Naik Ramavath Prasad, Simha G D Goutham, Krishnan Prabu
Appl Opt. 2021 Oct 10;60(29):9067-9073. doi: 10.1364/AO.435887.
This paper proposes the idea of a new cooperative communication between the Internet of Things (IoT) and the Internet of Underwater Things (IoUT) using wireless optical connectivity for ocean monitoring applications. We considered IoT communication using a hybrid radio frequency (RF)/free space optical (FSO) link and IoUT using a underwater wireless optical communication (UWOC) link. Channel models for RF, FSO, and UWOC links are considered to be Rayleigh, Malaga with pointing errors, and hyperbolic tangent log-normal distributions, respectively. The outage probability and the bit error rate (BER) expressions for the proposed system are derived over the combined channel model, which includes the effects of attenuation, turbulence, and pointing errors. The BER results are plotted for various binary digital modulation schemes such as on-off keying, binary phase-shift keying, binary frequency-shift keying, and differential phase-shift keying over UWOC, hybrid RF/FSO and RF-UWOC, FSO-UWOC with end-to-end systems. BER results are extended for various turbulence regions and pointing errors of the FSO link. Monte Carlo simulation results authenticate the correctness of the results.
本文提出了一种物联网（IoT）与水下物联网（IoUT）之间新型协作通信的构想，该构想利用无线光连接用于海洋监测应用。我们考虑了使用混合射频（RF）/自由空间光（FSO）链路的物联网通信以及使用水下无线光通信（UWOC）链路的水下物联网通信。RF、FSO和UWOC链路的信道模型分别被认为是瑞利分布、存在指向误差的马拉加分布和双曲正切对数正态分布。在所提出的系统的组合信道模型上推导了中断概率和误码率（BER）表达式，该组合信道模型包括衰减、湍流和指向误差的影响。针对各种二进制数字调制方案（如开关键控、二进制相移键控、二进制频移键控和差分相移键控），在UWOC、混合RF/FSO和RF-UWOC、具有端到端系统的FSO-UWOC上绘制了BER结果。针对FSO链路的各种湍流区域和指向误差扩展了BER结果。蒙特卡罗仿真结果验证了结果的正确性。
