suchitav.com

ultra wide band


UWB is an exciting new technology that creates a world of opportunities for new wireless applications. UWB technology transmits information by generating radio energy at specific time instants over a large bandwidth. Focus Enhancements’ UWB technology delivers the wireless bandwidth to effortlessly move large data files and enriched digital media from one location in a home or office to another. The high data rates offered through UWB technology comply with WiMedia Alliance and ECMA-368/369 international UWB standards. WiMedia is an industry association that establishes Ultra Wideband standards.
Wireless USB Technology

Certified Wireless USB specifications from the USB-IF is the new wireless extension to USB technologies. Wireless USB, Focus Enhancements’ first significant application of UWB technology, combines the speed of USB 2.0 with the convenience of wireless technology. The video clip above reveals the tremendous advancement Wireless USB brings to the world of connectivity.

Certified Wireless USB technology is well suited for a variety of consumer electronics, including PCs, printers, high-definition television (HDTV), media centers/servers, personal video recorders like TiVo?, digital cameras, digital video camcorders, DVD recorders, cell phones, large-memory personal digital assistants and external network hard drives.
Comparison between Ultra-Wideband and Narrowband Transceivers
Ultra-Wideband (UWB) Definition and information
An Introduction to Ultra Wideband
A Technology to Consider: Ultrawideband

UWB design papers free download
System Design Considerations for Ultra-Wideband Communication, David D. Wentzloff e.a., MIT, research Communications Magazine August 2005
Impulsive Kanalstörungen und deren Einfluss in der ultrabreitbandigen Übertragung, Vom Fachbereich Ingenieurwissenschaften der Universität Duisburg-Essen PHD Dissertation, Youssef Dhibi, in German. style= Juny 2005.
Transceiver Design for Ultra-Wideband Communications, Aaron Michael Orndorff MSc. Thesis Virginia Polytechnic Institute and State University, May 20, 2004, Blacksburg, VA
Recent Applications of Ultra Wideband Radar and Communications Systems, Dr. Robert J. Fontana, President Multispectral Solutions, Inc. Gaithersburg, Maryland USA.
Modulation, Coding and RF Components for Ultra-Wideband Impulse Radio, PHD Thesis, David C. Laney, UNIVERSITY OF CALIFORNIA, SAN DIEGO 2003.

Good reserach papers free download

Lee, F. S., A. P. Chandrakasan, “A BiCMOS Ultra-Wideband 3.1-10.6GHz Front-End,” research Journal of Solid-State Circuits, August 2006, download

D. D. Wentzloff , A. P. Chandrakasan, “Gaussian Pulse Generators for Subbanded Ultra-Wideband Transmitters,” research Transactions on Microwave Theory and Techniques download

R. Blazquez, P. P. Newaskar, F. S. Lee, A. P. Chandrakasan, “A baseband processor for impulse ultra-wideband communications,” research Journal of Solid-State Circuits, download


David D. Wentzloff, Raul Blazquez, Fred S. Lee, Brian P. Ginsburg, Johnna Powell, Anantha P. Chandrakasan, “System Design Considerations for Ultra-Wideband Communication,” research Communications Magazine, download

Wentzloff, D.D. and Chandrakasan, A.P., “Delay-Based BPSK for Pulsed-UWB Communication,” research International Conference on Speech, Acoustics, and Signal
download | poster download
Lee, F.S. and Chandrakasan, A.P., “A 2.5nJ/b 0.65V 3-to-5GHz Subbanded UWB Receiver in 90nm CMOS,” research International Solid-State Circuits Conference, February 2007, pp. 116-117.
download download
Wentzloff, D.D. and Chandrakasan, A.P., “A 47pJ/pulse 3.1-to-5GHz All-Digital UWB Transmitter in 90nm CMOS,” research International Solid-State Circuits Conference, February 2007, pp. 118-119.
download download

Lee, F.S., Blazquez, R., Ginsburg, B.P., Powell, J.D., Scharfstein, M., Wentzloff D.D., and Chandrakasan, A.P., “A 3.1 to 10.6 GHz 100 Mb/s Pulse-Based Ultra-Wideband Radio Receiver Chipset,” research International Conference on Ultra-Wideband, September 2006, pp. 185-190.
download
Ginsburg, B.P., A.P. Chandrakasan, “A 500MS/s 5b ADC in 65nm CMOS,” research Symposium on VLSI Circuits
download download
Sze, V., R. Blazquez, M. Bhardwaj, A. Chandrakasan, “An Energy Efficient Sub-Threshold Baseband Processor Architecture For Pulsed Ultra-Wideband Communications,” research International Conference on Acoustics, Speech and Signal Processing, May 2006, pp. 908-911.
download download

