CN105187111B - Signal acquiring method, device based on visible light communication and visible light communication system - Google Patents
Signal acquiring method, device based on visible light communication and visible light communication system Download PDFInfo
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- CN105187111B CN105187111B CN201510631279.8A CN201510631279A CN105187111B CN 105187111 B CN105187111 B CN 105187111B CN 201510631279 A CN201510631279 A CN 201510631279A CN 105187111 B CN105187111 B CN 105187111B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0862—Weighted combining receiver computing weights based on information from the transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
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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
An embodiment of the present invention provides a kind of signal acquiring method, device and visible light communication system based on visible light communication, the specific implementation step of the method include：Receive multiple initial signals, wherein the multiple initial signal be transmitting terminal generate source visible light signal after transmission, by different branch reception be formed by, the source visible light signal includes at least：The source pseudo-random sequence of source predetermined sequence and carrying data, each initial signal include at least：The target pseudo-random sequence of target predetermined sequence and carrying data；According to the target predetermined sequence in each initial signal, the signal-to-noise ratio of every branch is calculated；According to the signal-to-noise ratio for each branch being calculated, processing is merged to the target pseudo-random sequence in the multiple initial signal, obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence.The present embodiment improves the transmission performance of visible light communication system by easily and accurately calculating the signal-to-noise ratio of a plurality of branch.
Description
Technical field
The present invention relates to technical field of visible light communication, more particularly to a kind of signal acquisition side based on visible light communication
Method, device and visible light communication system.
Background technology
Visible light communication technology refers to using the light of visible light wave range as information carrier, without using wire channel such as optical fiber
Transmission medium, and use air as medium to transmit the communication mode of optical signal.LED light is as interior illumination fixture, tool
Have the advantages that service life is long, modulating performance is good, corresponding high sensitivity, transmission power are big.Light as visible light communication system
Source, the rapid proliferation of LED light have pushed the development of visible light communication technology significantly.
Continuous growth due to the use of more and more mobile digital terminals, especially user to Video service demand, makes
It obtains and is becoming tight radio spectrum resources day, and the introducing of visible light communication is a tremendous expansion to communication spectrum.Wherein, it is seen that
Light has the enormous bandwidth (being equivalent to 405THz) of 380-780nm, can alleviate matter as a fire singeing one's eyebrows that radio spectrum resources will exhaust it
It is anxious.Simultaneously, it is seen that optical communication technique can realize illumination and upper Network Communication with the characteristic of High Speed Modulation using LED light, can be with
Realize the intelligent control to the terminals such as household electrical appliance and safety precaution equipment.Further, since visible light communication no electromagnetic pollution,
Therefore there can be wide application scenarios as effective supplement of existing wireless communications, such as：It can be applied to organ, doctor
The radio frequency susceptibles such as institute, Industry Control field, can be used for the fields such as smart home, intelligent transportation.
Fading effect is one of the principal element for influencing visible light communication quality, wherein what is generated by multi-path interference is fast
Decline, dafing depth is up to 30~40dB.In the prior art, space diversity receiver combining technology is a kind of common in short wave communication
Technology, with for reducing the influence of rapid fading in short wave communication.Wherein, so-called space diversity receiver combining technology is shortwave
A kind of technology commonly influenced for reducing rapid fading, i.e., receive mutual correlation very little on several branch roads in communication
The signal for being loaded with same message, each tributary signal is merged again by folding and is exported, to being dropped significantly in receiving terminal
The low influence of rapid fading, improves the reliability of transmission.Specifically, common space diversity receiver combining method includes：Most
Big ratio merges, equal gain combining, selection combination etc..
Space diversity receiver combining method needs the signal-to-noise ratio for calculating each branch when obtaining merging signal.Currently, in nothing
In line communication, common signal-noise ratio computation method includes：Method based on maximal possibility estimation, it is anti-using training sequence or judgement
Sequence is presented to construct likelihood function；Or the method based on matrix, come using the relationship between 2, the 4 rank matrixes newly made with noise
Estimate signal-to-noise ratio.However, these methods require that system has been achieved with clock synchronization and carrier synchronization, but these conditions are to visible
Optical communication system implements more difficult.
Invention content
The embodiment of the present invention is designed to provide a kind of signal acquiring method based on visible light communication, device and visible
Optical communication system improves visible light communication system to realize the convenient of signal-to-noise ratio ratio in visible light communication system and accurately calculate
The transmission performance of system.Specific technical solution is as follows：
In a first aspect, the present invention provides a kind of signal acquiring method based on visible light communication, it is applied to receiving terminal, institute
The method of stating includes：
Receive multiple initial signals, wherein the multiple initial signal is that the source visible light signal that transmitting terminal generates passes through
After transmission, it is formed by by different branch reception, the source visible light signal includes at least：Source predetermined sequence and carrying number
According to source pseudo-random sequence, each initial signal includes at least：The target pseudorandom sequence of target predetermined sequence and carrying data
Row, the target predetermined sequence is corresponding with the source predetermined sequence, the target pseudo-random sequence and the source pseudo-random sequence
It is corresponding；
According to the target predetermined sequence in each initial signal, the signal-to-noise ratio of corresponding every branch is calculated；
According to the signal-to-noise ratio for each branch being calculated, to the target pseudo-random sequence in the multiple initial signal
Processing is merged, the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence is obtained.
