Abstract
In recent years, polarization diversity has gained momentum in the research areas of 5th and 6th generation (5G/6G) wireless communications due to its benefit in the improvement of channel capacity. One driving technology behind polarization diversity is the advancement of polarization-agile antennas that allows flexible reconfiguration of their transmit (Tx) and receive (Rx) polarization. The current polarization-agile antennas can take several discrete polarization angles. This paper proposes a practical scheme to determine optimal Tx and Rx polarization among the limited number of polarization angles to maximize channel capacity. Comprehensive simulation results are provided showing that the multi-polarization multi-input multi-output (MP-MIMO) system toward 6G wireless communications can successfully reach the achievable channel capacity with the practical polarization-agile antennas.
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