Adaptive Sensing of Congested Spectrum Bands
Adaptive Sensing of Congested Spectrum Bands
复制标题
拥塞频段的自适应感知
DOI：
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发表时间：
2012
影响因子：
2.5
通讯作者：
Xiaodong Wang
中科院分区：
文献类型：
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作者：
A. Tajer;R. Castro;Xiaodong Wang
认知无线电集体处理它们感测到的信息，以便机会主义地识别和访问未充分利用的频谱段（频谱空洞）。由于频谱占用的瞬态和快速变化的性质，认知无线电（二次用户）必须在识别频谱空洞，以提高其频谱效率的敏捷。我们提出了一种新的自适应过程，以加强敏捷性的次级用户识别多个频谱空洞同时在一个宽的频谱带。这是通过连续探索潜在频谱空洞的集合并逐步将感测资源分配给频谱的最有希望的区域来实现的。这样的探索和资源分配导致感测资源的保守花费，并转化为非常灵活的频谱监测。所提出的连续和自适应感测过程与在整个频谱上均匀分布采样资源的更传统的方法相反。除了改进的灵活性之外，自适应过程需要对主用户的功率的不太严格的约束，以保证它们保持与环境噪声的区分，并呈现更可靠的频谱空洞检测。
Cognitive radios process their sensed information collectively in order to opportunistically identify and access underutilized spectrum segments (spectrum holes). Due to the transient and rapidly varying nature of the spectrum occupancy, the cognitive radios (secondary users) must be agile in identifying the spectrum holes in order to enhance their spectral efficiency. We propose a novel adaptive procedure to reinforce the agility of the secondary users for identifying multiple spectrum holes simultaneously over a wide spectrum band. This is accomplished by successively exploring the set of potential spectrum holes and progressively allocating the sensing resources to the most promising areas of the spectrum. Such exploration and resource allocation results in conservative spending of the sensing resources and translates into very agile spectrum monitoring. The proposed successive and adaptive sensing procedure is in contrast to the more conventional approaches that distribute the sampling resources equally over the entire spectrum. Besides improved agility, the adaptive procedure requires less-stringent constraints on the power of the primary users to guarantee that they remain distinguishable from the environment noise and renders more reliable spectrum hole detection.