Diversity detection algorithms in laser communications

作者：Zheng Zheng^*; Li Ning

来源：Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(3): 280-284.

• Diversity detection
• Information sequence
• Laser communications
• Likelihood ratio function
• Marginal distribution

The likelihood ratio function in symbol-by-symbol maximum likelihood detection was calculated with the Monte Carlo method for the atmosphere laser communication systems under the weak turbulence condition. Discrete points were mass-generated according to the marginal distribution for the turbulence-induced fading. Then the accuracy of estimating the diversity performance with a relatively less number of discrete points was discussed. A practical diversity detection algorithm was presented based on an algorithm similar to the likelihood ratio function';s structure and the training sequence. This algorithm was designed to operate without any knowledge of turbulence-induced fading channel in advance. The training sequence introduced in each frame can provide the atmosphere turbulence-fading channel information for the following information sequence';s detection. Simulations were taken, and the results show the validity of this newly introduced algorithm even when strong correlation exists.

• 出版日期2008
• 单位北京大学