CN105471505B - A kind of signal modulating method, device and visible light communication system - Google Patents

A kind of signal modulating method, device and visible light communication system Download PDF

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CN105471505B
CN105471505B CN201610049200.5A CN201610049200A CN105471505B CN 105471505 B CN105471505 B CN 105471505B CN 201610049200 A CN201610049200 A CN 201610049200A CN 105471505 B CN105471505 B CN 105471505B
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signal
constellation point
constellation
modulation
anscombe
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CN105471505A (en
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张剑
司马凌寒
朱义君
于宏毅
邬江兴
田忠骏
仵国锋
汪涛
王超
刘洛琨
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PLA Information Engineering University
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PLA Information Engineering University
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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
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • 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
    • H04B10/564—Power control

Abstract

The embodiment of the present application discloses a kind of signal modulating method, and this method includes：Obtain primary signal and order of modulation；According to the order of modulation, and constellation structure criterionEach constellation point is determined, the constellation structure criterion is to be obtained according to Anscombe shift theories, and i is i-th of constellation point；Transmission power corresponding to the signal code of primary signal corresponding to each constellation point is determined respectively；According to the transmission power, each symbol for modulating the primary signal is optical signal.In this method, each constellation point is determined according to new constellation structure criterion, and then obtain transmission power corresponding to each symbol.Constellation structure criterion obtains according to Anscombe shift theories, because the noise in Poisson channel can be converted to constant term by Anscombe conversion, it is unrelated with signal to be enable to noise, reduce influence of the noise to signal, the accuracy of constellation point thus is improved, and then improves the performance of system.

Description

A kind of signal modulating method, device and visible light communication system
Technical field
The application is related to technical field of visible light communication, more particularly to a kind of signal modulating method, device and visible ray lead to Letter system.
Background technology
A kind of emerging mode as radio communication, it is seen that optic communication (VLC) is because of its green frequency spectrum resource, controllable logical Letter scope, transmission speed of high speed etc. develop rapidly.
Visible light communication system includes optical signal launch part and optical signal receiving portion, wherein, optical signal launch part Electric signal is modulated rear carrier frequency to light emitting diode (Light-Emitting Diode, LED) light fixture, passes through LED Have the visible ray sent and carry out signal transmission, in signal receiving end, be converted to the optical signal received using photon detector Electric signal.In order to improve the sensitivity of photon detector, at present using single-photon avalanche diode (Single Photon Avalanche Diode, SPAD) be used as reception means, with general PD using Direct-detection Optical it is strong by the way of compared with, SPAD works Work recorded the number of photons up to receiving terminal under Geiger mode angular position digitizer by avalanche effect, then be eventually converted into electric signal.Because utilize Response mechanism of the avalanche effect as optical signal, possesses high sensitivity by this way.Again because object of observation changes It is changed into photon, so that the electric signal eventually detected introduces the randomness of particle so that transmission channel changes into Poisson Channel.
But because Poisson channel is signal relationship type channel, when transmission signal power is bigger, channel quality is poorer, is System performance is also affected.Therefore, a kind of signal modulating method that can adapt to Poisson channel is needed badly, it is poor to solve systematic function The problem of.
The content of the invention
In view of this, it is existing to solve this application provides a kind of signal modulating method, device and visible light communication system The problem of systematic function difference in technology.
To achieve the above object, the application provides following technical scheme：
A kind of signal modulating method, applied to the transmitter of visible light communication system, the visible light communication system connects Receiving device includes：SPAD arrays, this method include：
Obtain primary signal and order of modulation；
According to the order of modulation, and constellation structure criterionDetermine each constellation point, the constellation It is to be obtained according to Anscombe shift theories to build criterion, and i is i-th of constellation point；
Transmission power corresponding to the signal code of primary signal corresponding to each constellation point is determined respectively；
According to the transmission power, each symbol for modulating the primary signal is optical signal.
