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Research On Joint Source Channel Coding, For Wireless Video Transmission

Posted on:2012-10-20Degree:MasterType:Thesis
Country:ChinaCandidate:L Y ZhongFull Text:PDF
GTID:2178330332975469Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Mobile broadband video service is the main driving force and the new growth point for the development of 3G,4G, and even the future wireless communications and personal communications, but there are many challenges. So the subject need further study. Designing an effective coding scheme is one of the key issues of the subject. However, the traditional separate coding design method often cann't achieves satisfactory results in practical applications. In recent years, joint source channel coding received wide attention at home and abroad, it has been proved to be an effective coding scheme, suitable for mobile wireless video transmission business.Firstly, the research background, trends and results are expounded. The international standards of video compression coding and common channel coding are outlined. And the application and the classification of joint source channel coding are introduced.Secondly, the characteristics of wireless channel and the problems of video transmission over wireless network are analyzed. wireless video transmission performance is simulated and analyzed over three wireless channel models respectively using H.264 standard for video compression coding and LDPC codes as channel coding techniques,.Again, the video end-to-end distortion is analysed thoroughly, after considering all these fators which affect video reconstruction quality such as quantization, packet loss, error propagation and error concealment, a video end-to-end distortion model is established, and then the simulate is performed to verify its accuracy.Finally, a joint source channel coding (JSCC) scheme based on end-to-end distortion is designed. The scheme can find out the optimized quantization parameter and channel coding rate correspondence to the minimum end-to-end distortion, under the given channel bandwidth and SNR. In this way, the encoded stream can adapt to changes better in wireless channel.The JSCC is compared to the fixed rate scheme, simulating results show that the JSCC achieve better decoding video quality than the fixed rate scheme.
Keywords/Search Tags:End-to-end distortion, Joint source channel coding, Video wireless transmission, LDPC codes
PDF Full Text Request
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