Estimation Method of Atmospheric Turbulent Channel Fading Parameters Based on Mixture Distribution Model

A technology of atmospheric turbulence and mixed distribution, which is applied in channel estimation, baseband system components, free space transmission, etc., can solve the problem of error increase, achieve accurate parameter estimation, and solve the effect of error increase

Active Publication Date: 2021-12-07
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for estimating the fading parameters of the atmospheric turbulence channel based on the mixed distribution model, which solves the problem that the error increases when estimating the Gamma-Gamma channel parameters that exist in the prior art

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  • Estimation Method of Atmospheric Turbulent Channel Fading Parameters Based on Mixture Distribution Model
  • Estimation Method of Atmospheric Turbulent Channel Fading Parameters Based on Mixture Distribution Model
  • Estimation Method of Atmospheric Turbulent Channel Fading Parameters Based on Mixture Distribution Model

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[0060] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0061] The method for estimating the fading parameters of the atmospheric turbulence channel based on the mixed distribution model of the present invention is specifically implemented according to the following steps:

[0062] Step 1, establish an atmospheric turbulence channel model, and the light intensity fluctuation probability density function obeys the Gamma-Gamma distribution; where the atmospheric turbulence channel model is specifically:

[0063] I=I x I y

[0064] Among them, I is the received irradiance, I x and I y Produced by large-scale turbulence effects and small-scale turbulence effects, respectively, represented by two independent Gamma distributions:

[0065]

[0066]

[0067] Among them, the parameters α and β represent the large-scale scattering coefficient and the small-scale scattering coefficient respectivel...

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Abstract

The invention discloses a method for estimating fading parameters of an atmospheric turbulent channel based on a mixed distribution model, specifically: Step 1, establishing an atmospheric turbulent channel model, the light intensity fluctuation probability density function obeys Gamma-Gamma distribution; Step 2, calculating Gamma-Gamma Calculate the logarithm of the probability density function of the distribution to obtain the logarithmic likelihood function of θ; Step 3, calculate the logarithmic likelihood function and statistical characteristics of the overall data; Step 4, use the E step of the EM algorithm iteration to calculate the posterior of the hidden variable The test probability, using the M step of the EM algorithm iteration, looking for the next estimated value of α and the next estimated value of β by E step and M step, updating the estimated value of θ continues E step and M step until the previous estimated value and When the difference between the current estimated values ​​is less than the threshold ε, the iteration is stopped. The present invention solves the problem of increasing error when estimating Gamma-Gamma channel parameters existing in the prior art.

Description

technical field [0001] The invention belongs to the technical field of communication technology, and relates to a method for estimating fading parameters of an atmospheric turbulence channel based on a mixed distribution model. Background technique [0002] Free space optical communication (FSO) has the advantages of high data rate, unregulated spectrum, and easy implementation. However, the reliability of FSO communication is greatly affected by the propagation environment. The main factor limiting the communication performance of the system is that the atmospheric turbulence affects the optical signal transmission, which causes the irradiance fluctuation of the received signal, that is, the flickering of the light intensity. Atmospheric turbulence is caused by changes in the refractive index along the propagation path due to changes in temperature and pressure. Among the several probability density functions proposed for the distribution of atmospheric turbulence, the Gam...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/11H04L25/02
CPCH04B10/11H04L25/024
Inventor 陈丹惠佳欣刘塬王慧琴
Owner XIAN UNIV OF TECH
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