CN105743575A - Signal processing method and device - Google Patents
Signal processing method and device Download PDFInfo
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- CN105743575A CN105743575A CN201610049295.0A CN201610049295A CN105743575A CN 105743575 A CN105743575 A CN 105743575A CN 201610049295 A CN201610049295 A CN 201610049295A CN 105743575 A CN105743575 A CN 105743575A
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- signal
- transmitting terminal
- transmitting
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- visible light
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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
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
Abstract
The invention provides a signal processing method and device. Transmission times of transmitting ends can be determined according to a quantity of the transmitting ends, wherein the transmission times of the transmitting ends are different, and signals transmitted by other transmitting ends in all transmitting ends are overlapped with signals transmitted by a reference transmitting end. When the transmitting ends transmit signals in the way, a user terminal positioned in an indoor visible light communication MU-MISO (Multi-User Multi-Input Single-Output) system can recognize which transmitting ends transmit the signals, so that interference among the signals can be lowered by the transmitting ends without adoption of a channel encoding technology. Moreover, when the transmitting ends transmit the signals in the abovementioned way, each of the transmitting ends can transmit the signals to the user terminal based on respective transmission times, so that the user terminal receives a plurality of signals at a certain moment, namely, a plurality of signals are transmitted in a channel at the certain moment; more data can be transmitted on a limited bandwidth at the certain moment; and a resource utilization ratio is increased.
Description
Technical field
The invention belongs to technical field of visible light communication, in particular, particularly relate to a kind of signal processing method and dress
Put.
Background technology
At present, radio communication gradually plays the part of the most important role in people live, and most radio communication should
For family, office and other indoor scenarios, but owing to the interference in short supply and internetwork of Radio Resource limits channel radio
The capacity of letter, produces a kind of visible light communication for this.
Wherein visible light communication refers to that the light utilizing visible light wave range, as information carrier, the most directly transmits optical signal
Communication mode, it is as a kind of short-range High-Speed Communication Technique, can be used to solve in radio communication " end access " and
The problem of " degree of depth covering ".And along with the upgrading of Lighting Industry, LED (Light-Emitting Diode, Light-Emitting
Diode) it is increasingly becoming the leading of illumination market by its low-carbon (LC), environmental protection, green advantage, thus permissible in visible light communication
Utilize LED as transmitting device, it is achieved indoor communications and the fusion of room lighting.For indoor visible light communication MU-MISO
The visible light communication of (multi-user's multi output single input, Multi-User Multi-Input Single-Output) system needs
Asking, multiple LED can be connected in modem by the electric lines of force in existing powerline systems, it is achieved powerline systems
Fusion with visible light communication.
But for indoor visible light communication MU-MISO system, owing to there is interference between the signal that LED sends
Systematic function is reduced, generally uses channel coding technology for this indoor visible light communication MU-MISO system, such as DPC (dirty paper
Coding, Dirty Paper Coding), any one mode in ZF transfer pre-coding and tdma reduce letter
Interference between number.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of signal processing method and device, it is to avoid use at transmitting terminal
Channel coding technology reduces the interference between signal.Technical scheme is as follows:
First aspect, the present invention provides a kind of signal processing method, is applied to indoor visible light communication multi-user's multi input
In single output MU-MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal,
Wherein, each light fixture can send letter as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Number, described method includes:
Determining in described indoor visible light communication MU-MISO system can be as the light fixture of transmitting terminal and determine described transmitting
The quantity of end；
According to the quantity of described transmitting terminal, determining the launch time of each described transmitting terminal, wherein said launch time is used
In the time of the corresponding described transmitting terminal proceed-to-send signal of instruction, the described launch time of each described transmitting terminal each the most not phase
With, and have lap between signal and the signal of reference emission end transmission that in all transmitting terminals, other transmitting terminals send, institute
Stating reference emission end is a transmitting terminal in all transmitting terminals, and other transmitting terminals are except described reference emission in all transmitting terminals
Transmitting terminal outside end；
Launch time based on each described transmitting terminal, described transmitting terminal is indicated to start in corresponding described launch time
Send signal.
Preferably, according to the quantity of described transmitting terminal, determine the launch time of each described transmitting terminal, including:
In whole described transmitting terminals, determine first described transmitting terminal sending signal and determine described first
Send the transmission cycle of the described transmitting terminal of signal；
According to quantity and the transmission cycle of described transmitting terminal of described transmitting terminal, obtain other transmitting terminals the most described first
The transmitting time delay of the described transmitting terminal of individual transmission signal, the transmitting time delay of other transmitting terminals wherein said is less than described transmission week
Phase so that the described launch time of each described transmitting terminal is different, and the signal that sends of other transmitting terminals with first
Lap is had between the signal that the described transmitting terminal of the number of delivering letters sends；
Launch time relative with other transmitting terminals described first based on described first described transmitting terminal sending signal
The transmitting time delay of the described transmitting terminal of individual transmission signal, obtains the launch time of other transmitting terminals.
Preferably, the described quantity according to described transmitting terminal and the transmission cycle of described transmitting terminal, obtain other transmitting terminals
The transmitting time delay of the most described first described transmitting terminal sending signal, including:
According to formulaObtain the transmitting of the most described first the described transmitting terminal sending signal of other transmitting terminals
Time delay coefficient, wherein j is jth transmitting terminal, and N is the quantity of described transmitting terminal；
When obtaining the transmitting of the most described first the described transmitting terminal sending signal of other transmitting terminals according to formula ζ T
Prolonging, wherein T is the transmission cycle of described first described transmitting terminal sending signal.
