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 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 performance of dual-polarized massive MIMO is maximized when vertical and horizontal polarizations have equal probabilities. However, in some cases, the number of users in a cell with different polarizations may not be in balance which violates the condition of optimal capacity.
1：Experimental Design and Method Selection:
The paper considers a multi-cell network with B BSs, each equipped with an M-antenna array. Within the coverage of a single BS, there are K single-antenna users being served simultaneously. The ratio of K/M is a predetermined system parameter, i.e., K/M = α, which implies that the number of scheduled users grows linearly with the number of antennas in massive MIMO.
2：Sample Selection and Data Sources:
Each individual user terminal has an available antenna either horizontally polarized or vertically polarized.
3：List of Experimental Equipment and Materials:
The system operates in TDD mode for channel estimation design in massive MIMO.
4：Experimental Procedures and Operational Workflow:
The paper derives 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.
5：Data Analysis Methods:
The paper analyzes statistical distribution of downlink SINR under pilot contamination and accordingly presents some useful observations.
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