CN103684531A - Power line communication and visible light communication combined system and method for optimizing cell architectures - Google Patents
Power line communication and visible light communication combined system and method for optimizing cell architectures Download PDFInfo
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Abstract
The invention relates to a power line communication and visible light communication combined system and a method for optimizing cell architectures. The power line communication and visible light communication combined system comprises a data source, broadband access and routing equipment, first power modems and visible light communication subsystems which are sequentially connected with one another. Each visible light communication subsystem comprises a plurality of visible light access points and terminals, each visible light access point comprises a second power modem module, a routing module, a downlink code modulation and light transmission module, an uplink detection, demodulation and decoding module and an LED lamp, and each visible light communication subsystem is correspondingly provided with the single corresponding first power modem. Compared with the prior art, the power line communication and visible light communication combined system and the method have the advantages of high expandability, actual service value, adaptability and transmission performance, wide application range and the like, are applicable to transmission with high reliability and high data transmission rate and have a broad market-oriented prospect.
Description
Technical field
The present invention relates to visible light communication technical field, especially relate to the communication system with signal of telecommunication regeneration link that a kind of power line communication is combined with visible light communication and the method for the access of the optimization visible ray based on this communication system community framework.
Background technology
How convenient in order to solve, at low cost that transfer of data is upper to " utilizing visible ray to carry out the Novel LED light of data transmit-receive ", power line communication is combined with visible light communication and becomes the research direction in a forward position.But, in existing solution, one class methods are to utilize coupler to extract the signal of telecommunication transmitting in power circuit to send into LED, then by LED driver element, voltage signal is converted to current signal, then LED is carried out to intensity modulation (such as the application number Chinese patent that is 201210252064.1).This method adopts common technology to realize the combination of power line network and LED visible light communication, and both signal unifications, without signal regeneration.But in the method owing to having omitted signal regeneration link, make the modulation system when LED lamp carries out data transmission can only be limited to intensity modulation, and can not utilize senior digital signal encoding and modulation technique, such as OFDM (OFDM) technology, channel coding technology based on convolution code etc., go to realize the transmitting of high reliability and high data rate.And for the another kind of method of considering signal regeneration link, route when route when existing research just concentrates on (such as the application number Chinese patent that is 201220097159.6) in the design of the inside structure of " utilizing visible ray to carry out the Novel LED light of data transmit-receive " or do not consider that a plurality of terminals access certain Novel LED light and a plurality of adjacent subsystems (such as a plurality of offices or the room of a floor) access data source.In a word, when adopting these class methods, also lack the design comprehensively and reasonably of the whole system framework from data source (such as internet) to visible ray transceiver terminal.
Meanwhile, when the visible light communication system in conjunction with power line communication designs, in the existing system design scheme of considering ul transmissions, be all almost that hypothesis terminal equipment possesses visible data emissivities in up link.But, in fact, for existing universal personal communications terminal (such as notebook computer, mobile phone, Pad etc.), than visible light communication down link processing capacity module integration is entered to these terminals, allow in these terminals the integrated difficulty of entering " can launch the lamp of the light of some strength " obviously much bigger.In addition, even consider to go specially design to there is the novel visible transceiver terminal of " lamp that can launch the light of some strength ", the design of the position of lamp in terminal and terminal use may need specially the lamp in terminal to be gone the bad user who aims at the practical operation difficulty of access point and bring to experience when carrying out ul transmissions, are all the problems of urgently furtheing investigate and going solution.So when system, we need to go to consider to allow terminal utilize existing wireless communications technology to carry out the possibility of ul transmissions.
During another even more important problem, a lot of research is up to now all that visible light communication for point-to-point carries out correlation technique research.The visible light communication system of a plurality of for having disposed " utilizing visible ray to carry out the Novel LED light of data transmit-receive ", in the existing research few in number of carrying out system architecture design, a kind of relatively reasonable design is the system architecture with reference to commercial cellular mobile communication, regard each Novel LED light as the community (cell) that can be accessed by visible ray transceiver terminal, distribute a cell ID (cell ID) then to each Novel LED light.But in actual applied environment (in such as room, in traffic system), being all that a plurality of lamps are closely intensive is deployed in a given region.In such network environment, if visible ray transceiver terminal in motion, will face so frequently handover and then cause affecting transmission performance.Therefore, need to access community framework to visible ray and be optimized design to address this problem.
