance?
Q5. What is CSM?
Q6. Why CSM?
Q7. What are the advantages and drawbacks of UWB technology?
Q8. What are the potential commercial applications?
Q9. When do you predict we'll have the first multimedia products on
the market with UWB inside?
Q10. How different is UWB from other WLAN/WPAN technologies?
Q11. What about Bluetooth?
Q12. How much would a product with UWB cost versus one without it or
with a competing wireless technology?
Q13. How much would a product with CSM cost versus one without it or
with just one alternate UWB PHY?
Q14. What is the level of interference caused by an ultra-wideband
system?
Q15. How do you implement channelization or "multiple piconets"
with UWB?
Q16. Is UWB a replacement for wireless LAN? Or isn't it powerful
enough for those types of applications? |
| Wireless Design
Online |
UWB
Takes Aim At WLANs (3/01) As wireless local area networks (WLANs)
get ready to expand to 5-GHz (see WLANs Prepare to Jump to 5GHz),
ultrawideband (UWB) technology is demonstrating some great potential
in this space. The US Federal Communications Commission (FCC) began
the UWB approval process in 1998, and it is awaiting final results
from National Telecommunications and Information Administration (NTIA)
on some interference issues. It seems that UWB is likely to be
approved some time this year for commercial deployment in the US.The
primary applications for UWB technology are radar, location sensing,
and communications. UWB signals are generated using short,
video-like pulses that are transmitted over a wide range of
spectrum. |
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