CN105634599A - Data transmission method and system for visible light communication - Google Patents
Data transmission method and system for visible light communication Download PDFInfo
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- CN105634599A CN105634599A CN201610053281.6A CN201610053281A CN105634599A CN 105634599 A CN105634599 A CN 105634599A CN 201610053281 A CN201610053281 A CN 201610053281A CN 105634599 A CN105634599 A CN 105634599A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5161—Combination of different modulation schemes
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Abstract
The invention discloses a data transmission method and system for visible light communication. The method comprises the following steps of dividing a to-be-transmitted target data stream into M sub data streams, wherein the data attributes of the sub data streams are different and M is a positive integer which is greater than or equal to 2; determining a corresponding modulation strategy based on a target communication distance, wherein the sub data streams with the different data attributes under the modulation strategy are corresponding to different modulation modes; modulating each sub data stream through the respective modulation mode; overlapping each sub data stream on the corresponding visible light transmitting apparatus through the modulated data stream in order to obtain superimposed data streams on each visible light transmitting apparatus through; and transmitting each superimposed data stream through the respective visible light transmitting apparatus.
Description
Technical field
The present invention relates to technical field of visible light communication, particularly to data transmission method and the system of a kind of visible light communication.
Background technology
Visible light communication is since coming out, always to be capable of superelevation rate communication as its sharpest edges, but LED modulation bandwidth is narrower and nonlinear characteristic is the principal element of restriction visible light communication high speed development, such as, when reaching tens of rice or even hundreds of meters at communication distance, communication performance can sharply decline, and is even difficult to maintain basic communicating requirement.
Therefore, the technical scheme of the transmission performance that disclosure satisfy that under different transmission range is needed badly.
Summary of the invention
In view of this, it is an object of the invention to provide the data transmission method of a kind of visible light communication and system, the technical problem that during in order to solve the communication of prior art medium and long distance, communication performance sharply declines.
The invention provides the data transmission method of a kind of visible light communication, including:
Target data stream waiting for transmission is divided into M sub data flow, and the data attribute of each described sub data flow is different, and M is the positive integer more than or equal to 2;
Based target communication distance, it is determined that corresponding modulation strategy, the modulation system that under described modulation strategy, the sub data flow of different pieces of information attribute is corresponding different;
Each described sub data flow is modulated with its each self-corresponding modulation system;
Each described sub data flow data stream after ovennodulation is overlapped on corresponding visible optical sending apparatus, obtains the superposition of data stream on each described visible optical sending apparatus;
Each described superposition of data stream is transmitted by its each self-corresponding visible optical sending apparatus.
Said method, it is preferred that target data stream waiting for transmission is divided into multiple sub data flow, including:
Based on the data weighting of data contained in target data stream waiting for transmission, described target data stream being divided into multiple sub data flow, the data weighting of each described sub data flow varies in size.
Said method, it is preferred that based target communication distance, it is determined that modulation strategy, including:
When described destinations traffic distance is more than default first threshold, based on data weighting, determining the modulation system of each described sub data flow, wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is more big;
When described destinations traffic distance is less than described first threshold, based on data weighting, determining the modulation system of each described sub data flow, wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is more big.
Said method, it is preferred that also include:
Utilize visible optical receiving device to receive each described visible ray and send the superposition of data stream of device transmission;
Data in described superposition of data stream are carried out detection decoding, obtains decoded data stream.
Said method, it is preferred that described data in described superposition of data stream are carried out detects decoding, obtains decoded data stream, including:
M data in described superposition of data stream are carried out decoupling process;
Utilize ML (MaximumLikelihood, maximum likelihood) decoded mode, based on i-th data, the i-th-1 data being decoded, to obtain the decoded data stream of each described superposition of data stream, i is the positive integer more than or equal to 2 and less than or equal to M.
Present invention also offers the data transmission system of a kind of visible light communication, including:
Data dividing unit, for target data stream waiting for transmission is divided into M sub data flow, the data attribute of each described sub data flow is different, and M is the positive integer more than or equal to 2;
Policy determining unit, for based target communication distance, it is determined that modulation strategy, the modulation system that under described modulation strategy, the sub data flow of different pieces of information attribute is corresponding different;
Data modulating unit, for being modulated with its each self-corresponding modulation system each described subdata;
Data investigation unit, for being overlapped on corresponding visible optical sending apparatus by each described sub data flow data stream after ovennodulation, obtains the superposition of data stream on each described visible optical sending apparatus;
Data transmission unit, for being transmitted each described superposition of data stream by its each self-corresponding visible optical sending apparatus.
