Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications

Blue-green laser communication channel of seawater

Author ChangFang
Tutor DongYan
School Huazhong University of Science and Technology
Course Communication and Information System
Keywords Blue-green laser communication Attenuation coefficient modeling Thermocline GEP Up / down channel MC simulation
CLC TN929.1
Type Master's thesis
Year 2011
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Blue-green waters of laser communication channel is a relatively complex channel . Establish a perfect seasonal water channel attenuation model for blue-green laser perpendicular uplink / downlink communication systems research , design and implementation has important theoretical significance and value. This paper focuses on a different channel attenuation material seawater seasons absorption, scattering vertical distribution characteristics , analyzes the thermocline of the attenuation characteristics , and separately for different scenarios up / down channel transmission characteristics of MC simulation, and simulation results and theoretical analysis were compared . First, in the Yellow Sea 340-360N ,1220-1240E range, focused on chlorophyll, yellow substance and suspended sand concentration distributions seasons , was established based on the mass concentration of media vertical distribution models as well as the Four Seasons Four Seasons absorption Mie scattering perpendicular distribution model . Secondly, the analysis of the seasonal thermocline presence of seawater channel attenuation characteristics , based on improved gene expression programming (GEP) to achieve the internal waters of the thermocline vertical distribution of the attenuation coefficient model Seasons automatic modeling and with the traditional curve fitting algorithm : MATLAB curve Fitting Toolbox (cftool), improved genetic algorithm for comparison. Finally , using the Monte Carlo method to simulate the different seasons of the blue-green laser scene in seawater and atmospheric uplink and downlink transmission , received a spot for statistical analysis, verified by theoretical analysis of the simulation accuracy.

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