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Visible light communication method based on QAM and MPPM and system thereof

A visible light communication and baseband system technology, applied in the field of dual modulation technology, can solve the problems of rate-limited phosphor response time, limiting system data transmission rate, limiting system communication distance, etc.

Inactive Publication Date: 2015-12-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If white light communication is used, the rate is limited by the response time of the phosphor powder, which limits the data transmission rate of the system; if a filter is used to filter out the yellow light and communicate with fast-responding blue light, the communication distance of the system is limited

Method used

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  • Visible light communication method based on QAM and MPPM and system thereof
  • Visible light communication method based on QAM and MPPM and system thereof
  • Visible light communication method based on QAM and MPPM and system thereof

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Embodiment

[0052] Such as figure 1 As shown, a visible light communication system implementing a visible light communication method based on QAM and MPPM includes: a transmitting subsystem, a transmitting subsystem and a receiving subsystem. In the transmitting subsystem, the data streams are encoded separately, interleaved, serial-to-parallel conversion and other preprocessing of the baseband system form a binary code stream; the binary code stream is modulated by the QAM modulation module and the MPPM modulation module respectively, and then passed through the LED drive circuit. Drive LED lamps to emit light signals.

[0053] Such as Figure 2a Shown is the block diagram of the QAM modulation module. The data stream is preprocessed by the baseband system such as conventional encoding, interleaving, and serial-to-parallel conversion to form a binary code stream; the binary code stream outputs two parallel codes through a serial / parallel converter. stream sequence; the rate of the two...

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PUM

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Abstract

The invention discloses a visible light communication method based on QAM and MPPM. The method comprises the following steps: 1, a data stream forms a QAM signal; 2, the data stream performed with multi-pulse position modulation to form an MPPM signal; 3, the QAM signal controls an LED driving voltage to regulate and control a light intensity amplitude; the MPPM signal controls the on-off of LED driving current; 4, a blue light receiving passage and a yellow light receiving passage exist in a receiving subsystem; 5, the MPPM signal and the QAM signal are decoded to form corresponding binary data streams; and the binary data streams form a final obtained signal through a data combiner. The invention further discloses a visible light communication system for achieving the visible light communication method based on QAM and MPPM. The visible light communication system comprises a transmitting subsystem, a transmission subsystem and the receiving subsystem. The transmission rate of the visible light communication system is effectively improved.

Description

technical field [0001] The present invention relates to visible light communication technology, in particular to a visible light communication method of QAM and MPPM and its system. The present invention is a dual modulation technology combining quadrature amplitude modulation technology and multi-pulse position modulation technology and a method for realizing data transmission and reception . Background technique [0002] In recent years, semiconductor lighting technology known as "green lighting" has developed rapidly. LED has the advantages of high efficiency, low price, long life, green environmental protection, etc. It will replace traditional lighting sources such as incandescent lamps, and is widely used in lighting, display and other fields. At the same time, white LEDs have the characteristics of good modulation performance and high response sensitivity, and can load signals to LED lamps for transmission at high frequencies that cannot be recognized by human eyes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/524
Inventor 文尚胜关伟鹏张恒胡卉馨
Owner SOUTH CHINA UNIV OF TECH