CN104270174A - Communication method and system with power line and visible light integration - Google Patents
Communication method and system with power line and visible light integration Download PDFInfo
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Abstract
The invention discloses a communication method and system with power line and visible light integration. The method comprises the steps that a preset transmission service is modulated according to a preset transmission mode, and a modulated signal to be transmitted forms a first signal frame to be coupled to a power line to be transmitted; the first signal frame is extracted, an electrical signal service is obtained according to the signaling information in the first signal frame, the electrical signal service forms a second signal frame, a voltage signal in the second signal frame is converted into a current signal through an LED driving unit, the light intensity of each LED is adjusted, and the second signal frame is modulated to a visible light domain to be transmitted; an electrical signal in the visible light domain is obtained, a sub-channel corresponding to the electrical signal service is modulated according to the signaling information of the electrical signal, and a digital signal in the sub-channel is obtained. According to the method, the high-capacity data service can be transmitted, downlinks can share the same source and be uniform in coverage, uplinks are flexible and are selected as needed, and multi-service transmission and target positioning are achieved while the high-capacity data transmission is achieved.
Description
Technical field
The present invention relates to communication technical field, be specifically related to communication means and the system of a kind of power line and visible ray fusion.
Background technology
Along with the fast development of the communication technology, radio communication service demand and the frequency spectrum resource contradiction of expansion are at a high speed increasingly sharpened, and explore the hot issue that new frequency spectrum resource has become current wireless communication field.
The transmission mediums such as current employing cable, optical fiber achieve radio communication, but adopt the transmission medium such as cable and optical fiber to need the construction of line, likely original finishing can be destroyed in the process of the construction of line, and the construction of line needs the man power and material of at substantial, for radio communication brings great inconvenience.
Optical communication as a kind of take light wave as the Emerging wireless communications technology of information transmission carrier, having that transmission frequency bandwidth, message capacity are large, safety and environmental protection, without electromagnetic interference, without the need to taking the advantages such as existing frequency spectrum resource, to receive much concern in recent years.
LED itself needs electric current to drive, and can naturally link together with power line, therefore the combination that power line network communicates with LED light can be regarded as the natural network of an one integrated mass in logic.Power line is not only powered to LED, also as the signal source of LED light communication.The communication technology that power line communication is combined with optical communication, can make both advantages complement one another and carry out broadband high-speed Signal transmissions, set up robust efficient communication system.Conventional art often experienced by the process of repeatedly demodulation and modulation at the forwarding interface of power line communication and line-of-sight propagation, and the business model realized is often very single, therefore in what manner two kinds of communication modes are organically combined to realize the focus that the multiple services transfer of data of Large Copacity becomes people.
Summary of the invention
For defect of the prior art, the invention provides communication means and the system of a kind of power line and visible ray fusion, achieve the multiple services transfer of data of Large Copacity by power line and visible ray integration technology.
First aspect, the invention provides the communication means of a kind of power line and visible ray fusion, comprising:
Predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit;
Extract described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits;
Obtain the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to the signaling information demodulation of described light signal, and obtain the digital signal in described subchannel.
Optionally, described default transmission mode comprises: the working frequency range of communication system, maximum channel bandwidth, scrambler mode, coded system, constellation mapping mode, interleaving mode, modulation system and framing mode.
Optionally, described first signal frame that formed by signal to be transmitted after modulation is coupled in power circuit and transmits, and comprising:
Described signal to be transmitted is divided into multiple different subchannel according to time dimension.
Optionally, described first signal frame is time-multiplexed form, and described first signal frame is divided into multiple time slot according to the time, and described multiple different subchannel is time different the first signal frame, and described time slot comprises ascending time slot and descending time slot;
Described signal to be transmitted adopts OFDM modulation, and the mode of described composition first signal frame comprises ZP-OFDM, CP-OFDM, TDS-OFDM.
