Estimation and performance analysis of multiple incident beam misalignment in spatial diversity based FSO transmissions

Sung Jin Kim, Sang Kook Han

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A novel approximated misalignment model of an alignment error with multiple incident beams in the position detection of the pointing, acquisition, and tracking (PAT) system is developed for spatial diversity based free-space optical (FSO) communication system. A centroid algorithm used in position detection of the incident beam to align transceivers for the PAT system can make additional pointing errors when multiple beams are incident on the position detector. The centroid algorithm measures the alignment errors through the ratio of the segmented received powers from the position detector. Therefore, the distant arrangement of transmitters and the atmospheric fading affect the alignment error, and the pointing loss of FSO communication increases. We propose a statistical misalignment model with multiple incident beams and analyze the transmission performance using this model to achieve power-efficient FSO communication. The optimum beam width with the misalignment model can reduce the transmit power required to satisfy system demands and outage probability with redundant power for reliable FSO communication.

Original languageEnglish
Article number128618
JournalOptics Communications
Publication statusPublished - 2022 Oct 15

Bibliographical note

Funding Information:
This work was supported by Institute for Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korean government (MSIT) (No. 2019-0-00685 , Free space optical communication based vertical mobile network).

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


Dive into the research topics of 'Estimation and performance analysis of multiple incident beam misalignment in spatial diversity based FSO transmissions'. Together they form a unique fingerprint.

Cite this