卫星信道衰减模型研究及试验分析  

Research of Satellite Fading Channel Model and Its Experimental Analysis

作　　者：曾斌[1] 李之棠[1] 王威[2] 

机构地区：[1]华中科技大学计算机学院,湖北武汉430074 [2]海军工程大学管理工程系,湖北武汉430030

出　　处：《系统仿真学报》2007年第3期620-622,626,共4页Journal of System Simulation

基　　金：国家"八六三"高技术研究发展计划基金(2002AA7170)

摘　　要：提出了一种基于时间序列的星-地通信链路衰减模型。模型利用一个目标聚类算法把大量衰减事件归纳为4类,然后通过改进的4状态马尔可夫链产生能够反映季节和气象变化的弹性时间序列,从而较为真实的模拟出链路衰减时的数据报丢失和重传等状态。在该模型基础上对多播文件传输协议进行了试验和分析。In order to model fading channel in satellite-to-Earth or Earth-to-satellite links, a synthetic time-series model was proposed. In this model, an objective clustering algorithm was applied to break down the large volume of fade events into different states, then an improved 4-state Markov model was developed which provides realistic time series considering seasonal and weather variations. Based on the model, simulations and analysis on the multicast protocols were carried out. Simulation results show that this model can simulate packet loss and unnecessary retransmission （form source or receiver） when link is unavailable realistically.

关 键 词：卫星链路 衰减信道模型 网络仿真 有效吞吐率 马尔可夫模型 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]