Preferably, the constellation structure criterion obtains according to following steps：
Determine the kth in the first signal z (k)=α x (k)+n (k), wherein z (k) the first signal of expression that receiver receives Individual symbol, x (k) are transmission signal, and n (k) is poisson noise, and a is constant；
By first signal according to formulaAnscombe conversion is carried out, wherein, v represents loading It is constant in the DC offset voltage of the photon detector output end, z'(k) represent to k-th of symbol in the first signal Carry out the result after Anscombe conversion；
Obtain the secondary signal obtained after the fortran, the secondary signal Gaussian distributed；
Each constellation point corresponding to the secondary signal is solved according to default constraintsIt is described about Beam condition is the minimum condition of the average light power of each constellation point.
Preferably, the constraints is：
Two different constellation points in constellationMinimum normalized cumulant between opening after radical sign is 1, i.e.,
A kind of modulating apparatus, applied to the transmitter of visible light communication system, the device includes：
Signal acquisition module, for obtaining primary signal and order of modulation；
Constellation point determining module, for according to the order of modulation, and constellation structure criterionIt is determined that Each constellation point；
Transmission power determining module, for determining respectively corresponding to the signal code of primary signal corresponding to each constellation point Transmission power；
Modulation module, for according to the transmission power, each symbol for modulating the primary signal to be optical signal.
Preferably, in addition to：Criterion determining module, including：
First signal determining unit, the first signal z (k)=α x (the k)+n (k), wherein z received for determining receiver (k) k-th of symbol in the first signal is represented, x (k) is transmission signal, and n (k) is poisson noise, and a is constant；
Converter unit, for by first signal according to formulaAnscombe conversion is carried out, Wherein, v represents to be carried in the DC offset voltage of the photon detector output end, be constant, z'(k) represent to the first letter K-th of symbol in number carries out the result after Anscombe conversion；
Secondary signal obtaining unit, for obtaining the secondary signal obtained after the fortran, the secondary signal Gaussian distributed；
Constellation point solves unit, for solving each constellation point corresponding to the secondary signal according to default constraintsThe constraints is the minimum condition of the average light power of each constellation point, and i is i-th of constellation Point.
Preferably, including：Transmitter, LED luminescence chips and receiver, wherein, the receiver includes：SPAD arrays；
The transmitter is used for：Primary signal and order of modulation are obtained, according to the order of modulation, and constellation structure criterionEach constellation point is determined, determines that the signal code of primary signal corresponding to each constellation point is corresponding respectively Transmission power, according to the transmission power, each symbol for modulating the primary signal is optical signal；
The LED luminescence chips are used to give the optical signal transmission to the receiver；
The receiver is used for, and receives the optical signal, and is demodulated, and obtains the primary signal.
Preferably, the transmitter includes：FPGA.
Understood via above-mentioned technical scheme, in signal modulating method disclosed in the embodiment of the present application, according to new constellation Structure criterion determines each constellation point, and then obtains transmission power corresponding to each symbol.Constellation builds criterion foundation Anscombe shift theories and obtain, due to Anscombe conversion the noise in Poisson channel can be converted to constant term, from And make it possible to that noise is unrelated with signal, influence of the noise to signal is reduced, thus the accuracy of constellation point is improved, and then Improve the performance of system.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this The embodiment of application, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of flow chart of signal modulating method disclosed in the embodiment of the present application；
Fig. 2 is the flow chart of another signal modulating method disclosed in the embodiment of the present application；
Fig. 3 is a kind of structural representation of modulating apparatus disclosed in the embodiment of the present application；
Fig. 4 is the structural representation of another modulating apparatus disclosed in the embodiment of the present application；
Fig. 5 is a kind of structural representation of visible light communication system disclosed in the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete Site preparation describes, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on Embodiment in the application, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of the application protection.
