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论文类型： 期刊论文

发表时间： 2018-01-01

发表刊物： AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS

收录刊物： SCIE

卷号： 93

页面范围： 268-276

ISSN号： 1434-8411

关键字： Impulsive noise; Fractional ambiguity function; Sigmoid transform; Quadratic FM signal

摘要： To overcome the limitations that the second-order statistics based methods rely heavily on gaussianity assumption and the fractional lower-order statistics based methods depend on the priori knowledge of nonGaussian noise, two novel concepts, the Sigmoid transform based instantaneous correlation function and Sigmoid transform based fractional ambiguity function, are defined firstly. Based on these definitions, a novel phase parameters estimation method of the quadratic FM signal is proposed in impulsive noise environment. Furthermore, the property of the Sigmoid transform is presented and proved. Simulations have verified its superior performances over existing methods based on fractional ambiguity function or fractional ambiguity function based on fractional lower order statistic, especially under impulsive noise. Meanwhile, it does not depend on the priori knowledge of noise.