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2019 28th Wireless and Optical Communications Conference (WOCC)最新文献

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Latency-Aware Resource-Efficient Virtual Network Embedding in Software Defined Networking 软件定义网络中延迟感知的资源高效虚拟网络嵌入
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770635
Zihui Yan, Ning Wei, Qizhen Jin, Xiaobo Zhou
Software defined networking (SDN) is a key technology in building future generation networks by decoupling the control and data plane. By allowing multiple virtual networks (VN) to coexist in the same underlying SDN, virtual software defined networking (vSDN) can further improve the resource utilization and satisfy the diverse quality of service (QoS) requirements of users. Different from traditional VN embedding, there are more types of resources need to be allocated in vSDN. In addition, the control plane latency impacts on the performance of vSDN, especially when control flow and data flow share the same substrate links. Therefore, a key problem is minimizing the control latency while maintaining load balance. In this paper, we propose a heuristic latency-aware resource-efficient algorithm to solve it, after formulating the vSDN embedding problem as the integer linear programming model. In our method, we first aggregate the candidate physical nodes having similar resources proportion with the virtual node based on K-Means clustering. Then, the optimal physical node is selected out from the cluster according to the control latency derived from network calculus. Finally, the K-shortest path algorithm executes to map virtual links to the substrate paths between the corresponding substrate node. Simulation results demonstrate that the proposed algorithm improves the vSDN acceptance ratio by around 20% than an existing greedy algorithm with the controller-to-switch latency guarantee.
软件定义网络(SDN)是实现控制平面和数据平面解耦,构建下一代网络的关键技术。虚拟软件定义网络(vSDN)通过允许多个虚拟网络(VN)在同一个底层SDN中共存,可以进一步提高资源利用率,满足用户对服务质量(QoS)的多样化需求。与传统的虚拟网络嵌入不同,在vSDN中需要分配的资源类型更多。此外,控制平面时延也会影响vSDN的性能,特别是当控制流和数据流共用同一基片链路时。因此,一个关键问题是在保持负载平衡的同时最小化控制延迟。本文在将vSDN嵌入问题表述为整数线性规划模型的基础上,提出了一种启发式延迟感知资源高效算法来解决该问题。在我们的方法中,我们首先基于K-Means聚类对与虚拟节点具有相似资源比例的候选物理节点进行聚合。然后,根据网络演算得到的控制延迟从集群中选择最优物理节点。最后,执行k最短路径算法,将虚拟链路映射到相应基板节点之间的基板路径。仿真结果表明,该算法比现有贪心算法提高了约20%的vSDN接受率,并保证了控制器到交换机的延迟。
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引用次数: 5
Price-based Power Allocation for Multi-UAV Enabled Wireless Networks 基于价格的多无人机无线网络功率分配
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770581
Xiaomin Liu, Lixin Li, Fucheng Yang, Xu Li, Wei Chen, Wenjun Xu
In this paper, we study the problem of downlink power allocation in the multi-UAV enabled wireless networks, where the unmanned aerial vehicles (UAVs) act as the aerial base stations (BSs) to serve a group of users on the ground. To solve the problem, we propose a price-based optimal power allocation scheme, and model the interaction between the UAVs and the ground users as a Stackelberg game. As the leaders of the game, the UAVs choose the optimal power price to maximize their own revenue. Each ground user of the networks selects optimal power strategy to maximize its own utility. In order to solve the equilibrium program with equilibrium constraints (EPEC) problem of the Stackelberg game, we investigate the lower equilibrium of the ground users, and propose a distributed iterative algorithm to obtain the equilibrium of the lower game. Simulation results show that through the price-based optimal power allocation scheme, the capacity of the BSs and the rates of users are improved.