A kind of flow of signal modulating method disclosed in the embodiment of the present application is as shown in figure 1, be applied to visible light communication system The transmitter of system, the receiver of the visible light communication system include：SPAD arrays.SPAD is using the hand for detecting photon number Section, signal acquisition is carried out, in view of single SPAD can only once capture a photon, therefore using SPAD arrays as receiver To improve detectability.This method includes：
Step S101：Obtain primary signal and order of modulation；
Order of modulation is K.When order of modulation is 2, two states can be flickered to represent 0,1 two letters using LED Number.And when order of modulation for integer more than 2 when, then need utilize different bright intensity, i.e. power level represents difference Symbol.
Step S102：According to the order of modulation, and constellation structure criterionDetermine each constellation Point, the constellation structure criterion is to be obtained according to Anscombe shift theories；
Constellation building process disclosed in the embodiment of the present application as shown in Fig. 2 including：
Step S201：Determine that the first signal z (k)=α x (k)+n (k), wherein z (k) that receiver receives represents the first letter K-th of symbol in number, x (k) are transmission signal, and n (k) is poisson noise, and a is constant；
Step S202：By first signal according to formulaAnscombe conversion is carried out, wherein, V represents to be carried in the DC offset voltage of the photon detector output end, be constant, z'(k) expression is in the first signal K-th of symbol carries out the result after Anscombe conversion；
Now z ' (k) structure is changed into the form that signal adds white Gaussian noise.So height can be regarded in transform-domain signals This signal transacting.
Step S203：Obtain the secondary signal obtained after the fortran, the secondary signal Gaussian distributed；
Step S204：Each constellation point corresponding to the secondary signal is solved according to default constraintsThe constraints is the minimum condition of the average light power of each constellation point, and i is i constellation point.
Signal after conversion is handled still according to gaussian signal.
The constraints is：
Two different constellation points in constellationMinimum normalized cumulant between opening after radical sign is 1, i.e.,
During constellation is built, the reception signal for obeying Poisson distribution is carried out Anscombe by the embodiment of the present application After conversion, Anscombe conversion is effective just for Poisson distribution, and form isContain pool by the conversion The signal of loose noise, the form that signal adds Gaussian noise can be changed into, by this conversion, by Poisson originally relevant with signal Noise is converted into the Gaussian noise unrelated with signal.
There is mathematic(al) law to understand z ' distribution with stable variance after conversion.Original constellation building process is, it is known that Signal z and solve signal constellation point, the constellation point i.e. z expectation.And after the conversion, reform into solution z ' star Seat point.
The constellation building process occurs before signal modulation.
Step S103：Transmission power corresponding to the signal code of primary signal corresponding to each constellation point is determined respectively；
Step S104：According to the transmission power, each symbol for modulating the primary signal is optical signal.
In signal modulating method disclosed in the embodiment of the present application, each constellation point is determined according to new constellation structure criterion, And then transmission power corresponding to obtaining each symbol, then signal is modulated again, ensures that the signal after modulation can be more preferable Transmission in the channel, the performance of lifting system.Constellation structure criterion obtains according to Anscombe shift theories, due to Noise in Poisson channel can be converted to constant term by Anscombe conversion, and it is unrelated with signal to be enable to noise, be dropped Low influence of the noise to signal, thus the accuracy of constellation point is improved, and then improve the performance of system.
The application also discloses a kind of modulating apparatus, and it is applied to the transmitter of visible light communication system, the dress The structure put as shown in figure 3, including：
Signal acquisition module 301, for obtaining primary signal and order of modulation；
Constellation point determining module 302, for according to the order of modulation, and constellation structure criterion Determine each constellation point；
Transmission power determining module 303, for determining the signal code pair of primary signal corresponding to each constellation point respectively The transmission power answered；
Modulation module 304, for according to the transmission power, each symbol for modulating the primary signal to be optical signal.
