Abstract
This paper presents a novel model of heterodyne-detected optical code-division multiple-access (OCDMA) systems employing polarization shift keying (PolSK) modulation over a free-space optical (FSO) turbulence channel. In this article, a new transceiver configuration and detailed analytical model for the proposed system are provided and discussed, taking into consideration the potential of heterodyne detection on mitigating the impact of turbulence-induced irradiance fluctuation on the performance of the proposed system under the gamma-gamma turbulence channel. Furthermore, we derived the closed-form expressions for the system error probability and outage probability, respectively. We determine the advantages of the proposed modeling by performing a comparison with a direct detection scheme obtained from an evaluation of link performance under the same environment conditions. The presented work also shows the most significant impact factor that degrades the performance of the proposed system and indicates that the proposed approach offers an optimum link performance compared to conventional cases.
Highlights
Optical wireless communication (OWC), known as free-space optical (FSO) communication, is considered to be a cost-effective, high-capacity communication technology that provides a practical solution to the last mile problem
Since the propagation links are over the atmospheric channel, the laser beam will experience the effects of turbulence, referred to as irradiance fluctuation, phase aberration and changes in the degree of polarization (DOP) [1], which can impair the performance of FSO communications significantly
The rest of the paper is organized as follows: we introduce a statistical model to describe the irradiance fluctuation across the whole turbulence regimes in Section 2; in Section 3, the mathematical model for describing the polarization shift keying (PolSK)-based optical code-division multiple-access (OCDMA) signal transmission through the FSO turbulence link with heterodyne detection is provided; the results are discussed in Section 4; the conclusions are presented in
Summary
Optical wireless communication (OWC), known as free-space optical (FSO) communication, is considered to be a cost-effective, high-capacity communication technology that provides a practical solution to the last mile problem. To cover the shortage of directly-detected FSO systems in overcoming the impact of atmospheric turbulence, the use of heterodyne detection as a countermeasure for the turbulence mitigation has been reported in [15,16]; it has been demonstrated that heterodyne detection can offer a better background noise rejection and increased detector sensitivity compared to direct detection This leads to a potential for channel fading reduction, especially at the high values of turbulence intensity. For the reasons given above, such a study to combine the PolSK-based OCDMA technology and heterodyne detection will be important in designing and optimizing the method to enhance the FSO link performance in the operation environment, combining the advantages of high transmission capacity by multiplexing technology and efficient compensation for the turbulence-induced degradation of signal quality.
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