Further, the target predetermined sequence includes：First ray and the second sequence, described in the First ray corresponds to
1 part of digital signal of source predetermined sequence, second sequence pair answer the digital signaling zero part of the source predetermined sequence；
Target predetermined sequence in each initial signal of basis, the signal-to-noise ratio for calculating corresponding every branch include：
First ray in the initial signal received according to each branch calculates the corresponding signal of each branch and the work(of noise
The average value of the sum of rate；
The second sequence in the initial signal received according to each branch calculates the noise power of corresponding each branch；
According to the average value of the sum of the power of the signal of each branch and noise, and the accordingly noise work(of each branch
Rate calculates the signal-to-noise ratio of each branch.
Further, the First ray in the initial signal received according to each branch calculates corresponding each branch
The average value of the sum of the power of signal and noise includes：
In the initial signal that each branch receives each bit signal of First ray be respective branch signal with make an uproar
The sum of amplitude of sound, according to the amplitude of the signal and noise of the length of First ray in each initial signal and corresponding each branch it
With calculate the average value of the sum of the signal of each branch and the amplitude of noise；
The average value of the sum of amplitude according to the signal of each branch and noise calculates every branch using following formula
Signal and noise the sum of power average value：
Wherein, the SrFor the average value of the sum of the power of the signal and noise of any branch r, the MrFor branch described in this
The average value of the sum of the signal of road r and the amplitude of noise, the Rv(λ) is Voltage Spectroscopy responsiveness, for determining wavelength X,
The Rv(λ) is constant.
Further, the second sequence in the initial signal received according to each branch calculates corresponding each branch
Noise power includes：
Each bit signal of the second sequence is the width of the noise of respective branch in the initial signal that each branch receives
Degree, the noise power of every branch is calculated using following formula：
Wherein, the DrFor the noise power of any branch r, the n is the second sequence in the signal that the branch r is transmitted
The length of row, the xr1,xr2,xr3...,xrnEach bit signal width of second sequence in the signal transmitted for branch r described in this
Value；The TrFor the average value of each bit signal amplitude of the second sequence of branch r described in this；
The signal-to-noise ratio of each branch is calculated using following formula：
Wherein, the SNRrFor the signal-to-noise ratio of any branch r, the SrFor the power of the signal of branch r and noise described in this
The sum of average value, the DrFor the noise power of branch r described in this.
Further, the signal-to-noise ratio according to each branch being calculated, in the multiple initial signal
Target pseudo-random sequence merges processing, obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence and includes：
According to the signal-to-noise ratio for each branch being calculated, the signal-to-noise ratio ratio of each branch is calculated；
The signal-to-noise ratio ratio of each branch is determined as to the weights of corresponding each branch；
According to the weights of each branch, merged in the way of default merging from the mesh in the initial signal that every branch receives
Pseudo-random sequence is marked, obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence, the default merging mode is
Following one：Equal gain combining, maximum-ratio combing and selection combination.
Further, the target predetermined sequence in each initial signal of the basis calculates corresponding each branch
Before signal-to-noise ratio, further include：
Sliding mean filter processing is carried out to each initial signal, to filter out the height in each initial signal
Frequency noise.
Second aspect, the present invention provides a kind of signal acquisition device based on visible light communication are applied to receiving terminal, institute
Stating device includes：
Receiving module, for receiving multiple initial signals, wherein the multiple initial signal is that the source that transmitting terminal generates can
Light-exposed signal is formed by, the source visible light signal is included at least after transmission by different branch reception：Source is default
The source pseudo-random sequence of sequence and carrying data, each initial signal include at least：Target predetermined sequence and carrying data
Target pseudo-random sequence, the target predetermined sequence is corresponding with the source predetermined sequence, the target pseudo-random sequence with it is described
Source pseudo-random sequence corresponds to；
Computing module, for according to the target predetermined sequence in each initial signal, calculating the letter of corresponding every branch
It makes an uproar ratio；
Execution module, for the signal-to-noise ratio according to each branch being calculated, in the multiple initial signal
Target pseudo-random sequence merges processing, obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence.
