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Impact of Inter-Operator Interference via Reconfigurable Intelligent Surfaces

Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Panagiotis A. Karkazis, Helen C. Leligou, Petar Popovski

TL;DR

The proposed framework is quite general since it is valid under arbitrary channel fading conditions as well as the presence of the transceiver’s direct link and the derived analytical results are verified via numerical and simulation trial.

Abstract

A wireless communication system is studied that operates in the presence of multiple reconfigurable intelligent surfaces (RISs). In particular, a multi-operator environment is considered where each operator utilizes an RIS to enhance its communication quality. Although out-of-band interference does not exist (since each operator uses isolated spectrum resources), RISs controlled by different operators do affect the system performance of one another due to the inherently rapid phase shift adjustments that occur on an independent basis. The system performance of such a communication scenario is analytically studied for the practical case where discrete-only phase shifts occur at RIS. The proposed framework is quite general since it is valid under arbitrary channel fading conditions as well as the presence (or not) of the transceiver's direct link. Finally, the derived analytical results are verified via numerical and simulation trial as well as some novel and useful engineering outcomes are manifested.

Impact of Inter-Operator Interference via Reconfigurable Intelligent Surfaces

TL;DR

The proposed framework is quite general since it is valid under arbitrary channel fading conditions as well as the presence of the transceiver’s direct link and the derived analytical results are verified via numerical and simulation trial.

Abstract

A wireless communication system is studied that operates in the presence of multiple reconfigurable intelligent surfaces (RISs). In particular, a multi-operator environment is considered where each operator utilizes an RIS to enhance its communication quality. Although out-of-band interference does not exist (since each operator uses isolated spectrum resources), RISs controlled by different operators do affect the system performance of one another due to the inherently rapid phase shift adjustments that occur on an independent basis. The system performance of such a communication scenario is analytically studied for the practical case where discrete-only phase shifts occur at RIS. The proposed framework is quite general since it is valid under arbitrary channel fading conditions as well as the presence (or not) of the transceiver's direct link. Finally, the derived analytical results are verified via numerical and simulation trial as well as some novel and useful engineering outcomes are manifested.
Paper Structure (11 sections, 19 equations, 3 figures)

This paper contains 11 sections, 19 equations, 3 figures.

Table of Contents

  1. Introduction
  2. System and Signal Model
  3. Outage Probability and Spectral Efficiency
  4. Special Cases
  5. Zero phase shift error
  6. w/o direct link
  7. w/o RIS at reference operator
  8. Multi-operators/multi-RISs
  9. Takeaways
  10. Numerical Results and Discussion
  11. Conclusion

Figures (3)

  • Figure 1: The considered system model, where a base station (BS) stands for the transmitter, the receiver is the reference system user and the communication is aided through ${\rm RIS}_{1}$ which is directly controlled by its corresponding operator. Meanwhile, ${\rm RIS}_{2}$ operates independently in a close vicinity, which is controlled by a different operator.
  • Figure 2: Spectral efficiency vs. various transmit SNR values for different system setups. The term '${\rm asy}$' stands for the asymptotic $\mathcal{C}_{(N\rightarrow \infty)}$ as per \ref{['asycap']}.
  • Figure 3: Spectral efficiency vs. various transmit SNR values of the considered system model while using different ranges of the heterogeneous RIS array.