Design And Implementation Of Prototype System Of Next Generation WLAN

With the rapid development of the Internet and mobile Internet,not only the use of family and enterprise WLAN network are growing rapidly,but also the telecom operators have begun to intensively develop WLAN hot spots in the public area,resulting in problems like interference,coverage and usage in the actual network environment(especially largescale and intensive network).Increasing throughput is no longer a top priority for WLAN development.How to improve the overall performance of WLAN in the networking environment,improve the quality of WLAN service and the actual user experience is the key bottleneck for WLAN development.Next-generation WLAN is an important technical direction for 5G in a variety of indoor and outdoor network deployment environment,which are designed to enhance WLAN spectrum efficiency,improve WLAN area throughput and actual performance in dense network environments.In the high-density deployment environment,the non-centrally controlled features and CSMA /CA based random multiple access protocols lead to more serious conflict and back-off,which seriously affects the performance of WLAN.Based on this,how to solve the interference problem of OBSS area in WLAN is of great significance.Firstly,we briefly introduced the development of wireless LAN and the latest 802.11 ax protocol.In this thesis,the research progress of OBSS interference management architecture is introduced for the problem of OBSS interference.We also studied the current situation of interference research in dense WLAN environment,and analyzed some methods used to solve the interference problems,which provided the basis for us to design new interference management scheme.Secondly,based on the theoretical analysis,an AC-based OBSS interference management scheme is proposed.The scheme can effectively improve the system throughput by combining channel allocation and power control.Additionally,on the basis of ZYNQ EES273 board we implemented the OBSS interference management program,including protocol algorithms and AC interface development.The content of this thesis is derived from major projects,limited to the current units have not joint debugging,and we can't give a specific performance test.In order to show the performance of the algorithm,we simulated the OBSS interference management scheme on NS3.The simulation results show that the scheme can meet the requirements of the project,which can greatly improve the interference to enhance the system throughput.Finally,we come up with a method based on multi-AP cooperative interference cancellation,which is derived from the author's invention patent.Using this method can not only solve the interference between APs but also improve the channel utilization.By analyzing the method,the system can benefit up to 50% of the system profit.