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Traffic-Aware Channelization Medium Access Control for Wireless Ad Hoc Networks 被引量:2
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作者 史春光 赵海涛 +2 位作者 张少杰 马东堂 魏急波 《China Communications》 SCIE CSCD 2013年第4期88-100,共13页
Existing multi-channel Medium Access Control (MAC) protocols have been demonstrated to significantly increase wireless network performance compared to single channel MAC protocols. Traditionally, the channelization st... Existing multi-channel Medium Access Control (MAC) protocols have been demonstrated to significantly increase wireless network performance compared to single channel MAC protocols. Traditionally, the channelization structure in IEEE 802.11 based wireless networks is pre-configured, and the entire available spectrum is divided into subchannels and equal channel widths. In contrast, this paper presents a Traffic-Aware Channelization MAC (TAC-MAC) protocol for wireless ad hoc networks, where each node is equipped with a single half duplex transceiver. TAC-MAC works in a distributed, fine-grai-ned manner, which dynamically divides variable-width subchannels and allocates subchannel width based on the Orthogonal Frequency Division Multiplexing (OFDM) technique according to the traffic demands of nodes. Simulations show that the TAC-MAC can significantly improve network throughput and reduce packet delay compared with both fixed-width multi-channel MAC and single channel 802.11 protocols, which illustrates a new paradigm for high-efficient multi-channel MAC design in wireless ad hoc networks. 展开更多
关键词 wireless ad hoc networks multi-channel MAC TAC IEEE 802.11
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Performance Improvement of DCF Supporting Multi-Rate in IEEE 802.11b Wireless LAN 被引量:1
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作者 葛卫民 张亮 舒炎泰 《Transactions of Tianjin University》 EI CAS 2007年第4期276-281,共6页
This paper proposes a new channel access algorithm based on channel occupancy time (COT) fairness to guarantee fairness and improve the aggregate throughput of 802.11b multi-rate WLANs. In the algorithm, the COT is ... This paper proposes a new channel access algorithm based on channel occupancy time (COT) fairness to guarantee fairness and improve the aggregate throughput of 802.11b multi-rate WLANs. In the algorithm, the COT is used as fairness index to analyze the fairness of WLANs instead of the channel access probability (CAP) used in the distributed coordination function (DCF). The standard COT is given by access point (AP) and broadcasted to all wireless stations. The AP and wireless stations in the WLAN can achieve COT-based fairness by adjusting their packet length, sending the multiple back-to-back packets at one time, or giving up an opportunity to access the channel. Analysis and simulations show that our algorithm can provide COT-fairness. Compared with the CAP-based algorithm, the proposed algorithm leads to improvements in aggregate throughput of IEEE 802. lib multi-rate WLANs. 展开更多
关键词 IEEE 802.11b wireless LAN MULTI-RATE THROUGHPUT FAIRNESS
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IEEE 802.11s Wireless Mesh Networks for Last-Mile Internet Access: An Open-Source Real-World Indoor Testbed Implementation 被引量:1
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作者 Riduan M. Abid Taha Benbrahim Saad Biaz 《Wireless Sensor Network》 2010年第10期725-738,共14页
