研究目的

This paper studies the downlink performance of a multiuser MIMO system with massive dual-polarized antenna array at BS. Dual-polarization reduces occupied space for deploying massive antenna arrays. The pilot contamination in uplink channel estimation and downlink interference reduces as well due to receivers with orthogonal polarizations. However, the effective channel space dimension is also reduced by half for each link with cross-polarization discriminations.

研究成果

The paper concludes that the performance of dual-polarized massive MIMO is maximized when vertical and horizontal polarizations have equal probabilities. Moreover, the maximized dual polarization performance is shown asymptotically identical to the performance of a monopole antenna system with large antenna arrays at high SNRs.

研究不足

The analysis assumes that all small channel fadings share the same average gain and the large scale path loss effects differ from each other represented via the coefficients β’s. Therefore, no large scale power control is considered here implicitly. The transmit power budget of beamforming design is then guaranteed via power normalization.