Modulation method supporting brightness modulation of indoor visible light communication system

A technology for visible light communication and brightness adjustment, applied in the field of visible light communication, to achieve the effects of low energy utilization, excellent BER performance, and high transmission rate

Active Publication Date: 2015-07-01
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the modulation scheme in the standard brings a certain degree of redundancy

Method used

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  • Modulation method supporting brightness modulation of indoor visible light communication system
  • Modulation method supporting brightness modulation of indoor visible light communication system
  • Modulation method supporting brightness modulation of indoor visible light communication system

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 Shown is a modulation method that supports brightness adjustment in an indoor visible light communication system. By making full use of the redundant symbols in the modulation scheme in the standard, it provides better bit error rate performance, and realizes reliable communication while meeting indoor lighting requirements. ; The method specifically includes: arranging LED lights and receiving equipment at a fixed position indoors, and aligning the LED lights with the photodetector of the receiving equipment, setting the peak transmit power of the LED lights as a fixed value, and adopting hybrid MPPM modulation and blind detection technology and MPPM demodulator to achieve better bit error rate performance; the mixed MPPM modulation is specifically: for a certain illumination brightness level, in a frame of data, part of the data adopts n-MPPM ...

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Abstract

The invention discloses a modulation method supporting brightness modulation of an indoor visible light communication system; aiming at the requirement that the visible light communication gives consideration to illumination in actual system, and reliable communication is realized under multiple brightness level conditions and the mixed MPPM modulation method is adopted; different modulation combining schemes are set according to different brightness modulation demands, a receiving terminal judges the ratio of the modulation combination according to the energy detection, and different illumination brightness levels are supported while the reliable transmission for information is ensured. Compared with technical scheme of adopting OOK modulation with redundancy compensation symbol in the standard IEEE802.15.7, and the technical scheme can have obvious performance gain under the indoor optical communication point-to-point communication scene.

Description

technical field [0001] The invention relates to a modulation method supporting brightness adjustment in an indoor visible light communication system, which belongs to the visible light communication technology. Background technique [0002] Visible light communication technology has gradually become a research hotspot in the field of communication in recent years. Visible light communication technology refers to a communication method that uses light in the visible light band as an information carrier and directly transmits optical signals in the air without using optical fiber and other wired channel transmission media. LED visible light communication is based on the fact that visible light-emitting diodes switch faster than fluorescent lamps and incandescent lamps. It uses high-speed modulated light waves that are invisible to the naked eye from indoor and outdoor large-scale display screens equipped with LEDs, lighting equipment, signal devices, and automobile front and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/50H04B10/556
Inventor 姜明刘晶赵春明梁霄黄鹤
Owner SOUTHEAST UNIV
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