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基于极限特征值之差的改进频谱感知算法
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作者 田堃 谭哲文 +2 位作者 谭宇豪 雷可君 杨喜 《吉首大学学报(自然科学版)》 CAS 2024年第2期35-39,44,共6页
基于取样协方差矩阵的最大和最小特征值之差的频谱感知算法,从提高感知判决门限的设置准确度出发,利用Wishart随机矩阵极限特征值分布的最新成果,设计出了一种新的判决门限计算方法.仿真实验结果表明,相对于现有的频谱感知算法,新算法... 基于取样协方差矩阵的最大和最小特征值之差的频谱感知算法,从提高感知判决门限的设置准确度出发,利用Wishart随机矩阵极限特征值分布的最新成果,设计出了一种新的判决门限计算方法.仿真实验结果表明,相对于现有的频谱感知算法,新算法的判决门限计算更加准确,在改善判决结果可靠性的同时,有效地提升了有限样本数量条件下算法的检测性能. 展开更多
关键词 认知无线电 频谱感知 Wishart矩阵 极限特征值 Tracy-Widom分布
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Transition Distributions of Young Diagrams Under Periodically Weighted Plancherel Measures
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作者 Zhong-gen Su 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2009年第4期655-674,共20页
Kerov[16,17] proved that Wigner's semi-circular law in Gauss[an unitary ensembles is the transition distribution of the omega curve discovered by Vershik and Kerov[34] for the limit shape of random partitions under t... Kerov[16,17] proved that Wigner's semi-circular law in Gauss[an unitary ensembles is the transition distribution of the omega curve discovered by Vershik and Kerov[34] for the limit shape of random partitions under the Plancherel measure. This establishes a close link between random Plancherel partitions and Gauss[an unitary ensembles, In this paper we aim to consider a general problem, namely, to characterize the transition distribution of the limit shape of random Young diagrams under Poissonized Plancherel measures in a periodic potential, which naturally arises in Nekrasov's partition functions and is further studied by Nekrasov and Okounkov[25] and Okounkov[28,29]. We also find an associated matrix mode[ for this transition distribution. Our argument is based on a purely geometric analysis on the relation between matrix models and SeibergWitten differentials. 展开更多
关键词 limit shape limiting density of eigenvalues Poissonized Plancherel measures in a periodic potential Transition distributions Unitary invariant matrix models
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