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UWB

(Ultra-WideBand) A wireless technology that uses less power and provides higher speed than 802.11 Wi-Fi networks and first-generation Bluetooth products. UWB is expected to provide wireless...

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Definition: UWB

(Ultra-WideBand) A wireless technology that uses less power and provides higher speed than 802.11 Wi-Fi networks and first-generation Bluetooth products. UWB is expected to provide wireless video transmission for home theater systems, cable TV, auto safety and navigation, medical imaging and security surveillance.

Pulse Radio
Unlike other radio transmission systems, UWB does not use a continuous carrier frequency. It transmits extremely short pulses, and the durations between pulses do not use power. There are two ways to transmit this so-called "pulse radio." One method transmits the pulses in continuously varying time slots based on a pseudo-random number sequence like CDMA. The other divides the spectrum into smaller frequency bands that can be added and dropped as necessary.

UWB Sees Through Walls
Because UWB can transmit through materials that would bounce other radio signals, it is also used to pinpoint objects behind barriers or buried underground. First invented by Gerald Ross at Sperry Rand Corporation in the late 1960s, UWB has been used by the military for various radar systems. In 1998, the FCC allowed UWB for police work and fire fighting. In 2002, it sanctioned the technology at considerably lower power for commercial use. See WiMedia Alliance, 802.15 and GPR.

                          Max.
            Max.   Freq.  Cell
 Wireless  Speed   Range  Range
 Type      (Mbps)  (GHz)  (ft.)
 UWB        480   3.1-10.6   33
 Bluetooth
 BT 1.2      1     2.4      330
 BT 2.0      3     2.4      330
 Wi-Fi
 802.11b    11     2.4      150
 802.11g    54     2.4      170
 802.11a    54     5         95
 802.11n   600     2.4/5    230





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    It's science fiction now, but within the next year and a half, a little-known technology named ultrawideband (UWB) could challenge 802.11 for wireless networking technologies. But UWB, which...

    News items | October 30, 2001 12:00am PST

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