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New RPL Protocol for IoT Applications 物联网应用的新RPL协议
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2021-0094
Nariman Najeeb Hadaya, S. Alabady
The Objective Function (OF) can be used by the Routing protocol for low power lossy networks (RPL) to construct a Destination Oriented Directed Acyclic Graph (DODAG) based on routing metrics. The standard OFs suffer from long hops when selecting the route, which may cause consume the node’s energy faster. In this paper, we suggest an improvement of RPL OF that considers three metrics. The results show that the proposed protocol increases network lifetime by reducing energy consumption, increasing efficiency, increasing Packet Delivery Ratio (PDR), and decreasing packet loss ratio. In terms of PDR, packet loss ratio, and average power consumption, the best performance of the proposed protocol is shown in the network with 70 nodes and when the transmission range is 50m. Compared with the MRHOF, the proposed protocol increased the PDR by 58.425%, decreased the packet loss ratio by 0.21765, and decreased the total power consumption by 181.815mW. In terms of the average Expected Transmission Count (ETX) the best performance of the proposed protocol is shown in the network with 60 nodes and the transmission range is 40m. The proposed protocol reduced the average ETX by 49 compared to the MRHOF.
低功耗网络(RPL)路由协议可以利用目标函数(OF)来构造基于路由指标的目标导向无环图(DODAG)。标准OFs在选择路由时存在跳数较长的问题,可能导致节点能量消耗较快。在本文中,我们提出了一种考虑三个指标的RPL of改进方法。结果表明,该协议通过降低能耗、提高效率、提高包投递率(Packet Delivery Ratio, PDR)和降低丢包率来提高网络寿命。在PDR、丢包率和平均功耗方面,该协议在70个节点的网络中,传输距离为50m时性能最佳。与MRHOF相比,该协议的PDR提高了58.425%,丢包率降低了0.21765,总功耗降低了181.815mW。在平均期望传输数(ETX)方面,该协议在60个节点、传输距离为40m的网络中表现出最佳性能。与MRHOF相比,提议的协议将平均ETX减少了49%。
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引用次数: 1
Extending the Lifetime of Wireless Sensor Networks Based on an Improved Multi-objective Artificial Bees Colony Algorithm 基于改进多目标人工蜂群算法的无线传感器网络寿命延长
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2022-0055
Salima Nebti, M. Redjimi
— Reducing the sensors' energy expenditure to prolong the network lifespan as long as possible remains a fundamental problem in the field of wireless networks. Particularly in applications with inaccessible environments, which impose crucial constraints on sensor replacement. It is, therefore, necessary to design adaptive routing protocols, taking into account the environmental constraints and the limited energy of sensors. To have an energy-efficient routing protocol, a new cluster heads’ (CHs) selection strategy using a modified multi-objective artificial bees colony (MOABC) optimization is defined. The modified MOABC is based on the roulette wheel selection over non-dominated solutions of the repository (hyper-cubes) in which a rank is assigned to each hypercube based on its density in dominated solutions of the current iteration and then a random food source is elected by roulette from the densest hypercube. The proposed work aims to find the optimal set of CHs based on their residual energies to ensure an optimal balance between the nodes' energy consumption. The achieved results proved that the proposed MOABC-based protocol considerably outperforms recent studies and well-known energy-efficient protocols, namely: LEACH, C-LEACH, SEP, TSEP, DEEC, DDEEC, and EDEEC in terms of energy efficiency, stability, and network lifespan extension.
