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October 16, 2025Open Access

Low-Complexity Hybrid Beamforming for Multi-Cell mmWave Massive MIMO: A Primitive Kronecker Decomposition Approach

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This paper designs a low-complexity hybrid beamformer in a multi-cell system, mitigating inter-cell interference and enhancing signal quality.

The proposed hybrid beamformer reduces interference and improves signal quality in multi-cell mmWave systems.
Using primitive kronecker decomposition, the beamformer meets the performance of optimal MMSE schemes with lower complexity.
The approach incorporates a sufficient condition for optimal antenna configuration to enhance performance further.
Simulation results indicate that the new design achieves competitive rates with considerably less hardware cost.

Sun et al. (2025) studied this question.

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This paper designs a low-complexity hybrid beamformer in a multi-cell system, mitigating inter-cell interference and enhancing signal quality.