Adaptive spectrum sensing for agile cognitive radios
Adaptive spectrum sensing for agile cognitive radios
复制标题
适用于敏捷认知无线电的自适应频谱感知
DOI：
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发表时间：
2010
期刊：
影响因子：
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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
频谱的大部分被许可给特定用户用于特定应用。然而，这些传统用户常常没有充分利用他们指定的频谱段。未经许可的（二级）用户可以从这一事实中受益，并机会性地利用空闲频谱段（频谱空洞）。由于频谱占用的瞬态性质，二级用户必须快速识别此类频谱空洞。为了实现这一目标，我们提出了一种新颖的顺序和自适应频谱感知程序。该过程的基本概念是逐步将传感资源分配给频谱中最有前途的区域。与在整个频谱上均匀分配传感预算的更传统方法相比，这意味着准确识别频谱空洞所需的传感资源和时间的减少。所提出的方法在理论上是合理的，并且得到了仿真结果的进一步支持。
Vast segments of the frequency spectrum are licensed to specific users for particular applications. These legacy users, however, often under-utilize their designated spectrum segments. Unlicensed (secondary) users can benefit from this fact and opportunistically exploit the vacant spectrum segments (spectral holes). Due to the transient nature of the spectrum occupancy it becomes imperative for secondary users to quickly identify such spectral holes. To accomplish this, we propose a novel sequential and adaptive spectrum sensing procedure. The underlying notion of this procedure is to progressively allocate the sensing resources to only the most promising areas of the spectrum. This translates in a reduction of sensing resources and time needed to accurately identify spectrum holes, in contrast with more conventional approaches that allocate the sensing budget over the entire spectrum uniformly. The proposed method is theoretically sound and further supported by simulation results.