一种新颖的无线OFDM信道H．264／AVC视频传输技术  

Novel transmission method for H.264/AVC video data over wireless OFDM channels

作　　者：马彦卓[1] 常义林[1] 姚峻[2] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071 [2]华为技术有限公司PSMT预研部,广东深圳518129

出　　处：《西安电子科技大学学报》2008年第3期395-402,473,共9页Journal of Xidian University

基　　金：国家自然科学基金资助(60772134);西安电子科技大学华为多媒体通信联合实验室专项资助(YZCB2007001)

摘　　要：提出一种空间域频域时间域三重数据交织的无线OFDM视频传输新方法.空间域交织将视频数据在图像空间域的突发误码均匀化;相邻OFDM子信道交织传送视频slice,即频域交织,有利于时间和空间的错误掩盖技术的实现;同一OFDM子信道在时间上交织传送不同序号的slice信息,即时间域交织,能提供可靠的参考帧进行帧间预测编码,防止帧间误码扩散,同时也有利于误码掩盖技术的实现.将以上的三重交织技术和反馈的多参考帧选择技术以及错误掩盖技术结合起来构成视频传输系统,能有效地提高视频通信的抗误码能力.仿真结果表明,在不同信道条件下,提出的方法能使OFDM无线信道上传输后恢复视频的PSNR提高4 dB以上.A novel three-dimension data interleaving method is proposed for video data transmission over wireless OFDM channels, where the three-dimensional interleaving includes interleavings in the spatial domain, frequency domain and temporal domain. The interleaving in the spatial domain is to uniformly disperse the burst bit-errors over the picture area. The frequency domain interleaving is to transmit adjacent slices over spaced sub-channels, which facilitates temporal or spatial error concealment. Temporal interleaving is to transport different slices in one OFDM sub-carrier in changed time intervals. It can provide credible reference picture for inter-frame prediction coding, and thus the error propagation over frames can be avoided, and the error concealment can be exploited too. System integrating the three-dimension data interleaving method with the multi-reference picture selection （RPS） and error concealment can efficiently improve the quality of the reconstructed video transmitted over wireless OFDM channels. Simulation results show that the proposed method can increase the PSNR of reconstructed video transmitted over OFDM wireless channels by over 4dB under different channel conditions.

关 键 词：视频传输 三重交织 防止误码扩散 OFDM无线信道 错误掩盖 

分 类 号：TN919[电子电信—通信与信息系统]