本文研究了多无人机无线网络中,无人机作为空中基站为地面用户服务的下行链路功率分配问题。为了解决这一问题,我们提出了一种基于价格的最优功率分配方案,并将无人机与地面用户之间的交互建模为Stackelberg博弈。作为游戏的领导者,无人机选择最优的电价来最大化自己的收益。网络的每个地面用户选择最优的功率策略,使自己的效用最大化。为了解决具有均衡约束的均衡规划(EPEC)问题,研究了地面用户的下均衡,提出了一种求解下均衡的分布式迭代算法。仿真结果表明,通过基于价格的最优功率分配方案,可以提高基站的容量和用户的利用率。
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引用次数: 12
CP Optimization for Multi-numerologies F-OFDM in MIMO System MIMO系统中多数字F-OFDM的CP优化
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770665
Meijie Yang, Yueyun Chen, Yuan Liu, Liping Du, Zushen Liu
Filtered-orthogonal frequency division multiplexing (F-OFDM) is a potential waveform which uses sub-band filtering to support multi-numerologies in the future 5G systems. It is a future trend to combine F-OFDM with MIMO to further improve the system capacity. However, when employing different numerologies, a long filter length is needed to suppress severe inter-user interference (IUI) caused by various symbol duration in time domain, which causes inter-symbol interference (ISI) and inter-carrier interference (ICI) at the same time. Longer CP is helpful to resist the effect of multipath and filter responds but will waste more time resource. In order to reduce ISI and ICI while improving the spectrum efficiency, we propose a CP optimization model based on theoretical derivation of ISI, ICI and IUI for downlink MIMO F-OFDM system. The simulation results show that the ISI and ICI decrease as CP gets longer, while the spectrum efficiency is improved based on the proposed CP optimization model and outperforms traditional OFDM.
滤波正交频分复用(F-OFDM)是一种潜在的波形,它使用子带滤波来支持未来5G系统中的多数字技术。将F-OFDM与MIMO相结合,进一步提高系统容量是未来的发展趋势。然而,当采用不同的数字时,需要较长的滤波器长度来抑制由不同符号持续时间在时域上引起的严重的用户间干扰(IUI),这种干扰会同时引起符号间干扰(ISI)和载波间干扰(ICI)。较长的CP有助于抵抗多径和滤波器响应的影响,但会浪费更多的时间资源。为了在降低ISI和ICI的同时提高频谱效率,提出了一种基于ISI、ICI和IUI理论推导的下行MIMO F-OFDM系统CP优化模型。仿真结果表明,随着CP长度的增加,ISI和ICI减小,频谱效率提高,优于传统的OFDM。
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引用次数: 2
Design and implementation of intelligent walking stick based on OneNET Internet of things development platform 基于OneNET物联网开发平台的智能手杖的设计与实现
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770547
Bo Wang, Wei Xiang, Kairen Ma, Y. Mu, Zheng Wu
In view of the fact that most of the crutches on the market have a single function, they are not convenient for the elderly and blind people to go out and very expensive. In this design, the gyroscope accelerometer module, ultrasonic module, SIM868 module, voice module and so on are controlled by STM32F103 microcontroller, which realizes the detection of obstacles ahead, crutches quickly drop the ground alarm, crutch voice prompt and other basic functions. The APP of mobile phone with hardware is written to the family of crutches, which can update the user's position, security and other information in real time. Therefore, the design not only realizes many key functions, but also increases the exchange of information between users and their families, making it more secure for users to go out alone and the families more assured.
鉴于市面上的拐杖大多功能单一,老年人和盲人外出不方便,而且价格非常昂贵。在本设计中,陀螺仪加速度计模块、超声波模块、SIM868模块、语音模块等由STM32F103单片机控制,实现了前方障碍物检测、拐杖快速落地报警、拐杖语音提示等基本功能。带硬件的手机APP写入拐杖家族,可以实时更新用户的位置、安全等信息。因此,本设计不仅实现了许多关键功能,而且增加了用户与家人之间的信息交流,让用户独自外出更安全,让家人更放心。
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引用次数: 1
Virtual Force-Decorated Genetic Algorithm to Optimize Base Station Locations 虚拟力装饰遗传算法优化基站位置
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770642
Huan Wang, W. Huangfu, Yunhui Qin, Keping Long
The base station location optimization is one of the most important issues in cellular networks. A novel genetic algorithm combined with the virtual force decoration to improve coverage performance of cellular networks is proposed. The virtual force decoration modifies the individuals and provides a better direction guide for the gene mutation. Experiences prove the proposed algorithm not only obtains higher coverage rate but also converges faster than the standard genetic algorithms.
基站位置优化是蜂窝网络中最重要的问题之一。提出了一种结合虚拟力装饰的遗传算法来提高蜂窝网络的覆盖性能。虚力修饰修饰了个体,为基因突变提供了更好的方向指导。实践证明,该算法不仅具有较高的覆盖率,而且收敛速度快于标准遗传算法。
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引用次数: 1
A Neighbor Discovery Algorithm for Flying Ad Hoc Network Using Directional Antennas 一种基于定向天线的飞行Ad Hoc网络邻居发现算法
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770698
Lingjun Liu, Laixian Peng, Renhui Xu, Wendong Zhao
In this paper, we consider the neighbor discovery problem in Flying Ad Hoc Network using directional antennas. Based on realistic scenarios, the height of UAVs can be approximated to follow a Gaussian distribution. A novel 2-way neighbor discovery algorithm that adjusts the selection probability according to transmission space divided by pitch angle parameter is proposed. Then we derive analytical expressions of the probability of a successful discovery between two nodes and the expected value of time slots needed to complete the neighbor discovery. We also adopt a practical way to determine when to terminate the discovery procedure. Lastly, simulation results are presented to show the effectiveness of proposed algorithm.
