Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Performance Analysis of an AF Dual-hop FSO Communication System with RF Backup Link

  • Alhamawi, Khaled A. (Huawei Technologies) ;
  • Altubaishi, Essam S. (Department of Electrical Engineering, King Saud University)
  • Received : 2019.02.13
  • Accepted : 2019.05.14
  • Published : 2019.08.25
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Abstract

A hybrid free-space-optical/radio-frequency (FSO/RF) communication system is considered, with the help of amplify-and-forward (AF) relaying. We consider various weather conditions to investigate their effects on the system's performance. We begin by obtaining the cumulative distribution function and probability density function of the end-to-end signal-to-noise ratio for the AF dual-hop FSO communication system with RF backup link. Then, these results are used to derive closed-form expressions for the outage probability, average bit-error rate, and average ergodic capacity. The results show that the considered system efficiently employs the complementary nature of FSO and RF links, resulting in impressive performance improvements compared to non-hybrid systems.

Keywords

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FIG. 1. AF Dual-hop FSO communication system with backup RF link.

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FIG. 2. The outage probability of the dual-hop FSO system with and without RF backup link versus the transmitted power PS.

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FIG. 3. The average BER of the dual-hop FSO system with and without RF backup link versus the transmitted power PS.

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FIG. 4. The normalized ergodic capacity of the dualhop FSO system with and without RF backup link versus the transmitted power PS.

TABLE 1. Parameters of the FSO and RF links

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