Said system, it is preferred that described data dividing unit includes:
Weight divides subelement, for the data weighting based on data contained in target data stream waiting for transmission, described target data stream is divided into multiple sub data flow, and the data weighting of each described sub data flow varies in size.
Said system, it is preferred that described policy determining unit includes:
First determines subelement, for when described destinations traffic distance is more than default first threshold, based on data weighting, determine the modulation system of each described sub data flow, wherein, in the modulation system that data weighting is more big sub data flow is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is more big;
Second determines subelement, for when described destinations traffic distance is less than described first threshold, based on data weighting, determine the modulation system of each described sub data flow, wherein, in the modulation system that data weighting is more big sub data flow is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is more big.
Said system, it is preferred that also include:
Data receipt unit, sends the superposition of data stream of device transmission for utilizing visible optical receiving device to receive each described visible ray;
Data decoding unit, for the data in described superposition of data stream carry out detection decoding, obtains decoded data stream.
Said system, it is preferred that described data decoding unit includes:
Decoupling processes subelement, for M data in described superposition of data stream are carried out decoupling process;
Recurrence decoding subelement, is used for utilizing ML decoded mode, based on i-th data, the i-th-1 data is decoded, and to obtain the decoded data stream of each described superposition of data stream, i is the positive integer more than or equal to 2 and less than or equal to M.
From such scheme, the data transmission method of a kind of visible light communication provided by the invention and system, for different destinations traffic distances, after in target data stream, the sub data flow of different pieces of information attribute is modulated with different modulation systems, it is transmitted again through visible optical sending apparatus such as LED etc., and then realize different communication apart from lower corresponding modulation transmission, meet corresponding communication performance demand, such as closely descending high-speed communication and the modulation communication of remote lower reliable communication, the problem that when solving the communication of prior art medium and long distance, communication performance sharply declines, realize the object of the invention.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
The flow chart of the data transmission method of a kind of visible light communication that Fig. 1 provides for the embodiment of the present invention one;
The flow chart of the data transmission method of a kind of visible light communication that Fig. 2 provides for the embodiment of the present invention two;
The partial process view of the data transmission method of a kind of visible light communication that Fig. 3 provides for the embodiment of the present invention three;
The application example figure of Fig. 4 a��Fig. 4 h respectively embodiment of the present invention;
The flow chart of the data transmission method of a kind of visible light communication that Fig. 5 provides for the embodiment of the present invention four;
Fig. 6 is the partial process view of the embodiment of the present invention four;
Fig. 7 a and Fig. 7 b is other application example figure of the embodiment of the present invention;
The structural representation of the data transmission system of a kind of visible light communication that Fig. 8 provides for the embodiment of the present invention five;
The structural representation of the data communication system of a kind of visible light communication that Fig. 9 provides for the embodiment of the present invention six;
The part-structure schematic diagram of the data transmission system of a kind of visible light communication that Figure 10 provides for the embodiment of the present invention seven;
The structural representation of the data transmission system of a kind of visible light communication that Figure 11 provides for the embodiment of the present invention eight;
Figure 12 is the part-structure schematic diagram of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
With reference to Fig. 1, the flow chart of data transmission method for a kind of visible light communication that the embodiment of the present invention one provides, wherein, described method is suitable in the Delamination Transmission carrying out corresponding modulation strategy the scenes such as visible light communication such as traffic light communication for different communication distances.
Concrete, in the present embodiment, described method may comprise steps of:
Step 101: target data stream waiting for transmission is divided into M sub data flow.
Wherein, the data attribute of each described sub data flow is different, and M is the positive integer more than or equal to 2. Here data attribute can be characterize the attribute of the importance of data in described target data stream.
It is to say, described target data stream is divided into M sub data flow by the importance according to data in the present embodiment.
It should be noted that, the number of the sub data flow divided in the present embodiment receives the restriction of total transmitting power of the system realizing the present embodiment, when total transmitting power is certain, each described sub data flow is modulated transmitting the power distributed and differing, but can not exceeding the upper limit, otherwise systematic function will sharply decline affects data transmission.
