Title :
Performance of free space optical coherent communication with decision-aided carrier phase estimation
Author :
Xue Liu ; Jian Chen ; Shuchao Zhang
Author_Institution :
Sch. of InfoComm Eng., Nanjing Univ. of Posts & Telecommun., Nanjing, China
Abstract :
The performance of free space optical coherent communication with phase modulation is limited by both phase fluctuations and intensity scintillations induced by atmospheric turbulence. In this paper, we consider the effects of Gaussian phase fluctuations and Gamma-Gamma amplitude fluctuations, in addition to photodiode shot noise. Given temporal correlation of phase variations, decision-aided, maximum likelihood (DA-ML) phase estimator is employed in free space optical coherent communication system to improve system performance. Monte Carlo simulation results show that turbulent phase noise can be ignored with less than 0.1 dB signal-to-noise ratio penalty compared with no turbulence by using this phase estimation scheme. And intensity scintillations are the dominant impairment.
Keywords :
Gaussian noise; Monte Carlo methods; atmospheric turbulence; light coherence; maximum likelihood estimation; optical communication; optical modulation; phase estimation; phase modulation; phase noise; photodiodes; space communication links; DA-ML phase estimator; Gamma-Gamma amplitude fluctuation; Gaussian phase fluctuation; Monte Carlo simulation; atmospheric turbulence; decision-aided carrier phase estimation; decision-aided maximum likelihood phase estimator; free space optical coherent communication performance; intensity scintillation; phase modulation; photodiode shot noise; signal-to-noise ratio penalty; turbulent phase noise; Atmospheric modeling; Bit error rate; Fluctuations; Integrated optics; Phase estimation; Phase noise; Signal to noise ratio; atmospheric turbulence; coherent free space optical; decision-aided maximum likelihood phase estimation;
Conference_Titel :
Optical Communications and Networks (ICOCN), 2015 14th International Conference on
Conference_Location :
Nanjing
DOI :
10.1109/ICOCN.2015.7203725
