CN109412701A - A kind of selection odd-order quadrature amplitude modulation signal precoding constellation point methods - Google Patents
A kind of selection odd-order quadrature amplitude modulation signal precoding constellation point methods Download PDFInfo
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- CN109412701A CN109412701A CN201811434994.2A CN201811434994A CN109412701A CN 109412701 A CN109412701 A CN 109412701A CN 201811434994 A CN201811434994 A CN 201811434994A CN 109412701 A CN109412701 A CN 109412701A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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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
The invention discloses a kind of methods for selecting odd-order quadrature amplitude modulation signal precoding constellation point, comprising the following steps: setting bias current and signal strength peak-to-peak value；It selects precoding constellation point for conventional constellation point, modulates, receives and record the first transmitting signal；According to the first of record the transmitting signal, the first transmitting signal is demodulated and obtains first bit error rate；It selects precoding constellation point for full Gray's constellation point, modulate, receive and records the second transmitting signal；According to the second of record the transmitting signal, the second transmitting signal is demodulated and obtains second bit error rate；According to first bit error rate and second bit error rate of acquisition, error code difference correction matrix is calculated；According to the bias current of setting and signal strength peak-to-peak value and standard error code difference formula, standard error code difference matrix is calculated；Matrix is corrected according to error code difference and standard error code difference matrix establishes model, and suitable precoding constellation point is obtained according to the peak-to-peak value of the bias current and signal strength of model and setting.
Description
Technical field
The present invention, which discloses, is related to the communications field more particularly to a kind of selection odd-order quadrature amplitude modulation signal precoding star
Seat point methods.
Background technique
Visible light communication (Visible Light Communication, VLC) technology refers to the light using visible light wave range
As carrier, in the case where being not necessarily to optical fiber lamp cable medium, the communication mode of optical signal is directly transmitted by air.Visible light
Communication can be realized based on commercialization LED, for can also be used for high-speed communication while illumination.As a kind of emerging wireless communication
Means, it is seen that with no electromagnetic interference, frequency spectrum resource is abundant and without registration for optic communication, and it is excellent that low in cost and confidentiality is high etc.
Gesture.Extensive with commercial LED is popularized, it is seen that optic communication will be in following military industry field, smart home, the neck such as city security protection
Domain plays a significant role.
Visible light communication needs to realize that in many occasions the transmission of high-speed needs the direct current by LED inclined at this time at a distance
It sets and increases with signal amplitude to increase transmitting light intensity.However, LED at this time would operate in inelastic region, i.e. light intensity and signal electricity
The no longer linear relationship of voltage crest peak value, this is by strong influence communication quality.Meanwhile the data transmission of high-speed can bring code
Between interfere so that the performance of system declines.For normal odd-order quadrature amplitude modulation, cannot achieve entirely in pre-coding stage
Gray code, and the effect of full Gray's precoding constellation point is better than just under inelastic region or the biggish situation of intersymbol interference
Normal precoding constellation point.Therefore, if there is a kind of method can select the biggish constellation point of Euclidean distance in linear zone, non-
Linear zone selects the constellation point of full Gray code, in this way can effective lifting system performance.However existing visible light communication hand
There is no the schemes effectively selected according to bias current and signal amplitude it in section.Therefore, there is an urgent need to one kind can
The scheme of different precoding constellation points is effectively selected according to different bias current and signal amplitude, with lifting system different inclined
Set electric current and signal peak value voltage under performance.
Summary of the invention
The embodiment of the present invention is to be selected in inelastic region in the biggish conventional constellation point of linear zone selection Euclidean distance
The constellation point of full Gray code develops a kind of selection odd-order quadrature amplitude modulation letter for the purpose of effective lifting system performance
Number precoding constellation point methods, effectively can select different precoding constellation points according to different bias current and signal amplitude
Scheme, with performance of the lifting system under different bias currents and signal peak value voltage.
The embodiment of the invention provides a kind of method for selecting odd-order quadrature amplitude modulation signal precoding constellation point, packets
Include following steps:
Bias current and signal strength peak-to-peak value are set；
It selects precoding constellation point for conventional constellation point, modulates, receives and record the first transmitting signal；
According to the first of record the transmitting signal, the first transmitting signal is demodulated and obtains first bit error rate；
It selects precoding constellation point for full Gray's constellation point, modulate, receive and records the second transmitting signal；
According to the second of record the transmitting signal, the second transmitting signal is demodulated and obtains second bit error rate；
According to first bit error rate and second bit error rate of acquisition, error code difference correction matrix is calculated；
According to the bias current of setting and signal strength peak-to-peak value and standard error code difference formula, standard error code is calculated
Poor matrix；
Correct matrix and standard error code difference matrix according to error code difference and establish model, according to model and the bias current of setting with
And the peak-to-peak value of signal strength obtains suitable precoding constellation point.
