Dynamic Metasurface Antenna-Enabled Multistream Multicast Transmission With Finite-Alphabet Inputs

Abstract

Dynamic metasurface antennas (DMAs) have emerged as a promising solution for reducing the power consumption, hardware cost, and physical size of multiple-input multiple-output (MIMO) systems. This article investigates a DMA-enabled multistream multicast system with finite-alphabet inputs by exploiting statistical channel state information (CSI). The ergodic multicast rate (EMR) maximization problem is formulated, and a closed-form approximation of the EMR is derived. To jointly optimize the digital precoder and the DMA weight matrix, a penalty dual decomposition (PDD)-based algorithm is proposed. Numerical results verify the accuracy of the approximation and demonstrate the effectiveness of the proposed algorithm, as well as the benefits of DMA in enhancing multistream multicast transmission.