【摘要】 本文提出了一种基于半马尔可夫模型的VHF信道访问协议分析方法 .在建立空地数据链信道访问的状态分析模型的基础上 ,通过将状态平均停留时间和状态转移概率同时引入模型中 ,给出了信道处于安全状态概率和系统忙用户数的表达 ,为信道访问协议的性能分析和评价提供了一种新的方法 .这种方法不需限制系统参数分布为指数分布 ,更接近实际情况 ,将其用于VHF空地数据链系统的仿真结果表明 ,该方法是行之有效的更多还原

【Abstract】 A new method of VHF channel access protocol analysis based on semi Markov model is presented in this paper.A model of channel access state transition for air ground datalink is established.By introducing the state mean holding times(HT) and state transition probabilities (TP) into this model,the presentation of the safe state probability and the number of busy users is obtained,which is a new way for property analysis and evaluation of channel access protocol.By using this approach,system parameters are not restricted to an exponential distribution,which is close to the practical situation.The method has been applied into VHF datalink system and the simulation results show that it is effective.更多还原