Summary of the invention
Object of the present invention is exactly that a kind of visible light communication system with signal of telecommunication regeneration link of combination power line communication and the method for the access of the optimization visible ray based on this communication system community framework are provided in order to overcome the defect of above-mentioned prior art existence.
Object of the present invention can be achieved through the following technical solutions: a kind of visible light communication system of combination power line communication, it is characterized in that, comprise the data source connecting successively, broadband access and routing device, the first electric power modem and visible light communication subsystem, described visible light communication subsystem comprises a plurality of visible ray access points and terminal, described visible ray access point comprises the second electric power modem module, routing module, downlink code modulation and light emission module, up link detects and demodulation decoding module and LED lamp, visible light communication subsystem described in each correspondingly configures the first electric power modem described in,
In down link, the data that described broadband access and routing device are sent into data source (such as internet) by digital signal transmission line road (such as netting twine) send to the first electric power modem, the first described electric power modem is converted to digital signal after the signal of telecommunication, by power line, send to each visible ray access point, the second described electric power modem module sends to routing module after signal of telecommunication demodulation is regenerated as to digital signal, described routing module carries out the digital signal of regeneration to send into downlink code modulation and light emission module after routing configuration for one or more accessing terminal, described downlink code modulation and light emission module modulate encoding digital signals by carrying out VISIBLE LIGHT EMISSION by Novel LED light,
In up link, for the visible ray access point described in any one, described up link demodulation coding module carries out the digital signal of being sent by one or more terminals receiving to send into routing module after demodulation coding, described routing module carries out the digital signal of reception to send into the second electric power modem module after routing configuration for one or more accessing terminal, the second described electric power modem module is that the signal of telecommunication is sent into the first electric power modem by digital signal modulated, the first described electric power modem sends to broadband access and routing device after converting electrical signals to digital signal, described broadband access and routing device by data feedback to data source.
Described downlink code modulation and light emission module comprise downlink coding modulator, descending digital to analog converter, the first downlink power amplifier and LED lamp drive circuit and chip, described downlink code modulation and light emission module add the control signal data (such as the distribution of access sub-band resource) of appropriate design by belonging to one or more digital signals that access terminal for different terminals, then send into described downlink coding modulator and carry out corresponding coded modulation (such as being modulated to again OFDM symbol after convolutional encoding), after processing by described descending digital to analog converter again, send into the first downlink power amplifier, finally by carrying out VISIBLE LIGHT EMISSION by LED lamp drive circuit and chip drives LED lamp.
Described up link detects and demodulation decoding module comprises upstream data detector, the first ascending power amplifier, up low pass filter, up analog to digital converter, uplink demodulation decoder, after the data that transmitted by one or more terminal wireless are first processed by described upstream data detector, after being processed successively by the first described ascending power amplifier and up low pass filter, send into described up analog to digital converter, again the digital signal of output is sent into described uplink demodulation decoder and carry out the corresponding mediation decoding of separating, finally the digital signal obtaining is sent into described routing module and done further ul transmissions processing.
Described upstream data detector comprises upstream data visible light detector and upstream data electromagnetic wave detector, or only includes one of them according to the up emissivities of terminal.For example, if visible ray transceiver terminal only possesses based on electromagnetic conventional wireless data transmission ability, the detection of the up link of visible ray access point and demodulation decoding module just can only possess upstream data electromagnetic wave detector.
Described upstream data visible light detector comprises up optical filter, up lens and the up photodetector connecting successively, and described up photodetector is photodiode.
Described upstream data electromagnetic wave detector comprises uplink receiving antenna and the uplink receiving processing radio-frequency devices connecting successively.
Described terminal comprises down link processing module and uplink processing module;
For the terminal described in any one, described down link processing module comprises descending optical filter, descending lens, descending photodetector (such as photodiode), the second downlink power amplifier, descending low pass filter, descending analog to digital converter and the descending demodulator decorder connecting successively, and described down link processing module receives by " making the data of carrier with visible ray " of corresponding visible ray access point transmitting and processes;
Described uplink processing module comprises up coding demodulator, up digital to analog converter, the second ascending power amplifier and upstream data reflector, described uplink processing module is added and to be sent into successively described up coding demodulator, up digital to analog converter and the second ascending power amplifier after control signal data and process initial data, launches afterwards via upstream data reflector.
Described upstream data reflector comprises upstream data visible light emitter and upstream data electromagnetic wave transmitter, or only includes one of them.
