a simple overview of Utra Wide Band（超宽带）
录入：edatop.com 阅读：
图没有了，更多的Utra wide band 的资料可以到
http://bwrc.eecs.berkeley.edu/Research/UWB/default.htm
这个小组在超宽带通信这方面做了很多工作，都接近工程化了。
HOME OVERVIEW PEOPLE PUBLICATIONS LINKS
Research Overview
----------------------------------------------------------------------------
----
Ultra-Wideband: What is it?
There are many kinds of signaling that may be classified as "Ultra-Wideband"
, but what we are mainly interested in is an "Impulse Radio" (as opposed to
one based on chirps or poly-cycles.) This is essentially the mathematical d
ual of the conventional narrowband approach; where sinusoidal signals are n
arrow in frequency and "wide" over time (see Figure 1 below),
a pulse is narrow in time and wideband in frequency (Figure 2 below).
One thing to note is that a pulse necessarily spreads its energy over a wide
range of frequencies, albeit at a lower power level. This means that interf
erence issues (those caused by the pulse as well as those caused by the pres
ence of in-band sinusoids) will need to be seriously considered. The FCC has
traditionally allocated radio use to specific frequency bands, and a specia
l ruling was made recently to allow for ultra-wideband use. However, due to
the issue of interference, ultra-wideband radios have to limit their transmi
t power to lower levels, thus limiting their use to short-distance applicati
ons (or lower data rates.)
Why is Ultra-Wideband Attractive?
Two main properties of ultra-wideband make it an attractive choice for radio
implementation: capacity and simplicity. The throughput of a channel is lin
early proportional to the bandwidth, so an ultra-wideband system holds the p
romise of very high-rate communication. Additionally, as ultra-wideband is
essentially a base-band system, the analog front-end complexity is less than
that for a traditional sinusoidal radio (see Figure 3 below).
(Above is block diagram for a traditional sinusoidal radio. Below, for an u
ltra-wideband radio.)
This simplified transceiver seems to be easier to integrate (fewer component
s) and more naturally "digital" (pulse generation may be as simple as a digi
tal switch) allowing it to take advantage of the flexibility, power scaling,
and computational improvements associated with digital design.
Our Research into Ultra-Wideband
We are interested in investigating the nature of UWB communications; analyzi
ng the repercussions of undetectable and non-interfering transmissions. We a
re also engaged in modeling and exploring system architecture options and lo
oking into antenna/transceiver co-design issues (i.e. wideband matching.) In
addition, we plan to identify low power CMOS circuit techniques that addres
s the unique problems not encountered in narrowband designs and target the l
owest possible cost and size. Ultimately it is our goal to demonstrate a wor
king ultra-wideband radio prototype.
----------------------------------------------------------------------------
----
To learn more about UWB, explore some of the links below, and check out our
LINKS page to other research, companies and organizations.
----------------------------------------------------------------------------
----
A collection of links to UWB tutorials are found at http://www.palowireless
.com/uwb/tutorials.asp
in addition, the following links below are recommended:
Aether Wire & Location, Inc.'s company website contains a lot of interesting
information.
Aether Wire & Location, Inc.'s Online CDROM of UWB patents, papers, and esse
ntial books.
UWB FAQ from Multi-Spectral Solutions, Inc.
A Brief History of UWB from Multi-Spectral Solutions, Inc.
http://bwrc.eecs.berkeley.edu/Research/UWB/default.htm
这个小组在超宽带通信这方面做了很多工作，都接近工程化了。
HOME OVERVIEW PEOPLE PUBLICATIONS LINKS
Research Overview
----------------------------------------------------------------------------
----
Ultra-Wideband: What is it?
There are many kinds of signaling that may be classified as "Ultra-Wideband"
, but what we are mainly interested in is an "Impulse Radio" (as opposed to
one based on chirps or poly-cycles.) This is essentially the mathematical d
ual of the conventional narrowband approach; where sinusoidal signals are n
arrow in frequency and "wide" over time (see Figure 1 below),
a pulse is narrow in time and wideband in frequency (Figure 2 below).
One thing to note is that a pulse necessarily spreads its energy over a wide
range of frequencies, albeit at a lower power level. This means that interf
erence issues (those caused by the pulse as well as those caused by the pres
ence of in-band sinusoids) will need to be seriously considered. The FCC has
traditionally allocated radio use to specific frequency bands, and a specia
l ruling was made recently to allow for ultra-wideband use. However, due to
the issue of interference, ultra-wideband radios have to limit their transmi
t power to lower levels, thus limiting their use to short-distance applicati
ons (or lower data rates.)
Why is Ultra-Wideband Attractive?
Two main properties of ultra-wideband make it an attractive choice for radio
implementation: capacity and simplicity. The throughput of a channel is lin
early proportional to the bandwidth, so an ultra-wideband system holds the p
romise of very high-rate communication. Additionally, as ultra-wideband is
essentially a base-band system, the analog front-end complexity is less than
that for a traditional sinusoidal radio (see Figure 3 below).
(Above is block diagram for a traditional sinusoidal radio. Below, for an u
ltra-wideband radio.)
This simplified transceiver seems to be easier to integrate (fewer component
s) and more naturally "digital" (pulse generation may be as simple as a digi
tal switch) allowing it to take advantage of the flexibility, power scaling,
and computational improvements associated with digital design.
Our Research into Ultra-Wideband
We are interested in investigating the nature of UWB communications; analyzi
ng the repercussions of undetectable and non-interfering transmissions. We a
re also engaged in modeling and exploring system architecture options and lo
oking into antenna/transceiver co-design issues (i.e. wideband matching.) In
addition, we plan to identify low power CMOS circuit techniques that addres
s the unique problems not encountered in narrowband designs and target the l
owest possible cost and size. Ultimately it is our goal to demonstrate a wor
king ultra-wideband radio prototype.
----------------------------------------------------------------------------
----
To learn more about UWB, explore some of the links below, and check out our
LINKS page to other research, companies and organizations.
----------------------------------------------------------------------------
----
A collection of links to UWB tutorials are found at http://www.palowireless
.com/uwb/tutorials.asp
in addition, the following links below are recommended:
Aether Wire & Location, Inc.'s company website contains a lot of interesting
information.
Aether Wire & Location, Inc.'s Online CDROM of UWB patents, papers, and esse
ntial books.
UWB FAQ from Multi-Spectral Solutions, Inc.
A Brief History of UWB from Multi-Spectral Solutions, Inc.
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