A fifth-order Vandermonde-structured CP decomposition estimates multipath channel parameters for active RIS broadband links, including the direct transmitter-receiver path, with mostly linear algebra and optional refinements.
Two-stage channel esti- mation for hybrid RIS assisted MIMO systems,
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Structured Tensor Decomposition Based Channel Estimation and Double Refinements for Active RIS Empowered Broadband Systems
A fifth-order Vandermonde-structured CP decomposition estimates multipath channel parameters for active RIS broadband links, including the direct transmitter-receiver path, with mostly linear algebra and optional refinements.