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Paper detail

Max-Min Optimal Beamforming for Cell-Free Massive MIMO

This letter develops an optimum beamforming method for downlink transmissions in cell-free massive multiple-input multiple-output (MIMO) systems, which employ a massive number of distributed access points to provide concurrent services to multiple users. The optimum design is formulated as a max-min problem that maximizes the minimum signal-to-interference-plus-noise ratio of all users. It is shown analytically that the problem is quasi-concave, and the optimum solution is obtained with the second-order cone programming. The proposed method identifies the best achievable beamforming performance in cell-free massive MIMO systems. The results can be used as benchmarks for the design of practical low complexity beamformers.

preprint2020arXivOpen access
Andong ZhouJingxian WuErik G. LarssonPingzhi Fan
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Andong ZhouJingxian WuErik G. LarssonPingzhi Fan

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