An Efficient Heterogeneous Ring Signcryption Scheme for Wireless Body Area Networks

Wireless body area networks(WBANs)are an emerging technology for the real-time monitoring of physiological signals.WBANs provide a mechanism for collecting,storing,and transmitting physiological data to healthcare providers.However,the open wireless channel and limited resources of sensors bring security challenges.To ensure physiological data security,this paper provides an efficient Certificateless Public Key Infrastructure Heterogeneous Ring Signcryption(CP-HRSC)scheme,in which sensors are in a certificateless cryptosystem(CLC)environment,and the server is in a public key infrastructure(PKI)environment.CLC could solve the limitations of key escrow in identity-based cryptography(IBC)and certificate management for public keys in PKI.While PKI is suited for the server because it is widely used on the Internet.Furthermore,this paper designs a ring signcryption method that allows the controller to anonymously encrypt physiological data on behalf of a set of sensors,but the server does not exactly know who the sensor is.The construction of this paper can achieve anonymity,confidentiality,authentication,non-repudiation,and integrity in a logically single step.Under the computational Diffie-Hellman(CDH)problem,the formal security proof is provided in the random oracle model(ROM).This paper demonstrates that this scheme has indistinguishability against adaptive chosen ciphertext attacks(IND-CCA2)and existential unforgeability against adaptive chosen message attacks(EUF-CMA).In terms of computational cost and energy usage,a comprehensive performance analysis demonstrates that the proposed scheme is the most effective.Compared to the three existing schemes,the computational cost of this paper’s scheme is reduced by about 49.5%,4.1%,and 8.4%,and the energy usage of our scheme is reduced by about 49.4%,3.7%,and 14.2%,respectively.

Localized Coverage Connectivity Based on Shape and Area Using Mobile Sensor Robots in Wireless Sensor Networks

A wireless sensor network (WSN) is spatially distributing independent sensors to monitor physical and environmental characteristics such as temperature, sound, pressure and also provides different applications such as battlefield inspection and biological detection. The Constrained Motion and Sensor (CMS) Model represents the features and explain k-step reach ability testing to describe the states. The description and calculation based on CMS model does not solve the problem in mobile robots. The ADD framework based on monitoring radio measurements creates a threshold. But the methods are not effective in dynamic coverage of complex environment. In this paper, a Localized Coverage based on Shape and Area Detection (LCSAD) Framework is developed to increase the dynamic coverage using mobile robots. To facilitate the measurement in mobile robots, two algorithms are designed to identify the coverage area, (i.e.,) the area of a coverage hole or not. The two algorithms are Localized Geometric Voronoi Hexagon (LGVH) and Acquaintance Area Hexagon (AAH). LGVH senses all the shapes and it is simple to show all the boundary area nodes. AAH based algorithm simply takes directional information by locating the area of local and global convex points of coverage area. Both these algorithms are applied to WSN of random topologies. The simulation result shows that the proposed LCSAD framework attains minimal energy utilization, lesser waiting time, and also achieves higher scalability, throughput, delivery rate and 8% maximal coverage connectivity in sensor network compared to state-of-art works.

Application of Wireless Local Area Network Technology in Mobile Robot for Finned Tube Inspection

This paper introduces a novel robot for outer surface inspection of boiler tubes. The paper describes the hardware system, wireless communication strategy, communication procedure and system software of the robot. The WLAN technology is used in the robot. It solves the problem of shielding generated by iron boiler and 11Mbps bandwidth made it possible for video and control stream real-time transmit within the same channel. Though TCP/IP protocol is robust, serial server is a transparent channel but cannot detect error and retransmit the data. In order to improve the reliability of serial communication, a new communication protocol is proposed. Key words boiler tubes - mobile robotics - wireless local area network Project Supported by the National High-Tech Program (Grant No. 2002AA420080)

Research on the Teaching Reform of ＂Wireless Local Area Network＂ in the Background of＂Wireless Business Circle＂

This paper proposes the teaching reform of the ＂Wireless Local Area Network＂ in the background of ＂Wireless Business Circle＂ . At present, WLAN technology is becoming more and more mature, the application is then becoming more and more extensive, the campus network will grow rapidly on wireless LAN applications especially the research and higher education institutions on the wireless LAN demand is increasing with wireless LAN will have a very broad market development space. GIS business circle analysis model is to determine business enterprise location or expand their existing business outlets of information necessary to say on the map by G1S visual function of the model. This paper makes the combination of the mentioned items that will then and later influence the performance of the model.

