Mitigation of sampling-induced errors in delay estimation

被引:0
作者
Qi, YH [1 ]
Kohno, RJ [1 ]
机构
[1] Natl Inst Informat & Commun Technol, UWB Grp, Yokosuka, Kanagawa 2390847, Japan
来源
2005 IEEE INTERNATIONAL CONFERENCE ON ULTRA-WIDEBAND (ICU) | 2005年
关键词
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Delay estimation has been well accepted as an important approach to ranging with a UWB (ultra-wide band) system. Delay estimation errors due to digital sampling can be considerably large at a low sampling frequency. In this paper, we investigate reduction of such errors in both analytical and practical aspects. A delay estimation scheme based on the so-called simplified maximum likelihood formulation is first derived, and is further shown to be optimal in the sense that its error variance converges to the corresponding theoretical lower limit as the sampling frequency is sufficiently high. Next, an iterative scheme for first arrival detection is devised in light of the near-far robustness in multiuser detection. This scheme can effectively cope with a frequent UWB environment where the first arriving signal component may not be dominant among multipath components. Efficient reduction of sampling-induced errors and a low computation complexity are main advantages of the proposed schemes.
引用
收藏
页码:402 / 407
页数:6
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