Relay-aided free-space optical communications using α−μ distribution over atmospheric turbulence channels with misalignment errors

Abhijeet Upadhya, Vivek K. Dwivedi, G. Singh

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

In this paper, we have analyzed the performance of dual hop radio frequency (RF)/free-space optical (FSO) fixed gain relay environment confined by atmospheric turbulence induced fading channel over FSO link and modeled using α−μ distribution. The RF hop of the amplify-and-forward scheme undergoes the Rayleigh fading and the proposed system model also considers the pointing error effect on the FSO link. A novel and accurate mathematical expression of the probability density function for a FSO link experiencing α−μ distributed atmospheric turbulence in the presence of pointing error is derived. Further, we have presented analytical expressions of outage probability and bit error rate in terms of Meijer-G function. In addition to this, a useful and mathematically tractable closed-form expression for the end-to-end ergodic capacity of the dual hop scheme in terms of bivariate Fox's H function is derived. The atmospheric turbulence, misalignment errors and various binary modulation schemes for intensity modulation on optical wireless link are considered to yield the results. Finally, we have analyzed each of the three performance metrics for high SNR in order to represent them in terms of elementary functions and the achieved analytical results are supported by computer-based simulations.

Original languageEnglish
Pages (from-to)117-124
Number of pages8
JournalOptics Communications
Volume416
DOIs
Publication statusPublished - 1 Jun 2018
Externally publishedYes

Keywords

  • Bivariate H-function
  • Free space optical communication
  • Meijer-G function
  • α−μ distribution

ASJC Scopus subject areas

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

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