Due to their easy-to-deploy and self-healing features, WMNs (Wireless Mesh Networks) are emerging as a new promising technology with a rich set of applications. While the IEEE standardization of this new technology is... Due to their easy-to-deploy and self-healing features, WMNs (Wireless Mesh Networks) are emerging as a new promising technology with a rich set of applications. While the IEEE standardization of this new technology is still in progress, its main traits are already set, e.g., architecture and MAC routing. WMNs are attracting considerable research in academia and industry as well, but the lack of open-source testbeds is restricting such a research to simulation tools. The main problem with simulation tools is that they do not reflect the complexity of RF propagation, especially in indoor environments, of which IEEE 802.11s WMNs are an example. This paper presents an open-source implementation of an indoor IEEE 802.11s WMN testbed. The implementation is transparent, easy-to-deploy, and both the source code and deployment instructions are available online. The implementation can serve as a blueprint for the WMN research community to deploy their own testbeds, negating the shortcomings of using simulation tools. By delving into the testbed implementation subtleties, this paper is shedding further light on the details of the ongoing IEEE 802.11s standard. Major encountered implementation problems (e.g., clients association, Internetworking, and supporting multiple gateways) are identified and addressed. To ascertain the functionality of the testbed, both UDP and TCP traffic are supported and operational. The testbed uses the default IEEE 802.11s HWMP (Hybrid Wireless Mesh Protocol) routing protocol along with the default IEEE 802.11s Airtime routing metric. 展开更多
关键词 wireless MESH networks IEEE 802.11s Hybrid wireless MESH Protocol Airtime Routing METRIC
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On the Performability of Hierarchical Wireless Networked Control Systems
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作者 Esraa A. Makled Hassan H. Halawa +2 位作者 Ramez M. Daoud Hassanein H. Amer Tarek K. Refaat 《Intelligent Control and Automation》 2015年第2期126-133,共8页
This paper investigates the performability of hierarchical Wireless Networked Control Systems (WNCS). The WNCS studied can operate in two modes: passive supervisor and active supervisor. It is first shown that the Mar... This paper investigates the performability of hierarchical Wireless Networked Control Systems (WNCS). The WNCS studied can operate in two modes: passive supervisor and active supervisor. It is first shown that the Markov models for both modes are identical. Performability models are then developed and a case study shows how to use these models to help make design decisions. More specifically, it is observed that the performability of a passive supervisor system increases in time while that of an active supervisor system decreases in time. 展开更多
关键词 PERFORMABILITY CTMC FAULT-TOLERANCE wireless networkED Control Systems HIERARCHICAL networks IEEE 802.11
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Full Duplex Media Access Control Protocol for Multihop Network Computing
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作者 J.Avila Selvi Therase S.Allwin A.Ahilan 《Computer Systems Science & Engineering》 SCIE EI 2023年第1期297-309,共13页
