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Low-complexity visible light communication system and method based on PAM-DMT modulation

A PAM-DMT, visible light communication technology, applied in multi-frequency code systems, short-range systems, sustainable communication technologies, etc., can solve the problems of high complexity, high peak-to-average power ratio, and nonlinear distortion of visible light communication systems , to avoid noise removal, reduce complexity, and reduce PAPR

Pending Publication Date: 2022-08-02
JIANGNAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of high complexity and high peak-to-average power ratio in the visible light communication system that is prone to nonlinear distortion, the present invention provides a low-complexity visible light communication system based on PAM-DMT modulation. The visible light communication The system includes a transmitting end and a receiving end, and the transmitting end and the receiving end are connected through a VLC optical channel;

Method used

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  • Low-complexity visible light communication system and method based on PAM-DMT modulation
  • Low-complexity visible light communication system and method based on PAM-DMT modulation
  • Low-complexity visible light communication system and method based on PAM-DMT modulation

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Embodiment 1

[0096] This embodiment provides a low-complexity visible light communication system based on PAM-DMT modulation, including a transmitter and a receiver, and the transmitter and receiver are connected through a VLC optical channel;

[0097] The transmitter includes: a data distributor, a PAM-DMT modulation module, a transmission digital-to-analog converter, and an LED; wherein, the data distributor, the PAM-DMT modulation module, the transmission digital-to-analog converter, and the LED are in sequence connect;

[0098] The receiving end includes: an optoelectronic converter, a receiving analog-to-digital converter, a PAM-DMT demodulation module, and a data combiner; wherein, the optoelectronic converter, the receiving analog-to-digital converter, the PAM-DMT demodulation module, and the The data combiners are connected in sequence.

[0099] The PAM-DMT modulation module includes: a first PAM-DMT modulator, a second PAM-DMT modulator, and a third PAM-DMT modulator are connecte...

Embodiment 2

[0140] This embodiment provides a visible light communication method, including the following steps:

[0141] Step 1: The data D to be sent is calculated and divided into a first group of data D1, a second group of data D2, and a third group of data D3. The first group of data D1 first passes through the first PAM-DMT modulator to form a frequency domain. Signal Y 1 , and then perform N / 2-point inverse fast Fourier transform to obtain the time domain signal y 1,n , followed by y 1,n Carry out the signal construction process to obtain the time domain signal t 1,n ; The second group of data D2 first passes through the second PAM-DMT modulator to form a frequency domain signal Y 2 , and then perform N / 2-point inverse fast Fourier transform to obtain the time domain signal y 2,n , followed by y 2,n Carry out the signal construction process to obtain the time domain signal t 2,n ; The third group of data D3 first passes through the third PAM-DMT modulator to form a frequency ...

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Abstract

The invention discloses a low-complexity visible light communication system and method based on PAM-DMT modulation, and belongs to the technical field of wireless optical communication. The optical communication system comprises a transmitting end and a receiving end, the transmitting end and the receiving end are connected through a VLC optical channel, data are grouped, a real part and an imaginary part of a subcarrier resource are modulated respectively, and the modulated signals are constructed by using different properties, so that the optical communication efficiency is improved. Inverse fast Fourier transform with a small number of times is used, so that the complexity of a transmitting end is obviously reduced; the receiving end can perform time domain processing and reconstruction operation on the to-be-demodulated signal according to the characteristics constructed by different signals of the transmitting end, and then directly performs signal demodulation, so that the operation of removing noise is avoided in the receiving end, and the complexity of the receiving end of the system is greatly reduced; compared with a traditional visible light communication modulation method, the peak-to-average power ratio is obviously reduced, and the system performance is obviously improved.

Description

technical field [0001] The invention relates to a low-complexity visible light communication system and method based on PAM-DMT modulation, and belongs to the technical field of wireless optical communication. Background technique [0002] In visible light communication, the combination of LED lighting devices used in daily life and information transmission technology solves the problem of tight spectrum resources in radio frequency, and this technology has the advantages of high speed, high confidentiality and abundant spectrum resources. Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology that can resist multipath fading and inter-symbol interference during signal transmission. Because of its unique advantages, it is widely used in visible light communication. middle. [0003] Intensity Modulation Direct Detection (IM / DD) technology has been widely used in visible light communication, so the signal transmitted in the visib...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/54H04L27/26
CPCH04B10/116H04B10/54H04L27/2614H04L27/2628Y02D30/70
Inventor 李正权洪焕东关少义马可
Owner JIANGNAN UNIV
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