Optionally, described first signal frame of described extraction, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, comprising:
When in described first signal frame without signaling information or described first signal frame in have signaling information and do not comprise the instruction of signal of telecommunication forwarding service in described signaling information time, then whole direct described signal of telecommunication business of forwarding;
Otherwise, carry out all directly forwarding or signal of telecommunication business described in selective forwarding according to the described signal of telecommunication forwarding service instruction in described signaling information;
When described signal of telecommunication forwarding service is designated as selective forwarding, then according to described signal of telecommunication forwarding service instruction, filtering is carried out to the described signal of telecommunication business of non-forwarded.
Optionally, described first signal frame of described extraction, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, also comprise:
When not comprising the instruction of described signal of telecommunication forwarding service in described signaling information, then all signals of telecommunication that same power line connects are carried out all directly forwarding, all LED penetrate same visible light signal with taking place frequently simultaneously, form LED-based single frequency network communication pattern.
Optionally, the described subchannel that signal of telecommunication business is corresponding according to described signaling information demodulation, and obtain the digital signal in described subchannel, comprising:
Equilibrium treatment is carried out to the superposition of each LED light signal described in receiving.
Optionally, in time division multiplexing frame, insert the locating information of each LED, for realizing the location of visible ray.
Optionally, described method also comprises:
After obtaining the digital signal in described subchannel, signal receiving end can also send feedback information by ascending time slot to signal sending end;
Described signal receiving end sends feedback information by the form that Wifi, 3G/4G signal, visible ray are up to described signal sending end.
Second aspect, present invention also offers the communication system of a kind of power line and visible ray fusion, comprising:
Signal emission module, for predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit;
Signal forwarding module, for extracting described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits;
Signal receiving module, for obtaining the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to the signaling information demodulation of described light signal, and obtain the digital signal in described subchannel.
As shown from the above technical solution, the communication means that a kind of power line provided by the invention and visible ray merge and system, the transmission of jumbo data service is achieved by power line and visible ray integration technology, make descending homology, cover evenly, uply to select flexibly, as required, and realize multi-service transport and target localization while realizing jumbo transfer of data.
In specification of the present invention, describe a large amount of detail.But can understand, embodiments of the invention can be put into practice when not having these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme, it all should be encompassed in the middle of the scope of claim of the present invention and specification.
Accompanying drawing explanation
The schematic flow sheet of the power line that Fig. 1 provides for one embodiment of the invention and the communication means that visible ray merges;
The drive circuit schematic diagram regulating visible ray according to the signal of telecommunication that Fig. 2 provides for one embodiment of the invention;
The structural representation of the signal frame structure that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the power line that Fig. 4 provides for one embodiment of the invention and the communication system that visible ray merges.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
The present invention needs electric current to drive based on due to LED itself, can naturally link together with power line, therefore the combination that power line network communicates with LED light can be regarded as the natural network of an one integrated mass in logic, wherein power line network is short-range backbone network, and Large Copacity metropolitan area network/wide area network that one end and optical fiber etc. are formed is connected; The other end and LED natural are connected, and information are launched by LED with the lower line mode of wireless light communication, and can utilize power line or utilize the mode of wireless light communication to realize up information transmission equally.Power line is not only powered to LED, also as the signal source of LED light communication.The communication technology that power line communication is combined with optical communication, can make both advantages complement one another and carry out broadband high-speed Signal transmissions, set up robust efficient communication system.
With employing other transmission mediums such as cable, optical fiber as compared with LED interface, the optical communication system of power line access has many advantages: one, powerline systems covers all rooms substantially, be the network that current area coverage is the widest, access number is maximum, access service can be provided easily; Two, adopt the fund input that existing distribution line can be avoided needed for the extra construction of line, also do not need to destroy original finishing, engineering construction is simple; Three, both can carry out the Large Copacity transmission such as voice, image, video, be convenient to again home intranet, intelligent appliance had controlled, for Internet of Things provides physical basis.
