Open Spectrum systems offer an attractive solution to the reuse of under-utilized licensed spectrum. Existing proposals take a reactive sense-and-avoid approach to impulsively reconfigure spectrum usage without any knowledge of future dynamics. We propose a proactive spectrum access approach where secondary users utilize past observations to build predictive models on spectrum availability, and intelligently plan channel usage to maximize utilization and minimize disruptions to primary users. Based on the characteristics of TV-broadcast, we develop a simple availability metric and apply a usability filter to eliminate unreliable channels with heavy and frequent appearance of primary users. Our experimental results show that the proactive approach can significantly reduce the number of disruptions. We also observe a clear tradeoff between the disruption rate and the throughput at secondary users. By varying the usability filter threshold, we can to control this tradeoff according to the constraints of primary users and the application requirements at secondary users.
开放频谱系统为未充分利用的许可频谱的重用提供了一种有吸引力的解决方案。现有建议采用一种反应灵敏的避免方法来冲动地重新配置频谱使用,而无需任何有关未来动态的知识。我们提出了一种主动的频谱访问方法,其中,二级用户可以利用过去的观察结果来建立频谱可用性的预测模型,并智能地规划信道使用率,以最大限度地提高利用率并最大程度地减少对主要用户的干扰。根据电视广播的特征,我们开发了一个简单的可用性指标,并应用了可用性过滤器,以消除主要用户频繁出现的不可靠频道。我们的实验结果表明,主动方法可以显着减少中断次数。我们还观察到中断率和二级用户的吞吐量之间存在明显的权衡。通过更改可用性过滤器阈值,我们可以根据主要用户的约束和次要用户的应用程序要求来控制此折衷。 P>
University of California, Santa Barbara, CA;
机译:可重构天线和动态频谱访问算法:集成在可靠通信的认知无线电平台中
机译:网络编码通信中的可靠频谱感知和机会访问
机译:针对异步通道间频谱感知的主动跳频动态频谱访问
机译:从频谱敏捷性到网络敏捷性:主动和自适应重新配置,以实现战术网络中的可靠通信
机译:新兴网络中D2D通信的认知频谱访问。
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机译:通过主动频谱访问实现可靠的开放频谱通信