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文章提出了运用软件无线电、有线及无线高速网络、云计算等技术等3项新技术相结合的全新的无线电监测系统的设想、框架及应用模式,一改传统无线电监测基础思想和模式,为新一代的无线电监管技术及体系的发展提供参考。 相似文献
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软件无线电接收机简介及浅析 总被引:1,自引:0,他引:1
本文介绍了理想软件无线电,中频数字化,超外差及零中频这四种目前主要的软件无线电接刷机结构,并简要分析了这些结构的特点,本文还对零中频接收机的直流漂移问题及其解决方案进行了分析。 相似文献
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Wireless Personal Communications - Wireless systems using low-power wireless communication protocol are rapidly gain popularity in the license-free industrial scientific, and medical (ISM)... 相似文献
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We present, BSense, a flexible broadband mapping system for broadband coverage and quality assessment of broadband connections in a given geographic region. For coverage related analysis, it relies on data that is either obtained from ISPs or generated based on technology models and information about infrastructure sites. Broadband quality assessment in BSense is via host-based measurements using our multi-platform and technology-adaptive software client which periodically runs as a background process on users’ computers. The host-based software measurement approach employed in BSense is not only cost-effective but is also flexible and reduces measurement bias. BSense also incorporates a flexible broadband quality index for summarizing the collective effect of various underlying attributes such as download/upload speeds and latency. BSense system has been implemented based on open-source software components. We conduct extensive evaluations of the measurement component of BSense aimed at quantifying system effects and to compare against other measurement techniques and approaches, the latter showing that BSense is fairly close to sophisticated and expensive alternatives. The usefulness of the BSense system is demonstrated using two real world case studies, one on identifying notspots in Scotland and the other on broadband quality assessment in a rural part of Scotland through pilot deployment. 相似文献
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针对科技项目管理系统重复开发问题,运用领域分析方法和开源框架技术,研究设计一个可扩展、可配置、松耦合的轻量级Web快速开发框架。系统管理员通过Web控制台可以简单快速地对项目管理过程、内容、模板、用户及权限等进行个性化配置。实际应用表明,基于该框架可以快速配置生成满足用户个性化需求的科技项目管理系统,有效解决项目管理系统重复开发和不规范等问题。 相似文献
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Analogue baseband filters are an important circuit for channel select and anti-aliasing in wireless and mobile communication
systems. For software and cognitive radio, they must be widely tunable and reconfigurable to accommodate existing, emerging,
and future wireless and mobile standards. In this paper, design considerations of tunable and programmable filters for highly
integrated multistandard receivers are presented. General background of multistandard integrated receivers and design challenges
of analogue baseband filters are given. Circuit techniques for baseband filter design including the widely used active-RC
and Gm-C circuits are described. Filter structures and design methods for high-order baseband filters are reviewed. On-chip
tuning issues and methods are discussed. Results and performances of some published design examples are summarized. Future
directions are also pointed out. 相似文献
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软件定义网络是继云计算、移动互联网、大数据之后,信息通信领域又一热议的对象,被称作下一次网络革命,对下一代互联网发展有着重要的影响。首先介绍了软件定义网络的发展背景、原理、架构与内涵,然后阐述了SDN的关键技术,最后分析了SDN的优缺点及应用领域。 相似文献
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Luguang Wang Fei Song Gui Fang Zhibin Feng Wen Li Yifan Xu Chen Pan Xiaojing Chu 《中国通信》2022,(10):38-54
In multi-agent confrontation scenarios, a jammer is constrained by the single limited performance and inefficiency of practical application. To cope with these issues, this paper aims to investigate the multi-agent jamming problem in a multi-user scenario, where the coordination between the jammers is considered. Firstly, a multi-agent Markov decision process(MDP) framework is used to model and analyze the multi-agent jamming problem. Secondly, a collaborative multi-agent jamming algorithm(CMJA)... 相似文献
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首先介绍工装快速准备问题提出的工程背景,在分析工装快速准备迫切性的基础上对工装快速准备的关键技术(如工装资源动态建模技术、模块化设计以及工装全生命周期管理等)进行分析和探讨,最后以国内某航空发动机企业乡例,介绍快速扩散制造环境下工装快速准备系统的工作流程及应用体系。 相似文献
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认知无线电技术的研究及发展 总被引:1,自引:1,他引:0
认知无线电技术作为软件无线电技术的一个特殊扩展,受到日益广泛的关注.由于该技术能够自动检测无线电环境,调整传输参数,从空间、时间、频率、调制方式等多维度共享无线频谱,可以大幅度提高频谱利用效率.本文首先从认知无线电技术的定义入手,分别讨论了认知无线电的基本概念、功能与实现、标准化的进程.然后介绍了当前应用状况,最后分析了未来的发展及面临的挑战. 相似文献
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本文在总结国内广播网站的历史沿革、发展现状的基础上,进一步联系北京人民广播电台视听业务的发展现状,探索媒介融合环境下广播网站视听业务的实现方式与传播策略,目的在于顺应三网融合的趋势,推动广播的进一步创新,促进新媒体与传统媒体全面协调可持续发展。 相似文献
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恐怖事件、暴动事件、突发事件等社会事件对国家安全造成了极大的威胁,也给社会治理带来了新的挑战。事件库通过记录社会现实事件,能够在态势感知、风险预警、应急响应等社会安全应用中发挥重要作用。构建全球事件库的两个开创性项目ICEWS和GDELT最近获得了广泛关注,文中对这两个全球事件库进行了系统的分析、对比和评估,以期为事件库构建、事件抽取和事件图谱等领域提供帮助和参考。 相似文献
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信息产业部电信研究院 《现代电信科技》2007,37(7):1-6
互联网是人类20世纪最伟大的基础性科技发明之一。作为信息传播的新载体、科技创新的新手段,互联网的普及和发展改变了人类的生活和生产方式,引发了前所未有的信息革命和产业革命,也必将进一步引发深刻的社会变革。[第一段] 相似文献