H.26L视频在WLAN上的实时编码与传输研究
Study on the Real-Time Coding and Transmission of H.26L Video over WLAN
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摘要: 该文讨论了视频在WLAN上的实时编码和传输问题。首先针对视频编码的特点，提出了一种改进的混合ARQ/FEC算法，可有效地改进传输的实时性和可靠性。然后提出了一种依据接收端的反馈信息进行参考帧选择和帧内更新算法，可有效地解决因时间预测编码造成的差错一直向后传播问题，同时可保证编码的高效率。Abstract: The issue of real-time coding and transmission of video over WLAN is discussed in this paper. First, a modified hybrid ARQ/FEC algorithm, based on the characteristic of video coding, which improves the performance of video transmission, is proposed. To prevent the temporal error propagation, an error resilient video algorithm, with select intact reference frames or intra coding according to the backward channel signaling, is proposed as well.
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[1] ［1］IEEE 802.11-1999 Standards for Information Technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-specific requirements-Part 11:Wireless LAN medium access control (MAC) and physical layer (PHY) specifications [S]. [2] Liao J Y,Villasenor J.Adaptive intra block update for robust transmission of H[J].263.IEEE Trans.Circuits Syst.Video Technol.2000,10(1):30-35 [3] JM5.0C,ftp://ftp.imtc-files.org/jvt-experts [4] Majumdar A,Sachs D G,Kozintsev I,Ramchandran R,Yeung M.Multicast and unicast real-time video streaming over wireless LANs[J].IEEE Trans.Circuits Syst.Video Technol.2002,12(6):524-534 [5] Rizzo L.Effective erasure codes for reliable computer communication protocols[J].ACM Computer Communication Review.1997,27(2):24-36 -
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