Further, it also includes：
Criterion determining module 305, its structure as shown in figure 4, including：
First signal determining unit 3051, the first signal z (k)=α x (the k)+n (k) received for determining receiver, its Middle z (k) represents k-th of symbol in the first signal, and x (k) is transmission signal, and n (k) is poisson noise, and a is constant；
Converter unit 3052, for by first signal according to formulaCarry out Anscombe Conversion, wherein, v represents to be carried in the DC offset voltage of the photon detector output end, be constant, z'(k) expression is to the K-th of symbol in one signal carries out the result after Anscombe conversion；
Secondary signal obtaining unit 3053, the secondary signal obtained for acquisition after the fortran, described second Signal Gaussian distributed；
Constellation point solves unit 3054, for solving each constellation corresponding to the secondary signal according to default constraints PointThe constraints is the minimum condition of the average light power of each constellation point, and i is i-th of constellation Point.
Modulating apparatus disclosed in the embodiment of the present application, each constellation point is determined according to new constellation structure criterion, is entered And transmission power corresponding to each symbol is obtained, then signal is modulated.Constellation structure criterion converts according to Anscombe Principle and obtain, due to Anscombe conversion the noise in Poisson channel can be converted to constant term, be enable to make an uproar Sound is unrelated with signal, reduces influence of the noise to signal, thus improves the accuracy of constellation point, and then improves system Performance.
The application also discloses a kind of VISIBLE LIGHT SYSTEM, its structure as shown in figure 5, including：Transmitter 501, LED hairs Optical chip 502 and receiver 503, wherein, the receiver includes：SPAD arrays 5031.
The transmitter 501 is used for：Primary signal and order of modulation are obtained, is built according to the order of modulation, and constellation CriterionEach constellation point is determined, determines the signal code of primary signal corresponding to each constellation point respectively Corresponding transmission power, according to the transmission power, each symbol for modulating the primary signal is optical signal；
The LED luminescence chips 502 are used to give the optical signal transmission to the receiver；
The receiver 503 is used for, and receives the optical signal, and is demodulated, and obtains the primary signal.
Constellation builds criterionDetermination process be：Determine the first signal z (k) that receiver receives =α x (k)+n (k), wherein z (k) represent k-th of symbol in the first signal, and x (k) is transmission signal, and n (k) is poisson noise, A is constant；By first signal according to formulaAnscombe conversion is carried out, wherein, v represents loading It is constant in the DC offset voltage of the photon detector output end, z'(k) represent to k-th of symbol in the first signal Carry out the result after Anscombe conversion；The secondary signal obtained after the fortran is obtained, the secondary signal is obeyed Gaussian Profile；Each constellation point corresponding to the secondary signal is solved according to default constraintsIt is described Constraints is the minimum condition of the average light power of each constellation point.
Receiver when carrying out signal demodulation, to signal enter by the constellation point that also utilize transmitter to be used when sending signal Row demodulation.
In the present embodiment, as shown in FIG., receiver removes the reception that signal is carried out comprising SPAD arrays, in addition to FPGA5032, signal is demodulated and handled, similarly, transmitter can also be realized modulation and the signal to signal by FPGA The process of reason.
In visible light communication system disclosed in the embodiment of the present application, transmitter is determined each using new constellation structure criterion Constellation point, and then obtain transmission power corresponding to each symbol.Constellation structure criterion obtains according to Anscombe shift theories , because the noise in Poisson channel can be converted to constant term by Anscombe conversion, it is enable to noise and signal It is unrelated, influence of the noise to signal is reduced, thus the accuracy of constellation point is improved, and then improve the performance of system.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight Point explanation is all difference with other embodiment, between each embodiment identical similar part mutually referring to. For device class embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is joined See the part explanation of embodiment of the method.
Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged Except other identical element in the process including the key element, method, article or equipment being also present.
The foregoing description of the disclosed embodiments, those skilled in the art are enable to realize or using the present invention.To this A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and generic principles defined herein can Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited The embodiments shown herein is formed on, and is to fit to consistent with principles disclosed herein and features of novelty most wide Scope.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (7)

  1. A kind of 1. signal modulating method, it is characterised in that applied to the transmitter of visible light communication system, the visible light communication The receiver of system includes：SPAD arrays, this method include：
    Obtain primary signal and order of modulation；
    According to the order of modulation, and constellation structure criterionDetermine each constellation point, the constellation structure Criterion is to be obtained according to Anscombe shift theories, and i is i-th of constellation point, and K is order of modulation；
    Transmission power corresponding to the signal code of primary signal corresponding to each constellation point is determined respectively；
    According to the transmission power, each symbol for modulating the primary signal is optical signal.
