UWB


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UWB

(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.

In 2019, Apple's iPhone 11 debuted with UWB to improve its AirDrop wireless sharing feature. UWB provides more precise detection of another iPhone in the vicinity than does Bluetooth. See AirDrop.

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

  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
  802.11ac  6770     5        230
References in periodicals archive ?
Combining high-precision sensing with Artificial Intelligence, the UWB car key is able to learn personal gestures for easy opening of the vehicle doors.
At one company that makes glass panes for the automotive industry, tracking carts in real time with UWB beacons has cut out the time the company previously spent sending people out to locate panes on specific carts.
In addition to the study of guanxi and unethical decision making, research on workplace exclusion can also provide some inspiration in understanding the relationship between guanxi and UWB. As is well-known in China, Chinese people tend to present a clear distinction between their inner circle and outer circle, under the influence of the differential order pattern and circle culture: they are close to people in their inner circle and alienated from people in the outer circle (Cheng, 1995; Ma & Qu, 2007).
In order to investigate the proposed reconfigurable filtering system, the printed monopole UWB structure is chosen.
In [11], a high isolation MIMO antenna was designed for UWB applications and was exposed; between two of its elements, a comb-line structure was inserted in order to achieve high isolation.
It can be seen that the proposed antenna has an ultrawide operating band from 2.7 to 12.3 GHz for S11 [less than or equal to] -10 dB, which covers the entire UWB band.
To maintain the BER performance of UWB systems from outdoor channel distortions and the effects of UWB antenna imperfections, a mitigation technique is required to track the tropical outdoor channel adaptively.
The antenna operates in the UWB range (3.1GHz to 10.6GHz) and the WIMAX band is completely notched when 'Wr' is 1.0mm wide.
By comparing the UWB's properties with the sinusoidal carrier-based system, the following are the UWB's advantages.
In recent years, multiple access UWB communication has been a hot research topic as the development of UWB technologies.