分类：设计开发    下载：0    浏览：374    时间：2017-07-29

程浩，史杏荣 (中国科学技术大学电子工程与信息科学系信息处理中心，合肥 230027) 摘要：研究了从无线到有线网的基于IEEE802.11e和DiffServ(区分服务)的端到端的QoS结构，介绍了802.11e、802.1D/Q和DiffServ的特点，并就它们之间的优先级映射进行了分析，从流量分类、标记、整形方面对IEEE802.11e和DiffServ的QoS参数提出了分级的接口。 关键词：无线局域网；802.11e；DiffServ；QoS End-to-End QoS Architecture Based on IEEE802.11e and DiffServ CHENG Hao, SHI Xingrong (Information Processing Center, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230027) 【Abstract】This paper studies an end to end QoS architecture between wireless and wire based on DiffServ and IEEE802.11e, introduces thecharacters of 802.11e, 802.1D/Q and DiffServ, analyzes priorities mapping each other and presents the hierarchical QoS parameters interfacebetween DiffServ and 802.11e in terms of traffic classifying, markering and shaping. 【Key words】WLAN; 802.11e; DiffServ; QoS

分类：设计开发    下载：2    浏览：464    时间：2017-07-29

王 军1,2,3，王宏1，徐皑冬1，周侗1 （1. 中国科学院沈阳自动化研究所，沈阳 110016；2. 中国科学院研究生院，北京 100039； 3. 沈阳化工学院计算机科学与技术学院，沈阳 110142） 摘 要：EPA是我国第一个拥有自主知识产权的现场总线标准，现已正式成为IEC的PAS文件。作者在参与开发出“基于无线局域网的EPA网络控制系统”的相关设备后，分析和探讨了为适应不同需要的EPA若干无线与有线网段集成的方案。同时，提出了一种符合EPA标准的无线现场总线设备结构的实现模型。从而为实现了EPA进一步向无线工业现场总线进军提供了一定的理论基础。 关键词：EPA；集成模式；无线现场总线 Research of Integrated Wired/Wireless Fieldbus on EPA WANG Jun1,2,3, WANG Hong1, XU Aidong1, ZHOU Tong1 (1.Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016; 2. Graduate School, Chinese Academy of Sciences, Beijing 100039; 3. School of Computer Science & Technology, Shenyang Institute of Chemical Technology, Shenyang 110142) 【Abstract】The EPA profile that is the first industry Ethernet profile of China is constituted. It has been a PAS in IEC. After the authordevelopedequipment of EPA network control system on WLAN, the paper analyses and expatiates some methods for an integrated hybrid(wired/wireless) EPAfieldbus to adapt to different conditions, and provides a model of wireless fieldbus equipment framework on EPA. It provides some theoryfoundation for EPA occupying more market on wireless fieldbus. 【Key words】EPA; Integration mode; Wireless fieldbus

分类：设计开发    下载：2    浏览：493    时间：2017-07-29

王春东1,2，王秀峰1 (1. 南开大学信息科学技术学院，天津 300071；2. 天津理工大学计算机科学与工程系，天津 300191) 摘要：研究了在基于802.11的系统中，如何通过信号强度进行移动设备的室内定位。在研究并实现最大群中心定位算法MCCPA的基础之上，给出了一种利用移动终端的历史位置信息对定位结果进行修正的室内定位算法(MMCCPA)。其主要思想是，在给定前一时间使用者所在位置的条件下，将使用者出现在特定范围的概率列入考量加以修正，并作为对环境因素影响的调整，这样不仅减少计算量，而且明显提高了位置估算的正确率。 关键词：无线网络；信号强度；定位算法；802.11；历史记录 Research on 802.11-based Indoor Positioning Algorithm WANG Chundong1,2, WANG Xiufeng1 (1. College of Information Science Technology, Nankai University, Tianjin 300071; 2. Dept. of Computer Science & Engineering, Tianjin University of Technology, Tianjin 300191) 【Abstract】This paper focuses on how to position the mobile device indoor by using signal strength in 802.11-based system. It introduces a802.11-based positioning system called the maximal cluster centered positioning algorithm (MCCPA). The MCCP system locates mobile objects viacollecting the sensed power strengths of the mobile objects to multiple wireless access points. Based on realizing MCCPA, the paper gives a newalgorithm named MMCCPA to correct the positioning results by using the history record information of mobile devices. The main idea of MMCCPAis that it also considers the probability of users’ appearance in the specific area in order to correct results, as an adjustment to the environmentfactors, so as to increase the preciseness and decrease the count quantity.The experimental results show that the location information provided byMMCCPA assures higher correctness than MCCPA. 【Key words】Wireless networks; Signal strength; Positioning algorithm; 802.11; History record

