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arXiv 1202.1209cs.ITmath.IT
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状态相关MAC的Wyner-Ziv型与噪声网络编码

Wyner-Ziv Type Versus Noisy Network Coding For a State-Dependent MAC

Abdellatif Zaidi, Pablo Piantanida, Shlomo Shamai

摘要:

我们考虑一个两个用户的状态相关的多址信道中,信道的状态是已知的非因果关系的编码器之一,只有严格因果关系的其他编码器。两个编码器都发送一个公共消息,此外,知道状态的编码器非因果地发送一个单独的消息。我们发现明确的特征的容量区域的离散无记忆和无记忆高斯的情况下,这种通信模型。分析还揭示了最佳的方式,利用知识的状态,只有严格因果关系的编码器,只发送共同的消息时,这样的知识是有益的。编码器协作以向解码器传达状态的有损版本,除了通过广义的Gel'fand-Pinsker分箱来传输信息消息之外。在这个问题中特别重要的是1)执行状态压缩的最佳方式和2)压缩索引是否应该被唯一地解码的问题。我们表明,这两个压缩la嘈杂的网络编码,即,没有装仓,使用Wyner-Ziv装仓的压缩是最佳的。使用Wyner-Ziv分仓的方案与Cover和El Gamal原始压缩和转发共享元素,但与其不同之处主要在于采用后向解码而不是前向解码,并且压缩索引不是唯一解码的。最后,通过探索我们的外边界的属性,我们表明,虽然不需要在一般情况下,压缩索引实际上可以被唯一解码基本上不改变容量区域,但在牺牲较大的字母大小的辅助随机变量。

英文摘要:

We consider a two-user state-dependent multiaccess channel in which the states of the channel are known non-causally to one of the encoders and only strictly causally to the other encoder. Both encoders transmit a common message and, in addition, the encoder that knows the states non-causally transmits an individual message. We find explicit characterizations of the capacity region of this communication model in both discrete memoryless and memoryless Gaussian cases. The analysis also reveals optimal ways of exploiting the knowledge of the state only strictly causally at the encoder that sends only the common message when such a knowledge is beneficial. The encoders collaborate to convey to the decoder a lossy version of the state, in addition to transmitting the information messages through a generalized Gel'fand-Pinsker binning. Particularly important in this problem are the questions of 1) optimal ways of performing the state compression and 2) whether or not the compression indices should be decoded uniquely. We show that both compression à-la noisy network coding, i.e., with no binning, and compression using Wyner-Ziv binning are optimal. The scheme that uses Wyner-Ziv binning shares elements with Cover and El Gamal original compress-and-forward, but differs from it mainly in that backward decoding is employed instead of forward decoding and the compression indices are not decoded uniquely. Finally, by exploring the properties of our outer bound, we show that, although not required in general, the compression indices can in fact be decoded uniquely essentially without altering the capacity region, but at the expense of larger alphabets sizes for the auxiliary random variables.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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