支持AODV的嵌入式WiFi终端设计与实现

发布时间：2018-10-18 15:34

【摘要】：由于传统WiFi终端设备价格较为昂贵,仅仅支持单跳接入,因此开发一种性价比高、支持多跳的便携式WiFi终端变得至关重要。本文在研究嵌入式系统、无线接入和自组网等关键技术的基础上,设计并实现了一种支持AODV路由功能的嵌入式WiFi终端,具有实现简单、成本低、覆盖范围广等优点。论文主要完成了该终端的WiFi上网功能和AODV路由功能的设计与实现,并对各项功能进行测试,给出了测试结果。论文首先综述了嵌入式系统、无线接入和自组网等技术的研究现状及未来发展趋势,随后给出了系统设计的总体功能框架,阐述了系统软、硬件开发平台的构建,重点分析了软件编程环境搭建过程中所涉及的操作系统选择、内核裁剪以及系统移植等,在此基础上详细阐述了基于ARM11开发平台的WiFi终端上网功能和AODV路由功能的具体实现。(1)将处理器为三星公司S3C6410的ARM11作为开发平台,移植具有图形界面的嵌入式Linux操作系统,在此之上通过研究无线网卡驱动、移植无线工具集命令,实现了无线网卡的正确启动。同时,利用智能手机虚拟出局域网接入点ZTE_AP_3974,通过Linux下的无线网卡字符命令操作实现局域网接入和上网功能。(2)在加载网卡驱动的嵌入式节点上,通过设置网卡模式生成Ad Hoc网络,并移植具有屏蔽节点MAC地址功能的iptables;接着分析研究AODV路由协议,通过添加包过滤框架Netfilter函数支持、修改路由源码、交叉编译,实现AODV协议在嵌入式平台上的移植；随后编写服务器、客户端socket网络程序,实现了具有AODV路由功能的mini-telnet程序。最后,论文对所开发的嵌入式WiFi终端的功能进行了测试,测试结果表明系统运行正常,达到了预期效果。
[Abstract]:Because the traditional WiFi terminal is expensive and only supports single-hop access, it is very important to develop a portable WiFi terminal with high performance and price ratio. Based on the research on the key technologies of embedded system, wireless access and ad hoc network, this paper designs and implements an embedded WiFi terminal which supports the AODV routing function. It has the advantages of simple implementation, low cost and wide coverage. This paper mainly completes the design and implementation of the WiFi Internet access function and AODV routing function of the terminal, and tests each function, and gives the test results. The selection of operating system, kernel tailoring and system transplanting are analyzed in the process of setting up software programming environment. On this basis, the implementation of WiFi terminal access function and AODV routing function based on ARM11 development platform is described in detail. (1) the embedded Linux operating system with graphical interface is transplanted with the ARM11 of Samsung S3C6410 as the development platform. On this basis, the wireless network card driver is studied and the commands of wireless tool set are transplanted to realize the correct start of wireless network card. At the same time, using the smart phone virtual LAN access point ZTE_AP_3974, to realize the LAN access and Internet access function through the Linux wireless card character command operation. (2) on the embedded node loaded with the Nic driver, the Ad Hoc network is generated by setting the network card mode. Then the iptables; which has the function of shielding node MAC address is transplanted. Then the AODV routing protocol is analyzed and studied. By adding the Netfilter function support of packet filtering framework, modifying the route source code, cross-compiling, realizing the transplant of AODV protocol on embedded platform; Then write the server, client socket network program, the realization of AODV routing function of the mini-telnet program. Finally, the function of the embedded WiFi terminal is tested, and the test results show that the system runs normally and achieves the desired effect.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN92

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