主用户移动场景下的感知用户时间分配算法

发布时间：2018-07-20 15:47

【摘要】：传统的认知无线电技术主要针对主用户和感知用户静止的认知网络,近年来对于用户移动性的研究逐渐成为了研究热点。认知网络在多媒体接入技术中应用广泛,而多媒体接入技术的协议多是基于时间分配的,本文对主用户移动场景下感知用户的时间分配方法开展了研究工作:首先构建了认知无线电网络下主用户在感知用户的干扰域内和干扰域外的时间分配模型,并从用户移动的角度给出了单个感知用户可用的传输时间,并提出了感知时间门限的问题,即由于主用户的移动性,频谱感知算法的感知准确性不会因为感知时间的延长而提高。之后为了给出实际中可以应用的时间参数设计方法,特别针对随机模型中最为常用的随机游走模型,给出了单感知用户占用频谱情况下最优传输时间和感知时间门限的表达式,并进行了仿真实验以验证方法的正确性。
[Abstract]:The traditional cognitive radio technology is mainly aimed at the static cognitive networks of primary and perceptual users. In recent years, the research on user mobility has gradually become a research hotspot. Cognitive network is widely used in multimedia access technology, and the protocols of multimedia access technology are mostly based on time allocation. In this paper, the methods of time allocation for sensing users in mobile environment are studied. Firstly, a time allocation model of primary users in and out of the cognitive radio network is constructed. From the point of view of user mobility, the transmission time available to a single perceived user is given, and the problem of perceptual time threshold is raised, that is, due to the mobility of the primary user, The sensing accuracy of spectrum sensing algorithm will not be improved by the extension of sensing time. Then, in order to give the time parameter design method that can be used in practice, especially for the random walk model, the expression of the optimal transmission time and perceptual time threshold under the condition that the single perceptual user occupies the spectrum is given, especially for the random walk model which is most commonly used in the random model. Simulation experiments are carried out to verify the correctness of the method.
【作者单位】：哈尔滨工业大学电子与信息工程学院;哈尔滨工业大学航天学院;
【基金】：国家自然科学基金资助项目(No.61603115) 中国博士后科学基金资助项目(No.2015M81455) 2015年黑龙江省博士后资助经费(No.LBH-Z15085) 微小型航天器技术国防重点学科实验室开放基金资助项目(No.HIT.KLOF.MST.201501,HIT.KLOF.MST.201601)
【分类号】：TN925

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