Intelligent communication technologies beyond the network are pro-posed by using a new full-duplex protocol.The Media Access Control(MAC)is a data interaction network protocol,which outperforms the IEEE 802.15.4e.This... Intelligent communication technologies beyond the network are pro-posed by using a new full-duplex protocol.The Media Access Control(MAC)is a data interaction network protocol,which outperforms the IEEE 802.15.4e.This research discusses the planning and execution of full-duplex(FD)pipeline MAC protocol for multihop wireless networks(MWN).The design uses a com-bination of Radio frequency and baseband methods to realize full-duplexing with smallest impact on cross layer functions.The execution and trial results specify that Pipeline Media Access Control(PiMAC)protocol considerably develops net-work implementation in terms of transmission protocol(TP)and transmission delay.The advantage of using FD-MAC will increase the range of nodes.Also takes benefit of the FD mode of the antenna,which outperforms additionally 80%for all assessed cases.In this analysis,it was considered of that Psz=8184 bits and Rc=1Mbps;that’s,T_(DATA) represents an excellent portion of total UTC.Tests on real nodes displays that the FD theme achieves a median gain of 90%in mix-ture throughput as equated to half-duplex(HD)theme for MWN.The energy con-sumption of proposed system method is 29.8%reduced when compared with existing system method. 展开更多
关键词 Beyondfifth-generation(B5G) FD MAC wi-finetworks wireless relay network multihop wireless networks
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Resource Exhaustion Attack Detection Scheme for WLAN Using Artificial Neural Network
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作者 Abdallah Elhigazi Abdallah Mosab Hamdan +6 位作者 Shukor Abd Razak Fuad A.Ghalib Muzaffar Hamzah Suleman Khan Siddiq Ahmed Babikir Ali Mutaz H.H.Khairi Sayeed Salih 《Computers, Materials & Continua》 SCIE EI 2023年第3期5607-5623,共17页
IEEE 802.11 Wi-Fi networks are prone to many denial of service(DoS)attacks due to vulnerabilities at the media access control(MAC)layer of the 802.11 protocol.Due to the data transmission nature of the wireless local ... IEEE 802.11 Wi-Fi networks are prone to many denial of service(DoS)attacks due to vulnerabilities at the media access control(MAC)layer of the 802.11 protocol.Due to the data transmission nature of the wireless local area network(WLAN)through radio waves,its communication is exposed to the possibility of being attacked by illegitimate users.Moreover,the security design of the wireless structure is vulnerable to versatile attacks.For example,the attacker can imitate genuine features,rendering classificationbased methods inaccurate in differentiating between real and false messages.Althoughmany security standards have been proposed over the last decades to overcome many wireless network attacks,effectively detecting such attacks is crucial in today’s real-world applications.This paper presents a novel resource exhaustion attack detection scheme(READS)to detect resource exhaustion attacks effectively.The proposed scheme can differentiate between the genuine and fake management frames in the early stages of the attack such that access points can effectively mitigate the consequences of the attack.The scheme is built through learning from clustered samples using artificial neural networks to identify the genuine and rogue resource exhaustion management frames effectively and efficiently in theWLAN.The proposed scheme consists of four modules whichmake it capable to alleviates the attack impact more effectively than the related work.The experimental results show the effectiveness of the proposed technique by gaining an 89.11%improvement compared to the existing works in terms of detection. 展开更多
关键词 802.11 media access control(MAC) wireless local area network(WLAN) artificial neural network denial-of-service(DoS)
