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A threshold-based multiple optical signal selection scheme for WDM FSO systems

机译：WDM FSO系统的基于阈值的多光信号选择方案

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摘要

In this paper, we propose a threshold-based-multiple optical signal selection scheme (TMOS) for free-space optical systems based on wavelength division multiplexing. With the proposed TMOS, we can obtain higher spectral efficiency while reducing the potential increase in complexity of implementation caused by applying a selection-based beam selection scheme without a considerable performance loss. Here, to accurately characterize the performance of the proposed TMOS, we statistically analyze the characteristics with heterodyne detection technique over independent and identically distributed Log-normal turbulence conditions taking into considerations the impact of pointing error. Specifically, we derive exact closed-form expressions for the average bit error rate, and the average spectral efficiency by adopting an adaptive modulation. Some selected results shows that the average spectral efficiency can be increased with TMOS while the system requirement is satisfied.
机译：在本文中，我们为基于波分复用的自由空间光学系统提出了基于阈值的多个光信号选择方案（TMOS）。借助提出的TMOS，我们可以在不降低性能的情况下获得更高的频谱效率，同时减少由于应用基于选择的波束选择方案而导致的实现复杂性的潜在增加。在这里，为了准确地表征所提出的TMOS的性能，我们在考虑指向误差的影响的情况下，利用外差检测技术对独立且均匀分布的对数正态湍流条件进行统计分析。具体来说，我们通过采用自适应调制来得出平均误码率和平均频谱效率的精确闭式表达式。一些选定的结果表明，在满足系统要求的同时，使用TMOS可以提高平均频谱效率。

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