本文研究了定向天线飞行Ad Hoc网络中的邻居发现问题。根据实际情况,无人机的高度可以近似地服从高斯分布。提出了一种根据传输空间除以俯仰角参数来调整选择概率的双向邻居发现算法。然后推导出两个节点之间成功发现的概率和完成邻居发现所需的时隙期望值的解析表达式。我们还采用了一种实用的方法来确定何时终止发现过程。最后给出了仿真结果,验证了算法的有效性。
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引用次数: 0
Dynamic Tasks Assignment for Face Recognition in Edge Computing 边缘计算中人脸识别的动态任务分配
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770651
Yawei Song, Yunfeng Peng, Liang Zhang
Face recognition has been widely used in airport security, face payment, access control, and other scenarios. Face recognition contains a sequence of tasks, e.g. face detection, preprocessing, feature extraction and classification recognition. This paper focuses on the dynamic tasks assignment for face recognition in edge computing architecture. Our preliminary experimental results show that different ways of assigning tasks can significantly affect the response time of face recognition services. Motivated by this finding, we propose a new framework for face recognition in edge computing architecture which supports the face recognition tasks assignment to Edge server and Cloud server. We further propose a dynamic tasks allocation algorithm based on decision tree that minimizes the overall response time for face recognition. Simulation results indicate that the average response time of our scheme is 62.5%, 34.7%, and 17.4% lower than that of a simple model, cloud model, and fog computing (FC) model respectively.
人脸识别已广泛应用于机场安检、人脸支付、门禁等场景。人脸识别包含一系列的任务,如人脸检测、预处理、特征提取和分类识别。研究了边缘计算架构下人脸识别的动态任务分配问题。我们的初步实验结果表明,不同的任务分配方式会显著影响人脸识别服务的响应时间。基于这一发现,我们提出了一种新的边缘计算架构中的人脸识别框架,该框架支持将人脸识别任务分配给边缘服务器和云服务器。我们进一步提出了一种基于决策树的动态任务分配算法,使人脸识别的总体响应时间最小化。仿真结果表明,该方案的平均响应时间分别比简单模型、云模型和雾计算(FC)模型低62.5%、34.7%和17.4%。
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引用次数: 1
Satellite communication on the non-geostationary system and the geostationary system in the Fixed-satellite service 卫星通信上有非地球静止系统和地球静止系统中的固定卫星业务
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770693
Jianxin Li, Meng Li, Wei Li
This paper focused on satellite communication on compatibility study between non-geostationary system and the geostationary system in the fixed-satellite service. Nowadays, both geostationary and non-geostationary fixed-satellite service satellite systems may operate in the frequency bands 37.5-39.5 GHz (space-to-Earth), 39.5-42.5 GHz (space-to-Earth), 47.2-50.2 GHz (Earth-to-space) and 50.4-51.4 GHz (Earth-to-space). However, there is currently no protection standard shared by the two systems in the Q/V frequency bands. This study uses the representative Low Earth orbit satellite to calculate the interference of two systems. In order to evaluate the level of interference, this paper specially selects the medium-sized satellite constellation with 336 satellites to calculate the aggregate interference level. Study used two tracking communication strategies, the maximum antenna Gain identification and the best elevation angle, to choose related satellite for considering different levels of interference. Paper calculated and analysed the compatible application of geostationary and non-geostationary fixed-satellite service system, and obtained preliminary compatibility and sharing conditions.
