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In most Asian and European countries, detect-and-avoid (DAA) is required at UWB low band (3.1-4.8 GHz). In Japan, we conducted evaluation experiments on the performance of DAA until March of 2010, which was a part of a three-year campaign to provide results of literature review and technical evaluation for the purpose of accomplishing Japanese UWB regulation. In this paper, experiment results on the...
This paper presents two tunable notch filters (TNFs) for detect-and-avoid (DAA) implementation in an ultra-wideband (UWB) radio system. The developed filters have relatively wide- and narrow-stopband, respectively, using two different resonant structures. A system experiment has been carried out to evaluate the influence of bandwidth of notch band on the system performance when the two different filters...
In 2007, IEEE802.15.4a was standardized as a low-rate and low-power UWB system for sensor networks. In general, detection of the IEEE802.15.4a signal is considered to be difficult because of its low transmitting power density and low duty cycle. However, if detecting of the IEEE802.15.4a signal is available, it is possible to avoid interference issues both among the 15.4a systems and between the 15...
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