基于H.264率失真模型的无线信源信道联合编码方案  

H.264 rate-distortion model based joint source channel coding scheme over wireless channels

作　　者：高雪娟[1] 卓力[1] 沈兰荪[1] 

机构地区：[1]北京工业大学信号与信息处理研究室,北京100022

出　　处：《通信学报》2008年第9期24-31,39,共9页Journal on Communications

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2008AA01A313);国家自然科学基金资助项目(60772069);北京市科技新星计划基金资助项目(2005B08)~~

摘　　要：针对H.264编码器的率失真特性,建立了一种新的H.264编码率失真(R-D,rate-distortion)模型;然后基于该R-D模型和Turbo码的抗差错特性,对无线环境下的端到端视频传输失真进行了深入的分析,提出了一种无线信道下的自适应视频信源信道联合编码(JSCC,joint source channel coding)方案,该方案可以自适应地根据当前无线信道的具体状况,将网络可用带宽在信道编码和信源编码之间进行最优的分配,使得端到端的传输失真达到最小。实验结果表明,与固定选择信道编码速率方案相比,该方案可以显著提高传输的可靠性,在接收端可以获得更好的视频重建质量。A new rate-distortion model of H.264 encoder was firstly set up according to the rate distortion （R-D） characteristics of H.264. Then, the end-to-end video transmission distortion was analyzed and based on the R-D model of the H.264 encoder and the error combat characteristics of the Turbo code, an adaptive joint source channel coding （JSCC） over wireless channel was proposed, which could optimize the rate allocation of the available network bandwidth between source coding and channel coding adaptively according to the actual condition of current wireless channel, so as to improve the robustness of the video transmission. The experiment results indicate that, compared with fix choice of channel coding rate, the proposed JSCC scheme is can greatly improve the transmission robustness and achieve better reconstructed video quality at the receiver.

关 键 词：信源信道联合编码 率失真模型 码率分配 端到端失真 H.264标准 TURBO码 

分 类 号：TN911.2[电子电信—通信与信息系统]