Step 102: based target communication distance, it is determined that corresponding modulation strategy.
Wherein, under described modulation strategy, the modulation system that the sub data flow of different pieces of information attribute is corresponding different. It is to say, under different communication distances, determine different modulation strategies in the present embodiment, under this modulation strategy, the sub data flow for different pieces of information attribute determines different modulation systems.
It should be noted that, to in the different each self-corresponding modulation strategies of communication distance, the modulation system that the sub data flow of same data attribute is corresponding different, thus meets under different transmission range the requirement of different transmission performances to sub data flow same in target data stream; In same modulation strategy, the modulation system that the sub data flow of different pieces of information attribute is corresponding different, thus meet the transmission demand of the sub data flow of different pieces of information attribute.
Step 103: each described sub data flow is modulated with its each self-corresponding modulation system.
Wherein, modulation system here is different, refers to that the combinations of modulation mode of diversity and/or multiplexing is different, is different from analog-modulated or the difference of digital modulation, continuous wave modulation or pulse modulated modulation system.
Being transmitted respectively with multiple transmission equipment by data acquisition it should be noted that diversity modulation system refers to, these data are all transmitted by each transmission equipment, to meet the reliability requirement of data transmission; Multiplexing modulation system refers to and adopts multiple transmission equipment to be transmitted respectively after data are divided into many parts, and a data in each transmission device transmission these data a, to meet the high efficiency demand of data transmission.
Step 104: each described sub data flow data stream after ovennodulation is overlapped on corresponding visible optical sending apparatus, obtains the superposition of data stream on each described visible optical sending apparatus.
Wherein, described visible optical sending apparatus can be that LED lamp bead etc. sends equipment, and visible optical sending apparatus here can be multiple, such as 16 or 32 etc.
It should be noted that, each described sub data flow is distributed the visible optical sending apparatus of respective numbers by the present embodiment, each described sub data flow is modulated, namely based on its modulation system, each described sub data flow is transferred on corresponding visible optical sending apparatus, thus, each described visible optical sending apparatus would be likely to occur the data after the modulation of multiple sub data flow, and then the present embodiment its existing sub data flow of superposition on each described visible optical sending apparatus, obtain the superposition of data stream on each described visible optical sending apparatus, as is shown in fig. 4 a, first target data stream is carried out serioparallel exchange by the present embodiment, afterwards, carry out sub data flow division again, obtain M shell data (i.e. above-mentioned M sub data flow) s1��sM, after ovennodulation, be added to corresponding visible optical sending apparatus, and then is transmitted through visible light channel.
Step 105: each described superposition of data stream is transmitted by its each self-corresponding visible optical sending apparatus.
It is to say, in the present embodiment, on each described visible optical sending apparatus after its existing sub data flow of superposition, these visible optical sending apparatus the superposition of data stream of its correspondence is transmitted.
Concrete, described visible ray sends equipment utilization visible light channel and transmits described superposition of data stream.
From such scheme, the data transmission method of a kind of visible light communication that the embodiment of the present invention one provides, for different destinations traffic distances, after in target data stream, the sub data flow of different pieces of information attribute is modulated with different modulation systems, it is transmitted again through visible optical sending apparatus such as LED etc., and then realize different communication apart from lower corresponding modulation transmission, meet corresponding communication performance demand, such as closely descending high-speed communication and the modulation communication of remote lower reliable communication, the problem that when solving the communication of prior art medium and long distance, communication performance sharply declines, realize the present embodiment purpose.
In implementing, described data attribute can represent with the data weighting of sub data flow, and described data weighting is more big, and sub data flow belonging to it is more high to the importance of user, and data weighting is more little, and sub data flow belonging to it is more low to the importance of user.
Thus, with reference to Fig. 2, the flowchart of the data transmission method of a kind of visible light communication provided for the embodiment of the present invention two, wherein, described step 101 can be realized by following steps:
Step 111: based on the data weighting of data contained in target data stream waiting for transmission, described target data stream is divided into multiple sub data flow.
Wherein, the data weighting of each described sub data flow varies in size, that is, data weighting according to data contained in described target data stream in the present embodiment, judge the sub data flow belonging to same data weighting, again the sub data flow of these same data weightings is divided into together, obtains the sub data flow that data weighting varies in size.
