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Near-Field Hierarchical Beam Management for RIS-Enabled Millimeter Wave Multi-Antenna Systems
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  • George C. Alexandropoulos ,
  • Vahid Jamali ,
  • Robert Schober ,
  • H. Vincent Poor
George C. Alexandropoulos
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Vahid Jamali
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Robert Schober
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H. Vincent Poor
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In this paper, we present a low overhead beam management approach for near-field millimeter-wave multi-antenna communication systems enabled by Reconfigurable Intelligent Surfaces (RISs). We devise a novel variable-width hierarchical phase-shift codebook suitable for both the near- and far-field of the RIS, and present a fast alignment algorithm for the RIS phase shifts and the transceiver beamformers.