Further, according to the first of record the transmitting signal, first bit error rate is demodulated and is obtained to the first transmitting signal, is had
Body includes:
According to the bias current of setting and signal strength peak-to-peak value, obtained by receiving end detecting device and decoding recovery device
Obtain first bit error rate.
Further, according to the second of record the transmitting signal, second bit error rate is demodulated and is obtained to the second transmitting signal, is had
Body includes:
According to the bias current of setting and signal strength peak-to-peak value, obtained by receiving end detecting device and decoding recovery device
Obtain second bit error rate.
Further, according to first bit error rate of acquisition and second bit error rate, error code difference correction matrix is calculated, specifically
Include:
Practical error code difference matrix is obtained according to first bit error rate of acquisition and second bit error rate；
Optimize practical error code difference matrix, obtains error code difference correction matrix.
The embodiment of the invention provides a kind of device for selecting odd-order quadrature amplitude modulation signal precoding constellation point, packets
It includes:
Device is set, for bias current and signal strength peak-to-peak value to be arranged；
First recording device is modulated, is received and record the first transmitting for selecting precoding constellation point for conventional constellation point
Signal；
First demodulating equipment, for being demodulated to the first transmitting signal and obtaining first according to the first of record the transmitting signal
The bit error rate；
Second recording device is modulated, is received and record the second hair for selecting precoding constellation point for full Gray's constellation point
Penetrate signal；
Second demodulating equipment, for being demodulated to the second transmitting signal and obtaining second according to the second of record the transmitting signal
The bit error rate；
The correction of error code difference is calculated for first bit error rate and second bit error rate according to acquisition in first computing device
Matrix；
Second computing device, for public according to the bias current and signal strength peak-to-peak value and standard error code difference of setting
Standard error code difference matrix is calculated in formula；
Selection device according to model and is set for establishing model according to error code difference correction matrix and standard error code difference matrix
The peak-to-peak value of the bias current and signal strength set obtains suitable precoding constellation point.
Further, the first demodulating equipment specifically includes:
First obtains module, for the bias current and signal strength peak-to-peak value according to setting, is detected and is filled by receiving end
It sets and decodes recovery device and obtain first bit error rate.
Further, the second modulating device specifically includes:
Second obtains module, for the bias current and signal strength peak-to-peak value according to setting, is detected and is filled by receiving end
It sets and decodes recovery device and obtain second bit error rate.
Further, the first computing device specifically includes:
First computing module, for obtaining practical error code difference matrix according to first bit error rate and second bit error rate of acquisition；
Optimization module obtains error code difference correction matrix for optimizing practical error code difference matrix.
The embodiment of the invention provides a kind of electronic equipment, including memory and processor, and memory is for storing one
Or a plurality of computer instruction, wherein one or more computer instruction is executed by processor to realize a kind of such as above-mentioned selection
The method of odd-order quadrature amplitude modulation signal precoding constellation point.
The embodiment of the invention provides a kind of computer readable storage medium for being stored with computer program, computer programs
The method such as a kind of above-mentioned selection odd-order quadrature amplitude modulation signal precoding constellation point is realized when executing computer.
A kind of method selecting odd-order quadrature amplitude modulation signal precoding constellation point provided in an embodiment of the present invention, has
Effect solves the method for precoding of VISIBLE LIGHT SYSTEM quadrature amplitude modulation signal in the case where modulation format is odd-order.By using this
The method for precoding of invention can effectively promote the performance of odd-order VISIBLE LIGHT SYSTEM, increase the message capacity of system.The present invention is real
Now get up relatively easy, after model has corrected, as long as the current value of setting and signal strength peak peak value are brought into revised
Standard error code difference formula can determine the mode of the precoding under the Current Voltage value.
