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Universal Software Radio Peripheral/GNU Radio-Based Implementation of a Software-Defined Radio Communication System 通用软件无线电外设/基于GNU无线电的软件定义无线电通信系统实现
E. Sheybani
Challenges involved in space communications across wireless channels call for new approaches to radio systems. Due to the growing need for frequency change in modern wireless systems, an adaptive radio system has the highest demand. Software-defined radios (SDR) offer this type of adaptivity as well as compatibility with other standard platforms such as USRP/GNU radio. Despite limitations of this approach due to hardware components, viable modeling and simulation as well as deployable systems are possible using this platform. This chapter presents a detailed implementation procedure for a USRP/GNU radio-based SDR communication system that can be used for practical experiments as well as an academic lab in this field. In this experiment the USRP has been configured to receive signal from a local radio station using the BasicRX model daughterboard. The programmable USRP executes Python block code implemented in the GNU Radio Companion (GRC) on Ubuntu OS.
跨无线信道空间通信所面临的挑战要求采用无线电系统的新方法。由于现代无线系统对频率变化的需求日益增长,对自适应无线电系统的要求最高。软件定义无线电(SDR)提供这种类型的适应性以及与其他标准平台(如USRP/GNU无线电)的兼容性。尽管这种方法由于硬件组件的限制,但可行的建模和仿真以及可部署的系统都可以使用该平台。本章给出了一个基于USRP/GNU无线电的SDR通信系统的详细实现过程,该系统既可用于实际实验,也可用于该领域的学术实验室。在本实验中,USRP已配置为使用BasicRX模型子板接收来自本地无线电台的信号。可编程的USRP执行在Ubuntu OS上的GNU Radio Companion (GRC)中实现的Python块代码。
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引用次数: 0
Internet of Things and Big Data-Driven Data Analysis Services for Third Parties 第三方物联网和大数据驱动的数据分析服务
I. Lokshina, Barbara J. Durkin, C. Lanting
Ubiquitous sensing devices, enabled by wireless sensor network (WSN) technologies, cut across every area of modern day living, affecting individuals and businesses and offering the ability to measure and understand environmental indicators. The proliferation of these devices in a communicating-actuating network creates the internet of things (IoT). The IoT provides the tools to establish a major global data-driven ecosystem with its emphasis on big data. Now business models may focus on the provision of services (i.e., the internet of services [IoS]). These models assume the presence and development of the necessary IoT measurement and control instruments, communications infrastructure, and easy access to the data collected and information generated. Different business models may support creating revenue and value for different types of customers. This chapter contributes to the literature by considering, for the first time, knowledge-based management practices, business models, new ventures, and new business opportunities for third-party data analysis services.
由无线传感器网络(WSN)技术支持的无处不在的传感设备遍及现代生活的各个领域,影响着个人和企业,并提供了测量和理解环境指标的能力。这些设备在通信驱动网络中的扩散创造了物联网(IoT)。物联网为建立以大数据为重点的全球主要数据驱动生态系统提供了工具。现在,商业模式可能专注于提供服务(即服务互联网[IoS])。这些模型假设存在和开发必要的物联网测量和控制仪器,通信基础设施,以及易于访问收集的数据和生成的信息。不同的商业模式可能支持为不同类型的客户创造收入和价值。本章通过首次考虑以知识为基础的管理实践、商业模式、新的风险投资和第三方数据分析服务的新商业机会,为文献做出了贡献。
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引用次数: 3
Brand Management and Media Gatekeeping 品牌管理和媒体把关
Georgia-Zozeta Miliopoulou, V. Cossiavelou
This chapter examines the brand manager's point of view on content marketing and brand management in the social media. Using the filters of media gatekeeping, the authors study Greek executives' views and practices in local and multinational firms and agencies. Findings indicate that gatekeeping still prevails. The dipole between control and security on the one hand, and openness and dialog on the other, determines all decision-making processes. A standardization of practices is observed, especially around brand communities and content publishing, as well as a need for control and risk avoidance. Global brands rely on headquarter-provided content requesting approvals for any modification. Local brands tend to outsource and monitor content calendars. Most brands consider what to release rather than what not to. They maintain a narrow, campaign-oriented mindset that reflects traditional practices and have not embraced the requirements for transparency and openness that prevail in the social media environment.
