Coverage Probability of STAR-RIS assisted Massive MIMO systems with Correlation and Phase Errors

Anastasios Papazafeiropoulos, Zaid Abdullah, Pandelis Kourtessis, Steven Kisseleff, Ioannis Krikidis

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Abstract

In this letter, we investigate a simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisting a massive multiple-input multiple-output (mMIMO) system. In particular, we derive a closed-form expression for the coverage probability of a STAR-RIS assisted mMIMO system while accounting for correlated fading and phase-shift errors. Notably, the phase configuration takes place at every several coherence intervals by optimizing the coverage probability since the latter depends on statistical channel state information (CSI) in terms of large-scale statistics. As a result, we achieve a reduced complexity and overhead for the optimization of passive beamforming, which are increased in the case of STAR-RIS networks with instantaneous CSI. Numerical results corroborate our analysis, shed light on interesting properties such as the impact of the number of RIS elements and the effect of phase errors, along with affirming the superiority of STAR-RIS against reflective-only RIS.
Original languageEnglish
Pages (from-to)1738-1742
Number of pages5
JournalIEEE Wireless Communications Letters
Volume11
Issue number8
DOIs
Publication statusPublished - 1 Jun 2022

Keywords

  • 6G networks.
  • Array signal processing
  • Correlation
  • coverage probability
  • Finite element analysis
  • Optimization
  • Probability density function
  • Protocols
  • Reconfigurable intelligent surface (RIS)
  • Reflection
  • simultaneous transmission and reflection
  • spatial correlation

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