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Rate Control for Robust Video Transmission over Burst-Error Wireless Channels(IEEE)

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Rate Control for Robust Video Transmission over Burst-Error Wireless Channels(IEEE)

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WIRELESS channels are increasingly being considered as a transport medium for various types of multimedia information. While the appeal of tetherless mobility is great, numerous issues need to be resolved in order for wireless transport of real time multimedia data to become a reality (including communications issues, low power implementation, etc.) We consider a scenario where, due to the user’s mobility, the channel behavior will be inherently time-varying, with periods of correct transmission alternating with periods of high error rates. In this paper, we concentrate on how a real time video application can be supported over such a time varying burst-error channel, rather than on the specifics of the physical layer of the channel. We will only assume that the channel behavior can be characterized by simple burst-error models and will provide experimental results for two such models [1], [2]. However, the proposed techniques are applicable to more general cases. In particular, our goal is not to validate specific channel models but rather to show how, given such channel models, optimized rate control strategies can be implemented. Thus, our techniques could be applied with alternative channel models for the same wireless environments considered, or they could be used, with appropriate models, for other time-varying channel scenarios. Therefore, the performance of the described techniques will depend in part on how well the channel model matches the actual channel behavior.

Transmission of real time video is challenging because of the delay constraints involved (i.e., information which arrives too late at the decoder is considered lost), and because of the negative impact of channel losses on the perceptual quality of video at the decoder. Thus to achieve high fidelity video quality at the decoder requires a robust transmission scheme [3]. Indeed, uncorrected channel errors may result in significant quality degradation at the decoder. This is particularly evident in standard coders, such as those based on MPEG or H.263, where variable length coding is used (the variable length decoder is likely to lose synchronization) or where compression involves a predictive coding scheme, such as motion compensation (error can therefore propagate through several frames). While numerous approaches for error concealment have been described in the literature [4], it is in general preferable to ensure as error-free a transmission as possible. To provide the required protection one can use error control techniques, which can be roughly categorized into open loop [e.g., forward error correction (FEC)] and closed loop [e.g., automatic repeat request (ARQ)]. Obviously error correction comes at the cost of reduced bandwidth available for transmission: this is due to the error correction overhead in the FEC case and to the need to retransmit data in the ARQ case. While FEC is often used for wireless mobile channels [5], [6], in a two-way communication system the available feedback channel can be used for error resilience by allowing the receiver to request the retransmission of erroneous packets Transmission of real time video is challenging because of the delay constraints involved (i.e., information which arrives too late at the decoder is considered lost), and because of the negative impact of channel losses on the perceptual quality of video at the decoder. Thus to achieve high fidelity video quality at the decoder requires a robust transmission scheme [3]. Indeed, uncorrected channel errors may result in significant quality degradation at the decoder. This is particularly evident in standard coders, such as those based on MPEG or H.263, where variable length coding is used (the variable length decoder is likely to lose synchronization) or where compression involves a predictive coding scheme, such as motion compensation (error can therefore propagate through several frames). While numerous approaches for error concealment have been described in the literature [4], it is in general preferable to ensure as error-free a transmission as possible. To provide the required protection one can use error control techniques, which can be roughly categorized into open loop [e.g., forward error correction (FEC)] and closed loop [e.g., automatic repeat request (ARQ)]. Obviously error correction comes at the cost of reduced bandwidth available for transmission: this is due to the error correction overhead in the FEC case and to the need to retransmit data in the ARQ case. While FEC is often used for wireless mobile channels [5], [6], in a two-way communication system the available feedback channel can be used for error resilience by allowing the receiver to request the retransmission of erroneous packets

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