Research On Wireless Anti-jamming In Cabin Based On 802.11AC

With the development of wireless communication,where it has the ability to change the channel of communication adaptively plays an important role in reliable wireless communication,therefore,it's very important to study the electromagnetic environment and the spectrum decision.This topic comes from mentor's project,focusing on the design of wireless communication system in airtight cabin,which has the advantages of anti-jamming interference,adaptive routing path,microminiaturization and so on.The paper firstly analyzes the system in general,proposed the architecture of antijamming wireless communication in airtight cabin,subdivided the system into software radio design and wireless digital transmission design depending on functional requirements and indicators of the system,and made device selection introduction and theoretical introduction.The software radio design and implement part,builded the gnuradio platform,designed the module of spectrum serial scanning to the question of wireless communication bandwidth is wider than the max bandwidth of USRP,in order to ensure coveraging all wireless channels.Then it discussed the spectrum sensing methodologies,including the selection of window function in the process of spectrum sensing,argument of energy detection algorithm,the threshold value adjustment in the process of spectrum decision according to the simulation of false alarm probability and detection probability,and the performance of USRP E312,changing wireless channel while it's value higher than threshold value in period of compare to resist electromagnetic interference.The wireless communication design and implement part,builded the Openwrt platform,programed bootloader for flash,compiled and transplanted Openwrt firmware based on AR9331,set up mesh network,designed the function of routing transit,designed the communication protocol for software radio interaction,in order to relize the function of channel switch automatically.Finally,the function of networking capabilities of 802.11 ac,spectrum sensing,spectral data analysis,electromagnetic interference resistance are tested and analyzed,and the results of test achieved the desired results.