Ginsburg, B. P., A. P. Chandrakasan, “Dual Scalable 500MS/s, 5b Time-Interleaved SAR ADCs for UWB Applications,” research Custom Integrated Circuits Conference, September 2005, pp. 403-406.
download download
Lee, F. S., A. P. Chandrakasan, “A BiCMOS Ultra-Wideband 3.1-10.6GHz Front-End,” research Custom Integrated Circuits Conference, September 2005, pp. 153-156.
download download
David D. Wentzloff, Anantha P. Chandrakasan, “A 3.1-10.6 GHz Ultra-Wideband Pulse-Shaping Mixer,” research Radio Frequency IC Symposium, June 2005, pp. 83-86.
download download
Brian P. Ginsburg, Anantha P. Chandrakasan, “An Energy-Efficient Charge Recycling Approach for a SAR Converter with Capacitive DAC,” research Symposium on Circuits and Systems, May 2005, pp. 184-187.
download PDF
R. Blazquez, A. P. Chandrakasan, “Architectures for energy-aware impulse UWB communications,” research International Conference on Acoustics, Speech and Signal Processing, March 2005, pp. 18-32.
download download
Raul Blazquez, Fred S. Lee, David D. Wentzloff, Brian Ginsburg, Johnna Powell, Anantha P. Chandrakasan, “Direct Conversion Pulsed UWB Transceiver Architecture,” Design, Automation and Test in Europe, March 2005, pp. 94-95.
download PDF

Raul Blazquez, Puneet P. Newaskar, Fred S. Lee, Anantha P. Chandrakasan, “A Baseband Processor for Pulsed Ultra-Wideband Signals”, research Custom Integrated Circuits Conference, October 2004, pp. 587-590.
download PDF
Johnna Powell, Anantha P. Chandrakasan, “Spiral Slot Patch Antenna and Circuilar Disc Monopole for Ultra Wideband Communication”, 2004 International Symposium on Antennas and Propagation, August 2004.
download PDF
Johnna Powell, Anantha P. Chandrakasan, “Differential and Single Ended Elliptical Antennas for 3.1-10.6 GHz Ultra Wideband Communication”,research Antennas and Propagation Society International Symposium, June 2004, pp. 2935-2938.
download PDF
Fred S. Lee, David D. Wentzloff, Anantha P. Chandrakasan, “An Ultra-Wideband Baseband Front-End”, research Radio Frequency IC Symposium, June 2004, pp. 493-496.
download

2003

Raul Blazquez, Fred S. Lee, David D. Wentzloff, Puneet P. Newaskar, Johnna D. Powell, Anantha P. Chandrakasan, “Digital architecture for an ultra-wideband radio receiver”, Vehicular Technologies Conference, October 2003, pp. 1303-1307.
download download
Raul Blazquez, Puneet P. Newaskar, Anantha P. Chandrakasan, “Coarse acquisition for ultra-wideband radio receivers”, research International Conference on Acoustics, Speech and Signal Processing, April 2003, pp. 137-140.
download

2002

Puneet P. Newaskar, Raul Blazquez, Anantha P. Chandrakasan, “A/D precision requirements for an ultra-wideband radio receiver”, SIPS 2002, October 2002, pp. 270-275.
download

