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| | Amazon.ca: Books: Understanding Ultra Wide Band Radio Fundamentals |
 | | The chapter also discusses the generation of UWB signals using nonimpulsive schemes, such as OFDM, in which the ultra wide bandwidth is produced by a very high data rate. | | | The general consensus establishes that a signal is UWB if its bandwidth is large with respect to the carrier or center frequency of the spectrum, that is, if its fractional bandwidth is high. | | | The sudden and strong interest for UWB caused a rushed adoption of the IEEE 802.15.3 MAC standard also for the UWB physical layer, although this MAC is neither tailored nor optimized to UWB peculiarities. |
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http://www.amazon.ca/exec/obidos/ASIN/0131480030
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| | Ultra-Wideband (UWB) Technology, Technology & Research at Intel |
| | Specifically, UWB is defined as any radio technology having a spectrum that occupies a bandwidth greater than 20 percent of the center frequency, or a bandwidth of at least 500 MHz. | | | With the standardization of a common UWB development platform, device manufacturers in the PC, mobile, and consumer electronics markets will be able to easily use UWB as the radio or transport mechanism, taking advantage of the low power and high bandwidth this technology provides. | | | Modern UWB systems use other modulation techniques, such as Orthogonal Frequency Division Multiplexing (OFDM), to occupy these extremely wide bandwidths. |
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http://www.intel.com/technology/comms/uwb
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| | Wireless Bookshop - Wideband and Ultra-Wideband |
| | The topics include electromagnetic theory and scattering theory (including papers presented at a special session on fundamental solutions of Maxwell's equations); ultra-wideband radar systems; ultra-wideband and transient antennas; pulsed power generation and propagation; ultra-wideband polarimetry; ultra-wideband and transient metrology; detection and identification studies; RF interactions and chaotic effects; and biological effects. | | | Brand new material brings you up-to-date with the latest information on wideband electronic warfare receivers, the ADC testing procedure, frequency channelization and decoding schemes, and the operation of monobit receivers. | | | Today's systems are now wideband due to the different multiple-access methods(TDMA, CDMA) used in digital systems as well as the demand for high data rates. |
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http://www.palowireless.com/bookshop/booksuwb.asp
(575 words)
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| | Ultra high frequency - Free Encyclopedia |
| | Ultra high frequency (UHF) radio frequencies are those between 300 MHz and 3.0 GHz, which is higher than those of very high frequency (VHF). |
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http://www.wacklepedia.com/u/ul/ultra_high_frequency.html
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| | Table of Acronyms |
| | UART Universal Asynchronous Receiver/Transmitter uF micro Farad (measure of capacitance) UHF Ultra High Frequency UHV Ultra High Vacuum UJT UniJunction Transistor UL Underwriters Laboratories ULSI Ultra Large Scale Integration UPC Universal Product Code UPS Uninterruptible Power Supply USART Universal Synchronous/Asynchronous Receiver/Transmitter UTC Universal Time Code UV UltraViolet UVA UltraViolet Alpha UVB UltraViolet Beta | | | I2ICE Integrated Instrumentation and InCircuit Emulation IA Instrumentation Amplifier IC Integrated Circuit ICE InCircuit Emulation IEEE Institute of Electrical and Electronics Engineers IF Intermediate Frequency IGFET Insulated Gate Field Effect Transistor IMHO In My Humble Opinion IMNHO In My Not so Humble Opinion IOB Input/Output processor IP Interface Processor IR Current/Resistance | | | Prallax'es microcontroller name PIV Peak Inverse Voltage PLA Programmable Logic Array PLCC Plastic Leaded Chip Carrier PLD Programmable Logic Device PLL Phase Locked Loop PM Phase Modulation |
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http://www.ee.washington.edu/circuit_archive/text/acronyms.html
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| | Radio-Electronics.Com :: Ultra Wide Band (UWB) |
| | The alternative technology uses a wide band or multiband orthogonal frequency division multiplex (MBOFDM) signal that is effectively a 500 MHz wide OFDM signal that is hopped in frequency to enable it to occupy a sufficiently high bandwidth. | | | The impulse based technology, also called direct sequence ultra wideband (DS-UWB) in view of some of the techniques used is being used for a number of high data rate data transmissions such as short range video transmissions. | | | Ultra-Wide Band (UWB) is a rapidly emerging wireless technology that promises data rates well beyond those possible with currently deployed technologies such as 802.11a, b, g, WiMax and the like. |
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http://www.radio-electronics.com/info/wireless/uwb/uwb_overview.php
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| | Ultra Wide-Band Radar Imaging of Stones in Dense Grass |
| | Due to ultra-wide band (UWB) performances implemented by impulse or step-frequency technique resulted in high spatial resolution achieved those radars are applied for demining also [2, 4-6]. | | | (a) Principal components of UWB impulse radar used in experimental set-up where Tx is transmitter, Rx is receiver, ADC/DSP is analog-to-digital converter and digital signal processing computer card. | | | In the process of platform motion a synthetic-aperture technique is implemented offering into single framework solution for mine detection and discrimination problems in stand-off and stand-over modes. |
