For video communications over wireless ad-hoc networks, there are fundamentally two different kinds of packet losses: packet losses due to channel over-pumping, where the operating transmission rate is higher than the prevailing channel capacity, and packet losses due to transmission errors. To eliminate the first kind of packet losses, rate-control is necessary in order to adapt to the time-varying channel capacity. For the second kind of packet losses, error-resilient coding techniques should be used. In this paper, we propose a cross-layer rate-control scheme based on an analytical study of how the effective video transmission rate is affected by the prevailing operating parameters. Furthermore, in order to provide error-resilient real-time video delivery over such wireless ad-hoc networks, a cross-layer delay-constrained joint source-channel coding (JSCC) approach, to be used in conjunction with rate-control, is proposed and investigated. Simulation results demonstrate the effectiveness of this combination of cross-layer rate-control and delay-constrained JSCC for supporting error-resilient video delivery over wireless ad-hoc networks operating under a delay constraint.


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    Title :

    Cross-layer design for delay-constrained error-resilient video communications over wireless ad-hoc networks


    Contributors:
    Qi Qu, (author) / Yong Pel, (author) / Modestino, J.W. (author) / Xusheng Tian, (author) / Bin Wang, (author)


    Publication date :

    2005-01-01


    Size :

    227700 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English