CN109617602A - Link interference suppressing method, device, electronic equipment and storage medium - Google Patents
Link interference suppressing method, device, electronic equipment and storage medium Download PDFInfo
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- CN109617602A CN109617602A CN201811467703.XA CN201811467703A CN109617602A CN 109617602 A CN109617602 A CN 109617602A CN 201811467703 A CN201811467703 A CN 201811467703A CN 109617602 A CN109617602 A CN 109617602A
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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
Abstract
A kind of link interference suppressing method is applied to visible light communication network, comprising: generates transmitting terminal interference figure according to the channel information between transmitting terminal and receiving end；Several transmitting terminal packet modes to be selected are determined according to the transmitting terminal interference figure, wherein each transmitting terminal packet mode to be selected includes that the transmitting terminal is divided into multiple groupings, and the transmitting terminal of different grouping sends information in mutually orthogonal mode；For each transmitting terminal packet mode optimization transmitting terminal and the connection ratio of receiving end and the power of transmitting terminal to be selected to maximize the network utility under each transmitting terminal packet mode to be selected；The power for determining the connection ratio and transmitting terminal of the transmitting terminal packet mode to be selected and corresponding transmitting terminal and receiving end when network utility maximum is AF panel strategy；Wherein, the transmitting terminal is light source transmitting terminal, and the receiving end is photodiode receiving end.The present invention also provides a kind of device, electronic equipment and storage mediums, and network overall utility can be improved.
Description
Technical field
The present invention relates to the communications fields, and in particular to a kind of link interference suppressing method, device, electronic equipment and storage are situated between
Matter.
Background technique
Visible light communication (Visible Light Communication, VLC) is due to its ultra-wide frequency spectrum, low-power consumption, access
Point easy dense deployment the advantages that and be suitable for intensive wireless network application scenarios.In visible light communication network, it is seen that optical channel with
The angle and field angle of transmitting terminal and receiving end are related.It therefore, can also even if closely located VLC transmitting terminal and receiving end
It can not be connected with each other due to.So, it is seen that in optical communication network usually not as in radio frequency network
Fixed cell form, thus, it not can be used directly the link interference suppressing method in conventional radio frequency network.
Current visible light communication network link interference suppressing method be by when frequency division multiplexing based on receiving end position
AF panel is realized in the methods of scheduling.In current visible light communication network link interference suppressing method, it is assumed that receiving end
Connection between transmitting terminal is fixed and invariable.But when distribution of light sources is intensive, each receiver can in its field angle
There can be multiple transmitting terminals, receiver can be by any transmitting terminal for being dynamically connect in its field angle with balanced different transmitting terminals
Traffic load.Simultaneously as visible light communication link and receiver directional correlation, even if receiving end position without too big change
Dynamic, the direction of receiving end, which changes, may also lead to the attachable transmitting terminal in receiving end and changes, so as to cause existing
Assuming that the link interference Restrain measurement performance that receiving end and transmitting terminal are connected and fixed declines.
Summary of the invention
In consideration of it, can be improved it is necessary to provide a kind of link interference suppressing method, device, electronic equipment and storage medium
Network overall utility.
The first aspect of the application provides a kind of link interference suppressing method, is applied to visible light communication network, the side
Method includes:
Transmitting terminal interference figure is generated according to the channel information between transmitting terminal and receiving end, the transmitting terminal interference figure includes
Company's side right value between several nodes and node, each one transmitting terminal of node on behalf, several all transmitting terminals of node on behalf,
Company's side right value between the node represents the interference strength between transmitting terminal；
Several transmitting terminal packet modes to be selected are determined according to the transmitting terminal interference figure, wherein each hair to be selected
Sending end packet mode includes that the transmitting terminal is divided into multiple groupings, and the transmitting terminal of different grouping is sent in mutually orthogonal mode
Information；
For the connection ratio and transmitting terminal of each transmitting terminal packet mode optimization transmitting terminal to be selected and receiving end
Power is to maximize the network utility under each transmitting terminal packet mode to be selected；
The connection of transmitting terminal packet mode and corresponding transmitting terminal and receiving end to be selected when determining network utility maximum
The power of ratio and transmitting terminal is AF panel strategy；
Wherein, the transmitting terminal includes light source, and for sending optical signal, the receiving end is for receiving optical signal.
Further, the channel information generation transmitting terminal interference figure according between transmitting terminal and receiving end includes:
According to the channel information between transmitting terminal and receiving end, determines and be directed to each receiving end between every two transmitting terminal
Interference strength；
Determine being directed to each between corresponding two transmitting terminals of company's side right value between transmitting terminal interference figure interior joint
The average value of the interference strength of receiving end.
Further, described to determine that transmitting terminal packet mode to be selected includes: according to the transmitting terminal interference figure
Select K node as the central node of initial packet from all nodes in the transmitting terminal interference figure,
His node is to packet node；
Selection one is to packet node；
Determine select it is described to packet node and each grouping company's side right value for described in selection to packet node
The maximum value of company's side right value between the grouping interior joint；
Connect the smallest grouping of side right value to packet node with described for being added described in selection to packet node；
Other are waited for that corresponding grouping is added in packet node, wherein if only currently corresponding point will be added to packet node
It, will be described next wait divide according to next minimum even side right value in packet node and company's side right value of each grouping after group
Group node, which is added, next connects the smallest grouping of side right value to packet node with described；
The central node for redefining the grouping is to connect the smallest node of side right value mean value with other nodes in group, again
Determine that other nodes are to packet node；
Iteration is until meet preset condition.
Further, the preset condition is to reach iteration preset times or be grouped no longer to change.
