LDLT Decomposition Based Spectrum Sensing in Cognitive Radio Using Hard Decision Criterion

G. Lu, Yuxin Li, Yinghui Ye
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引用次数: 2

Abstract

Inspired by random matrix theory, a quantity of eigenvalue based cooperative spectrum sensing methods have been proposed. The results are based on the asymptotical assumptions in need of large numbers of users and samples, which result in inferior performance with a few users. In this paper, sensing methods based on maximum eigenvalue and minimum eigenvalue of LDLT decomposition are proposed respectively with a view to improve the accuracy of decision threshold by means of hard decision criterion. The corresponding expressions of false alarm probability are also derived. Finally, both theoretical analyses and simulations demonstrate that the proposed two methods perform better than the existing eigenvalue based sensing methods for accurate decision threshold.
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基于LDLT分解的认知无线电频谱感知硬决策准则
受随机矩阵理论的启发,提出了一系列基于特征值的协同频谱感知方法。结果基于渐近假设,需要大量用户和样本,这导致在少量用户时性能较差。本文分别提出了基于LDLT分解的最大特征值和最小特征值的感知方法,以期通过硬决策准则提高决策阈值的准确性。并推导出相应的虚警概率表达式。最后,理论分析和仿真结果表明,本文提出的两种方法比现有的基于特征值的感知方法更能获得准确的决策阈值。
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