基于移动模型的移动自组网干扰分布特征仿真研究  

Simulation study on distribution characteristics of ad-hoc networks based on mobile models

作　　者：谭国平 朱燕丹 唐璐瑶[1] 李岳衡[1] 

机构地区：[1]河海大学计算机与信息学院,南京211100

出　　处：《高技术通讯》2014年第12期1221-1227,共7页Chinese High Technology Letters

基　　金：国家自然科学基金(61001068);教育部博士点基金(20100094120017)资助项目

摘　　要：为了分析移动自组网络中的干扰情况,以改善网络的整体性能,引入了三个常见的移动模型——随机路点(RWP)移动模型、高斯-马尔可夫(GMS)模型和参考点组(RPG)移动模型,并采用基于泊松点过程(PPP)的节点空间干扰分布的理论统计几何方法研究了移动自组网络干扰特征,然后利用NS-2软件搭建了基于有冲突避免的载波监听多路访问(CSMA/CA)机制的干扰仿真平台,仿真分析了基于泊松点过程的和基于不同移动模型的干扰的累积分布函数(CDF)及概率密度函数(PDF)。研究发现无线信道间的干扰会极大地影响移动自组网的性能,而在接收节点处的干扰特征主要是由干扰发送节点的几何分布决定的;泊松点过程的干扰分布特征和随机路点移动模型较相似,但与其他两个移动模型存在很大差异。最后分析了存在差异的原因。To analyst the interference in wireless ad-hoc networks to improve the networks＇ performance, three common mobile models, i. e. the random waypoint （RWP）model, the Gauss-Markov （GM）model and the reference point group （RPG）model were applied to study. A stochastic geometry approach was used to investigate the spatial distribution of the interferences in a wireless ad-hoc network based on the Poisson point process（PPP） model, and an interference simulation platform constructed based on the mechanism of the carrier sense multiple access with collision avoidance（CSMA/CA） by using the NS-2 software was use to analyze the cumulative distribution functions （CDF） and the probability density functions （PDF）for interference under the mode＇ s of PPP, RWP, GM and RPG. It was found that the performance of wireless ad-hoc networks was gleaty degraded by the co-channel interference, since the interference at a receiver crucially depends on the distribution of interfering transmitters ; the PPP based interference distribution characteristics were similar to that under the random waypoint model, but very different from that under the other two mobile models. The reasons for the differences were finally analyzed.

关 键 词：移动自组网 干扰分布 泊松点过程(PPP) 移动模型 NS-2仿真 

分 类 号：TN929.5[电子电信—通信与信息系统]