Described upstream data visible light emitter is can utilize sent visible ray to carry out the up LED lamp of transfer of data, and this LED lamp comprises drive circuit, chip and luminescent device.
Described upstream data electromagnetic wave transmitter comprises up transmitting processing radio-frequency devices and up transmitting antenna.
A method for the optimization community framework of the visible light communication system based in conjunction with power line communication, is characterized in that:
(1) for a given area that is deployed with a plurality of visible ray access points in visible light communication subsystem, the visible ray access point that the light that has high luminous intensity in this given area and send can be covered to whole given area is defined as macrocell node, and by being the visible ray coverage subset sent of this macrocell node with this macrocell node visible ray coverage adjacent deployment, that send, any visible ray access point is defined as by a band auxiliary community node of this macrocell node institute master control;
Each described macrocell node has independently cell ID, each described band auxiliary community node does not have independently cell ID, each described band auxiliary community node is " transparent " for terminal, that is to say, terminal not can be appreciated that the existence with auxiliary community node.
Described band auxiliary community node launch of data channels data in down link, not emission control signaling data (such as for allowing terminal carry out the control signal data of community discovery); In the visible ray coverage of sending with auxiliary community node in certain, any one terminal in the visible ray coverage of simultaneously also sending in macrocell node, receives the control signal data of being launched by macrocell node and by the data channel signal with the transmitting of auxiliary community node.
When motion state, when the visible ray coverage of only sending from a macrocell node is moved into the visible ray coverage that another macrocell node sends, just can there is handover in described terminal.
(2) in down link, the method of the optimization visible ray access community framework based on described, function and the interface relationship of the visible light communication system of described combination power line communication need to be made corresponding renewal, in downlink transmission processing procedure, described renewal is specific as follows
The digital signal that the first described electric power modem transmits described broadband access and routing device is converted to after the signal of telecommunication, sends to each the macrocell node in corresponding visible light communication subsystem; Described in each, the second electric power modem module of macrocell node is regenerated as digital signal by signal of telecommunication demodulation, then by determining in digital signal, by the digital signal of oneself carrying out downlink transmission, send into own routing module, the digital signal of carrying out downlink transmission with auxiliary community node that decision is distributed to institute's master control is converted to the signal of telecommunication and is transferred to corresponding band auxiliary community node by power line; Described each transmits the macrocell node via affiliated with the second electric power modem module of auxiliary community node signal of telecommunication demodulation by power line is regenerated as digital signal, then sends into the routing module of oneself.
(3) in up link, the method of the optimization visible ray access community framework based on described, function and the interface relationship of the visible light communication system of described combination power line communication need to be made corresponding renewal, in uplink data transmission processing procedure, described renewal is specific as follows
Described each is the signal of telecommunication with the second electric power modem module of auxiliary community node by the digital signal modulated of sending here via the routing module of oneself, the macrocell node under then sending into by power line;
For the second electric power modem module of described macrocell node, the renewal of its function and interface relationship comprises following three kinds of situations:
I) if there is no by the electrical uplink signals transmitting via power line with auxiliary community node, the second electric power modem module of described macrocell node is the signal of telecommunication by the digital signal modulated of sending here via the routing module of oneself, and sends into the first electric power modem by power line;
Ii) if existed by the electrical uplink signals transmitting via power line with auxiliary community node, and do not have the digital signal of being sent here by the routing module of described macrocell node oneself, the second electric power modem module of described macrocell node is directly sent into the first electric power modem by power line by handle by the electrical uplink signals transmitting with auxiliary community node;
Iii) if existed by the electrical uplink signals transmitting via power line with auxiliary community node, and there is the digital signal of being sent here by the routing module of described macrocell node oneself simultaneously, the second electric power modem module of described macrocell node is carried out demodulation and is regenerated as digital signal by the electrical uplink signals transmitting with auxiliary community node first, again two parts digital signal is merged and respective handling after be modulated to the signal of telecommunication, finally by power line, send into the first electric power modem;
The first described electric power modem is converted to digital signal by the signal of telecommunication that in corresponding visible light communication subsystem, each macrocell node transmits, and then by digital signal transmission line road, sends to described broadband access and routing device.
Compared with prior art, the present invention has the following advantages:
1, the present invention, by being regenerated as digital signal after signal of telecommunication modulation, can adjust coding modulation technique according to actual needs, is applicable to realize the transmitting of high reliability and high data rate.
