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Computation
Volume 6
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10.3390/computation6040055
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Article

Spatial Diversity for CDMA RoFSO Links over M Turbulence Channels with Nonzero Boresight Pointing Errors

by
Michalis P. Ninos
and
Hector E. Nistazakis
*
Department of Electronics, Computers, Telecommunications and Control, Faculty of Physics, National and Kapodistrian University of Athens, Athens 15784, Greece
*
Author to whom correspondence should be addressed.
Computation 2018, 6(4), 55; https://doi.org/10.3390/computation6040055
Submission received: 9 September 2018 / Revised: 19 October 2018 / Accepted: 25 October 2018 / Published: 28 October 2018
(This article belongs to the Section Computational Engineering)
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Abstract

A CDMA RoFSO link with receivers’ spatial diversity is studied. Turbulence-induced fading, modeled by the M(alaga) distribution, is considered that hamper the FSO link performance along with the nonzero boresight pointing errors effect. Novel, analytical closed-form expressions are extracted for the estimation of the average bit-error-rate and the outage probability of the CDMA RoFSO system for both directions of the forward and the reverse link. The numerical results show clearly the performance improvement of using spatial diversity, even in the most adverse atmospheric conditions with strong and saturated atmospheric turbulence with enhanced misalignment. Also, the effects of nonlinear distortion, multiple access interference and clipping noise aggravate the performance of the link, where cases with large number of users are taken into account.
Keywords: free-space optical communications; spatial diversity; RoFSO; CDMA; malaga distribution; nonzero boresight pointing errors free-space optical communications; spatial diversity; RoFSO; CDMA; malaga distribution; nonzero boresight pointing errors

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MDPI and ACS Style

Ninos, M.P.; Nistazakis, H.E. Spatial Diversity for CDMA RoFSO Links over M Turbulence Channels with Nonzero Boresight Pointing Errors. Computation 2018, 6, 55. https://doi.org/10.3390/computation6040055

AMA Style

Ninos MP, Nistazakis HE. Spatial Diversity for CDMA RoFSO Links over M Turbulence Channels with Nonzero Boresight Pointing Errors. Computation. 2018; 6(4):55. https://doi.org/10.3390/computation6040055

Chicago/Turabian Style

Ninos, Michalis P., and Hector E. Nistazakis. 2018. "Spatial Diversity for CDMA RoFSO Links over M Turbulence Channels with Nonzero Boresight Pointing Errors" Computation 6, no. 4: 55. https://doi.org/10.3390/computation6040055

APA Style

Ninos, M. P., & Nistazakis, H. E. (2018). Spatial Diversity for CDMA RoFSO Links over M Turbulence Channels with Nonzero Boresight Pointing Errors. Computation, 6(4), 55. https://doi.org/10.3390/computation6040055

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