Accurate TOA Estimating UWB-IR Transceiver for Ranging System in Multi-Path Environment

Ryosuke FUJIWARA  Kenichi MIZUGAKI  Goichi ONO  Tatsuo NAKAGAWA  Takayasu NORIMATSU  Takahide TERADA  Akira MAEKI  Masayuki MIYAZAKI  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.3    pp.777-785
Publication Date: 2011/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.777
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Sensing
positioning,  ranging,  sensor network,  ultra wideband impulse radio,  

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In this work, an ultra-wideband impulse radio (UWB-IR) transceiver with accurate time-of-arrival (TOA) estimation for a ranging/positioning system was developed for wireless sensor network applications. The system uses an impulse radio characterized by a low duty cycle and direct-sequence spreading, which enable very precise ranging and good receiver sensitivity. An algorithm enabling the TOA of the first-path signal to be measured accurately in a multi-path environment with simple, low-power and low cost implementations was proposed. UWB chips with CMOS 0.18-µm technology and UWB transceiver modules performed that the accuracy of the proposed ranging system is 18.5 cm in a closed space.