Performance analysis of QPSK in free-space optical communications systems over combined channel with phase compensation error
Performance of free-space optical (FSO) links employed quadrature phase shift keying (QPSK) modulation with phase compensation error over Combined Channel is investigated in this paper. By considering the key factors of weather condition, pointing errors 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 in Combined Channel, SER must be the trade off between pointing errors and weather condition, but it suffers more from the weather condition. The effects of pointing errors on system performance are also studied.
free-space optical combined channel phase compensation error symbol error rate hyper-geometric function substitution