作　　者： ; ; ;

机构地区： 西北工业大学航海学院

出　　处： 《计算机仿真》 2005年第11期135-139,共5页

摘　　要： 相关背景噪声下的时延估计问题是现阶段的一个研究热点。在时延估计的众多算法中,属于“约束”类算法,ETDE(explicit tim e delay estimation)算法具有适用性广、可靠性高、计算量小和实时性好等优点。文中首次将ETDE算法扩展到相关背景噪声领域。首先从理论上分析了在相关背景噪声下ETDE算法的估计效果,得出了时延估计的期望表达式。指出在此种情况下,ETDE算法得到的是时延的有偏估计,且偏差量与时延真值、信噪比以及背景噪声间互相关函数值的大小有关。最后通过计算机仿真验证了理论结果。 In recent years, it has been paid much attention to the problem of Time Delay Estimation （TDE） in correlated noise environment. Among many algorithms of TDE, the ETDE （explicit time delay estimation）algorithm belongs to the ＂constrained＂ algorithms, it has many merits such as wide applicability, high reliability, less compuation and good ability for real - time. This paper is the first one to expand the ETDE algorithm to the correlated noise environment. At the beginning, the estimation effect of ETDE algorithm in correlated noise environment is analyzed in theory, and the expected value of time delay is derived. Then it denotes that in this condition, the ETDE algorithm provides a biased delay estimation. The biasness is related with the real value of time delay, signal to noise ratio and the cross correlation value of two channels of noise. At last, simulation results validate the theory very well.

关 键 词： 时延估计 约束 相关背景噪声

领　　域： [电子电信] [电子电信]