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Zero-Delay and Causal Single-User and Multi-User Lossy Source Coding with Decoder Side Information

机译:具有解码器侧信息的零延迟和因果关系单用户和多用户有损源编码

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摘要

We consider zero-delay, single-user, and multi-user source coding with an average distortion constraint and decoder side information. The zero-delay constraint translates into causal (sequential) encoder and decoder pairs as well as the use of instantaneous codes. For the single-user setting, we show that optimal performance is attained by time sharing at most two scalar encoder–decoder pairs, that use zero-error side information codes. Side information look-ahead is shown to be useless in this setting. Furthermore, we show that even without delay constraints, if either the encoder or decoder are restricted to be scalar, the performance loss cannot be compensated by the other component, which can be scalar as well without further loss. Finally, we show that the multi-terminal source coding problem can be solved in the zero-delay regime and the rate-distortion region is provided.
机译:我们考虑具有平均失真约束和解码器辅助信息的零延迟,单用户和多用户源编码。零延迟约束转化为因果(顺序)编码器和解码器对,以及瞬时代码的使用。对于单用户设置,我们证明了通过在最多两个使用零错误辅助信息码的标量编码器/解码器对中分时实现最佳性能。在此设置中,预示辅助信息无用。此外,我们表明,即使没有延迟约束,如果将编码器或解码器限制为标量,则性能损失也无法由其他组件补偿,而其他组件也可以是标量,而不会造成进一步损失。最后,我们证明了多终端源编码问题可以在零延迟体制下解决,并提供了速率失真区域。

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