Low-Complexity Adaptive Optics Aided Orbital Angular Momentum Based Wireless Communications
Low-Complexity Adaptive Optics Aided Orbital Angular Momentum Based Wireless Communications
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DOI：
10.1109/tvt.2021.3092791
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发表时间：
2021-08
影响因子：
6.8
通讯作者：
Huan Chang;Xiaoli Yin;Haipeng Yao;Jingjing Wang;Ran Gao;Jianping An;L. Hanzo
中科院分区：
文献类型：
--
作者：
Huan Chang;Xiaoli Yin;Haipeng Yao;Jingjing Wang;Ran Gao;Jianping An;L. Hanzo
自适应光学（AO）具有减轻大气湍流影响和改善基于轨道角动量（OAM）的光无线通信（OAM-OWC）链路性能的潜力。在这里，我们提出了一个单一的强度测量相位恢复算法（SPRA）为基础的AO技术补偿的OAM光束的失真。SPRA波前传感器所需的唯一参数是傅立叶域中探测光束的强度，这大大简化了AO系统。我们首先推导出一个解析表达式来描述OAM-OWC链路中探测光束的扩展，然后确定直径约束作为SPRA的先验信息，以保证一定的补偿性能。仿真结果表明，SPRA-AO方法确实可以纠正畸变的OAM光束在单通道的情况下，并在复用的OAM-OWC系统。采用SPRA-AO补偿后，误码率可提高几个数量级。此外，我们建立了基于AO的OAM-OWC系统的噪声模型，并分析了SPRA-AO技术的鲁棒性。总之，本文为声光的应用提供了新的见解，并形成了在OAM-OWC系统中使用探测光束的理论基础。
Adaptive optics (AO) has the potential to mitigate the effect of atmospheric turbulence and improve the performance of orbital angular momentum (OAM)-based optical wireless communication (OAM-OWC) links. Here, we propose a single-intensity-measurement phase retrieval algorithm (SPRA)-based AO technique of compensating for the distortion of the OAM beam. The only parameter required by the SPRA wave-front sensor is the intensity of the probe beam in the Fourier domain, which substantially simplifies the AO system. We first derive an analytical expression to characterize the expansion of probe beam in OAM-OWC links and then determine the diameter constraints as the apriori information of the SPRA required for guaranteeing a certain compensation performance. The simulation results illustrate that the SPRA-AO approach can indeed correct a distorted OAM beam both in a single-channel scenario and in multiplexed OAM-OWC systems. The bit error rate can be improved by orders of magnitude with the aid of SPRA-AO compensation. Furthermore, we establish noise models of AO-based OAM-OWC systems and analyze the robustness of the SPRA-AO technique. In a nutshell, this paper provides new insights for the applications of AO and forms the theoretical basis of employing probe beams in OAM-OWC systems.