CN110061777A - A kind of relay cooperative indoor visible light communication method and system based on NOMA - Google Patents
A kind of relay cooperative indoor visible light communication method and system based on NOMA Download PDFInfo
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- CN110061777A CN110061777A CN201910315556.2A CN201910315556A CN110061777A CN 110061777 A CN110061777 A CN 110061777A CN 201910315556 A CN201910315556 A CN 201910315556A CN 110061777 A CN110061777 A CN 110061777A
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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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
Abstract
The relay cooperative indoor visible light communication method and system based on NOMA that the invention discloses a kind of, the method its include the following steps: through relay cooperative, in two independent time slots cooperation complete information source to destination node communication；In second time slot, the information from information source node and relaying itself is overlapped by relay node using NOMA technology on power domain, is respectively completed the communication for being relayed to two destination nodes.The present invention is using relaying and NOMA technology, so that the relaying in general visible cooperation communication system can complete the transmission of self information while completing the transmission of information source information.
Description
Technical field
The invention belongs to indoor visible light communication technical fields, and in particular to a kind of indoor visible light association based on NOMA
Make communication means and system.
Background technique
As a kind of emerging wireless communication technique, it is seen that optic communication (VLC, Visible Light
Communication) realized with it simple, low in cost, green safe characteristic has attracted the extensive of academia and industry
Concern.In recent years, with the raising of manufacturing process, light emitting diode (LED, Light Emitting Diode) etc. is at low cost
It is honest and clean, can scale of mass production light emitting component extensively instead of conventional illumination device.White light LEDs are not only able to realize indoor
Illumination, the dimming function having are even more that can send electric signal by the optical signal that light intensity changes.Photodiode
The optical signal that light intensity changes can be converted into corresponding electric signal by the use of sensor devices such as (PD, Photo Diode).Cause
This, can realize VLC under conditions of realizing room lighting function using optical components such as LED and PD.VLC is the following realization
In enclosed environment, one of the best techniques of short distance high-speed communication.
Simultaneously in a wireless communication system, relay cooperative communication technology is often applied to information source node to destination node
Distance farther out, channel condition too it is poor be not enough to support information to transmit in the case where, can be by information source node and destination node
Between set up the method for relay node, relay node is transmitted information to by information source node, relay node forwards the information to again
Destination node, so that the communication between information source node and destination node is able to complete under relatively good channel condition.Indoors
In visible light communication system, visible optical link between information source node and destination node may be hindered due to the presence of barrier
It is disconnected, lead to information Transmission, it is therefore desirable to introduce corresponding secondary light source as relaying to assist between information source and destination node
Communication.
In recent years, NOMA technology (i.e. non-orthogonal multiple access technology) is as a kind of new multiple access technique
The extensive concern of art circle.Due to NOMA take to be the mode of power domain superposition realize the synchronous transfer of multi-signal, it is different
It is transmitted between signal using the same frequency range.Assuming that the channel condition of different transmission path is it is known that NOMA foundation channel item
The quality of part carries out power distribution, the more power of the distribution of bad channel conditions.Different signals is directly superimposed to send out together
It goes, in signal receiving end, the size relation according to power determines demodulation sequence.High-power signal first demodulates, the small letter of power
Number noise is taken as to handle.After the signal for demodulating first part, subtracts to demodulate from the mixed signal received and
First part's signal, the signal of re-demodulation second part.
The application in visible light communication system indoors of relay cooperative technology so that indoor visible light communication coverage area
More extensively；And application of the NOMA technology in relay cooperative visible light communication system is so that the relay node in system not only can
Information source information is enough forwarded, while can also send relaying self information to corresponding destination node.In summary, it is necessary to research and develop
One kind can be by the effectively combined technology of above-mentioned technology, so that the relaying section in indoor visible light cooperation communication system
Point not only is used to forward the message of information source node, while can also send the message of oneself.
Summary of the invention
In view of drawback existing in the prior art, the present invention provides one kind to realize that much information forwards simultaneously based on NOMA
Relay cooperative indoor visible light communication method, the technical issues of effectively to solve mentioned in background technique.
