We focus on the sum-rate performance of a full-duplex (FD) communication system assisted by a simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS). Contrary to previous work, we account for the unavoidable spatial correlation at the STAR-RIS, and we result in closed-form expressions based on statistical channel state information (CSI), expressed by large-scale statistics. Moreover, we propose a novel maximization of the sum-rate by optimizing simultaneously both the amplitudes and the phase-shifts of the STAR-RIS. This method has a reduced overhead, which is quite important on STAR-RIS systems that are implemented with double elements compared to conventional-RIS.

Original languageEnglish
Pages (from-to)3004-3008
Number of pages5
JournalIEEE Communications Letters
Issue number12
Early online date8 Sept 2022
Publication statusPublished - 1 Dec 2022


  • Antennas
  • Correlation
  • Downlink
  • Protocols
  • Rayleigh channels
  • Reflection
  • Uplink
  • 6G
  • Reconfigurable intelligent surfaces
  • full-duplex


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