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We consider the problem of jointly optimizing ADC bit resolution and analogbeamforming over a frequency-selective massive MIMO uplink. We build upon apopular model to incorporate the impact of low bit resolution ADCs, thathitherto has mostly been employed over flat-fading systems. We adopt weightedsum rate (WSR) as our objective and show that WSR maximization under finitebuffer limits and important practical constraints on choices of beams and ADCbit resolutions can equivalently be posed as constrained submodular setfunction maximization. This enables us to design a constant-factorapproximation algorithm. Upon incorporating further enhancements we obtain anefficient algorithm that significantly outperforms state-of-the-art ones.

Optimizing Beams and Bits: A Novel Approach for Massive MIMO Base-Station Design