A kind of relay cooperative indoor visible light communication method based on NOMA, which comprises the steps of:
S1, in visible light communication system, by relay cooperative, information source node is completed in cooperation in two independent time slots
To the communication of destination node, the visible light communication system includes at least two time slots, in first time slot, information source node pair
Information source information is handled, and is obtained the first visible light signal and is sent it to relay node, and relay node is obtained from information source
The visible light signal of node, and convert it into corresponding current signal；
S2, in second time slot so that relay node using NOMA technology will from information source node and relay node from
The information of body is overlapped on power domain, and is respectively completed the communication of relay node to two destination nodes.
Further, S1 includes the following steps:
S11, information source message is converted by real number time-domain signal by the information source node of visible light communication system；
S12, in the first time slot, carry out intensity modulated after the real number time-domain signal is converted into nonnegative real number signal,
The current signal changed comprising information amplitude is converted into the first visible light signal and is sent to relay node, described first is visible
Optical signal changes as light intensity signal amplitude changes；
S13, at the first time slot end, first visible light signal demodulation is reduced into the current signal of amplitude variation；
S14, the relay node signal to be transmitted obtained demodulated signal and relay node itself according to NOMA technology into
Row superposition.
Further, S2 includes the following steps:
S21, in the second time slot, the mixed signal is converted into time-domain signal and obtains non-negative real number signal；
S22, intensity modulated is carried out to the nonnegative real number signal, obtains the second visible light signal, respectively by different
Visible light channel is sent to different receiving nodes i.e. destination node.
After S23, two different receiving nodes receive second visible light signal, respectively by the second of light intensity variation
Visible light signal is converted into the current signal of amplitude variation.
S24, received current signal is demodulated in each receiving node, and combines carried out clipped noise point
Analysis calculates separately the signal-to-noise ratio and handling capacity of respective desired signal, and is analyzed.
The present invention also provides a kind of relay cooperative indoor visible light communication system based on NOMA, the visible light communication
System includes at least two time slots, an information source node, a relay node and two respectively with the information source node and in
After the corresponding destination node of node；It is characterized in that, the visible light communication system further include:
It is placed in the transmitting module of information source node, is used to for information source message to be converted into real number time-domain signal, and at first
In gap, intensity modulated is carried out after the real number time-domain signal is converted into nonnegative real number signal, by the current signal comprising information
It is converted into the first visible light signal and is sent to relay node, the light intensity of first visible light signal is with current signal amplitude
Change and changes；
The relay node is used to that first visible light signal demodulation to be reduced into amplitude and is become at the first time slot end
The current signal of change and be overlapped signal that the current signal and relay node to be transmitted itself according to NOMA is mixed
Close signal；The relay node is also used in the second time slot, and the mixed signal is converted into time-domain signal and is obtained non-negative
Real number signal carries out intensity modulated to the nonnegative real number signal, obtains the second visible light signal, respectively by different visible
Optical channel is sent to different receiving nodes i.e. destination node；
Each receiving node is used for after receiving second visible light signal, respectively by the of light intensity variation
Two visible light signals be converted into amplitude variation current signal and received current signal is demodulated, and combine institute into
Capable clipped noise is analyzed the signal-to-noise ratio for calculating separately out respective desired signal and is analyzed after handling capacity.
Compared with prior art, beneficial effects of the present invention:
The present invention makes can not communicate or communicating in indoor visible light communication system using relay cooperative communication technology
Communication can be realized between the information source node and destination node of poor effect well；And NOMA technology is utilized, so that in system
Relay node be not only able to forwarding information source information, while can also send self information to corresponding destination node；The present invention
Optimization problem is proposed for handling capacity simultaneously, a series of optimal system parameters have been obtained, so that the handling capacity of system significantly mentions
It is high.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments, and the invention is not limited solely to content involved in this example.
Fig. 1 is the corresponding flow diagram of the method for the invention；
Fig. 2 is the corresponding illustraton of model of method in the specific embodiment of the invention；
Fig. 3 and Fig. 4 is corresponding the present embodiment of method in the specific embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Based on above-mentioned design scheme, the present invention devises one kind and NOMA technology is utilized to realize relay node while forward
The technology of two kinds of information.It is by relay cooperative, and cooperation completes information source node to destination node in two independent time slots
Communication；In second time slot, relay node is using NOMA technology by the information from information source node and relaying itself in power
It is overlapped on domain, is respectively completed the communication for being relayed to two destination nodes；And by analyzing non-linear clipping procedure bring
Clipped noise, the signal-to-noise ratio of the signal received, the handling capacity of signal, the handling capacity for optimizing different time-gap obtain optimal direct current
The parameters such as biasing and power allocation factor.
