Dual-regularized precoding: A robust approach for D2D-enabled massive MIMO

摘要

This paper designs efficient feedback mechanisms to help enable massive MIMO in frequency division multiplexing (FDD) bands. By exploiting possible device-to-device (D2D) coordination and using a team decision approach, a scheme is developed to bridge the feedback in the channel space and that in the precoder space. It is found that the desired feedback and precoding vectors take similar forms as the regularized zero-forcing (RZF) precoder, with additional regularizations to capture any level of uncertainty of the exchanged channel state information (CSI). Numerical results demonstrate superior performance of the proposed scheme for an arbitrary D2D link quality setup.