CN110048773A - Visible light communication method, signal processing method, system and storage medium - Google Patents
Visible light communication method, signal processing method, system and storage medium Download PDFInfo
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- CN110048773A CN110048773A CN201910199401.7A CN201910199401A CN110048773A CN 110048773 A CN110048773 A CN 110048773A CN 201910199401 A CN201910199401 A CN 201910199401A CN 110048773 A CN110048773 A CN 110048773A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
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Abstract
This application involves a kind of visible light communication method, signal processing method, system and storage mediums, after original signal to be output is mainly carried out linear compression, by the element group being made of light-emitting component while being transmitted, the principle being superimposed using signal in spatial linear, so that the signal of receiving end is the result after the superposition of element group output signal, to revert to the consistent signal of original signal to be output, the linear compression coefficient that linear compression is handled is related to element group group number.In this way, the transmission pressure of one light-emitting component can be shared by several element groups, after linear compression is handled, the signal power of every set of pieces group is substantially reduced, it is not easily accessible between the inelastic region of light-emitting component to transmit signal, the case where reducing distorted signals, and computation complexity is low.
Description
Technical field
This application involves the communications field more particularly to a kind of visible light communication method, signal processing method, system and storages
Medium.
Background technique
In radio frequency (Radio Frequency, RF) communication, orthogonal frequency division multiplexing (Orthogonal Frequency
Division Multiplexing, OFDM) technology confrontation wireless channel multipath fading in terms of have more excellent property
Can, and convenient for combining with multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) technology to mention
The capacity of the system of liter.This same MIMO, OFDM technology can be applied to visible light communication field, to realize that the high speed of data passes
It is defeated.But in visible light communication, the real signal that the signal of transmission must be positive, this is but also OFDM cannot directly be led to by visible light
Letter, and some changes are made, this generates optical ofdm (Optical Orthogonal Frequency
Division Multiplexing, O-OFDM).Classical O-OFDM technology still remains papr (Peak to
Average Power Ratio, PAPR) excessively high problem, this can make transmission believe for the LED that modulation bandwidth is limited
Number by non-linear distortion.
In order to solve the problems, such as that PAPR is excessively high in O-OFDM, some new solutions are suggested.For example, being reflected based on selection
Penetrate pilot tone (Pilot) signal method, dynamic direct current biasing point (the Dynamic Direct of (Selected Mapping, SLM)
Current Bias, DDCB), the carrier wave method of dividision into groups (Subcarrier Grouping, SCG) etc., all there is certain reduction system
The effect of PAPR and non-linear effects.
But the modulation bandwidth of LED is limited, and the top and bottom of the VA characteristic curve in LED as shown in Figure 1
Between there will be inelastic region, nonlinear influence will result in into the signal between inelastic region, to cause distorted signals.
However when PAPR is excessively high, mean that the signal number entered between inelastic region is more to a certain extent, thus by non-linear
A possibility that influence, will be bigger.So the method for eliminating non-linear effects in the past is more from reducing on PAPR to signal
It is handled.Although reducing the PAPR of signal, the reduction of spectrum efficiency and the raising of computation complexity are caused.Frequency spectrum effect
The reduction of rate limits the transmission of data, and higher computation complexity can occupy a large amount of hardware resource, to influence entire logical
The performance of letter system.
Innovation and creation content
The application is intended to provide a kind of visible light communication method, signal processing method, system and storage medium, at least to solve
Certainly one of above-mentioned technical problem.
This application provides the signal processing method in a kind of visible light communication, it is visible that the signal processing method is based on one
Optical communication system, it to include P light-emitting component per the element group that the system comprises K element groups, and K, P are integer, K institute
Element group is stated for completing the output of an original signal S to be output jointly in the form of visible light, which comprises
Linear compression processing is carried out to S, obtains the to be output group of signal s' per the element groupk, k ∈ (0,1 ..., K-
1), wherein the linear compression coefficient of the linear compression processing is related to K, per the light-emitting component in every element group
Cell signal s' to be outputp,kThen meet:
Further, linear compression processing is carried out to S, obtains the to be output group of signal s' per the element groupk, specific to wrap
It includes:
Linear compression processing is carried out to S, obtains the initial group signal s to be output per the element groupk；
To every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, s' is obtainedk,Wherein,For the resulting compressed signal group of non-uniform quantizing compression processing,For compression processing compensating for loss and damage signal group, N round numbers,In s'p,kAccording to skWithIn s'p,k
Difference get.