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http://demining.jrc.it/aris/events/mine99/program/P111-116/pag111-116.htm
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| | URSI Commission A: Electromagnetic Metrology |
| | Another important "quantum jump" was the demonstration of the possibility of performing a direct frequency division in the visible, using ultra short femtosecond pulses. | | | The problem of practical and routine multiplication of the microwave resonance frequency of the cesium atom (which defines the second in the SI system of units) to optical frequencies is now widely regarded as having been solved by a new system based on ultra-short pulses generated by a laser. | | | Regarding the fact, that a significant number of new and high accuracy frequency values for various cold atoms and ions have been measured which should be added to the CCL list of recommended radiations, it will probably be necessary to move some less important radiations to the list of spectral lamps and other sources. |
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http://www.ursi.org/Maastricht/ComAreptri.htm
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| | Nord Ultra Internet Services - Internet Glossary |
| | FDM (frequency-division multiplexing) is a multiplexing technique for analog systems, and can combine hundreds of simultaneous low bandwidth analog signals, such as telephone conversations, into a single analog signal for transmission over a high quality line. | | | Most computers are binary, and detect data (or count) in base 2, using only ones and zeros. | | | As a result, transistors are capable of displaying an on (Y) or off (N) state while being supplied with extremely low levels of power, which makes them suitable as the fundamental unit of hardware in a binary computer. |
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http://www.nordultra.net/glossary.htm
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| | Low-Power Signal Processing System Design for Wireless Applications |
| | This fairly low operating frequency is an indication of the efficiency of our compression algorithm. | | | To maintain low power consumption for high-resolution displays, based on the design principles outlined in the second section, parallel chips running at the lowest possible clock rate should be used. | | | In signal processing applications, as distinct from general-purpose computing, it is throughput that is the design constraint instead of attempting to compute as quickly as possible. |
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http://www.comsoc.org/pci/private/1998/jun/Meng.html
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| | Interface Ultra Wideband (UWB) from Texas Instruments |
| | Ultra Wideband (UWB) is a wireless technology for transmitting digital data at very high rates over a wide spectrum of frequency bands using very low power. | | | TI advocates initially using the low-end spectrum, between 3.1 GHz and 4.8 GHz, and then eventually moving into the higher frequency bands. | | | According to a June 2002 research report by In-Stat/MDR, wireless home networking will be the key to adoption of Ultra Wideband in the marketplace, with UWB dominating home networking by 2006. |
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http://focus.ti.com/analog/docs/gencontent.tsp?genContentId=846&familyId=361
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| | Cyberfab :: Tips & Technology - Ultra Wide Band |
| | The very low cost, the high miniaturization capability and the environmental friendliness due to the very low electromagnetic energy emission are other aspects of specific interest of the technique. | | | Just a paper only appears to have been published about the applications of UWB radar to actual medical problems, although many papers on the interaction of radio frequency energy with the living tissues, and safety issues, can be found in the literature. | | | A review of the biomedical applications known at present is presented based on the published documents and information derived from the web sites of the Institutions carrying on the research (gray literature). |
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http://www.cyberfab.net/TipsTechnology/UltraWideBand.htm
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| | Precise Time and Frequency Transfer |
| | We are also funded to evaluate time-transfer between the GRACE ultra stable oscillators. | | | Abstract: The key to accurate time and frequency transfer with carrier phase GPS is the adoption of the geodetic analysis method. | | | Geodetic carrier phase receivers operate continuously; in principle, timing solutions can be available at high frequencies at no additional cost. |
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http://www.colorado.edu/engineering/GPS/TimeTransfer.html
(189 words)
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| | Ultra Wideband (UWB) - Revolutionary Wireless Technology |
| | Ultra Wideband is a innovative wireless technology which can transmit digital data over a wide frequency spectrum with very low power and at very high data rates. | | | The IEEE and ETSI standards bodies are in the process of defining a standard for Ultra Wideband physical layer systems. | | | We are currently involved in the research and development of Ultra Wideband techniques and have developed our own Ultra Wideband Testbed |
