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Hybrid beamforming design for dual‐polarised millimetre wave MIMO systems

Millimeter wave (mmWave) communications provides a favorable solution for the ever-increasing data rate demands because of its abundant bandwidth availability. The conventional wisdom about mmWave communication channel is that it always exhibits line-of-sight (LOS) propagation with directive antennas. However, it has been shown in the literature that in mobile communications, mmWave frequencies suffer from frequent LOS blockages and exhibit multipath propagation, which motivates the study and analysis of the polarimetric properties of the mmWave channel. While the exploitation of polarization is promising, the cross-polarization associated with it can be detrimental to the overall performance. Therefore, in this paper, we propose a hybrid precoder design which mitigates the cross-polarization by the joint design of a radio-frequency (RF) beamformer as well as the precoder and combiner used in the baseband. We demonstrate through simulations that the proposed design outperforms eigen-beamforming by 10 dB at a given rate, when considering polarization.