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Multilayer modulation visible light communication method, transmitter, receiver and system

A visible light communication and transmitter technology, which is applied in the field of visible light communication, can solve the problems of incompatibility of multiple rate transmission modes, inability of transceivers to adapt to rate transmission modes, and failure to support multiple rate transmission mode switching, etc.

Active Publication Date: 2015-02-25
THE PLA INFORMATION ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a multi-layer modulation visible light communication method, transmitter, receiver and system to solve the problem that switching between multiple rate transmission modes is not supported in the prior art, and once the rate transmission mode changes , the transceiver cannot adapt to the new rate transmission mode, and there is a problem of incompatibility of multiple rate transmission modes

Method used

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  • Multilayer modulation visible light communication method, transmitter, receiver and system
  • Multilayer modulation visible light communication method, transmitter, receiver and system
  • Multilayer modulation visible light communication method, transmitter, receiver and system

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Embodiment 1

[0038] See figure 1 , which shows a flow chart of a multi-layer modulation visible light communication method provided by the present invention, the method is applied to a transmitting end, and the transmitting end supports a low-rate transmission mode and a high-rate transmission mode, and the low-rate The transmission mode adopts the first-layer modulation method, and the high-speed transmission mode adopts the second-layer modulation method, and the methods include:

[0039]In step 101, the transmission signal sent by the transmission end is firstly modulated by the first-layer modulation method, so as to realize the dynamic random selection of the time position of the transmission signal.

[0040] Among them, the transmitted signal modulated by the first layer modulation method is x 1 (i) represents the first layer of symbols transmitted by the transmitting end at time i.

[0041] Preferably, the modulation method of the first layer in the present invention may be an O...

Embodiment 2

[0057] Such as Image 6 As shown, the present invention also provides another flow chart of a multi-layer modulation visible light communication method, which is specifically applied to the receiving end, including:

[0058] Step 201, receiving a transmission signal from a transmitting end.

[0059] Step 202: Recover the modulation information modulated by the first-layer modulation method in the transmitted signal, and extract the symbol information of the first-layer modulation method from the modulation information. Wherein, the symbol information includes a start time and an end time.

[0060] Step 203, according to the symbol information, provide synchronization information for the demodulation of the second layer modulation mode.

[0061] Specifically, the process of demodulating the signal at the receiving end is as follows: Figure 7 shown.

Embodiment 3

[0063] Based on the multi-layer modulation visible light communication method provided by the previous invention, the invention also provides a transmitter and a receiver, respectively as Figure 8 with 9 shown. in,

[0064] The transmitter supports a low-rate transmission mode and a high-rate transmission mode, the low-rate transmission mode adopts a first-layer modulation method, and the high-rate transmission mode adopts a second-layer modulation method, and the transmitter specifically includes: a first-layer modulation unit 100 , the second layer modulation unit 200 and the data information transmission unit 300 . in,

[0065] The first-layer modulation unit 100 is configured to firstly modulate the transmission signal sent by the transmission end through the first-layer modulation method, so as to realize dynamic random selection of the time position of the transmission signal. Among them, the transmitted signal modulated by the first layer modulation method is x ...

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Abstract

The invention discloses a multilayer modulation visible light communication method, transmitter, receiver and system. The method includes firstly, modulating signals transmitted by a transmitting terminal by a first layer modulation manner to implement dynamic random selection of time positions of the transmitted signals; allowing the transmitted signals after the modulation by the first layer modulation manner to be (img file = 'DDA0000621938820000011.TIF' wi = '736' he = '104' / ), and allowing X1 (i) to present a first layer transmitting symbolic of the transmitting terminal at the moment i; when X1 (i) = 1, determining the transmitting terminal to be in a high-speed transmitting mode, and modulating the signals transmitted by the transmitting terminal by a second layer modulation manner; allowing the transmitted signals after the modulation by the second layer modulation manner to be (img file = 'DDA0000621938820000012.TIF' wi = '1144' he = '104' / ) ( / Maths), and finally controlling X2 (i) to transmit data information in the time position of the first layer modulation manner. Thus, seamless switching among various speed transmitting modes can be supported, and the compatibility of different speed transmitting modes is realized.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, and more specifically, relates to a multi-layer modulation visible light communication method, transmitter, receiver and system. Background technique [0002] Visible light communication is a new, short-distance, high-speed wireless optical communication technology developed on the basis of LED (Light-Emitting Diode, light-emitting diode) technology. The basic principle of visible light communication is to use the characteristics of fast switching speed of LED to communicate through high-frequency flickering of LED light source, which sends out high-speed optical signals, and then restores information through photoelectric conversion. [0003] However, in practical application scenarios, based on LED-based visible light communication, fixed LED lighting terminals do not support switching between multiple rate transmission modes. Once the rate transmission mode changes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116
Inventor 张效义张艳语邬江兴朱义君李青刘洛琨于宏毅仵国锋汪涛张俊
Owner THE PLA INFORMATION ENG UNIV