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http://www.roke.co.uk/uwb
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| | UWB technology - www.artimi.com |
| | Ultra Wideband (UWB) is a method of sending information using high frequency low energy pulses. | | | Because UWB signals will not interfere with each other or with conventional RF carriers, the technology will open up vast new communication possibilities by creating a new communication medium that peacefully coexists with existing technologies. | | | UWB has the potential of orders of magnitude greater spatial capacity compared to other current or emerging technologies, allowing much faster and denser wireless networks. |
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http://www.artimi.com/uwb
(645 words)
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| | Ultra wide Band (UWB) Technology: Potential and Challenges : Market Research Report |
| | Ultra Wideband (UWB) allows a system to operate across a range of frequency bands while not interfering with existing communication systems. | | | Ultra wide Band (UWB) Technology: Potential and Challenges | | | This is because it uses very low transmit power but can still maintain a high data rate. |
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http://www.marketresearch.com/map/prod/1034310.html
(645 words)
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| | NAVAL SPACE COMMAND (NAVSPACE) |
| | The Extremely-High Frequency packages on the Ultra-High Frequency Follow-On-4 and subsequent spacecraft in the series constitute an additional 11 channels distributed between an Earth coverage beam and a steerable 5-degree spot beam. | | | The Ultra-High Frequency Follow-On spacecraft are designed for a 14-year lifetime and will be compatible with ground-based and sea-based communications terminals already in service. | | | Naval Space Command also manages a new generation of Ultra-High Frequency communications satellites now being launched to replace Fleet Satellite and Leased Satellite systems, which are nearing the end of their operational lives. |
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http://www.au.af.mil/au/awc/awcgate/usspc-fs/navspace.htm
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| | Ultra-High Frequency Transducers |
| | Ultra-high frequency (UHF) transducers are designed to complement high-frequency compression drivers and extended-range cone transducers, thus providing the multi-way system with extended frequency range and fidelity. | | | The 2402H ultra-high frequency transducer is engineered for tight pattern control and extremely high on-axis sensitivity for incredible clarity and crispness. | | | Designed for use as an ultra-high frequency driver in multi-element, wide range loudspeaker systems, the JBL Model 2404H delivers an unmatched combination of wide, tightly controlled dispersion, extended frequency response, high power capacity, and high efficiency. |
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http://www.jblpro.com/pages/components/uhf_drvs.htm
(162 words)
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| | Ultra-High Frequency Transducers |
| | The 2402H ultra-high frequency transducer is engineered for tight pattern control and extremely high on-axis sensitivity for incredible clarity and crispness. | | | Ultra-high frequency (UHF) transducers are designed to complement high-frequency compression drivers and extended-range cone transducers, thus providing the multi-way system with extended frequency range and fidelity. | | | Designed for use as an ultra-high frequency driver in multi-element, wide range loudspeaker systems, the JBL Model 2404H delivers an unmatched combination of wide, tightly controlled dispersion, extended frequency response, high power capacity, and high efficiency. |
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http://www.jblpro.com/pages/components/uhf_drvs.htm
(162 words)
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| | Ultra High Frequency Microarchitecture Project at IBM Research |
| | The purpose of the Ultra high frequency microarchitecture project is to study the challenges and opportunities afforded by the future use of ultra high frequency designs. | | | Challenges of ultra high frequency microarchitectures studied are latency-aware design of memory hierarchies for both instruction and data delivery, low-complexity high frequency pipeline design, and power analysis. | | | Ultra High Frequency Microarchitecture Project at IBM Research |
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http://www.research.ibm.com/lowfo4
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| | BandMecca.com - Ultra High Frequency |
| | Ultra High Frequency consists of front man/songwriter Frank Fussa (vocals, guitar), Jon Tehel, (guitar, vocals), Chris Johanidesz (bass, vocals), and DJ Jacobs (drums). | | | Ultra High Frequency has already performed live on air on local radio station WLRI with many other live performances to happen. | | | Now comes word that Ultra High Frequency has blasted its way on college radio stations and their respected charts. |
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http://www.bandmecca.com/viewband.cfm?ID=819
(310 words)
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| | Ultra-High Frequency Transducers |
