AOS空间通信系统中自适应帧生成算法  

Adaptive Frame Generation Algorithm in AOS Space Communications Systems

作　　者：刘立士[1] 田野[1] 徐野[1] 付钰[1] 赵晓曦[1] LIU Li-shi;TIAN Ye;XU Ye;FU Yu;ZHAO Xiao-xi(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学,沈阳110159

出　　处：《宇航学报》2018年第7期769-776,共8页Journal of Astronautics

基　　金：国家自然科学基金资助(61471247;61501307);辽宁特聘教授项目资助;辽宁省高等学校优秀人才支持计划资助(LR2015057);辽宁省"百千万人才工程"培养经费资助(2014921044);辽宁省教育厅一般项目资助(L2015459);沈阳理工大学重点实验室资助(4771004kfs47)

摘　　要：针对泊松流模型已经不再适合日益复杂的研究空间通信系统中帧生成算法的问题,在自相似流量模型下,对AOS空间通信系统中的帧生成算法的性能进行研究。通过严格的理论分析,给出自适应帧生成算法在有限缓存下的缓存溢出概率以及复用效率计算公式。通过将自适应帧生成算法分解为高效率算法与等时算法的叠加,得到平均包时延的计算公式。理论分析与仿真结果校验了计算公式的正确性。得出在有限缓存下,不能依靠无限增大缓存容量达到降低溢出概率,适当选择门限值和控制帧提取时间,可以有效提高该算法性能的结论,为空间通信系统的实际应用提供理论支持。Aiming at Poisson flow model no longer suitable for the study of frame generation algorithm in the increasingly complex space communication system,the performance of the frame generation algorithm in the AOS space communications systems is studied based on the self-similar traffic model. Through the strict theoretical analysis,the distribution of the cache overflow probability of the adaptive frame generation algorithm and the calculation formula of the multiplexing efficiency under the limited cache are given. Furthermore,by decomposing the adaptive frame generation algorithm into the superposition of high efficiency algorithm and the periodic frame generation algorithm,the average packet time delay of the adaptive frame generation algorithm is obtained. Theoretical analysis and simulation results prove the correctness of the calculation formula. The conclusions are drawn that under the limited cache,the purpose of reducing overflow probability can not be achieved by unlimited increase of the cache capacity,and the performance of the algorithm can be improved effectively by selecting the threshold value and controlling the frame extraction time. The theoretical support in this paper could be provided for the practical applications of the space communications systems.

关 键 词：自相似流量 自适应帧生成算法 溢出概率 复用效率 包时延 

分 类 号：TN925[电子电信—通信与信息系统]