Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for determining performance of FSO system under weak turbulence condition based on OAM factor

A technology for determining method and system performance, which is applied in the field of wireless optical communication and can solve the problems that mathematical models cannot be directly obtained.

Active Publication Date: 2020-09-25
XIDIAN UNIV
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current problem is that all known statistical distributions of attenuation and crosstalk factors need to be calculated through multiple experiments to obtain PDF parameters. In an environment where turbulent conditions change, existing mathematical models cannot directly obtain accurate PDFs. And there is no report on the statistical model that has a quantitative relationship between the PDF parameters of the OAM factor and the turbulence intensity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining performance of FSO system under weak turbulence condition based on OAM factor
  • Method for determining performance of FSO system under weak turbulence condition based on OAM factor
  • Method for determining performance of FSO system under weak turbulence condition based on OAM factor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] In order to make the purpose, technical solution and advantages of the present invention more clear, the following will further describe in detail in conjunction with the accompanying drawings and specific embodiments. This embodiment only shows the principle description of the present invention, and does not represent any limitation to the present invention.

[0036] The calculation method of the present invention based on atmospheric weak turbulence research turbulence intensity affecting system performance is characterized in that it comprises the following steps:

[0037] Step 1: Based on the atmospheric turbulence transmission model, the OAM factor in the FSO system is calculated by filtering and decomposing the received LG light, and the empirical probability density function is calculated based on the non-parametric estimation of the probability density through multiple simulations.

[0038] Among them, the OAM factor is calculated by the following method:

[00...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for determining the performance of an FSO system under a weak turbulence condition based on an OAM factor, and the method comprises the steps: obtaining an expressionfor calculating the OAM factor based on an atmospheric turbulence transmission model; giving a probability density function of OAM factor statistical distribution in the FSO system, and giving a statistical model of the OAM factor in the FSO system; on the basis of a least square method, giving an optimization problem and an optimization algorithm for solving the statistical model parameters of anOAM factor in the FSO system, solving the statistical model parameters of the OAM factor in the FSO system, and then verifying the reliability of the statistical model of the OAM factor in the FSO system; based on a statistical model of the OAM factor in an FSO system, in combination with a QPSK modulation OAM multiplexing FSO system transmission model, deriving a system bit error rate expression, and comparing influences of different turbulence intensities on system performance. According to the method, probability density function parameters are quantitatively expressed by turbulence intensity, and the method can be suitable for more application environments.

Description

technical field [0001] The invention belongs to the technical field of wireless optical communication, and specifically relates to a method for determining system performance based on a statistical model of an OAM factor quantitatively represented by turbulence intensity in an FSO system under the condition of weak atmospheric turbulence. Background technique [0002] Free Space Optical Communication (FSO Free Space Optical Communication) is a transmission communication technology that uses laser as the carrier and the atmosphere as the transmission medium. Interest in this technology has doubled due to its combination of the high bandwidth of optical communications and the flexibility of wireless technology. Meanwhile, the Orbital Angular Momentum (OAM Orbital Angular Momentum) mode provides a new degree of freedom for light, which can further improve the capacity of communication systems in FSO links. However, the light intensity and phase of the beam can be affected by a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04B10/079H04B10/11G06F17/18
CPCG06F17/18H04B10/07953H04B10/11
Inventor 王平潘宇婷王炜张婷庞维娜李爽
Owner XIDIAN UNIV