Synchronization in Wireless Networks for Practical MIMO-OFDM Systems

In this paper a frequency offset estimation technique for Wireless Local Area and Wireless Metropolitan Ar- ea Networks is presented. For frequency offset estimation, we have applied a low-complexity frequency offset estimator for simple AWGN channels to fading channels for MIMO-OFDM systems. Simulation results have shown that the performance of the proposed estimator is better than the low complexity frequency offset estimator designed for AWGN channels.

Wireless Communication Networks' Planning in Underdeveloped Countries

The planning of wireless communication networks in underdeveloped countries is studied for landline telephone, fixed broadband wireless access and PLMN systems via investigation and discussion of the LDC networks＇ characteristic, technology selection, deployment consideration, network configuring, civil work evaluation and investment estimation. An example is embedded all through providing a general

Resource Exhaustion Attack Detection Scheme for WLAN Using Artificial Neural Network

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.

基于自发数据传输的高效双LAN太赫兹无线局域网MAC协议

针对现有的双局域网(LAN)太赫兹无线局域网(Dual-LAN THz WLAN)相关介质访问控制(MAC)协议中存在的某些节点会在多个超帧内重复发送相同的信道时隙请求帧以申请时隙资源以及网络运行的一些时段存在空闲时隙等问题,提出一种基于自发数据传输的高效MAC协议——SDTE-MAC(high-Efficiency MAC protocol based on Spontaneous Data Transmission)。SDTE-MAC通过让各节点都维护一张或多张时间单元链表,使各节点与其余节点在网络运行时间上达到同步,从而获悉各节点应该在信道空闲时隙的什么位置开始发送数据帧,优化了传统的信道时隙分配和信道剩余时隙再分配的流程,提高了网络吞吐量和信道时隙利用率,降低了数据时延,能够进一步提升双LAN太赫兹无线局域网的性能。仿真结果表明,网络饱和时,相较于AHT-MAC(Adaptive High Throughout multi-pan MAC protocol)中的N-CTAP(Normal Channel Time Allocation Period)时段时隙资源分配新机制以及自适应缩短超帧时段机制,SDTE-MAC的MAC层吞吐量提升了9.2%,信道时隙利用率提升了10.9%,数据时延降低了22.2%。

模态分解下的无线局域网室内全覆盖通信方法

室内无线局域网的覆盖率是影响用户网络通信效率的关键因素。若室内面积越大以及墙体过厚,且终端使用环境密封会导致通过折射等途径传输通信信号非常微弱,严重影响无线局域网的通信覆盖范围。为此,提出模态分解下的无线局域网室内全覆盖通信方法。通过划分局域网模态单元和确定室内信号振幅阈值,构建模态振幅阈值模型,消除无线局域网室内信号滤波噪声。从终端无线访问节点(AccessPoint,AP)的信号容量和天线传播损耗两方面分析影响无线局域网通信覆盖范围的原因。基于此,利用非朗伯发射器扩充无线局域网终端AP的信号容量,实现无线局域网的室内全覆盖通信。实验结果表明,研究方法应用下无线局域网的室内通信的盲点面积小,覆盖效率更高,实验场景室内通信信息传输率约为6.8Mbit·s^(-1),说明上述方法的可应用性更强。

小波域在无线局域网络信号增强中的应用

为提升无线局域网络信号增强中的去噪效果,应用小波域思想,设计一种无线局域网络信号增强算法.针对无线局域网络,收集无线局域网络原始功率谱数据,通过功率谱拟合因子提取信号特征,识别网络信号.对于识别的无线局域网络信号,通过过零率和短时功率提取该信号.基于小波域对无线局域网络信号实施去噪处理,分为二维小波变换、二进剖分、信号重构三个步骤.通过贝叶斯方法,在实施稀疏字典训练的同时,实现无线局域网络信号的增强处理,在训练中结合K-SVD算法,将信号增强过程和稀疏字典学习过程进行迭代和融合.将MATLAB R2019a作为测试设计算法的实验平台,利用计算机开展算法性能测试.测试结果表明:设计算法的无线局域网络信号增强性能良好,同时信号去噪性能较强,说明算法满足设计需求,在完善细节后可以投入实际应用.