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蓝牙与802.11b的干扰与共存问题 被引量:5
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作者 朱刚 谈振辉 《北方交通大学学报》 CSCD 北大核心 2004年第2期1-7,共7页
由于使用相同频段,使得蓝牙网络与IEEE802.11b无线局域网之间存在干扰,严重影响系统正常工作.本文首先分析了蓝牙网络与IEEE802.11b无线局域网之间存在干扰情况,然后对于克服干扰实现两者共存诸方法进行分析与评述,以期为相关问题的深... 由于使用相同频段,使得蓝牙网络与IEEE802.11b无线局域网之间存在干扰,严重影响系统正常工作.本文首先分析了蓝牙网络与IEEE802.11b无线局域网之间存在干扰情况,然后对于克服干扰实现两者共存诸方法进行分析与评述,以期为相关问题的深入研究给出背景. 展开更多
关键词 无线通信 蓝牙 无线个域网 IEEE 802.11b 无线局域网 干扰 共存机制
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蓝牙与802.11b相互干扰分析 被引量:1
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作者 朱刚 王欣 谈振辉 《铁道学报》 EI CAS CSCD 北大核心 2004年第3期108-113,共6页
由于使用相同频段,使得蓝牙网络与IEEE802.11b无线局域网之间存在干扰,严重影响系统正常工作。本文主要对蓝牙网络与IEEE802.11b无线局域网之间存在干扰情况进行分析与综述,然后简要介绍了克服干扰实现两者共存的方法,以期为相关问题的... 由于使用相同频段,使得蓝牙网络与IEEE802.11b无线局域网之间存在干扰,严重影响系统正常工作。本文主要对蓝牙网络与IEEE802.11b无线局域网之间存在干扰情况进行分析与综述,然后简要介绍了克服干扰实现两者共存的方法,以期为相关问题的深入研究给出背景。 展开更多
关键词 蓝牙 无线个域网 802.11b 无线局域网 干扰 共存机制
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WPAN应用环境下IEEE802.11b最优包长 被引量:2
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作者 谷金山 沈连丰 +2 位作者 苏红平 邱晓华 黄忠虎 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2005年第5期659-663,共5页
为了提高W PAN应用环境下IEEE802.11b的吞吐量,首先分析IEEE802.11b DCF协议应用时的数据包传输时序,得到IEEE802.11b系统的吞吐量性能与包长及包错误概率的关系,然后对W PAN干扰网络存在时包错误概率与PLCP服务数据单元(PSDU,PLCP serv... 为了提高W PAN应用环境下IEEE802.11b的吞吐量,首先分析IEEE802.11b DCF协议应用时的数据包传输时序,得到IEEE802.11b系统的吞吐量性能与包长及包错误概率的关系,然后对W PAN干扰网络存在时包错误概率与PLCP服务数据单元(PSDU,PLCP service data u-nit)值之间的关系进行建模.在理论上证明了在一定的W PAN干扰强度下,IEEE802.11b系统存在一个最佳的数据包长度,可以使得系统的吞吐量最大.在此基础上提出了W PAN干扰网络存在时的自适应包长方案.仿真结果表明,所提方案可以有效地提高网络吞吐量. 展开更多
关键词 无线个域网 蓝牙 IEEE 802.11b
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基于前导码的WLAN 802.11b频偏估计算法 被引量:3
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作者 方晗 缪蔚 洪志良 《电路与系统学报》 CSCD 北大核心 2007年第3期143-146,共4页
本文针对频偏估计算法估值范围与估值精度难以两全的矛盾提出分两步进行的纯数字频偏估计算法。第一步是不需要辅助数据的粗频偏估计,第二步则是基于辅助数据的细频偏估计。理论与仿真结果表明该算法具有估值范围大﹑精度准的优点,并且... 本文针对频偏估计算法估值范围与估值精度难以两全的矛盾提出分两步进行的纯数字频偏估计算法。第一步是不需要辅助数据的粗频偏估计,第二步则是基于辅助数据的细频偏估计。理论与仿真结果表明该算法具有估值范围大﹑精度准的优点,并且计算量小,非常适用于高速突发的现代数字通信系统。 展开更多
关键词 802.11b 频偏估计 无线通信 无线局域网
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基于IEEE 802.11b和CDMA网的多路监控系统的设计与实现 被引量:1
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作者 王恒 李勇 +1 位作者 王泉 赵双 《计算机技术与发展》 2008年第6期192-194,198,共4页
提出了一种基于IEEE 802.11b和CDMA网的远程监控系统,监控现场设备之间通过无线局域网相连接,监控现场设备与远程控制设备之间通过CDMA2000-1X移动通信网和Internet网相连接,可通过后台软件、Web服务器和手机短信等多路方式进行远程监... 提出了一种基于IEEE 802.11b和CDMA网的远程监控系统,监控现场设备之间通过无线局域网相连接,监控现场设备与远程控制设备之间通过CDMA2000-1X移动通信网和Internet网相连接,可通过后台软件、Web服务器和手机短信等多路方式进行远程监控。阐述了该系统的总体结构,给出了基于嵌入式技术的软硬件实现方案,并进行了测试。结果表明,本监控系统具有不受现场布线束缚、监控设备可自由移动、监控手段灵活多样等优点。 展开更多
关键词 IEEE 802.11b CDMA 远程监控 无线监控 嵌入式系统
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基于NS2的改善802.11b无线网络传输效果异常仿真研究 被引量:1
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作者 刘书如 冯媛 蔡增玉 《郑州轻工业学院学报(自然科学版)》 CAS 2012年第6期90-92,共3页
针对多速率802.11b无线网络环境的数据传输效果异常现象,提出了一种在多速率无线网络环境下改善802.11b无线网络传输效果异常的新方法.该方法根据不同的数据传输速率同时调整数据帧及竞争窗口大小.仿真结果表明,该方法可以有效改善802.... 针对多速率802.11b无线网络环境的数据传输效果异常现象,提出了一种在多速率无线网络环境下改善802.11b无线网络传输效果异常的新方法.该方法根据不同的数据传输速率同时调整数据帧及竞争窗口大小.仿真结果表明,该方法可以有效改善802.11b无线网络传输效果异常现象. 展开更多
关键词 无线网络 传输效果异常 NS2 802.11b 数据帧
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A Low Noise,High Linearity CMOS Receiver for 802.11b WLAN Applications
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作者 黄煜梅 王静光 +1 位作者 王金菊 洪志良 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第9期1708-1714,共7页