Route processing when 2, the present invention design has been contained a plurality of visible light communication subsystems and a plurality of VISIBLE LIGHT EMISSION terminal and existed, extensibility is strong, and actual use value is high.
3, the present invention is directed to and only have the terminal of VISIBLE LIGHT EMISSION ability, only have the terminal of electromagnetic wave emissivities and have visible ray simultaneously and the terminal of electromagnetic wave emissivities, can realize the transmission process of up link, applicability is strong, wide application.
4, visible ray transceiver terminal of the present invention is when motion state, when the visible ray coverage of only sending from a macrocell node is moved into the visible ray coverage that another macrocell node sends, just can there is handover, effectively solved the problem of visible ray transceiver terminal access community generation frequent handovers in prior art, improve the transmission performance of whole communication system, there is wide market-oriented prospect.
Accompanying drawing explanation
Fig. 1 is the configuration diagram that communication system of the present invention is given.
In figure, M represents optical fiber or netting twine or telephone wire; W represents netting twine; E represents power line.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, a kind of visible light communication system of combination power line communication, it is characterized in that, comprise the data source 1 connecting successively, broadband access and routing device 2, the first electric power modem 3 and visible light communication subsystem 4, described visible light communication subsystem 4 comprises a plurality of visible ray access points and terminal 5, described visible ray access point comprises the second electric power modem module 41, routing module 42, downlink code modulation and light emission module 43, up link detects and demodulation decoding module 44 and LED lamp, visible light communication subsystem 4 described in each correspondingly configures the first electric power modem 3 described in,
Described downlink code modulation and light emission module 43 comprise downlink coding modulator, descending digital to analog converter, the first downlink power amplifier and LED lamp drive circuit and chip, the modulation of described downlink code and light emission module will belong to one or more 5 digital signal control signal data for different terminal interpolation appropriate design that access terminal, then send into described downlink coding modulator and carry out corresponding coded modulation, after processing by described descending digital to analog converter again, send into the first downlink power amplifier, finally by carrying out VISIBLE LIGHT EMISSION by LED lamp drive circuit and chip drives LED lamp.
Described up link detects and demodulation decoding module 44 comprises upstream data detector, the first ascending power amplifier, up low pass filter, up analog to digital converter, uplink demodulation decoder, after the data of being come by one or more terminal 5 wireless transmission are first processed by described upstream data detector, after being processed successively by the first described ascending power amplifier and up low pass filter, send into described up analog to digital converter, again the digital signal of output is sent into described uplink demodulation decoder and carry out the corresponding mediation decoding of separating, finally the digital signal obtaining is sent into described routing module and done further ul transmissions processing.
Described upstream data detector comprises upstream data visible light detector and upstream data electromagnetic wave detector, or only includes one of them according to the up emissivities of terminal 5.For example, if 5, terminal possesses based on electromagnetic conventional wireless data transmission ability, the detection of the up link of visible ray access point and demodulation decoding module just can only possess upstream data electromagnetic wave detector.Described upstream data visible light detector comprises up optical filter, up lens and the up photodetector connecting successively, and described up photodetector is photodiode.Described upstream data electromagnetic wave detector comprises uplink receiving antenna and the uplink receiving processing radio-frequency devices connecting successively.
Described terminal 5 comprises down link processing module and uplink processing module; For the terminal 5 described in any one, described down link processing module comprises descending optical filter, descending lens, descending photodetector (such as photodiode), the second downlink power amplifier, descending low pass filter, descending analog to digital converter and the descending demodulator decorder connecting successively, and described down link processing module receives by " making the data of carrier with visible ray " of corresponding visible ray access point transmitting and processes; Described uplink processing module comprises up coding demodulator, up digital to analog converter, the second ascending power amplifier and upstream data reflector, described uplink processing module is added and to be sent into successively described up coding demodulator, up digital to analog converter and the second ascending power amplifier after control signal data and process initial data, launches afterwards via upstream data reflector.
Described upstream data reflector comprises upstream data visible light emitter and upstream data electromagnetic wave transmitter, or only includes one of them.Described upstream data visible light emitter is can utilize sent visible ray to carry out the up LED lamp of transfer of data, and this LED lamp comprises drive circuit, chip and luminescent device.Described upstream data electromagnetic wave transmitter comprises up transmitting processing radio-frequency devices and up transmitting antenna.