  2. 2. according to the method for claim 1, it is characterised in that the constellation structure criterion obtains according to following steps：
    Determine that the first signal z (k)=α x (k)+n (k), wherein z (k) that receiver receives represents to accord with for k-th in the first signal Number, x (k) is transmission signal, and n (k) is poisson noise, and a is constant；
    By first signal according to formulaAnscombe conversion is carried out, wherein, v represents to be carried in light The DC offset voltage of sub- detector output end, is constant, z'(k) represent to carry out k-th of symbol in the first signal Result after Anscombe conversion；
    Obtain the secondary signal obtained after the fortran, the secondary signal Gaussian distributed；
    Each constellation point corresponding to the secondary signal is solved according to default constraintsThe constraint bar Part is the minimum condition of the average light power of each constellation point.
  3. 3. according to the method for claim 2, it is characterised in that the constraints is：
    Two different constellation point s in constellation,Minimum normalized cumulant between opening after radical sign is 1, i.e.,
  4. 4. a kind of modulating apparatus, it is characterised in that applied to the transmitter of visible light communication system, the device includes：
    Signal acquisition module, for obtaining primary signal and order of modulation；
    Constellation point determining module, for according to the order of modulation, and constellation structure criterionDetermine each Constellation point, the constellation structure criterion is to be obtained according to Anscombe shift theories, and i is i-th of constellation point, and K is order of modulation；
    Transmission power determining module, for determining transmitting corresponding to the signal code of primary signal corresponding to each constellation point respectively Power；
    Modulation module, for according to the transmission power, each symbol for modulating the primary signal to be optical signal.
  5. 5. device according to claim 4, it is characterised in that also include：Criterion determining module, including：
    First signal determining unit, the first signal z (k)=α x (the k)+n (k), wherein z (k) tables received for determining receiver Show k-th of symbol in the first signal, x (k) is transmission signal, and n (k) is poisson noise, and a is constant；
    Converter unit, for by first signal according to formulaAnscombe conversion is carried out, wherein, v Represent to be carried in the DC offset voltage of photon detector output end, be constant, z'(k) expression is to k-th in the first signal Symbol carries out the result after Anscombe conversion；
    Secondary signal obtaining unit, for obtaining the secondary signal obtained after the fortran, the secondary signal is obeyed Gaussian Profile；
    Constellation point solves unit, for solving each constellation point corresponding to the secondary signal according to default constraintsThe constraints is the minimum condition of the average light power of each constellation point, and i is i-th of constellation point.
  6. A kind of 6. visible light communication system, it is characterised in that including：Transmitter, LED luminescence chips and receiver, wherein, it is described Receiver includes：SPAD arrays；
    The transmitter is used for：Primary signal and order of modulation are obtained, according to the order of modulation, and constellation structure criterionEach constellation point is determined, the constellation structure criterion is to be obtained according to Anscombe shift theories, and i is I-th of constellation point, K are order of modulation, determine to launch corresponding to the signal code of primary signal corresponding to each constellation point respectively Power, according to the transmission power, each symbol for modulating the primary signal is optical signal；
    The LED luminescence chips are used to give the optical signal transmission to the receiver；
    The receiver is used for, and receives the optical signal, and is demodulated, and obtains the primary signal.
  7. 7. system according to claim 6, it is characterised in that the transmitter includes：FPGA.
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CN106330312B (en) * 2016-08-31 2018-11-02 中国人民解放军信息工程大学 A kind of underwater visible light communication method, apparatus and system
CN107493133B (en) * 2017-05-16 2019-10-15 中国人民解放军信息工程大学 A kind of additivity uniquely can decompose the construction method and its system of constellation group
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