In the communication system that power line communication is combined with optical communication, how to tackle the challenge of power line transmission environment and optical transport environment simultaneously, it is one of its key problem, namely how according to the characteristic of power line channel and optical channel, select suitable transmission mode, spectral efficient, high power system capacity, high-transmission reliability are provided, meet the service guarantees of business demand.Such as, optical channel and power line channel are all deeply by the impact of multipath effect.In optical communication system, multiple LED light source usually can be adopted to realize good illuminating effect, and indoor environment also has reflex to houselights, therefore the impact of multipath effect on indoor LED light communication system is very remarkable; The line construction of power circuit is complicated, and signal by mulitpath incoming terminal, also can exist signal reflex in load place, also makes power line there is serious multipath effect.Therefore, select the modulation system resisting multipath effect very crucial.Existing result of study shows, anti-multipath jamming, the availability of frequency spectrum are high, transmission rate advantages of higher to adopt OFDM multi-carrier modulation technology to have, and effectively can improve the performance of optical communication and power line communication.
Extensively there is the technical advantage that feature communicates with LED light in what utilize power line, based on power line communication optical communication system illumination with communicate on all there is the unrivaled advantage of conventional communication techniques, there is wide market-oriented prospect.
Fig. 1 shows the schematic flow sheet of power line that the embodiment of the present invention provides and the communication means that visible ray merges, and as shown in Figure 1, the method comprises the steps:
101, predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit;
Concrete, described signal to be transmitted is divided into multiple different subchannel according to time dimension, to facilitate signal forwarding module and signal receiving module choosing signal service, described first signal frame is the form of time division multiplexing (TDD), first signal frame body is divided into multiple time slot according to the time, described multiple different subchannel is time different the first signal frame, some time slot as up, effectively can suppress the self-interference of uplink and downlink signals in visible light communication as some time slot descending as up time slot.The mode of described signal to be transmitted adopts OFDM modulation, and the mode of described composition first signal frame comprises ZP-OFDM, CP-OFDM, TDS-OFDM.The locating information of each LED is inserted, for realizing the location of visible ray in time division multiplexing frame.
For example, described default transmission mode comprises: the working frequency range of communication system, maximum channel bandwidth, scrambler mode, coded system, constellation mapping mode, interleaving mode, modulation system and framing mode.
102, described first signal frame is extracted, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits;
Concrete, when in described first signal frame without signaling information or described first signal frame in have signaling information and do not comprise the instruction of signal of telecommunication forwarding service in described signaling information time, then whole described signal of telecommunication business of forwarding;
Otherwise, all forward or signal of telecommunication business described in selective forwarding according to the described signal of telecommunication forwarding service instruction in described signaling information;
When described signal of telecommunication forwarding service is designated as selective forwarding, then according to described signal of telecommunication forwarding service instruction, filtering is carried out to the described signal of telecommunication business of non-forwarded.
In another embodiment, when not comprising the instruction of described signal of telecommunication forwarding service in described signaling information, then all forwarded by all signals of telecommunication that same power line connects, all LED penetrate same signal of communication with taking place frequently simultaneously, form LED-based single frequency network communication pattern.
Said method obtains each LED light signal, described each LED light signal is superposed, and because each LED propagation delay time is different, is equivalent to multi-path channel signal, needs each LED light signal described in after signal receiving end is to superposition to carry out equilibrium treatment.
Concrete, signal of telecommunication business is extracted above by coupler, according to the signaling information in the first signal frame, some business of the signal of telecommunication is taken out, after automatic growth control process, by LED drive unit, voltage signal is converted to current signal, regulates the luminous intensity of each LED, signal frame bar is known that visible domain transmits.
103, obtain the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to the signaling information demodulation of described light signal, and obtain the digital signal in described subchannel.
Concrete, by the signaling information of optical communication, the subchannel that demodulation oneself needs business corresponding.
For example, because the propagation delay times such as each LED are different, are equivalent to multi-path channel signal, need to carry out corresponding equilibrium treatment at signal receiving end.
Said method also comprises not shown step 104
104, after obtaining the digital signal in described subchannel, signal receiving end also sends feedback information to signal sending end;
Described signal receiving end sends feedback information by the form that Wifi, 3G/4G signal, visible ray are up to described signal sending end.
