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 .
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 multi-user interferes (MUI) is raised. The method explains the CRLB more sufficiently. The paper discusses some numerical examples based on simulation experiments.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2005年第1期131-134,共4页
Acta Electronica Sinica
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
Algorithms
Computer simulation
Estimation
Mathematical models
Mobile telecommunication systems
Signal processing
