水下无线光通信抗湍流调制技术

Anti turbulence modulation technology for underwater wireless optical communication

针对水下无线光通信中由于湍流影响导致的光强闪烁及接收端光功率抖动问题,提出了一种基于广义伽马分布(GGD)模型的水下无线光通信准相干通信方法。该方法通过调节光源电流来实现光的强度调制,并使用调制信号对正弦载波的频率进行调制。通过仿真分析,研究了不同强度的水下湍流对光强信号频率的影响,并验证了准相干通信方法在抵抗湍流方面的能力。仿真结果表明:该方法能够在不同的湍流强度条件下有效地抑制光功率的波动,显著降低误码率;在强湍流环境中,误码率可以降至5.25×10^(-5)。

A quasi coherent communication method for underwater wireless optical communication based on the generalized Gamma distribution(GGD)model is proposed to address the issues of light intensity flicker and power jitter at the receiving end caused by turbulence in underwater wireless optical communication.This method achieves intensity modulation of light by adjusting the current of the light source,and modulates the frequency of the sine wave carrier using the modulation signal.Through simulation analysis,the influence of different intensities of underwater turbulence on the frequency of light intensity signals is studied,and the ability of quasi coherent communication methods to resist turbulence is verified.The simulation results show that this method can effectively suppress the fluctuation of optical power and significantly reduce the bit error rate under different turbulence intensity conditions.In strong turbulent environments,the bit error rate can be reduced to 5.25×10^(-5).