Theses

Follow this link for student theses.
Exact Image Theory for Ultra Wideband Pulse Reflection, MSc. Thesis, Miroslava Raspopovic, ECE, 2003.
Frequency diversity performance of coded multiband-OFDM systems on research UWB channels, Matts-Ola Wessman, Arne Svensson, and Erik Agrell, Proc. research Vehicular Technology Conference, L.A. Sept. 2004.
Design and performance of carrier-based DS-SS systems on research 802.15.3a UWB channels, Matts-Ola Wessman, Arne Svensson, and Erik Agrell, submitted to research Transactions on Microwave Theory and Techniques, Special Issue on Ultra-Wideband, Aug. 2005.
Using FDTD approach in Modeling UWB Radio wave Propagation and objects detection behind walls, Peter Y Lee, PHD Thesis, STEVENS INSTITUTE OF TECHNOLOGY March 2005.
A NEW ULTRA-WIDEBAND ANTENNA FOR UWB APPLICATIONS Seok H. Choi e.a., Korea, August 2003.
Characterisation of an Aperture-Stacked Patch Antenna for Ultra-Wideband Wearable Radio Systems, Maciej Klemm, Gerhard Troester, JOURNAL OF TELECOMMUNICATIONS AND INFORMATION TECHNOLOGY 2005.
Differential and Single Ended Elliptical Antennas for 3.1-10.6 GHz Ultra Wideband Communication, Johnna Powell* and Anantha Chandrakasan MIT.
Modeling Omnidirectional Small Antennas for UWB Applications’ Stanley Bo-Ting Wang*, Ali M. Niknejad and Robert W. Brodersen, University of California, research Symposium on Antennas and Propagation, June 2004.
RF front-end considerations for SDR ultra-wideband communications systems , Design an efficient RF front-end for a novel’ Stéphane Paquelet , Christophe Moy and Louis-Marie Aubert, RFDesign, July 2004.
Short-Range High-Speed Ultra Wideband Communications, Jian Zhang, September 2004, PHD thesis, The Australian National University.
A Subsampling UWB Radio Architecture by Analytic Signaling, M. S.W. Chen, R. W. Brodersen, ICASSP,May 2004
System Design and Performance Analysis of an Ultra-wideband based Low Data Rate Wireless Personal Area Network, Jaouhar Ayadi,John Gerrits, Patrick vaney, Andreas A. Hutter,John Farserotu, CSEM 2003
Wavelet generation circuit for UWB impulse radio applications, J.F.M. Gerrits and J.R. Farserotu, ELECTRONICS LETTERS 5th December 2002 Vol. 38 No. 25
A Wideband Equivalent SPICE Circuit for a Monopole Antenna and its Usefulness for UWB Applications. lang=FR style= color:black;mso-ansi-language: FR’>John Gerrits e.a. Centre Suisse d’Electronique et de Microtechnique SA (CSEM), EUMW 2003
Short-Range UWB Radio Propagation Investigations Using Small Terminal Antennas, István Z. Kovács and Patrick C.F. Eggers, INTERNATIONAL WORKSHOP ON ULTRA WIDEBAND SYSTEMS, OULU, FINLAND, 2. -4. JUNE 2003.
Performance of Ultra-Wideband Communications in the Presence of Interference, Li Zhao, Alexander M. Haimovich, JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 20, NO. 9, DECEMBER 2002.
Performance of Coherent Receivers for a Pulsed Multiband UWB Transceiver, Henry Yonas Djamianto, Thesis, Department of Signals and Systems, Chalmers University of Technology, Sweden 2004
Characterization of UWB Propagation from 2 to 8 GHz in a Residential Environment
Abstract by Leslie Rusch, Cliff Prettie, David Cheung, Qinghua Li, and Minnie Ho, Intel Corporation, Intel Research Labs.
Design Challenges for Very High Data Rate UWB Systems
Abstract by V. Srinivasa Somayazulu, Jeffrey R. Foerster, and Sumit Roy, Intel Labs.
Direct-Sequence UWB Signal Generation and Measurement
Article in RF Design Magazine, By Peter Cain.
Extreme UWB
One-stop-shop for serious technological needs, from Ziff Davis.
Infineon to Enter Ultra-Wideband Market with Industry’s First Dual-Band RF-CMOS Transceiver Core – Paving the Way for the Converged Entertainment Cell Phone

Article from Semiconductor Applications.

Live from CeBIT: Ultra-Wideband (UWB) is here…almost
Article from Engadget by Thomas Ricker.
Low-Power, Miniature, Distributed Position Location and Communication Devices Using
Ultra-Wideband, Nonsinusoidal
Communication Technology
Semi-Annual Technical Report by Æther Wire Location, Inc.
Making USB Without Wires Work for Consumers
Article from Wireless Net DesignLine, by Calvin Harrison, Freescale Semiconductor.
Measurements to Determine Potential Interference to GPS Receivers from Ultrawideband Transmission Systems
Abstract describing laboratory measurements of Global Positioning System (GPS) receiver vulnerability to ultrawideband (UWB) interference.
Multiple Access Performance in UWB Systems using Time Hopping vs. Direct
Sequence Spreading
Abstract by V. Srinivasa Somayazulu Intel Labs.
Multiuser Receivers for DS-CDMA UWB
Abstract by Qinghua Li, Leslie A. Rusch Intel Corporation, Intel Labs.
Performance Comparisons Between a RAKE Receiver and a Differential Detector for an Ultra-wideband Communications System
Article by Jeff Foerster, Minnie Ho, V. Srinivasa Somayazulu, and Sumit Roy, Intel Labs.
Revision of Part 15 of the Commission’s Rules Regarding Ultra-Wideband Transmission Systems
From the Federal Communications Commission.
Spatial Correlation of UWB Signals in a Home Environment
Abstract by Cliff Prettie, David Cheung, Leslie Rusch, and Minnie Ho, Intel Corporation, Intel Labs.
Spectrum Allocations for Ultra Wide Band Technology
The Effects of Multipath Interference on the Performance of UWB Systems in an Indoor Wireless Channel
Abstract by Jeffrey R. Foerster, Intel Architecture Labs.
The Origins of Ultra-Wideband Technology
Compiled by Æther Wire Location, Inc.
The Temporal and Spectral Characteristics of Ultrawideband Signals
Report by William A. Kissick, U.S. Department of Commerce.
U.C. Berkeley UWB Group
The goal of this research group to investigate the design of UWB transceivers realized in a conventional CMOS technology.
Ultrawideband: Gold in the Garbage Frequency”
News analysis from Business Week online.