分类：设计开发    下载：0    浏览：398    时间：2017-07-29

陈 侃1，李 华1，潘春建2，谭红艳2 (1. 河南信阳职业技术学院，信阳 464000；2. 中国科学院声学所高性能网络实验室，北京100080) 摘 要：基于对集中式WLAN无线资源管理框架的分析，提出了相关的负载均衡控制算法和准入控制算法。通过和相关算法仿真对比可以看出：所提算法能够使WLAN系统更有效地均衡各个无线接入点的业务流量，最大限度地满足接入服务。 关键词：集中式WLAN网络；无线资源管理；负载均衡 Research on Radio Resource Management of Centralized WLAN Network CHEN Kan1, LI Hua1, PAN Chunjian2, TAN Hongyan2 (1. Xinyang Vocational and Technical College, Xinyang 464000; 2. High Performance Network Lab, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080) 【Abstract】Based on the analysis on the radio resource management of centralized WLAN network, this paper puts forward the load balancecontrolling algorithm and the access control algorithm. According to correlated simulation comparison, the algorithms can balance the traffic amongthe access points more effectively and meet the maximum access service. 【Key words】Centralized WLAN network; Radio resource management; Load-balance

分类：设计开发    下载：0    浏览：699    时间：2017-07-29

俞建如1，王萍2，王能1，钱红微1，魏勇2 (1. 华东师范大学计算机系，上海 200062；2. 上海无线通讯研究中心，上海 200021) 摘要：分析了宽带无线系统中所承载业务的QoS需求，提出了一种用模拟业务来测试网络QoS的技术。在探讨业务特性参数提取的基础上，实现了VoIP业务在Ixia设备上的模拟过程，并用该模拟数据对Wimax设备进行了测试。同基于实际业务的网络QoS测试技术相比，该技术具有定量性、通用性、灵活性的优点。 关键词：宽带无线系统；服务质量；业务模拟；Wimax QoS Test Technology for Broadband Wireless System YU Jianru1, WANG Ping2, WANG Neng1, QIAN Hongwei1, WEI Yong2 (1. Computer Science & Technology Department, East China Normal University, Shanghai 200062; 2. Shanghai Research Center for Wireless Communications, Shanghai 200021) 【Abstract】The paper analyses QoS requirement of different services in broadband wireless system. The method of service-simulation is proposedto test QoS of a network. Based on detail discussion on the service-characteristic parameters, the VoIP traffic pattern is simulated by Ixia testingdevice. A real test on Wimax device is carried out using the simulated traffic. Compared to the method based on real-service, this method has suchadvantages: quantity measurement, generality, flexibility.

分类：设计开发    下载：5    浏览：1279    时间：2017-07-29

摘要：介绍如何使用C51RF-2 无线单片机开发系统，开发三种无线SoC(片上系统)cc1010/nRF24E1/nRF9E5，如何评估芯片，无线通讯软件库使用，快速调试，发现和排除在高频通讯中的软件和硬件存在的问题，软件加密等，给出温度无线传感器网络产品开发实例、库的使用和程序源代码等。 关键词 无线 SoC 51 系列开发工具

分类：设计开发    下载：0    浏览：708    时间：2017-07-29

王 进，蒋亚丽，李大兴，贾忠田 (山东大学网络信息安全研究所，济南 250100) 摘要：以NIST RBAC参考模型为基础，引入地理域和逻辑域的概念，对RBAC模型作了空间维扩展：通过用户-角色或角色-权限的动态分配，用户只拥有在其所在位置的所需权限；对角色的授权约束加入空间特性，使之能够形式化描述多个层面的空间职责分离约束，从而适用于无线网络的应用环境。 关键词: 访问控制；角色；空间；约束 Extended Role-based Access Control Model for Wireless Network WANG Jin, JIANG Yali, LI Daxing, JIA Zhongtian (Institute of Information and Network Security, Shandong University, Jinan 250100) 【Abstract】An extended RBAC model with spatial character is presented. By dynamically changing user-role or role-permission assignments, it ispossible to control the available set of permissions based on where the user is situated. This paper also extends a role-based authorization constraintmodel to describe constraints with spatial character on different levels, which is suited for wireless network. 【Key words】Access control; Role; Spatial; Constraint

分类：设计开发    下载：0    浏览：352    时间：2017-07-29

刘 新，吴秋峰 (清华大学自动化系，北京 100084) 摘要：无线个域网(WPAN)是当前计算机网络发展最为迅速的领域之一。目前比较典型的无线个域网技术可分为5类：红外，家庭射频，蓝牙，超宽带和Zigbee。该文介绍了几种技术的主要特点及其相关标准和协议，并对这些技术的应用范围和市场发展前景作了分析和比较。 关键词：无线个域网；红外数据标准协会；蓝牙；超宽带；Zigbee Wireless Personal Area Network Techniques and Related Protocols LIU Xin, WU Qiufeng (Automation Department, Tsinghua University, Beijing 100084) 【Abstract】Wireless personal area network (WPAN) is one of the most mushroom fields in current computer networks. At present typical WPANtechnologies can be divided into five classes: IrDA, HomeRF, Bluetooth, Ultra-wideband and Zigbee. This paper introduces the characters andrelated standards/protocols of these technologies, the application areas and development prospects are analyzed and compared. 【Key words】Wireless personal area network (WPAN); Infrared data association (IrDA); Bluetooth; Ultra-wideband; Zigbee