Further, the target predetermined sequence includes：First ray and the second sequence, described in the First ray corresponds to
1 part of digital signal of source predetermined sequence, second sequence pair answer the digital signaling zero part of the source predetermined sequence；
The computing module is specifically used for：
First ray in the initial signal received according to each branch calculates the corresponding signal of each branch and the work(of noise
The average value of the sum of rate；
The second sequence in the initial signal received according to each branch calculates the noise power of corresponding each branch；
According to the average value of the sum of the power of the signal of each branch and noise, and the accordingly noise work(of each branch
Rate calculates the signal-to-noise ratio of each branch.
Further, described device further includes：
Mean filter processing module, for carrying out sliding mean filter processing to each initial signal, to filter out
High-frequency noise in each initial signal.
The third aspect, the present invention provides a kind of visible light communication system, the system comprises：Transmitting terminal and receiving terminal；
The transmitting terminal is used for generating source pseudo-random sequence, and the source pseudo-random sequence of generation is merged life with source predetermined sequence
At source visible light signal；Send the source visible light signal；
The receiving terminal is for receiving multiple initial signals, wherein the multiple initial signal is the source that transmitting terminal generates
Visible light signal is formed by, the source visible light signal is included at least after transmission by different branch reception：Source is pre-
If the source pseudo-random sequence of sequence and carrying data, each initial signal include at least：Target predetermined sequence and carrying data
Target pseudo-random sequence, the target predetermined sequence is corresponding with the source predetermined sequence, the target pseudo-random sequence and institute
Source pseudo-random sequence is stated to correspond to；According to the target predetermined sequence in each initial signal, the noise of corresponding every branch is calculated
Than；According to the signal-to-noise ratio for each branch being calculated, the target pseudo-random sequence in the multiple initial signal is carried out
Merging treatment obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence.
Signal acquiring method, device and visible light communication system provided in an embodiment of the present invention based on visible light communication,
It can be by being added predetermined sequence in each frame data that transmitting terminal is sent, receiving terminal is being received through each branch transmission
After signal, the real-time signal-to-noise ratio of each branch can be calculated according to the predetermined sequence in signal, further according to each item branch
The real-time signal-to-noise ratio on road merges processing to the signal of each branch received, is easily and accurately eventually received
Signal can improve the transmission performance of visible light communication system.
Description of the drawings
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 technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 shows the stream of one embodiment according to the signal acquiring method provided by the invention based on visible light communication
Cheng Tu；
Fig. 2 shows according to another embodiment of the signal acquiring method provided by the invention based on visible light communication
Flow chart；
Fig. 3 shows the knot of one embodiment of the signal acquisition device based on visible light communication according to provided by the invention
Structure schematic diagram；
Fig. 4 shows the structural schematic diagram of one embodiment according to visible light communication system provided by the invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In visible light communication system, the optical signal that transmitting terminal is sent can be transmitted by air, and receiving terminal is to light
Signal is received, and realizes the transmission of signal.Fading effect is one of the principal element for influencing visible light communication quality, especially
The rapid fading generated by multi-path interference.In order to reduce influence of the rapid fading to visible light communication quality, multiple can be passed through
Road is transmitted same signal, and multiple signals are merged and exported after the signal for receiving multiple branch transmission by receiving terminal, to
The influence of rapid fading can be reduced.
Receiving terminal needs the signal-to-noise ratio ratio for calculating each branch in the signal after being merged.However, existing calculating
The method of signal-to-noise ratio cannot facilitate, be precisely calculated the signal-to-noise ratio of each branch, to influence the transporting of visible light communication system
Energy.
Signal acquiring method provided in an embodiment of the present invention can be applied in visible light communication system.It is sent in transmitting terminal
When signal, predetermined sequence can be added in each frame data, then signal is transmitted by a plurality of branch, receiving terminal is received
To after each branch received signal, the signal-to-noise ratio of corresponding each branch can be calculated using the predetermined sequence in each signal.Tool
Body, transmitting terminal may be used LED light emitting device and send out optical signal, may include predetermined sequence and carrying data in optical signal
Pseudo-random sequence.
In order to be precisely calculated the signal-to-noise ratio of each branch, receiving terminal needs to obtain the information and signal for only including noise
With the integrated information of noise.Therefore, predetermined sequence could be provided as including two parts, and a part is digital signal 1, another part
For digital signaling zero.When transmitting terminal sends digital signal 1, luminescent device sends out optical signal, optical signal during propagation with letter
Noise in road is superimposed, and what then the light receiving element of receiving terminal obtained is the sum of signal and noise amplitude；And send number
When word signal 0, luminescent device does not send optical signal, thus the light receiving element of receiving terminal obtain be noise amplitude.
