无线资料 - 设计开发-无线下载-AP固件WiFi软件

分类: 全部无线软件项目方案无线资料固件天线设计驱动字典 UBNT专区专题

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适用于无线网络的RBAC扩展模型

分类：设计开发下载：0 浏览：671 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

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无线个域网技术及相关协议

分类：设计开发下载：0 浏览：320 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

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无线局域网NDIS小端口驱动实现

分类：设计开发下载：6 浏览：942 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。

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无线局域网中移动隐藏终端的自适应算法

分类：设计开发下载：0 浏览：308 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

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自组网的不确定性建模与仿真

分类：设计开发下载：0 浏览：327 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

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一种无线信道多描述图像编码算法

分类：设计开发下载：0 浏览：320 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