A 2.4GHz monolithic CMOS receiver with direct-conversion architecture is presented. This quadrature receiver is designed for 802.11b wireless LAN applications at the maximum data rate of 11Mbps as a low-cost solution.... A 2.4GHz monolithic CMOS receiver with direct-conversion architecture is presented. This quadrature receiver is designed for 802.11b wireless LAN applications at the maximum data rate of 11Mbps as a low-cost solution. Five key blocks,i, e., a low noise amplifier (LNA), a down-conversion mixer, a variable gain amplifier, a low pass filter, and a DC- offset cancellation circuit,are designed based on system design and low noise high linearity considerations. The necessary auxiliary circuits are also included. Fabricated in SMIC 0.18μm 1p6m RF CMOS process, the receiver's performance is measured as:4. 1 dB noise figure, - 7.5dBm input third order intercept point (IIP3) for LNA & mixer at high gain setting, - 14dBm IIP3 for the whole receiver,53dBc @30MHz offset of adjacent channel power rejection,and less than 5mV out- put DC-offset. The receiver consumes 44mA under a 1.8V power supply with I,Q two paths. 展开更多
关键词 802.11b wireless LAN RECEIVER DC-offset cancellation MIXER
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基于802.11b MAC协议的Ad Hoc路由算法仿真与比较 被引量:1
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作者 林克明 《计算机工程与设计》 CSCD 北大核心 2006年第16期3032-3035,共4页
主要利用NS2仿真分析了AdHoc网络模式中几个主要的路由(DSR、DSDV、TORA、AODV)算法进行研究。首先,利用NS-2测试4种路由协议的性能,讨论AdHoc模式下路由协议的设计。不同的路由协议,主要包括先验式和反应式两大类,有不同的适用场合,混... 主要利用NS2仿真分析了AdHoc网络模式中几个主要的路由(DSR、DSDV、TORA、AODV)算法进行研究。首先,利用NS-2测试4种路由协议的性能,讨论AdHoc模式下路由协议的设计。不同的路由协议,主要包括先验式和反应式两大类,有不同的适用场合,混合式的路由协议(AODV)有一定的优越性;然后,测试节点个数和数据包容量对无线网络MAC层性能(包括延迟、丢包率和吞吐率)的影响。结论为不同场合路由协议的进一步应用和优化提供理论依据。 展开更多
关键词 802.11b NS AD HOC 网络仿真 无线局域网
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分析蓝牙和IEEE802.11b在技术上的差异 被引量:1
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作者 群诺 《西藏大学学报(社会科学版)》 2005年第3期72-80,共9页
随着计算机网络迅猛的发展和普及,INTERNET时代即将进入第二代。其中无线网络技术成为全球最为关注的网络技术之一,并得到不断的发展。文章就围绕无线网络技术,重点分析当前比较流行的两种无线网络蓝牙和IEEE802.b在技术上的差异。
关键词 无线网络 蓝牙 IEEE802.b 访问点 差异
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An adaptive joint source and channel coding scheme for H.264 video multicasting over wireless LAN 被引量:1
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作者 LIU Zheng-ye LIU Hang WANG Yao 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第5期837-846,共10页
This paper proposes an adaptive joint source and channel coding scheme for H.264 video multicast over wireless LAN which takes into account the user topology changes and varying channel conditions of multiple users, a... This paper proposes an adaptive joint source and channel coding scheme for H.264 video multicast over wireless LAN which takes into account the user topology changes and varying channel conditions of multiple users, and dynamically allocates available bandwidth between source coding and channel coding, with the goal to optimize the overall system performance. In particular, source resilience and error correction are considered jointly in the scheme to achieve the optimal performance. And a channel estimation algorithm based on the average packet loss rate and the variance of packet loss rate is proposed also. Two overall performance criteria for video multicast are investigated and experimental results are presented to show the improvement obtained by the scheme. 展开更多
关键词 MULTICAST OVER 802.11 wireless local area networks (WLAN) Adaptive joint source and channel coding H.264
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基于802.11b标准的港口无线视频监控系统前端设备设计