It is a statistics knot it is appreciated that since predetermined sequence is the signal-to-noise ratio for calculating each channel transmission signal
Fruit, therefore, the length of predetermined sequence are bigger, and the signal-to-noise ratio for each channel transmission signal being calculated is more accurate.But default sequence
The length of row, which crosses conference, influences the efficiency of transmission of visible light communication system.Therefore, under normal circumstances, the length of predetermined sequence can be with
It is set smaller than the length of pseudo-random sequence.Specifically, the length of predetermined sequence can be set as the length with pseudo-random sequence
It is related.For example, the ratio of the length of the length and pseudo-random sequence of predetermined sequence may be set in a certain range (such as 0.01-
0.1)。
Alternatively, or in addition, the two-part length for corresponding digital signals 1 and 0 being distinguished in predetermined sequence can be identical,
It can also be different.Under normal circumstances, two parts that corresponding digital signals 1 and 0 are distinguished in predetermined sequence can be set with identical
Length.
By adding predetermined sequence in the signal that transmitting terminal is sent, signal acquiring method provided in an embodiment of the present invention can
Accurately to calculate the real-time signal-to-noise ratio of each branch, so as to improve the accuracy of the signal received, it is logical to improve visible light
The transmission performance of letter system.
Referring to FIG. 1, it illustrates according to one of the signal acquiring method provided by the invention based on visible light communication
The flow chart of embodiment.
As shown in Figure 1, the signal acquiring method provided in this embodiment based on visible light communication, is applied to receiving terminal, it can
To include the following steps：
Step 101, multiple initial signals are received.
In the present embodiment, receiving terminal can receive multiple initial signals.Above-mentioned multiple initial signals are that transmitting terminal generates
Source visible light signal pass through transmission, different branch receive after formed, source visible light signal includes at least：Preset sequence in source
The source pseudo-random sequence of row and carrying data；Each initial signal includes at least：The mesh of target predetermined sequence and carrying data
Mark pseudo-random sequence, target predetermined sequence is source predetermined sequence to be formed by by transmission and after being received by different branch,
Target pseudo-random sequence is source pseudo-random sequence to be formed by by transmission and after being received by different branch.
It, can be by multiple in order to reduce influence of the rapid fading to visible light communication quality in visible light communication system
Branch receives same source visible light signal.Above-mentioned multiple branches can be independent from each other branch.Using multiple mutual
When independent branch receives same source visible light signal, multiple initial signals that receiving terminal receives also have smaller correlation,
Receiving terminal can more correctly recover source visible light signal in this way.
In the present embodiment, transmitting terminal can send out source visible light signal by LED light emitting device.Above-mentioned source visible light letter
Number may include：Frame head, source predetermined sequence and the source pseudo-random sequence for carrying data.Receiving terminal, can when receiving initial signal
To judge that the initial signal should be received or be abandoned using frame head.
It is appreciated that after receiving terminal receives each initial signal, can optical filtering processing be carried out to each initial signal first, filtered out
Other smooth ingredients in each initial signal received in addition to a blue, and then increase the three dB bandwidth of visible light communication system.Also
It can further be converted by opto-electronic conversion, analog signal/digital signal, initial signal is converted into digital signal, with to first
The processing such as beginning signal carries out preamble detecting, signal merges.
Step 102, according to the target predetermined sequence in each initial signal, the signal-to-noise ratio of corresponding every branch is calculated.
In the present embodiment, corresponding every branch can be calculated according to the target predetermined sequence in each initial signal
Signal-to-noise ratio.Above-mentioned target predetermined sequence includes：First ray and the second sequence, the number of First ray corresponding source predetermined sequence
1 part of signal, the digital signaling zero part of the second sequence corresponding source predetermined sequence.
It, can be according to the following steps according to the target in each initial signal in an optional realization method of the present embodiment
Predetermined sequence calculates the signal-to-noise ratio of corresponding every branch：First ray in the initial signal received according to each branch, meter
Calculate the average value of the sum of the signal of corresponding each branch and the power of noise；Second in the initial signal received according to each branch
Sequence calculates the noise power of corresponding each branch；According to the average value of the sum of the power of the signal of each branch and noise, Yi Jixiang
The noise power for answering each branch calculates the signal-to-noise ratio of each branch.
Specifically, each bit signal of First ray is the letter of respective branch in the initial signal that each branch receives
Number the sum of with the amplitude of noise, according to the length of First ray in each initial signal and the corresponding signal of each branch and the width of noise
The sum of degree, calculates the average value of the sum of the signal of each branch and the amplitude of noise；According to the amplitude of the signal of each branch and noise
The sum of average value, calculate the average value of the sum of the signal of corresponding each branch and power of noise；Each branch receives initial
Each bit signal of the second sequence is the amplitude of the noise of respective branch in signal, according to the second sequence in each initial signal
Calculate the noise power of corresponding each branch；According to the average value of the sum of the power of the signal of each branch and noise, and it is corresponding each
The noise power of branch calculates the signal-to-noise ratio of each branch.