Specifically, the relay cooperative indoor visible light communication method based on NOMA, which is characterized in that such as Fig. 1, specifically
Include:
S1, in visible light communication system, by relay cooperative, information source node is completed in cooperation in two independent time slots
To the communication of destination node, the visible light communication system includes at least two time slots, an information source node, a relay node
And two destination nodes corresponding with the information source node and relay node respectively；In first time slot, information source node pair
Information source information is handled, and is obtained the first visible light signal and is sent it to relay node, and relay node is obtained from information source
The visible light signal of node, and convert it into corresponding current signal；Further, S1 includes the following steps: S11, passes through
Information source message is converted into real number time-domain signal by the information source node of visible light communication system, specifically, the transmitting mould of information source node
Frequency-region signal is converted to time-domain signal by IFFT by block, and adds direct current biasing to the time-domain signal, while carrying out to it non-
Linear slicing processing will be more than the signal section progress clipping operation of high and low thresholds, to convert the signals to non-negative
Real number signal；S12, in the first time slot, carry out intensity modulated after the real number time-domain signal is converted into nonnegative real number signal,
Current signal comprising information is converted into the first visible light signal and is sent to relay node, first visible light signal
Light intensity changes as current signal amplitude changes, specifically, making transmitting module non-negative to what is obtained by light emitting diode
Real number signal carries out intensity modulated, and the current signal of the amplitude variation comprising information is converted into light intensity with letter by LED
The variation of number amplitude and the first visible light signal changed, that is, load the information into the variation of light intensity, and is sent to by LED
After node；S13, at the first time slot end, after relay node receives the first visible light signal from information source node, utilize
Photodiode directly detects the signal, and the electric current that first visible light signal demodulation is reduced into amplitude variation is believed
Number, specifically, the visible light signal that light intensity changes to be reduced into the current signal of amplitude variation, section is relayed used in the present invention
Point is decode-and-forward relay, therefore relay node demodulates obtained current signal, obtains letter transmitted by information source node
Source signal；S14, the relay node signal to be transmitted obtained demodulated signal and relay node itself are carried out according to NOMA technology
Superposition, i.e., be overlapped two kinds of signals on power domain according to certain power allocation scheme, obtain mixed signal.
S2, in second time slot so that relay node using NOMA technology will from information source node and relay node from
The information of body is overlapped on power domain, and is respectively completed the communication of relay node to two destination nodes.Further, S2
Include the following steps: S21, in the second time slot, the mixed signal is converted into time-domain signal and obtains non-negative real number letter
Number, specifically, relay node carries out IFFT to obtained mixed signal is superimposed in the second time slot, time-domain signal is obtained, and
Direct current biasing is added to it, non-linear slicing processing is executed, obtains non-negative real number signal；S22, to the nonnegative real number signal
Intensity modulated is carried out, the second visible light signal is obtained, is sent to different receiving nodes by different visible light channels respectively
That is destination node obtains specifically, relay node carries out intensity modulated to obtained nonnegative real number signal by LED with letter
The variation of number amplitude and the visible light signal changed, are sent to different receiving nodes by different visible light channels respectively；
S23, two different receiving nodes receive after second visible light signal of relay node, utilize two pole of photoelectricity
Pipe directly detects it, and the second visible light signal that light intensity changes is converted into the current signal of amplitude variation respectively；
S24, received electric current is believed respectively according to the demodulation sequence of known channel gain and NOMA in two receiving nodes
It number is demodulated, and calculates separately the signal-to-noise ratio and handling capacity of respective desired signal in conjunction with carried out clipped noise,
And it is analyzed.
Further, in the method, modeling analysis has been carried out to the non-linear clipping operation in two time slots, with
Clipped noise is obtained about slicing high and low thresholds, the expression formula of direct current biasing and signal power；Simultaneously in different time-gap
The handling capacity for receiving signal proposes four optimization methods:
(1) handling capacity of the source signal received to relay node in the first time slot maximizes, and obtains for the first time
Optimal dc-bias in non-linear clipping procedure；
(2) optimal dc-bias obtained in (1) is substituted into this analytic process, to two destination nodes in the second time slot
The sum of the handling capacity of the source signal and relaying signal that are respectively received carries out maximization processing, obtains non-linear for the second time cut
Optimal dc-bias during wave；
(3) two optimal dc-bias obtained in (1) and (2) are substituted into this analytic process, in the second time slot two
The sum of the handling capacity of source signal and relaying signal that a destination node is respectively received carries out maximization processing, obtains information source
Optimal power allocation factor between node and relay node；
(4) two optimal dc-bias obtained in (1) and (2) are substituted into this analytic process, in the second time slot two
The sum of the handling capacity of source signal and relaying signal that a destination node receives carries out maximization processing, obtains being relayed to two
The optimal power allocation factor of link between a destination node.
