Precoding MIMO-OOFDM-VLC (Multiple-input Multiple-output-Optical Frequency Division Multiplexing-Visible Light Communication) imaging communication method based on PDS (Photodetector Selection)

A technology of MIMO-OOFDM-VLC and communication method, which is applied in the field of imaging VLC communication, and can solve problems such as performance degradation of MU-MIMO-VLC system

Active Publication Date: 2016-06-08
SYSU CMU SHUNDE INT JOINT RES INST +1
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Problems solved by technology

There is an important problem in the application of the current indoor MU-MIMO-VLC system, that is, in order to meet the miniaturization requirements of the user terminal, the distance between different PDs of the same user terminal in the MU-MIMO system is usually very cl

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  • Precoding MIMO-OOFDM-VLC (Multiple-input Multiple-output-Optical Frequency Division Multiplexing-Visible Light Communication) imaging communication method based on PDS (Photodetector Selection)
  • Precoding MIMO-OOFDM-VLC (Multiple-input Multiple-output-Optical Frequency Division Multiplexing-Visible Light Communication) imaging communication method based on PDS (Photodetector Selection)
  • Precoding MIMO-OOFDM-VLC (Multiple-input Multiple-output-Optical Frequency Division Multiplexing-Visible Light Communication) imaging communication method based on PDS (Photodetector Selection)

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[0036] Example 1

[0037] The focus of the present invention is to introduce the imaging optical receiver and PDS technology into the indoor MU-MIMO-VLC system, effectively reducing the channel correlation between the same user or different user receiver PDs, thereby maximizing the improvement of multi-user MIMO-VLC system performance. The system block diagram of the present invention is asfigure 1 shown.

[0038] Without loss of generality, it is assumed that there is a uniform distribution of N on the ceiling of the indoor room t LED lights, there are K user terminals in the room, and the jth user terminal is equipped with M r,j PD, then the total number of PDs in the multi-user system is In each symbol transmission period, the j-th user’s M r,j Only N in PD r,j PDs are activated, then the total number of activated PDs in the multi-user system is figure 2 A schematic diagram of a typical scenario described above is given. A specific implementation manner of the pr...

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Abstract

The invention discloses a precoding MIMO-OOFDM-VLC (Multiple-input Multiple-output-Optical Frequency Division Multiplexing-Visible Light Communication) imaging communication method based on PDS (Photodetector Selection). In the method, imaging reception and a receiving antenna selection technology are combined, and the VLC channel relevance among PDs (Photodetectors) of a same user terminal or different user terminals can be lowered remarkably, so that a stable high-performance gain is obtained for a multi-user system in a typical indoor environment; a more robust transmission link is formed for a plurality of users in the typical indoor environment; and the link bit error rate performance of a communication system is improved effectively.

Description

technical field [0001] The present invention faces the field of visible light communication (VisibleLightCommunication, VLC), and proposes an indoor multi-user precoded (Multi-user Precoded, MUP) multiple-input multiple-output (Multiple-inputMultiple-output) based on dynamic optical receiver selection (Photodetector Selection, PDS) , MIMO) optical orthogonal frequency division multiplexing (OpticalFrequencyDivisionMultiplexing, OOFDM) imaging VLC communication method. Background technique [0002] With the development of technology, lighting systems using light-emitting diodes (Light-emitting Diode, LED) have been widely used, and the VLC technology based on LED lamps has also received a lot of attention from researchers. VLC technology is mainly based on intensity modulation (Intensity Modulation, IM) and direct detection (Direct Detection, DD) technology, which uses the light intensity of rapid changes that can be ignored by human eyes to transmit information. MIMO techno...

Claims

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Application Information

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IPC IPC(8): H04B10/114H04B10/116H04B10/67H04L27/26H04B7/04
CPCH04B7/0452H04B10/114H04B10/116H04B10/671H04B10/672H04L27/2697
Inventor 蔡鲲翼江明
Owner SYSU CMU SHUNDE INT JOINT RES INST
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