Video surveillance access methods developed from wired to wireless is an inevitable trend. Wireless transmission of video images break the unfavorable situation of the traditional coaxial and fiber optic video surveillance subjected to hardware, show up more flexibility and convenience, wireless network-based video surveillance system came into being. Wireless video transmission technology had a profound impact on wireless mobile network architecture and protocols, but it also comes with the problems of limited bandwidth resources of wireless channel, signal interferences, and the large amount of video data, higher real-time requirements etc.
    Development status of wireless video transmission technology:
    With the development of information society, demands for security monitoring are increasing. In addition to focus on party and government organs, institutions and enterprises; the sea, mountains, mines, basements and other complex environments where can not be set up wired network, but need to implement security video surveillance, in this way, it requires the application of wireless video transmission technology.
    Currently, most of the wireless video transmission technologies used on the market are GPRS and CDMA technology. However, GPRS transmission bandwidth is insufficient, only a few frames per second of video, and it is prone to break and appear blind receiving spots in emergency events. CDMA transmission also exists such a defect, the downstream bandwidth is 153 kb / s, upstream bandwidth is 70 ~ 80 kb / s, and thus smooth video transmission is essentially impossible. Because only a few image frames, transferred by the form of capturing images, and for the small screen size, obviously, this does not meet the applications of real-time video surveillance system. For the solutions of microwave (digital microwave, spread spectrum microwave), wireless local area network (WLAN, 802.11 (ab, g)) technologies and other high wireless transmission, it mainly uses MPEG-2 / 4, H.264 to achieve video encoding. But most of them share common problems that only apply the visual transmission, directional transmission, and difficult to support mobile transmission, thus limit the application in video surveillance systems.