Title :
Performance Improvement of OOK Free-Space Optical Communication Systems by Coherent Detection and Dynamic Decision Threshold in Atmospheric Turbulence Conditions
Author :
Wang, Zixiong ; Zhong, Wen-De ; Yu, Changyuan
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
In this letter, we analyze the performance improvement of on-off-keying free-space optical communication systems in atmospheric turbulence conditions due to coherent detection and the dynamic decision threshold (DDT) scheme. Our analytical results show that the DDT scheme provides a 5.7-dB power reduction for achieving a bit error rate of 10-3 compared with the conventional fixed decision threshold scheme. In addition, the improvement achieved by the DDT scheme is related to the strength of amplitude and phase fluctuations, not to the power of the local oscillator.
Keywords :
amplitude shift keying; atmospheric light propagation; atmospheric turbulence; optical links; optical modulation; OOK; amplitude fluctuation; atmospheric turbulence conditions; coherent detection; dynamic decision threshold; free space optical communication systems; on-off keying; phase fluctuation; Adaptive optics; Bit error rate; Coherence; Fading; Optical polarization; Optical receivers; Silicon; Atmospheric turbulence; coherent detection; dynamic decision threshold; free-space optical (FSO);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2218652
