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Precoded mimo‑oofdm‑vlc imaging communication method based on dynamic optical receiver selection PDs

A technology of MIMO-OOFDM-VLC and optical receiver, which is applied in the field of imaging VLC communication, can solve problems such as MU-MIMO-VLC system performance degradation, and achieve improved link bit error rate performance, high-performance gain, and stable performance buff effect

Active Publication Date: 2018-01-26
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 close, and the LED and The channel gain between PDs with close distances is usually similar, which will introduce serious channel correlation, which will make the performance of MU-MIMO-VLC system degrade sharply, which is also a difficulty faced by current indoor VLC applications

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  • Precoded mimo‑oofdm‑vlc imaging communication method based on dynamic optical receiver selection PDs
  • Precoded mimo‑oofdm‑vlc imaging communication method based on dynamic optical receiver selection PDs
  • Precoded mimo‑oofdm‑vlc imaging communication method based on dynamic optical receiver selection PDs

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Embodiment 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 as figure 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 present invention is ...

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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 (Visible Light Communication, VLC), and proposes an indoor multi-user precoded (Multi-user Precoded, MUP) multiple-input multiple-output (Multiple -input Multiple-output, MIMO) optical orthogonal frequency division multiplexing (Optical Frequency Division Multiplexing, 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 lights has also received a lot of attention from researchers. VLC technology is mainly based on Intensity Modulation (IM) and Direct Detection (DD) technology, which uses the rapidly changing light intensity that can be ignored by human eyes to transmit information. MIMO technology, which is widely used in traditional wireless communication, has also been applied in VLC technology by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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