Opportunistic Spectrum Access in Cognitive Radio Networks
Opportunistic Spectrum Access in Cognitive Radio Networks
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DOI：
10.1109/ijcnn.2008.4634283
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
Senhua Huang;Xin Liu;Z. Ding
中科院分区：
文献类型：
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作者：
Senhua Huang;Xin Liu;Z. Ding
在监管举措和无线电技术进步的推动下，机会性频谱接入具有缓解频谱稀缺和满足日益增长的频谱需求的潜力。在本文中，我们考虑一种场景，其中次级用户可以机会性地访问由空闲的主用户腾出的未使用的频谱。我们引入了两个度量来保护主要性能，即冲突概率和重叠时间。我们提出了三种使用不同的侦听、退避和传输机制的频谱接入方案。我们证明了在给定的主要约束条件下，它们获得了不可区分的次要性能。我们给出了二次用户性能的封闭形式分析，给出了紧凑的容量上限，并揭示了各种设计方案的影响，如侦听、分组长度分布、退避时间、分组开销和分组。我们的工作揭示了机会性频谱接入的基本特性和设计标准。
Driven by regulatory initiatives and radio technology advances, opportunistic spectrum access has the potential to mitigate spectrum scarcity and meet the increasing demand for spectrum. In this paper, we consider a scenario where secondary users can opportunistically access unused spectrum vacated by idle primaries. We introduce two metrics to protect primary performance, namely collision probability and overlapping time. We present three spectrum access schemes using different sensing, back-off, and transmission mechanisms. We show that they achieve indistinguishable secondary performance under given primary constraints. We provide closed form analysis on secondary user performance, present a tight capacity upper bound, and reveal the impact of various design options, such as sensing, packet length distribution, back-off time, packet overhead, and grouping. Our work sheds light on the fundamental properties and design criteria on opportunistic spectrum access.