Research And Implementation Of Information Transmission Technology In Wireless Multi-hop Networks Based On Wi-Fi

The mutual communication between the various requirements are put forward under the background of the rapidly development of the Internet.Wi-Fi Direct technology was presented by Wi-Fi League and developed based on Wi-Fi,which can realized the short distance communication between two or more users not by existed network infrastructure.However the equipment of Wi-Fi Direct cannot undertake long distance communication limited by the technology of the Wi-Fi,users need to use the wireless Mesh network if a long distance communication is required.Mesh wireless network was essentially an Ad Hoc network,which used multi-point topology to meet between remote user multi-hop communicate needs.Notable characteristics of these two technologies could be implemented without the infrastructure network real-time communication between the users.we mainly study and implement the instant communication of the two technical modes in this paper,The main contents are as follows:Firstly we are aiming at short-range wireless communications,designed and implemented a real-time communication system based on the Wi-Fi Direct.We have to hierarchical and modular designed the system according to the functional requirements,user interface layer,business logic,communication layer and device driver layer are included,modular structure of the Wi-Fi Direct module are constructed by Socket Communications module and instant messaging module.The Wi-Fi Direct completed equipment the function of search and connection;Socket communication module was to provide basic services by creating a socket for the instant messaging;Instant communication module was mainly to realize real-time information transmission between users.Then we realize the instant communication between users by a functional test of our system.Secondly devote our mind to long distance wireless communication,designed and implemented a real-time communication system based on wireless Mesh network.We have to set up wireless Mesh network to complete the function of communication because of Wi-Fi Direct technology could not meet the requirement of the communication give rise to a longer distance.We will give a brief description of Mesh network architecture and routing protocol classification and give a deeper research on principle of OLSR routing protocol,three control information repository were studied and analyzed emphatically.Then explained the deployed in the openwrt OLSR routing protocol implementation method in detail and successfully set up wireless Mesh network and realized the Mesh based on Wi-Fi wireless multiple hops network communication.