Further, it is described for the connection ratio of each transmitting terminal packet mode optimization transmitting terminal to be selected and receiving end with
And the power of transmitting terminal includes: to maximize the network utility under each transmitting terminal packet mode to be selected
Optimize transmitting terminal and receiving end under the power of given transmitting terminal for each transmitting terminal packet mode to be selected
Connection ratio；
Optimize hair under the connection ratio of given transmitting terminal and receiving end for corresponding transmitting terminal packet mode to be selected
The power of sending end；
Iteration is until result restrains.
Further, described to optimize transmitting terminal under the power of given transmitting terminal for each transmitting terminal packet mode to be selected
Connection ratio with receiving end is convex optimization problem.
Further, the power for optimizing transmitting terminal under the connection ratio of given transmitting terminal and receiving end includes:
Optimize the power of transmitting terminal under the connection ratio of given transmitting terminal and receiving end using convex row approximate algorithm.
The second aspect of the application provides a kind of link interference inhibition device, is applied to visible light communication network, the dress
It sets and includes:
Interference figure generation module, for generating transmitting terminal interference figure according to the channel information between transmitting terminal and receiving end,
The transmitting terminal interference figure includes company's side right value between several nodes and node, each one transmitting terminal of node on behalf, if described
Dry all transmitting terminals of node on behalf, company's side right value between the node represent the interference strength between transmitting terminal；
Packet mode determining module, for determining several transmitting terminal grouping sides to be selected according to the transmitting terminal interference figure
Formula, wherein each transmitting terminal packet mode to be selected includes that the transmitting terminal is divided into multiple groupings, the transmitting terminal of different grouping
Information transmission is carried out in mutually orthogonal mode；
Network utility maximizes module, for for each transmitting terminal packet mode optimization transmitting terminal and receiving end to be selected
Connection ratio and transmitting terminal power to maximize the network utility under each transmitting terminal packet mode to be selected；
AF panel strategy determining module, for transmitting terminal packet mode to be selected when determining network utility maximum and right
The connection ratio of the transmitting terminal and receiving end answered and the power of transmitting terminal are AF panel strategy；
Wherein, the transmitting terminal includes light source, and for sending optical signal, the receiving end is for receiving optical signal.
The third aspect of the application provides a kind of electronic equipment, and the electronic equipment includes processor and memory, described
Processor realizes link interference described in any one as above when being used to execute at least one instruction stored in the memory
Suppressing method.
The fourth aspect of the application provides a kind of computer readable storage medium, the computer-readable recording medium storage
There is at least one instruction, at least one described instruction is executed by processor to realize that link interference described in any one as above presses down
Method processed.
This programme generates transmitting terminal interference figure according to transmitting terminal and the channel information of receiving end, for describing between transmitting terminal
Interference strength, and then reasonable transmitting terminal packet mode to be selected, the transmission of different grouping are generated according to transmitting terminal interference figure
End sends signal in mutually orthogonal mode, the interference between visible light communication link is reduced, by transmitting terminal and reception
The connection ratio at end and the optimization of transmitting terminal power ensure that not as far as possible while improving receiving end up to spectrum efficiency
It is balanced with the spectrum efficiency between receiving end, by determining the transmitting terminal packet mode and correspondence to be selected when network utility maximum
Transmitting terminal and receiving end connection ratio and transmitting terminal power be AF panel strategy, solve amorphous cell structure
Visible light communication network in link interference problem under receiving end and transmitting terminal Dynamic link library scene, improve network and integrally imitate
With.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is that the link interference of a preferred embodiment of the present invention inhibits the block diagram of device.
Fig. 2 is the application scenario diagram of a preferred embodiment of the present invention.
Fig. 3 is the flow chart of the link interference suppressing method of a preferred embodiment of the present invention.
Fig. 4 is a preferred embodiment of the present invention according to transmitting terminal and the channel information of receiving end generation transmitting terminal interference figure
Schematic diagram.
Fig. 5 is the present invention and the frequency of pedestal method one and pedestal method two about receiving end of a preferred embodiment of the present invention
Figure is compared in the emulation of spectrum efficiency.
Fig. 6 is that the present invention of a preferred embodiment of the present invention is imitated with pedestal method one and pedestal method two about averaging network
Figure is compared in emulation when used in field angle variation.
The present invention and pedestal method one, pedestal method two and enumerative technique that Fig. 7 is a preferred embodiment of the present invention are about net
Figure is compared in the cumulative distribution function emulation of network effectiveness.
Fig. 8 is the schematic diagram for the electronic equipment that a preferred embodiment of the present invention provides.
The present invention that the following detailed description will be further explained with reference to the above drawings.
Main element symbol description
Network link interference rejection unit 10
Interference figure generation module 11
Packet mode determining module 12
Network utility maximizes module 13
AF panel strategy determining module 14
Electronic equipment 8
Memory 81
Processor 82
Computer program 83
The present invention that the following detailed description will be further explained with reference to the above drawings.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying example, the present invention will be described in detail.It should be noted that in the absence of conflict, embodiments herein and embodiment
In feature can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
Fig. 1 is a preferred embodiment of the present invention the block diagram that link interference inhibits device.The link interference inhibits dress
It is set to a kind of link interference inhibition device based on interference figure, is applied to visible light communication network.As shown in Figure 1, the network
It includes: interference figure generation module 11, packet mode determining module 12, network utility maximization module that link interference, which inhibits device 10,
13 and AF panel strategy determining module 14.The interference figure generation module 11 is used for according to the letter between transmitting terminal and receiving end
Road information generates transmitting terminal interference figure.Wherein, the transmitting terminal includes light source, and for sending optical signal, the receiving end is used for
Receive optical signal.The transmitting terminal interference figure includes company's side right value between several nodes and node, and each node on behalf one is sent out
Sending end, several all transmitting terminals of node on behalf.It is strong that company's side right value between the node represents the interference between transmitting terminal
Degree.The packet mode determining module 12 is used to determine several transmitting terminal grouping sides to be selected according to the transmitting terminal interference figure
Formula, wherein each transmitting terminal packet mode to be selected includes that the transmitting terminal is divided into multiple groupings, the transmitting terminal of different grouping
Information transmission is carried out in mutually orthogonal mode.The network utility maximizes module 13 and is used to be directed to each transmitting terminal to be selected
The power of the connection ratio and transmitting terminal of packet mode optimization transmitting terminal and receiving end is to maximize each transmitting terminal to be selected point
Network utility under group mode.The AF panel strategy determining module 14 is used to determine the hair to be selected when network utility maximum
The power of the connection ratio and transmitting terminal of sending end packet mode and corresponding transmitting terminal and receiving end is AF panel strategy.With
It is lower module to be described in detail based on the flow chart of the visible light communication network link interference suppressing method of interference figure in conjunction with a kind of
The concrete function of 11-14.