基于Snort-wireless的分布式入侵检测系统研究与设计

为了解决无线局域网存在的安全隐患,该文设计了基于Snort-wireless的分布式入侵检测模型。该模型利用开源、免费和易于扩展的Snort-wireless实现客户端的网络入侵检测引擎,利用VC++开发了控制中心,并且采用加密的TCP/IP协议实现客户端与控制中心之间的安全通信。同时,该模型符合入侵检测的标准框架CIDF,使该模型在性能、重用性以及可扩展性方面得到保证。

PWLAN中802.1x认证的研究与实现

公共无线局域网(PWLAN)作为一种新的公共宽带移动数据接入业务,为公众提供便捷的无线上网服务。然而由于其数据传输链路在物理上的开放性,导致了比有线网络更严重的安全隐患。论述了基于802.1x协议的EAP认证协议及其实现技术,提出了在PWLAN中EAP认证的客户端、认证者端的设计和实现方案。测试结果证明该认证系统能有效地提高PWLAN的安全性。

联合特征概率分布和时间相关性的无线网络业务建模方法

民用无线网络以及航空无线网络等未来无线网络需要承载需求多样化的业务类型和信息交互。数据包尺寸特征和数据包到达间隔等不同业务特征,对无线网络有至关重要的意义。然而,当前无线网络业务建模研究鲜有同时建模业务特征和业务特征的时间相关性,这导致对业务的建模刻画不够准确。本文提出一种联合业务特征概率分布和时间相关性的无线网络业务建模方法,保障了业务特征的概率分布和业务特征的时间相关性。本方法具有一般性,可以应用于民用无线网络的业务建模,也可以应用到航空无线领域,有利于对业务特性的把握,从而进行更加优化和确定性的资源分配。

Wireless-LAN安全及认证方法的研究与分析

首先介绍了无线局域网面临的安全问题,并对无线局域网的安全要求进行了分析;介绍了国内外Wire-less-LAN安全认证机制的研究现状,在此基础上详细分析了基于EAP的无线网络安全认证方法;最后对几种主要的认证方法进行了分析比较。

基于IRF-PF算法的WLAN室内定位方法

针对室内复杂环境下无线局域网接收信号强度的时变波动性,提出一种基于改进随机森林算法并融合粒子滤波的室内定位方法。首先,通过自适应滑动窗口选取接收信号强度较为平滑的信号接入点作为定位指纹特征建立决策树,从而减少特征空间的噪声;然后,利用bagging抽样后的袋外数据赋予决策树不同的投票权重等级,增大决策树类别间判别差异性,优化随机森林算法在目标位置与接收信号强度间弱映射关联性场景下定位精度低的问题,依据改进的随机森林算法建立位置坐标与接收信号强度间的映射模型,计算定位点的位置;最后,为了提高定位准确性与稳定性,将依据改进随机森林算法计算出的位置作为粒子滤波的观测量,利用粒子滤波对目标位置进行估计和预测。在Zenodo数据集上的实验结果表明:提出的算法在定位误差2 m范围内精度达到75.8%,在4 m范围内精度已经高达94.8%;相比于传统随机森林算法,能够将2 m内的定位精度提高11.5%;与K近邻、岭回归和贝叶斯等室内定位算法相比,定位精度和算法实时性也得到明显提升。