Said method achieves the transmission of jumbo data service by power line and visible ray integration technology, make descending homology, cover evenly, uply to select flexibly, as required, and realize multi-service transport and target localization while realizing jumbo transfer of data.
Said method is illustrated below by specific embodiment.
Embodiment one
The present embodiment provides power line that the present invention proposes and the communication means that visible light communication merges towards the application in the downlink communication system of wideband digital terrestrial broadcasting.This system requirements provides the four descending SD digital TV broadcasting services in tunnel in 8MHz bandwidth, adopts single led emission source.Details are as follows for involved method flow and transmission mode:
Predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit.
Above-mentioned transport service needs to carry out the clear digital TV broadcasting service transmission of four road signs, then each first signal frame is divided into four time domain subchannels, ascending time slot and signaling informations.Wherein each subchannel is responsible for transmission business; The transmission that ascending time slot is uplink information and reception provide condition; Signaling information is responsible for the corresponding business of upward signal feedback instruction according to user.For the subservice of the item of digital television transmission in subchannel, the mode of its modulation is as follows:
System bandwidth is 8MHz, and channel width is also 8MHz, and electric line communication system working frequency range is 2-10MHz, LED flash speed is 10MHz.With reference to digital television terrestrial broadcasting system DTMB, AFE (analog front end) adopts time-domain filtering shaping, and formed filter is chosen as SRRC filter, and roll-off factor is 0.05, basic symbol speed is selected to be 7.56MHz, basic symbol is spaced apart (1/7.56) us ≈ 0.1323us.
Consider that the randomization treating transmission of digital signals is so that transmission information process, need treat transmission of digital signals and carry out scrambling, scrambler is a binary pseudo random sequence of maximum length, and generator polynomial is defined as
G(x)＝1+x
14+x
15
The initial phase of this sequence is defined as 100101010000000.
Coding is carried out to scrambler result and obtains code word.The coding method adopted is forward error correction coding, and formed by outer code and ISN cascade, outer code is BCH code, ISN to be equivalent encoder bit rate be 0.4 LDPC (7493,3048) code.Carry out constellation mapping to the code word obtained, the complex symbol that generated codeword is corresponding, the mode of constellation mapping is 64QAM.Time domain interweaves with adopting and encodes based on the convolutional interleave of constellation symbol, and time domain intertexture result and system information parameters form block of frequency domain data, and each frequency domain data block length is 3780, comprising 3744 data symbols and 36 system information parameters symbols.Block of frequency domain data obtains time-domain data blocks through 3780 IDFT conversion.
Adopt TDS-OFDM as framing technology; select by a known auxiliary sequencel and preamble thereof, the rear synchronous protection interval formed as the filling between time-domain data blocks; wherein; auxiliary sequencel is that known PN sequence obtains through IDFT conversion; length is 255 symbols, preamble and rear be synchronously the cyclic extensions of this PN sequence, preamble length is 82 symbols; rear synchronization length is 83 symbols, protection interval overall length 420 symbols.Time-domain data blocks and protection interval group are synthesized the first signal frame, in each first signal frame, adopts the PN sequence of out of phase as auxiliary sequencel according to the clock signal of present frame.
After this, baseband signal is carried out up-conversion, gets the reprocessing such as real part and digital-to-analogue conversion, transmitted.
All four tunnel business are carried out time domain framing after as above processing, and Fig. 3 is shown in by frame structure schematic diagram, transmitted, and is coupled in power circuit and transmits.
Extract described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits.
First according to the corresponding modulation system of the signaling information in the first signal frame, demodulation is carried out to described signaling information, obtain and forward instruction.
Because the present embodiment only has a LED emission source, therefore directly can adopt drive circuit as shown in Figure 2, voltage signal is converted to current signal, for driving multiple different LED luminous and regulating luminous intensity.The application is not described in detail to this drive circuit.
Obtain the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to the signaling information demodulation of described light signal, and obtain the digital signal in described subchannel.
