H.26L視頻在WLAN上的實時編碼與傳輸研究
Study on the Real-Time Coding and Transmission of H.26L Video over WLAN
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摘要: 該文討論了視頻在WLAN上的實時編碼和傳輸問題。首先針對視頻編碼的特點，提出了一種改進的混合ARQ/FEC算法，可有效地改進傳輸?shù)膶崟r性和可靠性。然后提出了一種依據(jù)接收端的反饋信息進行參考幀選擇和幀內(nèi)更新算法，可有效地解決因時間預測編碼造成的差錯一直向后傳播問題，同時可保證編碼的高效率。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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