Based on previous embodiment, with reference to Fig. 3, for the flowchart of step 102 in the data transmission method of a kind of visible light communication of the embodiment of the present invention three offer, wherein, described step 102 can be realized by following steps:
Step 121: when described destinations traffic distance is more than default first threshold, based on data weighting, it is determined that the modulation system of each described sub data flow.
Wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is bigger, thus, in the modulation system that data weighting is more little sub data flow is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is bigger.
It should be noted that, when described destinations traffic distance is more than described first threshold, show that described destinations traffic distance is bigger, distant between transmitting terminal and receiving terminal, now need the transmission reliability of the data ensureing that importance is higher, thus, the sub data flow that data weighting is bigger is needed to adopt more visible optical sending apparatus to carry out diversity modulation, namely more visible optical sending apparatus is utilized all these sub data flows to be transmitted simultaneously, to ensure that distant transmitting terminal is able to receive that the sub data flow that these importances are higher.
Such as, described visible optical sending apparatus such as LED has 16, target data stream described in the present embodiment is divided into three sub data flows: a, b, c, weight size order is: a > b > c, when described destinations traffic distance is bigger, sub data flow a utilizes 16 visible optical sending apparatus carry out diversity modulation transmissions, it is ensured that the maximum sub data flow a of weight can accurate delivery to receiving terminal, as shown in fig 4b, etc.
Step 122: when described destinations traffic distance is less than described first threshold, based on data weighting, it is determined that the modulation system of each described sub data flow.
Wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is bigger, accordingly, in the modulation system that data weighting is more little sub data flow is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is more big.
It should be noted that, when described destinations traffic distance is less than described first threshold, show that described destinations traffic distance is less, close together between transmitting terminal and receiving terminal, now need the transmission high efficiency of the data ensureing that importance is higher, thus, the sub data flow that data weighting is bigger is needed to adopt more visible optical sending apparatus to carry out multiplexing modulation, namely utilizing more visible optical sending apparatus that these sub data flow piecemeals or portioning are transmitted, the transmitting terminal to ensure close together can quickly receive the sub data flow that these importances are higher.
Such as, described visible optical sending apparatus such as LED has 16, target data stream described in the present embodiment is divided into three sub data flows: a, b, c, weight size order is: a > b > c, when described destinations traffic distance is less, sub data flow a is divided into 16 parts of a1��a16, utilizes 16 visible optical sending apparatus to carry out multiplexing modulation transmissions, ensure that the maximum sub data flow a of weight can be transferred to receiving terminal efficiently, as shown in fig. 4c; Sub data flow b is divided into 4 parts of (multiplexing) b1��b4, more every one's share of expenses for a joint undertaking data are fluently carried out diversity modulation transmissions with 4 visible optical sending apparatus, as shown in figure 4d; Sub data flow c utilize 16 visible optical sending apparatus carry out diversity modulation transmissions, it is ensured that the minimum sub data flow c of weight can be transferred to receiving terminal accurately, as illustrated in figure 4e.
In implementing, the present embodiment is not limited in the judgement of described first threshold, the present embodiment restriction to described first threshold, can according to different communication distances only for characterizing the present embodiment, take different modulation strategies, to ensure the data efficient in short range transmission and the data reliability in long-distance transmissions, as shown in Fig. 4 f, character due to visible light communication, in actual applications, different transmission ranges is different to data reliability requirement, in d1��d3, data reliability requirement is increased by each distance successively, reason is in that: receiving terminal range transmission end is more near, the transmission performance of visible ray is more good, data transmission credibility is less demanding, receiving terminal range transmission end is more remote, it is seen that the transmission performance of light is poor, requires higher to data transmission credibility.
With reference to Fig. 5, the flowchart of the data transmission method of a kind of visible light communication provided for the embodiment of the present invention four, wherein, after described step 105, described method can also comprise the following steps:
Step 106: utilize visible optical receiving device to receive each described visible ray and send the superposition of data stream of device transmission.
Concrete, the present embodiment can utilize magnifier and filter lens first the superposition of data stream in visible light channel is amplified and optical filtering processes, and then by visible optical receiving device, these superposition of data streams are received.
Step 107: the data in described superposition of data stream are carried out detection decoding, obtains decoded data stream.