-减少传感器的能量消耗,尽可能延长网络寿命,仍然是无线网络领域的一个基本问题。特别是在难以进入的环境中,这对传感器的更换施加了关键的限制。因此,有必要在考虑环境约束和传感器能量有限的情况下设计自适应路由协议。为了实现高效节能的路由协议,定义了一种基于改进的多目标人工蜂群优化的簇头选择策略。改进的MOABC是基于对存储库(超立方体)的非主导解的轮盘赌轮盘选择,其中每个超立方体根据其在当前迭代的主导解中的密度分配一个等级,然后通过轮盘赌从密度最大的超立方体中选择一个随机食物源。提出的工作旨在根据节点的剩余能量找到最优的节点集,以确保节点的能量消耗达到最优平衡。研究结果表明,本文提出的基于moabc的协议在能效、稳定性和网络寿命延长方面明显优于当前研究和知名的节能协议LEACH、C-LEACH、SEP、TSEP、DEEC、DDEEC和EDEEC。
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引用次数: 0
On the Applicability of Numerical Quadrature for Double Surface Integrals at 5G Frequencies 5G频率下二重曲面积分数值求积分的适用性
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2021-0183
M. Cvetković, Ante Lojić Kapetanović, D. Poljak, H. Dodig
—The human exposure assessment to wireless com- munications systems including the fifth generation (5G) mobile systems is related to determining the specific absorption rate (SAR) or the absorbed power density (APD). The assessment of both quantities requires the use of various numerical techniques, including moments method (MoM). As the use of MoM results in a fully populated system matrix, a tremendous computational cost is incurred, both in terms of matrix fill time and memory allocation, as the matrix size is directly related to frequency of the problem. This paper investigates the applicability of numerical integration at frequencies related to 5G. The novelty of this work is related to the comprehensive set of tests of various combination of source and observation triangles using the developed unit cube test. A number of convergence tests were performed to investigate the effects of the increasing frequency and the discretization scheme on the numerical solution, as well as to determine how to curb the computational requirements by the proficient use of numerical integration. The results show that in the lower GHz range, lower integration orders could be used, resulting in the decrease of matrix fill time without loss of solution accuracy.
-人类对无线通信系统(包括第五代(5G)移动系统)的暴露评估与确定特定吸收率(SAR)或吸收功率密度(APD)有关。这两个量的评估需要使用各种数值技术,包括矩量法(MoM)。由于MoM的使用导致系统矩阵被完全填充,因此在矩阵填充时间和内存分配方面产生了巨大的计算成本,因为矩阵大小与问题的频率直接相关。本文研究了数值积分在5G相关频率上的适用性。这项工作的新颖之处在于,利用开发的单位立方体测试,对源三角形和观测三角形的各种组合进行了综合测试。为了研究频率增加和离散化方案对数值解的影响,并确定如何熟练使用数值积分来抑制计算量的要求,进行了一系列收敛性试验。结果表明,在较低的GHz范围内,可以采用较低的积分阶数,在不影响求解精度的情况下减少矩阵填充时间。
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引用次数: 4
In Search of Micromodels: Black-box Evaluation of Spatio-temporal Models in Normal and Extreme Conditions 寻找微观模型:正常和极端条件下时空模型的黑箱评估
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2022-0092
Ivana Nižetić Kosović, Toni Mastelić, Domina Sokol, Diana Škurić Kuražić
—Spatio-temporal modelling is an emerging research area due to the increasing availability of sensor data collected across space and time. The models are build either with a model- driven or data-driven approach. The former often results in complex monolith models that are not suitable for lightweight Edge deployment. The latter requires a vast amount of data and may not provide an overall good performance. Consequently, the data-driven approach is being used to substitute only parts of model-driven outputs, by creating micromodels that tackle spe- cific scenarios. The main contribution of this paper is a definition and demonstration of the process for finding such scenarios for which a spatio-temporal model could be improved or replaced by a micromodel and deployed on Edge. The process is demonstrated on an example of a Numerical Weather Prediction model (NWP), namely its outputs of temperature and precipitation. NWP is evaluated using black-box testing considering the specificity of spatial and temporal components, in both normal and extreme conditions. The novelty of this process is its ability to highlight weaknesses of the existing expert models and suggest scenarios in which the models can be improved and deployed on the Edge.
时空建模是一个新兴的研究领域,因为越来越多的传感器数据收集跨越空间和时间的可用性。模型是用模型驱动或数据驱动的方法构建的。前者通常会导致复杂的单体模型,不适合轻量级边缘部署。后者需要大量的数据,可能无法提供良好的整体性能。因此,通过创建处理特定场景的微模型,数据驱动的方法被用于仅替代部分模型驱动的输出。本文的主要贡献是定义和演示了寻找这些场景的过程,在这些场景中,时空模型可以被改进或替换为微模型并部署在Edge上。以数值天气预报模式(NWP)的温度和降水输出为例,演示了这一过程。在正常和极端条件下,考虑到空间和时间成分的特殊性,使用黑盒测试来评估NWP。这个过程的新颖之处在于它能够突出现有专家模型的弱点,并提出可以在边缘上改进和部署模型的场景。
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引用次数: 0
Multi-Connectivity in 5G and Beyond Non-Terrestrial Networks 5G和超越非地面网络的多连接
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2022-0155
Mikko Majamaa, H. Martikainen, Lauri Sormunen, J. Puttonen
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引用次数: 2
A New Analytical Model for SIM–OFDM Contradicts the Previously Claimed Features 一种新的SIM-OFDM分析模型与先前宣称的特性相矛盾
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2021-0198
A. N. Jabbar, Samir J. Almuraab, A. Kadhim
— The Subcarrier Index Modulation OFDM (SIM– OFDM) appeared in 2009 promising a –3 dB transmitted power reduction without affecting the system performance. Therefore, it became an attractive choice to upgrade the communication systems with researchers’ increasing interest. Despite the research efforts in SIM–OFDM field, there was no in-depth investigation for such transmitted power reduction or the system’s performance. The claimed power reduction relies on probabilistic assumptions that were not validated considering system operation concepts. This paper provides a new analytical model that characterizes the actual SIM–OFDM behavior. The contribution of this model is the inclusion of the majority condition in the derivation of 1’s pmf which modifies the 1’s pmf into a complex nonlinear function that is always higher than 1/2. The new pmf effect upon the power reduction, synchronization, and the overall Bit Error Rate ( BER ) is investigated. The new analytical model shows that the –3 dB power reduction cannot be achieved. Also, no successful synchronization can be established unless extra subcarrier is added that will create a frame like communication system. Such scheme increases BER if the carrier is falsely detected creating a Frame Error Rate ( FER ) which might lead to serious problem.
