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arXiv cs/0607102cs.ITmath.IT
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具有独立信息和状态已知的多址信道

Multiaccess Channels with State Known to Some Encoders and Independent Messages

Shiva Prasad Kotagiri, J. Nicholas Laneman

摘要:

我们考虑一个状态相关的多址信道(MAC)的状态非因果已知的一些编码器。我们推导出一般离散无记忆情况下的容量区域的内界,并专门针对二进制无噪声的情况。在最大熵信道状态的情况下,我们得到的容量区域的二进制无噪声MAC与一个知情的编码器推导出一个非平凡的外边界的情况下。对于一个高斯状态依赖的MAC与一个编码器被告知的信道状态,我们提出了一个内界通过应用稍微广义脏纸编码(GDPC)在通知编码器,允许部分状态取消,和一个平凡的外界通过提供信道状态的解码器也。不知情的编码器受益于状态消除方面的可实现的速率,然而,似乎GDPC不能完全消除信道状态的可实现的速率区域的影响,在所有编码器被告知的情况下。在无限状态方差的情况下,我们分析了不知情的编码器如何受益于知情的编码器的行动使用内界,也提供了一个非平凡的外界这种情况下,这是优于平凡的外界。

英文摘要:

We consider a state-dependent multiaccess channel (MAC) with state non-causally known to some encoders. We derive an inner bound for the capacity region in the general discrete memoryless case and specialize to a binary noiseless case. In the case of maximum entropy channel state, we obtain the capacity region for binary noiseless MAC with one informed encoder by deriving a non-trivial outer bound for this case. For a Gaussian state-dependent MAC with one encoder being informed of the channel state, we present an inner bound by applying a slightly generalized dirty paper coding (GDPC) at the informed encoder that allows for partial state cancellation, and a trivial outer bound by providing channel state to the decoder also. The uninformed encoders benefit from the state cancellation in terms of achievable rates, however, appears that GDPC cannot completely eliminate the effect of the channel state on the achievable rate region, in contrast to the case of all encoders being informed. In the case of infinite state variance, we analyze how the uninformed encoder benefits from the informed encoder's actions using the inner bound and also provide a non-trivial outer bound for this case which is better than the trivial outer bound.

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