  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.
