Abstract: Mobile Ad hoc Network（MANET） is a mobile, multihop wireless network in which effective routing algorithm is critical. Because of the mobility of Ad hoc network, the active route of Ad hoc On-demand Multipath Distance Vector Routing（AOMDV） is no longer the shortest routing. An improved approach to the mentioned deficiencies is proposed：two-hop route is constructed and then the two-hop route information is used to optimize the active route dynamically, making the route distance more shorter. NS-2 simulation results indicate that the improved AOMDV can obtain lower route discovery frequency, lower end-to-end average delay, smaller normalized routing load and more packet delivery ratio than those of the AOMDV.

Key words: Mobile Ad hoc Network, routing algorithm, Ad hoc On-demand Multipath Distance Vector Routing（AOMDV）, NS-2 simulation

摘要： 移动无线自组网是一种移动多跳无线网络，有效的路由算法是关键。由于移动自组网的移动性，会使得无线自组网按需多径距离矢量路由（AOMDV）协议的活动路由不再是最短路径。针对此不足，提出了改进方法：构建两跳路由，然后利用两跳路由信息对活动路由进行动态优化，使路径更短。NS-2仿真结果表明，改进的AOMDV协议在路由发起频率、端到端平均时延、归一化路由开销和数据分组投递率等方面的性能均比AOMDV效果好。

关键词: 移动无线自组网（MANET）, 路由算法, 无线自组网按需多径距离矢量路由, NS-2仿真