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Generalized dimming control method based on multi-LED visible light communication system

A technology of visible light communication and dimming control, which is applied in the field of generalized dimming control, and can solve problems such as the reduction of system energy efficiency

Active Publication Date: 2019-11-19
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, with the increase in the number of LEDs in a multi-LED VLC system, the problem of reduced energy efficiency of the system cannot be ignored

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Embodiment Construction

[0075] In order to enable those skilled in the art to understand and implement the present invention more clearly, the technical solutions of the embodiments of the present invention will be described in detail below in the form of specific embodiments in conjunction with the accompanying drawings.

[0076] The present invention is based on a multi-LED visible light communication system, and its system realization block diagram is as follows figure 1 As shown, the data bit stream is serial-to-parallel converted into multiple groups of data blocks, and each data block is divided into two parts, one part is mapped to the activation index vector of the space-time matrix, and the other part is modulated into M-PAM symbols. After linear transformation, the two parts of information are combined to obtain a space-time matrix, and then the space-time matrix is ​​mapped to the LED array and converted into an optical signal, which is transmitted through an optical channel. The PD at the ...

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Abstract

The invention discloses a generalized dimming control method based on a multi-LED visible light communication system, and belongs to the field of wireless communication. The generalized dimming control method includes the steps: firstly, constructing a hybrid dimming module is constructed, initializing the number of space-time matrix activation elements, converting source bit information into a plurality of data blocks in a serial-parallel mode, mapping each data block into a space-time matrix, and transmitting the information through a visible light communication channel with the space-time matrix as a unit; calculating a direct current gain of the user channel matrix, and detecting and demodulating an electric signal receiving matrix obtained by conversion of the optical detector througha maximum likelihood detector; and calculating a joint boundary of corresponding system bit error rates when different numbers of elements are activated in the space-time matrix, and determining an optimal value of the number of the activation elements of the space-time matrix by taking the minimum bit error rate of the system as an optimization target and taking the dimming level and the spectral efficiency as constraint conditions. The generalized dimming control method effectively considers communication and lighting functions of the visible light communication system, can effectively improve the energy efficiency of the system, and can enhance the bit error rate performance of the system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a generalized dimming control method based on a multi-LED visible light communication system. Background technique [0002] In recent years, a new generation of green lighting sources, Light Emitting Diodes (LEDs), which have the advantages of long life, high humidity resistance, and low power consumption, are gradually replacing traditional incandescent and fluorescent lamps. LED lighting technology not only has the advantages of energy saving, but also promotes the development of Visible Light Communications (VLC). VLC uses LEDs to emit high-speed modulated light wave signals that are invisible to the naked eye to modulate and transmit information. Compared with traditional radio frequency wireless communication, VLC has the characteristics of rich spectrum resources, no electromagnetic interference, high security, wide coverage and can realize lighti...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/50H04B10/516H04B10/524H04B10/54H04B10/60
CPCH04B10/116H04B10/502H04B10/5161H04B10/524H04B10/541H04B10/60
Inventor 杨洋王聪聪冯春燕刘传宏郭彩丽
Owner BEIJING UNIV OF POSTS & TELECOMM
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