In this work, in order to achieve higher spectrum efficiency, we propose a reconfigurable intelligent surface (RIS)-assisted multi-user communication uplink system. Different from previous work in which the RIS only optimizes the phase of the incident users's signal, we propose the use of the RIS to create a virtual constellation diagram to transmit the data of an additional user signal. We focus on the two-user case and develop a tight approximation for the cumulative distribution function (CDF) of the received signal-to-noise ratio of both users. Then, based on the proposed statistical distribution, we derive the analytical expressions of the average bit error rate of the considered two users. The paper shows the trade off between the performance of the two users against each other as a function of the proposed phase shift at the RIS.

中文翻译：

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一种新颖的 RIS 辅助调制方案

在这项工作中，为了实现更高的频谱效率，我们提出了一种可重构智能表面（RIS）辅助多用户通信上行链路系统。与之前的工作中 RIS 仅优化事件用户信号的相位不同，我们建议使用 RIS 创建虚拟星座图来传输附加用户信号的数据。我们专注于两个用户的情况，并开发了两个用户接收到的信噪比的累积分布函数 (CDF) 的严格近似。然后，基于所提出的统计分布，我们推导出所考虑的两个用户的平均误码率的解析表达式。该论文展示了两个用户的性能之间的权衡，作为在 RIS 上提出的相移的函数。