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

Abstract

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

CLC Number:

TN929.13

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.

Figures/Tables 8

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

References 24

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