CN103701526B - Multidimensional coding method in visible light communication - Google Patents
Multidimensional coding method in visible light communication Download PDFInfo
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- CN103701526B CN103701526B CN201310662164.6A CN201310662164A CN103701526B CN 103701526 B CN103701526 B CN 103701526B CN 201310662164 A CN201310662164 A CN 201310662164A CN 103701526 B CN103701526 B CN 103701526B
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Abstract
Multidimensional coding method in visible light communication, comprises multiple LED, loads 41 Goethe's codes and modulates, make it to produce corresponding light signal to each LED, forms the synchronous subframe of visible light communication multidimensional coding; By string of code flow point group, unique for the code word in each grouping is mapped to a PPM code signal; Wherein, the number of grouping is determined by the number of LED primary colours; PPM code signal is passed through LED drive load on single-primary-color LED, make it to produce corresponding single-primary-color LED light signal according to PPM code signal.The present invention utilizes redness, green and three primary colors or other the multi-primary LED light such as blue, adopt pulse position modulating method, the visible light signal of multidimensional coding can be produced, adopt the light signal of the different colours of pulse position modulation time the different patterns that formed the in the air basic patterns of multidimensional coding that form, improve a kind of channel utilization of spectrum, realize simple.
Description
Technical field
The invention belongs to communication means technical field, relate to a kind of multidimensional coding method in visible light communication.
Background technology
Visible light communication utilizes light-emitting diode (LED) exactly, while providing illumination, produces a kind of communication mode that human eye imperceptible high speed light and shade flash signal carrys out transmission of information, belongs to wireless light communication category in essence.Therefore, except there is the advantage of general wireless light communication, also have without the need to frequency spectrum certification, to people's safety, the advantages such as green energy conservation.
Current visible light communication research, mostly adopts OOK or VPPM modulation system, directly carries out intensity modulated carry out Signal transmissions in conjunction with RZ code or NRZ code to white light LEDs.Such way is easy to realize, but frequency spectrum resource utilization rate is too low.Whole visible light frequency band from 380nm to 780nm, the channel capacity that can provide up to 400TB, and if only modulated intensity, serious waste of resources.See this point just, IEEE802.15.7 group is in the suggestion of visible light communication, and also proposed the mode of CSK modulation, it utilizes the speed-sensitive switch characteristic of LED, make it the light signal sending different colours, thus encode to realize communication to the light signal of different colours.These coding methods simplify implementation often, but to sacrifice frequency resource for cost; Or can frequency spectrum resource be efficiently utilized, but add implementation complexity; This is worthless for the novel energy-conserving communication mode mainly utilizing visible LED to realize not only having thrown light on but also having communicated.
Summary of the invention
The object of the present invention is to provide a kind of multidimensional coding method in visible light communication, the method not only realizes simply, and resource utilization is high.
Technical scheme of the present invention is, the multidimensional coding method in visible light communication, comprises the LED of multiple primary colours, loads 41 Goethe's codes and modulates, make it to produce corresponding light signal to each LED, forms the synchronous subframe of visible light communication multidimensional coding; By string of code flow point group, unique for the code word in each grouping is mapped to a PPM code signal; Wherein, the number of grouping is determined by the number of LED primary colours; PPM code signal is passed through LED drive load on single-primary-color LED, make it to produce corresponding single-primary-color LED light signal according to PPM code signal.
Feature of the present invention is also:
PPM code signal is passed through LED drive load on multiple primary-color LED, make it to produce corresponding single-primary-color LED light signal according to PPM code signal, the final pattern forming visible ray multidimensional coding in space, constitutes the multidimensional coding of a complete visible light communication.
Said process circulates, and forms the data burst that effectively adopts visible ray multidimensional coding.
A synchronous subframe and multiple data burst form the Frame of visible ray multidimensional coding.
The present invention has following beneficial effect:
1, the present invention utilizes redness, green and three primary colors or other the multi-primary LED light such as blue, adopt pulse position modulating method, the visible light signal of multidimensional coding can be produced, overcome information redundancy in traditional visible light communication process, the inefficient problem of resource profit.
