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Compensation method and device based on visible light communication system

A technology of visible light communication and compensation method, applied in the field of compensation method and device based on visible light communication system, capable of solving problems such as irreparable imbalance

Active Publication Date: 2020-08-11
YANGZHONG INTELLIGENT ELECTRICAL INST NORTH CHINA ELECTRIC POWER UNIV
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  • Description
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  • Application Information

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Problems solved by technology

Its shortcomings are obvious. Compensating for bit errors caused by LED nonlinearity in the Visble Light Communication (VLC) system cannot compensate for the Inphase-Quadrature (IQ) imbalance caused by LED nonlinearity.

Method used

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  • Compensation method and device based on visible light communication system
  • Compensation method and device based on visible light communication system
  • Compensation method and device based on visible light communication system

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Embodiment Construction

[0029] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the application or uses of the present disclosure. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

[0030] Such as figure 1 shown. A compensation method based on a visible light communication system, the method comprising:

[0031] S101, calculating the average value of the in-phase component and the quadrature component of the four regions in the constellation diagram;

[0032] S102, calculate the compensation angle through a specific formula according to the average value of the in-phase component and the quadrature component; the specific formula is: E(x 1 ), E(x 2 ) are the mean energy values ​​of ...

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Abstract

The present invention discloses a compensation method based on a visible light communication system. The method comprises the steps of: calculating an average value of cophase components and orthogonal components of four regions in a constellation diagram; according to the average value of cophase components and orthogonal components, calculating a compensation angle through a special formula; calculating cophase components and orthogonal components after rotation through a specific algorithm; and regulating the number of compensation times according to the LED nonlinearity degree and the modulation order employed by the system to compensate the error codes caused by nonlinearity. The compensation method and device based on the visible light communication system can perform compensation for the error codes caused by the LED nonlinearity in a Visble Light Communication (VLC) system, and can make up the imbalance of the Inphase-Quadrature (IQ) caused by the LED nonlinearity through rotation of the receiving signal phases.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a compensation method and device based on a visible light communication system. Background technique [0002] For the ISI phenomenon of OFDM optical fiber communication system, it is mainly caused by IQ imbalance. There are mainly two solutions to this phenomenon. In 2008, Irshaad Fatadin and others used the GSOP (Gram-Schmidt Orthogonalization Procedure) algorithm to orthogonalize the non-orthogonal signal Schmidt for the IQ imbalance problem in the coherent optical system modulated by QPSK (Quadrature Phase Shift Keying) deal with. A 10.7Gb / s NRZ (non-return to zero) transmission system is established, and this method is also applicable to polarization multiplexing systems. [0003] In 2010, W Shieh et al. proposed a time-frequency domain hybrid compensation method for the IQ imbalance between the transceiver and the transceiver. [0004] Wherein, the IQ imb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/516H04B10/548H04L27/34
CPCH04B10/116H04B10/516H04B10/548H04L27/34
Inventor 刘鹏郭亚榕
Owner YANGZHONG INTELLIGENT ELECTRICAL INST NORTH CHINA ELECTRIC POWER UNIV
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