Based on above scheme, the invention proposes a kind of relay cooperative rooms that much information forwarding simultaneously is realized based on NOMA
Interior visible light communication system, it is as shown in Figure 2 that illustraton of model is applicable in scene.The office's construction for taking comparison classical is as sample
1 explains this system, i.e., in closed room, is 1. the headlight on overhead room, in this as the information source node of this system；
2. being the desk lamp on desk, 3. it is laptop in this as the secondary light source, that is, relay node of this system, is in this as this
The destination node corresponding to information source node in system；4. being mobile phone, in this as the mesh corresponding to relay node in this system
Node.Due to information source node 1. and information source destination node 3. between visible light signal transmission may be by the screening of barrier
Gear, and farther out, optical signal is by more decaying for distance therebetween.As shown in Figure 1, the illumination range of information source node 1. can not
It covers destination node 3., so secondary light source desk lamp is taken 2. to be used as the relay node in system, completes information source node to cooperate
1. and information source destination node 3. between information transmission.It in the present system, include two independent time slots, in first time slot,
1. 2. information source node sends information to relay node；In second time slot, 2. relay node forwards the information source information received
3. to signal source receiving node, it while by own message with the information source information of forwarding sends together, 4. by relaying destination node
It receives and demodulates.
As shown in figure 3, workflow of this system in first time slot is as follows:
(101) transmitting module of information source node 1. handles information source message, i.e., is gone here and there simultaneously to information source information first
Binary digit serial number word signal is converted the parallel frequency-domain signals that pluralize by conversion and QAM modulation；
(102) obtained plural parallel frequency-domain signals are operated and (gained signal is conjugated, and is carried out
Overturning, is obtained N-2 row plural number parallel signal；The signal that two rows are all 0 is added to the position of the 1st row and N/2+1 again,
N row plural number parallel signal is collectively formed with obtained N-2 row signal), so that this N row plural number parallel signal is had hermitian symmetrical
Characteristic (N is the carrier number in multi-carrier communications systems herein)；
(103) N point IFFT is carried out to the obtained signal with hermitian symmetry characteristic, obtains real number time-domain signal；
(104) cyclic prefix is added to real number time-domain signal, and carries out parallel-serial conversion, converted the signal into comprising before circulation
The serial time domain signal sewed；
(105) power scaling is carried out to obtained time-domain signal, power distribution principle meets:
P1=(1- α) P,
P2=α P.
Wherein, P is the information source node 1. general power with relay node 2., is kept constant not in the whole system course of work
Become；α be information source node 1. and relay node 2. between power allocation factor, P1For information source node 1. assigned power, P2
The power being 2. assigned to for relay node.
It (106) is P to powerSSignal add direct current biasing, while carrying out non-linear clipping operation, make must to send
Time-domain signal becomes non-negative real number signal.
(107) by obtained nonnegative real number signal loading to the end LED, by intensity modulated and the characteristic of LED, by amplitude
Light intensity is converted into the current signal that information source information changes to send out with the visible light signal that current signal amplitude changes and changes
It goes；And 2. relay node is sent to by visible light channel.
As shown in figure 4, workflow of this system in second time slot is as follows:
(201) this system decode-and-forward relay node 2. pass through photodiode PD to received visible light signal into
Row directly detects, and the visible light signal that 1. light intensity that information source node sends over changes with information source information variation is converted into
It is demodulated after the current signal that amplitude changes therewith, obtains decoded information source information；Then to the obtained letter of decoding
Source information carries out serioparallel exchange and QAM modulation, and obtained binary digital information is converted the Parallel frequency domain that pluralizes again
Signal.Herein, the signal-to-noise ratio and handling capacity for the information source information from information source node 1. that 2. relay node receives are as follows:
Wherein, γ1And R1Respectively required signal-to-noise ratio and handling capacity, h11. arrived for information source node relay node 2. between
Channel gain,It is 1. clipped noise power that information source node is located, PnIt is channel noise power, while assumes in whole system,
The channel noise power of all channels is all identical；
(202) obtained plural parallel frequency-domain signals are handled, it is made to have hermitian symmetry characteristic；
(203) N point IFFT operation is carried out to the obtained signal for having hermitian symmetry characteristic, obtains real number time domain letter
Number；
(204) cyclic prefix is added to real number time-domain signal, and carries out parallel-serial conversion, converted the signal into containing before circulation
The serial time domain signal sewed；
(205) power scaling is carried out to obtained time-domain signal, wherein the power distribution principle in power scaling meets:
P3=(1- β) P2,
P4=β P2.
