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Demodulation method and device

A demodulation method and technology for modulating signals, applied in the field of space optical communication, can solve problems such as low demodulation accuracy

Active Publication Date: 2019-11-01
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a demodulation method and device to solve the problem of low demodulation accuracy

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Embodiment Construction

[0080] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0081] The embodiment of the present invention discloses a method for demodulating orbital angular momentum, which will be described in detail below.

[0082] see figure 1 , figure 1 It is a schematic flowchart of a demodulation method provided by an embodiment of the present invention, and the method includes the following steps 101-103.

[0083] Step 101, obtain the OAM intensity map of the received modulated signal as the intensity map to be...

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Abstract

The embodiment of the invention provides a demodulation method, and relates to the technical field of space optical communication, and the method comprises the steps: obtaining an orbital angular momentum OAM intensity graph of a received modulation signal, and taking the orbital angular momentum OAM intensity graph as a to-be-recognized intensity graph; inputting the to-be-identified intensity graph into a pre-trained OAM mode identification model, identifying an OAM mode based on which the modulation signal is obtained, the first initial model of the OAM mode identification model being a model obtained by modifying the number of fully connected layer neurons of a discrimination network model, the discrimination network model being a model obtained by training in combination with a generation network model; and demodulating the modulation signal according to the identified OAM mode. When the scheme provided by the embodiment of the invention is applied to signal demodulation, the demodulation accuracy can be higher.

Description

technical field [0001] The present invention relates to the technical field of space optical communication, in particular to a demodulation method and device. Background technique [0002] Space optical communication can improve spectrum utilization efficiency, increase communication capacity, and meet people's increasing demand for information. In space optical communication, the traditional OAM (Orbital Angular Momentum, orbital angular momentum) demodulation method is: obtain the hologram of the received modulated signal, load the obtained hologram on the holographic phase screen, and according to the The position of the bright spot and the orthogonality of the OAM mode determine the OAM mode on which the received modulated signal is obtained, and then demodulate the received modulated signal according to the determined OAM mode. Although signal demodulation can be realized by applying the above method, the above demodulation method needs to use physical instruments such...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/516H04B10/548G06N3/04
CPCH04B10/516H04B10/548G06N3/045
Inventor 田清华忻向军张琦李哲刘博李良川田凤常天海王拥军王光全杨雷静卢琛达王阔
Owner BEIJING UNIV OF POSTS & TELECOMM