- 2009年出现的子载波指数调制OFDM (SIM - OFDM)承诺在不影响系统性能的情况下降低- 3 dB的传输功率。因此,随着研究人员的兴趣日益浓厚,对通信系统进行升级成为一个有吸引力的选择。尽管在SIM-OFDM领域进行了大量的研究,但对传输功率的降低和系统性能的影响还没有深入的研究。声称的功率降低依赖于未考虑系统操作概念的概率假设。本文提出了一种新的分析模型来描述SIM-OFDM的实际行为。该模型的贡献在于在1的pmf的推导中包含了多数条件,将1的pmf修改为一个始终大于1/2的复杂非线性函数。研究了新的pmf对降低功耗、同步和总体误码率(BER)的影响。新的分析模型表明,3 dB的功耗降低是无法实现的。此外,除非添加额外的子载波以创建类似帧的通信系统,否则无法建立成功的同步。这种方案增加了误码率,如果载波被错误检测产生帧误码率(FER),这可能导致严重的问题。
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引用次数: 1
Finite Radon Transform as Subcarriers Mapping Technique for OFDM System OFDM系统的有限Radon变换子载波映射技术
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2022-0043
K. Samarah
—Radon Transform (RT) becomes a mathematical basis for solving computerized tomography, and finds application in medical imaging and image processing. Finite groups represent digital images; the Finite Radon Transform (FRAT) is then applied. To overcome the periodization effect of a finite transform, Do and Vetterli [1] introduce a novel ordering of the FRAT coefficients. This paper introduced a detailed mathematical analysis of the optimal ordering of FRAT coefficients that introduces new normal vectors that are clearly identified with examples producing the FRAT transform. Lately FRAT is used with OFDM systems as an M-Ary mapping technique, thus, the signal constellation of some of the different orders of FRAT is presented as well as generating the OFDM symbols from the output of FRAT. This procedure leads to extra investigation on the performance of FRAT-based OFDM systems in comparison with the QAM mapping techniques.
radon变换(RT)成为求解计算机断层成像的数学基础,并在医学成像和图像处理中得到应用。有限群表示数字图像;然后应用有限Radon变换(FRAT)。为了克服有限变换的周期化效应,Do和Vetterli[1]引入了一种新的FRAT系数排序方法。本文对FRAT系数的最优排序进行了详细的数学分析,引入了新的法向量,并通过产生FRAT变换的例子清楚地识别了这些法向量。近年来,将FRAT作为一种M-Ary映射技术应用于OFDM系统中,给出了不同阶FRAT的信号星座,并从FRAT的输出中生成OFDM符号。这一过程导致了对基于frat的OFDM系统的性能与QAM映射技术的比较的额外研究。
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引用次数: 0
State Transition Analysis of GSM Encryption Algorithm A5/1 GSM加密算法A5/1的状态转移分析
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2021-0104
P. Gundaram, A. Tentu, Swamy Naidu Allu
—A5/1 stream cipher is used in Global System for Mobile Communication(GSM) phones for secure communication. A5/1 encrypts the message transferred from a mobile user. In this paper, we present the implementation of cryptanalytic on A5/1 techniques such as minimized state recovery for recovering the session key. The number of state transitions/updations needed for a state S to reoccur is maintained in the lookup table. This table can be used to recover the initial state from which the keystream was produced. Experiments are carried out for reduced version, full A5/1 cipher on 3.20 GHz machine, and cluster computing facility.
