Power Scaling Law for Optical IRSs and Comparison with Optical Relays

Ajam H, Najafi Kalyani M, Jamali V, Schober R (2022)

Publication Type: Conference contribution

Publication year: 2022

Publisher: Institute of Electrical and Electronics Engineers Inc.

Pages Range: 1527-1533

Conference Proceedings Title: 2022 IEEE Global Communications Conference, GLOBECOM 2022 - Proceedings

Event location: Virtual BR

ISBN: 9781665435406

DOI: 10.1109/GLOBECOM48099.2022.10001121

Abstract

The line-of-sight (LOS) requirement of free-space optical (FSO) systems can be relaxed by employing optical relays and optical intelligent reflecting surfaces (IRSs). Unlike radio frequency (RF) IRSs, which typically exhibit a quadratic power scaling law, the power reflected from FSO IRSs and collected at the receiver lens may scale quadratically or linearly with the IRS size or may even saturate at a constant value. We analyze the power scaling law for optical IRSs and unveil its dependence on the wavelength, transmitter (Tx)-to-IRS and IRS-to-receiver (Rx) distances, beam waist, and lens size. We compare optical IRSs in different power scaling regimes with optical relays in terms of the outage probability, diversity and coding gains, and optimal placement. Our results show that, at the expense of a higher hardware complexity, relay-assisted FSO links yield a better outage performance at high signal-to-noise-ratios (SNRs), but optical IRSs can achieve a higher performance at low SNRs. Moreover, while it is optimal to place relays equidistant from Tx and Rx, the optimal location of IRSs depends on the power scaling regime they operate in.

Authors with CRIS profile

Hedieh Ajam Lehrstuhl für Digitale Übertragung (IDC) Marzieh Najafikalyani Lehrstuhl für Digitale Übertragung (IDC) Robert Schober Lehrstuhl für Digitale Übertragung (IDC)

Involved external institutions

Technische Universität Darmstadt DE Germany (DE)

How to cite

APA:

Ajam, H., Najafi Kalyani, M., Jamali, V., & Schober, R. (2022). Power Scaling Law for Optical IRSs and Comparison with Optical Relays. In 2022 IEEE Global Communications Conference, GLOBECOM 2022 - Proceedings (pp. 1527-1533). Virtual, BR: Institute of Electrical and Electronics Engineers Inc..

MLA:

Ajam, Hedieh, et al. "Power Scaling Law for Optical IRSs and Comparison with Optical Relays." Proceedings of the 2022 IEEE Global Communications Conference, GLOBECOM 2022, Virtual Institute of Electrical and Electronics Engineers Inc., 2022. 1527-1533.

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