Throughput Analysis of Opportunistic Access Strategies in Hybrid Underlay—Overlay Cognitive Radio Networks
Throughput Analysis of Opportunistic Access Strategies in Hybrid Underlay—Overlay Cognitive Radio Networks
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DOI：
10.1109/twc.2012.032712.101209
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发表时间：
2012-04
影响因子：
10.4
通讯作者：
S. Senthuran;A. Anpalagan;O. Das
中科院分区：
文献类型：
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作者：
S. Senthuran;A. Anpalagan;O. Das
在认知无线电网络中，有效利用未充分利用的频谱资源而不影响主用户是非常重要的。在底层系统中，允许次要用户与主要用户同时共享信道（限制干扰水平），但在覆盖系统中则不然。在这篇文章中，我们考虑一个系统，其中一个次要用户可以在覆盖和重叠模式之间切换的操作，以提高其吞吐量有限的传感能力（即感测只有一个通道的时间）。利用蒙特-卡罗模拟对马尔可夫链分析的结果进行了验证。研究发现，传输模式的适当选择可以为次用户提供更大的吞吐量改善。模式选择取决于主用户的转换特性和两种操作模式之间的吞吐量比。
In cognitive radio networks, it is important to effectively use the under-utilized spectrum resources without affecting the primary users. In an underlay system, secondary users are allowed to share the channel simultaneously with primary users (with the restriction on interference level) but not in an overlay system. In this article, we consider a system where a secondary user can switch between overlay and underlay modes of operation in order to improve its throughput with limited sensing capability (i.e. sensing only one channel at a time). The results based on Markov chain analysis are satisfactorily verified using Monte-Carlo simulation. It is found that proper selection of transmission mode can provide greater improvement in throughput for a secondary user. The mode selection depends on the transition characteristics of primary users and the throughput ratio between the two modes of operation.