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A method and system for reducing the nonlinearity of LED light sources in visible light communication systems

A non-linear and light source technology, applied in short-distance systems, free space transmission, etc., can solve the problems of reducing the nonlinearity and low complexity of the light source LED in visible light communication systems, achieving high reliability, eliminating signal distortion, and ensuring transmission quality effect

Active Publication Date: 2018-03-30
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and system for reducing the nonlinearity of the light source LED of the visible light communication system, so as to solve the problem in the prior art that there is no nonlinearity reduction processing from the transmitted signal itself, and it is only applicable to lower complex system problems

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  • A method and system for reducing the nonlinearity of LED light sources in visible light communication systems
  • A method and system for reducing the nonlinearity of LED light sources in visible light communication systems
  • A method and system for reducing the nonlinearity of LED light sources in visible light communication systems

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Embodiment 1

[0058] see figure 1 As shown, the method for reducing the nonlinearity of the light source LED of the visible light communication system provided by the embodiment of the present invention includes:

[0059] S1: Obtain the signal sequence to be sent;

[0060] S2: Based on a selective mapping algorithm (Selective Mapping, SLM), process the signal sequence to obtain a set of multi-carrier signal sequences with a minimum peak-to-average power ratio (Peak to Average Power Ratio, PAPR);

[0061] S3: converting the multi-carrier signal sequence into a serial signal, and generating a set of marker sequences with the same length as the serial signal;

[0062] S4: If the amplitude of the serial signal is greater than the LED saturation threshold, multiply the multi-carrier signal with an amplitude greater than the LED saturation threshold by the predistortion compression coefficient, and assign a value of 1 to the corresponding position in the marker sequence.

[0063] The method for...

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Abstract

The invention provides a method and system for reducing light source LED nonlinearity in a visible light communication system. According to the method and the system, signal distortion resulting from the nonlinearity characteristic of the LEDs can be eliminated from the sent signals themselves. The method comprises following steps of obtaining to-be-sent signal sequences; processing the signal sequences based on a selective mapping algorithm, thus obtaining a set of multi-carrier signal sequence with the minimum peak-to-average power ratio; converting the multi-carrier signal sequence into serial signals; generating a set of marking sequence with same length to the serial signals; if the amplitude value of the serial signals is more than an LED saturation threshold value, multiplying a pre-distortion compression coefficient by the multi-carrier signals of which amplitude value is more than the LED saturation threshold value; and assigning 1 at corresponding position in the marking sequence. The method and the system are applicable to the technical field of visible light wireless communication.

Description

technical field [0001] The present invention relates to the technical field of visible light wireless communication, in particular to a method and system for reducing the nonlinearity of a light source LED in a visible light communication system. Background technique [0002] With the continuous development of wireless communication technology and lighting technology industry, visible light-emitting diode (LED) wireless communication, as a new technology using white LED for communication, has the advantages of abundant visible light resources, safety and energy saving, large communication capacity, high transmission frequency, and transmission It has the advantages of fast speed, no electromagnetic interference, and no need for radio frequency certificates. Visible light LED wireless communication has good application prospects and occupies an important position and value in the future communication field. Using LED as the light source for indoor visible light communication ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116
CPCH04B10/116
Inventor 严朝雯王建萍史尹嘉
Owner UNIV OF SCI & TECH BEIJING
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