By PIN photoelectric detector receiving optical signals, and sensed light signal intensity, be converted to the signal of telecommunication.The signal of telecommunication completes automatic growth control in AFE (analog front end), analog-to-digital conversion, filtering, down-conversion obtain baseband signal, obtains transmission of digital signals through synchronous and demodulating and decoding.And that road program of demodulation oneself needs can be carried out according to the instruction of signaling information.
Embodiment two
The present embodiment provides the power line of the present invention's proposition and the application of the communication means of visible light communication fusion in the duplex communication system of the Wideband Wireless Digital Communication towards optional business of choosing a job.In this duplex communication system, up link adopts WiFi to realize, and the realization that communicates that down link adopts power line to combine with visible light communication adopts multiple LED emission source, makes user optionally can receive the business of demand.Details are as follows for involved method flow and transmission mode:
Predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit.
According to the quantity of the business of transmission, the first signal frame is divided into multiple time domain subchannel.Suppose that this transmitter module needs to carry out the clear digital TV broadcasting service transmission of four road signs, then each signal frame is divided into four time domain subchannels, ascending time slot and signaling informations.Wherein each subchannel is responsible for transmission business; The transmission that ascending time slot is uplink information and reception provide condition; Signaling information is responsible for the corresponding business of upward signal feedback instruction according to user, completes the task of resolving each LED subordinate's user's request.For the subservice of the item of digital television transmission in subchannel, the mode of its modulation is as follows:
System bandwidth is 30MHz, and channel width is also 30MHz, and electric line communication system working frequency range is 0-30MHz, LED flash speed is 30MHz.AFE (analog front end) adopts that subcarrier in frequency domain is shaping realizes spectral shaping.Select basic symbol speed to be 30.00MHz, basic symbol interval (1/30.00) us ≈ 0.0333us, its effective signal bandwidth is 28MHz, and the subcarrier in frequency domain wherein outside effective bandwidth is used for carrying nil symbol (i.e. virtual subnet carrier wave).
Consider that the randomization treating transmission of digital signals is so that transmission information process, need carry out scrambling to business datum, scrambler is a binary pseudo random sequence of maximum length, and generator polynomial is defined as
G(x)＝1+x
14+x
15
The initial phase of this sequence is defined as 100101010000000.
Coding is carried out to scrambler result and obtains code word.The coding method adopted is forward error correction coding, and formed by outer code and ISN cascade, outer code is BCH code, and ISN is the LDPC code of encoder bit rate 0.5, code length 64800 bit.After carrying out Bit Interleave to the code word obtained, the complex symbol corresponding by constellation mapping generated codeword, the mode of constellation mapping is 64QAM.Time domain interweaves with adopting and encodes based on the convolutional interleave of constellation symbol, and time domain intertexture result adds pilot sub-carrier and virtual subnet carrier wave composition block of frequency domain data in precalculated position.Each frequency domain data block length is 8192, and wherein front 548 subcarriers are virtual subnet carrier wave, and in rear 7644 subcarriers, 1/6 carries frequency pilot sign, and 5/6 carries data symbol.Block of frequency domain data obtains time-domain data blocks through 8192 IDFT conversion.
Adopt CP-OFDM as framing technology, select the cyclic extensions of time-domain data blocks to fill as protection interval, protection interval overall length 512 symbols.Time-domain data blocks and protection interval group are synthesized the first signal frame.Owing to considering point-to-point forwarding communication in the present embodiment, predetermined receiver address information need be added by address plug-in unit after signal synchronous head.
After this, baseband signal is carried out up-conversion, gets the reprocessing such as real part and digital-to-analogue conversion, transmitted.
Carry out time domain framing after all four tunnel business being modulated all accordingly, Fig. 3 is shown in by frame structure schematic diagram, transmitted, and is coupled in power circuit and transmits.
Extract described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits.
First signal forwarding module carries out demodulation according to the corresponding modulation system of the signaling information in the first signal frame to described signaling information, obtains and forwards instruction.
