Multi-User Holographic Communications via Channel Operator Diagonalization

This paper investigates a multi-user Holographic Multiple-Input Single-Output (MISO) system, where a continuous surface transmitter communicates with multiple dipole receivers. The channel is diagonalized by selecting an optimal basis for both the transmitter and receivers, with the complexity scaling linearly with the number of users. The spectral efficiency of the proposed eigen-based Holographic MISO (HMISO) system is analyzed and compared to that of a Fourier-based HMISO and a conventional fully-digital MISO system under additive white Gaussian noise. Results indicate that the proposed eigen-based HMISO outperforms both systems in terms of spectral efficiency.