这是一个基于802.15.3a的S_V模型，时间按双泊松分布，幅度双指数分布，可更改CM1/CM2/CM3/CM4的参数，得到四种不同情况下的多径分布-This is a model based on 802.15.3a the S_V time by double Poisson distribution, amplitude double exponential distribution, the parameters can be changed CM1/CM2/CM3/CM4 obtai