Dual Polarized Omnidirectional Array Element for MIMO Systems

The capacity of a Multiple-Input Multiple-Output (MIMO) system depends on the channel matrix as well as the Signal-to-Noise ratio. A novel dualpolarized planar channel model with one or two scattering rings is used to compare the capacity of different antenna arrays. The correlation between channel matrix elements of the presented channel model and the statistical Kronecker model is also compared. We find that the Kronecker model is equivalent to the “two-ring” model, but not to the “one-ring” model. A dual-polarized omni-directional antenna is presented which provides low correlation between channel elements, in order to achieve high capacity. The capacity simulations show that although linear polarized TX and RX antennas provide higher capacity when they are polarization matched, dualpolarized antennas provide better performance when an arbitrary orientation is considered.