Optimized Transmission Of Wireless Video Based On IEEE 802.11ax

With the rapid development of wireless communication technology,the proportion of wireless video transmission service in communication service is increasing gradually.People show great demand for it,but also put forward higher requirements.Wireless video transmission is more and more widely used in people's work,entertainment and daily life.It is also of great value to national security and urban construction.However,the current wireless video transmission technology is far from meeting people's needs,so how to use the limited resources of wireless networks to provide high-quality video services has become an urgent problem to be solved.Video information has the characteristics of large amount of data and high real-time requirement.In order to transmit large amount of video information in wireless channel with limited resources,it is necessary to compress and encode video data effectively,remove redundancy and improve transmission efficiency.In order to combat the high bit error rate of wireless channel,channel coding must be added to increase redundancy and improve transmission reliability.The main purpose of this paper is to find a balance between efficiency and reliability and improve the performance of wireless video transmission.This paper first outlines the wireless communication standard protocol IEEE802.11 ax and its development trend,then introduces the system structure and problems of wireless video transmission,as well as the key technologies of existing wireless video transmission,including unequal error protection mechanism(UEP),hybrid automatic repeat(HARQ)mechanism,full duplex and so on.On this basis,the joint transmission of source and channel based on the unequal importance of video content is optimized.According to unequal error protection mechanism and the unequal importance of video content,a frame queue managementmechanism is proposed.Combining with HARQ technology,the scheme of wireless video transmission is optimized and verified by simulation.In addition,based on the latest development trend of wireless communication,an optimization mechanism of wireless video transmission efficiency based on traffic control is proposed for EHT(Extremely High Throughput)users in the case of full duplex with different frequencies,and the feasibility of the scheme is verified by simulation experiments.