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An Adaptive Unequal Error Proctection Mechanism for H.264 Video Transmission in Wireless Networks

Author: LongShuBing
Tutor: ZhaoZheng
School: Tianjin University
Course: Applied Computer Technology
Keywords: Wireless Network Video transmission Joint source-channel coding Unequal Error Protection H.264
CLC: TN919.8
Type: Master's thesis
Year: 2007
Downloads: 101
Quote: 1
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Abstract


With the rapid development of wireless networks , the increasingly strong demand for anytime, anywhere video transmission . The limited bandwidth of wireless networks and fluctuations, error rate , and video transmission network bandwidth and latency video transmission in a wireless network faces enormous challenges . The new video coding standard H.264 encoding technology -oriented network transport to be considered , but only from the source coding and can not achieve the overall transmission performance optimal joint source channel coding is a balanced video transmission efficiency and quality effectively solutions. In this paper, the changing characteristics of the wireless network bandwidth fluctuations and packet loss rate , combined with H.264 data partitioning features, a new adaptive joint source channel coding unequal error protection (UEP, Unequal Error Protection) mechanism . The mechanism first for H.264 stream P frame to establish a joint source channel RD (Rate Distortion) model to solve the problem of optimal allocation of P frame source and channel coding bits . Then the data in the P-frame segmentation A package RS ( Reed - Solomon ) encoding on the data division B / C repeat packets encoded . The mechanism can be provided according to different fluctuations in bandwidth , packet loss rate change and the video input signal , calculated in real time the source coding QP (Quantization Parameter) values ??and channel encoded RS coding strength and repeat packets coding strength , so to the radio network Video Transmission adaptive Optimization . In this paper, the representation of video sequences , different bandwidth and packet loss rate under the conditions of the RD model with the actual values ??are compared to verify the accuracy of the model of the RD . Multiple sets of Wireless Network Simulation results show that the adaptive UEP mechanism , the video stream fluctuations scene adaptive ability , the the video receiving end average PSNR (Peak Signal-to-Noise Ratio) value less any protection scheme an increase of about 6 -10dB .

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