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and Tho Le-Ngoc academia and industry for applications in wireless communications [1, 2]. UWB has many benefits, including high data rate, availability of low-cost transceivers, low transmit power, and low interference. It operates with emission levels that are commensurate with com- mon digital devices such as laptops, palm pilots, and pocket calculators. The approval of UWB technology [3] made by the Federal Communications Commission (FCC) of the United States in 2002 reserves the unlicensed frequency band between 3.1 and 10.6 GHz (7.5 GHz) for indoor UWB wireless communication systems. Industrial standards such as IEEE 802.15.3a (high data rate) and IEEE 802.15.4a (very low data rate with ranging) based on UWB technology have been introduced. On the other hand, the Department of Defense (DoD) UWB systems are different from commercial systems in that jam- ming is a significant concern. Although R&D efforts in recent years have demonstrated that UWB radio is a promising solution for high-rate short-range and moderate-range wireless communications and ranging, further extensive investigation, experimentation, and development are necessary to produce effective and efficient UWB communication systems. In particular, UWB has found a new application for lower-data-rate moderate- range wireless communications, illustrated by IEEE 802.15.4a and DoD systems with joint communication and ranging capabilities unique to UWB. Unlike the indoor envi- ronment in 802.15.3a (WPAN), the new environments for sensors, IEEE 802.15.4a, and DoD systems will be very different, ranging from dense foliage to dense urban obstruc- tions. The application of UWB to low-cost, low-power sensors has a promise. The centimeter accuracy in ranging and communications provides unique solutions to appli- cations, including logistics, security applications, medical applications, control of home You are here: CodeIdol > Telecommunications > Wireless Communications and Networks > page: 15 16 17 18 19 20 21 22 23 24 25 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 |
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