This paper investigates a reconfigurable intelligent surface (RIS)-aided wideband massive multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with low-resolution analog-to-digital converters (ADCs). Frequency-selective Rician fading channels are considered, and the OFDM data transmission process is presented in time domain. This paper derives the closed-form approximate expression of the uplink achievable rate, based on which the asymptotic system performance is analyzed when the number of the antennas at the base station and the number of reflecting elements at the RIS grow to infinity. Besides, the power scaling laws of the considered system are revealed to provide energy-saving insights. Furthermore, this paper proposes a gradient ascent-based algorithm to design the phase shifts of the RIS for maximizing the minimum user rate. Finally, numerical results are presented to verify the correctness of analytical conclusions and draw insights.

翻译：本文研究了一种采用低分辨率模数转换器（ADC）的可重构智能表面（RIS）辅助宽带大规模多输入多输出（MIMO）正交频分复用（OFDM）系统。考虑频率选择性Rician衰落信道，并在时域中呈现OFDM数据传输过程。本文推导了上行链路可达速率的闭式近似表达式，并基于此分析了当基站天线数和RIS反射单元数趋于无穷大时的渐近系统性能。此外，揭示了所考虑系统的功率缩放规律，以提供节能方面的见解。更进一步，本文提出了一种基于梯度上升的算法来设计RIS的相位偏移，以最大化最小用户速率。最后，通过数值结果验证了分析结论的正确性并获得了深刻见解。