Wherein, first the superposition of data received can be carried out noise filtering process by the present embodiment, then carry out detection decoding, as shown in Fig. 4 g, finally carry out parallel-serial conversion, obtain output data.
It should be noted that visible optical sending apparatus described in the present embodiment exists each described sub data flow data after ovennodulation, thus, described superposition of data stream have M data.
As shown in Fig. 4 h, divide M data stream to carry out modulation overlap-add procedure at transmitting terminal, after being transmitted by visible light channel, after lens, be received and demodulate i.e. decoding at receiving terminal and process, obtain data.
Concrete, as shown in Figure 6, step 107 described in the present embodiment can be realized by following steps:
Step 171: M data in described superposition of data stream are carried out decoupling process.
The i-th-1 data is decoded by step 172: utilize ML decoded mode based on i-th data, to obtain the decoded data stream of each described superposition of data stream.
Wherein, i is the positive integer more than or equal to 2 and less than or equal to M.
It is to say, as shown in Figure 7 a, to first M data being carried out decoupling process in the present embodiment so that when i-th data assume known a priori, complete the judgement to i-1 data; The judgement of the judgement decoding recursion of M data to M-1 with m-th data is decoded by the mode then adopting recurrence, individual and m-th data the judgement decoding of M-1 adopts the fast decoding mode shown in Fig. 7 b to decode, and completes the decoding of M data finally by the mode recalled.
With reference to Fig. 8, the structural representation of the data transmission system of a kind of visible light communication provided for the embodiment of the present invention five, wherein, described system can include following structure:
Data dividing unit 801, for being divided into M sub data flow by target data stream waiting for transmission.
Wherein, the data attribute of each described sub data flow is different, and M is the positive integer more than or equal to 2. Here data attribute can be characterize the attribute of the importance of data in described target data stream.
It is to say, described target data stream is divided into M sub data flow by the importance according to data in the present embodiment.
It should be noted that, the number of the sub data flow divided in the present embodiment receives the restriction of total transmitting power of the system realizing the present embodiment, when total transmitting power is certain, each described sub data flow is modulated transmitting the power distributed and differing, but can not exceeding the upper limit, otherwise systematic function will sharply decline affects data transmission.
Policy determining unit 802, for based target communication distance, it is determined that modulation strategy.
Wherein, under described modulation strategy, the modulation system that the sub data flow of different pieces of information attribute is corresponding different. It is to say, under different communication distances, determine different modulation strategies in the present embodiment, under this modulation strategy, the sub data flow for different pieces of information attribute determines different modulation systems.
It should be noted that, to in the different each self-corresponding modulation strategies of communication distance, the modulation system that the sub data flow of same data attribute is corresponding different, thus meets under different transmission range the requirement of different transmission performances to sub data flow same in target data stream; In same modulation strategy, the modulation system that the sub data flow of different pieces of information attribute is corresponding different, thus meet the transmission demand of the sub data flow of different pieces of information attribute.
Data modulating unit 803, for being modulated with its each self-corresponding modulation system each described subdata.
Wherein, modulation system here is different, refers to that the combinations of modulation mode of diversity and/or multiplexing is different, is different from analog-modulated or the difference of digital modulation, continuous wave modulation or pulse modulated modulation system.
Being transmitted respectively with multiple transmission equipment by data acquisition it should be noted that diversity modulation system refers to, these data are all transmitted by each transmission equipment, to meet the reliability requirement of data transmission; Multiplexing modulation system refers to and adopts multiple transmission equipment to be transmitted respectively after data are divided into many parts, and a data in each transmission device transmission these data a, to meet the high efficiency demand of data transmission.
Data investigation unit 804, for being overlapped on corresponding visible optical sending apparatus by each described sub data flow data stream after ovennodulation, obtains the superposition of data stream on each described visible optical sending apparatus.
Wherein, described visible optical sending apparatus can be that LED lamp bead etc. sends equipment, and visible optical sending apparatus here can be multiple, such as 16 or 32 etc.