2, the present invention adopt the light signal of the different colours of pulse position modulation time the different patterns that formed the in the air basic patterns of multidimensional coding that form, improve a kind of channel utilization of spectrum, coding realizes simple, transmission and detection overhead little, more effectively can reduce the redundancy of information transmission, improve the level of resources utilization.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of the visible ray multidimensional coding of multidimensional coding method in visible light communication of the present invention.
Fig. 2 is the synchronous subframe schematic diagram of visible ray multidimensional coding of the multidimensional coding method in visible light communication of the present invention.
Fig. 3 is the two-dimensional encoded schematic diagram of visible ray of the multidimensional coding method in visible light communication of the present invention.
Fig. 4 is the visible ray multidimensional coding data burst schematic diagram of the multidimensional coding method in visible light communication of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
Multidimensional coding method in visible light communication of the present invention, specifically comprises the following steps:
1. couple each LED loads 41 Goethe's codes and modulates, and makes it to produce corresponding light signal, forms the frame head of each frame signal.
2., by string of code flow point group, unique for the code word in each grouping is mapped to a PPM coding.Wherein, the number of grouping is determined by the number of LED primary colours;
3. above-mentioned PPM code signal is passed through LED drive load on single-primary-color LED, make it to produce corresponding single-primary-color LED light signal according to the PPM signal of telecommunication;
4. many primary-color LEDs complete process described in 2 at synchronization, finally form the visible ray pattern of multidimensional coding in space.This just constitutes the multidimensional coding of a complete visible light communication.
5. repeat step 2 to 4, make it the data burst that formation one effectively adopts visible ray multidimensional coding.
6. repeat step 1 to 5, make it the Frame that formation one adopts visible ray multidimensional coding.
Embodiment, the multidimensional coding method in visible light communication, selects red-green-blue LED as light source.First produce 41 Goethe's coded signals by encoder, and it be loaded in the driving of three-primary color LED simultaneously, three primary colors LED light source is subject to modulation signal affects generation 41 Goethe's code optical signals, thus forms the synchronous subframe of visible light communication multidimensional coding.
The binary data code stream " 001001010100 " of input is divided into three groups by encoder, produce " 0010 " accordingly, the 16PPM modulation signal of " 0101 " and " 0100 ", 3 16PPM modulation signals are loaded into respectively on corresponding single-primary-color LED, drive it to send corresponding 16PPM visible light signal.These signals constitute a secondary multidimensional beam pattern in space, thus the multidimensional coding pattern that formation one is unique.So just achieve a complete visible ray multidimensional coding.
According to the continuous renewal of data code flow, encoder constantly produces the 16PPM modulation signal of grouping, thus the corresponding visible ray multidimensional coding light signal pattern producing LED.The pattern of several multidimensional codings just constitutes the data burst of one group of visible ray multidimensional coding.1 synchronous subframe and several data burst composition data frames.
The frame structure of the visible ray multidimensional coding that coding method of the present invention is formed, as shown in Figure 1, every frame comprises 1 synchronous subframe and several data bursts.
In traditional visible light communication, mostly adopt and do not design synchronous subframe.Such realization is relatively simple, but when light signal is when the code word of not height conversion for a long time, when such as sending continuous print " 0 " code or " 1 " code, clock signal is easy to lose, thus causes the follow-up error rate to increase suddenly.Had synchronous subframe, can be regular carry out synchronously to visible light signal, calibration clock signal, thus improve the reliability of visible light communication.
As shown in Figure 2, for the present invention is using RGB three-primary color LED as light source, adopt the synchronous subframe of 41 Goethe's code compositions.Each coloured light produces 41 Goethe's codes simultaneously, and unlabeled data frame is about to start to send.Receiving terminal, when recognizing the information of 41 Goethe's codes, according to reception condition, is calibrated the information of each color, thus carries out the preparation receiving data.
As shown in Figure 3, at a time, red LED adopts PPM modulation to send the code word of (0010), synchronization green LED also adopts PPM to send the code word of (0101), two-beam forms combination pattern in space, and detector receives red and green light signal respectively, according to the coding rule of primary colours PPM, search code table, solve corresponding code word.