Second aspect, the present invention provides a kind of signal processing method, is applied to indoor visible light communication multi-user's multi input
In single output MU-MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal,
Wherein, each light fixture can send letter as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Number, described method includes:
The signal transmitting every path channels carries out high sampling, obtains different sampling instant corresponding the adopting of each described signal
Sample signal, wherein the signal of every path channels transmission is that in described indoor visible light communication MU-MISO system, corresponding transmitting terminal sends；
Obtain the reception signal of each sampling instant, the acquisition process receiving signal of the most any one of sampling instant
It is: according to formulaObtain the reception signal in ith sample moment, wherein
L is the data length of described signal, siThe discrete signal sent for i-th transmitting terminal, and1≤i≤
LN+N-1, N are channel number, hjFor the channel parameter of jth channel, niThe gaussian signal arrived for ith sample instance sample；
Each described sampling instant is decoded, obtains the road that in each described sampling instant, minimum Eustachian distance is corresponding
Footpath, the path corresponding according to minimum euclidean distance in described each sampling instant and state, obtain the described of every path channels transmission
Signal, wherein said decodes sampling instant, and the path obtaining minimum Eustachian distance in sampling instant corresponding includes:
Generate the decoding matrix in ith sample moment
Decoding matrix based on the described ith sample moment obtains grid chart, and calculates each state of arrival based on described grid chart
The Euclidean distance in path, extracts, from the Euclidean distance in the path of each state of described arrival, the road that minimum euclidean distance is corresponding
Footpath.
Preferably, the described signal transmitting every path channels carries out high sampling, obtains different sampling instant each described
The sampled signal that signal is corresponding, including: at interval of the T/N moment, the signal transmitted every path channels respectively is once sampled,
To the described sampled signal that each signal is corresponding, wherein T is the transmission cycle of described first transmitting terminal sending the first signal.
The third aspect, the present invention provides a kind of signal processing apparatus, is applied to indoor visible light communication multi-user's multi input
In single output MU-MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal,
Wherein, each light fixture can send letter as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Number, described device includes:
First determines unit, can be as the lamp of transmitting terminal in described indoor visible light communication MU-MISO system for determining
Has and determines the quantity of described transmitting terminal；
Second determines unit, for the quantity according to described transmitting terminal, determines the launch time of each described transmitting terminal, its
Described in launch time for indicating time of corresponding described transmitting terminal proceed-to-send signal, the institute of each described transmitting terminal
State launch time different, and the signal that sends of signal and the reference emission end that in all transmitting terminals, other transmitting terminals send it
Between to have lap, described reference emission end be a transmitting terminal in all transmitting terminals, other transmitting terminals are all transmitting terminals
In transmitting terminal in addition to described reference emission end；
Indicating member, for launch time based on each described transmitting terminal, indicates described transmitting terminal in corresponding institute
State proceed-to-send signal launch time.
Preferably, described second determines that unit includes:
Determine subelement, for determine in whole described transmitting terminals first send signal described transmitting terminal and
Determine the transmission cycle of described first described transmitting terminal sending signal；
First obtains subelement, is used for the quantity according to described transmitting terminal and the transmission cycle of described transmitting terminal, obtains it
The transmitting time delay of the most described first the described transmitting terminal sending signal of his transmitting terminal, the transmitting of other transmitting terminals wherein said
Time delay is less than described transmission cycle, so that the described launch time of each described transmitting terminal is different, and other transmitting terminals are sent out
Lap is had between the signal of the signal sent and first described transmitting terminal transmission sending signal；
Second obtains subelement, for based on described first launch time of described transmitting terminal sending signal and other
The transmitting time delay of the most described first the described transmitting terminal sending signal of transmitting terminal, obtains the launch time of other transmitting terminals.
Preferably, described first obtains subelement, for according to formulaObtain other transmitting terminals the most described
One transmitting time delay coefficient of described transmitting terminal sending signal, and obtain other transmitting terminals the most described the according to formula ζ T
The transmitting time delay of one described transmitting terminal sending signal, wherein j is jth transmitting terminal, and N is the quantity of described transmitting terminal, and T is
The transmission cycle of described first described transmitting terminal sending signal.
Fourth aspect, the present invention provides a kind of signal processing apparatus, is applied to indoor visible light communication multi-user's multi input
In single output MU-MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal,
Wherein, each light fixture can send letter as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Number, described device includes:
Sampling unit, carries out high sampling for the signal transmitting every path channels, obtains the different each institute of sampling instant
Stating the sampled signal that signal is corresponding, wherein the signal of every path channels transmission is in described indoor visible light communication MU-MISO system
Corresponding transmitting terminal sends；
Acquiring unit, for obtaining the reception signal of each sampling instant, connecing of the most any one of sampling instant
The acquisition process of the collection of letters number is: according to formulaObtain the reception signal in ith sample moment, whereinL is the data length of described signal, siFor i-th transmitting terminal send discrete
Signal, and1≤i≤LN+N-1, N are channel number, hjFor the channel parameter of jth channel, niIt is
The gaussian signal that i sampling instant samples；
Decoding unit, for decoding each described sampling instant, obtains minimum Europe in each described sampling instant
The path that family name's distance is corresponding, the path corresponding according to minimum euclidean distance in described each sampling instant and state, obtain every road
The described signal of transmission, wherein said decodes sampling instant, obtains minimum Eustachian distance in sampling instant corresponding
Path include:
Generate the decoding matrix in ith sample moment
Decoding matrix based on the described ith sample moment obtains grid chart, and calculates each state of arrival based on described grid chart
The Euclidean distance in path, extracts, from the Euclidean distance in the path of each state of described arrival, the road that minimum euclidean distance is corresponding
Footpath.