It should be noted that, each described sub data flow is distributed the visible optical sending apparatus of respective numbers by the present embodiment, each described sub data flow is modulated, namely based on its modulation system, each described sub data flow is transferred on corresponding visible optical sending apparatus, thus, each described visible optical sending apparatus would be likely to occur the data after the modulation of multiple sub data flow, and then the present embodiment its existing sub data flow of superposition on each described visible optical sending apparatus, obtain the superposition of data stream on each described visible optical sending apparatus, as is shown in fig. 4 a, first target data stream is carried out serioparallel exchange by the present embodiment, afterwards, carry out sub data flow division again, obtain M shell data (i.e. above-mentioned M sub data flow) s1��sM, after ovennodulation, be added to corresponding visible optical sending apparatus, and then is transmitted through visible light channel.
Data transmission unit 805, for being transmitted each described superposition of data stream by its each self-corresponding visible optical sending apparatus.
It is to say, in the present embodiment, on each described visible optical sending apparatus after its existing sub data flow of superposition, these visible optical sending apparatus the superposition of data stream of its correspondence is transmitted.
Concrete, described visible ray sends equipment utilization visible light channel and transmits described superposition of data stream.
From such scheme, the data transmission system of a kind of visible light communication that the embodiment of the present invention five provides, for different destinations traffic distances, after in target data stream, the sub data flow of different pieces of information attribute is modulated with different modulation systems, it is transmitted again through visible optical sending apparatus such as LED etc., and then realize different communication apart from lower corresponding modulation transmission, meet corresponding communication performance demand, such as closely descending high-speed communication and the modulation communication of remote lower reliable communication, the problem that when solving the communication of prior art medium and long distance, communication performance sharply declines, realize the present embodiment purpose.
In implementing, described data attribute can represent with the data weighting of sub data flow, and described data weighting is more big, and sub data flow belonging to it is more high to the importance of user, and data weighting is more little, and sub data flow belonging to it is more low to the importance of user.
Thus, with reference to Fig. 9, the structural representation of the data communication system of a kind of visible light communication provided for the embodiment of the present invention six, wherein, described data dividing unit 801 can be realized by following structure:
Weight divides subelement 811, for the data weighting based on data contained in target data stream waiting for transmission, described target data stream is divided into multiple sub data flow.
Wherein, the data weighting of each described sub data flow varies in size, that is, data weighting according to data contained in described target data stream in the present embodiment, judge the sub data flow belonging to same data weighting, again the sub data flow of these same data weightings is divided into together, obtains the sub data flow that data weighting varies in size.
Based on previous embodiment, with reference to Figure 10, for the structural representation of policy determining unit 802 described in the data transmission system of a kind of visible light communication of the embodiment of the present invention seven offer, wherein, described policy determining unit 802 can be realized by following structure:
First determines subelement 821, for when described destinations traffic distance is more than default first threshold, based on data weighting, it is determined that the modulation system of each described sub data flow.
Wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is more big, thus, in the modulation system that data weighting is more little sub data flow is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is bigger.
It should be noted that, when described destinations traffic distance is more than described first threshold, show that described destinations traffic distance is bigger, distant between transmitting terminal and receiving terminal, now need the transmission reliability of the data ensureing that importance is higher, thus, the sub data flow that data weighting is bigger is needed to adopt more visible optical sending apparatus to carry out diversity modulation, namely more visible optical sending apparatus is utilized all these sub data flows to be transmitted simultaneously, to ensure that distant transmitting terminal is able to receive that the sub data flow that these importances are higher.
Such as, described visible optical sending apparatus such as LED has 16, target data stream described in the present embodiment is divided into three sub data flows: a, b, c, weight size order is: a > b > c, when described destinations traffic distance is bigger, sub data flow a utilizes 16 visible optical sending apparatus carry out diversity modulation transmissions, it is ensured that the maximum sub data flow a of weight can accurate delivery to receiving terminal, as shown in fig 4b, etc.
Second determines subelement 822, for when described destinations traffic distance is less than described first threshold, based on data weighting, it is determined that the modulation system of each described sub data flow.
Wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is more big, accordingly, in the modulation system that data weighting is more little sub data flow is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is more big.
It should be noted that, when described destinations traffic distance is less than described first threshold, show that described destinations traffic distance is less, close together between transmitting terminal and receiving terminal, now need the transmission high efficiency of the data ensureing that importance is higher, thus, the sub data flow that data weighting is bigger is needed to adopt more visible optical sending apparatus to carry out multiplexing modulation, namely utilizing more visible optical sending apparatus that these sub data flow piecemeals or portioning are transmitted, the transmitting terminal to ensure close together can quickly receive the sub data flow that these importances are higher.
