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Quickest Wideband Spectrum Sensing Over Correlated Channels

机译：相关通道上最快的宽带频谱检测

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摘要

Quickest spectrum sensing seeks to optimize a balance between two opposing performance measures, one being the delay in identifying spectrum opportunities, and the other being the quality of the decision. The existing spectrum sensing approaches formed based on quickest detection theory rely on the assumption that the occupancy states of different spectrum bands over a wideband spectrum are statistically independent. This is an assumption that cannot be met in practice, especially in broadband communication schemes in which radio channels are dynamically grouped in bundles and allocated to different users based on the users' traffic needs. As a result of such channel grouping and allocation, the occupancy states of the channels, especially the adjacent ones, are correlated. This paper, in contrast to the existing literature on quickest spectrum sensing, considers a wideband spectrum in which the occupancy states of different channels follow a pre-specified dependency kernel. The objective is to design the spectrum sensing approach for identifying spectrum holes, which aims to minimize the average delay in identifying spectrum opportunities while assuring, in parallel, certain guarantees on the quality of the decision. The closed-form characterization of the optimal sensing scheme is delineated and it is shown that this optimal scheme has low computational complexity.
机译：最快的频谱感知力求在两个相对的性能指标之间实现最佳平衡，一个是确定频谱机会的延迟，另一个是决策质量。基于最快检测理论形成的现有频谱感测方法依赖于这样的假设，即宽带频谱上不同频谱带的占用状态在统计上是独立的。这是一个在实践中无法满足的假设，尤其是在宽带通信方案中，在该方案中，无线信道被动态捆绑在一起并根据用户的业务需求分配给不同的用户。作为这种信道分组和分配的结果，信道的占用状态，尤其是相邻信道的占用状态是相关的。与现有有关最快频谱感测的文献相反，本文考虑了宽带频谱，其中不同信道的占用状态遵循预先指定的依赖性内核。目的是设计一种用于识别频谱漏洞的频谱感测方法，该方法旨在最大程度地减少识别频谱机会的平均延迟，同时确保对决策质量的某些保证。描绘了最优感测方案的闭合形式特征，并且表明该最优方案具有较低的计算复杂度。

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