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IEICE Transactions on Communications 2008 E91-B(4):998-1005; doi:10.1093/ietcom/e91-b.4.998
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Network

Clear Channel Assessment in Ultra-Wideband Sensor Networks

Bin ZHEN1, Huan-Bang LI1 and Ryuji KOHNO1

1 The authors are with National Institute of Information and Communications Technology, Yokosuka-shi, 239-0847 Japan. E-mail: zhen.bin{at}nict.go.jp


  Abstract

Impulse ultra-wideband (UWB) is an attractive technology for large ad hoc sensor networks due to its precise ranging capacity, multi-path fading robustness and low radiation power. The transient and carrier-less nature of low radiation pulse and harsh multipath channel condition makes it cumbersome to implement carrier sensing. We proposed clear channel assessment (CCA) based on preamble-assisted modulation (PAM) for UWB sensor networks. Preamble symbols are periodically inserted into the frame payload in the time domain to serve as regular feature for reliable CCA. We simulated the CCA performance in the multipath UWB channel model developed by IEEE 802.15.4a. PAM and CCA configurations were optimized for the distributed carrier sense multiple access protocol. PAM was accepted by 802.15.4a group as an optional feature. Furthermore, the multiplexed preamble symbols can be exploited for channel estimation to improve communication and ranging.

Key Words: ultra-wideband, preamble-assisted modulation, clear channel assessment, wireless sensor networks

Manuscript received August 7, 2006. Manuscript revised July 13, 2007.


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