Capacity comparison between dual-polarized antenna systems and omnidirectional antenna systems in 3-D propagation environments

Dual-polarized antenna systems have received more and more attention due to its potential to double the channel capacity compared with omnidirectional single-input single-output (SISO) systems. However, the implementation of dual-polarized systems into real three-dimensional (3-D) environments may result in the power loss from the third polarization direction. Therefore, the channel capacity of dual-polarized systems in real 3-D scenarios will be significantly affected by the power loss. Based on the newly proposed 3-D two-spheric double-bounced geometry-based stochastic channel model, this paper for the first time analyzes this impact of the power loss on the channel capacity and demonstrates the critical maximum elevation spread, where the channel capacity of dual-polarized systems is equal to that of omnidirectional SISO system. The work in this paper is significant for the guidance of the proper application of dual-polarized systems in the future.