共查询到16条相似文献,搜索用时 109 毫秒
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分析了认知无线电网络的集中式、Ad Hoc式和Mesh式体系架构及其节点与链路特性.在认知无线电终端方面,分析了系统组成,并阐述了其认知引擎中环境感知模块、方案制定与优化模块、知识库、知识进化器和接口模块的功能定义以及认知循环过程.最后,论述了认知无线电的频谱感知、频谱分配以及功率控制关键技术. 相似文献
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从软件无线电到认知无线电,走向终极无线电——无线通信发展展望 总被引:6,自引:0,他引:6
杨小牛 《中国电子科学研究院学报》2008,3(1):1-7
介绍软件无线电三种基本结构及认知无线电基本概念的基础上,提出了基于电子侦察原理的一种新的认知无线电实现架构及其对应的认知循环过程.同时,针对认知无线电存在的问题,提出了基于盲源分离的认知无线电--终极无线电(ultimate radio)的新概念,并对其实现的可行性进行了初步的分析讨论. 相似文献
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认知无线电作为一种智能无线电技术,可赋予无线通信系统以电磁环境感知能力,有效解决频谱利用率和管理的问题.软件通信体系结构(简称SCA)已被软件无线电论坛采纳为嵌入式系统的标准通信软件结构.SCA提供了一种支持通信软件和硬件可移植、可配置、可扩充和可重用的软件平台.本文首先论述了认知无线电的概念、功能,接着结合开源认知无线电的概念,提出了一种基于SCA的认知无线电台的新结构,并进行了详细的阐述. 相似文献
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O. León J. Hernández‐Serrano M. Soriano 《International Journal of Communication Systems》2010,23(5):633-652
Cognitive radio is a promising technology aiming to improve the utilization of the radio electromagnetic spectrum. A cognitive radio device uses general purpose computer processors that run radio applications software to perform signal processing. The use of this software enables the device to sense and understand its environment and actively change its mode of operation based on its observations. Unfortunately, this solution entails new security challenges. Our objective in this paper is to analyze the security issues of the main recent developments and architectures of cognitive radio networks. We present vulnerabilities inherent to those systems, identify novel types of abuse, classify attacks, and analyze their impact on the operation of cognitive radio‐based systems. Moreover, we discuss and propose security solutions to mitigate such threats. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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Kwang‐Cheng Chen Peng‐Yu Chen Neeli Prasad Ying‐Chang Liang Sumei Sun 《Wireless Communications and Mobile Computing》2010,10(4):467-485
Networking cognitive radios and nodes from primary system (PS) results in a heterogeneous coexisting multi‐radio wireless network, so that significant network throughput gain can be achieved. However, by investigating cognitive radio network (CRN) architecture, the links in CRNs are unlikely to support complete security check due to link dynamics, opportunistic availability, and uni‐directional in available time window. We therefore introduce trusted cognitive radio networking (TCRN) concept to facilitate network functions such as association in dynamic spectrum access and routing. First of all, we explore the mathematical framework for trust in CRNs. We then show successful association of node to CRN based on the mathematical structure of trust from statistical decision theory. Furthermore, we modify the machine‐learning algorithm to update the trust measure for each node, and develop rules of thumbs to facilitate TCRN with learning capability, based on numerical simulations. Trusted CRN can greatly alleviate heterogeneous challenge for CRN operation. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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从软件无线电到认知无线电的无线通信发展现状 总被引:1,自引:0,他引:1
本文归纳了从软件无线电到认知无线电功能的演进。认知无线电又是在软件无线电的基础上提出的智能化的无线通信技术,它着力解决频谱资源的有效利用问题:认知无线电概念的提出将对现行的频谱管理体制提出挑战,并给无线通信带来新的发展空间。在此基础上探讨了认知无线电技术未来发展值得关注的热点问题。 相似文献