A multi-RIS MIMO channel estimation method uses fast-varying RIS reflections and positioning to create a sparse channel, cutting CSI acquisition complexity and downlink pilot overhead.
Prospective multiple antenna technologies for beyond 5G,
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Channel Customization for Low-Complexity CSI Acquisition in Multi-RIS-Assisted MIMO Systems
A multi-RIS MIMO channel estimation method uses fast-varying RIS reflections and positioning to create a sparse channel, cutting CSI acquisition complexity and downlink pilot overhead.