For example, the source predetermined sequence that transmitting terminal is sent can be 1000bit (bit), preceding 500bit is digital signal 1,
500bit is digital signaling zero afterwards.Preceding 500bit is signal and noise in the either objective predetermined sequence that then receiving terminal receives
The sum of amplitude, rear 500bit are the noise amplitude of the branch.Preceding 500bit data in target predetermined sequence are averaging, are obtained
To the average value of the sum of the amplitude of the signal and noise of the branch.
The common electrooptical device of receiving terminal has photodiode (PIN) and photomultiplier (PMT), in certain light
In strong range, the amplitude that these devices receive optical signal is directly proportional to luminous power, i.e.,：
Wherein Rv(λ) is Voltage Spectroscopy responsiveness, and for specific wavelength, the Voltage Spectroscopy responsiveness of luminescent device is one
Definite value, V (λ) are the voltage for receiving optical signal, and P (λ) is to receive the luminous power of optical signal, therefore in certain luminous intensity unit,
The amplitude that electrooptical device receives optical signal is directly proportional to luminous power, and normal illumination and experiment are in this range of light intensity
It is interior.
So after the average value of the sum of the amplitude of signal and noise for obtaining each branch, following formula meter can be utilized
Calculate the average value of the sum of the signal of any branch r and the power of noise：
Wherein, SrFor the average value of the sum of the power of the signal and noise of any bar branch r, MrFor branch r signal with
The average value of the sum of the amplitude of noise, Rv(λ) is Voltage Spectroscopy responsiveness, for determining wavelength X, Rv(λ) is constant.
For the noise amplitude of the branch r of rear 500bit, since optic communication is used for indoor communications, room light noise amplitude
Normal Distribution, so the variance of noise amplitude is noise power.Therefore, after can be to receiving target predetermined sequence
500bit is calculated, and amplitude variance D is obtainedr, that is, noise power.
The average value T of 500bit after can calculating firstr：
Then according to the average value T of the amplitude of the noiser, calculate the noise power of branch r：
Obtain the average value S of the sum of the signal of branch r and the power of noiserAnd the noise power D of branch rrAfterwards, may be used
The signal-to-noise ratio of branch r is calculated with following formula：
Other branches use identical method, and the signal-to-noise ratio for obtaining all branches successively is SNR1、SNR2、SNR3……
SNRn.And then it can realize various Diversity Reception modes according to the ratio.
Step 103, according to the signal-to-noise ratio for each branch being calculated, to the target pseudorandom in multiple initial signals
Sequence merges processing, obtains the receiving terminal signal to be utilized corresponding to the pseudo-random sequence of source.
After obtaining the signal-to-noise ratio of each branch, receiving terminal can carry out the target pseudo-random sequence in multiple initial signals
Merging treatment obtains the receiving terminal signal to be utilized corresponding to the pseudo-random sequence of source.
Specifically, the signal-to-noise ratio ratio of each branch can be calculated according to the signal-to-noise ratio for each branch being calculated,
The signal-to-noise ratio ratio of every branch is determined as to the weights of corresponding each branch later, then according to the weights of each branch, using pre-
If the mode of merging merges from the target pseudo-random sequence in the initial signal that every branch receives, source pseudo-random sequence institute is obtained
Corresponding receiving terminal signal to be utilized.For example, existing any merging mode may be used by the mesh in each initial signal
Mark pseudo-random sequence merges, e.g., equal gain combining, maximum-ratio combing and selection combination etc..
Signal acquiring method provided in this embodiment based on visible light communication, can be each by being sent in transmitting terminal
Predetermined sequence is added in frame data, receiving terminal, can be according to pre- in signal after receiving the signal transmitted through each branch
If the real-time signal-to-noise ratio ratio of each branch is calculated in sequence, further docked according to the real-time signal-to-noise ratio ratio of each branch
The signal of each branch received merges processing, and the signal easily and accurately eventually received can improve visible
The transmission performance of optical communication system.
Referring to FIG. 2, it illustrates according to the another of the signal acquiring method provided by the invention based on visible light communication
The flow chart of a embodiment.
As shown in Fig. 2, the signal acquiring method provided in this embodiment based on visible light communication, is applied to receiving terminal, it can
To include the following steps：
Step 201, multiple initial signals are received.
Step 201 in the present embodiment and the step 101 in embodiment corresponding to earlier figures 1 are essentially identical, herein no longer
It repeats.
Step 202, sliding mean filter processing is carried out to each initial signal, to filter out the height in each initial signal
Frequency noise.
In the present embodiment, after receiving terminal receives multiple initial signals, each initial signal can be carried out first
Slide mean filter processing.It specifically, can be by each initial signal acquisition of storage as a result, calculating being averaged for each sampled point
Value, is then handled each initial signal using the means of Digital Signal Processing, to filter out the high frequency in each initial signal
Noise.
Step 203, according to the target predetermined sequence in each initial signal, the signal-to-noise ratio of corresponding every branch is calculated.
