CN205883245U - Visible light communication system based on LED - Google Patents
Visible light communication system based on LED Download PDFInfo
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- CN205883245U CN205883245U CN201620789297.9U CN201620789297U CN205883245U CN 205883245 U CN205883245 U CN 205883245U CN 201620789297 U CN201620789297 U CN 201620789297U CN 205883245 U CN205883245 U CN 205883245U
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Abstract
The utility model discloses a visible light communication system based on LED, it comprises emitter, optical antenna and receiving arrangement. Optical antenna includes optical transmitting set antenna and optics receiving antenna. Is emitter including transmission host system, N NDPAPM code modulation module, a N LED constant current driver module and a N LED light source. Do does does receiving arrangement include photoelectric detection module, stride and hinder enlarged module, analog -to -digital conversion module, N NDPAPM decode demodulation module with receive host system. The utility model discloses a N the nDPAPM modulation technique combines together pulse amplitude modulation (MPAM) and both of these of n dimension pulse position modulation (nDPPM), has both reduced the requirement of system to the bandwidth, has improved information transmission rate, has strengthened system reliability again. For singly importing single -output (SISO) system, this system can increase channel capacity.
Description
Technical field
This utility model relates to communication technical field, is specifically related to a kind of LED-based visible light communication system.
Background technology
Compared with traditional luminaire, white light LEDs has low in energy consumption, length in service life, size driving little, easy, green
The advantages such as environmental protection, are considered the energy saving and environment friendly illuminating product of forth generation.Owing to the general work power of illumination LED is both greater than 10W,
Thus provide good guarantee condition for visible light communication.Visible light communication (VLC) is with LED as light source, with visible ray for letter
Breath carrier, air is channel, and Photoelectric Detection module (PD) is receiver, it is achieved that LED illumination double communication dual-use function.VLC's
Safety is high, and good confidentiality is especially suitable for applying in radio frequency (RF) sensitizing range, is the effective benefit to existing RF communication system
Fill.
Use which kind of modulator approach to be loaded on visible ray by breath of delivering letters to be passed, and which kind of demodulation method is delivered letters to be passed
Breath is separated from visible ray, and the performance for visible light communication produces vital impact.Typical intensity modulated/straight
Connect detection (IM-DD) technology relatively simple, easily realize, but noise robustness is poor.Pulse amplitude modulation (PAM) can effectively utilize band
Width, but add system docking and receive the requirement of machine.Conventional pulse position modulation (PPM) technology has higher power utilization, but
Add the system requirement to bandwidth.
Utility model content
Reliability and the effectiveness being existing modulation-demo-demodulation method and cannot ensureing visible ray to be solved in the utility model
Problem, it is provided that a kind of LED-based visible light communication system.
For solving the problems referred to above, this utility model is achieved through the following technical solutions:
A kind of LED-based visible light communication system, is made up of discharger, optical antenna and reception device.Above-mentioned light
Learn antenna and include optical transmitting antenna and optical receiver antenna.Above-mentioned discharger includes launching main control module, N-nDPAPM compiles
Code modulation module, N number of LED constant current drive module and N number of LED light source；The outfan launching main control module connects N-nDPAPM volume
The input of code modulation module, N number of outfan of N-nDPAPM code modulation module respectively drives the defeated of module with a LED constant current
Entering end to connect, N number of LED constant current drives the outfan of module to connect the input of N number of LED light source, the outfan of LED light source respectively
Connect the input of optical transmitting antenna.Above-mentioned reception device includes Photoelectric Detection module, across resistance amplification module, analog digital conversion mould
Block, N-nDPAPM decoding demodulation module and reception main control module；The outfan of optical receiver antenna connects Photoelectric Detection module, light
The outfan of electro-detection module connects the input across resistance amplification module, across the outfan connection mode number conversion mould of resistance amplification module
The input of block, the outfan of analog-to-digital conversion module connects the input of N-nDPAPM decoding demodulation module, and N-nDPAPM decodes
The outfan of demodulation module connects the input receiving main control module.Above-mentioned N and n is the positive integer more than 1.
