Multipath causes fading, and wave interference is destructive. Some UWB systems use "rake" receiver techniques to recover multipath-generated copies of the original pulse to improve a receiver's performance.
Other UWB systems use channel-equalization techniques to achieve the same purpose. Narrowband receivers may use similar techniques, but are limited due to the different resolution capabilities of narrowband systems. Ultra-wideband characteristics are well-suited to short-distance applications, such as PC peripherals. Due to low emission levels permitted by regulatory agencies, UWB systems tend to be short-range indoor applications.
Due to the short duration of UWB pulses, it is easier to engineer high data rates; data rate may be exchanged for range by aggregating pulse energy per data bit with integration or coding techniques.
Conventional orthogonal frequency-division multiplexing OFDM technology may also be used, subject to minimum-bandwidth requirements. High-data-rate UWB may enable wireless monitors , the efficient transfer of data from digital camcorders , wireless printing of digital pictures from a camera without the need for a personal computer and file transfers between cell-phone handsets and handheld devices such as portable media players.
Another feature of UWB is its short broadcast time.
Ultra-wideband is also used in "see-through-the-wall" precision radar-imaging technology,    precision locating and tracking using distance measurements between radios , and precision time-of-arrival-based localization approaches. Due to its low average power, high resolution, and object-penetrating ability, UWB technology has shown promise in Doppler processing. In terms of military use, a UWB Doppler radar could demonstrate ground, foliage, and wall penetrating capabilities.
In an effort to determine the practicability of this radar technology, the U. ARL has also investigated the feasibility of whether UWB radar technology can incorporate Doppler processing to estimate the velocity of a moving target when the platform is stationary. Ultra-wideband pulse Doppler radars have also been used to monitor vital signs of the human body, such as heart rate and respiration signals as well as human gait analysis and fall detection. It serves as a potential alternative to continuous-wave radar systems since it involves less power consumption and a high-resolution range profile.
However, its low signal-to-noise ratio has made it vulnerable to errors.
UWB, ultra wideband technology is still in its infancy. All articles with unsourced statements Articles with unsourced statements from June Articles with unsourced statements from July Articles with unsourced statements from July Articles with unsourced statements from November More than four dozen devices have been certified under the FCC UWB rules, the vast majority of which are radar, imaging or locating systems [ citation needed ]. The UFZ in Singapore 32 2. Despite this it is being recognised as a technology with a huge capability and as such it is being adopted in many new areas. This will enable the UWB ultra wideband transmissions to communicate successfully, but without affecting existing 'narrowband' transmissions.
However, after several years of deadlock, the IEEE Slow progress in UWB standards development, the cost of initial implementation, and performance significantly lower than initially expected are several reasons for the limited use of UWB in consumer products which caused several UWB vendors to cease operations in and This limit also applies to unintentional emitters in the UWB band the "Part 15" limit.
UK regulator Ofcom announced a similar decision  on 9 August To date the FCC in the USA has approved UWB, ultra wideband technology for indoor and short range outdoor communication, but with restrictions on the frequencies over which the transmission can spread as well as the power limits.
This will enable the UWB ultra wideband transmissions to communicate successfully, but without affecting existing 'narrowband' transmissions. To achieve these requirements the FCC has mandated that UWB, ultra wideband transmissions can legally operate in the range 3.
To achieve this last requirement, a transmission with a centre frequency of 6 GHz, for example, must have a bandwidth of at least 1. Consequently, UWB provides dramatic channel capacity at short range that limits interference.
The fact that very low power density levels are transmitted means that the interference to other services will be reduced to limits that are not noticeable to traditional transmissions. Additionally the lowest frequencies for UWB, ultra wideband have been set above 3 GHz to ensure they do not cut across bands currently used for GPS, cellular and many other services.
UWB, ultra wideband technology is still in its infancy. Despite this it is being recognised as a technology with a huge capability and as such it is being adopted in many new areas.
Many silicon manufacturers have already developed solutions which are being demonstrated, and more are being developed. An optical disc is an electronic data storage medium that can be written to and read from using a low-powered laser beam.
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