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Ultra-Wide Band
Wireless Personal Area Networks (WPANs) are very small networks within a
confined space, such as an office workspace or room within the home. Ultra
Wideband (UWB) technologies, offering WPAN users a much faster, short-distance
connection, are currently under development.
Wi-Fi
Wireless Local Area Networks (WLANs) have broader range than WPANs, typically
confined within office buildings, restaurants, stores, homes, etc. WLANs are
gaining in popularity, fueled in part by the availability of devices optimized
for wireless computing such as Intel® Centrino® Mobile Technology.
WiMAX
Wireless Metropolitan Area Networks (WMANs) cover a much greater distance than
WLANs, connecting buildings to one another over a broader geographic area. The
emerging WiMAX technology (802.16d today and 802.16e in the near future) will
further enable mobility and reduce reliance on wired connections.
 3G Wireless Wide Area Networks (WWANs) are the broadest range wireless networks, and are most widely deployed today in the cellular voice infrastructure although they also have the ability to transmit data. Next-generation cellular services based on various 3G technologies will significantly improve WWAN communications. |
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UWB technology will bring the convenience and mobility of wireless
communications to high-speed interconnects in devices throughout the digital
home and office. Designed for short-range, wireless personal area networks (WPANs),
UWB is the leading technology for freeing people from wires, enabling
wireless connection of multiple devices for transmission of video, audio and
other high-bandwidth data. UWB, short-range radio technology, complements other longer range radio technologies such as WiFi*, WiMAX, and cellular wide area communications. Its use will be to relay data from a host device to other devices in the immediate area (up to 10 meters or 30 feet). |
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| How UWB Works |
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| A traditional UWB transmitter works by sending
billions of pulses across a very wide spectrum of frequencies several GHz in
bandwidth. The corresponding receiver then translates the pulses into data
by listening for a familiar pulse sequence sent by the transmitter.
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. Modern UWB systems use other modulation techniques, such as Orthogonal Frequency Division Multiplexing (OFDM), to occupy these extremely wide bandwidths. In addition, the use of multiple bands in combination with OFDM modulation can provide significant advantages to traditional UWB systems. UWB's combination of broader spectrum and lower power improves speed and
reduces interference with other wireless spectra. In the United States, the
Federal Communications Commission (FCC) has mandated that UWB radio
transmissions can legally operate in the range from 3.1 GHz up to 10.6 GHz,
at a limited transmit power of
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