Fig. 2 is a preferred embodiment of the present invention application scenario diagram.As shown in Fig. 2, comprising more in visible light communication network
A transmitting terminal and multiple receiving ends.In the present embodiment, the transmitting terminal is light source transmitting terminal, described for sending optical signal
Receiving end is photodiode receiving end, for receiving optical signal.
In order to illustrate the embodiments of the present invention more clearly, detailed introduction is made to the visible light communication network below:
It include N in the visible light communication networktA transmitting terminal and NrA receiving end.The NtA transmitting terminal is for servicing
NrA receiving end.One of transmitting terminal can service multiple receiving ends, and each receiving end can also be in dynamic select its field angle
Any transmitting terminal is attached.The direct projection diameter channel gain of receiving end i and transmitting terminal j indicates are as follows:
Wherein hi,jFor the direct projection diameter channel gain of receiving end i and transmitting terminal j, ρ represents the sensitivity of receiving end, and m represents bright
Rich coefficient, APDIndicate the physical area of the photodiode of receiving end, nrIndicate the refractive index of receiving end, θ is direct projection diameter and hair
Angle between sending end normal vector, angle of the ψ between direct projection diameter and receiving end normal vector, d indicate transmitting terminal and receiving end it
Between distance, ΨcIndicate receiver field angle.
The Connection Time ratio of receiving end i and transmitting terminal j are as follows:
Wherein, αi,jFor the Connection Time ratio of receiving end i and transmitting terminal j,Indicate receiving end i and hair in T time
The Connection Time of sending end j.
The packet mode of transmitting terminal is expressed asWherein K is packet count, NkIndicate the transmitting terminal of k-th of grouping
Set.The subscript I being grouped where j-th of transmitting terminaljIt indicates.Light source caused by the transmitting terminal of difference group is in an orthogonal manner
Send information.Due to using time, frequency domain to carry out being multiplexed with equivalent equivalence when analyzing receiving end spectrum efficiency, be
Description it is simple, is illustrated below using time-multiplexed.At this point, the spectrum efficiency of receiving end i may be expressed as:
Wherein, RiFor the spectrum efficiency of receiving end i, αi,jFor the Connection Time ratio of receiving end i and transmitting terminal j, | hi,j|
For the direct projection diameter channel gain of receiving end i and transmitting terminal j, PjFor the transmission power of j-th of transmitting terminal, | hi,l| for receiving end i with
The direct projection diameter channel gain of transmitting terminal l,For the grouping where j-th of transmitting terminal, PlFor the transmission function of first of transmitting terminal
Rate,To receive the noise power in signal.
Wherein, the connecting link Signal to Interference plus Noise Ratio of receiving end i and transmitting terminal j are as follows:
Wherein, SINRI, jFor the connecting link Signal to Interference plus Noise Ratio of receiving end i and transmitting terminal j, | hi,j| for receiving end i and send
Hold the direct projection diameter channel gain of j, PjFor the transmission power of j-th of transmitting terminal, | hi,l| increase for the direct projection diameter channel of i and transmitting terminal l
Benefit,For the grouping where j-th of transmitting terminal, PlFor the transmission power of first of transmitting terminal,To receive making an uproar in signal
Acoustical power.
According to the spectrum efficiency formula of receiving end i, it can be seen that transmitting terminal packet mode, transmitting terminal send power and
The connection ratio of receiving end and transmitting terminal can all influence the spectrum efficiency of receiving end, it is therefore desirable to use suitable AF panel side
Method guarantees the equilibrium of the spectrum efficiency of different receiving ends reducing as far as possible while interference.
Fig. 3 is a preferred embodiment of the present invention the flow chart of link interference suppressing method, the link interference inhibition side
Method is a kind of link interference suppressing method based on interference figure, is applied to visible light communication network.As shown in figure 3, this method packet
It includes:
S31, transmitting terminal interference figure, the transmitting terminal interference figure are generated according to the channel information between transmitting terminal and receiving end
Including company's side right value between several nodes and node, each one transmitting terminal of node on behalf, several all hairs of node on behalf
Sending end, company's side right value between the node represent the interference strength between transmitting terminal.
Fig. 4, which is a preferred embodiment of the present invention, generates transmitting terminal interference figure according to transmitting terminal and the channel information of receiving end
Schematic diagram.In Fig. 4, (a) indicates the channel information of transmitting terminal and receiving end, (b) indicates transmitting terminal interference figure.The transmission
Holding the node in interference figure is all transmitting terminals, and company's side right value between node indicates the interference strength between transmitting terminal.
The channel information according between transmitting terminal and receiving end generates transmitting terminal interference figure
A1: according to the channel information between transmitting terminal and receiving end, determine that being directed between every two transmitting terminal each connects
The interference strength of receiving end.