P3Power assigned by the information source information 2. forwarded for relay node, P4Itself letter 2. sent for relay node
The assigned power of breath, β is power allocation factor between the two；
(206) simultaneously, 2. relay node carries out identical operation to the information of relay node itself, and obtaining power is P4's
Real number time-domain signal；
(207) 2. relay node is folded the information of the information source information of forwarding and relay node itself on power domain
Add, obtain mixed signal:
Y=(1- β) y1+βy2
Wherein, y is 2. signal that relay node will be sent to two destination nodes, y1It is 2. relay node is received and demodulated
The obtained signal from information source node 1., y2It is relay node itself the relaying signal 2. to be sent；
(208) 2. relay node adds direct current biasing to the mixed signal that superposition obtains and carries out non-linear clipping operation,
3. and 4. obtain being sent respectively to after non-negative real number signal two destination nodes；
(209) 2. signal that relay node is sent pass through respectively relay node 2. between two destination nodes can
Light-exposed channel, at the photodiode PD for reaching two destination node ends；
(210) photodiode PD is directly examined to what is received from the visible light signal of relay node 2. respectively
It surveys, the visible light signal that light intensity changes is converted into the current signal that amplitude changes therewith；
(211) two destination nodes are according to the channel condition of two visible optical links and the basic demodulation principle of tradition NOMA
(the poor user information of i.e. first demodulated channel condition, the remaining user information of re-demodulation), determines respective demodulation sequence；
(212) assume 2. relay node arrives the channel condition of relay reception node 4. better than the channel of signal source receiving node 3.
Condition, the P distributed3> P4, therefore 3. locate in signal source receiving node, directly information source information is demodulated, by trunk information
It is considered as noise；And 4. locate in relay reception node, it needs first to carry out serial interference before demodulating the trunk information and disappears
It removes, subtracts the information source information part received in signal, then demodulate to trunk information；Later in conjunction with the clipped noise carried out
Calculate separately respective desired signal signal-to-noise ratio and handling capacity after analyzed, specifically include:
The signal-to-noise ratio and handling capacity of 3. information source information that signal source receiving node obtains are respectively as follows:
Wherein, γ3And R3It is the letter of the 3. information source information from relay node 2. that signal source receiving node receives respectively
Make an uproar than and handling capacity, h3It is 2. relay node arrives the channel gain of signal source receiving node 3.,It is 2. relay node is located to carry out
Clipped noise power caused by non-linear clipping operation；
The signal-to-noise ratio and handling capacity of the relay reception node trunk information that 4. place obtains are respectively as follows:
Wherein, γ4And R4The respectively signal-to-noise ratio and handling capacity of the trunk information that 4. receive of relay reception node.
According to the characteristic of decode-and-forward relay, the signal-to-noise ratio of 3. information source information that signal source receiving node receives are as follows:
R=min (R1, R3)
To R1It optimizes, obtains dc-bias optimal in first time clipping procedure；To R+R4It optimizes, obtains
Optimal dc-bias in second of clipping procedure, optimal power allocation factor α and β.
