Design and Implementation of Wireless Video Transmission System

A real-time H.264 video stream transmission system which based on standard RFC is designed and implemented in this paper. In order to overcome the adverse factors as high bit error and low bandwidth through the wireless channel, this paper proposes UDP / RTP virtual links that under the CDMA2000 EVDO to ensure real-time transmission. At the meantime, in order to make up the lack of AIMD algorithm, this paper using Gilbert channel model to estimate the effective bandwidth, and adjust the sending rate by predicting the bandwidth. Finally the hybrid network model and NAT penetration are used to achieve the control network transparent. The results show that when the network congestion occurs, the system will automatically reduce the video frame rate to ensure real-time video transmission, since the RTCP feedback mechanism is added.