Performance Analysis and Parameter Optimization of Regularized Zero-Forcing in MIMO Broadcast Channels with One-Bit ADCs

Regularized zero-forcing (RZF) has been a cornerstone in wireless communications due to its near-optimal performance and low-complexity design. Despite extensive research on RZF, its capacity with one-bit analog-to-digital converters (ADCs) remains unexplored. This letter addresses this gap by deriving the achievable performance of RZF in MIMO broadcast channels with one-bit ADCs and optimizing the corresponding parameters. Our findings include the derivation of RZF capacity under a reasonable restriction on input distributions imposed by the properties of one-bit ADCs, and an approximation method for the optimal regularizing parameter, ensuring near-optimal performance across varying system configurations. These results extend the applicability of RZF to modern communication systems utilizing low-resolution ADCs.