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Optical wireless communication through fog in the presence of pointing errors

机译：在存在指向错误的情况下通过雾进行光学无线通信

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Terrestrial optical wireless communication (OWC) is emerging as a promising technology, which makes connectivity possible between high-rise buildings and metropolitan and intercity communication infrastructures. A light beam carries the information, which facilitates extremely high data rates. However, strict alignment between the transmitter and the receiver must be maintained at all times, and a pointing error can result in a total severance of the communication link. In addition, the presence of fog and haze in the propagation channel hampers OWC as the small water droplets scatter the propagating light. This causes attenuation due to the resultant spatial, angular, and temporal spread of the light signal. Furthermore, the ensuing low visibility may impede the operation of the tracking and pointing system so that pointing errors occur. We develop a model of light transmission through fogs of different optical densities and types using Monte Carlo simulations. Based on this model, the performance of OWC in fogs is evaluated at different wavelengths. The handicap of a transceiver pointing error is added to the model, and the paradoxically advantageous aspects of the transmission medium are exposed. The concept of a variable field of view receiver for narrow-beam OWC is studied, and the possibility of thus enhancing communication system performance through fog in an inexpensive and simple way is indicated.
机译：陆地光学无线通信（OWC）成为一种有前途的技术，它使高层建筑与城市和城市间通信基础设施之间的连接成为可能。光束携带信息，这有助于极高的数据速率。但是，必须始终保持发射器和接收器之间严格的对准，并且指向错误可能会导致通信链路的整体中断。另外，由于小水滴散射了传播的光，因此传播通道中雾和霾的存在会阻碍OWC。由于光信号的最终空间，角度和时间扩展，这会导致衰减。此外，随之而来的低可见性可能阻碍跟踪和指向系统的操作，从而发生指向错误。我们使用蒙特卡洛模拟法开发了一个通过不同光密度和类型的雾的光传输模型。基于此模型，可以在不同波长下评估OWC在雾中的性能。收发器指向错误的障碍被添加到模型中，并且传输介质的矛盾之处也暴露出来。研究了用于窄束OWC的可变视场接收机的概念，并指出了以廉价和简单的方式通过雾提高通信系统性能的可能性。

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    《Applied optics》 |2003年第24期|共9页
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  • 正文语种 eng
  • 中图分类 光学;
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