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     Advance Journal of Food Science and Technology

Research Article   |   OPEN ACCESS

Phase Modulation Schemes in Food Free Space Optical Coherent System

1, 2Huiying Zhang, 1Hongzuo Li, 1Xiao Dongya and 1Cai Chao`
1Institute of Space Optical Communication, Changchun University of Science and Technology, Changchun
2College of Information and Control Engineering, Jilin Institute of Chemical Technology, Jilin, China
Advance Journal of Food Science and Technology  2016  5:367-374
http://dx.doi.org/10.19026/ajfst.11.2643  |  © The Author(s) 2016
Received: July ‎24, ‎2015  |  Accepted: August ‎20, ‎2015  |  Published: June 15, 2016
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Abstract

In this study, it is the most appropriate modulation format for food free space optical (FFSO) system compared with other modulation schemes. Performance of BER for BPSK, DPSK and QPSK has been detail discussed under Gamma-Gamma turbulent channel with intensity scintillation and phase fluctuations. The closed average BER expression and channel capacity expression have been derived by adopting the method of generalized hypergeometric. From experiments show that BER and transmission power degraded seriously for the three kinds of modulation format owing to intensity scintillation and phase fluctuations. Comparing performance of the three modulation methods under the atmospheric turbulence, the results for the performance of BPSK and QPSK almost unanimously, in the case of an given SNR it is obvious that BPSK with lower BER. Therefore, BPSK modulation has a good BER and effective resist turbulent but the transmission power will not be increased.

Keywords:

Coherent detection, food free space optical, phase fluctuation,

References