Preferably, described sampling unit, at interval of the T/N moment, the signal transmitted every path channels respectively carries out one
Secondary sampling, obtains the described sampled signal that each signal is corresponding, and wherein T is described first transmitting terminal sending the first signal
Transmission cycle.
Compared with prior art, the technique scheme that the present invention provides has the advantage that
The technique scheme that the present invention provides can determine the launch time of transmitting terminal according to the quantity of transmitting terminal, its
Middle launch time for indicating time of corresponding transmitting terminal proceed-to-send signal, the launch time of each transmitting terminal each the most not phase
With, and have lap between signal and the signal of reference emission end transmission that in all transmitting terminals, other transmitting terminals send, when
When transmitting terminal uses this kind of mode to send signal, being positioned at the user terminal in indoor visible light communication MU-MISO system can know
Not going out signal is by which transmitting terminal to be sent so that transmitting terminal can not use channel coding technology to reduce doing between signal
Disturb.
And transmitting terminal use aforesaid way send signal time, each transmitting terminal can based on respective launch time to
User terminal sends signal so that user terminal is receiving multiple signal sometime, i.e. passes in upper signal channel sometime
Defeated multiple signal so that can transmit more data on finite bandwidth going up sometime, improves resource utilization.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
These accompanying drawings obtain other accompanying drawing.
Fig. 1 is the schematic diagram of the indoor visible light communication MU-MISO system that the embodiment of the present invention provides；
Fig. 2 is the flow chart of a kind of signal processing method that the embodiment of the present invention provides；
Fig. 3 is the schematic diagram of the signal transmission of multiple transmitting terminals that the embodiment of the present invention provides；
Fig. 4 is the flow chart of the another kind of signal processing method that the embodiment of the present invention provides；
Fig. 5 is the sampling schematic diagram that the embodiment of the present invention provides；
Fig. 6 is the schematic diagram of the reception signal acquisition that the embodiment of the present invention provides；
Fig. 7 is the structural representation of a kind of signal processing apparatus that the embodiment of the present invention provides；
Fig. 8 is the second structural representation determining unit in signal processing apparatus shown in Fig. 7；
Fig. 9 is the structural representation of the another kind of signal processing apparatus that the embodiment of the present invention provides.
Detailed description of the invention
Signal processing method and device that the embodiment of the present invention provides are applied to indoor visible light communication MU-shown in Fig. 1
In MISO system, wherein indoor visible light communication MU-MISO system includes multiple light fixture 11 and multiple user terminal 12, each lamp
Tool 11 can send signal as the transmitting terminal of indoor visible light communication MU-MISO system to user terminal 12, and user terminal 12 is then
Can use existing decoding technique that the signal received is decoded, needed for extracting self from the multiple signals received
Signal.
For make to be applied to the method and apparatus in the indoor visible light communication MU-MISO system shown in above-mentioned Fig. 1 purpose,
Technical scheme and advantage are clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technology in the embodiment of the present invention
Scheme is clearly and completely described, it is clear that described embodiment is a part of embodiment of the present invention rather than whole
Embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of protection of the invention.
Refer to Fig. 2, it illustrates a kind of flow chart of the signal processing method that the embodiment of the present invention provides, can include
Following steps:
201: determining in indoor visible light communication MU-MISO system can be as the light fixture of transmitting terminal and determine transmitting terminal
Quantity.Wherein include multiple light fixture in indoor visible light communication MU-MISO system, but owing to needing the number of signals of transmission
Restriction, need from these multiple light fixtures selected part be used as send signal transmitting terminal.If desired the number of signals transmitted
Consistent with the quantity of light fixture, the most directly choose whole light fixture and be used as sending the transmitting terminal of signal.
202: according to the quantity of transmitting terminal, determine the launch time of each transmitting terminal, be wherein used for launch time indicating phase
The time of corresponding transmitting terminal proceed-to-send signal, the launch time of each transmitting terminal is different, and in all transmitting terminals its
Lap is had between signal and the signal of reference emission end transmission that his transmitting terminal sends.
The most in embodiments of the present invention, all transmitting terminals choose a transmitting terminal as reference emission end,
Transmitting terminal in addition to reference emission end is other transmitting terminals, when determining the transmitting of reference emission end and other each transmitting terminals
During between, need launch time and meet 2 requirements: one is difference launch time of each transmitting terminal；Two be intended to so that
Lap is had, i.e. in first transmission cycle of the signal that reference emission end sends and between the signal that sends of other transmitting terminals
The letter that first transmission cycle of the signal that other transmitting terminals start transmission in corresponding launch time sends with reference emission end
Number first transmission cycle between have lap.
Such as indoor visible light communication MU-MISO system includes: transmitting terminal 1, transmitting terminal 2 and transmitting terminal 3, wherein transmitting terminal
Transmitting terminal on the basis of 1, the launch time of transmitting terminal 1 be time 1, the launch time of transmitting terminal 2 be time 2, the transmitting of transmitting terminal 3
Time is the time 3, and the time 2 is between time 1 and time 3, and the time 1 is early than time 3, the letter that these three transmitting terminal is sent
Relation between number is as shown in Figure 3, it can be seen that these three transmitting terminal is in addition to launch time difference, and it sends the of signal
Have lap between one transmission cycle, the signal that especially transmitting terminal 2 and transmitting terminal 3 send respectively with reference emission end
The signal of (transmitting terminal 1) has lap.