According to the instruction in signaling information, the business information that each LED needs to send can be obtained, extract the subservice of corresponding time domain subchannel thus, for the business that user needs, adopt drive circuit as shown in Figure 2, voltage signal is converted to current signal, blank time slot is then sent for the unwanted business of user, and the signal of telecommunication business composition secondary signal frame that inserting signaling information will be extracted.For driving multiple different LED luminous and regulating luminous intensity, the application is not described in detail to this drive circuit.
Obtain the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to the signaling information demodulation of described light signal, and obtain the digital signal in described subchannel.
By PIN photoelectric detector receiving optical signals, and sensed light signal intensity, be converted to the signal of telecommunication.The signal of telecommunication completes automatic growth control in AFE (analog front end), analog-to-digital conversion, filtering, down-conversion obtain baseband signal, obtains transmission of digital signals through synchronous and demodulating and decoding.And that road program of demodulation oneself needs can be carried out according to the instruction of signaling information.When needing the business demand changing self, can be fed back to signal emission module by WiFi system, thus regulate the signaling information of transmitter module to change the business of self.
Embodiment three
The present embodiment provides the power line of the present invention's proposition and the application of communication means in the duplex communication system towards orientable Wideband Wireless Digital Communication of visible light communication fusion.In this duplex communication system, up link adopts the up realization of visible ray, the realization that communicates that down link adopts power line to combine with visible light communication, adopts multiple LED emission source, each emission source also transmits own location information except transfer of data, to complete positioning service.Details are as follows for involved method flow and transmission mode:
Predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit.
According to the quantity of the business of transmission, the first signal frame is divided into multiple time domain subchannel.Suppose that this transmitter module needs to carry out the clear digital TV broadcasting service transmission of four road signs, then each first signal frame is divided into four time domain subchannels, ascending time slot and signaling informations.Wherein each subchannel is responsible for transmission business; The transmission that ascending time slot is uplink information and reception provide condition; Signaling information is responsible for the corresponding business of upward signal feedback instruction according to user, and inserts the positional information of each LED emission source.For the subservice of the item of digital television transmission in subchannel, the mode of its modulation is with embodiment one.
Carry out time domain framing after all four tunnel business being modulated all accordingly, Fig. 3 is shown in by frame structure schematic diagram, transmitted, and is coupled in power circuit and transmits.
Extract described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits.
First signal forwarding module carries out demodulation according to the corresponding modulation system of the signaling information in the first signal frame to described signaling information, obtains and forwards instruction and location instruction.
According to the instruction in signaling information, the positional information of each LED can be obtained, for each LED emission source, using positional information as new signaling information, and and data slot, ascending time slot together adopts drive circuit as shown in Figure 2, and voltage signal is converted to current signal, and inserting signaling information forms secondary signal frame thus.For driving multiple different LED luminous and regulating luminous intensity, the application is not described in detail to this drive circuit.
Obtain the light signal in visible domain, according to the signaling information demodulation of described light signal, the subchannel that described signal of telecommunication business is corresponding, and the digital signal obtained in described subchannel is by PIN photoelectric detector receiving optical signals, and sensed light signal intensity, be converted to the signal of telecommunication.The signal of telecommunication completes automatic growth control in AFE (analog front end), analog-to-digital conversion, filtering, down-conversion obtain baseband signal after owing to there being multiple LED emission source, the data division except locating information that they are launched is identical, the signal of multipath channel that what therefore receiving terminal received be through impact, therefore need to carry out corresponding balanced operation, then obtain the positional information of transmission of digital signals and current LED through synchronous and demodulating and decoding.And that road program of demodulation oneself needs can be carried out according to the instruction of signaling information.Thus complete the determination of data receiver and position.
Embodiment four
Fig. 4 shows the communication system of a kind of power line and visible ray fusion, and as shown in Figure 4, this system comprises: signal emission module 31, signal forwarding module 32 and signal receiving module 33;
Signal emission module 31, for predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit;
Signal forwarding module 32, for extracting described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits;
Signal receiving module 33, for obtaining the signaling information of the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to described signaling information demodulation, and obtain the digital signal in described subchannel.
The communication system that a kind of power line described in the present embodiment and visible ray merge, may be used for the technical scheme performing embodiment of the method shown in Fig. 1, it realizes principle and technique effect is similar, repeats no more herein.
