M分布星地激光通信链路相干正交频分复用系统误码性能研究

doi:10.11959/j.issn.1000-436x.2020197

通信学报 ›› 2020, Vol. 41 ›› Issue (10): 179-187.doi: 10.11959/j.issn.1000-436x.2020197

M分布星地激光通信链路相干正交频分复用系统误码性能研究

王怡^1,²,王亚萍¹

¹ 中国计量大学信息工程学院，浙江省电磁波信息技术与计量检测重点实验室，浙江杭州 310018
² 成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川成都 610059

修回日期:2020-07-31 出版日期:2020-10-25 发布日期:2020-11-05
作者简介:王怡（1980- ），女，黑龙江哈尔滨人，博士，中国计量大学教授，主要研究方向为自由空间光通信、石油矿山光信息探测、海洋光信息感知等|王亚萍（1995- ），女，河南商丘人，中国计量大学硕士生，主要研究方向为自由空间光通信、星地激光通信
基金资助:
成都理工大学地质灾害防治与地质环境保护国家重点实验室开发基金资助项目(SKLGP2020K017);国家自然科学基金资助项目(51704267)

Research on the system error performance of coherent orthogonal frequency division multiplexing system with M-distribution in satellite-to-ground laser communication

Yi WANG^1,²,Yaping WANG¹

¹ Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province,College of Information Engineering,China JiLiang University,Hangzhou 310018,China
² State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China

Revised:2020-07-31 Online:2020-10-25 Published:2020-11-05
Supported by:
Open Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology)(SKLGP2020K017);The National Natural Science Foundation of China(51704267)

摘要/Abstract

摘要：

为了缓解大气湍流对星地激光通信系统性能的影响，基于 M 分布大气信道模型，在星地激光通信上行链路和下行链路中提出了一种多载波相干正交频分复用（OFDM）调制系统，推导了星地激光通信上行链路和下行链路相干 OFDM 调制系统误码率的闭合表达式。在弱大气湍流和强大气湍流下，分别研究了天顶角、接收孔径、信噪比、最佳束散角以及最佳发射半径与系统误码率的关系，并与二进制相干差分相移键控（DPSK）调制进行比较。理论和仿真对比结果表明，星地激光通信系统中采用相干OFDM调制系统的误码性能优于相干DPSK调制系统。

关键词: 星地激光通信, M分布, 正交频分复用, 光强闪烁, 光束漂移, 到达角起伏

Abstract:

In order to alleviate the influence of atmospheric turbulence on the performance of satellite-to-ground laser communication system,based on the M-distribution atmospheric channel model,a multi-carrier coherent orthogonal frequency division multiplexing (OFDM) modulation system was proposed for uplink and downlink in the satellite-to-ground laser communication.The closed-form expression of bit error rate (BER) of coherent OFDM modulation system was derived.The relationship between the zenith angle,receiving aperture,signal-to-noise ratio (SNR),optimal beam divergence angle,and optimal transmission radius and the BER were studied under weak,and strong atmosphere turbulence,and compared with binary coherent differential phase shift keying (DPSK) modulation.Both the theory and the simulation results show that compared with coherent DPSK modulation,the bit error performance of the coherent OFDM modulation system in the satellite-to-ground laser communication system is better.

Key words: satellite-to-ground laser communication, M-distribution, orthogonal frequency division multiplexing, intensity scintillation, beam wander, angle of arrival fluctuation

中图分类号:

TN929.13

王怡,王亚萍. M分布星地激光通信链路相干正交频分复用系统误码性能研究[J]. 通信学报, 2020, 41(10): 179-187.

Yi WANG,Yaping WANG. Research on the system error performance of coherent orthogonal frequency division multiplexing system with M-distribution in satellite-to-ground laser communication[J]. Journal on Communications, 2020, 41(10): 179-187.

图/表 8

图1

图2

表1

星地激光通信系统仿真参数"

系统参数	符号	取值
卫星地面站高度/km	H	3 600
发射机距地面高度/m	h₀	100
光波长/μm	λ	1.55
传输半径/m	w₀	0.1
接收直径/m	D	0.2
LoS和耦合到LoS散射项的确定相位差	? _A-?_B	$\frac{π}{2}$
天顶角	ζ	30°
OFDM符号周期	T	10
带宽	B	26
子载波数	N	256

表1

图3

图4

图5

图6

图7

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M分布星地激光通信链路相干正交频分复用系统误码性能研究

Research on the system error performance of coherent orthogonal frequency division multiplexing system with M-distribution in satellite-to-ground laser communication

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