Step 204, according to the signal-to-noise ratio for each branch being calculated, to the target pseudorandom in multiple initial signals
Sequence merges processing, obtains the receiving terminal signal to be utilized corresponding to the pseudo-random sequence of source.
Step 203-204 in the present embodiment and the step 102-103 in embodiment corresponding to earlier figures 1 are essentially identical,
Details are not described herein.
Signal acquiring method provided in this embodiment based on visible light communication, receiving terminal are receiving multiple initial signals
Afterwards, can sliding mean filter processing be carried out to each initial signal first, to filter out the high-frequency noise in each initial signal,
The accuracy that the signal received can be improved improves the transmission performance of visible light communication system.
Referring to FIG. 3, it illustrates according to one of the signal acquisition device provided by the present application based on visible light communication
The structural schematic diagram of embodiment.
As shown in figure 3, the signal acquisition device provided in this embodiment based on visible light communication may include：Receiving module
310, computing module 320 and execution module 330.
Receiving module 310 is for receiving multiple initial signals, wherein multiple initial signals are that the source that transmitting terminal generates is visible
Optical signal is formed by, source visible light signal is included at least after transmission by different branch reception：Source predetermined sequence and
The source pseudo-random sequence of data is carried, each initial signal includes at least：The target of target predetermined sequence and carrying data is pseudo-
Random sequence, target predetermined sequence is corresponding with source predetermined sequence, and target pseudo-random sequence is corresponding with source pseudo-random sequence；
Computing module 320 is used to, according to the target predetermined sequence in each initial signal, calculate corresponding every branch
Signal-to-noise ratio；
Execution module 330 is used for the signal-to-noise ratio according to each branch being calculated, to the mesh in multiple initial signals
Mark pseudo-random sequence merges processing, obtains the receiving terminal signal to be utilized corresponding to the pseudo-random sequence of source.
In an optional realization method of the present embodiment, target predetermined sequence includes：First ray and the second sequence, the
1 part of digital signal of one sequence corresponding source predetermined sequence, the digital signaling zero part of the second sequence corresponding source predetermined sequence；
Computing module 320 is specifically used for：
First ray in the initial signal received according to each branch calculates the corresponding signal of each branch and the work(of noise
The average value of the sum of rate；
The second sequence in the initial signal received according to each branch calculates the noise power of corresponding each branch；
According to the average value of the sum of the power of the signal of each branch and noise, and the accordingly noise power of each branch, meter
Calculate the signal-to-noise ratio of each branch.
In another optional realization method of the present embodiment, the signal provided in this embodiment based on visible light communication obtains
The device is taken to further include：
Mean filter processing module, it is each to filter out for carrying out sliding mean filter processing to each initial signal
High-frequency noise in initial signal.
Signal acquisition device provided in this embodiment based on visible light communication, can be each by being sent in transmitting terminal
Predetermined sequence is added in frame data, receiving terminal, can be first to each initial letter after receiving the signal transmitted through each branch
Sliding mean filter processing number is carried out, to filter out the high-frequency noise in each initial signal, then according to default in signal
The real-time signal-to-noise ratio of each branch is calculated in sequence, further according to the real-time signal-to-noise ratio of each branch to each item for receiving
The signal of branch merges processing, and the signal easily and accurately eventually received can improve visible light communication system
Transmission performance.
Referring to FIG. 4, it illustrates the structures of one embodiment according to visible light communication system provided by the present application to show
It is intended to.
As shown in figure 4, visible light communication system provided in this embodiment may include：Transmitting terminal 410 and receiving terminal 420.
Transmitting terminal 410 is used for generating source pseudo-random sequence, and the source pseudo-random sequence of generation is merged life with source predetermined sequence
At source visible light signal；Transmission source visible light signal；
Receiving terminal 420 is for receiving multiple initial signals, wherein multiple initial signals are the source visible lights that transmitting terminal generates
Signal is formed by, source visible light signal is included at least after transmission by different branch reception：It source predetermined sequence and holds
The source pseudo-random sequence of data is carried, each initial signal includes at least：Target predetermined sequence and carrying data target puppet with
Machine sequence, target predetermined sequence is corresponding with source predetermined sequence, and target pseudo-random sequence is corresponding with source pseudo-random sequence；According to each
Target predetermined sequence in initial signal calculates the signal-to-noise ratio of corresponding every branch；According to each branch being calculated
Signal-to-noise ratio, processing is merged to the target pseudo-random sequence in multiple initial signals, is obtained corresponding to the pseudo-random sequence of source
Receiving terminal signal to be utilized.
