Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels

Probabilistic shaping (PS) is a promising technique to approach the Shannon limit. In this paper, we design a practical coded modulation scheme based on PS to improve the capacity of coherent free-space optical (FSO) links with quadrature amplitude modulation (QAM), where the fading channel follows...

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Autores principales:	Ruotong Tian, Zhiyong Wu, Shuang Ma, Yucong Gu, Xueliang Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	probabilistic shaping gamma-gamma channel pairwise error probability Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/74e3e0e10980484ba6224cd4df4ff95c
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spelling	oai:doaj.org-article:74e3e0e10980484ba6224cd4df4ff95c2021-11-11T14:57:23ZDesign and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels10.3390/app112198052076-3417https://doaj.org/article/74e3e0e10980484ba6224cd4df4ff95c2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9805https://doaj.org/toc/2076-3417Probabilistic shaping (PS) is a promising technique to approach the Shannon limit. In this paper, we design a practical coded modulation scheme based on PS to improve the capacity of coherent free-space optical (FSO) links with quadrature amplitude modulation (QAM), where the fading channel follows the Gamma-Gamma distribution. The aim of this paper is to optimize the probability mass function (PMF) of the QAM signal points to achieve the maximum channel capacity. Due to the complexity of the objective function, the heuristic algorithm was employed to solve the optimization problem. To the best of the authors’ knowledge, the closed-form pairwise error probability (PEP) is first derived with the non-uniform signals under the turbulence channel. In addition, we measure the average symbol error rate (SER) and post-FEC bit error rate (BER) by the Monte Carlo simulation method. The numerical simulation results of both capacity and BER show that the proposed PS scheme is better than the uniform distribution. The post-FEC BER results show that the proposed PS scheme provides significant gains compared with the uniform scheme.Ruotong TianZhiyong WuShuang MaYucong GuXueliang LiMDPI AGarticleprobabilistic shapinggamma-gamma channelpairwise error probabilityTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9805, p 9805 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	probabilistic shaping gamma-gamma channel pairwise error probability Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	probabilistic shaping gamma-gamma channel pairwise error probability Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Ruotong Tian Zhiyong Wu Shuang Ma Yucong Gu Xueliang Li Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels
description	Probabilistic shaping (PS) is a promising technique to approach the Shannon limit. In this paper, we design a practical coded modulation scheme based on PS to improve the capacity of coherent free-space optical (FSO) links with quadrature amplitude modulation (QAM), where the fading channel follows the Gamma-Gamma distribution. The aim of this paper is to optimize the probability mass function (PMF) of the QAM signal points to achieve the maximum channel capacity. Due to the complexity of the objective function, the heuristic algorithm was employed to solve the optimization problem. To the best of the authors’ knowledge, the closed-form pairwise error probability (PEP) is first derived with the non-uniform signals under the turbulence channel. In addition, we measure the average symbol error rate (SER) and post-FEC bit error rate (BER) by the Monte Carlo simulation method. The numerical simulation results of both capacity and BER show that the proposed PS scheme is better than the uniform distribution. The post-FEC BER results show that the proposed PS scheme provides significant gains compared with the uniform scheme.
format	article
author	Ruotong Tian Zhiyong Wu Shuang Ma Yucong Gu Xueliang Li
author_facet	Ruotong Tian Zhiyong Wu Shuang Ma Yucong Gu Xueliang Li
author_sort	Ruotong Tian
title	Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels
title_short	Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels
title_full	Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels
title_fullStr	Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels
title_full_unstemmed	Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels
title_sort	design and performance analysis of probabilistically shaped qam signals for coherent fso systems with gamma-gamma turbulence channels
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/74e3e0e10980484ba6224cd4df4ff95c
work_keys_str_mv	AT ruotongtian designandperformanceanalysisofprobabilisticallyshapedqamsignalsforcoherentfsosystemswithgammagammaturbulencechannels AT zhiyongwu designandperformanceanalysisofprobabilisticallyshapedqamsignalsforcoherentfsosystemswithgammagammaturbulencechannels AT shuangma designandperformanceanalysisofprobabilisticallyshapedqamsignalsforcoherentfsosystemswithgammagammaturbulencechannels AT yuconggu designandperformanceanalysisofprobabilisticallyshapedqamsignalsforcoherentfsosystemswithgammagammaturbulencechannels AT xueliangli designandperformanceanalysisofprobabilisticallyshapedqamsignalsforcoherentfsosystemswithgammagammaturbulencechannels
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Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels

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