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Optical pulse signal simulation generation method influenced by atmospheric turbulence

A technology of atmospheric turbulence and signal simulation, applied in electrical components, electromagnetic wave transmission systems, transmission systems, etc., can solve problems such as random fluctuations in wireless optical communication signal strength and performance degradation of communication systems

Active Publication Date: 2015-04-01
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

Atmospheric turbulence causes random fluctuations in the signal strength of wireless optical communications, which can severely degrade the performance of communications systems

Method used

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  • Optical pulse signal simulation generation method influenced by atmospheric turbulence
  • Optical pulse signal simulation generation method influenced by atmospheric turbulence
  • Optical pulse signal simulation generation method influenced by atmospheric turbulence

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings. In this embodiment, an electro-optic intensity modulator with an extinction ratio of 80 or more is selected, and a semiconductor laser with a wavelength of 808 nm is selected as the laser; the numerical simulation program is written in Matlab.

[0031] The purpose of this method is to provide a method for simulating and generating optical pulse signals affected by atmospheric turbulence, so as to simulate and generate optical pulse signals affected by atmospheric turbulence in a laboratory.

[0032] The technical solution of this method: first, according to the design parameters of the optical communication transmitter using the PPM modulation mode, determine the time-domain waveform of the optical pulse that is not affected by atmospheric turbulence, such as figure 1 As shown, the time-domain waveform of the light pulse that is not affected by atmospheric turbulence is ...

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Abstract

The invention discloses an optical pulse signal simulation generation method influenced by atmospheric turbulence and belongs to the technical field of wireless optical communication of atmospheric channels. The optical pulse signal simulation generation method comprises the following steps: firstly calculating a series of optical pulse discrete time domain waveform data arriving at a receiver by using a multi-random-phase-screen-based optical pulse atmospheric turbulence transmission value simulation method and saving the series of optical pulse discrete time domain waveform data in a computer file; then generating modulation control signals of an electro-optic intensity modulator by a control computer according to the discrete time domain waveform data in the computer file and modulating laser signal intensity so as to simulate and generate the optical pulse signals. Compared with the existing semi-object simulation method, the method is not limited by the physical conditions of transmission distance and atmospheric turbulence parameters; the method is relatively high in flexibility and applicability.

Description

technical field [0001] The invention belongs to the technical field of atmospheric channel wireless optical communication, and relates to an optical pulse signal simulation generation method affected by atmospheric turbulence. Background technique [0002] At present, wireless optical communication is considered to be one of the effective ways to solve the increasingly crowded problem of wireless communication frequency band. Atmospheric turbulence causes random fluctuations in the signal strength of wireless optical communication, which can seriously degrade the performance of the communication system. To this end, a large number of atmospheric turbulence suppression methods have been studied to reduce the negative impact of atmospheric turbulence on wireless optical communication systems. For example, techniques such as adaptive threshold decision and channel coding are used to improve the performance of wireless optical communication systems affected by atmospheric turbu...

Claims

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Application Information

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IPC IPC(8): H04B10/508
Inventor 陈纯毅杨华民任斌蒋振刚娄岩
Owner CHANGCHUN UNIV OF SCI & TECH
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