| LC control no. | sh2015001981 |
|---|---|
| LC classification | TK5103.4515 |
| Topical heading | Ultra-wideband communication systems |
| Variant(s) | Ultrawideband communication systems Ultra-wideband systems UWB communication systems |
| See also | Broadband communication systems Wireless communication systems |
| Found in | Work cat: Pradhan, K.P. A report on biotelemetry systems and scope of UWB in wireless biotelemetry, 2015: abstr. (This review report presents the brief historical development of the biotelemetry system, analyzes and discusses the current development and research trends in sensors, transmitter and receiver design. Finally, the application, scope and impact of UWB on biotelemetry system have been discussed) Molisch, A.F. Ultrawideband communications : an overview, [2008?], via WWW. Aug. 11, 2015 abstr. (This paper presents an overview of ultrawideband (UWB) communications systems, i.e., systems with very large relative and/or absolute bandwidth. The large bandwidth and low power spectral density mandated for UWB systems allows to use them as overlay over existing (legacy) systems, i.e., they can be used in the same frequency range as existing systems without causing undue interference. We also describe the most common types of UWB systems, including time-hopping impulse radio, frequency hopping, and multiband-OFDM. We furthermore discuss interference aspects and the peculiarities of UWB propagation channels) Ultra wideband systems : technologies and applications, 2006: p. xiv (The main theme of the book is that UWB is not a specific technology, modulation, or multiple access technique; nor is it a specific application. Rather, it is defined as available spectrum that needs to be used according to specific rules. This spectrum is characterized by transmitters that emit very low average power and, as such, generate a very low level of interference with other systems sharing the same spectrum. This enables the unique property of UWB, which is spectrum open to many services that do not cause harmful interference with each other. This results in a new and more efficient use of the spectrum. Several technologies have been developed to use the UWB spectrum so far. The most successful commercially are based on well-known communication techniques, such as direct sequence spread spectrum or orthogonal frequency division multiplexing (OFDM). They also differentiate each other by using a single band or multiple bands in the same system) UWB communication systems, 2006: p. 3 (UWB has a number of features which make it attractive for consumer communications applications. In particular, UWB systems (i) have potentially low complexity and low cost; (ii) have a noise-like signal spectrum; (iii) are resistant to severe multipath and jamming; (iv) have very good time-domain resolution allowing for location and tracking applications. The low complexity and low cost of UWB systems arise from the baseband nature of the signal transmission. Unlike conventional systems, the UWB transmitter produces a very short time-domain pulse which is able to propagate without the need for an additional RF (radio frequency) mixing stage. ... The very wideband nature of the UWB signal means that it spans frequencies commonly used as carrier frequencies. The signal will propagate well without the need for additional up-conversion. The reverse process of down-conversion is also not required in the UWB receiver. Again, this means the omission of a local oscillator in the receiver, and the removal of associated complex delay and phase tracking loops. Consequently, UWB systems can be implemented in low-cost, low-power integrated circuit processes) IEEE potentials , Mar./Apr. 2009: p. 9 (Ultra-wideband (UWB) wirelesscommunication is a revolutionary technology for transmitting large amounts of digital data over a wide frequency spectrum using short-pulse, lowpowered radio signals. UWB commonly refers to a signal or system that either has a large relative bandwidth (BW) that exceeds 20% or a large absolute bandwidth of more than 500 MHz. A 14 February 2002 Report and Order by the Federal Communications Commission (FCC) authorizes the unlicensed use of UWB in 3.1--10.6 GHz. This is intended to provide an efficient use of scarce radio bandwidth while enabling both high data rate personal area network (PAN) wireless connectivity and longer-range, low data rate applications as well as radar and imaging systems) |
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