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arXiv 0905.3023cs.ITmath.IT
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阴影环境下认知无线电系统的干扰和部署问题

Interference and Deployment Issues for Cognitive Radio Systems in Shadowing Environments

Muhammad Fainan Hanif, Mansoor Shafi, Peter J. Smith, Pawel A. Dmochowski

摘要:

在本文中,我们描述了一个模型,用于计算随机放置的认知无线电(CR)的存在下,主接收器所遇到的聚合干扰。我们发现,将距离衰减和对数正态衰落的影响,在聚合物中的每一个组成的干扰,导致一个复合干扰,不能令人满意地模拟的对数正态分布。使用干扰统计数据,我们确定了部署CR所需的一些关键参数。例如,在不同类型的衰落环境和可接受的干扰水平下保护主接收机所需的禁区半径,以及可以部署的CR数量。我们进一步表明,如果CR有先验知识的无线电环境地图(REM),那么可以部署大量的CR,特别是在高密度的环境。给定REM信息,我们还研究了通过两种不同类型的技术来处理调度信息所实现的CR数。

英文摘要:

In this paper we describe a model for calculating the aggregate interference encountered by primary receivers in the presence of randomly placed cognitive radios (CRs). We show that incorporating the impact of distance attenuation and lognormal fading on each constituent interferer in the aggregate, leads to a composite interference that cannot be satisfactorily modeled by a lognormal. Using the interference statistics we determine a number of key parameters needed for the deployment of CRs. Examples of these are the exclusion zone radius, needed to protect the primary receiver under different types of fading environments and acceptable interference levels, and the numbers of CRs that can be deployed. We further show that if the CRs have apriori knowledge of the radio environment map (REM), then a much larger number of CRs can be deployed especially in a high density environment. Given REM information, we also look at the CR numbers achieved by two different types of techniques to process the scheduling information.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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