Claims (10)
1. a communication means for power line and visible ray fusion, is characterized in that, comprising:
Predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit;
Extract described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits;
Obtain the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to the signaling information demodulation of described light signal, and obtain the digital signal in described subchannel.
2. method according to claim 1, is characterized in that, described default transmission mode comprises: the working frequency range of communication system, maximum channel bandwidth, scrambler mode, coded system, constellation mapping mode, interleaving mode, modulation system and framing mode.
3. method according to claim 1, is characterized in that, described first signal frame that formed by signal to be transmitted after modulation is coupled in power circuit and transmits, and comprising:
Described signal to be transmitted is divided into multiple different subchannel according to time dimension.
4. method according to claim 3, it is characterized in that, described first signal frame is time-multiplexed form, and described first signal frame is divided into multiple time slot according to the time, described multiple different subchannel is time different the first signal frame, and described time slot comprises ascending time slot and descending time slot;
Described signal to be transmitted adopts OFDM modulation, and the mode of described composition first signal frame comprises ZP-OFDM, CP-OFDM, TDS-OFDM.
5. method according to claim 1, is characterized in that, described first signal frame of described extraction, and according to the signaling information in described first signal frame, obtains signal of telecommunication business, comprising:
When in described first signal frame without signaling information or described first signal frame in have signaling information and do not comprise the instruction of signal of telecommunication forwarding service in described signaling information time, then whole direct described signal of telecommunication business of forwarding;
Otherwise, carry out all directly forwarding or signal of telecommunication business described in selective forwarding according to the described signal of telecommunication forwarding service instruction in described signaling information;
When described signal of telecommunication forwarding service is designated as selective forwarding, then according to described signal of telecommunication forwarding service instruction, filtering is carried out to the described signal of telecommunication business of non-forwarded.
6. method according to claim 5, is characterized in that, described first signal frame of described extraction, and according to the signaling information in described first signal frame, obtains signal of telecommunication business, also comprise:
When not comprising the instruction of described signal of telecommunication forwarding service in described signaling information, then all signals of telecommunication that same power line connects are carried out all directly forwarding, all LED penetrate same visible light signal with taking place frequently simultaneously, form LED-based single frequency network communication pattern.
7. method according to claim 5, is characterized in that, the described subchannel that signal of telecommunication business is corresponding according to described signaling information demodulation, and obtains the digital signal in described subchannel, comprising:
Equilibrium treatment is carried out to the superposition of each LED light signal described in receiving.
8. method according to claim 4, is characterized in that, inserts the locating information of each LED in time division multiplexing frame, for realizing the location of visible ray.
9. method according to claim 1, is characterized in that, described method also comprises:
After obtaining the digital signal in described subchannel, signal receiving end can also send feedback information by ascending time slot to signal sending end;
Described signal receiving end sends feedback information by the form that Wifi, 3G/4G signal, visible ray are up to described signal sending end.
10. a communication system for power line and visible ray fusion, is characterized in that, comprising:
Signal emission module, for predetermined transport service is modulated according to the transmission mode preset, and by modulation afterwards signal to be transmitted form the first signal frame and be coupled in power circuit and transmit;
Signal forwarding module, for extracting described first signal frame, and according to the signaling information in described first signal frame, obtain signal of telecommunication business, by described signal of telecommunication business composition secondary signal frame, and by LED drive unit, the voltage signal in described secondary signal frame is converted to current signal, regulate the luminous intensity of each LED, described secondary signal frame is modulated to visible domain and transmits;
Signal receiving module, for obtaining the light signal in visible domain, the subchannel that signal of telecommunication business is corresponding according to the signaling information demodulation of described light signal, and obtain the digital signal in described subchannel.
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| CN201410555565.6A CN104270174B (en) | 2014-10-17 | Communication means that electric lines of force and visible ray merge and system |
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| CN201410555565.6A CN104270174B (en) | 2014-10-17 | Communication means that electric lines of force and visible ray merge and system |
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