It is dry between different transmitting terminals since visible light channel and the direction and field angle of transmitting terminal and receiving end are related
Disturbing intensity can not simply be indicated with relative distance.And interference strength between two transmitting terminals is practical depends on receiving end simultaneously
Interference strength when receiving the signal of the two transmitting terminals between two kinds of signals.Therefore, for single receiving end i, two transmitting terminals
Interference strength between j, l are as follows:
Wherein, ej,l(i) for for single receiving end i, interference strength between two transmitting terminal j, l, | hi,j| for receiving end i with
The direct projection diameter channel gain of transmitting terminal j,For a mean power in transmitting terminal linear operating region, | hi,l| for receiving end i and hair
The direct projection diameter channel gain of sending end l,To receive the noise power in signal.
A2: being directed to often between corresponding two transmitting terminals of company's side right value between transmitting terminal interference figure interior joint is determined
The average value of the interference strength of a receiving end.
The average value of the interference strength for each receiving end between described two transmitting terminal j, l are as follows:
Wherein, ej,lThe average value of the interference strength for each receiving end between two transmitting terminals j, l；NrTo connect
The sum of receiving end, ej,l(i) for for single receiving end i, interference strength between two transmitting terminal j, l.Wherein, the even side right value
If the more interference that works at the same time between two transmitting terminals of two transmitting terminal of Gao Daibiao is stronger.
In the present embodiment, transmitting terminal interference figure is generated according to transmitting terminal and the channel information of receiving end, passes through different hairs
The influence that sending end works at the same time for receiving end received signal quality determines interference strength between transmitting terminal, can describe direction
Interference between the visible light communication link of property.
S32, several transmitting terminal packet modes to be selected are determined according to the transmitting terminal interference figure, wherein each to be selected
Transmitting terminal packet mode include that the transmitting terminal is divided into multiple groupings, the transmitting terminal of different grouping is in mutually orthogonal mode
Send information.
In the present embodiment, it if it is considered that all possible transmitting terminal packet mode, number is very huge, therefrom selects most
Excellent packet mode complexity is very high.And in the transmitting terminal interference figure, even side right value is higher means between two transmitting terminals
Interference it is stronger.Therefore, two high transmitting terminals of even side right value are assigned into different groups of packet mode compared to other packet modes
The interference between visible light communication link is more likely effectively reduced.Under this principle, determined according to transmitting terminal interference figure a kind of
The transmitting terminal packet mode interfered between visible light communication link can be effectively reduced as transmitting terminal to be selected for K's in packet count
Packet mode, wherein K is any positive integer for being not more than transmitting terminal number, thus, obtain NtA relatively reasonable hair to be selected
Sending end packet mode.
Specifically, described to determine that transmitting terminal packet mode to be selected includes: according to the transmitting terminal interference figure
Determine that the transmitting terminal packet mode to be selected be the packet count according to determined by the transmitting terminal interference figure is K's
Transmitting terminal packet mode, wherein K is any positive integer for being not more than transmitting terminal number.
The present invention is selected from the more reasonable transmitting terminal packet mode of minority generated according to transmitting terminal interference figure, phase
Than being selected in from all possible transmitting terminal packet mode, the complexity of selection is significantly reduced.
Determine that the transmitting terminal packet mode to be selected be the packet count according to determined by the transmitting terminal interference figure is K's
Transmitting terminal packet mode includes:
C1: selecting K node as the central node of initial packet from all nodes in the transmitting terminal interference figure,
Other nodes are to packet node.
In the present embodiment, described to select K node to randomly choose K node.Each initial packet includes a center
Node.Described that K node is selected as to form K grouping as the central node of initial packet, each node selected is one
The central node of grouping.
C2: selection one is to packet node.
Described select one can be for random selection one to packet node or in particular order to packet node, such as arranges
At first, the selection one such as roll into last place is to packet node.
C3: the described company's side right value being grouped to packet node with each selected is determined to save described in selection wait be grouped
The maximum value of company's side right value between node in point and the grouping.
When only having central node in a grouping, the node in packet node and the grouping of selection
Between company's side right value maximum value be selection company's side right value between packet node and the central node.Work as institute
State company's side right value in grouping when not only having central node, between the node in packet node and the grouping of selection
Maximum value be company's side right value between the central node in packet node and the grouping and in the grouping
The maximum value in company's side right value between each non-central node.For example, for grouping 1, it is described in packet node and grouping 1
Company's side right value between central node is that company's side right value between the non-central node in 0.4, with grouping 1 is 0.3,0.5, for
Grouping 2, company's side right value between packet node and the central node being grouped in 2 are non-central in 0.2, with grouping 2
Company's side right value between node is 0.3, then the maximum value of company's side right value between the node in packet node and grouping 1
It is 0.5, and the maximum value of company's side right value between the node in grouping 2 is 0.3.
C4: connect the smallest grouping of side right value to packet node with described for being added described in selection to packet node.
It is described that described be added to packet node is connected the smallest grouping of side right value to packet node and can be with described, such as:
It is described to packet node and grouping 1 company's side right value be 0.3, it is described to packet node and grouping 2 company's side right value be 0.5, institute
It states when packet node and company's side right value of grouping 3 are 0.6, described be added to packet node is connected into side to packet node with described
The grouping that weight is 0.3.
C5: other are waited for that corresponding grouping is added in packet node, wherein if only will currently be added to packet node corresponding
After grouping, according to the minimum even side right value in next company's side right value to packet node and each grouping by it is described it is next to
Packet node, which is added, next connects the smallest grouping of side right value to packet node with described.
It is described according to minimum in next company's side right value to packet node and each grouping under even side right value will be described
One to packet node be added with it is described it is next to packet node connect side right value it is the smallest be grouped include:
Determine it is described it is next to packet node and each grouping company's side right value be it is described next to packet node
The maximum value of company's side right value between the node in the grouping；By it is described it is next to packet node be added with it is described next
It is a to connect the smallest grouping of side right value to packet node.
