On polarization channel modeling

The use of MIMO technology has yielded high capacity in commercial wireless systems. However, a major issue of MIMO systems is that the channel capacity is highly dependent on the correlation between antenna elements. Therefore, multi-polarized antennas have been implemented in MIMO systems to reduce the antenna correlation and realize compact devices. To better understand the performance of multi-polarized antennas as compared to their uni-polarized counterparts in MIMO transmission, polarized channel modeling is necessary. This article presents an overview of polarized channel modeling. We compare different multi-polarized MIMO models and give some tips for choosing proper MIMO systems. In addition, some open problems are discussed.