A method for the optimization visible ray access community framework of the visible light communication system based in conjunction with power line communication, is characterized in that,
(1) for a given area that is deployed with a plurality of visible ray access points in visible light communication subsystem 4, the visible ray access point that the light that has high luminous intensity in this given area and send can be covered to whole given area is defined as macrocell node AP1, and by being the visible ray coverage subset sent of this macrocell node with this macrocell node visible ray coverage adjacent deployment, that send, any visible ray access point is defined as by a band auxiliary community node AP2 of this macrocell node institute master control;
Each described macrocell node AP1 has independently cell ID, and each described band auxiliary community node AP2 does not have independently cell ID.Each described band auxiliary community node AP2 is " transparent " for terminal 5, that is to say, terminal 5 not can be appreciated that the existence with auxiliary community node AP2.
Described band auxiliary community node AP2 launch of data channels data in down link, not emission control signaling data; In the visible ray coverage of sending with auxiliary community node AP2 in certain, also any one terminal 5 in the visible ray coverage of sending in macrocell node AP1, receives by the control signal data of macrocell node AP1 transmitting with by the data channel signal with auxiliary community node AP2 transmitting simultaneously.
When motion state, when the visible ray coverage of only sending from a macrocell node AP1 is moved into the visible ray coverage that another macrocell node AP1 sends, just can there is handover in described terminal 5.
(2) in down link, method based on adopting described optimization visible ray access community framework, the function of the certain module in the visible light communication system of combination power line communication of the present invention and interface relationship have corresponding renewal, and the existing transfer of data flow process that these are upgraded in conjunction with whole down link is described below:
Described data source 1 transfers data to broadband access and routing device 2 by optical fiber or netting twine or telephone wire M, the digital signal that described broadband access and routing device 2 send data source 1 by netting twine W is sent into the first electric power modem 4, the first described electric power modem 4 is converted to digital signal after the signal of telecommunication, send to each the macrocell node AP1 in corresponding visible light communication subsystem 3, described in each, the second electric power modem module of macrocell node AP1 is regenerated as digital signal by signal of telecommunication demodulation, then by the digital signal of oneself carrying out downlink transmission, sent determining in digital signal into the routing module of oneself, the digital signal of carrying out downlink transmission with auxiliary community node AP2 that determines to be distributed to institute's master control is converted to the signal of telecommunication, and be transferred to corresponding band auxiliary community node AP2 by power line E, described each is regenerated as the signal of telecommunication demodulation of reception after digital signal with the second electric power modem module of auxiliary community node AP2, send into the routing module of oneself, the routing module of described macrocell node AP1 and the described routing module with auxiliary community node AP2 5 carry out the digital signal of regeneration after routing configuration for one or more accessing terminal respectively, send into downlink code modulation and light emission module separately, described downlink code modulation and light emission module modulate encoding digital signals by carrying out VISIBLE LIGHT EMISSION by Novel LED light.
(3) in up link, method based on adopting described optimization visible ray access community framework, the function of the certain module in the visible light communication system of combination power line communication of the present invention and interface relationship have corresponding renewal, and the existing transfer of data flow process that these are upgraded in conjunction with whole up link is described below:
The up link of any one visible ray access community node detects and demodulation decoding module carries out the received digital signal being sent by one or more terminals 5 to send into routing module after demodulation coding;
Described each sent into this with the second electric power modem module of auxiliary community node AP2 with the routing module of auxiliary community node AP2 by having carried out the digital signal after routing configuration, and described the second electric power modem module is by power line E, to send into this with the macrocell node AP1 under the node AP2 of auxiliary community after the signal of telecommunication by digital signal modulated;
The routing module of described macrocell node AP1 will carry out the digital signal after routing configuration and sent into the second electric power modem module of this macrocell node AP1, and the subsequent treatment of described the second electric power modem module comprises following three kinds of situations:
31) if there is no by the electrical uplink signals transmitting via power line E with auxiliary community node AP2, the second electric power modem module of this macrocell node AP1 is the signal of telecommunication by the digital signal modulated of sending here via the routing module of oneself, and sends into corresponding the first electric power modem 4 by power line E;
32) if existed by the electrical uplink signals transmitting via power line E with auxiliary community node AP2, and do not have the digital signal of being sent here by the routing module of this macrocell node AP1 oneself, the second electric power modem module of this macrocell node AP1 is just directly sent into corresponding the first electric power modem 4 by power line E the electrical uplink signals by transmitting with auxiliary community node AP2;
33) if existed by the electrical uplink signals transmitting via power line E with auxiliary community node AP2, and there is the digital signal of being sent here by the routing module of this macrocell node AP1 oneself simultaneously, the second electric power modem module of this macrocell node AP1 is regenerated as digital signal by first by the electrical uplink signals demodulation transmitting with auxiliary community node AP2, again two parts digital signal is merged and respective handling after be modulated to the signal of telecommunication, finally by power line E, send into corresponding the first electric power modem 4;
The signal of telecommunication that the first described electric power modem 3 transmits each the macrocell node AP1 in corresponding visible light communication subsystem 4 is converted to digital signal, then by netting twine W, send to broadband access and routing device 2, described broadband access and routing device 2 by optical fiber or netting twine or telephone wire M by data feedback to data source 1.
