查询词典 wireless telegraphy

Compared with uncoded system, the Turbo-coded optical wireless system improves the performance of optical wireless link because Turbo code compensates losses and noises of link and improves jamming-rejection ca...

比较了基于Turbo码的大气无线光通信系统与未编码大气无线光通信系统，发现Turbo码技术能够很好地补偿和克服各种衰减和噪声，提高了系统的抗干扰能力，使系统的性能得到了很大的提高。

The new release supports IP devices, including the new Software House Wireless Access Control System and C·CURE Mobile, a hand-held wireless device that secures entrances at unwired locations.

新版本支持IP设备，包括SoftwareHouse公司新的无线出入口控制系统和C·CURE移动系统，手持式无线装置提高了无线站点的安全性。

With the development of Internet and wireless data communication technologies, wireless Internet access becomes a new hot spot.

随着Internet技术和无线数据通信技术的不断发展，无线互联网接入成为新的热点。

First of all, this paper concludes the general research routine and procedures in wireless mesh networks and introduces related research methods and results of different procedures: firstly, it makes classification and comparison of the classic routing protocols in mobile ad hoc networks; secondly, it introduces several ways in which the classic ad hoc routing protocols can be modified to be used in the wireless mesh networks; thirdly, it makes detailed explanations of some typical routing protocols in each way above.

首先本文总结了无线Mesh网络路由协议的一般性研究路线，并按该研究路线的各阶段分析和总结了相关的研究方法与研究成果：先对移动Ad hoc网络的经典路由协议进行分类和比较；在此基础上总结了将Ad hoc路由协议应用于无线Mesh网络的几种主流的改进思路；最后对各种改进思路的代表性路由协议进行了分析和讨论。

The wireless sensor network has attracted great attention of the world, and is an emerging researching area with multi-discipline interleaving. It intergrates sensor technology, embedded computation technology, network and wireless communication technology, distributed information processing In real time, It detects, apperceives and collects the information of various enviroments or objects with the collaboration of kinds of IC sensors.

无线传感器网络是当今国内外备受关注的、由多学科高度交叉的新兴前沿研究领域，它综合了传感器技术、嵌入式计算技术、现代网络及无线通信技术、分布式信息处理技术等，能够通过各类集成化的微型传感器协作，实时监测、感知和采集各种环境或监测对象的信息。

Based on the requisition of wireless system debugging, this paper develops a novel radio-frequency beaconing. Design method and system constitution of a novel beaconing based on PLL IC PE3336 are given, and the accomplish method of the system's hardware and software arc expounded. The test results show that the beaconing adopted in this method has a reliable and stable frequency conversion features. The more applications in the wireless system find that the users can set necessary frequency conveniently. Especial1, the friendly man-machine interface makes the operation is more flexible. It is as excellent performance-price-ratio beaconing, and as a signal source, it can be used in the research and the debug procession of variable radio-frequency components.

根据无线电数据链系统及部件的调试需要，研制开发了一种新型的以锁相环为核心、由单片机控制的射频信标机；文中给出了基于锁相环芯片PE3336的新型信标机的设计方法与系统组成，阐述了系统硬件及软件的具体实现为法；测试结果表明，利用该方法设计的信标机具有稳定、可靠的变频特性，且各项指标均达到了要求；进一步在某无线电系统中的应用发现，用户可方便地设置所需频点；特别是友好的人机界面，使用户操作更为灵活方便，是一种性能价格比优良的信标机；并可作为信源用于不同的射频部件研制与调试过程中。

Its ideal is that modulation mode can be adaptively adjusted by estimating such wireless parameters as fading degree,channel traffic and etc. Channel capacity will achieve a maximum and system performance will be best anytime. By this way,although mobile wireless channel broadband is more and more congesting today,adaptive modulation can be provided preferable spectral efficiency and can be increased the information transmission rate.

它的主要思想是通过研究无线信道的衰落程度、信道流量等参数动态地改变调制方式，在任何时刻都使信道容量达到最大或者使系统性能达到最佳，从而使移动无线信道频带日益拥挤的今天能得到较高的频谱利用率，有效地提高信息传输速率、从而提高传输系统的带宽。

the study aims at the actual network status of one work section in daqing oil field,makes a network analysis and planning for the new mixed model of this work section,expends wireless network for the work section on the basis of existing network,and conjoins wire and wireless network together to form an integrated oil field information transfer system.at the same time,using opnet modeler simulation flat roof to structure simulation models (network models,node models and a process model),and analyzing the functions and work mechanism of the major modules for related models,making a simulation for the structured network models,then according to the different parameters,analyzing the individual statistics comparatively such as delay,data dropped and so on,the effects of data packet,data rate and fragmentation threshold to the network performance are gained.after all these,the best structure network scheme for this improved section is determined.

摘 要：此项研究主要针对大庆油田某作业区的实际网络现状，对该作业区进行网络分析和规划，在该作业区现有的有线网络基础上扩充无线网络，实现有线网与无线网的综合，构成一个完整的油田传输信息体系。同时利用opnet modeler仿真平台为该作业区新建混合网络建立仿真模型(网络模型、节点模型和进程模型)，分析相关模型中主要模块的作用和工作机理，对已建立的网络模型进行仿真，在不同的参数设置下，通过对比分析时间延迟、丢包率等统计特性，得出数据包分组、数据率和拆分门限对网络性能的影响，最终决定改进网络的最佳组网方案。

It also enforces wireless regulatory measures for wireless transmission by users in the country.

它还执行无线管制措施的无线传输，用户在该国。

The fluctuation of available wireless link bandwidth motivates the study of adaptive multimedia services in wireless/mobile networks This paper focusses on a bandwidth adaptation scheme, which takes the maximum revenue as the objective The optimal bandwidth adaptation algorithm which seeks to achieve maximum revenue is an NP hard problem, because it has to investigate every adaptation case A bandwidth adaptation scheme based on genetic algorithm is proposed, which achieves near optimal total revenue with much less complexity compared to an optimal bandwidth adaptation algorithm Simulation is carried out to compare the algorithm with an optimal bandwidth adaptation algorithm, the results reveal that the genetic algorithm approximates the optimal solution very well

无线链路带宽的快速波动推动了无线/移动网络中对适应的多媒体服务的研究以无线网络系统的利润最大化为目标，研究适应的多媒体应用的带宽适应方案达到利润最大化的最优带宽适应算法是一个NP hard问题提出一个基于遗传算法的带宽适应方案，在算法复杂度大大低于最优算法的同时，获得的利润值近似最优性能分析和实验结果证明了这一结论1 引言因特网和无线/移动通信技术的迅速发展，推动了两者服务的融合无线/移动环境下因特网服务的提供需要解决的一个关键问题是QoS保证提供QoS保证的一个重要技术手段是连接接纳控制 [1] CAC算法的目标是在保证切换连接请求丢弃率满足系

Methods Clinical data of 3 cases of bile duct injury during laparoscopic cholecystectomy were analyzed retrospectively.

回顾总结3例LC术中胆管损伤的临床资料，分析3例胆管损伤的原因及对策。

These techniques are applied to the gobang.

本文将这些技术用于五子棋中。