| With the rapid development of wireless LAN and maturity of codec technology, the applications of wireless multimedia spread extensively, and wireless projection technology is promoted greatly, which has become an indispensable part of daily work and life. The conventional projection techniques are connected through a wired way, which causes more cumbersome problems, such as pluging in and unpluging cable repeatedly. However, the advent and development of WLAN Display standard technology facilitates mobile terminals and smart furniture to share information, and promotes the development of wireless projection products, and the technology has become one of ―Ministry of Industry and Information Technology Broadband Wireless IP Standard Working Group‖ of the standard Projects. By analyzing the existing wireless projection technologies and applications, an improved algorithm is proposed, which promotes wireless audio and video transmission quality of service(Q uality of Service, QoS). By combining WLAN Display technology, an embedded-based wireless projection sharing system is designed and implemented.Firstly, the deep research on WLAN Display technology standards has done, and H.264 encoding compression technology and RTP/RTCP Real- time Transport Protocol features are analyzed.O n the basis of existing transmission control strategy, an improved adaptive real-time streaming media transmission strategy is proposed, which can predict through the network status based on the time delay jitter and effectively improve video transmission QoS.Secondly, on the basis of WLAN Direct techniques, the bottom of the WLAN standard Display, a wireless projector sharing system is designed, including building WLAN Direct network environment, the source data acquisition and decoding and QoS control algorithm applications.Finally, make actual performance tests to the application system, whose main goal is to verify if the system is feasible and optimal through the network throughput, response time, simulation experiment and the actual operation effect. |
