频谱池系统的频谱效率
Spectral Efficiency of Spectrum Pooling Systems
摘要：
在这篇文章中，我们研究了使用认知无线电重用本地未使用的频谱，以增加系统的总容量的想法。我们考虑一个多频带/宽带系统中的主要和认知用户希望通信到不同的接收机，受到相互干扰，并假设每个用户只知道他的信道和未使用的频谱，通过适当的感知。该方案的基本思想是基于频谱池的概念。这个想法很简单：认知无线电将监听信道，如果感知到空闲，将在空闲期间发送。事实证明，虽然它的简单性，所提出的计划表现出非常有趣的功能，频谱效率和最大数量的可能成对的认知通信。我们施加的约束，用户连续传输可用的频段，通过自私的水填充。对于第一次，我们的研究量化了渐近（相对于频带）可实现的增益，使用频谱池的频谱效率相比，经典的无线电系统。然后，我们推导出总的频谱效率，以及可能的成对通信的最大数量这样的频谱池系统。
英文摘要：
In this contribution, we investigate the idea of using cognitive radio to reuse locally unused spectrum to increase the total system capacity. We consider a multiband/wideband system in which the primary and cognitive users wish to communicate to different receivers, subject to mutual interference and assume that each user knows only his channel and the unused spectrum through adequate sensing. The basic idea under the proposed scheme is based on the notion of spectrum pooling. The idea is quite simple: a cognitive radio will listen to the channel and, if sensed idle, will transmit during the voids. It turns out that, although its simplicity, the proposed scheme showed very interesting features with respect to the spectral efficiency and the maximum number of possible pairwise cognitive communications. We impose the constraint that users successively transmit over available bands through selfish water filling. For the first time, our study has quantified the asymptotic (with respect to the band) achievable gain of using spectrum pooling in terms of spectral efficiency compared to classical radio systems. We then derive the total spectral efficiency as well as the maximum number of possible pairwise communications of such a spectrum pooling system.
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