Time-Domain Correlation-Based Multipath Modeling of Wideband Space-Polarization MIMO Channels

In this paper we propose a time-domain correlation-based model for wideband space-polarization MIMO channels that incorporates most important behaviors of such architectures utilizing linearly-polarized arrays. Our model incorporates power imbalance and asymmetric path K-factors and also takes into account the existence of multiple line-of-sight rays. We show that due to multiple Rician path models in the wideband system, the narrowband subband channels do not always follow the Rice distribution. This discussion is clarified with a simple two path sample channel. Therefore, it is shown that the time-domain correlation based model is more accurate than the frequency-domain counterparts which model narrowband subband channels. Furthermore, the rank of line-of-sight space-polarization MIMO channels is shown to as good or higher than the rank of co-polarized MIMO channels.