In such scheme, N-nDPAPM code modulation module includes channel coding module, N number of n dimension PPM mapping block, N number of
N dimension PPM modulation module, N number of MPAM mapping block and N number of MPAM modulation module.The input of channel coding module constitutes N-
The input of nDPAPM code modulation module；The outfan of channel coding module is divided into N road, each road to be sequentially connected with 1 n dimension
PPM mapping block, 1 n dimension PPM modulation module, 1 MPAM mapping block and 1 MPAM modulation module；N number of MPAM modulates mould
The outfan of block constitutes N number of outfan of N-nDPAPM code modulation module；Above-mentioned M is the positive integer more than 1.
In such scheme, N-nDPAPM decoding demodulation module includes that MPAM demodulation module, n dimension PPM demodulation module, n tie up PPM
De-mapping module, logarithm maximal possibility estimation module and channel decoding module.The input of MPAM demodulation module constitutes N-
The input of nDPAPM decoding demodulation module；The outfan of MPAM demodulation module connects the input of n dimension PPM demodulation module, and n ties up
N outfan of PPM demodulation module connects n input of n dimension PPM De-mapping module, the output of n dimension PPM De-mapping module
End connects the input of logarithm maximal possibility estimation module, the outfan connecting channel decoding mould of logarithm maximal possibility estimation module
The input of block；The outfan of channel decoding module constitutes the outfan of N-nDPAPM decoding demodulation module；Above-mentioned M is more than 1
Positive integer.
In such scheme, LED light source is white light LEDs.
In such scheme, optical transmitting antenna is expanded beam optics lens, optical receiver antenna be filter set and optically focused saturating
Mirror.
Compared with prior art, this utility model uses N-nDPAPM modulation technique, by pulse amplitude modulation (MPAM) and n
Both dimensions pulse position modulation (nDPPM) combine, and have both reduced the system requirement to bandwidth, improve information transmission speed
Rate, enhances again system reliability.For single-input single-output (SISO) system, this system can increase channel capacity.
Accompanying drawing explanation
Fig. 1 is a kind of LED-based visible light communication system block diagram.
Detailed description of the invention
In order to be better understood from this utility model, below in conjunction with example and accompanying drawing, this utility model is further retouched
State.
A kind of LED-based visible light communication system, as it is shown in figure 1, by discharger, optical antenna and reception device group
Become.
Above-mentioned optical antenna includes optical transmitting antenna and optical receiver antenna.Optical transmitting antenna is expanded beam optics lens
(expanding telescope), can effectively reduce the angle of divergence launching light beam.Optical receiver antenna is filter set and optically focused
Lens, can strengthen the light intensity being irradiated to Photoelectric Detection Modular surface.
Above-mentioned discharger includes launching main control module, N-nDPAPM code modulation module, N number of LED constant current driving module
With N number of LED light source.The outfan launching main control module connects the input of N-nDPAPM code modulation module, and N-nDPAPM compiles
N number of outfan of code modulation module respectively drives the input of module to be connected with a LED constant current, and N number of LED constant current drives module
Outfan connects the input of N number of LED light source respectively, and the outfan of LED light source connects the input of optical transmitting antenna.LED
Light source is white light LEDs.Extranet information is processed as binary element and is input to N-nDPAPM coded modulation mould by transmitting main control module
Block；The n dimension PPM modulation of the complete paired data of N-nDPAPM code modulation module and MPAM modulation；It is right that LED constant current drives module to complete
The constant-current driving of LED light source；LED light source sends out visible ray via optical transmitting antenna.
