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Novel 3D Spatial Wireless Channel Model

Multi antenna element wireless communications systems have shown significantly large capacity gains compared to traditional single input single output systems [1], [2]. However, recent results [3], [4] indicate that such large gains are due to overly simplified assumptions of the spatial wireless channels. Hence, proper understanding of the limitations of MIMO systems as well as the maximal exploitation of the spatial dimension need better modelling of the channel. In this paper, we introduce a 3D spatial model based on spatial basis function decomposition of multipath wave fields. Recent work related to better understanding of MIMO systems are reported in [3]–[8]. The spatial channel models proposed in [7] and [8] are more general and realistic than the usual independent models, however they are based on uniform linear array antennas and discrete set of scatterers around the transmitter and the receiver arrays limiting their generality. The proposed spatial channel model in this paper is valid for arbitrary 3D antenna arrays and based on decomposition of spatial wavefield using spatial basis functions.