Abstract
The tripolarized MIMO system can provide one more degree of freedom and have a more compacted size over a dual-polarized MIMO system, which is attractive for high-capacity wireless communication systems. In this paper, we analyze and model channel properties for tripolarized MIMO systems based on experimental channel measurements in typical indoor and outdoor scenarios. Firstly, channel measurement campaigns in the laboratory and the Urban Micro (UMi) scenarios on sub-6 GHz bands are presented. Then, based on measured data, path loss, delay spread (DS), and cross-polarization discrimination (XPD) for 9 polarization combinations are analyzed and modeled in a statistical way. Statistical results of these channel properties are also given. It is observed that channel properties of both large-scale fading and small-scale fading depend strongly on the polarization direction. Furthermore, we evaluate the performance of tripolarized MIMO systems by analyzing the Demmel condition number and channel capacity gain (CG). For both the indoor and the outdoor scenarios, it is found that colocated tripolarized antenna can bring a nearly threefold CG with respect to the unipolarized one. These results can give good insights into the design and evaluation of tripolarized MIMO systems.
Highlights
In February 2020, the international telecommunication union (ITU) started the research towards 2030 and future sixth generation (6G). is indicates that 6G research has been evolved in the standardization plan of ITU
We investigate the channel characteristics and evaluate the performance of tripolarized MIMO systems based on channel measurements in realistic environments, i.e., the laboratory and the Urban Micro (UMi) scenario. e path loss, delay spread (DS), and XPD for 9 polarization combinations are analyzed and modeled
We find that there is a dependency of these large-scale and small-scale parameters on the polarization direction
Summary
In February 2020, the international telecommunication union (ITU) started the research towards 2030 and future sixth generation (6G). is indicates that 6G research has been evolved in the standardization plan of ITU. We would give a review of research on channel properties for tripolarized MIMO systems. We can see that the current research on channel properties for tripolarized MIMO systems mainly focuses on the analysis of XPD, correlation coefficient, and CG. We would give a relatively comprehensive investigation of channel properties for tripolarized MIMO systems. Channel measurements in both indoor and outdoor scenarios are conducted in the real world by using a virtual trip-polarized MIMO channel sounder to provide channel raw data. (ii) Based on measured channel raw data in the laboratory and the UMi scenarios, we analyze channel properties of large-scale fading and small-scale fading for tripolarized MIMO systems, including path loss, DS, and XPD.
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