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A closed-form expression for performance optimization of subcarrier intensity QAM signals-based relay-added FSO systems with APD

机译：基于APD的基于子载波强度QAM信号的继电附加FSO系统性能优化的闭式表达式

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摘要

This study characterizes the overall bit-error-rate (BER) performance optimization of avalanche photodiode (APD) receiver-based amplify-and-forward (AF) relay-added free-space optical (FSO) communication system. The system of interest uses subcarrier intensity quadrature amplitude modulation (QAM) signals and subjects to scintillation due to optical turbulence. A weak atmospheric turbulence (clear-air condition) scenario is considered, for which the received signal intensity fluctuation can be modeled as a log-normal random process. A closed-form expression of the overall BER is derived by taking into account the impact of atmospheric loss, turbulence strength, thermal-noise and shot-noise limited conditions. It can be inferred from the numerical results that using AF relay nodes can extend the transmission distance and minimize BER performance of FSO system significantly compared with the direct transmission. Moreover, the selection of APD's gain values is indispensable to minimize the system's BER performance. Hence, the designed system could achieve the minimal BER by selecting an optimal APD gain value appropriately. In addition, the optimal gain values of APD significantly depend on various conditions, such as noise temperature, link distance, and the number of relay nodes. (C) 2018 Elsevier B.V. All rights reserved.
机译：这项研究的特点是基于雪崩光电二极管（APD）接收器的放大转发（AF）中继添加的自由空间光学（FSO）通信系统的总体误码率（BER）性能优化。感兴趣的系统使用子载波强度正交幅度调制（QAM）信号，并由于光学湍流而发生闪烁。考虑到弱的大气湍流（晴空条件）场景，对于该场景，可以将接收信号强度波动建模为对数正态随机过程。通过考虑大气损失，湍流强度，热噪声和散粒噪声限制条件的影响，得出整个BER的闭合形式。从数值结果可以推断，与直接传输相比，使用AF中继节点可以显着延长FSO系统的传输距离并使BER性能最小化。而且，必须选择APD的增益值才能最小化系统的BER性能。因此，所设计的系统可以通过适当选择最佳APD增益值来实现最小BER。另外，APD的最佳增益值很大程度上取决于各种条件，例如噪声温度，链路距离和中继节点的数量。 （C）2018 Elsevier B.V.保留所有权利。

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