Dual-Polarized Massive MIMO Systems Under Multi-Cell Pilot Contamination

• Main Authors: Wei Xu, Xian Wu, Xiaodai Dong, Hua Zhang, Xiaohu You
• Format: Article
• Language: English
• Published: IEEE 2016-01-01
• Series: IEEE Access
• Subjects: Massive MIMO; dual-polarized antenna; multi-cell; pilot contamination; channel capacity
• Online Access: https://ieeexplore.ieee.org/document/7572891/

This paper considers a multi-cell network with base stations (BSs) equipped with large dual-polarized antenna arrays. We derive closed-form expressions of network performance in terms of user signal-to-interference-and-noise ratio both with perfect channel state information and in the presence of pilot contamination. In general, a dual-polarized system enjoys the reduction in pilot contamination and multiuser interference due to orthogonal polarizations, while the available BS array dimension is reduced in each polarized direction compared with a monopole antenna setup. The derived results, however, reveal that the performance of a dual polarization system can be optimized by properly setting receive antenna polarizations, and fortunately, the optimal performance behaves identically to that of a monopole-antenna one in massive MIMO. We finally verify the observations by numerical simulations.