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Errors-and-Erasures Decoding for Block Codes With Feedback

机译:带反馈的块码的误码和纠错解码

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摘要

Inner and outer bounds are derived on the optimal performance of fixed-length block codes on discrete memoryless channels with feedback and errors-and-erasures decoding. First, an inner bound is derived using a two-phase encoding scheme with communication and control phases together with the optimal decoding rule for the given encoding scheme, among decoding rules that can be represented in terms of pairwise comparisons between the messages. Then, an outer bound is derived using a generalization of the straight-line bound to errors-and-erasures decoders and the optimal error-exponent tradeoff of a feedback encoder with two messages. In addition, upper and lower bounds are derived, for the optimal erasure exponent of error-free block codes in terms of the rate. Finally, a proof is provided for the fact that the optimal tradeoff between error exponents of a two-message code does not improve with feedback on discrete memoryless channels (DMCs).
机译:内边界和外边界是基于具有反馈和误码擦除解码的离散无记忆通道上固定长度分组码的最佳性能得出的。首先,在可以用消息之间的成对比较表示的解码规则中,使用具有通信和控制阶段的两阶段编码方案以及针对给定编码方案的最佳解码规则来导出内部界限。然后,使用对误差和擦除解码器的直线边界的一般化以及带有两个消息的反馈编码器的最佳误差指数折衷来导出外部边界。另外,对于速率方面无错误的块码的最佳擦除指数,导出了上限和下限。最后,提供了以下事实的证明:两个消息代码的错误指数之间的最佳权衡不会随着离散无记忆通道(DMC)上的反馈而改善。

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