Such as, described visible optical sending apparatus such as LED has 16, target data stream described in the present embodiment is divided into three sub data flows: a, b, c, weight size order is: a > b > c, when described destinations traffic distance is less, sub data flow a is divided into 16 parts of a1��a16, utilizes 16 visible optical sending apparatus to carry out multiplexing modulation transmissions, ensure that the maximum sub data flow a of weight can be transferred to receiving terminal efficiently, as shown in fig. 4c; Sub data flow b is divided into 4 parts of (multiplexing) b1��b4, more every one's share of expenses for a joint undertaking data are fluently carried out diversity modulation transmissions with 4 visible optical sending apparatus, as shown in figure 4d; Sub data flow c utilize 16 visible optical sending apparatus carry out diversity modulation transmissions, it is ensured that the minimum sub data flow c of weight can be transferred to receiving terminal accurately, as illustrated in figure 4e.
In implementing, the present embodiment is not limited in the judgement of described first threshold, the present embodiment restriction to described first threshold, can according to different communication distances only for characterizing the present embodiment, take different modulation strategies, to ensure the data efficient in short range transmission and the data reliability in long-distance transmissions, as shown in Fig. 4 f, character due to visible light communication, in actual applications, different transmission ranges is different to data reliability requirement, in d1��d3, data reliability requirement is increased by each distance successively, reason is in that: receiving terminal range transmission end is more near, the transmission performance of visible ray is more good, data transmission credibility is less demanding, receiving terminal range transmission end is more remote, it is seen that the transmission performance of light is poor, requires higher to data transmission credibility.
With reference to Figure 11, the structural representation of the data transmission system of a kind of visible light communication provided for the embodiment of the present invention eight, wherein, described system can also include following structure:
Data receipt unit 806, sends the superposition of data stream of device transmission for utilizing visible optical receiving device to receive each described visible ray.
Concrete, the present embodiment can utilize magnifier and filter lens first the superposition of data stream in visible light channel is amplified and optical filtering processes, and then by visible optical receiving device, these superposition of data streams are received.
Data decoding unit 807, for the data in described superposition of data stream carry out detection decoding, obtains decoded data stream.
Wherein, first the superposition of data received can be carried out noise filtering process by the present embodiment, then carry out detection decoding, as shown in Fig. 4 g, finally carry out parallel-serial conversion, obtain output data.
It should be noted that visible optical sending apparatus described in the present embodiment exists each described sub data flow data after ovennodulation, thus, described superposition of data stream have M data.
As shown in Fig. 4 h, divide M data stream to carry out modulation overlap-add procedure at transmitting terminal, after being transmitted by visible light channel, after lens, be received and demodulate i.e. decoding at receiving terminal and process, obtain data.
Concrete, with reference to Figure 12, for the structural representation of data decoding unit described in the embodiment of the present invention 807, wherein, described data decoding unit 807 can include following structure:
Decoupling processes subelement 871, for M data in described superposition of data stream are carried out decoupling process.
Recurrence decoding subelement 872, is used for utilizing ML decoded mode, based on i-th data, the i-th-1 data is decoded, to obtain the decoded data stream of each described superposition of data stream.
Wherein, i is the positive integer more than or equal to 2 and less than or equal to M.
It is to say, as shown in Figure 7 a, to first M data being carried out decoupling process in the present embodiment so that when i-th data assume known a priori, complete the judgement to i-1 data; The judgement of the judgement decoding recursion of M data to M-1 with m-th data is decoded by the mode then adopting recurrence, individual and m-th data the judgement decoding of M-1 adopts the fast decoding mode shown in Fig. 7 b to decode, and completes the decoding of M data finally by the mode recalled.