Further, the non-uniform quantizing compression processing is that mu-law companding is handled or A-law compandor is handled.
Further, to every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, s' is obtainedk, it specifically includes:
To every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, is obtained in per the element group per the hair
The initial cell signal to be output of optical element
To everyPower regulation is carried out using power is made up, obtains s'p,k。
Further, the signal processing method further include:
Using the channel conditions of every light-emitting component, power is made up described in determination.
Further, the linear compression coefficient is K-1。
Present invention also provides a kind of visible light communication method, the visible light communication method includes as at above-mentioned signal
Reason method.
Present invention also provides a kind of visible light communication system, the system comprises: K element group, processor and storage
Device includes P light-emitting component per the element group, and K, P are natural number, and the K element groups are for common in the form of visible light
The output of an original signal S to be output is completed, the memory is stored with the computer program called for the processor, institute
It is executable such as above-mentioned method when calling to state computer program.
Further, the light-emitting component is Light-emitting diode LED unit.
Present invention also provides a kind of computer storage medium, the computer storage medium is stored with computer program,
The computer program is called executable such as above-mentioned method by processor.
The beneficial effects of the present application are as follows:
By providing a kind of visible light communication method, signal processing method, system and storage medium, mainly by original to be output
After beginning signal carries out linear compression, by the element group being made of light-emitting component while being transmitted, using signal in space line
Property superposition principle so that the signal of receiving end be element group output signal superposition after as a result, to revert to defeated
The linear compression coefficient of the consistent signal of original signal out, linear compression processing is related to element group group number.In this way, can be one
The transmission pressure of a light-emitting component is shared by several element groups, after linear compression is handled, the letter of every set of pieces group
The case where number power is substantially reduced, and is not easily accessible between the inelastic region of light-emitting component to transmit signal, and distorted signals is reduced, and
And computation complexity is low.
Detailed description of the invention
Fig. 1 is the VA characteristic curve schematic diagram of the LED of the prior art.
Fig. 2 is the structural schematic diagram of the visible light communication system of the embodiment of the present application one.
Fig. 3 is the structural schematic diagram of the visible light communication system of the embodiment of the present application two.
Fig. 4 is the structural schematic diagram of the visible light communication system of the embodiment of the present application three.
Fig. 5 is CCDF performance comparison figure.
Fig. 6 is the bit error rate performance comparison diagram of non-linear removing method.
Fig. 7 is total system bit error rate performance comparison diagram.
Specific embodiment
Below with reference to some embodiments, the principle of innovation and creation involved by the application is specifically addressed, is enumerated
Embodiment does not represent the protection scope of the application only comprising those embodiments, other are not included in for explaining innovation and creation
Below content, belong to innovation and creation design under embodiment still within the scope of protection of this application.
Embodiment one:
Visible light communication technology is usually flashed using the high speed light and shade of the sendings such as fluorescent lamp or LED being invisible to the naked eye
Signal transmits information, can the wire device of high-speed Internet be connected on lighting device, and insertion attaching plug can make
With.The system being made into using this technology can cover the range that indoor light reaches, and computer does not need electric wire connection, thus has
There is extensive development prospect.
The embodiment of the present application one provides the signal processing method in a kind of visible light communication, which is based on
One visible light communication system, the system include K element group as shown in Figure 2, every element group include P light-emitting component (such as: glimmering
Light lamp or LED unit etc.), K, P are integer, and K element group for completing an original signal S to be output jointly in the form of visible light
Output.In general, the system can also include a processor, signal processing can be completed and control the flashing of light-emitting component
To complete signal transmission.
Above-mentioned signal processing method specifically includes that
Linear compression processing is carried out to S, obtains to be output group of signal s' of every element groupk, k ∈ (0,1 ..., K-1),
In, the linear compression coefficient of linear compression processing is related to K, the cell signal s' to be output of every light-emitting component in every element groupp,k
Then meet:
Specifically, to be output group of signal s'kIt can meet:
s′k=K-1S
Wherein, K-1That is linear compression coefficient.
