α稳定分布噪声下数字频移键控信号的分数低阶循环谱分析

发布时间：2018-03-13 07:42

本文选题：α稳定分布噪声　切入点：FSK信号　出处：《电波科学学报》2017年01期 　论文类型：期刊论文

【摘要】：针对α稳定分布噪声环境下数字通信信号的二阶与高阶循环统计特征显著退化问题,结合分数低阶矩和共变理论对二进制频移键控(Frequency Shift Keying,FSK)信号的分数低阶循环谱公式进行了理论推导,并对2FSK信号在不同混合信噪比、分数阶因子和特征指数条件下的分数低阶循环谱进行了详细的仿真分析.理论和仿真结果表明:2FSK信号分数低阶与二阶的循环谱结构相同,其谱峰对应的循环频率相同,谱峰的幅度值不同,取决于循环谱的阶因子.相对于在低混合信噪比下失效的二阶循环谱,分数低阶循环谱对α稳定分布噪声具有更强的抗干扰性和适用性.
[Abstract]:For the second order and high order cyclic statistical characteristics of digital communication signals in a stable distributed noise environment, the second order and high order cyclic statistical characteristics degenerate significantly. The fractional low order cyclic spectrum formula of binary frequency shift keying Shift key FSKS signal is derived by combining fractional low order moment and covariant theory, and the signal to noise ratio of 2FSK signal is compared with that of 2FSK signal in different mixing signal to noise ratio. Under the condition of fractional factor and characteristic exponent, the fractional low order cyclic spectrum is analyzed in detail. The theoretical and simulation results show that the fractional low order cyclic spectrum structure is the same as the second order cyclic spectrum structure, and the cyclic frequency corresponding to the spectral peak is the same. The amplitude of the spectral peak depends on the order factor of the cyclic spectrum. Compared with the second order cyclic spectrum which fails at low mixed signal-to-noise ratio, the fractional low order cyclic spectrum has stronger anti-interference and applicability to the 伪 -stable distributed noise.
【作者单位】：西安理工大学自动化与信息工程学院;
【基金】：国家自然科学基金(No.61671375)
【分类号】：TN911.7

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