Ultrawideband Planet.com
Ultrawideband business technology news information.

Ultra-Wideband (UWB) Technology
White paper from Intel.

Ultra-Wideband (UWB) Technology – One Step Closer to Wireless Freedom
From Intel.

USB Without Wires: Understanding Different Approaches Using Ultra-Wideband Technology
White paper from Freescale Semiconductor.

UWB Forum
Comprised of over 100 companies committed to making Ultra-Wideband technology a reality, facilitates the worldwide regulatory approval process for Ultra-Wideband systems along with the market educational efforts for future customers of these technologies.

UWB Standards Body Gives Up
Article from Spread Spectrum Scene.

UWB Takes Aim At WLANs
From Wireless Design Online, by Janine Sullivan.
Why Such Uproar Over Ultrawideband?

Ultra-Wideband (UWB) is a technology for transmitting information spread over a large bandwidth (>500 MHz) that should, in theory and under the right circumstances, be able to share spectrum with other users. Regulatory settings of FCC are intended to provide an efficient use of scarce radio bandwidth while enabling both high data rate “personal area network” (PAN) wireless connectivity and longer-range, low data rate applications as well as radar and imaging systems.citations needed
Ultra Wideband was traditionally accepted as pulse radio, but the FCC and ITU-R now define UWB in terms of a transmission from an antenna for which the emitted signal bandwidth exceeds the lesser of 500 MHz or 20% of the center frequency. Thus, pulse-based systems—wherein each transmitted pulse instantaneously occupies the UWB bandwidth, or an aggregation of at least 500 MHz worth of narrow band carriers, for example in orthogonal frequency-division multiplexing (OFDM) fashion—can gain access to the UWB spectrum under the rules. Pulse repetition rates may be either low or very high. Pulse-based UWB radars and imaging systems tend to use low repetition rates, typically in the range of 1 to 100 megapulses per second. On the other hand, communications systems favor high repetition rates, typically in the range of 1 to 2 giga-pulses per second, thus enabling short-range gigabit-per-second communications systems. Each pulse in a pulse-based UWB system occupies the entire UWB bandwidth, thus reaping the benefits of relative immunity to multipath fading (but not to intersymbol interference), unlike carrier-based systems that are subject to both deep fades and intersymbol interference.

A significant difference between traditional radio transmissions and UWB radio transmissions is that traditional systems transmit information by varying the power level, frequency, and/or phase of a sinusoidal wave. UWB transmissions transmit information by generating radio energy at specific time instants and occupying large bandwidth thus enabling a pulse-position or time-modulation. The information can also be imparted (modulated) on UWB signals (pulses) by encoding the polarity of the pulse, the amplitude of the pulse, and/or by using orthogonal pulses. UWB pulses can be sent sporadically at relatively low pulse rates to support time/position modulation, but can also be sent at rates up to the inverse of the UWB pulse bandwidth. Pulse-UWB systems have been demonstrated at channel pulse rates in excess of 1.3 giga-pulses per second using a continuous stream of UWB pulses (Continuous Pulse UWB or “C-UWB”), supporting forward error correction encoded data rates in excess of 675 Mbit/s.1 Such a pulse-based UWB method using bursts of pulses is the basis of the research 802.15.4a draft standard and working group, which has proposed UWB as an alternative PHY layer.
One of the valuable aspects of UWB radio technology is the ability for a UWB radio system to determine “time of flight” of the direct path of the radio transmission between the transmitter and receiver at various frequencies. This helps to overcome multi path propagation, as at least some of the frequencies pass on radio line of sight. With a cooperative symmetric two-way metering technique distances can be measured to high resolution as well as to high accuracy by compensating for local clock drifts and stochastic inaccuracies.

