Differential signalling in free-space optical communication systems
Differential signalling in free-space optical communication systems
复制标题
DOI：
10.3390/app8060872
复制
发表时间：
2018-05
期刊：
影响因子：
--
通讯作者：
M. M. Abadi-M.;Zabih Ghassemlooy;M. Bhatnagar;S. Zvánovec;M. Khalighi;M. Lavery
中科院分区：
文献类型：
--
作者：
M. M. Abadi-M.;Zabih Ghassemlooy;M. Bhatnagar;S. Zvánovec;M. Khalighi;M. Lavery
本文回顾了差分信令技术，并研究了它在自由空间光通信系统中的实现。本文是我们以前工作的扩展版本，其中分别研究了背景噪声、弱湍流和指向误差(PES)的影响。在这里，我们第一次提出了包括综合效应的差动信令方案的详细描述。首先，我们将差分信号的分析推广到中到强大气湍流的情况。接下来，我们研究了一种更一般的情况，其中同时考虑了通道湍流和PES。我们给出了最优检测门限和平均误码率的封闭表达式，并给出了一组数值结果来说明所提出的差分信令在不同的湍流和PES条件下所提供的性能改善。
In this paper, we review the differential signalling technique and investigate its implementation of in free-space optical (FSO) communication systems. The paper is an extended version of our previous works, where the effects of background noise, weak turbulence and pointing errors (PEs) were investigated separately. Here, for the first time, we present a thorough description of the differential signalling scheme including for combined effects. At first, we present an extension of the analysis of differential signalling to the case of moderate to strong atmospheric turbulence. Next, we investigate a more general case where both channel turbulence and PEs are taken into consideration. We provide closed-form expressions for the optimal detection threshold and the average bit-error-rate, and present a set of numerical results to illustrate the performance improvement offered by the proposed differential signalling under various turbulence and PEs conditions.