The most so arrange and be because launch time: when using send signal this kind of launch time between transmitting terminal,
Be positioned at the user terminal in indoor visible light communication MU-MISO system can identify signal is by which transmitting terminal to be sent, and makes
Obtaining transmitting terminal can not use channel coding technology to the interference reducing between signal.And this kind arranges the mode of launch time
So that the signal transmission form of channel is non-orthogonal (i.e. signal has overlap on the transmission time), when channel uses anon-normal
During the signal transmission form transmission signal handed over, the modulation system of transmitting terminal can be not limited to single OOK (on-off keying, On-
Off Keying) modulation system, other modulation systems being applicable to non-orthogonal signal transmission form may be applicable to the present invention
In the signal processing method that embodiment provides.
203: launch time based on each transmitting terminal, instruction transmitting terminal started to send letter in corresponding launch time
Number.As described in Figure 3 for three transmitting terminals, at proceed-to-send signal each self-corresponding launch time, wherein three transmitting terminals are sent out
The form of the number of delivering letters is not any limitation as, and it can be a signal with certain transmission cycle.
Knowable to technique scheme, the signal processing method that the embodiment of the present invention provides can be according to the number of transmitting terminal
Amount, determines the launch time of transmitting terminal, and wherein launch time is for indicating the time of corresponding transmitting terminal proceed-to-send signal,
The launch time of each transmitting terminal is different, and the signal that in all transmitting terminals, other transmitting terminals send is sent out with reference emission end
There is lap between the signal sent, when transmitting terminal uses this kind of mode to send signal, be positioned at indoor visible light communication MU-
It is by which transmitting terminal to be sent that user terminal in MISO system can identify signal so that transmitting terminal can not use channel
Coding techniques reduces the interference between signal.
And transmitting terminal use aforesaid way send signal time, each transmitting terminal can based on respective launch time to
User terminal sends signal so that user terminal is receiving multiple signal sometime, i.e. passes in upper signal channel sometime
Defeated multiple signal so that can transmit more data on finite bandwidth going up sometime, improves resource utilization.
In embodiments of the present invention, can set at random in the case of meeting above-mentioned 2 requirements the launch time of transmitting terminal
Put, or in embodiments of the present invention be as the criterion the launch time of reference emission end the transmitting that other transmitting terminals are set time
Between.Such as transmitting terminal on the basis of first transmitting terminal sending signal, wherein first transmitting terminal sending signal can be with
Machine sets, naturally it is also possible to determine according to the geographical position of each transmitting terminal in indoor visible light communication MU-MISO system, will
Can first light fixture transmitting terminal as first transmission signal receiving signal by electric lines of force.
After determining first transmitting terminal sending signal, in addition it is also necessary to determine the transmission of first transmitting terminal sending signal
In the cycle, according to quantity and the transmission cycle of transmitting terminal of transmitting terminal, obtain other transmitting terminals and send sending out of signal relative to first
Penetrate the transmitting time delay of end, and then can launch time based on first described transmitting terminal sending signal and other transmitting terminal phases
Transmitting time delay to the described transmitting terminal that first sends signal, obtains the launch time of other transmitting terminals, and wherein other are launched
The transmitting time delay of end sends the transmission cycle of the transmitting terminal of signal less than first, so that the launch time of each transmitting terminal is each not
Identical, and have overlapping portion between the signal of the signal of other transmitting terminals transmission and first described transmitting terminal transmission sending signal
Point.The process obtaining the transmitting time delay of other transmitting terminals and the launch time of other transmitting terminals is as follows:
According to formulaObtain the transmitting time delay system that other transmitting terminals send the transmitting terminal of signal relative to first
Number, wherein j is jth transmitting terminal, and N is the quantity of transmitting terminal；
The transmitting time delay of the most described first transmitting terminal sending signal of other transmitting terminals is obtained according to formula ζ T, its
Middle T is that the transmission cycle of described first described transmitting terminal sending signal, i.e. other transmitting terminals send signal relative to first
The transmitting time delay of transmitting terminal be ζ T, so other transmitting terminals send launch time of transmitting terminal of signal relative to first
For :+ζ T launch time of first transmitting terminal sending signal.
Corresponding with said method embodiment, the embodiment of the present invention also provides for another kind of information processing method, mainly illustrates
Receiving terminal i.e. user terminal processing procedure upon receipt of the signals, its flow chart as shown in Figure 4, may comprise steps of:
401: the signal transmitting every path channels carries out high sampling, obtain different sampling instant corresponding the adopting of each signal
Sample signal, wherein the signal of every path channels transmission is that in indoor visible light communication MU-MISO system, corresponding transmitting terminal sends, i.e. one
A transmitting terminal at least corresponding indoor visible light communication MU-MISO system of path channels, the signal that such transmitting terminal sends passes through
Transmission is to user terminal.
Can be at interval of the T/N moment when carrying out high sampling, the signal transmitted every path channels respectively is once adopted
Sample, obtains the sampled signal that each signal is corresponding, as shown in Figure 5, it is shown that the signal sending each transmitting terminal LEDi is not
Carry out the process sampled with sampling instant, wherein T is the transmission cycle of first transmitting terminal sending the first signal, and L is channel
The data length of the signal of transmission, N is channel number, and in the case of transmitting terminal with channel one_to_one corresponding, N is also transmitting terminal
Quantity.
