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Photonics 2015, 2(1), 139-155; doi:10.3390/photonics2010139

Performance Analysis of Polarization Modulated DirectDetection Optical CDMA Systems over Turbulent FSO LinksModeled by the Gamma-Gamma Distribution

1
Graduate School of Globe Information and Telecommunication Studies, Waseda University, 66 bldg. 3-14-9 Ookubo, Shinjuku-ku, Tokyo, Japan
2
Department of Communications and Computer Engineering, Waseda University, 66 bldg. 3-14-9 Ookubo, Shinjuku-ku, Tokyo, Japan
*
Author to whom correspondence should be addressed.
Received: 8 January 2015 / Revised: 20 January 2015 / Accepted: 22 January 2015 / Published: 29 January 2015
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Abstract

This paper proposes a theoretical study to characterize the transmission of optical code division multiple access (CDMA) systems deploying polarization shift keying (PolSK) over a free space optical (FSO) link under the impact of atmospheric turbulence. In our analysis, a novel transceiver architecture for atmospheric OCDMA FSO systems based on polarization modulation with direct detection is proposed and discussed. A detailed analytical model for PolSK-OCDMA systems over a turbulent FSO link is provided. Further, we derive a closed-form bit error ratio (BER) and outage probability expressions, taking into account the multiple-access interference (MAI), optical noise and the atmospheric turbulence effect on the FSO link modeled by the Gamma-Gamma distribution. Finally, the results of this study show the most significant parameters that degrade the transmission performance of the PolSK-OCDMA signal over FSO links and indicate that the proposed approach offers improved bit error ratio (BER) performances compared to the on-off-keying (OOK) modulation scheme in the presence of turbulence. View Full-Text
Keywords: free space optical (FSO); polarization shift keying (PolSK); optical CDMA(OCDMA); multiple-access interference (MAI); Gamma-Gamma distribution; atmosphericturbulence; on-off-keying (OOK) free space optical (FSO); polarization shift keying (PolSK); optical CDMA(OCDMA); multiple-access interference (MAI); Gamma-Gamma distribution; atmosphericturbulence; on-off-keying (OOK)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bai, F.; Su, Y.; Sato, T. Performance Analysis of Polarization Modulated DirectDetection Optical CDMA Systems over Turbulent FSO LinksModeled by the Gamma-Gamma Distribution. Photonics 2015, 2, 139-155.

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