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

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.