查询词典 estimation

To solve the problem that the-spectrum estimation performance based on covariation under the-stable noise environmentbecomes obviously worse when the distribution parameter is small,a method of fractional low-order covariance spectrum estimation was proposed.

针对在分布参数值较小时稳定分布噪声下基于共变的谱估计性能较差这一问题，提出了一种分数低阶协方差谱估计方法。

a scheme of channel estimation using cyclic prefix based on the measurement of the low-voltage power line channel model is presented.after obtaining the frequency response of pilot sub-channel under the state of comb-type pilot,the data sub-channel response is obtained by interpolating the frequency response in frequency direction.in the pilot-free data period,the estimation of the channel is carried out by using cyclic prefix in order to improve the performance of system error rate.

摘 要：通过实际测量给出低压电力线的信道模型，在此基础之上提出了利用循环前缀对信道进行估计的方法，即在梳状导频模式时，使用导频获得导频子信道频率响应后，对其在频域方向进行插值得到数据子信道响应，在其后没有导频的序列的数据周期内，使用循环前缀对信道进行估计，从而起到改善系统误比特性能的目的。

Time-Frequency parameter estimation and direction finding for nonstationary signals impinging on an antenna array over a wide frequency band (2~18GHz) is under in-vestigation, and a new method for parameter and 2-D Angle-Of-Arrival estimation of spatio-temporal undersampled LFM sources is proposed in this paper.

摘要针对宽频段(2-18GHz)内非平稳来波信号的参数估计和测向问题，提出一种时空欠采样线性调频信号参数与二维到达角联合估计方法。

In order to eliminate the noise during channel estimation, a new channel estimation algorithm based on discrete Fourier transform is presented.

该文讨论了MC-CDMA的导频插入方式，提出一种基于离散傅里叶变换的信道估计算法。

Because it is necessary for wind speed estimation to consider the variation of air density, a method to implement air density estimation by discrete sampling of the state of DFIG is proposed.

准确的风速估计必须考虑空气密度的变化，给出通过对风机状态的离散采样实现空气密度估计的方法，利用修正后的空气密度对风速进行更为准确的估计，从而得到最优的转速设定，实现风能的最大捕获。

Combined with statistical based Bayesian estimation and adaptive distribution parameter estimation, an effective denoising algorithm is gained.

结合贝叶斯估计技术和自适应分布参数确定方法，给出了有效的图像去噪算法。

Improve algorithm to adjust the window of every phase as close as position of bandwidth estimation, network connection to rise, combinative network position and bandwidth estimation judge the rationality of congest window, adjust congest window dynamicly, when making congest is about to happen, the window can drop in time appropriate level, avoid what bring about as a result of congest to be lost in group as far as possible.

改进算法将每个阶段的窗口调整和带宽估计、网络状态紧密联系起来，结合网络状态和带宽估计判定拥塞窗口的合理性，动态地调整拥塞窗口，使拥塞即将发生时，窗口能及时下降到适宜的水平，尽量避免由于拥塞而导致的分组丢失。

This book also studies the problems of fault processing in geological mapping, and cross section making, as well as related problems of variogram estimation, and dual form of Kriging estimation.

本书还讨论了地质绘图过程中断层处理的问题，和剖面图绘制问题，以及变异函数估算中有关问题，和克里金估计方法的对偶形问题。

In this paper, started with the most elementary probability formula of Fisher matrix for time delay estimation, some properties of the Fisher matrix for time delay, Doppler shift and its hither derivatives joint estimation are exploited by use of Toeplitz matrix chracteristics in passive location systems.

本文从时延估计的Fisher矩阵的最基本概率表达式入手，利用Toerlitz矩阵性质，对无源定位中时延、多普勒及其更高阶导数联合估计的Fisher矩阵的性质进行分析。

Robust M-estimation is discussed after the relationship between the influence function and the robust estimation. The equivalent weighted functions of DM method and IGG method are also listed.

在介绍了稳健估计与影响函数之间的关系后，重点阐述了稳健 M-估计的一般性原理，给出了 DM 法和 IGG 方案的等价权函数。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。