Performance Evaluation of Threshold-Based UWB Ranging Methods – Leading Edge vs. Search Back –

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 5Language: englishTyp: PDF

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Haneda, Katsuyuki; Vainikainen, Pertti (SMARAD Centre of Excellence, Helsinki University of Technology (TKK), Finland)
Takizawa, Ken-ichi; Takada, Jun-ichi (Medical ICT Group, National Institute of Information and Communications Technology, Japan)
Takada, Jun-ichi; Dashti, Marzieh (Department of International Development Engineering, Tokyo Institute of Technology, Japan)

Accurate ranging is one of the most promising applications of ultra wideband radio in sensor networks. Amongst variety of ranging methods, threshold-based ranging is a primitive, but robust technique suitable for battery-limited systems. This contribution reports the performance of two threshold-based ranging methods: leading edge detection and search back method. The evaluation utilized real-world measured propagation channels and followed the band plan and the transmit power restriction of the IEEE802.15.4a-2007 standard. Effects of the system bandwidth and the center frequency on ranging performance were analyzed. The following conclusions were obtained from the analyses: 1) the leading edge detection outperforms the search back method; 2) accurate ranging in the low band is promising even under the transmit power restrictions, while the use of the high band necessitates a fundamental countermeasure to improve the limited signal level at the receiver; and finally, 3) use of the wider bandwidth does not always provide better ranging performance.