Another valuable aspect of pulse-based UWB is that the pulses are very short in space (less than 60 cm for a 500 MHz wide pulse, less than 23 cm for a 1.3 GHz bandwidth pulse), so most signal reflections do not overlap the original pulse, and thus the traditional multipath fading of narrow band signals does not exist. However, there still is multipath propagation and inter-pulse interference for fast pulse systems which have to be mitigated by coding techniques

Today, most computer and consumer electronic devices-everything from a digital camcorder and DVD player to a mobile PC and a high-definition TV (HDTV)-require wires to record, play or exchange data. UWB will eliminate these wires, allowing people to “unwire” their lives in new and unexpected ways. Through UWB:

A digital camcorder could play a just-recorded video on a friend’s HDTV without anyone having to fiddle with wires. A portable MP3 player could stream audio to high-quality surround-sound speakers anywhere in the room. A mobile computer user could wirelessly connect to a digital projector in a conference room to deliver a presentation. Digital pictures could be transferred to a photo print kiosk for instant printing without the need of a cable. An office worker could put a mobile PC on a desk and instantly be connected to a printer, scanner and Voice over IP (VoIP) headset All information provided related to future Intel® products and plans are preliminary and subject to change at any time, without notice.





Related

COMMENT Uncategorized



  1. Guru

    UWB (Ultra Wideband) is a radio frequency platform that personal area networks can use to wirelessly communicate over short distances at high speeds. UWB is ideally suited for streaming multimedia in the wireless home or office environment.

    Growing interoperability between devices like digital camcorders, PDAs, cell phones, portable MP3 and DVD players, HDTVs and computers makes wired technology less and less convenient or practical. Wireless technologies like Bluetooth free home devices from wires, but slow data transmission. Ideally, a consumer should be able to wirelessly send data from one device to another at a rate equal to or better than a high-speed Internet connection. UWB, augmenting existing WiFi and WiMax technologies, can deliver the goods.

    While other wireless technologies use radio sine waves that provide “continual” transmission at a specific frequency, UWB is unique. A UWB transmitter sends out pulses or bursts of RF (radio frequency) that last roughly 30 picoseconds (30 trillionths of a second) to a few nanoseconds (billionths of a second) each. These RF bursts radiate outward in a wide band, transmitting over many frequencies simultaneously. The pulses are emitted in a rhythm unique to each transmitter. The receiver must know the transmitter’s rhythm signature or pulse sequence to “know how to listen” for the data being transmitted.

    As a result of their ultra-low power, short bursts and proprietary pulse signatures, several UWB networks can overlap one another without RF interference or eavesdropping. UWB is so secure it is a favored technology of the military, which has been using UWB since it was first developed for covert use in 1960 during the Cold War.

    Since UWB uses very little power, UWB networks are virtually undetectable and energy-efficient. UWB operates best over short distance of about 30 feet (10 meters). Current flavors can deliver data speeds of 480 megabits per second (Mbps) at distances from six to ten feet (2-3 meters). As distance increases, speed decreases, but at 30 feet transmissions still reach or exceed 100 Mbps — the speed of a standard tier DSL connection. Future scaling of UWB is expected to push speeds to 2 Gbps (gigabits per second) or more.

    Aside from networking, UWB can also be used for other industries, including radar and electronic positioning, or GPS-type technologies. With UWB’s ultra-low power consumption, it would also be ideal for mobile phone use. High-gain antennas could reportedly extend the distance barrier to just over half a mile, or about one kilometer. A cell phone operating on UWB would reportedly last for weeks before requiring recharging, rather than days. Though UWB transmitters would have to be rather ubiquitous, they do not cause radio interference.

    In the United States, UWB can legally operate in a frequency range between 3.1 GHz and 10.6 GHz at limited transmit powers. As of spring 2006 there are competing standards for UWB in the U.S. The two main camps are represented by the WiMedia Alliance and the UWB Forum. A single standard is important to consumers and manufacturers alike, however, experts aren’t yet sure which standard will win out.






EDUCATION

INSURANCE


CONTACT
FAVORITE
SITEMAP
VLSI COMPANIES IN BANGALORE
VLSI INTERVIEW QUESTION RFSIR.COM