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中文摘要：
AdHoc网络的频繁变化和节点的移动使得单路径协议的性能受到很大限制。由于多径路由具有稳定和网络资源利用率高的特性，它比原来的单径路由更适合于无线多跳网络。基于跨层设计的思想，提出一种按需多径路由算法QAOMDV。该算法通过节点最短队列长度，把网络层、MAC层和物理层协同起来。在与原有的路由协议的性能进行全面比较的基础上，用NS2仿真工具对改进的算法进行了性能分析和评价，结果表明该改进协议在性能上优于原有路由协议。
英文摘要：
Because ofnodes mobility and topology variability, single path routing protocols have many limitations for Ad Hoc networks. Research shows that multi-path routing in wireless multi-hop networks is more stability and efficient than single path routing. In this work, a cross-layer based Ad Hoc on-demand multi-path routing algorithm QAOMDV is proposed. It is based on the shortest queue length of nodes and designed by crossing network layer, MAC layer and physical layer. On the foundation of comparing the existing algorithms, NS2 is used to analyze their performance. The study shows that the new algorithms are more efficient.
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