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Impact of relay placement in three-hop buffer-aided FSO systems: An approximate performance analysis approach
Physical Communication ( IF 2.2 ) Pub Date : 2021-01-16 , DOI: 10.1016/j.phycom.2021.101276
Mirna El-Rajab , Chadi Abou-Rjeily

In this paper, we consider the problem of three-hop Free Space Optical (FSO) communications in the context of decode-and-forward (DF) buffer-aided (BA) relaying where the two relays are equipped with buffers of finite size. We adopt a Markov chain analysis for evaluating the outage probability (OP) and average packet delay (APD) of the considered serial relaying system that operates naturally in the full-duplex (FD) mode. Given the large number of states involved in the analysis and the large number of associated transitions resulting from the FD operation, we establish an approximate performance analysis approach following from the intractability of an exact analysis. The suggested framework improves over the existing asymptotic studies and provides closed-form approximate OP and APD expressions that are extremely close to the exact expressions in the average-to-high signal-to-noise ratio (SNR) range. Simulations over gamma–gamma atmospheric turbulence channels highlight on the accuracy of the adopted approximate approach irrespective of the underlying network setup. This accuracy is particularly appealing for predicting the APD performance since the gap between the exact APD and the existing asymptotic APD bounds can be huge for FSO networks with comparable hop distances.



中文翻译:

三跳缓冲辅助FSO系统中继电器放置的影响:近似性能分析方法

在本文中,我们考虑了在解码和转发(DF)缓冲区辅助(BA)中继的情况下三跳自由空间光(FSO)通信的问题,其中两个中继都配备了有限大小的缓冲区。我们采用马尔可夫链分析法来评估所考虑的以全双工(FD)模式自然运行的串行中继系统的中断概率(OP)和平均数据包延迟(APD)。考虑到分析中涉及的大量状态以及FD操作导致的大量相关转换,我们根据精确分析的难点建立了一种近似的性能分析方法。所建议的框架对现有的渐近研究进行了改进,并提供了封闭形式的近似OP和APD表达式,这些表达式非常接近平均信噪比(SNR)范围内的精确表达式。γ-γ大气湍流通道上的模拟强调了所采用的近似方法的准确性,而与底层网络的设置无关。这种精确度对于预测APD性能特别有吸引力,因为对于具有可比跳距的FSO网络,精确APD与现有渐近APD边界之间的差距可能很大。

更新日期:2021-01-19
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