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Visible-light double-layer superposition transmission system and method thereof

A transmission system and transmission method technology, applied in the field of visible light imaging communication, can solve the problems of low effectiveness and difficulty in meeting the uniformity of lighting lamps, and achieve the effect of satisfying uniform lighting and overcoming the influence of channel correlation

Active Publication Date: 2017-10-24
河南途东信息科技有限公司
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  • Application Information

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Problems solved by technology

Among them, RC technology is a low-efficiency but high-reliability transmission technology, and RC technology can better take into account the lighting requirements; SM technology can achieve a higher transmission rate, but because it only uses a limited number of LED lamp beads, so it is difficult to meet the uniformity requirements of lighting lamps

Method used

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  • Visible-light double-layer superposition transmission system and method thereof
  • Visible-light double-layer superposition transmission system and method thereof
  • Visible-light double-layer superposition transmission system and method thereof

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Embodiment approach

[0051] As an implementation, in step 3:

[0052] Each bit of transmission data is linearly superimposed using the joint transmission mechanism of two time slots, and the superimposed signals of the kth time slot and the k+1th time slot are respectively calculated using the following formula:

[0053] S[k]=A[k]+B[k]; S[k+1]=A[k+1]+B[k+1];

[0054] The driving signals of the kth time slot and the k+1th time slot after adding the DC bias are respectively calculated by the following formula:

[0055] S'[k]=S[k]+c; S'[k+1]=S[k+1]+c;

[0056] Among them, A[k] is the upper layer transmission signal modulated by the kth transmission slot, A[k]∈R M×N ; B[k] is the transmission signal of the lower layer modulated by the kth transmission slot, B[k]∈R M×N ; In the k+1th transmission time slot, the transmission signal of the upper layer is the inverted signal of the k time slot, that is, A[k+1]=-A[k], and the transmission signal of the lower layer is the same signal as the k time slot, ...

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Abstract

An embodiment of the invention discloses a visible-light double-layer superposition transmission system and a method thereof. The system comprises a sending end and a receiving end. The sending end comprises a coding module and an LED array. The receiving end comprises a decoding module and a camera. The coding module divides information to be sent into two layers so as to carry out transmission mapping. Mapped data is modulated via OOK so as to acquire a transmission signal. Linear superposition is performed on the transmission signal so as to acquire a superposed signal. A direct current bias is added to the superposed signal and then the signal is used to drive the LED array. The decoding module processes an LED array image shot by the camera so as to acquire a non-negativity signal. The non-negativity signal is used to carry out direct current removing operation so as to acquire a bipolar signal, and detection and decoding are performed so as to acquire information to be sent through reduction. In the embodiment of the invention, two kinds of information with different attributes is divided into two layers so as to carry out transmission, a problem that uniform illumination is difficult to satisfy when a high transmission rate is realized is solved, and then technical effects of satisfying the uniform illumination and overcoming a channel correlation influence are reached.

Description

technical field [0001] The invention relates to the field of visible light imaging communication, in particular to a visible light double-layer superposition transmission system and method. Background technique [0002] Visible light communication, with its advantages of high-speed broadband, wide coverage, and no electromagnetic interference, has attracted extensive attention from many researchers at home and abroad once it came out. As people's research continues and deepens, it is found that the narrow modulation bandwidth and nonlinearity of LED (Light Emitting Diode, Light Emitting Diode) are the main factors restricting the rapid development of visible light communication. As we all know, the MIMO (Multiple Input Multiple Output) system can double the performance of the system without increasing the system bandwidth and transmission power. The characteristics of multiple lamps in indoor lighting and the advantages of multiple LED lamp beads in lamps, It naturally crea...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/50
CPCH04B10/116H04B10/502
Inventor 吴江
Owner 河南途东信息科技有限公司
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