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(Ultra-WideBand) A wireless technology that uses less power and provides higher speed than Wi-Fi and first-generation Bluetooth products. Governed by the WiMedia Alliance, UWB is geared for home theater video, auto safety and navigation, medical imaging and security surveillance.

Pulse Radio
Unlike other radio transmission, UWB does not use a continuous carrier frequency. It transmits extremely short pulses, and the durations between pulses use no power. 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.   Freq.   IndoorWireless   Speed   Range   RangeType       (Mbps)  (GHz)   (ft.)UWB         480   3.1-10.6   33

  BT 1.2       1     2.4      330
  BT 2.0       3     2.4      330

  802.11b     11     2.4      150
  802.11g     54     2.4      170
  802.11a     54     5         95
  802.11n    600     2.4/5    230
  802.11ac  6770     5        230
References in periodicals archive ?
One of the first wire-less products to use UWB is the Belkin CableFree USB Hub, which lets you connect peripherals to a PC without running wires to the computer.
Since forming the company, one of Pulse~LINK's primary goals for UWB communications has been the pursuit of high data rates at long transmission ranges," adds Pulse~LINK chief technology officer John Santhoff.
Since UWB is a position sensitive technology, the potential uses are many, including search and rescue and inventory tracking", noted Russ Craig, research director for the Aberdeen Group.
The lack of standards in the UWB space is one of the issues the industry still needs to work out," noted Paul Reinhardt, the WiMedia Alliance's acting director.
UWB is exciting because the technology allows more data to be carried in existing frequency spectrum that otherwise would remain unused.
Another worry suggests that the cumulative effect of wide scale proliferation of UWB devices would have a cumulative effect on the noise floor and raise it to an unacceptable level.
What is driving UWB into the consumer market is the ability to render UWB circuitry into CMOS technology.