Cognitive Radio Operation under Directional Primary Interference and Practical Path Loss Models
Cognitive Radio Operation under Directional Primary Interference and Practical Path Loss Models
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DOI：
10.1587/transcom.e94.b.1243
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
K. Nishimori;Rocco Di Taranto;H. Yomo;P. Popovski
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文献类型：
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作者：
K. Nishimori;Rocco Di Taranto;H. Yomo;P. Popovski
本文讨论了在主系统的服务区域内部署短程认知无线电（二次通信系统）的可能性。虽然次系统干扰主系统，但是在主系统的服务区域中存在认知无线电可以重用主系统的频率而不会对其造成有害干扰并且不受主系统干扰的某些位置。这些位置被称为具有用于次级系统中的通信的空间机会，因为它可以重新使用初级系统的频率。仿真结果表明，天线增益、波束宽度和传播路径损耗对次用户的频率复用空间机会有很大影响。结果表明，当主系统用户配备定向天线时，空间频谱复用率可以显著提高。本研究的一个重要组成部分是异构路径损耗模型，即，主系统内的路径损耗模型不同于用于计算主系统和次系统之间的干扰的模型。我们的研究结果表明，在主/次系统中的实际天线高度对应的传播模型可以在很大程度上影响频谱复用的认知无线电的可能性。
This paper discusses the possibility of deploying a short-range cognitive radio (secondary communication system) within the service area of a primary system. Although the secondary system interferes with the primary system, there are certain locations in the service area of the primary system where the cognitive radio can reuse the frequency of the primary system without causing harmful interference to it and being disturbed by the primary system. These locations are referred to as having a spatial opportunity for communications in the secondary system, since it can reuse the frequency of the primary system. Simulation results indicate that the antenna gain, beamwidth, and propagation path loss greatly affect the spatial opportunity of frequency reuse for the secondary users. The results show that spatial spectrum reuse can be significantly increased when the primary system users are equipped with directional antennas. An important component in this study is the heterogeneous path loss model, i.e., the path loss model within the primary system is different from the model used to calculate the interference between the primary and the secondary systems. Our results show that the propagation models corresponding to the actual antenna heights in the primary/secondary system can largely impact the possibilities for spectrum reuse by the cognitive radios.