402: obtain the reception signal of each sampling instant, the wherein acquisition receiving signal of any one sampling instant
Cheng Shi: according to formulaObtain the reception signal in ith sample moment, as shown in Figure 6, whereinL is the data length of signal, siThe discrete letter sent for i-th transmitting terminal
Number, and1≤i≤LN+N-1, N are channel number, hjFor the channel parameter of jth channel, niIt is i-th
The gaussian signal that individual sampling instant samples.
Here need Fig. 6 is illustrated, because sampling instant 1≤i≤LN+N-1, if in the square frame calculated
The subscript of s is less than 0, such as during n=1, n-N < 0, at this moment remembers sn-N=0, namely the value original state of the s in square frame is all
It is 0.Only when there being data siEntering after square frame, the total data of square frame start right shift, collect siWrite leftmost square frame
In, and when the result of calculation of the subscript of h is 0 in above-mentioned Fig. 6, remember h0For hN。
403: each sampling instant is decoded, obtain the path that in each sampling instant, minimum Eustachian distance is corresponding,
The path corresponding according to minimum euclidean distance in each sampling instant and state, obtain the signal of every path channels transmission.
Wherein decoding sampling instant, the path obtaining minimum Eustachian distance in sampling instant corresponding includes: generate
The decoding matrix in ith sample momentBased on described
The decoding matrix in ith sample moment obtains grid chart, and calculates the Europe in the path arriving each state based on described grid chart
Formula distance, extracts, from the Euclidean distance in the path arriving each state, the path that minimum euclidean distance is corresponding.
Above-mentioned steps 403 indicates the decoding process of the embodiment of the present invention, and this decoding process is similar to viterbi algorithm, with
Viterbi algorithm difference is: during decoding, needs, according to different sampling instant i, to generate sampling instant corresponding
Decoding matrix, and based on grid chart calculate Euclidean distance.
As in embodiments of the present invention, sampling instant is the natural number from 1 to LN+N-1, it is therefore desirable to from 1 to LN+N-1
Build the decoding matrix of each sampling instantWherein solve
Parameters in code matrix is at corresponding sampling instant channel parameter, and hM·N+jChannel parameter and hjChannel parameter phase
With, therefore can obtain N kind decoding matrix, 1≤M≤L from sampling instant 1 to LN+N-1.For during decoding, other are identical
Part, as obtained grid chart based on decoding matrix, extracts minimum European from the Euclidean distance in the path arriving each state
Distance and according to path corresponding to minimum euclidean distance in each sampling instant and state, obtains the signal of every path channels transmission
Process identical with existing viterbi algorithm, this embodiment of the present invention is no longer illustrated.
Knowable to technique scheme, the decoding process of the signal processing method docking collection of letters number that the embodiment of the present invention provides
It is similar to viterbi algorithm, and viterbi algorithm can be considered as Maximum likelihood sequence detection, and Maximum likelihood sequence detection is
Excellent decoded mode, therefore the embodiment of the present invention can be to receive the decoding algorithm that signal provides optimum, meet room lighting and
The fusion development of visible light communication.
For aforesaid each method embodiment, in order to be briefly described, therefore it is all expressed as a series of combination of actions, but
Being that those skilled in the art should know, the present invention is not limited by described sequence of movement, because according to the present invention, certain
A little steps can use other orders or carry out simultaneously.Secondly, those skilled in the art also should know, is retouched in description
The embodiment stated belongs to preferred embodiment, necessary to involved action and the module not necessarily present invention.
Corresponding with embodiment of the method shown in above-mentioned Fig. 2, the embodiment of the present invention also provides for a kind of signal processing apparatus, its knot
Structure schematic diagram is as it is shown in fig. 7, may include that and first determine unit 11, second determine unit 12 and indicating member 13.
First determines unit 11, can be as the light fixture of transmitting terminal in indoor visible light communication MU-MISO system for determining
And determine the quantity of transmitting terminal.Wherein include multiple light fixture in indoor visible light communication MU-MISO system, but owing to needing
The restriction of number of signals to be transmitted, needs selected part from these multiple light fixtures to be used as sending the transmitting terminal of signal.If needing
Number of signals to be transmitted is consistent with the quantity of light fixture, the most directly chooses whole light fixture and is used as sending the transmitting terminal of signal.
Second determines unit 12, for the quantity according to transmitting terminal, determines the launch time of each transmitting terminal, wherein launches
Time, the launch time of each transmitting terminal was different for indicating the time of corresponding transmitting terminal proceed-to-send signal, and
Lap, reference emission is had between signal and the signal of reference emission end transmission that in all transmitting terminals, other transmitting terminals send
End is a transmitting terminal in all transmitting terminals, and other transmitting terminals are the transmitting in all transmitting terminals in addition to reference emission end
End.
The most in embodiments of the present invention, all transmitting terminals choose a transmitting terminal as reference emission end,
Transmitting terminal in addition to reference emission end is other transmitting terminals, when determining the transmitting of reference emission end and other each transmitting terminals
During between, need launch time and meet 2 requirements: one is difference launch time of each transmitting terminal；Two be intended to so that
Lap is had, i.e. in first transmission cycle of the signal that reference emission end sends and between the signal that sends of other transmitting terminals
The letter that first transmission cycle of the signal that other transmitting terminals start transmission in corresponding launch time sends with reference emission end
Number first transmission cycle between have lap, as shown in Figure 3 above.
