Utilizing an approximate formula of the first kind zero-order modified Bessel function I 0(x), an approximate closed form of cumulative distribution function(CDF) of a Rice random variable (RRV) is worked out.

• 应用第一类零阶修正的贝塞尔函数I0 (x)一个近似式 ,推导Rice随机变量的概率分布函数 (CDF)的近似闭式。