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On the Multiple Access Channel With Asynchronous Cognition

机译：具有异步认知的多路访问信道

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In this paper, we introduce the two-user asynchronous cognitive multiple access channel (ACMAC). This channel model includes two transmitters, an uninformed one and an informed one, which knows prior to the beginning of a transmission the message which the uninformed transmitter is about to send. We assume that the channel from the uninformed transmitter to the receiver suffers a fixed but unknown delay. We further introduce a modified model, referred to as the asynchronous codeword cognitive multiple access channel (ACC-MAC), which differs from the ACMAC in that the informed user knows the signal that is to be transmitted by the other user, rather than the message that it is about to transmit. We state inner and outer bounds on the ACMAC and the ACC-MAC capacity regions, and we specialize the results to the Gaussian case. Furthermore, we characterize the capacity regions of these channels in terms of multi-letter expressions. Finally, we provide an example that instantiates the difference between message side-information and codeword side-information.
机译：在本文中，我们介绍了两用户异步认知多路访问通道（ACMAC）。该信道模型包括两个发送器，一个是未通知的发送器，另一个是被通知的发送器，它们在传输开始之前就知道未通知的发送器将要发送的消息。我们假设从不通知发送器到接收器的信道遭受固定但未知的延迟。我们进一步介绍了一种改进的模型，称为异步码字认知多路访问通道（ACC-MAC），它与ACMAC的不同之处在于，被告知的用户知道将由另一用户发送的信号，而不是消息。它即将传输。我们说明了ACMAC和ACC-MAC容量区域的内边界和外边界，并将结果专门用于高斯情况。此外，我们通过多字母表达来表征这些通道的容量区域。最后，我们提供了一个实例化消息边信息和码字边信息之间差异的示例。

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