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Light emitting diode adjusting method and device in visible light communication

A light-emitting diode and visible light communication technology, applied in the field of optics, can solve the problems of high cost, difficulty in reducing the size of MIMO system, unfavorable promotion and application of VLC-MIMO system, etc.

Active Publication Date: 2016-06-08
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

However, the added optical devices will lead to high cost, and the additional optical devices will make it difficult to reduce the size of the MIMO system to the expected size, which is not conducive to the promotion and application of the VLC-MIMO system

Method used

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  • Light emitting diode adjusting method and device in visible light communication
  • Light emitting diode adjusting method and device in visible light communication
  • Light emitting diode adjusting method and device in visible light communication

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Embodiment Construction

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] In the VLC-MIMO system, when the size of the LED array and the PD array is reduced, a large channel correlation will be generated for the PD array, which will cause great signal interference and affect the optical transmission signal of the PD array to the LED array. read.

[0034] In order to solve the problem of large channel correlation, the traditional way i...

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Abstract

The embodiment of the invention discloses a light emitting diode adjusting method and device in visible light communication. The method and the device are applied in an MIMO (Multiple-Input Multiple-Output) system. The MIMO system comprises an LED array and a PD (Photo-Diode) array; the quantity of the LED units in the LED array is the same to that of the PD units in the PD array; the inclination angles of the LED units in the LED array are adjusted; in the adjusting process, the MxN direct current gain matrix between the LED array and the PD array is calculated in real time; if the numerical value of the ith row and the jth column in the numerical values of a target element in the direct current gain matrix is the maximum, and the jamming to signal ratio of the target element in the jth column is less than a preset value, it is determined that the adjusting of the inclination angle of the jth LED unit in the LED array is finished. After the adjusting of the inclination angles is finished, the channel correlation generated by the LED array to the PD array is reduced compared with that before the adjusting; and the communication rate is promoted.

Description

technical field [0001] The invention relates to the field of optics, in particular to a method and device for adjusting a light emitting diode in visible light communication. Background technique [0002] In the field of visible light communication (English: VisibleLightCommunication, abbreviation: VLC), light-emitting diodes (English: LightEmittingDiode, abbreviation: LED) are mainly used as the transmitting end, and photodiodes (English: Photo-Diode, abbreviation: PD) are used as the receiving end to realize Optical communication transmission. In order to increase the transmission rate, a parallel transmission mode is often used, for example, a parallel LED array and a PD array used in a Multiple-Input Multiple-Output (English: Multiple-Input Multiple-Output, abbreviation: MIMO) system. Through the parallel operation of multiple LED lights in the array, it is expected to increase the optical communication transmission rate to Tb / (s mm 2 ). [0003] The number of LEDs in...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/50H04B7/04
CPCH04B7/0413H04B10/116H04B10/502
Inventor 朱义君张海勇
Owner THE PLA INFORMATION ENG UNIV
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