本章探讨了品牌经理对社交媒体内容营销和品牌管理的观点。利用媒体把关的过滤器,作者研究了希腊高管在当地和跨国公司和机构中的观点和做法。调查结果表明,守门人仍然盛行。一方面是控制和安全,另一方面是开放和对话,这两者之间的偶极子决定了所有决策过程。我们观察到实践的标准化,特别是围绕品牌社区和内容发布,以及控制和风险规避的需求。全球品牌依赖总部提供的内容,任何修改都需要获得批准。本地品牌倾向于外包和监控内容日历。大多数品牌考虑的是发布什么,而不是不发布什么。他们保持着一种狭隘的、以运动为导向的思维方式,反映了传统的做法,没有接受社交媒体环境中普遍存在的透明和开放的要求。
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引用次数: 0
Centrality Metrics-Based Connected Dominating Sets for Real-World Network Graphs 基于中心性度量的真实网络图连通支配集
N. Meghanathan, Atiqur Rahman, Mahzabin Akhter
The authors investigate the use of centrality metrics as node weights to determine connected dominating sets (CDS) for a suite of 60 real-world network graphs of diverse degree distribution. They employ centrality metrics that are neighborhood-based (degree centrality [DEG] and eigenvector centrality [EVC]), shortest path-based (betweenness centrality [BWC] and closeness centrality [CLC]) as well as the local clustering coefficient complement-based degree centrality metric (LCC'DC), which is a hybrid of the neighborhood and shortest path-based categories. The authors target for minimum CDS node size (number of nodes constituting the CDS). Though both the BWC and CLC are shortest path-based centrality metrics, they observe the BWC-based CDSs to be of the smallest node size for about 60% of the real-world networks and the CLC-based CDSs to be of the largest node size for more than 40% of the real-world networks. The authors observe the computationally light LCC'DC-based CDS node size to be the same as the computationally heavy BWC-based CDS node size for about 50% of the real-world networks.
作者研究了使用中心性度量作为节点权重来确定60个不同程度分布的真实网络图的连接支配集(CDS)。他们采用了基于邻域(度中心性[DEG]和特征向量中心性[EVC])、基于最短路径(中间性中心性[BWC]和接近性中心性[CLC])以及基于局部聚类系数互补的度中心性度量(LCC'DC)的中心性度量,它是基于邻域和基于最短路径类别的混合。作者的目标是最小CDS节点大小(构成CDS的节点数量)。尽管BWC和CLC都是基于最短路径的中心性指标,但他们观察到,在大约60%的真实网络中,基于BWC的cds具有最小的节点大小,而在超过40%的真实网络中,基于CLC的cds具有最大的节点大小。作者观察到,在50%的真实网络中,基于LCC' dc的计算轻量级CDS节点大小与基于bwc的计算重型CDS节点大小相同。
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引用次数: 0
Hyperspectral Microwave Atmospheric Sounder (HyMAS) Graphical User Interface Design 高光谱微波大气探测器(HyMAS)图形用户界面设计
G. Javidi
The hyperspectral microwave atmospheric sounder (HyMAS), for weather and climate missions, is capable of all-weather sounding equivalent to hyperspectral infrared sounders (in which clouds decrease the accuracy of the results) in clear air with vertical resolution of approximately 1 km. This will improve both the vertical and horizontal resolutions of the atmosphere. Through the use of independent RF antennas that sample the volume of the Earth's atmosphere through various levels of frequencies, thereby producing a set of dense, spaced vertical weighting functions, hyperspectral microwave is achieved. This yields surface precipitation rate and water path retrievals for small hail, soft hail, or snow pellets, snow, rainwater, etc. with high accuracies. One of HyMAS requirements is a graphical user interface (GUI). Hyperspectral measurements allow the user to determine the Earth's temperature with vertical resolution exceeding 1km (1093.61 yards).
用于天气和气候任务的高光谱微波大气探测仪(HyMAS)能够在晴朗的空气中进行相当于高光谱红外探测仪的全天候探测(在这种情况下,云层会降低结果的精度),垂直分辨率约为1公里。这将提高大气的垂直和水平分辨率。通过使用独立的射频天线,通过不同的频率水平对地球大气的体积进行采样,从而产生一组密集的、间隔的垂直加权函数,实现了高光谱微波。这产生地表降水率和水路径检索小冰雹,软冰雹,或雪球,雪,雨水等具有高精度。HyMAS的需求之一是图形用户界面(GUI)。高光谱测量允许用户以超过1公里(1093.61码)的垂直分辨率确定地球的温度。
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引用次数: 1
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Strategic Innovations and Interdisciplinary Perspectives in Telecommunications and Networking
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