Performance Analysis of Polarization Modulated Direct Detection Optical CDMA Systems over Turbulent FSO Links Modeled by the Gamma-Gamma Distribution

Photonics

Fan Bai²  Yuwei Su¹ 

[1] Department of Communications and Computer Engineering, Waseda University, 66 bldg. 3-14-9 Ookubo, Shinjuku-ku, Tokyo, Japan; E-Mail:;Graduate School of Globe Information and Telecommunication Studies, Waseda University, 66 bldg. 3-14-9 Ookubo, Shinjuku-ku, Tokyo, Japan; E-Mail:

关键词: free space optical (FSO);    polarization shift keying (PolSK);    optical CDMA (OCDMA);    multiple-access interference (MAI);    Gamma-Gamma distribution;    atmospheric turbulence;    on-off-keying (OOK);   

DOI  :  10.3390/photonics2010139

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.