Claims (11)
1. the visible light communication system in conjunction with power line communication, it is characterized in that, comprise the data source connecting successively, broadband access and routing device, the first electric power modem and visible light communication subsystem, described visible light communication subsystem comprises a plurality of visible ray access points and terminal, described visible ray access point comprises the second electric power modem module, routing module, downlink code modulation and light emission module, up link detects and demodulation decoding module and LED lamp, visible light communication subsystem described in each correspondingly configures the first electric power modem described in,
In down link, the data that described broadband access and routing device are sent into data source by digital signal transmission line road send to the first electric power modem, the first described electric power modem is converted to digital signal after the signal of telecommunication, by power line, send to each visible ray access point, the second described electric power modem module sends to routing module after signal of telecommunication demodulation is regenerated as to digital signal, described routing module carries out the digital signal of regeneration to send into downlink code modulation and light emission module after routing configuration for one or more accessing terminal, described downlink code modulation and light emission module modulate encoding digital signals by carrying out VISIBLE LIGHT EMISSION by Novel LED light,
In up link, described up link demodulation coding module carries out the digital signal of being sent by one or more terminals receiving to send into routing module after demodulation coding, described routing module carries out the digital signal of reception to send into the second electric power modem module after routing configuration for one or more accessing terminal, the second described electric power modem module is that the signal of telecommunication is sent into the first electric power modem by digital signal modulated, the first described electric power modem sends to broadband access and routing device after converting electrical signals to digital signal, described broadband access and routing device by data feedback to data source.
2. the visible light communication system of a kind of combination power line communication according to claim 1, it is characterized in that, described downlink code modulation and light emission module comprise downlink coding modulator, descending digital to analog converter, the first downlink power amplifier and LED lamp drive circuit and chip, described downlink code modulation and light emission module add the control signal data of appropriate design by belonging to one or more digital signals that access terminal for different terminals, then send into described downlink coding modulator and carry out corresponding coded modulation, after processing by described descending digital to analog converter again, send into the first downlink power amplifier, finally by carrying out VISIBLE LIGHT EMISSION by LED lamp drive circuit and chip drives LED lamp.
3. the visible light communication system of a kind of combination power line communication according to claim 1, it is characterized in that, described up link detects and demodulation decoding module comprises upstream data detector, the first ascending power amplifier, up low pass filter, up analog to digital converter, uplink demodulation decoder, after the data that transmitted by one or more terminal wireless are first processed by described upstream data detector, after being processed successively by the first described ascending power amplifier and up low pass filter, send into described up analog to digital converter, again the digital signal of output is sent into described uplink demodulation decoder and carry out the corresponding mediation decoding of separating, finally the digital signal obtaining is sent into described routing module and done further ul transmissions processing.
4. the visible light communication system of a kind of combination power line communication according to claim 3, it is characterized in that, described upstream data detector comprises upstream data visible light detector and upstream data electromagnetic wave detector, or only includes one of them according to the up emissivities of terminal.
5. the visible light communication system of a kind of combination power line communication according to claim 1, is characterized in that, described terminal comprises down link processing module and uplink processing module;
Described down link processing module comprises descending optical filter, descending lens, descending photodetector, the second downlink power amplifier, descending low pass filter, descending analog to digital converter and the descending demodulator decorder connecting successively, and described down link processing module receives by " making the data of carrier with visible ray " of corresponding visible ray access point transmitting and processes;
Described uplink processing module comprises up coding demodulator, up digital to analog converter, the second ascending power amplifier and upstream data reflector, described uplink processing module is added and to be sent into successively described up coding demodulator, up digital to analog converter and the second ascending power amplifier after control signal data and process initial data, launches afterwards via upstream data reflector.
