矿井WMN多媒体应急通信系统多跳传输性能改进矿井WMN多媒体应急通信系统多跳传输性能改进.doc

矿井WMN多媒体应急通信系统多跳传输性能改进 摘 要:由于矿井无线mesh网络（wmn）多媒体应急通信系统的多跳传输存在基准带宽较低、多跳传输带宽衰减率较大的问题,对其多跳传输性能进行改进。提出了一种矿井wmn多媒体应急通信系统骨干传输链路的网络结构,并建立了其传输模型,研究了对其传输性能产生影响的主要因素。提出了基于802.11n的多跳mesh骨干传输网络的多模mesh节点结构,解决了矿井wmn多媒体应急通信系统多跳传输的两个难题。实验结果表明其具有超过165mbps的基准带宽,并且在60mbps的限速应用环境下,每跳的带宽衰减小于1%,基本满足了矿井多媒体业务传输的应用需求。 关键词:802.11n; 应急通信系统; 多模;无线mesh网络; 多跳传输性能  improvement on multihop performance of  underground mine emergency communication system based on wmn  zhu quan1,2*, jiang xinhua1, zou fumin2, xu shaofeng1 ( 1.school of information science and engineering, centralsouth university, changsha hunan 410075, china; 2.research center for nextgeneration internet technology and applications, fujian university of technology, fuzhou fujian 350108, china ) abstract: the multihop transmission of multimedia emergency communication system based on wireless mesh network (wmn) in underground mine have two problems: low basis bandwidth and high multihop transmission attenuation. this paper aimed to improve the multihop transmission performance for the system. in this paper, a trunk line network structure of multimedia emergency communication system based on wmn in underground mine was proposed. the authors established its transmission model, and then had a research on the main factors that affected the transmission performance. the multiradio node structure of multihop mesh backbone network based on 802.11n was proposed and solved the two problems of multihop transmission. the experimental results show that it has more than 165mbps basis bandwidth, and under the limited 60mbps environment, the bandwidth attenuation of per hop is less than 1%, basically satisfying the application requirements of multimedia transmission in underground mine. key words: 802.11n; emergency communication system; multiradio; wireless mesh network (wmn); multihop transmission performance  0 引言 无线宽带网络，特别是无