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    block this user An-Ping Li

    Research Fellow

    Beijing 100085, P.R.China

    Robust Low Bit-Rate Video Transmission Over Wireless Access Systems

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    We consider the transmission of QCIF resolution (176 Theta 144 pixels) video signals over wireless channels at transmission rates of 64 kbit/s and below. The bursty nature of the errors on the wireless channel requires careful control of transmission performance without unduly increasing the overhead for error protection. A dual-rate source coder is presented that adaptively selects a coding rate according to the current channel conditions. An ARQ (Automatic Repeat reQuest) error control technique is employed to retransmit erroneous data-frames. The source coding rate is selected based on the occupancy level of the ARQ transmission buffer. Error detection followed by retransmission results in less overhead than forward error correction for the same quality. Simulation results are provided for the statistics of the frame-error bursts of the proposed system over CDMA channels with average bit error rates of 10 Gamma3 to 10 Gamma4 . 1. INTRODUCTION This paper presents an approach...

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    Title : Robust Low Bit-Rate Video Transmission Over Wireless Access Systems
    Abstract : We consider the transmission of QCIF resolution (176 Theta 144 pixels) video signals over wireless channels at transmission rates of 64 kbit/s and below. The bursty nature of the errors on the wireless channel requires careful control of transmission performance without unduly increasing the overhead for error protection. A dual-rate source coder is presented that adaptively selects a coding rate according to the current channel conditions. An ARQ (Automatic Repeat reQuest) error control technique is employed to retransmit erroneous data-frames. The source coding rate is selected based on the occupancy level of the ARQ transmission buffer. Error detection followed by retransmission results in less overhead than forward error correction for the same quality. Simulation results are provided for the statistics of the frame-error bursts of the proposed system over CDMA channels with average bit error rates of 10 Gamma3 to 10 Gamma4 . 1. INTRODUCTION This paper presents an approach...
    Subject : unspecified
    Area : Mathematics
    Language : English
    Affiliations
    Url : http://www.inrs-telecom.uquebec.ca/users/viscom/english/publications/local/cpapers/Khan94icc.ps.gz
    Doi : 10.1.1.46.2873

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    An-Ping's Peer Evaluation activity

    Emailed by 1
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    Downloads 663
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    Full text requests 9
    Followed by 2

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