If the function described in the present embodiment method is using the form realization of SFU software functional unit and as independent production marketing or use, it is possible to be stored in a computing equipment read/write memory medium. Based on such understanding, part or the part of this technical scheme that prior art is contributed by the embodiment of the present invention can embody with the form of software product, this software product is stored in a storage medium, including some instructions with so that a computing equipment (can be personal computer, server, mobile computing device or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention. And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment same or similar part mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention. The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. the data transmission method of a visible light communication, it is characterised in that including:
Target data stream waiting for transmission is divided into M sub data flow, and the data attribute of each described sub data flow is different, and M is the positive integer more than or equal to 2;
Based target communication distance, it is determined that corresponding modulation strategy, the modulation system that under described modulation strategy, the sub data flow of different pieces of information attribute is corresponding different;
Each described sub data flow is modulated with its each self-corresponding modulation system;
Each described sub data flow data stream after ovennodulation is overlapped on corresponding visible optical sending apparatus, obtains the superposition of data stream on each described visible optical sending apparatus;
Each described superposition of data stream is transmitted by its each self-corresponding visible optical sending apparatus.
2. method according to claim 1, it is characterised in that target data stream waiting for transmission is divided into multiple sub data flow, including:
Based on the data weighting of data contained in target data stream waiting for transmission, described target data stream being divided into multiple sub data flow, the data weighting of each described sub data flow varies in size.
3. method according to claim 2, it is characterised in that based target communication distance, it is determined that modulation strategy, including:
When described destinations traffic distance is more than default first threshold, based on data weighting, determining the modulation system of each described sub data flow, wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is more big;
When described destinations traffic distance is less than described first threshold, based on data weighting, determining the modulation system of each described sub data flow, wherein, in the modulation system that sub data flow that data weighting is more big is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is more big.
4. method according to claim 1 and 2, it is characterised in that also include:
Utilize visible optical receiving device to receive each described visible ray and send the superposition of data stream of device transmission;
Data in described superposition of data stream are carried out detection decoding, obtains decoded data stream.
5. method according to claim 4, it is characterised in that described data in described superposition of data stream are carried out detects decoding, obtains decoded data stream, including:
M data in described superposition of data stream are carried out decoupling process;
Utilize ML (MaximumLikelihood, maximum likelihood) decoded mode, based on i-th data, the i-th-1 data being decoded, to obtain the decoded data stream of each described superposition of data stream, i is the positive integer more than or equal to 2 and less than or equal to M.
6. the data transmission system of a visible light communication, it is characterised in that including:
Data dividing unit, for target data stream waiting for transmission is divided into M sub data flow, the data attribute of each described sub data flow is different, and M is the positive integer more than or equal to 2;
Policy determining unit, for based target communication distance, it is determined that modulation strategy, the modulation system that under described modulation strategy, the sub data flow of different pieces of information attribute is corresponding different;
Data modulating unit, for being modulated with its each self-corresponding modulation system each described subdata;
Data investigation unit, for being overlapped on corresponding visible optical sending apparatus by each described sub data flow data stream after ovennodulation, obtains the superposition of data stream on each described visible optical sending apparatus;
Data transmission unit, for being transmitted each described superposition of data stream by its each self-corresponding visible optical sending apparatus.
7. system according to claim 6, it is characterised in that described data dividing unit includes:
Weight divides subelement, for the data weighting based on data contained in target data stream waiting for transmission, described target data stream is divided into multiple sub data flow, and the data weighting of each described sub data flow varies in size.
8. system according to claim 7, it is characterised in that described policy determining unit includes:
First determines subelement, for when described destinations traffic distance is more than default first threshold, based on data weighting, determine the modulation system of each described sub data flow, wherein, in the modulation system that data weighting is more big sub data flow is corresponding, the quantity of the visible optical sending apparatus that diversity modulation is corresponding is more big;
Second determines subelement, for when described destinations traffic distance is less than described first threshold, based on data weighting, determine the modulation system of each described sub data flow, wherein, in the modulation system that data weighting is more big sub data flow is corresponding, the quantity of the visible optical sending apparatus that multiplexing modulation is corresponding is more big.
9. the system according to claim 6 or 7, it is characterised in that also include:
Data receipt unit, sends the superposition of data stream of device transmission for utilizing visible optical receiving device to receive each described visible ray;
Data decoding unit, for the data in described superposition of data stream carry out detection decoding, obtains decoded data stream.
10. system according to claim 9, it is characterised in that described data decoding unit includes:
Decoupling processes subelement, for M data in described superposition of data stream are carried out decoupling process;
Recurrence decoding subelement, is used for utilizing ML decoded mode, based on i-th data, the i-th-1 data is decoded, and to obtain the decoded data stream of each described superposition of data stream, i is the positive integer more than or equal to 2 and less than or equal to M.
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