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作者 刘珂 封斌 《广州航海高等专科学校学报》 2010年第1期14-17,共4页
基于802.11b标准的无线视频监控系统前端设备,采用ARM920T内核的S3C2410处理器,与剪裁后的Linux2.6.14内核组成系统平台,移植了相关外设的驱动程序.应用层程序使用Video4Linux提供的API函数进行视频采集,并对视频数据按照MPEG4标准进行... 基于802.11b标准的无线视频监控系统前端设备,采用ARM920T内核的S3C2410处理器,与剪裁后的Linux2.6.14内核组成系统平台,移植了相关外设的驱动程序.应用层程序使用Video4Linux提供的API函数进行视频采集,并对视频数据按照MPEG4标准进行编码,用socket接口实现网络传输.整个系统建立在嵌入式系统架构上. 展开更多
关键词 S3C2410 linux VIDEO4LINUX 802.11b 无线视频监控系统
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Performance Study of a Cross-Layer Based Multipath Routing Protocol for IEEE 802.11e Mobile Ad Hoc Networks
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作者 Hang SHEN Guangwei BAI +2 位作者 Junyuan WANG Yong JIN Jinjing TAO 《International Journal of Communications, Network and System Sciences》 2008年第4期329-338,共10页
Communication over wireless links identifies significant challenges for routing protocols operating. This paper proposes a Cross-layer design based Multipath Routing Protocol (CMRP) for mobile ad hoc networks, by mean... Communication over wireless links identifies significant challenges for routing protocols operating. This paper proposes a Cross-layer design based Multipath Routing Protocol (CMRP) for mobile ad hoc networks, by means of the node energy signal from the physical layer. The purpose is to optimize routing decision and path quality. The nodes’ mobility behavior is predicted using a notion of “Signal Fading Degree, SFD”. Especially, in combination of the IEEE 802.11e standard at the MAC layer, we determine that the IEEE 802.11e makes a significant contribution to performance improvement of CMRP. Performance evaluation of AODV in legacy 802.11 and CMRP in IEEE 802.11e shows that, as a function of speed of node mobility, a tremendous reduction achieved, in metrics such as the average end-to-end delay, route overhead, route discovery frequency, normalized routing load - almost more than 80%, 40%, 40%, and 40%. In the case of varying number of sessions, the reduction for route discovery frequency and normalized routing load are up to 70% and 80%. 展开更多
关键词 wireless Mobile Ad HOC networks MULTIPATH ROUTING CROSS-LAYER Design IEEE 802.11e
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无线以太网(IEEE 802.11b)技术在铁路列车编组站中的应用
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作者 王耀阳 《铁路通信信号工程技术》 2005年第5期31-34,共4页
本文对无线以太网(IEEE 802.11b)技术在铁路列车编组场无线通信系统中的应用进行了讨论。通过分析铁路列车编组场的业务需求和无线以太网技术的技术特点,论证了无线以太网技术应用于铁路站场通信的可能性及必要性。结合铁路列车编组站... 本文对无线以太网(IEEE 802.11b)技术在铁路列车编组场无线通信系统中的应用进行了讨论。通过分析铁路列车编组场的业务需求和无线以太网技术的技术特点,论证了无线以太网技术应用于铁路站场通信的可能性及必要性。结合铁路列车编组站的具体应用背景提出了无线以太网技术在列车编组站中应用的实现方式及网络结构。依据铁路列车编组场的实际情况和对无线以太网设备进行的实验结果,分析了在工程应用中应考虑的主要技术问题。 展开更多
关键词 编组站 无线通信系统 无线以太网 IEEE 802.11 b 漫游 网络安全 以太网技术 铁路列车
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面向802.11b非对称无线网络容量优化的部分重叠信道分配方案
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作者 潘晨 孙有铭 +2 位作者 段焱磊 杨正举 张玉立 《通信技术》 2018年第10期2365-2374,共10页
针对现有802.11b无线网络中部分重叠信道(POC)分配方案大多基于无向加权干扰图而忽略了实际网络中由于各链路传输功率和接收机灵敏度等因素导致的干扰不对称性问题,提出了一种有向加权图的非对称无线网络POC分配方案来优化802.11b非对... 针对现有802.11b无线网络中部分重叠信道(POC)分配方案大多基于无向加权干扰图而忽略了实际网络中由于各链路传输功率和接收机灵敏度等因素导致的干扰不对称性问题,提出了一种有向加权图的非对称无线网络POC分配方案来优化802.11b非对称无线网络的全网容量。首先,构建有向加权干扰图,同时刻画信道距离、物理距离以及干扰不对称性;其次,将面向802.11b无线网络容量最优化的POC分配方案建模为局部互利博弈模型,网络中的每条链路是博弈的参与者,且效用函数设计为自身链路容量和潜在被干扰邻居链路的容量和;再次,证明所提博弈模型为势能博弈,存在至少一个纯策略纳什均衡点,同时最优纯策略纳什均衡为全网容量最优化的解;最后,设计了一个基于邻域合作的分布式多用户学习方案,实现了最优纳什均衡点的搜索。仿真表明,所提分布式学习方案可近似收敛到最优解,相比于现有其他算法可明显提高全网容量。 展开更多
关键词 802.11b无线网络 非对称干扰 部分重叠信道 势能博弈 学习算法
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