So that other are waited for that packet node adds to corresponding grouping until each all adding to correspondence to packet node one by one
Grouping.
C6: the central node for redefining the grouping is to connect the smallest node of side right value mean value with other nodes in group,
Redefining other nodes is to packet node.
C7: iteration is until meet preset condition.
If the iteration is until meeting preset condition includes: to meet preset condition, algorithm terminates, if being unsatisfactory for presetting
Condition returns to step c2.Wherein, the preset condition is to reach iteration preset times or be grouped no longer to change.
In the present embodiment, it is intended to when the node wait be grouped to be grouped so that it connects side right value most with grouping interior nodes
Big value minimizes, thus, so that connecting between node in each grouping, side right value is as small as possible, and positioned at the node of different grouping
Between company's side right value it is higher.Since the transmitting terminal of different grouping sends information in an orthogonal manner, do not interfere with mutually, because
This, the transmitting terminal of each grouping can be communicated with lower interference.
S33, the connection ratio and transmission for optimizing transmitting terminal and receiving end for each transmitting terminal packet mode to be selected
The power at end is to maximize the network utility under each transmitting terminal packet mode to be selected.
In the present embodiment, in order to guarantee different receiving end spectrum efficiencies while promoting receiving end spectrum efficiency as far as possible
Equilibrium, the network utility be receiving end spectrum efficiency logarithm and, it may be assumed that
Wherein, u ({ Nk) it is network utility, NrFor receiving end number, i is receiving end number, RiFor the frequency spectrum of receiving end i
Efficiency.
In maximization network effectiveness, the power of each transmitting terminal needs to be limited in the linear operating region of light source, simultaneously
All transmitting terminals need to meet general power limitation, it may be assumed that
Pmin≤Pj≤Pmax
Wherein, PjFor the transmission power of j-th of transmitting terminal, PminFor the minimum value of the linear operating region of light source, PmaxFor
The maximum value of the linear operating region of light source, PtIndicate total power constraint.
Simultaneously as the grouping of transmitting terminal, the time scale of a transmitting terminal service receiving end no more than distributes to this
The service time ratio being grouped where transmitting terminal, and a receiving end receives the service time of the transmitting terminal in a certain grouping
Ratio equally no more than distributes to the service time ratio of the grouping.Therefore, the connection ratio of transmitting terminal and receiving end constrains
Are as follows:
αi,j≥0,βk≥0
Wherein, latter two constraint condition then guarantees the connection ratio α acquiredi,jAnd βkIt can physics realization.
Thus, the problem of maximizing the network utility under transmitting terminal packet mode to be selected can be an optimization problem:
Pmin≤Pj≤Pmax
αi,j≥0,βk≥0
Since P1 problem is non-convex problem, transmitting terminal is connected to the optimization of ratio and the optimization of transmitting terminal power with receiving end
Separation, the stationary point of former problem is obtained by iteratively solving in turn.Therefore, excellent for each transmitting terminal packet mode to be selected
Change transmitting terminal and the connection ratio of receiving end and the power of transmitting terminal to maximize under each transmitting terminal packet mode to be selected
Network utility includes:
D1: optimize transmitting terminal and receiving end under the power of given transmitting terminal for each transmitting terminal packet mode to be selected
Connection ratio.
In the present embodiment, optimize under the power of given transmitting terminal for each transmitting terminal packet mode to be selected and send
The connection ratio problems at end and receiving end are as follows:
αi,j≥0,βk≥0
It is described to optimize transmitting terminal and reception under the power of given transmitting terminal for each transmitting terminal packet mode to be selected
The connection ratio problems at end are convex optimization problem, can be solved using convex Optimization Solution algorithms such as interior point methods.
D2: optimize under the connection ratio of given transmitting terminal and receiving end for corresponding transmitting terminal packet mode to be selected
The power of transmitting terminal.
It is described excellent under the connection ratio of given transmitting terminal and receiving end for corresponding transmitting terminal packet mode to be selected
Change the power problem of transmitting terminal are as follows:
Pmin≤Pj≤Pmax
It is described excellent under the connection ratio of given transmitting terminal and receiving end for corresponding transmitting terminal packet mode to be selected
The power problem for changing transmitting terminal is non-convex optimization problem, need to be solved using the approximate algorithm of convex row.
There are lower bounds by known function log (1+x)
Wherein, x0For certain positive real number.Therefore, the lower bound that the spectrum efficiency of receiving end can be acquired using above-mentioned property indicates.
Meanwhile with new power and variableInstead of transmitting terminal powerAnd introduce additional variable ri, transmitting terminal can be obtained
The convex near-optimal problem of power optimization subproblem:
WhereinFor the spectrum efficiency lower bound of receiving end i and transmitting terminal j connecting link, indicate are as follows:
WhereinFor new power and variable, PminFor the minimum value of the linear operating region of light source, PmaxFor the line of light source
The maximum value in sex work region, riFor additional variable, Indicate the Signal to Interference plus Noise Ratio under certain power distribution.
The convex near-optimal problem of the transmitting terminal power optimization problem is convex optimization problem, can be calculated using interior point method etc.
Method is solved.Therefore, the power of the optimization transmitting terminal under the connection ratio of given transmitting terminal and receiving end includes: use
Convex row approximate algorithm optimizes the power of transmitting terminal under the connection ratio of given transmitting terminal and receiving end.It is described to use convex row
The power that approximate algorithm optimizes transmitting terminal under the connection ratio of given transmitting terminal and receiving end includes:
E1: initialization transmitting terminal power PjTo divide equally general power Pt, according to transmitting terminal power PjIt calculates
E2: given power and variableUnder, it calculates
E3: solving convex near-optimal problem, updates power and variable
E4: returning to step e2 and be iterated, untilAnd riVariation be less than a certain threshold value.
