| 多用户环境下定位精度的克拉美罗下限 与时延估计算法 |
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| 引用本文： | 王巍,熊瑾煜,朱中梁.多用户环境下定位精度的克拉美罗下限 与时延估计算法[J].电子学报,2005,33(1):131-134. |
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| 作者姓名： | 王巍 熊瑾煜 朱中梁 |
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| 作者单位： | 西南电子电信技术研究所重点实验室,四川成都 610041 |
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| 摘 要： | 本文针对码分多址(CDMA)系统,推导了基于到达时间(TOA)的移动台定位所具有的估计精度下限,给出了定位估计精度下限推导的具体步骤和下限表达式,分析了该下限所具有的物理意义,得到了定位精度下限与用户数无关的结论.同时,提出了在长码扩频条件下能够抑制多址干扰(MUI)的时延估计算法,进一步说明了精度下限的物理含义.最后在仿真的基础上对估计下限和新算法的性能进行了讨论.
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| 关 键 词： | 码分多址 多址干扰 定位 信号到达时间 时延估计 克拉美罗下限 |
| 文章编号： | 0372-2112(2005)01-0131-04 |
| 收稿时间： | 2004-04-23 |
Cramer-Rao Low Bound for Location and Time Delay Estimation Algorithm in Multi-User Environments |
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| WANG Wei,XIONG Jin-yu,ZHU Zhong-liang.Cramer-Rao Low Bound for Location and Time Delay Estimation Algorithm in Multi-User Environments[J].Acta Electronica Sinica,2005,33(1):131-134. |
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| Authors: | WANG Wei XIONG Jin-yu ZHU Zhong-liang |
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| Affiliation: | National Key Lab of Southwest Inst of Electron & Telecom Techn,Chengdu,Sichuan 610041,China |
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| Abstract: | In this paper,the Cramer-Rao low bound (CRLB) for mobile station location based on time of arrival (TOA) in CDMA system is obtained.The detailed deduction and the expression of CRLB are showed and the physical interpretation is discussed.From the CRLB,the conclusion that the CRLB for location is not related with user's numbers is obtained.A new time delay estimation algorithm which can restrain muti-user interferes (MUI) is raised.The method explains the CRLB more sufficiently.The paper discusses some numerical examples based on simulation experiments. |
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| Keywords: | CDMA MUI location TOA time delay estimation CRLB |
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