IEEE 802.22.3中噪声方差不确定性对频谱感知的影响

G. Cerro, L. Ferrigno, E. Grossi, G. Miele, L. Venturino, D. Capriglione
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引用次数: 0

摘要

分析了噪声方差不确定性对动态频谱接入框架下基于能量检测的频谱感知算法性能的影响。该分析是基于使用商用软件定义无线电在肯定空闲的信道上进行的频谱采集。然后在模拟环境中通过施加在持续48小时的实验活动中实际功率测量中测量的变化来评估噪声方差变异性的影响。所取得的结果清楚地证明,在检测和误报警的概率方面,性能都有显著的下降,这反过来又可能导致频谱感知性能不符合IEEE 802.22.3等国际标准给出的约束。为了使噪声不确定性保持在可容忍的范围内,本文为进一步的研究提供了一个噪声功率估计周期的上界。
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The effect of noise variance uncertainty for spectrum sensing in IEEE 802.22.3
The paper analyses the influence of noise variance uncertainty on the performance of an energy detection-based spectrum sensing algorithm thought for the Dynamic Spectrum Access framework. The analysis is based on spectrum acquisitions carried out on surely vacant channels by employing a commercial Software Defined Radio. The effects of noise variance variability is then evaluated in simulation environment by imposing the variations measured in actual power measurements during the experimental campaign lasting 48-hours. The achieved results clearly prove a significant performance degradation in terms of probability of both detection and false alarm, which in turn could provoke the loss of compliance of the spectrum sensing performance with respect to constraints given by international standards, as IEEE 802.22.3. The paper paths the way to further investigations aiming at providing an upper bound to noise power estimation time period in order to keep the noise uncertainty under tolerable limits.
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