The cell signal s' to be output of every light-emitting component in every element groupp,kIt can be with are as follows:
Implement the present embodiment, after original signal S to be output is mainly carried out linear compression, passes through what is be made of light-emitting component
Element group is transmitted simultaneously, the principle being superimposed using signal in spatial linear, so that the signal of receiving end is element group output
Result s' after Signal averagingk, to revert to and the consistent signal of original signal S to be output, the line of linear compression processing
Property compressed coefficient K-1It is related to element group group number K.In this way, the transmission pressure of a light-emitting component can be passed through several element groups
It is shared, after linear compression is handled, the signal power of every set of pieces group is substantially reduced, and is not easily accessible to transmit signal
Between the inelastic region of light-emitting component, the case where reducing distorted signals, and computation complexity is low.
Embodiment two:
The present embodiment is on the basis of embodiment one, it is further provided following content:
The visible light communication system of the present embodiment can be as shown in Figure 3.
Linear compression processing is carried out to S, obtains to be output group of signal s' of every element groupk, it specifically includes:
Firstly, carrying out linear compression processing to S, the initial group signal s to be output of every element group is obtainedk:
Specifically, initial group signal s to be outputk(similar with embodiment one) can be met:
sk=K-1S
Then, to every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, s' is obtainedk,Wherein,For the resulting compressed signal group of non-uniform quantizing compression processing,For compression processing compensating for loss and damage signal group, N round numbers,In s'p,kAccording to skWithIn s'p,k
Difference get.
Specifically, non-uniform quantizing compression processing is mu-law companding is handled or A-law compandor is handled etc..It is restrained in the present embodiment with μ
It is illustrated for companding processing.
Compressed signal groupIn s'p,kIt can obtain in the following way:
Wherein, v and μ respectively represents companding thresholding and companding coefficient；Sign () represents sign function.
And compression processing compensating for loss and damage signal groupIn s'p,kIt can obtain in the following way:
s′p+1,k=sk-s′p,k
This is indicated: when by obtaining compressed signal groupIn s'p,kAfterwards, i.e., in combination with sk, and then obtain at compression
Manage compensating for loss and damage signal groupIn s'p,k。
When specific operation, for convenience, N can use 0 value, and in other embodiments, other numerical value can be taken.
Under O-OFDM application scenarios, since the PAPR of signal is excessively high, the non-of LED is easily accessible when can signal be transmitted
Linearly interval, to cause the distortion of signal, and LED modulating range is limited meeting so that influence of the high PAPR to system is tighter
Weight.Implement the present embodiment, signal (the compressed signal group after companding is transmitted by part in every element group (N+1) light-emitting componentIn s'p,k), companding compensating for loss and damage signal is transmitted by another part in every element group (P-N-1) light-emitting component
(compression processing compensating for loss and damage signal groupIn s'p,k), so that recovery can be superimposed in signal transmission space, no
Receiving end is needed to carry out solution companding operation again again, so that it may the loss of signal caused by companding be made up, signal is not caused
Distortion；And utilize non-uniform quantizing compression processing, wherein parameter μ represents the degree of compression, the bigger degree for representing companding of μ
Bigger, v represents a target value (average value that may be set to signal) for companding, in this case passes through this formula, big signal
It will be compressed, small signal will be elevated, to realize the effect for the PAPR for reducing signal.
Embodiment three:
The present embodiment is on the basis of embodiment two, it is further provided following content:
The visible light communication system of the present embodiment can be as shown in Figure 4.
To every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, s' is obtainedk, it specifically includes:
Firstly, to every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, obtains often shining in every element group
The initial cell signal to be output of element
Specifically, proving to learn by deriving: the difference in channel model between channel is a real and positive number,
Difference between channel can carry out power regulation by the light-emitting component to different channels, Lai Shixian channel difference eliminate (or
Referred to as are as follows: the different compensation of bad channel).
Initial cell signal to be output(similar with embodiment two) can be obtained in the following way:
It is still illustrated so that mu-law companding is handled as an example in the present embodiment.
