Light orthogonal frequency division multiplexing adaptive iteration symbol amplitude limiting method for visible light communication

An adaptive iterative, visible light communication technology, applied in multi-frequency code systems, free space transmission, short-distance systems, etc., to achieve the effects of reducing the number of average symbol decompositions, saving optical power, and improving optical power efficiency

Pending Publication Date: 2021-10-08
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Compared with the SDST system, although the information transmission rate has been improved, it is still less than the iterative signal clipping method

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  • Light orthogonal frequency division multiplexing adaptive iteration symbol amplitude limiting method for visible light communication
  • Light orthogonal frequency division multiplexing adaptive iteration symbol amplitude limiting method for visible light communication
  • Light orthogonal frequency division multiplexing adaptive iteration symbol amplitude limiting method for visible light communication

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Embodiment Construction

[0029]The present invention proposes an adaptive iterative symbol clipping (Adaptive Iterative Symbol Clipping, AISC) method of optical OFDM for visible light communication. The O-OFDM symbols are subjected to adaptive iterative symbol clipping, and then the obtained multiple O-OFDM symbols are transmitted to multiple LEDs. Adaptive iterative symbol clipping is the process of repeated clipping of O-OFDM symbols according to their amplitude and clipping threshold. This method can solve the problem that the BER performance deteriorates with the increase of symbol decomposition times when the symbol variance of the traditional ISC method and SDST system is small, and also improves the optical power efficiency and frequency band utilization. At the same time, the problem of low information transmission rate of SDST system and ASDST system is also solved.

[0030] The present invention is an adaptive iterative symbol clipping method of optical orthogonal frequency division multipl...

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Abstract

The invention discloses a light orthogonal frequency division multiplexing adaptive iteration symbol amplitude limiting method for visible light communication and belongs to the field of visible light communication. The method comprises the following steps: adding an adaptive iteration symbol amplitude limiting module between a parallel-serial conversion module and a cyclic prefix adding module at a sending end, carrying out time domain O-OFDM symbol amplitude limiting decomposition, judging whether the symbol amplitude limiting needs to be continued or not every time when the symbol amplitude limiting is carried out till the symbols are completely decomposed; and simultaneously inputting a plurality of generated decomposition symbols into a plurality of LEDs in parallel to emit light. An adaptive iterative symbol decomposition mechanism is introduced to eliminate all-zero symbols, so that the bit error rate performance and the optical power efficiency are improved.

Description

technical field [0001] And visible light communication optical OFDM technology, especially related to visible light communication optical OFDM iterative symbol clipping technology. Background technique [0002] With the rapid development of light-emitting diode (Light Emitting Diode, LED) lighting technology, visible light communication (Visible Light Communication, VLC), as a wireless communication method that uses LED lights to send data, has become a radio frequency (radio frequency, RF) communication A promising complementary technology in short-range communications. VLC uses light in the visible light band (wavelength 380-780nm) as an information carrier to transmit data while providing lighting. Its communication bandwidth is almost unlimited, and it also has the advantages of environmental protection, not easy to be eavesdropped, and no electromagnetic interference with RF communication. . VLC can provide ultra-broadband cable-free green communication in special are...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04L27/26
CPCH04B10/116H04L27/2601
Inventor 贾科军秦翠翠蔺莹彭铎郭慧玲赵金亮王佳宁雷蕾南钰桐李鹍鹏
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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