-A5/1流密码用于全球移动通信系统(GSM)电话的安全通信。A5/1对来自移动用户的消息进行加密。在本文中,我们提出了基于A5/1技术的密码分析实现,例如用于恢复会话密钥的最小化状态恢复。重新出现状态S所需的状态转换/更新次数保存在查找表中。该表可用于恢复生成密钥流时的初始状态。在3.20 GHz机器和集群计算设备上分别对简化版、全A5/1密码进行了实验。
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引用次数: 1
Beam and Channel Tracking for 5G Communication Systems Using Adaptive Filtering Techniques: A Comparison Study 采用自适应滤波技术的5G通信系统波束和信道跟踪:比较研究
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2021-0117
Mohanad Al-Ibadi, Farhad E. Mahmood
—In this paper, we study the problem of beam track- ing of a multipath channel in millimeter-wave massive MIMO communication system using adaptive filters. We focus on the performance of least-mean-square filter (LMS) and recursive least-squares filter (RLS) algorithms, compared to a reference extended Kalman filter (EKF), in scenarios where the wireless channel is dominated by a single line of sight (LOS) path or a small number of strong paths. The signal direction and channel coefficients are tracked and updated using these filters. Our results recommend that beamforming systems at millimeter-wave bands should consider variable number of paths rather than a single dominant LOS path. Furthermore, we show that the mean squared-error (MSE) of the innovation process gives a better overall view of the tracking performance than the MSE of the state parameters.
本文研究了毫米波大规模MIMO通信系统中采用自适应滤波器的多径信道波束跟踪问题。我们重点研究了最小均方滤波器(LMS)和递归最小二乘滤波器(RLS)算法的性能,与参考扩展卡尔曼滤波器(EKF)相比,在无线信道由单线视距(LOS)路径或少量强路径主导的情况下。使用这些滤波器跟踪和更新信号方向和信道系数。我们的研究结果建议毫米波波段的波束形成系统应该考虑可变数量的路径,而不是单一的主要LOS路径。此外,我们发现创新过程的均方误差(MSE)比状态参数的均方误差(MSE)更能全面地反映跟踪性能。
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引用次数: 0
Dynamic Trust-Based Device Legitimacy Assessment Towards Secure IoT Interactions 面向安全物联网交互的动态基于信任的设备合法性评估
IF 0.7 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.24138/jcomss-2021-0189
Vishwanath G. Garagad, N. Iyer
—Establishing trust-based interactions in heteroge- neously connected devices appears to be the prominent mechanism in addressing the prevailing concerns of confidence, re- liability and privacy relevant in establishing secure interactions among connected devices in the network. Trust-based assessment of device legitimacy is evolving given IoT devices’ dynamic and heterogeneous nature and emerging adversaries. However, computation and application of trust level in establishing secure communications, access control and privacy domain are rarely discussed in the literature. To compute trust, based on the quality of service, direct interactions, and the relationship between devices, we introduce a multi-factor trust computation model that considers the multiple attributes of interactions in an IoT network of heterogeneous devices providing a wide range of data and services. Direct trust is estimated for quality of service considering the response time, reliability, consistency, and integrity attributes of devices. The time decay factor influences the credibility of computed trust over time. The policy-driven mechanism is employed to sift the devices and isolate the mali- cious ones. Extensive simulations validate the proposed model’s effectiveness using Contiki’s Cooja simulator for IoT networks.
-在异构连接设备中建立基于信任的交互似乎是解决普遍存在的信任、责任和隐私问题的重要机制,这些问题与在网络中连接设备之间建立安全交互有关。鉴于物联网设备的动态和异构性质以及新兴对手,基于信任的设备合法性评估正在不断发展。然而,文献中很少讨论信任等级在建立安全通信、访问控制和隐私域等方面的计算和应用。为了计算信任,基于服务质量、直接交互和设备之间的关系,我们引入了一个多因素信任计算模型,该模型考虑了提供广泛数据和服务的异构设备组成的物联网网络中交互的多个属性。直接信任是根据设备的响应时间、可靠性、一致性和完整性等属性来估计服务质量的。随着时间的推移,时间衰减因素会影响计算信任的可信度。采用策略驱动机制对设备进行筛选,对恶意设备进行隔离。广泛的仿真验证了所提出模型的有效性,使用Contiki的Cooja模拟器用于物联网网络。
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引用次数: 1
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