Visible light communication system provided in this embodiment, can be by being added in each frame data that transmitting terminal is sent
Predetermined sequence, receiving terminal can be calculated after receiving the signal transmitted through each branch according to the predetermined sequence in signal
The real-time signal-to-noise ratio of each branch, further according to the real-time signal-to-noise ratio of each branch to the signal of each branch received into
Row merging treatment, the signal easily and accurately eventually received can improve the transmission performance of visible light communication system.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including element.
Each embodiment in this specification is all made of relevant mode and describes, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality
For applying example, since it is substantially similar to the method embodiment, so description is fairly simple, related place is referring to embodiment of the method
Part explanation.
The above is merely preferred embodiments of the present invention, it is not intended to limit the scope of the present invention.It is all in this hair
Any modification, equivalent replacement, improvement and so within bright spirit and principle, are included within the scope of protection of the present invention.
Claims (8)
1. a kind of signal acquiring method based on visible light communication, which is characterized in that it is applied to receiving terminal, the method includes：
Receive multiple initial signals, wherein the multiple initial signal is that the source visible light signal that transmitting terminal generates passes through channel
After transmission, it is formed by by different branch reception, the source visible light signal includes at least：Source predetermined sequence and carrying data
Source pseudo-random sequence, each initial signal include at least：The target pseudo-random sequence of target predetermined sequence and carrying data, institute
It is corresponding with the source predetermined sequence to state target predetermined sequence, the target pseudo-random sequence is corresponding with the source pseudo-random sequence；
According to the target predetermined sequence in each initial signal, the signal-to-noise ratio of corresponding every branch is calculated；
According to the signal-to-noise ratio for each branch being calculated, the target pseudo-random sequence in the multiple initial signal is carried out
Merging treatment obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence；
Wherein, the target predetermined sequence includes：First ray and the second sequence, the First ray correspond to the source and preset sequence
1 part of digital signal of row, second sequence pair answer the digital signaling zero part of the source predetermined sequence；
Target predetermined sequence in each initial signal of basis, the signal-to-noise ratio for calculating corresponding every branch include：
First ray in the initial signal received according to each branch, calculate corresponding each branch signal and noise power it
The average value of sum；
The second sequence in the initial signal received according to each branch calculates the noise power of corresponding each branch；
According to the average value of the sum of the power of the signal of each branch and noise, and the accordingly noise power of each branch, meter
Calculate the signal-to-noise ratio of each branch.
2. according to the method described in claim 1, it is characterized in that, in the initial signal received according to each branch
One sequence, the average value for calculating the sum of the signal of corresponding each branch and the power of noise include：
Each bit signal of First ray is the signal and noise of respective branch in the initial signal that each branch receives
The sum of amplitude, according to the length of First ray in each initial signal and the corresponding signal of each branch and the sum of the amplitude of noise, meter
Calculate the average value of the sum of the signal of each branch and the amplitude of noise；
The average value of the sum of amplitude according to the signal of each branch and noise, the letter of every branch is calculated using following formula
Average value number with the sum of the power of noise：
Wherein, the SrFor the average value of the sum of the power of the signal and noise of any branch r, the MrFor branch r described in this
The average value of the sum of the amplitude of signal and noise, the Rv(λ) is Voltage Spectroscopy responsiveness, for determining wavelength X, the Rv
(λ) is constant.
3. according to the method described in claim 2, it is characterized in that, in the initial signal received according to each branch
Two sequences, the noise power for calculating corresponding each branch include：
Each bit signal of the second sequence is the amplitude of the noise of respective branch in the initial signal that each branch receives, profit
The noise power of every branch is calculated with following formula：
Wherein, the DrFor the noise power of any branch r, the n is the second sequence in the signal that the branch r is transmitted
Length, the xr1,xr2,xr3...,xrnEach bit signal amplitude of second sequence in the signal transmitted for branch r described in this；
The TrFor the average value of each bit signal amplitude of the second sequence of branch r described in this；
The signal-to-noise ratio of each branch is calculated using following formula：
Wherein, the SNRrFor the signal-to-noise ratio of any branch r, the SrFor the sum of the power of the signal of branch r described in this and noise
Average value, the DrFor the noise power of branch r described in this.
4. according to any methods of claim 1-3, which is characterized in that described according to each branch being calculated
Signal-to-noise ratio merges processing to the target pseudo-random sequence in the multiple initial signal, obtains the source pseudo-random sequence
Corresponding receiving terminal signal to be utilized includes：
According to the signal-to-noise ratio for each branch being calculated, the signal-to-noise ratio ratio of each branch is calculated；
The signal-to-noise ratio ratio of each branch is determined as to the weights of corresponding each branch；
According to the weights of each branch, merged in the way of default merging pseudo- from the target in the initial signal that every branch receives
Random sequence, obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence, and the default merging mode is following
One：Equal gain combining, maximum-ratio combing and selection combination.