N-nDPAPM code modulation module includes that channel coding module, N number of n dimension PPM mapping block, N number of n tie up PPM modulation
Module, N number of MPAM mapping block and N number of MPAM modulation module.The input of channel coding module constitutes N-nDPAPM coding and adjusts
The input of molding block.The outfan of channel coding module be divided into N road, each road be sequentially connected with 1 n dimension PPM mapping block, 1
Individual n dimension PPM modulation module, 1 MPAM mapping block and an outfan of 1 MPAM modulation module, i.e. channel coding module
Connecting the input of 1 n dimension PPM mapping block, n outfan of this n dimension PPM mapping block connects 1 n and ties up PPM modulation mould
N input of block, the outfan of this n dimension PPM modulation module connects the input of 1 MPAM mapping block, and this MPAM maps
The outfan of module connects the input of 1 MPAM modulation module, and the outfan of this MPAM modulation module connects 1 MPAM modulation
The input of module.The outfan of N number of MPAM modulation module constitutes N number of outfan of N-nDPAPM code modulation module.At this
In utility model preferred embodiment, channel coding module, n dimension PPM mapping block, n dimension PPM modulation module and MPAM mapping block
FPGA realizes.MPAM is modulated to hardware circuit and realizes, and many bits MPAM map information inputs parallel, controls LED constant current and drives
LED two ends M different bias voltage value in galvanic electricity road, and then the visible light signal of the different light intensity of output M.
Above-mentioned reception device include Photoelectric Detection (PD) module, across resistance amplify (TIA) module, analog digital conversion (ADC) module,
N-nDPAPM decoding demodulation module and reception main control module.The outfan of optical receiver antenna connects Photoelectric Detection module, photoelectricity
The outfan of detection module connects the input across resistance amplification module, and the outfan across resistance amplification module connects analog-to-digital conversion module
Input, the outfan of analog-to-digital conversion module connects the input of N-nDPAPM decoding demodulation module, and N-nDPAPM decodes solution
The outfan of mode transfer block connects the input receiving main control module.Photoelectric Detection module is positioned at collecting lens focal point, completes N road
The reception of parallel light signal and opto-electronic conversion；TIA module completes the amplification of the ultra-weak electronic signal to the output of Photoelectric Detection module；Mould
Number conversion module completes the analog digital conversion to N-nDPAPM modulated signal；N-nDPAPM decoding demodulation module completes MPAM and firmly demodulates
The soft demodulation of PPM signal is tieed up with n；Receive main control module and information is shown in host computer interface, it is simple to user checks.
N-nDPAPM decoding demodulation module include MPAM demodulation module, n dimension PPM demodulation module, n dimension PPM De-mapping module,
Logarithm maximal possibility estimation module and channel decoding module.The input of MPAM demodulation module constitutes N-nDPAPM decoding and solves mode transfer
The input of block.The outfan of MPAM demodulation module connects the input of n dimension PPM demodulation module, n of n dimension PPM demodulation module
Outfan connects n input of n dimension PPM De-mapping module, and the outfan of n dimension PPM De-mapping module connects logarithm maximum seemingly
The so input of estimation module, input of the outfan connecting channel decoder module of logarithm maximal possibility estimation module.Channel
The outfan of decoder module constitutes the outfan of N-nDPAPM decoding demodulation module.In this utility model preferred embodiment, n ties up
PPM demodulation module, n dimension PPM De-mapping module, logarithm maximal possibility estimation module and channel decoding module realize in FPGA.
Described MPAM is demodulated into hardware circuit and realizes, and adjudicates demodulation MPAM signal by ADC and multilevel comparator.
Above-mentioned N, n and M are the positive integer more than 1.N is determined by chnnel coding, and frame data are divided into N road parallel transmission,
The data that the transmission of every road is different, it is exactly source code that receiving terminal combines, and can improve transfer rate.N is dimension i.e. timeslot number.M is
The level number of PAM modulation.Work as N=2, during n=M=4, for 2-4DPPM-4PAM (2-4DPAPM) coded modulation.
