Optimization of hybrid high-throughput MIMO system with misaligned FSO link under varied weather

Dubey, Dheeraj; Prajapati, Yogendra Kumar; Tripathi, Rajeev

doi:10.1117/1.oe.60.8.086106

Cited by 5 publications

(13 citation statements)

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“…The pointing error parameter,  , is defined as the ratio between the equivalent beam waist or radius at the receiver ( Leq W ) and the standard deviation of the jitter or pointing error at the receiver ( s  ). It can be expressed as [6,16,55,56]:…”

Section: I Fmentioning

confidence: 99%

“…At distance 0 L  , the fraction of the collected power is represented by parameter A . It is expressed as [6,16,55,56]:…”

Section: I Fmentioning

confidence: 99%

“…Additionally, the PDF of the Gamma-gamma distribution model, taking into account the effects of misalignment, is derived in [6,16,56] as:…”

Section: I Fmentioning

confidence: 99%

“…These misalignments arise from either mechanical vibrations in the system as a result of wind or building movement or errors in the tracking system. The displacement of the laser beam along vertical (elevation) and horizontal (azimuth) directions, which are generally expected to be independent Gaussian random variables, result in pointing errors [14][15][16][17][18][19]. Beam width, boresight, and jitter are the three fundamental components of a pointing error.…”

Section: Introductionmentioning

confidence: 99%

“…This inherent boresight displacement corresponds to a fixed distance, namely the distance between each received aperture and its associated alignment point. The second is related to the boresight error caused by the building's thermal expansion [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Scintillation Effects on Free Space Optical Communication Links in South Africa

2022

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The performance of free space optical communication (FSOC) systems is severely degraded by certain atmospheric conditions prevalent in places where they are deployed, in spite of their numerous advantages. In clear weather conditions, the random fluctuation in the atmosphere’s refractive index causes substantial scintillation losses to transmitted optical signals. It is therefore imperative to estimate the potential losses due to atmospheric turbulence in locations where FSOC links are to be deployed. This will provide the necessary fade margin for FSOC systems so that designed links withstand such atmospheric disturbances. In this paper, statistical analysis of wind speed data collected for various cities of South Africa is used for calculating the corresponding refractive index structure parameter (Cn2). These Cn2 values, as well as the zero inner scale and infinite outer scale model and finite inner and finite outer scale model, are used in computing the scintillation indices not exceeding 50%, 99%, 99.9%, and 99.99% of the time for the investigated locations. The Lognormal and Gamma–gamma distribution models are then employed for the computational analysis of the irradiance fluctuations and channel characteristics while considering the effect of pointing errors for weak and moderate to strong turbulence regimes. Finally, derived mathematical expressions for outage probabilities and bit error rate (BER) performances for FSOC links, employing various intensity modulation and direct detection (IM/DD) schemes, are presented.

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Section: I Fmentioning

confidence: 99%

“…At distance 0 L  , the fraction of the collected power is represented by parameter A . It is expressed as [6,16,55,56]:…”

Section: I Fmentioning

confidence: 99%

“…Additionally, the PDF of the Gamma-gamma distribution model, taking into account the effects of misalignment, is derived in [6,16,56] as:…”

Section: I Fmentioning

confidence: 99%