Low complexity adaptation for reconfigurable intelligent surface-based mimo systems

Zehra Yigit, Ertugrul Basar*, Ibrahim Altunbas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


Reconfigurable intelligent surface (RIS)-based transmission technology offers a promising solution to enhance wireless communication performance cost-effectively through properly adjusting the parameters of a large number of passive reflecting elements. This letter proposes a cosine similarity theorem-based low-complexity algorithm for adapting the phase shifts of an RIS that assists a multiple-input multiple-output (MIMO) transmission system. A semi-analytical probabilistic approach is developed to derive the theoretical average bit error probability (ABEP) of the system. Furthermore, the validity of the theoretical analysis is supported through extensive computer simulations.

Original languageEnglish
Article number9160972
Pages (from-to)2946-2950
Number of pages5
JournalIEEE Communications Letters
Issue number12
Publication statusPublished - Dec 2020

Bibliographical note

Publisher Copyright:
© 1997-2012 IEEE.


Manuscript received July 31, 2020; accepted August 3, 2020. Date of publication August 6, 2020; date of current version December 10, 2020. This work was supported by the Scientific and Technological Research Council of Turkey (TÜB˙TAK) under grant no 117E869. The associate editor coordinating the review of this letter and approving it for publication was Q. Wu. (Corresponding author: Ertugrul Basar.) Zehra Yigit and Ibrahim Altunbas are with the Department of Electronics and Communication Engineering, Istanbul Technical University, 34469 Istanbul, Turkey (e-mail: [email protected]; [email protected]).

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu117E869


    • Reconfigurable intelligent surfaces (RISs)
    • cosine similarity theorem
    • multiple-input multiple-output (MIMO)


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