Compressed signal groupInIt can obtain in the following way:
Wherein, v and μ respectively represents companding thresholding and companding coefficient；Sign () represents sign function.
And compression processing compensating for loss and damage signal groupInIt can obtain in the following way:
This is indicated: when by obtaining compressed signal groupInAfterwards, i.e., in combination with sk, and then obtain at compression
Manage compensating for loss and damage signal groupIn
When specific operation, for convenience, N can use 0 value, and in other embodiments, other numerical value can be taken.
Secondly, to everyPower regulation is carried out using power is made up, obtains s'p,k。
Specifically, determination makes up power q using the channel conditions of every light-emitting componentp,k.Such as: signal is in transmission
Before, the channel conditions of each light-emitting component are first measured, are divided into good job between channel conditions, for each channel conditions, can be led to
Cross qp,kIt is adjusted, channel conditions difference, usual qp,k> 1, channel conditions are very good, qp,k< 1, channel conditions and receiving end
When channel conditions for equilibrium are consistent, qp,k=1.
So, s'p,kIt can meet:
In the case of different for a plurality of light-emitting elements channel conditions, receiving end is balanced according to broken zero (Zero-Forcing)
Method, effect is poor, influences signaling protein14-3-3, to influence error rate of system, implements the present embodiment, then can carry out channel
Disparity compensation, so that promotion signal recovery effects, guarantee system performance.
Example IV:
Present embodiments provide a kind of visible light communication method, it is seen that optical communication method includes as described in the various embodiments described above
Signal processing method.
The present embodiment additionally provides a kind of visible light communication system, which includes: K element group, processor and storage
Device, every element group include P light-emitting component, and K, P are natural number, K element group be used to complete jointly in the form of visible light one to
The output of original signal S is exported, memory is stored with the computer program called for processor, and computer program is when calling
Executable signal processing method or visible light communication method as described in the various embodiments described above.
The present embodiment additionally provides a kind of computer storage medium, and computer storage medium is stored with computer program, meter
Calculation machine program calls executable signal processing method or visible light communication method as described in the various embodiments described above by processor.
Effect and experimental data
(1) complementary cumulative distribution performance
Complementary cumulative distribution (Complementary Cumulative Distribution Function, CCDF) is to use
To define the probability that peak to average in multicarrier transmission systems is more than a certain threshold value γ.CCDF can be used to measure in ofdm system
The statistical property of signal PAPR.
As seen in Figure 5, method presented here and original signal, with Choose for user (SLM) method and slicing
(Clipping) method compares respectively, it can be seen that mentioned method has the effect of reducing signal PAPR well herein.
Compared to primal system (the untreated list LED Transmission system of signal), mentioned method has the promotion of 7dB about CCDF performance；
Compared to SLM method and Clipping method, there are the promotion of 3dB and 1dB respectively.But in terms of complexity, context of methods ratio
SLM method wants low.
(2) Nonlinear elimination performance
As seen in Figure 6, the bit error rate (Bit Error Rate, BER) is to measure data data at the appointed time
Transmit the index of accuracy.The bit error rate=error code in transmission/gross yards × 100% transmitted.By carrying out K times to signal
Linear compression (K=1,2,4,6), while being transmitted using K LED light, the signal received missed in receiving end
The calculating of code rate, it can be seen that compression multiple is bigger, and system inhibits nonlinear effect better.
1.1.1 (3) total system bit error rate performance
Parameter setting in this emulation is as shown in the table:
Fig. 7 show more LED association of proposed PAPR inhibition and LED Nonlinear elimination based on spatial modulation
Adjust the bit error rate performance comparison diagram of LiFi Transmission system.Meanwhile also to some traditional methods such as SLM, Clipping, biography in figure
System mu-law companding has done some comparisons.It can be seen that process proposed herein is substantially better than other several sides in BER aspect of performance
Method.This is because traditional Clipping and mu-law companding method causes the distortion of signal while reducing PAPR, thus shadow
The BER performance of system has been rung, and context of methods is compensated for traditional mu-law companding method and is made by the way of multiple LED coordinating transmissions
At the loss of signal.SLM method is due to needing a large amount of retrieval, so its complexity wants much higher compared to context of methods.
