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access icon free Effect of avalanche photodiode and thermal noises on the performance of binary phase-shift keying-subcarrier-intensity modulation/free-space optical systems over turbulence channels

© The Institution of Engineering and Technology
Received 02/10/2012, Accepted 15/03/2013, Revised 09/02/2013, Published

In this study, the authors theoretically study the performance of direct-detection free-space optical communication systems using binary phase-shift keying subcarrier-intensity modulation and avalanche photodiode (APD). The system bit-error rate and channel capacity are theoretically derived in cases of log-normal and gamma-gamma channel models for weak-to-moderate and moderate-to-strong atmospheric turbulence conditions, respectively. The authors quantitatively discuss the optimal values of the APD average gain, required transmitted optical power, and operating bit-rate considering various turbulence conditions, APD shot noise and thermal noise. It is seen that, although the impact of turbulence is severe, a proper selection of APD average gain could significantly improve the system performance in both cases of turbulence channels. The optimal value of APD average gain remains almost the same for different levels of turbulence; nevertheless it varies significantly in accordance to the change of receiver noise temperature.

Inspec keywords: atmospheric turbulence; thermal noise; optical communication; wireless channels; avalanche photodiodes; error statistics; phase shift keying

Other keywords: APD average gain; wireless optical communications; APD shot noise; gamma-gamma channel model; thermal noise; required transmitted optical power; moderate-to-strong atmospheric turbulence conditions; direct-detection free-space optical communication systems; weak-to-moderate atmospheric turbulence conditions; turbulence channels; binary phase-shift keying-subcarrier-intensity modulation; avalanche photodiode; log-normal channel model; receiver noise temperature; system bit-error rate; thermal noises; operating bit-rate; channel capacity

Subjects: Modulation and coding methods; Other topics in statistics; Free-space optical links; Photoelectric devices

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