Time-Delay Estimation in the Multi-Path Channel based on Maximum Likelihood Criterion

被引:4
作者
Xie, Shengdong [1 ,2 ]
Hu, Aiqun [1 ]
Huang, Yi [1 ]
机构
[1] Southeast Univ, Sch Informat Sci & Engn, Nanjing 210096, Jiangsu, Peoples R China
[2] Nanjing Univ Informat Sci & Technol, Comp & Software Inst, Nanjing 210044, Jiangsu, Peoples R China
来源
KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS | 2012年 / 6卷 / 04期
关键词
Multi-path propagation channel; time-delay estimation; maximum likelihood criterion; subspace fitting algorithm; CRLB; SIGNALS;
D O I
10.3837/tiis.2012.04.006
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
To locate an object accurately in the wireless sensor networks, the distance measure based on time-delay plays an important role. In this paper, we propose a maximum likelihood (ML) time-delay estimation algorithm in multi-path wireless propagation channel. We get the joint probability density function after sampling the frequency domain response of the multi-path channel, which could be obtained by the vector network analyzer. Based on the ML criterion, the time-delay values of different paths are estimated. Considering the ML function is non-linear with respect to the multi-path time-delays, we first obtain the coarse values of different paths using the subspace fitting algorithm, then take them as an initial point, and finally get the ML time-delay estimation values with the pattern searching optimization method. The simulation results show that although the ML estimation variance could not reach the Cramer-Rao lower bounds (CRLB), its performance is superior to that of subspace fitting algorithm, and could be seen as a fine algorithm.
引用
收藏
页码:1063 / 1075
页数:13
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