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Does an IRS Degrade Out-of-Band Performance?

Yashvanth, L and Murthy, CR (2023) Does an IRS Degrade Out-of-Band Performance? In: 24th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2023, 25 - 28 September 2023, Shanghai, pp. 216-220.

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Official URL: https://doi.org/10.1109/SPAWC53906.2023.10304535


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. © 2023 IEEE.

Item Type: Conference Paper
Publication: IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright for this article belongs to Authors.
Keywords: Distribution functions; Signal receivers; Spectrum efficiency, Band quality; Cellular services; Intelligent reflecting surface; Out of band; Out-of-band performance; Performance; Quality-of-service; Reflecting surface; Service provider; Wireless systems, Quality of service
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 29 Feb 2024 04:47
Last Modified: 29 Feb 2024 04:47
URI: https://eprints.iisc.ac.in/id/eprint/83774

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