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针对自由空间光通信系统存在的对数正态退化、高信噪比等问题,本文在建立信道退化模型和接收信号模型的基础上,提出了一种闭式次最优最大似然序列检测方法。考虑到该方法平稳点求解过程比较复杂,通过解析近似得出了一种低复杂度的简化算法。与Riediger等人提出的算法相比,本文所述算法参数不随闪烁率的变化而变化;该算法的计算过程比较简单,在很大程度上缩短了计算时间。最后,进行了数值仿真实验。仿真结果表明:本文所提算法与其他序列检测算法相比,具有相似的误码率性能,而且算法消耗的时间较少,说明自由空间光通信的闭式次最优最大似然序列检测方法具有良好的性能和较低的复杂度。
Aiming at the problems of normal logarithm normalization and high signal-to-noise ratio in free space optical communication systems, this paper proposes a closed suboptimal maximum likelihood sequence detection method based on the channel degradation model and the received signal model . Considering that the method of solving the problem of smooth point is complicated, a simplified algorithm of low complexity is obtained by analyzing the approximation. Compared with the algorithm proposed by Riediger et al., The parameters of the proposed algorithm do not change with the flicker rate. The calculation process of the algorithm is relatively simple, and the calculation time is shortened greatly. Finally, numerical simulation experiments are carried out. The simulation results show that the proposed algorithm has similar BER performance compared with other sequence detection algorithms, and the algorithm consumes less time, which shows that closed suboptimal maximum likelihood sequence detection method in free space optical communication has Good performance and low complexity.