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Visible light communication MIMO (Multiple Input Multiple Output) system giving consideration to positioning

A technology of visible light communication and preset position, applied in the field of visible light communication, can solve problems such as difficult to decompose, lack of frequency and phase information, LED sub-channel interference, etc., to achieve the effect of increasing the proportion of payload

Active Publication Date: 2016-11-09
TSINGHUA UNIV +2
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Problems solved by technology

However, since visible light communication uses intensity modulation and direct detection, and lacks frequency and phase information, the interference between different LED sub-channels is serious and there is a strong correlation. It is difficult to decompose the information of each sub-channel, resulting in the inability to obtain spatial complex Use gain

Method used

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  • Visible light communication MIMO (Multiple Input Multiple Output) system giving consideration to positioning
  • Visible light communication MIMO (Multiple Input Multiple Output) system giving consideration to positioning
  • Visible light communication MIMO (Multiple Input Multiple Output) system giving consideration to positioning

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Embodiment Construction

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0021] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element refe...

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Abstract

The invention discloses a visible light communication MIMO (Multiple Input Multiple Output) system giving consideration to positioning. The visible light communication MIMO system comprises a transmitting terminal and a receiver, wherein the transmitting terminal comprises N LEDs (Light-Emitting Diodes); each LED is used for sending a plurality of independent data packets; a data frame at a first preset position of each data packet is a functional frame; each LED sends an optical signal with position information of the LED under equal power in a gap at a position corresponding to a number of the LED; at a position of a second data frame, N LEDs can simultaneously send a channel response training sequence according to a modulation mode and carry out combined channel response estimation; the receiver can obtain an MIMO channel matrix according to distribution of strength of the optical signals sent by the N LEDs and is used for demultiplexing N paths of signals; and meanwhile, the receiver can decode out the LED position information carried in the optical signals so as to implement visible light positioning. The visible light communication MIMO system has the following advantages that the data frames combine positioning of ID (Identity) information and acquisition of the channel matrix; and when visible light positioning is implemented, an effective load proportion in the data frames is improved.

Description

technical field [0001] The invention relates to the technical field of visible light communication, in particular to a visible light communication MIMO system taking into account positioning. Background technique [0002] Visible light communication technology is a wireless communication technology that uses the visible light band as an optical carrier for communication, and can realize high-speed data transmission. Compared with traditional wireless communication technology, visible light communication technology has the characteristics of high efficiency, no electromagnetic interference, green and environmental protection, and has attracted more and more attention at home and abroad. Visible light communication technology is to transmit information through the driving circuit, high-speed modulation to the LED optical signal, and the receiving end uses a photoelectric converter such as a photodiode (PD) to convert the optical signal into an electrical signal, and demodulate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/114H04B10/116
CPCH04B10/1143H04B10/116
Inventor 魏凌张洪明宋健
Owner TSINGHUA UNIV
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