| | Ultra-high frequency (UHF) transducers are designed to complement high-frequency compression drivers and extended-range cone transducers, thus providing the multi-way system with extended frequency range and fidelity. | | | The 2402H ultra-high frequency transducer is engineered for tight pattern control and extremely high on-axis sensitivity for incredible clarity and crispness. | | | Designed for use as an ultra-high frequency driver in multi-element, wide range loudspeaker systems, the JBL Model 2404H delivers an unmatched combination of wide, tightly controlled dispersion, extended frequency response, high power capacity, and high efficiency. |
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http://www.jblpro.com/pages/components/uhf_drvs.htm
(162 words)
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| | Ultra-High Frequency Transducers |
| | The 2402H ultra-high frequency transducer is engineered for tight pattern control and extremely high on-axis sensitivity for incredible clarity and crispness. | | | Ultra-high frequency (UHF) transducers are designed to complement high-frequency compression drivers and extended-range cone transducers, thus providing the multi-way system with extended frequency range and fidelity. | | | Designed for use as an ultra-high frequency driver in multi-element, wide range loudspeaker systems, the JBL Model 2404H delivers an unmatched combination of wide, tightly controlled dispersion, extended frequency response, high power capacity, and high efficiency. |
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http://www.jblpro.com/pages/components/uhf_drvs.htm
(162 words)
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| | Radio frequency |
| | Other topics in our resources on Satellite Communications related to Radio frequency include: ultra high frequency (UHF), super high frequency (SHF), extremely high frequency (EHF) | | | Bands commonly used in satellite communications include the ultra high frequency (UHF), super high frequency (SHF) and extremely high frequency (EHF). | | | The radio-frequency range is divided by the ITU-R into a number of bands of frequencies, where all frequencies in a band exhibit similar properties. |
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http://satellite.argospress.com/radifreque.htm
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| | UHF - Ultra-High Frequency |
| | Ultra high frequency Part of the radiofrequency spectrum between 300 and 3,000 MHz. | | | Ultra high frequency television signals; broadcast channels 14 to 83. | | | (Ultra High Frequency): Radio frequencies that are between 300 to 3000 MHz. |
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http://www.auditmypc.com/acronym/UHF.asp
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| | HITACHI GLOBAL : News Releases from Headquarters : Dec 5, 2001 |
| | Bipolar CMOS (BiCMOS), a combination of the ultra-high-speed HBT and the mid-to-low speed signal processing CMOS (Complementary Metal-Oxide Semiconductor), is currently considered a viable solution to the above-mentioned requirement, and research is being focused on this device. | | | Improvement in transistor operating speed: A self-aligned SiGeC HBT with low parasitic resistance and low parasitic capacitance was fabricated using a high-quality base layer of SiGeC containing 0.4% carbon, and high-speed high-frequency performances of 124-GHz cutoff frequency and 174-GHz maximum oscillation frequency were achieved. | | | Cutoff frequency: Frequency at which current gain of a transistor becomes unity; that is, the highest frequency that a transistor can amplify current. |
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http://www.hitachi.com/New/cnews/E/2001/1205a/index.html
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| | purevolume™ Ultra High Frequency |
| | Following footsteps of the great bands of the 1960's and 70's, Ultra High Frequency combines smooth harmonies with dueling melodious guitars and a thunderous rhythm section, unveiling a sound that you just dont hear anymore. | | | You may or may not have heard of Ultra High Frequency, but if you have, then you already know their unique blend of RocknRoll. | | | Ultra High Frequency's Myspace So please head over there and check us out. |
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http://www.purevolume.com/ultrahighfrequency
(239 words)
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| | Wireless Technologies |
| | They vary from the extremely low frequency (ELF) to tremendously high frequency (THF) and within this range are UHF (ultra-high frequency) and the VHF (very high frequency). | | | High frequency radio signals are transmitted from one terrestrial transmitter to another | | | Microwave dishes and relay towers may be on the ground, however, they are usually situated atop high places, such as mountains or tall building, so that signals can be beamed over uneven terrain (ibid). |
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http://cbdd.wsu.edu/kewlcontent/cdoutput/TR501/page16.htm
(971 words)
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| | Maritime broadcast communications net - Wikipedia, the free encyclopedia |
| | In telecommunication, a maritime broadcast communications net is a communications net that is used for international distress calling, including international lifeboat, lifecraft, and survival-craft high frequency (HF); aeronautical emergency very high frequency (VHF); survival ultra high frequency (UHF); international calling and safety very high frequency (VHF); combined scene-of-search-and-rescue; and other similar and related purposes. | | | Note: Basic international distress calling is performed at either medium frequency (MF) or at high frequency (HF). |
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http://en.wikipedia.org/wiki/Maritime_broadcast_communications_net
(139 words)
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