车载式铁路轨道巡检数据无线传输加密系统设计

车载式铁路轨道巡检数据在运行中传输中,随着传输数据量的增大,局域网络布局不合理的弊端体现,导致数据传输能力与安全性下降;设计一种车载式铁路轨道巡检数据无线传输加密系统。由车载设备、DMS、无线通信模块、数据接收天线以及数据接收装置搭建数据无线传输加密系统框架,采用多个无线AP构建成局域网络,与车载无线传输网络实时链接并进行铁路轨道巡检数据传输;在系统框架的支持下,分别对系统硬件与软件进行设计;系统硬件主要分为业务逻辑、数据解析和无线通信3个层次;系统软件主要是利用AES对巡检数据进行加密,并获得对应的数字签名,对已加密的数据进行无线网络传输;经系统应用试验证明,当传输时间为5.0 s的情况下,该系统的数据无线传输速度为423 Mbps;当加密次数为5的情况下,该系统的数据加密覆盖率为94%;该系统的丢包率最大值为6.9%,最小值为3.6%,说明该系统具备良好的车载式铁路轨道巡检数据传输能力,且数据加密性能良好,传输速度快。

Energy efficiency aware dynamic rate and power adaptation in carrier sensing based WLANs under Rayleigh fading and shadowing

We consider the problem of energy efficiency aware dynamic adaptation of data transmission rate and transmission power of the users in carrier sensing based Wireless Local Area Networks(WLANs)in the presence of path loss,Rayleigh fading and log-normal shadowing.For a data packet transmission,we formulate an optimization problem,solve the problem,and propose a rate and transmission power adaptation scheme with a restriction methodology of data packet transmission for achieving the optimal energy efficiency.In the restriction methodology of data packet transmission,a user does not transmit a data packet if the instantaneous channel gain of the user is lower than a threshold.To evaluate the performance of the proposed scheme,we develop analytical models for computing the throughput and energy efficiency of WLANs under the proposed scheme considering a saturation traffic condition.We then validate the analytical models via simulation.We find that the proposed scheme provides better throughput and energy efficiency with acceptable throughput fairness if the restriction methodology of data packet transmission is included.By means of the analytical models and simulations,we demonstrate that the proposed scheme provides significantly higher throughput,energy efficiency and fairness index than a traditional non-adaptive scheme and an existing most relevant adaptive scheme.Throughput and energy efficiency gains obtained by the proposed scheme with respect to the existing adapting scheme are about 75%and 103%,respectively,for a fairness index of 0.8.We also study the effect of various system parameters on throughput and energy efficiency and provide various engineering insights.

PWLAN无线传播模型的校正

为了更加合理地规划公共无线局域网(PWLAN),需要对公共无线局域网的射频传播模型进行校正.根据各种典型无线环境下连续波的测试数据和数字地图,对传播模型进行校正,得出在不同环境下传播模型的校正公式.讨论了单变量和多变量的校正法,给出了一个传播模型的校正实例.实践证明,该校正模型在某市公共无线局域网的规划和布网中起到了较好的作用.

Wi-Fi 7核心技术及其应用前景分析

协议命名为802.11be的Wi-Fi 7是IEEE 802.11系列的最新版本,因其引入多链路、4096QAM调制及多AP协作等创新技术,Wi-Fi 7拥有更快的速度、更低的延迟、更大的容量和更好的能效,可很好满足下一代无线局域网对极高吞吐量和极低时延业务的应用需求。同时,由于Wi-Fi 7增加了6 GHz频段和新的带宽模式,拥有丰富的无线信道资源,从而大大减少了设备间干扰,提高了网络的稳定性和可靠性,扩展了其在未来的应用场景。首先对Wi-Fi 7的核心技术进行研究,其次结合其技术特点对其未来可能的发展应用进行探讨。

动车组手持移动终端系统设计及应用

随网络信息化及高速动车组智能化的发展,手持移动终端在轨道交通行业中应用越来越广。介绍当前手持移动终端在高速动车组中的应用现状,结合当前动车组线路运营中巡检实情,设计一种手持移动终端系统,借助PIS系统搭建车厢内专用无线局域网,实现将列车数据单向发送至手持移动终端,通过调整移动终端的信号切换阈值,实现在车厢内移动时实时显示车辆重要部件状态及故障信息,并采取安全控制措施保障车辆的网络安全。