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Free-space communications over exponentiated Weibull turbulence channels with nonzero boresight pointing errors
Optics Express
|April 4, 2015
Summary
This study analyzes urban free-space optical (FSO) communication performance, considering atmospheric turbulence and pointing errors. Analytical expressions reveal how these factors impact bit error rate and outage probability.
Area of Science:
- Optical Communications
- Wireless Communication Systems
- Atmospheric Physics
Background:
- Free-space optical (FSO) systems offer high bandwidth but are susceptible to atmospheric turbulence and pointing errors.
- Accurate performance modeling is crucial for reliable FSO deployment in urban environments.
- Existing models may not fully capture the combined effects of turbulence and realistic misalignment.
Purpose of the Study:
- To develop analytical expressions for FSO system performance under combined atmospheric turbulence and pointing errors.
- To model atmospheric turbulence using the exponentiated Weibull (EW) distribution.
- To analyze the impact of nonzero boresight pointing errors on system reliability.
Main Methods:
- Modeling atmospheric turbulence with the exponentiated Weibull (EW) distribution.
- Adopting a nonzero boresight pointing error probability density function (PDF) model.
- Deriving a composite PDF using a convergent double series and Meijer's G-function.
- Developing exact expressions for average bit error rate (BER) and outage probability.
Main Results:
- A novel composite PDF expression was derived.
- Exact expressions for BER and outage probability were obtained.
- Asymptotic analysis provided insights into high signal-to-noise ratio performance.
Conclusions:
- Diversity gain in FSO systems is influenced by beamwidth, jitter, and turbulence parameters.
- Zero boresight diversity gain depends on beamwidth-to-jitter standard deviation ratio.
- Nonzero boresight diversity gain is affected by beamwidth-to-jitter variance ratio and EW distribution parameters.
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