Performance analysis of QPSK in free-space optical communications channel with phase compensation error

Author

Xiaoli Yin ; Junyu Shang ; Yulu Chen ; Ji Hao ; Li Li ; Xiangjun Xin ; Chongxiu Yu

Author_Institution

Sch. of Electron. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China

fYear

2013

fDate

16-18 May 2013

Firstpage

640

Lastpage

644

Abstract

Performance of free-space optical (FSO) links employed quadrature phase shift keying (QPSK) modulation with phase compensation error over Gamma-Gamma turbulent channel is investigated in this paper. By considering the key factors of weather condition, additional noise and phase noise, the closed-form expressions of symbol error rate (SER) are derived by employing the hyper-geometric functions substitution method. Numerical results show that for FSO system, SER must be the trade off between transmission distance and weather condition, but it suffers more from the weather condition. The effects of imperfect phase compensation on system performance are also studied. Phase noise, which is described by phase compensation error variance parameter σ_Δφ², will lead to great degradation to system SER. Increased system signal to noise rate (SNR) helps to increase the system tolerance to σ_Δφ² and the maximum tolerable σ_Δφ² is around 10° for all weather conditions.

Keywords

compensation; geometry; optical communication; optical links; optical modulation; phase noise; quadrature phase shift keying; telecommunication channels; FSO link; Gamma-Gamma turbulent channel; QPSK modulation; SER; additional noise; closed-form expression; free-space optical communication channel; free-space optical link; hypergeometric function substitution method; imperfect phase compensation error; performance analysis; phase noise; quadrature phase shift keying modulation; signal to noise rate; symbol error rate; weather condition; atmospheric turbulence channel; free-space optical; hyper-geometric function substitution; phase compensation error; symbol error rate;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless and Optical Communication Conference (WOCC), 2013 22nd

Conference_Location

Chongqing

Print_ISBN

978-1-4673-5697-8

Type

conf

DOI

10.1109/WOCC.2013.6676453

Filename

6676453