The present invention also provides a kind of relay cooperative indoor visible light communication system based on NOMA, the visible light communication
System includes at least two time slots, an information source node, a relay node and two respectively with the information source node and in
After the corresponding destination node of node；It is characterized in that, the visible light communication system further include:
It is placed in the transmitting module of information source node, is used to for information source message to be converted into real number time-domain signal, and at first
In gap, intensity modulated is carried out after the real number time-domain signal is converted into nonnegative real number signal, by the current signal comprising information
It is converted into the first visible light signal and is sent to relay node, the light intensity of first visible light signal is with current signal amplitude
Change and changes；
The relay node is used to that first visible light signal demodulation to be reduced into amplitude and is become at the first time slot end
The current signal of change and be overlapped signal that the current signal and relay node to be transmitted itself according to NOMA is mixed
Close signal；The relay node is also used in the second time slot, and the mixed signal is converted into time-domain signal and is obtained non-negative
Real number signal carries out intensity modulated to the nonnegative real number signal, obtains the second visible light signal, respectively by different visible
Optical channel is sent to different receiving nodes i.e. destination node；
Each receiving node is used for after receiving second visible light signal, respectively by the of light intensity variation
Two visible light signals be converted into amplitude variation current signal and received current signal is demodulated, and combine institute into
Capable clipped noise is analyzed the signal-to-noise ratio for calculating separately out respective desired signal and is analyzed after handling capacity.
Although the present invention illustrate and described with regard to embodiments above, those skilled in the art should be managed
Solution, if be no more than scope defined by the claims of the present invention, so that it may to the present invention carry out it is various it is corresponding modification or
Person's replacement.
Claims (4)
1. a kind of relay cooperative indoor visible light communication method based on NOMA, which comprises the steps of:
S1, in visible light communication system, by relay cooperative, cooperation completes information source node to mesh in two independent time slots
Node communication, the visible light communication system include at least two time slots, in first time slot, information source node is to information source
Information is handled, and is obtained the first visible light signal and is sent it to relay node, and relay node is obtained from information source node
The first visible light signal, and convert it into corresponding current signal；
S2, in second time slot so that relay node will be from information source node and relay node itself using NOMA technology
Information is overlapped on power domain, and is respectively completed the communication of relay node to two destination nodes.
2. the method according to claim 1, wherein S1 includes the following steps:
S11, information source message is converted by real number time-domain signal by the information source node of visible light communication system；
S12, in the first time slot, carry out intensity modulated after the real number time-domain signal is converted into nonnegative real number signal, will wrap
The current signal of the variation of amplitude containing information is converted into the first visible light signal and is sent to relay node, the first visible light letter
Number with light intensity signal amplitude change and change；
S13, at the first time slot end, first visible light signal demodulation is reduced into the current signal of amplitude variation；
S14, relay node fold the signal that obtained demodulated signal and relay node to be transmitted itself according to NOMA technology
Add.
3. according to the method described in claim 2, it is characterized in that, S2 includes the following steps:
S21, in the second time slot, the mixed signal is converted into time-domain signal and obtains non-negative real number signal；
S22, intensity modulated is carried out to the nonnegative real number signal, obtains the second visible light signal, respectively by different visible
Optical channel is sent to different receiving nodes i.e. destination node.
It is visible by the second of light intensity variation respectively after S23, two different receiving nodes receive second visible light signal
Optical signal is converted into the current signal of amplitude variation.
S24, received current signal is demodulated in each receiving node, and combines carried out clipped noise analysis point
The signal-to-noise ratio and handling capacity of respective desired signal are not calculated, and are analyzed.
4. a kind of relay cooperative indoor visible light communication system based on NOMA, the visible light communication system includes at least two
Time slot, an information source node, the purpose corresponding with the information source node and relay node respectively of a relay node and two
Node；It is characterized in that, the visible light communication system further include:
It is placed in the transmitting module of information source node, is used to for information source message to be converted into real number time-domain signal, and in the first time slot,
Intensity modulated is carried out after the real number time-domain signal is converted into nonnegative real number signal, the current signal comprising information is converted into
First visible light signal is simultaneously sent to relay node, the light intensity of first visible light signal change with current signal amplitude and
Variation；
The relay node, is used at the first time slot end, and first visible light signal demodulation is reduced into amplitude variation
The signal that the current signal and relay node itself to be transmitted simultaneously is overlapped to obtain and mixes letter by current signal according to NOMA
Number；The relay node is also used in the second time slot, and the mixed signal is converted into time-domain signal and obtains non-negative real number
Signal carries out intensity modulated to the nonnegative real number signal, obtains the second visible light signal, believed respectively by different visible lights
Road is sent to different receiving nodes i.e. destination node；
Each receiving node is used for after receiving second visible light signal, respectively can by the second of light intensity variation
Light-exposed signal is converted into the current signal of amplitude variation and demodulates to received current signal, and combines and carried out
Clipped noise is analyzed the signal-to-noise ratio for calculating separately out respective desired signal and is analyzed after handling capacity.
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