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Three dimensional (3D) resource reuse is an important design requirement forthe prospective 6G wireless communication systems. Hence, we propose acooperative 3D beamformer for use in 3D space. Explicitly, we harness multiplebase station antennas for joint zero forcing transmit pre-coding for beamingthe transmit signals in specific 3D directions. The technique advocated isjudiciously configured for use in both cell-based and cell-free wirelessarchitectures. We evaluated the performance of the proposed scheme using thenovel metric of Volumetric Spectral Efficiency (VSE). We also characterized theperformance of the scheme in terms of its spectral efficiency (SE) and BitError Rate (BER) through extensive simulation studies.

Cooperative 3D Beamforming for Small-Cell and Cell-Free 6G Systems