Underwater wireless optical communication (UWOC) has attracted considerable attention as a technology with high data rates and low time delays. However, the light scattering in water spreads beam pulse temporally, thereby resulting in time-varying underwater optical channels with inter-symbol interference (ISI) especially when the data rate is very high. To overcome this problem, in this letter, a multi-carrier autoencoder (AE) is proposed to incorporate the direct current optical orthogonal frequency-division multiplexing (DCO-OFDM) scheme into the AE network. In this way, proper constellation mapping and demapping schemes can be learned to cooperate with the DCO-OFDM modulation and the DC bias can be adaptively adjusted, efficiently dealing with the time-varying diffuse channel. The simulation results indicate that the proposed multi-carrier AE can achieve superior performance compared with other state-of-the-art techniques.

中文翻译：

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基于多载波自编码器的宽带水下无线光通信

水下无线光通信（UWOC）作为一种具有高数据速率和低时延的技术引起了相当多的关注。然而，水中的光散射会在时间上传播光束脉冲，从而导致具有符号间干扰 (ISI) 的时变水下光学通道，尤其是在数据速率非常高时。为了克服这个问题，在这封信中，提出了一种多载波自动编码器 (AE)，将直流光正交频分复用 (DCO-OFDM) 方案结合到 AE 网络中。通过这种方式，可以学习适当的星座映射和解映射方案以配合 DCO-OFDM 调制，并且可以自适应地调整 DC 偏置，从而有效地处理随时间变化的漫射信道。