As shown in Figure 4, equally for RGB three-primary color LED, adopt PPM modulation to produce corresponding light beam respectively to the LED of red, green, blue three kinds of colors simultaneously, thus form the PPM signal pattern of mixed-color light in space.During decoding, the light signal received is sent to PIN photoelectric detector by receiving terminal after filter, transfers the signal of telecommunication to, by maximum likelihood criterion determination signal form.Expanding to the situation of multiple bases light, the code word of the multidimensional coding of the image construction that the PPM position of often kind of color is spatially combined into.It should be noted that the frequency due to each color is different, so often kind of color time required when producing PPM pulse pattern is variant, needing for adjusting respectively.
Claims (1)
1. the multidimensional coding method in visible light communication, is characterized in that: the LED comprising multiple primary colours, loads 41 Goethe's codes and modulates, make it to produce corresponding light signal to each LED, forms the synchronous subframe of visible light communication multidimensional coding; By string of code flow point group, unique for the code word in each grouping is mapped to a PPM code signal; Wherein, the number of grouping is determined by the number of LED primary colours; PPM code signal is passed through LED drive load on single-primary-color LED, make it to produce corresponding single-primary-color LED light signal according to PPM code signal; PPM code signal is passed through LED drive load on multiple primary-color LED, make it to produce corresponding single-primary-color LED light signal according to PPM code signal, the final visible ray pattern forming multidimensional coding in space, constitutes the multidimensional coding of a complete visible light communication;
The multidimensional coding of several complete visible light communications forms the data burst that effectively adopts visible ray multidimensional coding;
A synchronous subframe and multiple data burst form the Frame of visible ray multidimensional coding.
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| CN104363382B (en) * | 2014-04-24 | 2015-10-14 | 北京国承万通信息科技有限公司 | A kind of method and apparatus utilizing visible light signal transmission/obtaining information |
| CN104038283A (en) * | 2014-06-05 | 2014-09-10 | 桂林电子科技大学 | LED lighting communication system |
| US10977466B2 (en) | 2015-07-09 | 2021-04-13 | Hewlett-Packard Development Company, L.P. | Multi-dimensional cyclic symbols |
| US10709967B2 (en) | 2015-10-27 | 2020-07-14 | Guangdong Virtual Reality Technology Co., Ltd. | Apparatus, methods, and systems for tracking an optical object |
| CN105721064B (en) * | 2016-01-18 | 2018-05-04 | 桂林电子科技大学 | The coding and decoding method and device of channel combined multidimensional pulse position modulation |
| CN107979414B (en) * | 2017-10-19 | 2019-08-27 | 南京邮电大学 | A kind of collaboration coded modulation formula wireless light communication control method |
| CN108134630B (en) * | 2017-12-27 | 2020-08-04 | 南京邮电大学 | Multi-user MAC channel access method based on hopping pattern |
| CN109889267B (en) * | 2018-09-28 | 2020-09-29 | 曹一宁 | Method for sending coded information based on optical communication, optical label and code scanning equipment |
| CN114978310B (en) * | 2021-02-22 | 2024-02-20 | 广州视源电子科技股份有限公司 | Method, device, processor and electronic equipment for communication by using spectrum |
| CN113037380B (en) * | 2021-03-23 | 2023-03-17 | 深圳市南科信息科技有限公司 | Visible light imaging communication method and system based on multi-channel PAM |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110103188A (en) * | 2010-03-12 | 2011-09-20 | 국민대학교산학협력단 | Transmission device for visible light communication and power control method of visible light in transmission device |
| CN103098553A (en) * | 2010-09-14 | 2013-05-08 | 皇家飞利浦电子股份有限公司 | Coded light emitting device |
| CN103414514A (en) * | 2013-08-07 | 2013-11-27 | 武汉邮电科学研究院 | System and method for visible light communication based on OFDM modulation codes and frequency division receiving |
-
2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110103188A (en) * | 2010-03-12 | 2011-09-20 | 국민대학교산학협력단 | Transmission device for visible light communication and power control method of visible light in transmission device |
| CN103098553A (en) * | 2010-09-14 | 2013-05-08 | 皇家飞利浦电子股份有限公司 | Coded light emitting device |
| CN103414514A (en) * | 2013-08-07 | 2013-11-27 | 武汉邮电科学研究院 | System and method for visible light communication based on OFDM modulation codes and frequency division receiving |
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