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Precoded MIMO-OOFDM visible light communication method

A technology of MIMO-OOFDM and visible light communication, which is applied in the field of visible light communication to improve system performance and reliability

Inactive Publication Date: 2016-04-20
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few researches on MU-MIMO technology in indoor VLC environment, but due to the transmission characteristics of VLC channel and the characteristics of VLC related modulation technology, there are certain differences between it and traditional wireless MU-MIMO technology

Method used

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  • Precoded MIMO-OOFDM visible light communication method
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  • Precoded MIMO-OOFDM visible light communication method

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Embodiment Construction

[0068] The drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0069] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0070] The invention is a multi-user precoded MIMO-OOFDM visible light communication system based on SM and SPPM. The block diagram of the system is as figure 1 shown.

[0071] 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 users in the room, and each user is equipped with N r,j optical receivers, the total number...

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Abstract

The invention discloses a precoded multiple-input-multiple-output-optical-frequency-division-multiplexing (MIMO-OOFDM) visible light communication method. The method comprises: channel matrixes of all users in an indoor environment are obtained; according to the indoor environment channel matrixes, a precoded matrix of each user is calculated by using a BD method; a bit data flow of each user is modulated by an spatial modulation (SM) or spatial pulse position modulation (SPPM) device to obtain a data vector of the user; according to a precoded matrix Pj, data of a user j after precoding are obtained; the data after precoding are modulated by using OOFDM to generate a to-be-transmitted optical signal of each LED lamp; OOFDM demodulation recovery is carried out on a received optical signal at a receiving end of each user; signals after the OOFDM demodulation are recovered; and then demodulation is carried out to obtain a bit data flow of each user.

Description

technical field [0001] The present invention relates to the field of visible light communication (VisibleLightCommunication, VLC), more specifically, to an indoor multi-user precoding (Multi-userPrecoded, MUP) based on spatial modulation (SpatialModulation, SM) and spatial pulse position modulation (SpatialPulsePositionModulation, SPPM) A VLC communication method of Multiple-input Multiple-output (Multiple-input Multiple-output, MIMO) Optical Orthogonal Frequency Division Multiplexing (Optical Frequency Division Multiplexing, OOFDM). Background technique [0002] With the development of the times and the wide application of light-emitting diodes (Light-emitting Diode, LED) in daily life, the VLC technology based on LED lights has gradually been favored by researchers from various countries and has launched research on it. The implementation of VLC is mainly based on Intensity Modulation (IM) and Direct Detection (DD) technologies, which use the rapidly changing light intensi...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B7/04
CPCH04B7/0413H04B10/116
Inventor 蔡鲲翼江明
Owner SYSU CMU SHUNDE INT JOINT RES INST
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