The step e4 includes: to work asAnd riVariation be less than a certain threshold value when, algorithm terminates, whenOr riVariation
When more than or equal to a certain threshold value, return step e2.
D3: iteration is until result restrains.
The iteration includes: the return step d1 when result does not restrain up to result convergence, when result convergence, algorithm
Terminate.
In the present embodiment, it by the optimization of connection ratio and transmitting terminal power to transmitting terminal and receiving end, is mentioning
It ensure that the spectrum efficiency between different receiving ends is balanced while high receiving end is up to spectrum efficiency as far as possible.
S34, the transmitting terminal packet mode to be selected when determining network utility maximum and corresponding transmitting terminal and receiving end
The power of connection ratio and transmitting terminal is AF panel strategy.
In the present embodiment, select network utility maximum when transmitting terminal packet mode to be selected and corresponding transmitting terminal and
The connection ratio of receiving end and the power of transmitting terminal solve the visible light of amorphous cell structure as AF panel strategy
Link interference problem in communication network under receiving end and transmitting terminal Dynamic link library scene, improves network overall utility.
The present invention generates transmitting terminal interference figure according to transmitting terminal and the channel information of receiving end, for describing between transmitting terminal
Interference strength, and then reasonable transmitting terminal packet mode to be selected, the transmission of different grouping are generated according to transmitting terminal interference figure
End sends signal in mutually orthogonal mode, the interference between visible light communication link is reduced, by transmitting terminal and reception
The connection ratio at end and the optimization of transmitting terminal power ensure that not as far as possible while improving receiving end up to spectrum efficiency
It is balanced with the spectrum efficiency between receiving end, by determining the transmitting terminal packet mode and correspondence to be selected when network utility maximum
Transmitting terminal and receiving end connection ratio and transmitting terminal power be AF panel strategy, solve amorphous cell structure
Visible light communication network in link interference problem under receiving end and transmitting terminal Dynamic link library scene, improve network and integrally imitate
With.
Fig. 5 is a preferred embodiment of the present invention the present invention and the frequency of pedestal method one and pedestal method two about receiving end
Figure is compared in the emulation of spectrum efficiency.In comparing figure, 5 transmitting terminals are for servicing 10 receiving ends.The detailed of the present embodiment is imitated
True parameter is as shown in table 1:
| Parameter | Value |
| Bright rich Coefficient m | 1 |
| Receiver sensitivity ρ | 0.53A/W |
| Photodiode physical area APD | 1cm2 |
| Receiver refractive index nr | 1.5 |
| Receiver field angle Ψc | 60° |
| Minimum transmitting terminal power Pmin | 0W |
| Highest transmitting terminal power Pmax | 9W |
| Total transmitting terminal power limit Pt | 20W |
In the present embodiment, by visible light communication network link interference suppressing method and two kinds of transmitting terminals based on interference figure
The fixed pedestal method of packet mode is compared about the spectrum efficiency of receiving end.The fixed benchmark of transmitting terminal packet mode
Method one is that all transmitting terminals are divided into a grouping, and the fixed benchmark algorithm two of transmitting terminal packet mode is that adjacent transmitting terminal is assigned to
Different groupings, i.e., 5 transmitting terminals, { a shown in inverted triangle in figure1,a5It is a grouping, { a3,a4It is a grouping, { a2It is one
Grouping.It is to be with circular solid line using the spectrum efficiency of pedestal method receiving end for the moment with rectangular solid line in Fig. 5
The spectrum efficiency of receiving end when using pedestal method two, the solid line with diamond shape are using the visible light communication network based on interference figure
The spectrum efficiency of receiving end when network link interference suppressing method.From fig. 5, it can be seen that the disturbance restraining method based on interference figure
Pedestal method one compared to the grouping of no transmitting terminal can effectively promote receiving end spectrum efficiency, simultaneously as interference figure meter
Specific distribution and the channel that receiving end is considered in calculation, equally may be used compared to the benchmark algorithm two for sending end position grouping is based only upon
To promote the spectrum efficiency of most of receiving end.
Fig. 6 is a preferred embodiment of the present invention the present invention and imitates with pedestal method one and pedestal method two about averaging network
Figure is compared in emulation when used in field angle variation.In Fig. 6, chain-dotted line be using pedestal method for the moment field angle change when
Averaging network utility curve, dotted line are using averaging network utility curve when pedestal method two when field angle changes, solid line
Averaging network effect when to use the visible light communication network link interference suppressing method based on interference figure in field angle variation
Use curve.From fig. 6, it can be seen that compared to two kinds pedestal methods of the visible light communication network disturbance restraining method based on interference figure
It can effectively adapt to the variation of field angle size.
Fig. 7 is a preferred embodiment of the present invention the present invention with pedestal method one, pedestal method two and enumerative technique about net
Figure is compared in the cumulative distribution function emulation of network effectiveness.In Fig. 7, chain-dotted line is using the tired of pedestal method network utility for the moment
Product distribution function curve, the cumulative distribution function curve of network utility when dotted line is using pedestal method two, solid line are to use
The cumulative distribution function curve of network utility when visible light communication network link interference suppressing method based on interference figure, two point
The cumulative distribution function curve of network utility when being marked as using enumerative technique.The enumerative technique, which refers to, enumerates all possible transmission
Packet mode is held, maximizes the network utility under given transmitting terminal packet mode, and be grouped from all possible transmitting terminal
Packet mode and corresponding transmitting terminal when maximization network effectiveness is selected to connect ratio and transmitting terminal with receiving end in mode
Power.It can be seen from figure 7 that although the disturbance restraining method based on interference figure is only from a small number of transmitting terminal packet modes to be selected
In selected, but may be implemented and performance similar in complicated enumerative technique.Meanwhile the disturbance restraining method based on interference figure
Performance is better than the fixed pedestal method of two kinds of transmitting terminal packet modes.
