一类特殊先验分布的相关电磁噪声模型  

Correlated Electromagnetic Noise Models with Special A-Priori Distribution

作　　者：扈罗全[1] 陆全荣[1] 谢海俊[1] 徐进[2] 

机构地区：[1]苏州出入境检验检疫局,江苏苏州215128 [2]苏州大学电子信息学院,江苏苏州215021

出　　处：《苏州大学学报（工科版）》2008年第6期1-5,共5页Journal of Soochow University Engineering Science Edition (Bimonthly)

基　　金：国家自然科学基金资助项目(编号60572024;60772061);教育部博士点基金资助项目(编号200509230031);江苏出入境检验检疫局科研资助项目(编号2008KJ11)

摘　　要：把随机微分方程等效为Markov扩散过程,可以产生许多非常规的相关电磁噪声。根据SDE的理论结果确定该扩散过程的模型系数,以半圆分布和均匀分布为例给出这类特殊分布的生成模型并进行仿真分析。对于前者这类在x轴上存在两个不连续点的概率密度函数,算法需要使用舍去法选择有效随机样本。对于后者,使用具有指数函数形式的归一化函数近似均匀分布随机变量所满足的概率密度分布,以避免分布函数的不连续点对数值算法的负面影响。使用SDE方法可以产生很大一类特殊先验分布的电磁噪声,算法结构简单,宜于被移植进硬件电路。Stochastic differential equation can be regarded as diffusion process, by which many special electromagnetic noise can be generated easily. Model parameters of diffusion process are determined according to the results of SDEs＇ theory. Take the semicircular distribution and uniform distribution for examples, the related generation models are derived. The former should adopt the judgement-abandonment in order to choose the appropriate samples because the pdf is discontinuous. However, the latter should adopt the exponential function to approximate original uniform distribution in order to avoid the negative effect of the discontinuous points. The SDE method can effectively generate many electromagnetic noise with special a-priori distribution. The algorithm is simple and can be embedded into the hardware.

关 键 词：无线通信 随机微分方程 电磁噪声 半圆分布 均匀分布 

分 类 号：TN929.5[电子电信—通信与信息系统]