For XL-IRS assisted multi-user systems with near-field spherical wavefronts, deployment near the user maximizes beamforming gain while deployment near the base station maximizes spatial multiplexing, with a numerical trade-off between the two.
How to deploy intel ligent reflecting surfaces in wireless network: BS-side, user-sid e, or both sides?
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Deployment Optimization for XL-IRS Assisted Multi-User Communications
For XL-IRS assisted multi-user systems with near-field spherical wavefronts, deployment near the user maximizes beamforming gain while deployment near the base station maximizes spatial multiplexing, with a numerical trade-off between the two.