Journal
IEEE COMMUNICATIONS LETTERS
Volume 25, Issue 9, Pages 3134-3138Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2021.3082214
Keywords
Receivers; Channel models; Wireless communication; Surface impedance; Hardware; Fading channels; Metasurfaces; Channel modeling; electromagnetics; performance analysis; reconfigurable intelligent surfaces (RISs); simultaneous transmission and reflection
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This letter investigates simultaneous transmitting and reflecting reconfigurable intelligent surfaces (STAR-RISs), which extend coverage to 360 degrees compared to conventional reflecting-only RISs. A general hardware model and channel models are presented for STAR-RISs, showing superior diversity gain compared to conventional RISs through numerical simulations. Full diversity order is achievable on both sides of the STAR-RIS.
In this letter, simultaneous transmitting and reflecting reconfigurable intelligent surfaces (STAR-RISs) are studied. Compared with the conventional reflecting-only RISs, the coverage of STAR-RISs is extended to 360 degrees via simultaneous transmission and reflection. A general hardware model for STAR-RISs is presented. Then, channel models are proposed for the near-field and the far-field scenarios, based on which the diversity gain of the STAR-RISs is analyzed and compared with that of the conventional RISs. Numerical simulations are provided to verify analytical results and to demonstrate that full diversity order can be achieved on both sides of the STAR-RIS.
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