The most so arrange and be because launch time: when using send signal this kind of launch time between transmitting terminal,
Be positioned at the user terminal in indoor visible light communication MU-MISO system can identify signal is by which transmitting terminal to be sent, and makes
Obtaining transmitting terminal can not use channel coding technology to the interference reducing between signal.And this kind arranges the mode of launch time
So that the signal transmission form of channel is non-orthogonal (i.e. signal has overlap on the transmission time), when channel uses anon-normal
During the signal transmission form transmission signal handed over, the modulation system of transmitting terminal can be not limited to single OOK modulation system, other
The modulation system being applicable to non-orthogonal signal transmission form may be applicable to the signal processing method that the embodiment of the present invention provides
In.
Indicating member 13, for launch time based on each transmitting terminal, instruction transmitting terminal is in corresponding launch time
Proceed-to-send signal.For three transmitting terminals as described in above-mentioned Fig. 3, at proceed-to-send signal each self-corresponding launch time, its
In three transmitting terminals send the form of signals and be not any limitation as, it can be a signal with certain transmission cycle.
Knowable to technique scheme, the signal processing apparatus that the embodiment of the present invention provides can be according to the number of transmitting terminal
Amount, determines the launch time of transmitting terminal, and wherein launch time is for indicating the time of corresponding transmitting terminal proceed-to-send signal,
The launch time of each transmitting terminal is different, and the signal that in all transmitting terminals, other transmitting terminals send is sent out with reference emission end
There is lap between the signal sent, when transmitting terminal uses this kind of mode to send signal, be positioned at indoor visible light communication MU-
It is by which transmitting terminal to be sent that user terminal in MISO system can identify signal so that transmitting terminal can not use channel
Coding techniques reduces the interference between signal.
And transmitting terminal use aforesaid way send signal time, each transmitting terminal can based on respective launch time to
User terminal sends signal so that user terminal is receiving multiple signal sometime, i.e. passes in upper signal channel sometime
Defeated multiple signal so that can transmit more data on finite bandwidth going up sometime, improves resource utilization.
In embodiments of the present invention, can set at random in the case of meeting above-mentioned 2 requirements the launch time of transmitting terminal
Put, or in embodiments of the present invention be as the criterion the launch time of reference emission end the transmitting that other transmitting terminals are set time
Between.Such as transmitting terminal on the basis of first transmitting terminal sending signal, wherein first transmitting terminal sending signal can be with
Machine sets, naturally it is also possible to determine according to the geographical position of each transmitting terminal in indoor visible light communication MU-MISO system, will
Can first light fixture transmitting terminal as first transmission signal receiving signal by electric lines of force.
In embodiments of the present invention, it is set to be as the criterion the launch time of reference emission end the launch time of other transmitting terminals
In the case of, second determines the structural representation of unit 12 as shown in Figure 8, may include that and determines that subelement 121, first obtains
Subelement 122 and second obtains subelement 123.
Determine subelement 121, for determining first transmitting terminal sending signal in whole transmitting terminals and determining
The transmission cycle of first transmitting terminal sending signal.
First obtains subelement 122, for quantity and the transmission cycle of transmitting terminal of foundation transmitting terminal, obtains other and launches
Holding the transmitting time delay of relative first transmitting terminal sending signal, wherein the transmitting time delay of other transmitting terminals is less than transmission cycle,
So that the launch time of each transmitting terminal is different, and other transmitting terminals send signal with first transmission signal transmitting
Lap is had between the signal that end sends.
Concrete, first obtains subelement 122 according to formulaObtain other transmitting terminals and send letter relative to first
Number the transmitting time delay coefficient of transmitting terminal, and obtain other transmitting terminals according to formula ζ T and send the transmitting of signal relative to first
The transmitting time delay of end, wherein j is jth transmitting terminal, and N is the quantity of transmitting terminal, and T is the biography of first transmitting terminal sending signal
The defeated cycle.
Second obtains subelement 123, for sending launch time and other transmittings of the transmitting terminal of signal based on first
Hold the transmitting time delay of relative first transmitting terminal sending signal, obtain the launch time of other transmitting terminals.
Corresponding with embodiment of the method shown in above-mentioned Fig. 4, the embodiment of the present invention also provides for another kind of signal processing apparatus, its
Structural representation is as it is shown in figure 9, may include that sampling unit 21, acquiring unit 22 and decoding unit 23.
Sampling unit 21, carries out high sampling for the signal transmitting every path channels, obtains different sampling instant each
The sampled signal that signal is corresponding, wherein the signal of every path channels transmission is corresponding in indoor visible light communication MU-MISO system sending out
Penetrating end to send, a transmitting terminal at least corresponding indoor visible light communication MU-MISO system of i.e. one path channels, such transmitting terminal is sent out
The signal sent passes through transmission to user terminal.
Can be at interval of the T/N moment when carrying out high sampling, the signal transmitted every path channels respectively is once adopted
Sample, obtains the sampled signal that each signal is corresponding.
Acquiring unit 22, for obtaining the reception signal of each sampling instant, the wherein reception of any one sampling instant
The acquisition process of signal is: according to formulaObtain the reception signal in ith sample moment, whereinL is the data length of signal, siThe discrete letter sent for i-th transmitting terminal
Number, and1≤i≤LN+N-1, N are channel number, hjFor the channel parameter of jth channel, niIt is i-th
The gaussian signal that individual sampling instant samples.
Decoding unit 23, for decoding each sampling instant, obtains minimum Eustachian distance in each sampling instant
Corresponding path, the path corresponding according to minimum euclidean distance in each sampling instant and state, obtain the transmission of every path channels
Signal, wherein decodes sampling instant, and the path obtaining minimum Eustachian distance in sampling instant corresponding includes:
Generate the decoding matrix in ith sample moment
Decoding matrix based on the ith sample moment obtains grid chart, and calculates the Europe in the path arriving each state based on grid chart
Formula distance, extracts, from the Euclidean distance in the path arriving each state, the path that minimum euclidean distance is corresponding.