6. the visible light communication system of a kind of combination power line communication according to claim 5, is characterized in that, described upstream data reflector comprises upstream data visible light emitter and upstream data electromagnetic wave transmitter, or only includes one of them.
7. a method for the optimization community framework of the visible light communication system based on combination power line communication as claimed in claim 1, is characterized in that:
For a given area that is deployed with a plurality of visible ray access points in visible light communication subsystem, the visible ray access point that the light that has high luminous intensity in this given area and send can be covered to whole given area is defined as macrocell node, and by being the visible ray coverage subset sent of this macrocell node with this macrocell node visible ray coverage adjacent deployment, that send, any visible ray access point is defined as by a band auxiliary community node of this macrocell node institute master control;
Each described macrocell node has independently cell ID, each described band auxiliary community node does not have independently cell ID, each described band auxiliary community node is " transparent " for terminal, that is to say, terminal not can be appreciated that the existence with auxiliary community node.
8. a kind of method of optimizing visible ray access community framework according to claim 7, is characterized in that described band auxiliary community node launch of data channels data in down link, not emission control signaling data; In the visible ray coverage of sending with auxiliary community node in certain, any one terminal in the visible ray coverage of simultaneously also sending in macrocell node, receives the control signal data of being launched by macrocell node and by the data channel signal with the transmitting of auxiliary community node.
9. a kind of method of optimizing visible ray access community framework according to claim 7, it is characterized in that, described terminal is when motion state, when the visible ray coverage of only sending from a macrocell node is moved into the visible ray coverage that another macrocell node sends, just can there is handover.
10. a kind of method of optimizing visible ray access community framework according to claim 7, it is characterized in that, function and the interface relationship of the visible light communication system of described combination power line communication are made corresponding renewal, in downlink transmission processing procedure, described renewal is specific as follows
The digital signal that the first described electric power modem transmits described broadband access and routing device is converted to after the signal of telecommunication, sends to each the macrocell node in corresponding visible light communication subsystem; Described in each, the second electric power modem module of macrocell node is regenerated as digital signal by signal of telecommunication demodulation, then by determining in digital signal, by the digital signal of oneself carrying out downlink transmission, send into own routing module, the digital signal of carrying out downlink transmission with auxiliary community node that decision is distributed to institute's master control is converted to the signal of telecommunication and is transferred to corresponding band auxiliary community node by power line; Described each transmits the macrocell node via affiliated with the second electric power modem module of auxiliary community node signal of telecommunication demodulation by power line is regenerated as digital signal, then sends into the routing module of oneself.
11. a kind of methods of optimizing visible ray access community framework according to claim 7, it is characterized in that, function and the interface relationship of the visible light communication system of described combination power line communication are made corresponding renewal, in uplink data transmission processing procedure, described renewal is specific as follows
Described each is the signal of telecommunication with the second electric power modem module of auxiliary community node by the digital signal modulated of sending here via the routing module of oneself, the macrocell node under then sending into by power line;
For the second electric power modem module of described macrocell node, the renewal of its function and interface relationship comprises following three kinds of situations:
I) if there is no by the electrical uplink signals transmitting via power line with auxiliary community node, the second electric power modem module of described macrocell node is the signal of telecommunication by the digital signal modulated of sending here via the routing module of oneself, and sends into the first electric power modem by power line;
Ii) if existed by the electrical uplink signals transmitting via power line with auxiliary community node, and do not have the digital signal of being sent here by the routing module of described macrocell node oneself, the second electric power modem module of described macrocell node is directly sent into the first electric power modem by power line by handle by the electrical uplink signals transmitting with auxiliary community node;
Iii) if existed by the electrical uplink signals transmitting via power line with auxiliary community node, and there is the digital signal of being sent here by the routing module of described macrocell node oneself simultaneously, the second electric power modem module of described macrocell node is carried out demodulation and is regenerated as digital signal by the electrical uplink signals transmitting with auxiliary community node first, again two parts digital signal is merged and respective handling after be modulated to the signal of telecommunication, finally by power line, send into the first electric power modem;
The first described electric power modem is converted to digital signal by the signal of telecommunication that in corresponding visible light communication subsystem, each macrocell node transmits, and then by digital signal transmission line road, sends to described broadband access and routing device.
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