Fig. 8 is the schematic diagram for the electronic equipment that a preferred embodiment of the present invention provides.
The electronic equipment 8 includes: memory 81, at least one processor 82 and is stored in the memory 81 simultaneously
The computer program 83 that can be run at least one described processor 82.At least one described processor 82 executes the calculating
The step in above method embodiment is realized when machine program 83.Alternatively, at least one described processor 82 executes the computer
The function of each module in above-mentioned apparatus embodiment is realized when program 83.
Illustratively, the computer program 83 can be divided into one or more module/units, it is one or
Multiple module/units are stored in the memory 81, and are executed by least one described processor 82, to complete this hair
It is bright.One or more of module/units can be the series of computation machine program instruction section that can complete specific function, this refers to
Enable section for describing implementation procedure of the computer program 83 in the electronic equipment 8.For example, the computer program 83
Module shown in Fig. 2 can be divided into, each module concrete function is referring to the description to Fig. 2.
The electronic equipment 8 can be any electronic product, for example, personal computer, tablet computer, intelligent hand
Machine, personal digital assistant (Personal Digital Assistant, PDA) etc..It will be understood by those skilled in the art that described
Schematic diagram 8 is only the example of electronic equipment 8, does not constitute the restriction to electronic equipment 8, may include more more or less than illustrating
Component, perhaps combine certain components or different components, such as the electronic equipment 8 can also be set including input and output
Standby, network access equipment, bus etc..
At least one described processor 82 can be central processing unit (Central Processing Unit, CPU),
It can also be other general processors, digital signal processor (Digital Signal Processor, DSP), dedicated integrated
Circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..The processor 82 can be microprocessor or the processor 82 is also possible to any conventional processing
Device etc., the processor 82 are the control centres of the electronic equipment 8, utilize various interfaces and the entire electronic equipment of connection
8 various pieces.
The memory 81 can be used for storing the computer program 83 and/or module/unit, and the processor 82 passes through
Operation executes the computer program and/or module/unit being stored in the memory 81, and calls and be stored in memory
Data in 81 realize the various functions of the electronic equipment 8.The memory 81 can mainly include storing program area and storage
Data field, wherein storing program area can application program needed for storage program area, at least one function (for example sound plays
Function, image player function etc.) etc.；Storage data area, which can be stored, uses created data (such as sound according to electronic equipment 8
Frequency evidence, phone directory etc.) etc..In addition, memory 81 may include high-speed random access memory, it can also include non-volatile
Memory, such as hard disk, memory, plug-in type hard disk, intelligent memory card (Smart Media Card, SMC), secure digital
(Secure Digital, SD) card, flash card (Flash Card), at least one disk memory, flush memory device or other
Volatile solid-state part.
If the integrated module/unit of the electronic equipment 8 is realized in the form of SFU software functional unit and as independent
Product when selling or using, can store in a computer readable storage medium.Based on this understanding, the present invention is real
All or part of the process in existing above-described embodiment method, can also instruct relevant hardware come complete by computer program
At the computer program can be stored in a computer readable storage medium, which is being executed by processor
When, it can be achieved that the step of above-mentioned each embodiment of the method.Wherein, the computer program includes computer program code, described
Computer program code can be source code form, object identification code form, executable file or certain intermediate forms etc..The meter
Calculation machine readable medium may include: can carry the computer program code any entity or device, recording medium, USB flash disk,
Mobile hard disk, magnetic disk, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory
Device (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It needs to illustrate
It is that the content that the computer-readable medium includes can be fitted according to the requirement made laws in jurisdiction with patent practice
When increase and decrease, such as in certain jurisdictions, according to legislation and patent practice, computer-readable medium does not include electric carrier wave letter
Number and telecommunication signal.
In several embodiments provided by the present invention, it should be understood that disclosed electronic equipment, device and method,
It may be implemented in other ways.For example, Installation practice described above is only illustrative, for example, the unit
Division, only a kind of logical function partition, there may be another division manner in actual implementation.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in same treatment unit
It is that each unit physically exists alone, can also be integrated in same unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of hardware adds software function module.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included in the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.This
Outside, it is clear that one word of " comprising " is not excluded for other units or, odd number is not excluded for plural number.The multiple units stated in device claim
Or device can also be implemented through software or hardware by a unit or device.
Finally it should be noted that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although reference
Preferred embodiment describes the invention in detail, those skilled in the art should understand that, it can be to of the invention
Technical solution is modified or equivalent replacement, without departing from the spirit of the technical scheme of the invention range.
Claims (10)
1. a kind of link interference suppressing method is applied to visible light communication network, which is characterized in that the described method includes:
Transmitting terminal interference figure is generated according to the channel information between transmitting terminal and receiving end, the transmitting terminal interference figure includes several
Company's side right value between node and node, each one transmitting terminal of node on behalf, several all transmitting terminals of node on behalf are described
Company's side right value between node represents the interference strength between transmitting terminal；
Several transmitting terminal packet modes to be selected are determined according to the transmitting terminal interference figure, wherein each transmitting terminal to be selected
Packet mode includes that the transmitting terminal is divided into multiple groupings, and the transmitting terminal of different grouping sends letter in mutually orthogonal mode
Breath；
The power of connection ratio and transmitting terminal for each transmitting terminal packet mode optimization transmitting terminal and receiving end to be selected
To maximize the network utility under each transmitting terminal packet mode to be selected；
The connection ratio of transmitting terminal packet mode to be selected and corresponding transmitting terminal and receiving end when determining network utility maximum
And the power of transmitting terminal is AF panel strategy；
Wherein, the transmitting terminal includes light source, and for sending optical signal, the receiving end is for receiving optical signal.