分类：设计开发    下载：6    浏览：985    时间：2017-07-29

无线局域网经过几年的发展，在技术上已经日渐成熟。尤其是IEEE推出802.11-1999和802.11b以来，应用也日渐广泛。无线局域网硬件实现的两大主要部分是基带处理器和MAC控制器，软件部分包括驱动网卡本身工作的嵌入式软件和网络设备驱动程序。在本文中，首先介绍了小端口驱动程序的基本要点，然后给出了基于Driver Studio开发PCMCIA接口编程I/O（Programmed IO）方式工作的无线局域网网卡NDIS（网络驱动程序接口标准），并讨论了小端口驱动程序实现过程中的若干关键技术的细节。

分类：设计开发    下载：0    浏览：345    时间：2017-07-29

饶国威，杜明辉，万 泉 （华南理工大学电子与信息工程学院，广州 510641） 摘要：对基于IEEE 802.11机制的无线局域网中移动隐藏终端的存在问题和性能进行了分析，在此前提下提出了一种动态自适应的改进算法，并对该算法进行了仿真，得出了该算法能改进移动隐藏终端性能的结论。 关键词：马可夫过程；移动隐藏终端；FT；RTS Adaptive Algorithm of Mobile and Hidden Terminals in WLAN RAO Guowei, DU Minghui, WAN Quan (College of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641) 【Abstract】This article analyses theproblem and performance of mobile and hidden terminals of IEEE 802.11 WLAN. Based on that, it presents anadaptive algorithm . The results of simulations prove that the algorithm can improve the performance of mobile and hidden terminals. 【Key words】Markov process; Mobile and hidden terminal; FT; RTS

分类：设计开发    下载：0    浏览：354    时间：2017-07-29

赵春晓1,2，王丽君1，马靖善1，王光兴3 （1. 渤海大学信息科学与工程学院，锦州121000；2. 北京工业大学国际WIC研究院，北京 100022； 3. 东北大学信息科学与工程学院，沈阳110004） 摘 要：网络仿真在自组网开发过程中评估新的协议性能的基本技术，该文介绍了网络建模问题，比较了各种传统路由算法和自组网算法。讨论了自组网的确定性和不确定性建模，分析了NS、OPNET和MATLAB等几种仿真工具。基于不确定建模原理，使用MATLAB和C设计并实现了一个无线自组网路由仿真器。 关键词：无线自组网络；不确定性建模；仿真；路由 Uncertain Modeling and Simulation for MANET ZHAO Chunxiao1,2, WANG Lijun1, MA Jingshan1, WANG Guangxing3 (1. School of Information Science & Engineering, Bohai University, Jinzhou 121000; 2. International WIC Institute, Beijing University of Technology, Beijing 100022; 3. School of Information Science & Engineering, Northeastern University, Shenyang 110004) 【Abstract】Ad-hoc network simulation is a basic technique of evaluating new technologies in the development of new network protocols. Themodeling problem of network is introduced and a review of the available literature in the field of ad hoc network routing is compared. Then thecertain and uncertain modeling are discussed. Several simulation tools such as NS, OPNET and MATLAB are analyzed. Based on uncertainmodeling philosophy, a wireless ad hoc networks simulator is designed and implemented with MATLAB and C. 【Key words】Wireless ad-hoc network; Uncertain modeling; Simulation; Routing

分类：设计开发    下载：0    浏览：355    时间：2017-07-29

李 锌，尹宝才，杨猛，苏海斌 (北京工业大学多媒体与智能软件技术北京市重点实验室，北京 100022) 摘 要：提出了一种新的图像多描述编码算法，给出了多描述分解的算法和规则，并结合运动补偿时间域滤波(MCTF)进行多描述间的编码，针对无线信道的特点提出了多描述间分层的概念，以适应无线信道传输。实验结果表明，提出的空域分层多描述图像编码(spatial-layer multiple image coding, SL-MDIC)算法有效地利用了MCTF编码的特点，提高了中央信道的编码性能，同时对于收到单个描述或部分描述，解码的图像仍能获得较好的重构图像。 关键词：多描述编码；图像处理；数据丢失；运动补偿时域滤波；提升小波 Multiple Description Image Coding forWireless LI Xin, YIN Baocai, YANG Meng, SU Haibin （Beijing Municipal Multimedia and Intelligent Software Key Laboratory in Beijing University of Technology, Beijing 100022） 【Abstract】This paper presents a new multiple description method for coding image. The proposed algorithms are based on a combination of motion compensated temporal filtering technique(MCTF) applied to the construction of some of the most efficient scalable video coding. The result on natural image reveal spatial layer multiple description image coding(SL-MDIC) make use of MCTF. This algorithm improves the performance of the centre channel effectively, and even if only one description is received correctly, the reconstructed image is still acceptable. 【Key words】Multiple description coding; Image processing; Packet loss; Motion compensated temporal filtering; Lifting wavelet