Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Does an IRS Degrade Out-of-Band Performance?

L. Yashvanth, Chandra R. Murthy

TL;DR

Surprisingly, it is found that even though the IRS is randomly configured from operator-Y’s view, the OOB operator still benefits from the IRS, witnessing a performance enhancement for free.

Abstract

Intelligent reflecting surfaces (IRSs) were introduced to enhance the performance of wireless systems. However, from a cellular service provider's view, a concern with the use of an IRS is its effect on out-of-band (OOB) quality of service. Specifically, given two operators, say X and Y, providing services in a geographical area using non-overlapping frequency bands, if operator-X uses an IRS to optimally enhance the throughput of its users, does the IRS degrade the performance of operator-Y? We answer this by deriving the ergodic sum spectral efficiency (SE) of both operators under round-robin scheduling. We also derive the complementary cumulative distribution function of the change in effective channel at an OOB user with and without the IRS, which provides deeper insights into OOB performance. Surprisingly, we find that even though the IRS is randomly configured from operator-Y's view, the OOB operator still benefits from the IRS, witnessing a performance enhancement for free. This happens because the IRS introduces additional paths between the nodes, increasing the signal power at the receiver and providing diversity benefits. We verify our findings numerically and conclude that an IRS is beneficial to every operator, even when the IRS is deployed to optimally serve only one operator.

Does an IRS Degrade Out-of-Band Performance?

TL;DR

Surprisingly, it is found that even though the IRS is randomly configured from operator-Y’s view, the OOB operator still benefits from the IRS, witnessing a performance enhancement for free.

Abstract

Intelligent reflecting surfaces (IRSs) were introduced to enhance the performance of wireless systems. However, from a cellular service provider's view, a concern with the use of an IRS is its effect on out-of-band (OOB) quality of service. Specifically, given two operators, say X and Y, providing services in a geographical area using non-overlapping frequency bands, if operator-X uses an IRS to optimally enhance the throughput of its users, does the IRS degrade the performance of operator-Y? We answer this by deriving the ergodic sum spectral efficiency (SE) of both operators under round-robin scheduling. We also derive the complementary cumulative distribution function of the change in effective channel at an OOB user with and without the IRS, which provides deeper insights into OOB performance. Surprisingly, we find that even though the IRS is randomly configured from operator-Y's view, the OOB operator still benefits from the IRS, witnessing a performance enhancement for free. This happens because the IRS introduces additional paths between the nodes, increasing the signal power at the receiver and providing diversity benefits. We verify our findings numerically and conclude that an IRS is beneficial to every operator, even when the IRS is deployed to optimally serve only one operator.
Paper Structure (9 sections, 3 theorems, 24 equations, 4 figures)

This paper contains 9 sections, 3 theorems, 24 equations, 4 figures.

Table of Contents

  1. Introduction
  2. System Model
  3. Out-of-band Performance Analysis
  4. Numerical Results
  5. Conclusions
  6. Proof of Theorem \ref{['thm:rate_characterization']}
  7. System ergodic sum-SE of operator X
  8. System ergodic sum-SE of operator Y
  9. Proof of Theorem \ref{['thm:exact_ccdf']}

Key Result

Theorem 1

With RR scheduling, and under independent Rayleigh fading channels, the ergodic sum-SEs of the operators X and Y when the IRS is optimized to serve the UEs of operator X scale as where $\beta_{r,k} \triangleq \beta_{\mathbf{f}^X}\beta_{\mathbf{g},k}$, and where $\beta_{r,q} \triangleq \beta_{\mathbf{f}^Y}\beta_{\mathbf{g},q}$.

Figures (4)

  • Figure 1: Network scenario of an IRS aided multiple-operator system.
  • Figure 2: Spectral efficiency vs. transmit SNR.
  • Figure 3: Spectral efficiency vs. $\log_2 (N)$.
  • Figure 4: CCDF of $Z^{(Y)}_N$ as a function of $N$.

Theorems & Definitions (5)

  • Theorem 1
  • proof
  • Theorem 2
  • proof
  • Proposition 1