Free-space optics based sensor network design using angle-diversity photodiode arrays

Ghosh, Anjan; Kunta, Swathi; Verma, Pramode K.; Huck, Robert C.

doi:10.1117/12.862087

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…In Equation , α n ,0 ≤ α n ≤ 1, was defined as the attenuation factor of the n th receiver because of either misalignment or angular reception. Specifically, the misalignment coefficient α n for any receiver aperture n directly relates to its azimuth angle in the transmission plane ,

α_{n} MathClass-rel= ({, \begin{matrix} falsenone nonefalsearray \\ arrayleft exp MathClass-open(- φ_{n}^{2} MathClass-close), & arraycenter - \frac{π}{2} < φ_{n} < \frac{π}{2} \\ arrayleft 0, & arraycenter \frac{π}{2} \leq φ_{n} \leq \frac{3 π}{2} \end{matrix} MathClass-punc,) n MathClass-rel= 1 MathClass-punc, 2 MathClass-punc, MathClass-op\dots MathClass-punc, N

where

{({}, φ_{n})}_{n MathClass-rel= 1}^{N}

are the azimuth angles of receivers in a counterclockwise direction, as shown in Figure . Although these angles are RVs, they are dependent on each other on the basis of the separation angles

{({}, θ_{n})}_{n MathClass-rel= 1}^{N}

.…”

Section: Misalignment Statisticsmentioning

confidence: 99%

“…Free space optic‐based mobile nodes can potentially be used in a mobile ad hoc network where an infrastructure is unavailable and/or in a wireless sensor network where communication security, including freedom from susceptibility to jamming, is important . Previous works on mobile FSO focus mainly on alignment and tracking issues and on the design of multielement structure , which are characterized to ensure uninterrupted data flow by auto‐aligning transmitter and receiver modules.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mobile free space optic nodes in single‐input multiple‐output setup under transmitter misalignment

Moradi

Refai

LoPresti

et al. 2011

Wireless Communications

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Wireless optical nodes with mobility capabilities (mobile free space optics [FSO]) have emerged as a way to overcome limitations inherent in FSO links, for example, transmitter-receiver restrictive alignment requirement. This paper proposes the use of an angular diversity model for characterizing the performance of mobile FSO over atmospheric turbulence, and transmitter-receiver misalignment switch-and-examine combining technique is suggested for a diversity combining under unbalanced multireceiving configuration. A laser beam is modeled as spatial Gaussian profile, and channel fading is modeled as a lognormal distribution with spatially uncorrelated samples. Analytical and statistical discussion on the resultant output is presented, and bit error performance and processing load are numerically evaluated and compared with those obtained using selection combining diversity schemes.

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α_{n} MathClass-rel= ({, \begin{matrix} falsenone nonefalsearray \\ arrayleft exp MathClass-open(- φ_{n}^{2} MathClass-close), & arraycenter - \frac{π}{2} < φ_{n} < \frac{π}{2} \\ arrayleft 0, & arraycenter \frac{π}{2} \leq φ_{n} \leq \frac{3 π}{2} \end{matrix} MathClass-punc,) n MathClass-rel= 1 MathClass-punc, 2 MathClass-punc, MathClass-op\dots MathClass-punc, N

where

{({}, φ_{n})}_{n MathClass-rel= 1}^{N}

are the azimuth angles of receivers in a counterclockwise direction, as shown in Figure . Although these angles are RVs, they are dependent on each other on the basis of the separation angles