A Novel GBSM for Holographic MIMO Communication Systems

As one of the most promising technologies to fulfill the vision for the sixth-generation (6G) networks, holographic multiple-input multiple-output (MIMO) is a significant technology under research. In this paper, a novel three-dimensional (3D) geometry-based stochastic model (GBSM) for holographic MIMO communications that includes mutual coupling (MC) is proposed. The holographic MIMO is modeled as an antenna array in compact area with limited element spacing. With comprehensive considerations of the factors of scatterers distribution, geometry relationships, and coupling coefficients, the channel impulse response (CIR) and statistical properties of the proposed channel model including the space-time correlation function (STCF), level crossing rate (LCR), average fade duration (AFD), and instantaneous channel capacity are investigated. Compared to the modified method of the equal area (MMEA) based simulation model, the simulation results demonstrate that the statistical properties of our proposed model confirms the theoretical results well and holographic MIMO has the potential to increase channel capacity.