Video data wireless transmission method based on cross-layer bitrate adaptation and error control

Abstract

Aiming at the difficulty of video data transmission in wireless transmission, the idea of cross-layer design is taken as the main line, and the wireless transmission method of video data based on cross-layer code rate adaptation and error control is studied. The MAC layer rate adaptation technology, application layer video codec technology and its rate control technology, transport layer data transmission protocol and its packet encapsulation strategy are studied. The design of video transmission system based on cross-layer design is realized. Aiming at the RTP transmission of H.264 video stream, this paper studies the RTP packet encapsulation mode of H.264 data, and implements an adaptive packet encapsulation strategy based on MAC layer channel quality estimation. Aiming at the RTP transmission of H.264 video stream, the RTP packet encapsulation mode of H.264 data is studied. The adaptive packet encapsulation strategy is implemented based on the MAC layer channel quality estimation. The performance test of the proposed rate control strategy and packet encapsulation strategy is carried out in the actual test environment, and compared with the existing methods. The results show that the proposed strategy is in the case of long communication distance or node movement. The proposed method can reduce the header overhead by 50% and barely 50% of the throughput, and the performance in terms of video playback quality and image PSNR is better than the existing strategy.