The two-user multiple-access relay channel (MARC) is investigated in the presence of side information (SI) available only at the informed transmitter in the present article. First, for the discrete alphabet and memoryless MARC with common and private messages, partial decode and forward strategy at the relay and fixed locations of the nodes, a general achievable rate region is obtained. The SI effect is seen and can be analyzed. Second, we extend the discrete result to a practical communications model: Gaussian multiple-access relay channel (GMARC), showing previous works as its special cases. Third, the effect of (perfect and nonperfect) SI on the maximum coverage region of GMARC for a fixed rate of the transmitters and a fixed distance between relay and destination is analyzed. It is shown that the SI increases the coverage region of encoders, and consequently, it can improve communication energy efficiency. Finally, mathematical findings are validated numerically by using Matlab.

中文翻译：

---

一个编码器的中继和边信息对高斯多址信道覆盖区域的影响

在本文中，在存在仅在通知发射机处可用的边信息 (SI) 的情况下，研究了双用户多址中继信道 (MARC)。首先，对于具有公共和私人消息的离散字母表和无记忆MARC，在中继和节点固定位置处的部分解码和转发策略，获得了一般可实现的速率区域。可以看到 SI 效应并对其进行分析。其次，我们将离散结果扩展到一个实用的通信模型：高斯多址中继信道（GMARC），将以前的工作显示为它的特例。第三，分析了（完美和非完美）SI 对 GMARC 最大覆盖区域的影响，发射机速率固定，中继和目的地之间的距离固定。结果表明，SI 增加了编码器的覆盖区域，因此，它可以提高通信能源效率。最后，数学发现通过使用 Matlab 进行了数值验证。