查询词典 data transmission

Indeed, for some decades now, power line wires have been ? used for low-speed data communication, culminating in such standards and products as LonWorks, CEBus, and X-10, as well as many proprietary systems for the transmission of control and management signals.

事实上，在最近的几十年，电力线已经被用于低速数据通信，在Lon Works，CEBus，and X-10等电力线标准中都有提及和应用，特别是在一些特定系统中用于传输控制和管理信号。

Non-data-aided SNR estimation is considerer for M-PSK transmission over additive white Gaussian noise channels.

非数据辅助的信噪比估计被认为是对加性高斯白噪声信道下MPSK信号进行估计。

In the paper, a brand new measuring proposal which developed the foundation of conversional grating measurement has been introduced. It applies the electronic ocular (which essential element is CMOS image sensor) to the length measurement and uses the digital image processing technique subdivide the grating image in order to improve the distinguishability and accuracy of the system, and make the data processing, saving and transmission much more easier in the meantime.

本课题在现有的光栅计量基础上提出了一种全新的测量技术方案：结合现有的光栅计量技术，以电子目镜(核心元件为CMOS图像传感器)作为光电转换器件应用于长度测量系统，并采用计算机图像处理技术对测量的光栅图像进行数字化细分，以达到较高的系统分辨率及测量精度，并且使测量数据的处理、保存和传输更加简便。

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。

For the problem of data inconsistence in transmission of Wireless sensor networks,we propose a mechanism of Inconsistent Failures Detection Mechanism which is based on wireless sensor networks.

针对无线传感器网络数据传输过程中产生的非一致性问题，提出了一种基于无线传感器网络的非一致性故障检测机制IFDM(Inconsistent Failures Detection Mechanism)。

With the emergence of the global economic crisis, the status of agriculture is getting more and more important ineconomic development. In this environment, the require of the precision control of the environment factors that crops need if getting more and more high, so the key is the collection and transmission of various types of the basic data. The new technology of Wimesh is the solution of this problem.

摘 要：全球经济危机的出现，使得农业在一个国家的经济发展中的地位日益凸显，在这样的环境下，农业生产领域中对农作物所需求的环境因素的精细控制要求愈来愈高，因而涉及各类基础数据的收集及传输就是其中的的关键，而新兴的Wimesh技术所具备的特色使得其在这样的精细农业生产中大有用武之地。

The prototype has achieved Long-distance power supply by data bus, IEC61158-2 transmission technology and essential function of PROFIBUS-DP and can be connected to DP fieldbus system for transparent communication between the two sort of feildbus segment by DP/PA coupler and can be communicated with the DP master inerrably and continuously according to the primary PROFIBUS-DP communication protocol and process realization of state machine.

论文取得的主要成果包括：在国内目前允许的技术条件下，找到了一个PA产品开发的可行性方案，设计出能够通过数据总线进行远程供电PA原理型样机，实现了IEC61158-2传输技术以及PROFIBUS-DP基本功能，能够通过DP/PA耦合器将样机接入DP总线系统实现两类总线段间的透明传输，并按照状态机过程实现与主站的连续正确通信。

Mechanism of Gas mass transmission of rotating jet will be researched though a serial of synthetic and intersectant research methods and technique route such as theoretical analysis, experimental research, computer data processing and industrial experiment etc. It will be applied to the fields of gas control in the mine.

通过理论分析、热成像实验研究、计算机数据处理和现场试验等综合交叉研究方法和技术路线，综合研究了旋转径向射流排放瓦斯的传质机理，并将其应用于煤矿井下的瓦斯灾害领域。

With the accumulation of field data study and the application of cell transmission model in urban network traffic control successfully and the development of network reliability study, the acquaintance degree of oversaturation enforces gradually.

随着实际控制平台上拥挤状态控制研究的积累、元胞传输模型在城市路网交通控制问题中的突破性应用和路网可靠性问题研究的深入，使得对过饱和控制问题的认识程度逐步加深。

The reliable transmission of instructions and data is achieced, and the intelligent management of electric power database and an automaticly perambulatory detection are brought to success.

实现命令和数据的可靠传输，用电数据库的智能管理和自动巡检。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。