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Performance of a Threshold-based WDM and ACM for FSO Communication between Mobile Platforms in Maritime Environments

Jae-Eun Han, Sung Sik Nam, Duck Dong Hwang, Mohamed-Slim Alouini

Abstract

In this study, we statistically analyze the performance of a threshold-based multiple optical signal selection scheme (TMOS) for wavelength division multiplexing (WDM) and adaptive coded modulation (ACM) using free space optical (FSO) communication between mobile platforms in maritime environments with fog and 3D pointing errors. Specifically, we derive a new closed-form expression for a composite probability density function (PDF) that is more appropriate for applying various algorithms to FSO systems under the combined effects of fog and pointing errors. We then analyze the outage probability, average spectral efficiency (ASE), and bit error rate (BER) performance of the conventional detection techniques (i.e., heterodyne and intensity modulation/direct detection). The derived analytical results were cross-verified using Monte Carlo simulations. The results show that we can obtain a higher ASE performance by applying TMOS-based WDM and ACM and that the probability of the beam being detected in the photodetector increased at a low signal-to-noise ratio, contrary to conventional performance. Furthermore, it has been confirmed that applying WDM and ACM is suitable, particularly in maritime environments where channel conditions frequently change.

Performance of a Threshold-based WDM and ACM for FSO Communication between Mobile Platforms in Maritime Environments

Abstract

In this study, we statistically analyze the performance of a threshold-based multiple optical signal selection scheme (TMOS) for wavelength division multiplexing (WDM) and adaptive coded modulation (ACM) using free space optical (FSO) communication between mobile platforms in maritime environments with fog and 3D pointing errors. Specifically, we derive a new closed-form expression for a composite probability density function (PDF) that is more appropriate for applying various algorithms to FSO systems under the combined effects of fog and pointing errors. We then analyze the outage probability, average spectral efficiency (ASE), and bit error rate (BER) performance of the conventional detection techniques (i.e., heterodyne and intensity modulation/direct detection). The derived analytical results were cross-verified using Monte Carlo simulations. The results show that we can obtain a higher ASE performance by applying TMOS-based WDM and ACM and that the probability of the beam being detected in the photodetector increased at a low signal-to-noise ratio, contrary to conventional performance. Furthermore, it has been confirmed that applying WDM and ACM is suitable, particularly in maritime environments where channel conditions frequently change.

Paper Structure

This paper contains 21 sections, 70 equations, 11 figures, 3 tables.

Table of Contents

  1. Introduction
  2. System and channel models
  3. Foggy channel
  4. Mobile Platform-based Pointing Error
  5. Composite PDF
  6. Closed-Form Expression of Composite PDF based on HD technique
  7. Closed-Form Expression of Composite PDF based on IM/DD technique
  8. Closed-Form expression of Unified Composite PDF
  9. Closed-Form expression of Unified Composite PDF based on TMOS
  10. Performance analysis of the Outage Probability
  11. Performance analysis with Adaptive modulation
  12. Average Spectral Efficiency
  13. Average Bit Error Rate
  14. Numerical results
  15. Conclusion
  16. ...and 6 more sections

Figures (11)

  • Figure 1: System and channel models of FSO communication between mobile platforms in maritime environments.
  • Figure 2: movemensts of the mobile platforms in maritime environment
  • Figure 3: Beam footprint on the receiver lens plane
  • Figure 4: PDF comparisons for moderate fog with pointing error (i.e., $\sigma=1$).
  • Figure 5: Impact of an adjustable threshold on the outage probability in TMOS-based WDM and non-threshold-based WDM for combined effects of foggy channel with pointing error under both HD and IM/DD techniques with $\gamma_{T}=7.1$ dB.
  • ...and 6 more figures