NDLI: Clear Channel Assessment (CCA) with multiplexed preamble symbols for impulse Ultra-wideband (UWB) communications

Content Provider	IEEE Xplore Digital Library
Author	Qi, Y. Li, H. Hara, S. Kohno, R.
Copyright Year	2006
Description	Author affiliation: Nat. Inst. of Inf. & Commun. Technol., Yokosuka (Qi, Y.; Li, H.; Hara, S.; Kohno, R.)
Abstract	Because of the low radiation power density and the sparse and transient nature of impulse UWB radio, the conventional clear channel assessment (CCA) technique, which is to detect the energy of carrier waveforms, cannot be applied. In this paper, we propose a simple packet structure with multiplexed preamble symbols to enable the CCA of impulse UWB radio, where CCA is to detect the presence of a preamble symbol. We introduce two types of multiplexed preamble symbols, i.e., the CDMA (code division multiple access) type and the TDMA (time division multiple access) type. We devise a corresponding CCA scheme, where the processing gain is enhanced by exploiting the spreading code and repetition of a preamble symbol. Simulation results show the effectiveness of our approach. Our proposed TDMA type multiplexed preamble structure and related CCA parameter specifications have been accepted by the IEEE 802.15.4a standard to support the CCA function for UWB frequency bands
Starting Page	675
Ending Page	680
File Size	6870016
Page Count	6
File Format	PDF
ISBN	1424401011
DOI	10.1109/ICU.2006.281629
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time division multiple access Bandwidth FCC Access protocols Physical layer Media Access Protocol Communications technology Multiaccess communication Pulse modulation Ultra wideband technology
Content Type	Text
Resource Type	Article

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