Reduction of the beam pointing error for improved free-space optical communication link performance

Ibrahima Ndoye, Wenqi Cai, Asem Ibrahim Alwan Al-Alwan, Xiaobin Sun, Wael Ghazy Headary, Mohamed-Slim Alouini, Boon S. Ooi, Taous-Meriem Laleg-Kirati

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Free-space optical communication is emerging as a low-power, low-cost, and high data rate alternative to radio-frequency communication in short- to medium-range applications. However, it requires a close-to-line-of-sight link between the transmitter and the receiver. This paper proposes a robust H∞ control law for free-space optical (FSO) beam pointing error systems under controlled weak turbulence conditions. The objective is to maintain the transmitter–receiver line, which means the center of the optical beam as close as possible to the center of the receiving aperture within a prescribed disturbance attenuation level. First, we derive an augmented nonlinear discrete-time model for pointing error loss due to misalignment caused by weak atmospheric turbulence. We then investigate the H∞-norm optimization problem that guarantees the closed-loop pointing error is stable and ensures the prescribed weak disturbance attenuation. Furthermore, we evaluate the closed-loop outage probability error and bit error rate (BER) that quantify the free-space optical communication performance in fading channels. Finally, the paper concludes with a numerical simulation of the proposed approach to the FSO link’s error performance.
Original languageEnglish (US)
Pages (from-to)100154
JournalIFAC Journal of Systems and Control
StatePublished - Apr 7 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-06-23
Acknowledged KAUST grant number(s): BAS/1/1627-01-01, REP/1/2878-01-01
Acknowledgements: This work has been supported by the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, Base Research Fund (BAS/1/1627-01-01) to Taous Meriem Laleg and KAUST − King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia, Special Initiative (KKI) Program, REP/1/2878-01-01.


Dive into the research topics of 'Reduction of the beam pointing error for improved free-space optical communication link performance'. Together they form a unique fingerprint.

Cite this