查询词典 estimation

It compares two different estimation methods,"two step subsample bootstrap" based on moment estimation and Maximum Likelihood Estimation, according to their theoretical basis and computation procedures.

讨论了根据极值理论计算受险价值的两类不同的方法：基于矩估计的"两次子样试算法"和极大似然估计法，并给出了各自理论推导过程和计算步骤。

It compares two different estimation methods," two step subsample bootstrap" based on moment estimation and Maximum L ikelihood Estimation , according to their theoretical basis and computation procedures.

讨论了根据极值理论计算受险价值的两类不同的方法：基于矩估计的"两次子样试算法"和极大似然估计法，并给出了各自理论推导过程和计算步骤。

A necessary and sufficient condition for the unbiasedness of Balanced LS Estimation is gained, and for the given L, t can be chosen to make the MSEM of the Balanced LS Estimation less than that of OLS Estimation.

给出了平衡LS估计为无偏估计的充分必要条件，对于给定的L，适当地选择参数t可使平衡LS估计的均方误差矩阵小于OLS估计的均方误差矩阵。

The ambiguity of DOA estimation due to ignorance of the function form of angular signal distribution is analyzed and the DOA estimation without ambiguity is given. 4. A method of DOA estimation of distributed sources is proposed by using the knowledge of the unimodal property of angular signal distribution and independence between different distributed sources.

利用角信号分布函数的共轭对称性，提出了基于噪声子空间的极小最小特征值一维搜索分布式目标DOA估计方法，和基于信号子空间的极大最大特征值一维搜索分布式目标DOA估计方法。

Normal vectors, Gaussian and mean curvatures estimation are obtained by different curvatures estimation methods, and the error is computed by comparing estimation results with real ones on the sphere of unit radius and toms.

在单位球面和环面上，利用不同的曲率估计方法得到法向量以及高斯曲率，平均曲率的估算值，再将估算值与实际值做比较求误差。

In addition, error resource existing in rotor position estimation algorithm is analyzed comprehensibly, therefore, some further work is made to eliminate the negative influence from errors. In this research, additional function is added to rotor position estimation algorithm to enhance precision of position estimation and its feasibility has been proved.

根据已有的无位置传感器转子位置检测原理，提出了两种改进的检测方法：一是改进电感法的检测方法，并设计了检测电路；二是根据SR电机的ψ-I-θ关系，研究了基于模糊推理规则的间接转子位置估算方法，分析了估算过程中存在的误差源，研究了提高估算精度的策略。

Thirdly, the maximum-likelihood CFO estimation algorithms based on null-subcarrier are investigated, and it is shown that the maximum-likelihood CFO estimation algorithm based on equispaced null-subcarriers is equivalent to the CFO estimation algorithm utilizing the correlation of repeated training sequences.

进一步分析了在频率选择性衰落信道下，空载波和信道零点的数目与位置对基于空子载波的载波频偏估计算法可辨识性的影响。

Thirdly, the maximum-likelihood CFO estimation algorithms based on null-subcarrier are investigated, and it is shown that the maximum-likelihood CFO estimation algorithm based on equispaced null-subcarriers is equivalent to the CFO estimation algorithm utilizing the correlation of repeated training sequences.

提出了两种基于时域相关峰值检测的同步估计改进算法：1）采用一个OFDM符号做为训练序列，在接收端进行差分相关以解决时间度量函数中出现的平台效应。

However, blind channel estimation is a very complex, very fargoing research topic. Because of the author's limit ability and time, only the simple subspace channel estimation method is studied. In the third part of this dissertation, the subspace channel estimation method in MIMO-OFDM systems is investigated.

信道盲估计技术因为仅仅根据接收到的序列来估计信道而特别有吸引力，盲估计方法大大提高了通信系统的吞吐量，因此，MIMO-OFDM系统中的盲信道估计技术成为一个研究热点。

Compared with the common LS channel estimation, the iterative algorithm of joint LS channel estimation and signal detection can highly promote the estimation accuracy. Moreover, the lowpass filtering in time domain reduces AWGN and intercarrier interference significantly. It enables OFDM systems to work well in mobile communications.

与一般的LS信道估计相比，基于OFDM的LS信道估计与信号检测的联合迭代算法可较大地提高估计的精度，而且通过时域低通滤波可有效地抑制AWGN和ICI的影响，可使OFDM系统在移动条件下较好地工作。

Hanna: That's over now, isn't it?

都结束了，对吗

You must be ill. You look so pale.

你一定是病了，你的脸色苍白。