Above-mentioned decoding unit 23 indicates the decoding process of the embodiment of the present invention, and this decoding process is similar to Viterbi and calculates
Method, is with viterbi algorithm difference: during decoding, needs, according to different sampling instant i, to generate sampling instant
Corresponding decoding matrix, and calculate Euclidean distance based on grid chart.
As in embodiments of the present invention, sampling instant is the natural number from 1 to LN+N-1, it is therefore desirable to from 1 to LN+N-1
Build the decoding matrix of each sampling instantWherein solve
Parameters in code matrix is at corresponding sampling instant channel parameter, and hM·N+jChannel parameter and hjChannel parameter phase
With, therefore can obtain N kind decoding matrix, 1≤M≤L from sampling instant 1 to LN+N-1.For during decoding, other are identical
Part, as obtained grid chart based on decoding matrix, extracts minimum European from the Euclidean distance in the path arriving each state
Distance and according to path corresponding to minimum euclidean distance in each sampling instant and state, obtains the signal of every path channels transmission
Process identical with existing viterbi algorithm, this embodiment of the present invention is no longer illustrated.
Knowable to technique scheme, the decoding process of the signal processing apparatus docking collection of letters number that the embodiment of the present invention provides
It is similar to viterbi algorithm, and viterbi algorithm can be considered as Maximum likelihood sequence detection, and Maximum likelihood sequence detection is
Excellent decoded mode, therefore the embodiment of the present invention can be to receive the decoding algorithm that signal provides optimum, meet room lighting and
The fusion development of visible light communication.
It should be noted that in this article, the relational terms of such as first and second or the like is used merely to a reality
Body or operation separate with another entity or operating space, and deposit between not necessarily requiring or imply these entities or operating
Relation or order in any this reality.And, term " includes ", " comprising " or its any other variant are intended to
Comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that those are wanted
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that
Including process, method, article or the equipment of described key element there is also other identical element.
Described above to the disclosed embodiments, makes those skilled in the art be capable of or uses the present invention.To this
The multiple amendment of a little embodiments will be apparent from for a person skilled in the art, and generic principles defined herein can
With without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with principles disclosed herein and features of novelty the widest
Scope.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a signal processing method, it is characterised in that be applied to indoor visible light communication multi-user multiple input single output MU-
In MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal, wherein, each
Light fixture can send signal, described side as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Method includes:
Determining in described indoor visible light communication MU-MISO system can be as the light fixture of transmitting terminal and determine described transmitting terminal
Quantity；
According to the quantity of described transmitting terminal, determine the launch time of each described transmitting terminal, be used for referring to wherein said launch time
Showing the time of corresponding described transmitting terminal proceed-to-send signal, the described launch time of each described transmitting terminal is different,
And have lap, described base between the signal that sends of signal that in all transmitting terminals, other transmitting terminals send and reference emission end
Quasi-transmitting terminal is a transmitting terminal in all transmitting terminals, other transmitting terminals be in all transmitting terminals except described reference emission end it
Outer transmitting terminal；
Launch time based on each described transmitting terminal, described transmitting terminal is indicated to start to send in corresponding described launch time
Signal.
Method the most according to claim 1, it is characterised in that according to the quantity of described transmitting terminal, determines each described
Penetrate the launch time of end, including:
In whole described transmitting terminals, determine first described transmitting terminal sending signal and determine described first transmission
The transmission cycle of the described transmitting terminal of signal；
According to quantity and the transmission cycle of described transmitting terminal of described transmitting terminal, obtain the most described first of other transmitting terminals and send out
The transmitting time delay of the described transmitting terminal of the number of delivering letters, the transmitting time delay of other transmitting terminals wherein said is less than described transmission cycle, with
The described launch time making each described transmitting terminal is different, and other transmitting terminals send signal with first transmission signal
Described transmitting terminal send signal between have lap；
Relative with other transmitting terminals described first of launch time based on described first described transmitting terminal sending signal is sent out
The transmitting time delay of the described transmitting terminal of the number of delivering letters, obtains the launch time of other transmitting terminals.
Method the most according to claim 2, it is characterised in that the described quantity according to described transmitting terminal and described transmitting terminal
Transmission cycle, obtain the most described first the transmitting time delay of described transmitting terminal sending signal of other transmitting terminals, including:
According to formulaObtain the transmitting time delay of the most described first the described transmitting terminal sending signal of other transmitting terminals
Coefficient, wherein j is jth transmitting terminal, and N is the quantity of described transmitting terminal；
The transmitting time delay of the most described first the described transmitting terminal sending signal of other transmitting terminals is obtained according to formula ζ T, its
Middle T is the transmission cycle of described first described transmitting terminal sending signal.
