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Orthogonal Frequency Division Multiplexing Techniques Comparison for Underwater Optical Wireless Communication

Jie Lian1, Yan Gao2, Peng Wu3

  • 1Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA 22903, USA. jl5qn@virginia.edu.

Sensors (Basel, Switzerland)
|January 10, 2019
PubMed
Summary

We compared three optical orthogonal frequency division multiplexing (OFDM) techniques for underwater wireless communication. Unipolar OFDM (U-OFDM) offers longer distances or lower power needs, especially at lower data rates.

Keywords:
BEROFDMband-limited channeloptical wireless communicationspeak power constraintpropagation distanceturbulence fadingunderwater communications

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Area of Science:

  • Optical wireless communication
  • Underwater optical communication systems
  • Wireless networking

Background:

  • Optical wireless communication offers energy-efficient, high-speed, and secure connections.
  • Underwater optical wireless communication faces challenges including turbulence and limited bandwidth.

Purpose of the Study:

  • To compare three optical orthogonal frequency division multiplexing (OFDM) techniques: DC-biased optical OFDM (DCO-OFDM), asymmetrically-clipped optical OFDM (ACO-OFDM), and unipolar OFDM (U-OFDM).
  • To analyze their performance in underwater optical wireless communication systems considering peak power constraints, light source bandwidth, channel turbulence, and estimation errors.
  • To optimize modulation index and apply bit-loading algorithms to maximize data propagation distance.

Main Methods:

  • Modeling the signal-to-noise ratio (SNR) and clipping effects for DCO-OFDM, ACO-OFDM, and U-OFDM.
  • Optimizing the modulation index to balance clipping distortion and SNR.
  • Applying a bit-loading algorithm to enhance data transmission.

Main Results:

  • DCO-OFDM shows superior performance at high transmitted bit rates relative to channel bandwidth.
  • U-OFDM provides a longer propagation distance or requires less transmitted power at lower bit rates.
  • The choice of OFDM technique depends on the trade-off between data rate and channel conditions.

Conclusions:

  • U-OFDM is a competitive technique for underwater optical wireless communication, particularly when lower data rates or extended range are prioritized.
  • Optimization strategies like modulation index adjustment and bit-loading are crucial for maximizing performance in challenging underwater environments.
  • The study provides valuable insights for selecting appropriate OFDM techniques to enhance underwater optical wireless communication systems.