5. according to any methods of claim 1-3, which is characterized in that the target in each initial signal of the basis
Predetermined sequence, calculating before the signal-to-noise ratio of each branch, further include accordingly：
Sliding mean filter processing is carried out to each initial signal, is made an uproar with filtering out the high frequency in each initial signal
Sound.
6. a kind of signal acquisition device based on visible light communication, which is characterized in that be applied to receiving terminal, described device includes：
Receiving module, for receiving multiple initial signals, wherein the multiple initial signal is the source visible light that transmitting terminal generates
Signal is formed by, the source visible light signal is included at least after transmission by different branch reception：Source predetermined sequence
With the source pseudo-random sequence of carrying data, each initial signal includes at least：The target of target predetermined sequence and carrying data
Pseudo-random sequence, the target predetermined sequence is corresponding with the source predetermined sequence, and the target pseudo-random sequence is pseudo- with the source
Random sequence corresponds to；
Computing module, for according to the target predetermined sequence in each initial signal, calculating the signal-to-noise ratio of corresponding every branch；
Execution module, for the signal-to-noise ratio according to each branch being calculated, to the target in the multiple initial signal
Pseudo-random sequence merges processing, obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence；
Wherein, the target predetermined sequence includes：First ray and the second sequence, the First ray correspond to the source and preset sequence
1 part of digital signal of row, second sequence pair answer the digital signaling zero part of the source predetermined sequence；
The computing module is specifically used for：
First ray in the initial signal received according to each branch, calculate corresponding each branch signal and noise power it
The average value of sum；
The second sequence in the initial signal received according to each branch calculates the noise power of corresponding each branch；
According to the average value of the sum of the power of the signal of each branch and noise, and the accordingly noise power of each branch, meter
Calculate the signal-to-noise ratio of each branch.
7. device according to claim 6, which is characterized in that further include：
Mean filter processing module, it is described to filter out for carrying out sliding mean filter processing to each initial signal
High-frequency noise in each initial signal.
8. a kind of visible light communication system, which is characterized in that the system comprises：Transmitting terminal and receiving terminal；
The transmitting terminal is used for generating source pseudo-random sequence, and the source pseudo-random sequence of generation is merged generation source with source predetermined sequence
Visible light signal；Send the source visible light signal；
The receiving terminal is for receiving multiple initial signals, wherein the multiple initial signal is that the source that transmitting terminal generates is visible
Optical signal is formed by, the source visible light signal is included at least after transmission by different branch reception：Preset sequence in source
The source pseudo-random sequence of row and carrying data, each initial signal include at least：The mesh of target predetermined sequence and carrying data
Pseudo-random sequence is marked, the target predetermined sequence is corresponding with the source predetermined sequence, the target pseudo-random sequence and the source
Pseudo-random sequence corresponds to；According to the target predetermined sequence in each initial signal, the signal-to-noise ratio of corresponding every branch is calculated；Root
According to the signal-to-noise ratio for each branch being calculated, place is merged to the target pseudo-random sequence in the multiple initial signal
Reason, obtains the receiving terminal signal to be utilized corresponding to the source pseudo-random sequence；
Wherein, the target predetermined sequence includes：First ray and the second sequence, the First ray correspond to the source and preset sequence
1 part of digital signal of row, second sequence pair answer the digital signaling zero part of the source predetermined sequence；
The receiving terminal, is specifically used for：
First ray in the initial signal received according to each branch, calculate corresponding each branch signal and noise power it
The average value of sum；The second sequence in the initial signal received according to each branch calculates the noise power of corresponding each branch；Root
According to the average value of the sum of the power of the signal and noise of each branch, and the noise power of corresponding each branch, each is calculated
The signal-to-noise ratio on road.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297115A (en) * | 2013-05-29 | 2013-09-11 | 西安烽火电子科技有限责任公司 | Shortwave WAN (wide area network) diversity reception unit and method |
| CN103475402A (en) * | 2013-07-29 | 2013-12-25 | 北京邮电大学 | Visible-light diversity-reception method and system |
| CN104218990A (en) * | 2014-09-30 | 2014-12-17 | 中国人民解放军信息工程大学 | Visible light communication system and visible light communication method |
| CN104218991A (en) * | 2014-09-30 | 2014-12-17 | 中国人民解放军信息工程大学 | Visible light communication system and visible light communication method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297115A (en) * | 2013-05-29 | 2013-09-11 | 西安烽火电子科技有限责任公司 | Shortwave WAN (wide area network) diversity reception unit and method |
| CN103475402A (en) * | 2013-07-29 | 2013-12-25 | 北京邮电大学 | Visible-light diversity-reception method and system |
| CN104218990A (en) * | 2014-09-30 | 2014-12-17 | 中国人民解放军信息工程大学 | Visible light communication system and visible light communication method |
| CN104218991A (en) * | 2014-09-30 | 2014-12-17 | 中国人民解放军信息工程大学 | Visible light communication system and visible light communication method |
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