Performance Analysis of Hybrid FSO/RF Systems Using the ℳ Distribution and Markov Function

Document Type : Original Article

Authors

1 PhD student, Faculty of Electrical Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran

2 Assistant Professor, Faculty of Computer Engineering, Sharif University of Technology, Tehran, Iran

3 Assistant Professor, Faculty of Electrical, Mechanical and Computer Engineering, Ivanki University, Semnan, Iran

4 Assistant Professor, Faculty of Electrical Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran

Abstract

In passive defense, communication security is very important. Free space optic (FSO) communication has a lot of advantages such as high security and high bandwidth, but it suffers from atmospheric turbulence. For the mitigation of this effect on FSO performance, some methods have been proposed, such as adaptive rate (AR) transmission and automatic repeat request (ARQ). In this paper, the performance of hybrid multi-layer design FSO/RF systems with AR transmission and ARQ, in different atmospheric turbulence conditions is evaluated using the ℳ distribution model for the optical channel. For two designs (namely multi-layer with AR and standard-ARQ, and multi-layer with AR and frame combining ARQ), the spectral efficiency (SE) criteria, the average expected number (AEN) and the level crossing rate (LCR) have been compared. The simulation results show that at the first transmission rate, the maximum LCR= 80, occurs at SNRs 6dB and 2dB, for the first and second designs, respectively. Also, at average spectral efficiency (3.5 bits /sym) and at the persistence level k=2, the maximum LCR= 80 occurs at the SNRs equals to 25dB and 20dB, for the first and second designs, respectively; which shows the advantages of the second design over the first, although these advantages are achieved at higher costs. For example, when SNR equals to 20 dB, the average expected number is 1.00057 in the first and 1.35 in the second design, which indicates the higher energy consumption of the second design.

Keywords

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References

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History

  • Receive Date: 19 November 2020
  • Revise Date: 27 July 2021
  • Accept Date: 01 August 2021
  • Publish Date: 23 September 2022

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