Hybrid RIS-Empowered Reflection and Decode-and-Forward Relaying for Coverage Extension

Yıldırım İ., Kilinc F., Basar E., Alexandropoulos G. C.

IEEE COMMUNICATIONS LETTERS, cilt.25, sa.5, ss.1692-1696, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25 Sayı: 5
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1109/lcomm.2021.3054819
  • Dergi Adı: IEEE COMMUNICATIONS LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1692-1696
  • Anahtar Kelimeler: Relays, Signal to noise ratio, Optimization, Fading channels, Random variables, Wireless networks, Reliability, 6G, relaying, reconfigurable intelligent surface
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

In this letter, we introduce two hybrid transmission schemes combining a passive reconfigurable intelligent surface (RIS) with decode-and-forward relaying in a synergistic manner. The proposed schemes offer a flexible as well as cost-and power-efficient solution for coverage extension in future generation wireless networks. We present closed-form expressions for the end-to-end signal-to-noise ratio of both schemes and a sequential optimization algorithm for the power allocation and the RIS phase configurations. Our computer simulations and theoretical analysis demonstrate that the RIS and relaying technologies enhance the achievable rate and error performance remarkably when working complementary to each other, rather than being considered as competing technologies.