Since the nonlinear influence of LED will result in excessive signal and enter LED's with constantly increasing for signal-to-noise ratio
Between inelastic region, the performance of system can first improve to be deteriorated afterwards, at this moment just will appear a turning point on BER curve.In 22dB
Before, the BER performance difference of the BER performance of original signal and the mentioned method of this paper is little, but with the promotion of BER, system
Performance apparent difference will occur.
Moreover, in order to investigate the effect of proposed channel difference removing method, what is eliminated without channel difference
System and the system that the elimination of channel difference is added have done a comparison, it can be seen that the system ratio of channel difference elimination is added not
The high 6dB of system performance or so that channel difference is eliminated.So the system that channel difference removing method is added has preferably
BER performance.The appearance of the ber curve turning point of mentioned method is lower than 10-8 herein, this is significantly lower than other methods.So
It can be seen that this method, which has, preferably resists nonlinear effect compared with other methods.Due to depositing for LED non-linear effects
Other methods are not appropriate for the transmission in high s/n ratio.
Claims (10)
1. the signal processing method in a kind of visible light communication, which is characterized in that the signal processing method is based on a visible light
Communication system, it to include P light-emitting component per the element group that the system comprises K element groups, and K, P are integer, and K described
Element group is used to complete the output of an original signal S to be output jointly in the form of visible light, which comprises
Linear compression processing is carried out to S, obtains the to be output group of signal s' per the element groupk, k ∈ (0,1 ..., K-1),
In, the linear compression coefficient of the linear compression processing is related to K, to be output per the light-emitting component in every element group
Cell signal s'p,kThen meet:p∈(0,1,...,P-1)。
2. signal processing method as described in claim 1, which is characterized in that carry out linear compression processing to S, obtain per described
To be output group of signal s' of element groupk, it specifically includes:
Linear compression processing is carried out to S, obtains the initial group signal s to be output per the element groupk；
To every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, s' is obtainedk,
Wherein,For the resulting compressed signal group of non-uniform quantizing compression processing,For compression processing compensating for loss and damage signal
Group, N round numbers,In s'p,kAccording to skWithIn s'p,kDifference get.
3. signal processing method as claimed in claim 2, which is characterized in that the non-uniform quantizing compression processing is μ rule pressure
Expand processing or A-law compandor processing.
4. signal processing method as claimed in claim 2, which is characterized in that every skCarry out non-uniform quantizing compression processing and
Compensating for loss and damage processing, obtains s'k, it specifically includes:
To every skNon-uniform quantizing compression processing and compensating for loss and damage processing are carried out, is obtained in per the element group per the luminous member
The initial cell signal to be output of part
To everyPower regulation is carried out using power is made up, obtains s'p,k。
5. signal processing method as claimed in claim 4, which is characterized in that the signal processing method further include:
Using the channel conditions of every light-emitting component, power is made up described in determination.
6. signal processing method according to any one of claims 1 to 5, which is characterized in that the linear compression coefficient is K-1。
7. a kind of visible light communication method, which is characterized in that the visible light communication method includes as any in claim 1-6
Signal processing method described in.
8. a kind of visible light communication system, which is characterized in that the system comprises: K element group, processor and memory, often
The element group includes P light-emitting component, and K, P are natural number, and the K element groups for completing one jointly in the form of visible light
The output of original signal S to be output, the memory are stored with the computer program called for the processor, the calculating
Machine program is executable such as method of any of claims 1-7 when calling.
9. system as claimed in claim 8, which is characterized in that the light-emitting component is Light-emitting diode LED unit.
10. a kind of computer storage medium, which is characterized in that the computer storage medium is stored with computer program, described
Computer program is called executable such as method of any of claims 1-7 by processor.
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| CN112564798A (en) * | 2020-11-30 | 2021-03-26 | 哈尔滨工业大学（深圳） | Signal processing method, device, system and storage medium for visible light communication system |
| CN112910552A (en) * | 2019-12-03 | 2021-06-04 | Oppo广东移动通信有限公司 | LiFi communication device and electronic equipment |
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