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arXiv · 2606.31911

Trade-Offs in Decentralized Gigantic MIMO with Hard-Boundary Constraints

Juan Vidal Alegría·Joao Vieira·Ove Edfors
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Abstract

To maintain the antenna apertures offered by 5G massive MIMO systems operating at the sub-6GHz band, known as FR1, 6G base stations (BSs) using the upper-mid band, FR3, should increase the number of antennas by a factor 4-8, giving rise to gigantic MIMO. This poses challenges in terms of processing complexity and interconnection bandwidth. The WAX framework, previously introduced for exploring trade-offs in decentralized architectures, may offer the flexibility needed to tackle these challenges. However, no results have been established on the applicability of this framework in the presence of hard-boundary constraints. The current work explores gigantic MIMO implementations based on a novel adaptation of the WAX framework, where the decentralized processing is performed by non-cooperating hardware modules. These modules may be implemented through state-of-the-art massive MIMO baseband units (BBUs). The results show the potential of the proposed framework towards exploiting trade-offs between complexity and performance in practical gigantic MIMO implementations.

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Juan Vidal Alegría, Joao Vieira, Ove Edfors. 2026-06-30. Trade-Offs in Decentralized Gigantic MIMO with Hard-Boundary Constraints. https://arxiv.org/abs/2606.31911

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