Research on Impulse Response Characteristics of Underwater NLOS Wireless Optical Communication Transmission Channels

Non-line-of-sight underwater wireless optical communication uses light scattering for transmission, which can alleviate the alignment requirements of line-of-sight underwater wireless optical communication. The impulse response can well reflect the channel performance of the underwater wireless optical communication system. In this paper, an improved non-line-of-sight under-water wireless optical communication transmission channel model based on the pointing probability method is proposed. Based on this model, the effects of different seawater environments, different transceiver distances, and different wavelengths on impulse response are simulated. The simulation results show that the pulse broadening effect decreases with the increase of light wavelength, seawater turbidity, and transmission distance. The proposed non-line-of-sight transmission model provides an accurate and realistic method for channel feature description of under-water non-line-of-sight wireless optical communication, which has a certain reference value for analyzing and developing an effective underwater wireless optical communication system.