2. link interference suppressing method as described in claim 1, which is characterized in that described according between transmitting terminal and receiving end
Channel information generate transmitting terminal interference figure include:
According to the channel information between transmitting terminal and receiving end, the doing for each receiving end between every two transmitting terminal is determined
Disturb intensity；
Determine that company's side right value between transmitting terminal interference figure interior joint is directed to each reception between corresponding two transmitting terminals
The average value of the interference strength at end.
3. link interference suppressing method as described in claim 1, which is characterized in that described true according to the transmitting terminal interference figure
Determining transmitting terminal packet mode to be selected includes:
Select K node as the central node of initial packet, other sections from all nodes in the transmitting terminal interference figure
Point is to packet node；
Selection one is to packet node；
Determine select it is described to packet node and each grouping company's side right value for described in selection to packet node and institute
State the maximum value of company's side right value between grouping interior joint；
Connect the smallest grouping of side right value to packet node with described for being added described in selection to packet node；
Other are waited for that corresponding grouping is added in packet node, wherein if only will currently after corresponding grouping is added in packet node,
It will be described next wait be grouped section according to next minimum even side right value in packet node and company's side right value of each grouping
Point, which is added, next connects the smallest grouping of side right value to packet node with described；
The central node for redefining the grouping is to connect the smallest node of side right value mean value with other nodes in group, is redefined
Other nodes are to packet node；
Iteration is until meet preset condition.
4. link interference suppressing method as claimed in claim 3, it is characterised in that: the preset condition is to reach iteration to preset
Number or grouping no longer change.
5. link interference suppressing method as described in claim 1, which is characterized in that described for each transmitting terminal to be selected point
The power of the connection ratio and transmitting terminal of group method optimizing transmitting terminal and receiving end is to maximize each transmitting terminal grouping to be selected
Network utility under mode includes:
Optimize the connection of transmitting terminal and receiving end under the power of given transmitting terminal for each transmitting terminal packet mode to be selected
Ratio；
Optimize transmitting terminal under the connection ratio of given transmitting terminal and receiving end for corresponding transmitting terminal packet mode to be selected
Power；
Iteration is until result restrains.
6. link interference suppressing method as claimed in claim 5, it is characterised in that:
Transmitting terminal and the receiving end of optimizing under the power of given transmitting terminal for each transmitting terminal packet mode to be selected
Connection ratio is convex optimization problem.
7. link interference suppressing method as claimed in claim 5, which is characterized in that described in given transmitting terminal and receiving end
The power of optimization transmitting terminal includes: under connection ratio
Optimize the power of transmitting terminal under the connection ratio of given transmitting terminal and receiving end using convex row approximate algorithm.
8. a kind of link interference inhibits device, it is applied to visible light communication network, which is characterized in that described device includes:
Interference figure generation module, it is described for generating transmitting terminal interference figure according to the channel information between transmitting terminal and receiving end
Transmitting terminal interference figure includes company's side right value between several nodes and node, each one transmitting terminal of node on behalf, several sections
Point represents all transmitting terminals, and company's side right value between the node represents the interference strength between transmitting terminal；
Packet mode determining module, for determining several transmitting terminal packet modes to be selected according to the transmitting terminal interference figure,
Wherein, each transmitting terminal packet mode to be selected includes that the transmitting terminal is divided into multiple groupings, the transmitting terminal of different grouping with
Mutually orthogonal mode carries out information transmission；
Network utility maximizes module, for the company for each transmitting terminal packet mode optimization transmitting terminal and receiving end to be selected
The power of ratio and transmitting terminal is connect to maximize the network utility under each transmitting terminal packet mode to be selected；
AF panel strategy determining module, for transmitting terminal packet mode to be selected when determining network utility maximum and corresponding
The power of the connection ratio and transmitting terminal of transmitting terminal and receiving end is AF panel strategy；
Wherein, the transmitting terminal includes light source, and for sending optical signal, the receiving end is for receiving optical signal.
9. a kind of electronic equipment, which is characterized in that the electronic equipment includes processor and memory, and the processor is for holding
Link interference as claimed in any of claims 1 to 7 in one of claims is realized when at least one instruction stored in the row memory
Suppressing method.
10. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has at least one
Instruction, at least one described instruction are executed by processor to realize link interference as claimed in any of claims 1 to 7 in one of claims
Suppressing method.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113595896A (en) * | 2021-08-05 | 2021-11-02 | 河南大学 | Multi-route communication method of mixed data center network based on VLC link |
| CN114556808A (en) * | 2019-08-09 | 2022-05-27 | 昕诺飞控股有限公司 | Interference suppression for optical wireless networks |
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| CN102224692A (en) * | 2008-11-25 | 2011-10-19 | 三星电子株式会社 | Visible ray communication system and method for transmitting signal |
| CN103548288A (en) * | 2012-04-03 | 2014-01-29 | 松下电器产业株式会社 | Visible light reception device and visible light reception method |
| US20150043006A1 (en) * | 2013-08-06 | 2015-02-12 | Zygo Corporation | Interferometry employing refractive index dispersion |
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| CN102224692A (en) * | 2008-11-25 | 2011-10-19 | 三星电子株式会社 | Visible ray communication system and method for transmitting signal |
| CN103548288A (en) * | 2012-04-03 | 2014-01-29 | 松下电器产业株式会社 | Visible light reception device and visible light reception method |
| US20150043006A1 (en) * | 2013-08-06 | 2015-02-12 | Zygo Corporation | Interferometry employing refractive index dispersion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114556808A (en) * | 2019-08-09 | 2022-05-27 | 昕诺飞控股有限公司 | Interference suppression for optical wireless networks |
| CN113595896A (en) * | 2021-08-05 | 2021-11-02 | 河南大学 | Multi-route communication method of mixed data center network based on VLC link |
| CN113595896B (en) * | 2021-08-05 | 2022-04-05 | 河南大学 | Multi-route communication method of mixed data center network based on VLC link |
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