A heterogeneous IRS with half static and half dynamic elements can be channel-estimated with lower pilot overhead and still reach near-conventional sum rate if its static elements are pre-configured for wide coverage.
Reconfigurable intelligent surfaces for 6G systems: Principles, applications, and research directions,
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Heterogeneous-IRS-Assisted MIMO Systems: Channel Estimation and Beamforming
A heterogeneous IRS with half static and half dynamic elements can be channel-estimated with lower pilot overhead and still reach near-conventional sum rate if its static elements are pre-configured for wide coverage.