Claims (5)
1. a LED-based visible light communication system, is made up of discharger, optical antenna and reception device；Its feature exists
In:
Above-mentioned optical antenna includes optical transmitting antenna and optical receiver antenna；
Above-mentioned discharger includes launching main control module, N-nDPAPM code modulation module, N number of LED constant current drive module and N number of
LED light source；The outfan launching main control module connects the input of N-nDPAPM code modulation module, N-nDPAPM coded modulation
N number of outfan of module respectively drives the input of module to be connected with a LED constant current, and N number of LED constant current drives the outfan of module
Connecting the input of N number of LED light source respectively, the outfan of LED light source connects the input of optical transmitting antenna；
Above-mentioned reception device includes Photoelectric Detection module, solves mode transfer across resistance amplification module, analog-to-digital conversion module, N-nDPAPM decoding
Block and reception main control module；The outfan of optical receiver antenna connects Photoelectric Detection module, and the outfan of Photoelectric Detection module is even
Connecing the input across resistance amplification module, the outfan across resistance amplification module connects the input of analog-to-digital conversion module, analog digital conversion
The outfan of module connects the input of N-nDPAPM decoding demodulation module, and the outfan of N-nDPAPM decoding demodulation module connects
Receive the input of main control module；
Above-mentioned N and n is the positive integer more than 1.
The LED-based visible light communication system of one the most according to claim 1, it is characterised in that: N-nDPAPM encodes
Modulation module includes that channel coding module, N number of n dimension PPM mapping block, N number of n tie up PPM modulation module, N number of MPAM mapping block
With N number of MPAM modulation module；
The input of channel coding module constitutes the input of N-nDPAPM code modulation module；The outfan of channel coding module
It is divided into N road, each road to be sequentially connected with 1 n dimension PPM mapping block, 1 n and ties up PPM modulation module, 1 MPAM mapping block and 1
Individual MPAM modulation module；The outfan of N number of MPAM modulation module constitutes N number of outfan of N-nDPAPM code modulation module；
Above-mentioned M is the positive integer more than 1.
The LED-based visible light communication system of one the most according to claim 1, it is characterised in that: N-nDPAPM decodes
Demodulation module includes that MPAM demodulation module, n dimension PPM demodulation module, n tie up PPM De-mapping module, logarithm maximal possibility estimation module
And channel decoding module；
The input of MPAM demodulation module constitutes the input of N-nDPAPM decoding demodulation module；The outfan of MPAM demodulation module
Connecting the input of n dimension PPM demodulation module, n outfan of n dimension PPM demodulation module connects n of n dimension PPM De-mapping module
Input, the outfan of n dimension PPM De-mapping module connects the input of logarithm maximal possibility estimation module, logarithm maximum likelihood
The input of the outfan connecting channel decoder module of estimation module；The outfan of channel decoding module constitutes N-nDPAPM decoding
The outfan of demodulation module；
Above-mentioned M is the positive integer more than 1.
The LED-based visible light communication system of one the most according to claim 1, it is characterised in that: LED light source is white light
LED。
The LED-based visible light communication system of one the most according to claim 1, it is characterised in that: optical transmitting antenna
For expanded beam optics lens, optical receiver antenna is filter set and collecting lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620789297.9U CN205883245U (en) | 2016-07-26 | 2016-07-26 | Visible light communication system based on LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620789297.9U CN205883245U (en) | 2016-07-26 | 2016-07-26 | Visible light communication system based on LED |
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| Publication Number | Publication Date |
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| CN205883245U true CN205883245U (en) | 2017-01-11 |
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ID=57697208
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620789297.9U Expired - Fee Related CN205883245U (en) | 2016-07-26 | 2016-07-26 | Visible light communication system based on LED |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130637A (en) * | 2016-07-26 | 2016-11-16 | 桂林电子科技大学 | A kind of LED-based visible light communication system and method |
| CN107342812A (en) * | 2017-07-06 | 2017-11-10 | 吉林大学 | Human eye can not perceive VLC device and methods |
-
2016
- 2016-07-26 CN CN201620789297.9U patent/CN205883245U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130637A (en) * | 2016-07-26 | 2016-11-16 | 桂林电子科技大学 | A kind of LED-based visible light communication system and method |
| CN106130637B (en) * | 2016-07-26 | 2018-06-01 | 桂林电子科技大学 | A kind of LED based visible light communication system and method |
| CN107342812A (en) * | 2017-07-06 | 2017-11-10 | 吉林大学 | Human eye can not perceive VLC device and methods |
| CN107342812B (en) * | 2017-07-06 | 2019-09-13 | 吉林大学 | Human eye can not perceive VLC device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20180726 |
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| CF01 | Termination of patent right due to non-payment of annual fee |