稳健性

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

This measure ensures a significant improvement of the network's robustness as verified by computer simulation example, in which some hoise or outliers is added to the input of the network.

通过计算机的仿真实验说明：当所训练的网络输入端有噪声或异常值时，网络具有良好的稳健性，这也证实了该方法的有效性。

RHR divides the whole network into many homocentric rings, and maintains many energy sufficient route paths between neighboring rings; the regular update of key nodes leads to more balanceable energy consumption; every node has many key nodes for transmission, which increase the robustness.

RHR将网络划分为多个同心环，并在环与环之间维护多条能量有效的多跳路径；对关键节点的有序轮换使能耗更加均衡；每个节点可选择多个关键节点，增强了协议的稳健性。

Multidirectional median—mean filter has the specific properties of simple realization structure, robust and efficient filtering performance etc..

其中多方向中值一均值滤波具有实现结构简单、稳健性好且滤波效果也好的特点。

The experimental results show that this method can be carried out simply and has good robusticity.

实验结果表明，用该算法嵌入的图像具有较强的稳健性。

And by disordering the position of the image block that the watermarking pixel embed into,the watermarking is more secure and robust.

同时，将水印点嵌入到图像块中的位置进行随机置乱，提高了水印的安全性以及稳健性。

The experimental results show that the algorithm enhances the reliability and robustness of tracking.

实验表明，该算法提高了跟踪的准确性和稳健性。

Using jackknifed method, the model possessed better predictability and robustness.

用Jackknife法检验该模型具有良好的稳健性与预测能力，其计算值与实验值基本吻合。

During the jackknife tests, either randomly deleting a certain amounts of compounds or specifically deleting a class of compounds, the jackknifed R〓 were distributed around the original R〓.

估算K〓和BCF的分子连接性指数模型稳健性良好，按随机抽除和类别抽除两种方式进行的jackknife检验中，模型可决系数变化不大，基本围绕在原始模型可决系数附近波动。

The system can be made more robust in other ways.

还有其他方法可以增强金融体系的稳健性。

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％。