Research On Wireless Multiple Access Protocol Based On Embedded Operating System

The wireless local area network(Wireless LAN,WLAN), is a data communication system to provide the connection point to point and equal entity to equal entity through wireless medium. At present there are many kinds of WLAN standard, thereinto IEEE 802.11 standard is used most widely.The WLAN protocol IEEE 802.11 has two kinds of basic access ways - DCF(distributional coordination control function) and PCF(centralism coordination control function). In the thesis, we have a systematical and thorough analysis on DCF which based on CSMA/CA(carry sense detected of multiple access of collision avoid) technology and study the carrier sense, random backoff mechanism, channel access control etc. According to the modular design process, we design the MAC layer protocol software, divide the entire protocol function into five function modules, introduce the function of three blocks of them in detail, and design the specific program of three blocks.And then, we build the hardware and software platform for the realization of the protocol based on the achievement of MAC layer protocol through software programming, accomplish the transplant of the embedded operating systemμC/OS-II in the ARM7 processor as a MAC protocol software running environment. Finally, we describe a new MAC layer protocol based on cooperative communication -CMAC (Cooperative Communication MAC) protocol.