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Method for suppressing clipping noise of nonlinear distortion of LED in visible light communication

A non-linear distortion and visible light communication technology, applied in the field of suppressing the nonlinear distortion of visible light communication LEDs, can solve the problems of reducing the average number of symbol decomposition times and BER performance deterioration, to improve the bit error rate performance, reduce noise, reduce The effect of the average number of symbolic decompositions

Inactive Publication Date: 2020-06-23
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for suppressing the nonlinear distortion and clipping noise of LEDs in visible light communication; to solve the O-OFDM symbol decomposition serial transmission system, when the symbol variance is small, the BER performance will decrease as the number of symbol decompositions gradually increases. The problem of deterioration; and the average number of symbol decompositions is reduced, which can save optical power consumption and further improve the system frequency band utilization and information transmission rate

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  • Method for suppressing clipping noise of nonlinear distortion of LED in visible light communication
  • Method for suppressing clipping noise of nonlinear distortion of LED in visible light communication
  • Method for suppressing clipping noise of nonlinear distortion of LED in visible light communication

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[0053] See attached figure 1 , a method for suppressing nonlinear distortion and clipping noise of visible light communication LEDs. The present invention uses only the two most commonly used O-OFDM methods: asymmetric clipped optical OFDM (ACO-OFDM) and DC bias optical OFDM (DCO-OFDM) OFDM) is taken as an example to describe the specific implementation manner, and other O-OFDM modulation methods can be implemented according to this principle. For clarity, variables in lowercase letters represent time-domain signals and uppercase letters represent frequency-domain signals.

[0054] The specific implementation of the sender is:

[0055] (1) Divide the input binary information sequence into data segments, each segment contains log 2 M bits are mapped to an M-order quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) constellation diagram using a Gray code, and X is used to represent a symbol sequence output by the modulator, and the modulation symbol satisfie...

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Abstract

The invention discloses a method for suppressing clipping noise of nonlinear distortion of LED in visible light communication. The method comprises the following main steps: (1) mapping a modulation symbol into a vector signal meeting Hermitian symmetry; (2) performing pre-scale transformation to regulate and control an O-OFDM symbol variance; (3) carrying out adaptive O-OFDM symbol decompositionafter IFFT (Inverse Fast Fourier Transform); repeatedly clipping the amplitude of the symbol according to the clipping threshold and the maximum symbol decomposition frequency; and calculating a decision symbol after each clipping, and judging whether symbol decomposition is required or not; (4) sequentially performing serial framing on the decomposed symbols; (5) splitting a frame after photoelectric conversion, deleting CP, adding all decomposed symbols in one frame bit by bit, and combining the decomposed symbols into an O-OFDM symbol; and (6) extracting information after FFT, and demodulating and recovering original information.

Description

technical field [0001] The invention relates to a method for suppressing nonlinear distortion of LEDs in visible light communication, in particular to a method for suppressing clipping noise caused by nonlinear distortion of LEDs in visible light communication. Background technique [0002] Visible light communication (VLC) is a communication method that uses visible light emitted by ordinary light-emitting diodes (LEDs) as an information carrier to directly transmit optical signals in free space. VLC can provide short-distance, ultra-wideband, and cable-free information exchange. It has the advantages of environmental protection, easy implementation, no electromagnetic interference with traditional radio frequency (RF) communication, security and confidentiality, and is an ideal complementary technology to traditional RF. LED has the advantages of high lighting efficiency, energy saving and environmental protection, higher modulation bandwidth and response sensitivity, and...

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Application Information

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IPC IPC(8): H04B10/116H04B10/50H04B10/69H04L27/26
CPCH04B10/116H04B10/502H04B10/697H04L27/2691
Inventor 贾科军杨博然陆皓魏少博秦翠翠郭慧玲赵金亮李鹍鹏
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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