Adaptive decision thresholding in optical wireless communication systems over turbulence channels

Jin Wang; Dexiu Huang; Xiuhua Yuan

doi:10.1117/12.743776

19 November 2007 Adaptive decision thresholding in optical wireless communication systems over turbulence channels

Jin Wang, Dexiu Huang, Xiuhua Yuan

Proceedings Volume 6783, Optical Transmission, Switching, and Subsystems V; 67833V (2007) https://doi.org/10.1117/12.743776
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

A model for received signals has been developed for detection of binary data bits in the presence of atmospheric turbulence noise. The model was used to analyze the likelihood ratio test (LRT) according to optimal maximum a posterior (MAP) probability criterion. The adaptive decision thresholding method was developed to maintain the detection threshold near optimum. The detection threshold that was updated adaptively as the signal-to-noise ratio (SNR) was changed. Kalman filter and homomorphic filter were used to predict statistical variable of the bit and turbulence parameters, respectively. Simulation and the experimental results indicate that bit-error probability (BEP) performance of the system is greatly improved by an order of magnitude or more.

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Jin Wang, Dexiu Huang, and Xiuhua Yuan "Adaptive decision thresholding in optical wireless communication systems over turbulence channels", Proc. SPIE 6783, Optical Transmission, Switching, and Subsystems V, 67833V (19 November 2007); https://doi.org/10.1117/12.743776

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KEYWORDS

Turbulence

Filtering (signal processing)

Receivers

Signal to noise ratio

Wireless communications

Adaptive optics

Atmospheric optics

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