水下无线光MIMO链路空间信道建模

Spatial channel modeling for MIMO underwater wireless optical links

水下无线光通信(underwater wireless optical communication,UWOC)因具有高速率、低时延、高灵活性及可拓展性的特点而被广泛应用于水下通信组网的建设。然而,由于海水的吸收和散射效应,UWOC链路的空间特性尚未得到广泛研究,尤其是在多输入多输出(multiple-input multiple-output,MIMO)场景中。考虑了线性阵列MIMO UWOC链路几何模型,提出使用加权指数函数多项式(weighted exponential function polynomial,WEFP)建模具有任意数量光源的通用MIMO UWOC系统链路接收平面的光子辐照度分布的方法。数值结果表明,提出的WEFP模型与浑浊海水环境下的蒙特卡洛仿真结果高度吻合。

Underwater wireless optical communication(UWOC)has been widely used in the construction of under-water communication network for the advantages of high data rates,small latency,high flexibility and scalability.However,due to the absorption and scattering effects of seawater,the spatial characteristics of UWOC links have not been studied extensively,especially in multiple-input multiple-output(MIMO)scenario.A linear array MIMO UWOC link geometry was considered and a weighted exponential function polynomial(WEFP)model was proposed to characterize the photon irradiance distribution at the receiving plane of general MIMO UWOC links with arbitrary numbers of light sources.Numerical results suggest that the proposed WEFP model fits well with the results of Monte Carlo simulations in turbid water environment.