一种适用于非城市区域的卫星移动信道统计模型

A Statistical Mobile Satellite Channel Model for Non-urban Areas

本文提出了一种适用于非城市区域的卫星移动信道统计模型—莱斯 K模型 ,采用K 分布来描述由于遮蔽引起的接收信号包络的缓慢变化 ,用莱斯分布来描述包含直视信号分量 (主径 )在内的多径快衰落 ,得到了接收信号包络的概率分布和误比特率 .在此基础上 ,本文利用样本矩对莱斯 K模型参数进行了估计并对参数估计性能进行了评价 .最后 ,本文利用实测数据对模型进行了验证 .

This paper presents Rice-K model which is statistical for a land mobile satellite link in non-urban areas.This model assumes that the slow changes on the received signal envelope are K-dsitributed due to the shadowing and the multi-path fading including the line of sight path component is Rician distributed.On this basis,the expressions of cumulative density probability function (c.d.f) and the bit error probability of the received signal envelope are derived.Furthermore,the parameters of Rice-K model are estimated by means of moment method in which sample moments and normalised sample moments are used.Also,performance of this kind of parameter estimation is studied.Finally,Rice-K model is validated through the comparison between measured data and the analytical curve given by Rice-K model.