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

doi:10.3390/app11219805

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	Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels
	R. T. Tian; Z. Y. Wu; S. Ma; Y. C. Gu and X. L. Li
	2021
发表期刊	Applied Sciences-Basel
卷号	11 期号:21 页码:12
摘要	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.
DOI	10.3390/app11219805
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收录类别	SCI
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65146
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	R. T. Tian,Z. Y. Wu,S. Ma,et al. Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels[J]. Applied Sciences-Basel,2021,11(21):12.
APA	R. T. Tian,Z. Y. Wu,S. Ma,&Y. C. Gu and X. L. Li.(2021).Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels.Applied Sciences-Basel,11(21),12.
MLA	R. T. Tian,et al."Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels".Applied Sciences-Basel 11.21(2021):12.

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