4. a signal processing method, it is characterised in that be applied to indoor visible light communication multi-user multiple input single output MU-
In MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal, wherein, each
Light fixture can send signal, described side as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Method includes:
The signal transmitting every path channels carries out high sampling, obtains the sampling letter that the different each described signal of sampling instant is corresponding
Number, wherein the signal of every path channels transmission is that in described indoor visible light communication MU-MISO system, corresponding transmitting terminal sends；
Obtaining the reception signal of each sampling instant, the acquisition process receiving signal of the most any one of sampling instant is: depend on
According to formulaObtain the reception signal in ith sample moment, wherein
L is the data length of described signal, and si is the discrete signal that i-th transmitting terminal sends, and1≤i≤
LN+N-1, N are channel number, hjFor the channel parameter of jth channel, niThe gaussian signal arrived for ith sample instance sample；
Each described sampling instant is decoded, obtains the path that in each described sampling instant, minimum Eustachian distance is corresponding,
The path corresponding according to minimum euclidean distance in described each sampling instant and state, obtain the described letter of every path channels transmission
Number, wherein said sampling instant being decoded, the path obtaining minimum Eustachian distance in sampling instant corresponding includes:
Generate the decoding matrix in ith sample moment
Decoding matrix based on the described ith sample moment obtains grid chart, and calculates each state of arrival based on described grid chart
The Euclidean distance in path, extracts, from the Euclidean distance in the path of each state of described arrival, the road that minimum euclidean distance is corresponding
Footpath.
Method the most according to claim 4, it is characterised in that the described signal transmitting every path channels carries out high power and adopts
Sample, obtains the sampled signal that the different each described signal of sampling instant is corresponding, including: at interval of the T/N moment, respectively every road is believed
The signal of road transmission is once sampled, and obtains the described sampled signal that each signal is corresponding, and wherein T is described first transmission
The transmission cycle of the transmitting terminal of the first signal.
6. a signal processing apparatus, it is characterised in that be applied to indoor visible light communication multi-user multiple input single output MU-
In MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal, wherein, each
Light fixture can send signal, described dress as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Put and include:
First determines unit, for determine in described indoor visible light communication MU-MISO system can as the light fixture of transmitting terminal with
And determine the quantity of described transmitting terminal；
Second determines unit, for the quantity according to described transmitting terminal, determines the launch time of each described transmitting terminal, Qi Zhongsuo
State launch time for indicating the time of corresponding described transmitting terminal proceed-to-send signal, described of each described transmitting terminal
Time of penetrating is different, and has between signal and the signal of reference emission end transmission that in all transmitting terminals, other transmitting terminals send
Lap, described reference emission end is a transmitting terminal in all transmitting terminals, and other transmitting terminals are to remove in all transmitting terminals
Transmitting terminal outside described reference emission end；
Indicating member, for launch time based on each described transmitting terminal, indicates described transmitting terminal to send out described in corresponding
Penetrate time proceed-to-send signal.
Device the most according to claim 6, it is characterised in that described second determines that unit includes:
Determine subelement, for determining first described transmitting terminal sending signal in whole described transmitting terminals and determining
The transmission cycle of described first described transmitting terminal sending signal；
First obtains subelement, is used for the quantity according to described transmitting terminal and the transmission cycle of described transmitting terminal, obtains other
Penetrate the transmitting time delay of the most described first the described transmitting terminal sending signal of end, the transmitting time delay of other transmitting terminals wherein said
Less than described transmission cycle, so that the described launch time of each described transmitting terminal is different, and the transmission of other transmitting terminals
Lap is had between the signal of signal and first described transmitting terminal transmission sending signal；
Second obtains subelement, for launch time based on described first described transmitting terminal sending signal and other transmittings
Hold the transmitting time delay of the most described first described transmitting terminal sending signal, obtain the launch time of other transmitting terminals.
Device the most according to claim 7, it is characterised in that described first obtains subelement, for according to formulaObtain the transmitting time delay coefficient of the most described first the described transmitting terminal sending signal of other transmitting terminals, and foundation
Formula ζ T obtains the transmitting time delay of the most described first the described transmitting terminal sending signal of other transmitting terminals, and wherein j is jth
Individual transmitting terminal, N is the quantity of described transmitting terminal, and T is the transmission cycle of described first described transmitting terminal sending signal.
9. a signal processing apparatus, it is characterised in that be applied to indoor visible light communication multi-user multiple input single output MU-
In MISO system, described indoor visible light communication MU-MISO system includes multiple light fixture and multiple user terminal, wherein, each
Light fixture can send signal, described dress as the transmitting terminal of described indoor visible light communication MU-MISO system to described user terminal
Put and include:
Sampling unit, carries out high sampling for the signal transmitting every path channels, obtains the different each described letter of sampling instant
Number corresponding sampled signal, wherein the signal of every path channels transmission is corresponding in described indoor visible light communication MU-MISO system
Transmitting terminal sends；
Acquiring unit, for obtaining the reception signal of each sampling instant, the reception letter of the most any one of sampling instant
Number acquisition process be: according to formulaObtain the reception signal in ith sample moment, whereinL is the data length of described signal, and si is the discrete of i-th transmitting terminal transmission
Signal, and1≤i≤LN+N-1, N are channel number, hjFor the channel parameter of jth channel, niIt is
The gaussian signal that i sampling instant samples；
Decoding unit, for each described sampling instant is decoded, obtain in each described sampling instant minimum Euclidean away from
From corresponding path, the path corresponding according to minimum euclidean distance in described each sampling instant and state, obtain every path channels
The described signal of transmission, wherein said decodes sampling instant, obtains the road that minimum Eustachian distance in sampling instant is corresponding
Footpath includes:
Generate the decoding matrix in ith sample moment
Decoding matrix based on the described ith sample moment obtains grid chart, and calculates each state of arrival based on described grid chart
The Euclidean distance in path, extracts, from the Euclidean distance in the path of each state of described arrival, the road that minimum euclidean distance is corresponding
Footpath.
Device the most according to claim 9, it is characterised in that described sampling unit, at interval of T/N moment, difference
The signal transmitting every path channels is once sampled, and obtains the described sampled signal that each signal is corresponding, and wherein T is described
The transmission cycle of one transmitting terminal sending the first signal.
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