本文以卫星通信为研究对象,对卫星固定业务中非静止系统与静止系统的兼容性进行了研究。目前,地球静止卫星和非地球静止卫星固定业务卫星系统都可以在37.5-39.5 GHz(空对地)、39.5-42.5 GHz(空对地)、47.2-50.2 GHz(地对空间)和50.4-51.4 GHz(地对空间)频段工作。然而,在Q/V频段,目前没有两个系统共享的保护标准。本文利用具有代表性的近地轨道卫星,对两种系统的干扰进行了计算。为了评估干扰水平,本文特别选取了336颗卫星的中型卫星星座计算总干扰水平。研究采用最大天线增益识别和最佳仰角两种跟踪通信策略,针对不同程度的干扰选择相关卫星。对静止与非静止固定卫星业务系统的兼容应用进行了计算和分析,得到了初步的兼容和共享条件。
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引用次数: 4
Transmitter Design and Synchronization Concepts for DaViD Display Camera Communication DaViD显示摄像机通信发射机设计与同步概念
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770659
Jianshuang Xu, J. Klein, Christian Brauers, R. Kays
Visible Light Communication is a promising technology for data transmission, which has become more and more relevant in recent years. Other than the common approach of modulated LED lighting, display-camera communication has become an attractive novel take on the concept. As outlined in earlier papers, the DaViD (Data Transmission Using Video Displays) system provides a modulation concept allowing for a data overlay onto video content which is nearly invisible to the viewer, i.e. causing hardly any perceptible degradation in video quality. This is achieved by differentially modulating the chrominance information of the underlying video frames with low amplitudes. The resulting color differences within the recorded images can be interpreted by the receiver, allowing for reconstruction of the transmitted data. In this paper, we introduce further system details and improvements to the DaViD concept. In addition to traditional transmission systems, on the display-camera link, the receiver has to be not only temporally but also spatially synchronized to the transmitter. We address the spatial synchronization problem by utilizing localization patterns for detecting the modulation area and a separate optimization on columns and rows for data resampling. Using a slight temporal oversampling, clean data frames can be reconstructed on the receiver side. Based on our modulation and coding concept, we achieve a data rate up to 34.56 Mbit/s in our current demonstration setup with hardly any visible degradation in video quality.
可见光通信是一种很有前途的数据传输技术,近年来受到越来越多的关注。除了调制LED照明的常见方法外,显示器-摄像机通信已经成为一种有吸引力的新概念。正如在早期的论文中概述的那样,DaViD(使用视频显示的数据传输)系统提供了一个调制概念,允许数据覆盖到视频内容上,这对观看者来说几乎是不可见的,也就是说,几乎不会引起视频质量的任何可察觉的下降。这是通过差分调制具有低幅度的底层视频帧的色度信息来实现的。在记录的图像中产生的色差可以由接收器解释,允许传输数据的重建。在本文中,我们进一步介绍了DaViD概念的系统细节和改进。除了传统的传输系统外,在显示-摄像机链路上,接收器不仅要在时间上而且要在空间上与发射器同步。我们通过利用定位模式来检测调制区域和对数据重采样的列和行进行单独优化来解决空间同步问题。使用轻微的时间过采样,可以在接收端重建干净的数据帧。基于我们的调制和编码概念,我们在目前的演示设置中实现了高达34.56 Mbit/s的数据速率,视频质量几乎没有任何明显的下降。
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引用次数: 5
Hybrid Self-Organization based Cluster Management Scheme for Group Mobility Aware MANET 基于混合自组织的群体移动感知MANET集群管理方案
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770680
F. Aftab, Zhongshan Zhang
The dynamic changes in cluster topology of Mobile Ad-hoc Network (MANET) can cause cluster management issues. Cluster management in the presence of mobility and cluster load balancing are among the most difficult issues to handle in mobility aware MANET. In this paper, we propose a self-organization based hybrid scheme for cluster management. This scheme is inspired from the behavioral study of firefly and dragonfly. Hybrid scheme consists of different phases which ensure cluster formation and its management. The cluster formation takes place by using energy aware approach of firefly algorithm while cluster management takes place using behavioral study of both dragonfly and firefly. A cluster merging technique is proposed for refining number of clusters in MANET to achieve cluster load balancing. The performance of proposed hybrid scheme is evaluated and compared with the existing scheme by considering the benchmarks of energy consumption, cluster head advertisement messages and topology distribution with respect to hop count.
移动自组织网络(MANET)集群拓扑结构的动态变化会引起集群管理问题。移动性下的集群管理和集群负载平衡是移动性感知MANET中最难处理的问题之一。本文提出了一种基于自组织的混合集群管理方案。这个方案的灵感来自萤火虫和蜻蜓的行为研究。混合方案由不同阶段组成,保证了集群的形成和管理。利用萤火虫算法的能量感知方法进行集群形成,同时利用蜻蜓和萤火虫的行为研究进行集群管理。提出了一种聚类合并技术,通过优化簇数实现集群负载均衡。通过考虑能耗、簇头通告消息和相对跳数的拓扑分布等基准,对所提出的混合方案的性能进行了评价,并与现有方案进行了比较。
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引用次数: 3
期刊
2019 28th Wireless and Optical Communications Conference (WOCC)
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