自适应对两个离散加性噪声双向信道是无用的
Adaptation is Useless for Two Discrete Additive-Noise Two-Way Channels
摘要：
在双向信道中，每个用户同时发送和接收。这允许每个编码器交互地将当前输入适配到其自己的消息和所有先前接收的信号。这种编码方法可以在不同用户的输入之间引入相关性，因为所有用户的输出通过信道的性质而相关。然而，对于某些信道，编码方案中的这种自适应及其在用户之间引起的相关性是无用的，因为它们无助于相对于标准编码方法（其中每个用户仅基于其自己的消息进行编码）扩大容量区域。在本文中，它是自适应无助于扩大两类双向离散信道的容量区域：模加性噪声信道与记忆和多址/退化广播信道。
英文摘要：
In two-way channels, each user transmits and receives at the same time. This allows each encoder to interactively adapt the current input to its own message and all previously received signals. Such coding approach can introduce correlation between inputs of different users, since all the users' outputs are correlated by the nature of the channel. However, for some channels, such adaptation in the coding scheme and its induced correlation among users are useless in the sense that they do not help enlarge the capacity region with respect to the standard coding method (where each user encodes only based on its own message). In this paper, it is shown that adaptation is not helpful for enlarging the capacity region of two classes of two-way discrete channels: the modulo additive-noise channel with memory and the multiple access/degraded broadcast channel.
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