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Visible light local area network duplex communication method

A duplex communication and visible light technology, applied in the field of visible light communication, can solve problems such as increasing the technical complexity of the system, and achieve the effect of reducing technical complexity

Inactive Publication Date: 2012-04-11
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, two different communication technologies, visible light communication and infrared communication, are used in the uplink and downlink, which increases the technical complexity of the system, and the CSMA / CD protocol in the uplink cannot avoid the problem of hidden stations in wireless communication.

Method used

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  • Visible light local area network duplex communication method
  • Visible light local area network duplex communication method
  • Visible light local area network duplex communication method

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Embodiment Construction

[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] Such as Figure 1-2 As shown, the visible light local area network duplex communication method described in the present invention performs data uplink transmission when the access point is turned off;

[0024] Data downlink transmission is performed when the access light is on.

[0025] Preferably, when performing uplink data transmission in the method, the terminal first sends a request frame to the access point, and sends a data frame after obtaining a response frame from the access point.

[0026] Preferably, the method modulates and broadcasts the data to be sent on lights of the access point when performing downlink data transmission.

[0027] In the method ...

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Abstract

The invention discloses a visible light local area network duplex communication method and relates to the technical field of visible light communication. In the method, up transmission of data is performed when an access point is turned off; a terminal sends a request frame to the access point at first and sends a data frame after receiving a response frame of the access point; and down transmission of the data is performed when the access point is turned on; and the data to be sent is modulated on light of the access point and broadcast. By the visible light local area network duplex communication method, an uplink and a downlink of a visible light local area network can work in a visible light wave band and two different technologies in the uplink and the downlink can be avoided, so the technical complexity of the local area network is reduced. In the uplink, a carrier sense multiple access / collision avoidance (CSMA / CA) protocol is adopted, so multiple access of the point is realized; and a requesting-authorizing mechanism can be used for distributing an up bandwidth, so hidden stations during wireless communication can be avoided.

Description

technical field [0001] The invention relates to the technical field of visible light communication, in particular to a duplex communication method for a visible light local area network. Background technique [0002] Visible light communication (Visible Light Communications, VLC) technology uses white light LED as light source, photoelectric conversion device or optical imaging device as photodetector, using the atmosphere as a channel, and modulates the transmission signal on the visible light emitted by LED for communication. communication technology. This technology emerges as the times require with the rapid development of LED lighting (that is, solid-state lighting) technology. [0003] Because compared with traditional light sources such as incandescent lamps and fluorescent lamps, LEDs have a much wider modulation bandwidth and can be switched at a higher frequency, which makes it possible to use LEDs as light sources for high-speed communication. Due to the very hi...

Claims

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Application Information

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IPC IPC(8): H04L5/14H04L12/413H05B37/02H04B10/10H04B10/11
Inventor 张明伦
Owner BEIJING UNIV OF POSTS & TELECOMM
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