Spectrum allocation based on the time-varying characteristic of the spectrum holes in cognitive radio
Spectrum allocation based on the time-varying characteristic of the spectrum holes in cognitive radio
复制标题
认知无线电中基于频谱空洞时变特性的频谱分配
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Yinghai Zhang
中科院分区：
文献类型：
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作者：
Weidong Wang;Shufang Mo;Fan Li;Shoufeng Wang;Yinghai Zhang
认知无线电中的频谱空洞具有时变特性。主用户的活跃度是时变特性中关注的因素之一。另一个因素是，监听主用户S在不同地理位置的活动的第二用户，可以在同一频谱洞上获得不同的主用户到达率。第三个因素是不同的第二用户被同一频谱空洞上的返回主用户中断的概率。首先，对系统的时变特性进行了定量分析。其次，提出了基于时变特性的频谱分配算法来优化二次用户与频谱空洞的匹配，引入了重复贪婪算法。最后，通过仿真对系统的性能进行了评估。
Spectrum hole has the time-varying characteristic in cognitive radio. The activity of the primary user is one of the concerned factors in time-varying characteristic. Another factor is that the second users, who monitor the activity of the primary user s in different geographic locations, could get various arrival rates of primary users on the same spectrum hole. The third factor is the probability of different second users being interrupted by returning primary users on the same spectrum hole. Firstly, the quantitative analyses for time-varying characteristic are studied. Secondly, the spectrum allocation algorithm based on time-varying characteristic is proposed to optimize the matching between second users and spectrum holes, which introduces the repeated greedy algorithm. Thirdly, the performance is evaluated by simulation.