High‐order pulse modulations in free space optics (FSO) communication are of practical value, and non‐Kolmogorov gamma–gamma (GG) channel model is the most suitable for FSO channel. However, research on a system combined with the above is rarely reported. In our work, we propose high‐order (4*32 and 4*64) amplitude and pulse position modulation (APPM) and overlapping amplitude and pulse position modulation (AOPPM) FSO communication system under a modified non‐Kolmogorov GG turbulent channel model. Simulation results present that AOPPM is obviously better than APPM in bit‐error‐rate (BER) performance, and BER performance grows with the increase of modulation order (number of pulse positions). The proposed schemes may provide a reference for system design and practical application.

中文翻译：

---

非Kolmogorov伽马-伽马通道FSO通信的高阶APPM和AOPPM的误码率性能

自由空间光学（FSO）通信中的高阶脉冲调制具有实用价值，非Kolmogorov伽玛-伽玛（GG）信道模型最适合FSO信道。然而，很少有关于结合以上所述的系统的研究。在我们的工作中，我们提出了在改进的非Kolmogorov GG湍流通道模型下的高阶（4 * 32和4 * 64）幅度和脉冲位置调制（APPM）以及重叠幅度和脉冲位置调制（AOPPM）FSO通信系统。仿真结果表明，AOPPM在误码率（BER）性能方面明显优于APPM，并且BER性能随着调制阶数（脉冲位置数量）的增加而增长。所提出的方案可以为系统设计和实际应用提供参考。