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| NLOS Identification for IR-UWB Ranging Systems |
| Wu Shao-hua①② Zhang Qin-yu② Zhang Nai-tong①② |
| ①(School of Electronics and Information Technology, Harbin Institute of Technology, Harbin 150001, China) ②(Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China) |
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Abstract NLOS propagation is a main source of ranging error for IR-UWB localization systems. To mitigate the NLOS effects, a NLOS identification method which do not need accurate channel estimation process is proposed in this paper. Metrics are directly extracted from the received signal samples to identify the channel state. In this paper, product of DP-to-average and peak-to-average is constructed as the identification metric, whose performance is compared to conventional metrics including kurtosis and the mean excess delay. Simulation results show that performance corresponding to coherent ranging is better than that corresponding to non-coherent ranging, which is mainly due to the more accurate DP detection results and the higher sampling rate of coherent ranging. Performance comparison demonstrates that both kurtosis and the mean excess delay cannot obtain satisfying results, while using the product of DP-to-average and peak-to-average can increase the identification success ratio nearly 10 percent. Localization accuracy is expected to be improved by incorporating the NLOS identification results into the positioning module.
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Received: 26 November 2007
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Corresponding Authors:
Wu Shao-hua
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2008, Vol. 30 
