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Ber Analysis of Sub-carrier Optical Communication System in Atmospheric Turbulence Channel

Author: HeWenYing
Tutor: MaYong
School: Huazhong University of Science and Technology
Course: Signal and Information Processing
Keywords: Wireless Optical Communication Carrier modulation Intensity flashing Intensity modulation
CLC: TN929.1
Type: Master's thesis
Year: 2009
Downloads: 35
Quote: 0
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Abstract


Wireless optical communication face a huge challenge is how to reduce the atmospheric turbulence channel signal caused flash . The turbulence is caused by the unevenness of the atmospheric temperature and pressure , resulting in the change of the refractive index of the atmosphere . Turbulence caused by the undulation of the amplitude and phase of the received beam . These fluctuations so that the deterioration of the received signal strength , increasing the bit error rate ( BER ) , so that the communication connection interrupt . Study atmospheric random channel characteristics and optical signal transmission channel in the atmosphere is very important , and a great reference value to the design and implementation of wireless laser communication system . Firstly, the course of development and national research status of wireless optical communication application prospects Overview. Then summarize and analyze the effects of atmospheric turbulence of the laser signal , the atmospheric laser carrier communication principle , as well as a variety of modulation of the optical carrier . Given the importance of the error rate of a communication system , the use of laser transmission error rate in the turbulent flow calculation model of the error rate characteristic of a subcarrier modulated optical communication system using different modulation methods . The results show that the light intensity caused by the atmospheric turbulence flashes are the main factors affecting laser wireless communications signal transmission error rate , while the use of intensity-modulated optical communication system carrier BPSK able to overcome the influence of the atmospheric turbulence . Simulation results show that the intensity modulation of the carrier BPSK optical communication system BER characteristics superior OOK modulation and carrier FSK intensity modulation optical communication system . Finally, we discuss an effective way to improve the performance of wireless optical communication system from channel coding , improved model of wireless optical communication system . These theoretical research and the system model to improve the development and application of wireless optical communication system has an important value .

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