Detailed description of the invention
Fig. 1 is a kind of selection odd-order quadrature amplitude modulation signal precoding constellation point that the embodiment of the present invention one provides
The flow diagram of method；
Fig. 2 is a kind of selection odd-order quadrature amplitude modulation signal precoding constellation point provided by Embodiment 2 of the present invention
The flow diagram of method；
Fig. 3 is a kind of selection odd-order quadrature amplitude modulation signal precoding constellation point that the embodiment of the present invention three provides
The schematic diagram of device.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
In being described below, for illustration and not for limitation, the tool of such as specific internal program, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In order to illustrate technical solution of the present invention, the following is a description of specific embodiments.
Embodiment one
The embodiment of the present invention one provides a kind of method for selecting odd-order quadrature amplitude modulation signal precoding constellation point,
Fig. 1 is a kind of stream of the method for selection odd-order quadrature amplitude modulation signal precoding constellation point that the embodiment of the present invention one provides
Journey schematic diagram.As shown in Figure 1, a kind of side of selection odd-order quadrature amplitude modulation signal precoding constellation point of the present embodiment
Method may comprise steps of:
Step 101, bias current and signal strength peak-to-peak value are set；
Step 102, it selects precoding constellation point for conventional constellation point, modulates, receives and record the first transmitting signal；
Step 103, according to the first of record the transmitting signal, the first transmitting signal is demodulated and obtains first bit error rate；
Step 104, it selects precoding constellation point for full Gray's constellation point, modulate, receive and records the second transmitting signal；
Step 105, according to the second of record the transmitting signal, the second transmitting signal is demodulated and obtains second bit error rate；
Step 106, according to first bit error rate of acquisition and second bit error rate, error code difference correction matrix is calculated；
Step 107, it according to the bias current of setting and signal strength peak-to-peak value and standard error code difference formula, is calculated
Standard error code difference matrix；
Step 108, model is established according to error code difference correction matrix and standard error code difference matrix, according to the inclined of model and setting
The peak-to-peak value for setting electric current and signal strength obtains suitable precoding constellation point.
The detailed process of the present embodiment explained below:
It is lighted after transmitting terminal LED is accessed signal transmitting system, and records the transmitting signal of emission system, then selection is pre-
Encoding constellation point refers to the hair in emission system as conventional constellation point, the transmitting signal of modulate emission signal, the present embodiment
Penetrate the signal of end signal and receiving end.After receiving simultaneously tracer signal, the first transmitting signal of conventional constellation point is demodulated,
Obtain first bit error rate；Then complete the second transmitting of Gray's precoding constellation point modulation signal is selected, after receiving simultaneously tracer signal,
Second transmitting signal of full Gray's precoding constellation point is demodulated, obtains second bit error rate again；According to second obtained
Practical error code difference matrix is calculated in the bit error rate, and error code difference correction matrix is obtained after optimizing to practical error code difference matrix；
Meanwhile bringing set bias current and signal strength peak peak value into standard error code difference formula, and standard is obtained by calculation
Error code difference matrix；Matrix is corrected according to error code difference and standard error code difference matrix is optimized and handled to model, and finally obtaining can
To be used to select the model of suitable precoding constellation point.According to the model after optimization processing, only it is to be understood that the electric current of setting and
Signal strength peak-to-peak value, bringing model into can be obtained suitable precoding constellation point.
A kind of method of selection odd-order quadrature amplitude modulation signal precoding constellation point of the present embodiment efficiently solves
The precoding mode select permeability of VISIBLE LIGHT SYSTEM quadrature amplitude modulation signal in the case where modulation format is odd-order.By using this
The method for precoding of invention can effectively promote the performance of odd-order VISIBLE LIGHT SYSTEM, increase the message capacity of system, and model makes
With relatively easy, calculation amount is small.When model can be used, only bringing bias current and signal strength peak-to-peak value into be can be obtained suitably
Precoding constellation point.
Embodiment two
Second embodiment of the present invention provides it is a kind of select odd-order quadrature amplitude modulation signal precoding constellation point method,
Fig. 2 is a kind of stream of method for selecting odd-order quadrature amplitude modulation signal precoding constellation point provided by Embodiment 2 of the present invention
Journey schematic diagram.As shown in Fig. 2, a kind of side of selection odd-order quadrature amplitude modulation signal precoding constellation point of the present embodiment
Method may comprise steps of:
Step 201, the rank of bias current, the quadrature amplitude modulation signal that the peak value of signal strength peak and needs are modulated is recorded
Number；
Step 202, the optical power of transmitting terminal and the optical power of receiving end are recorded；
Step 203, select precoding constellation point as conventional constellation point；
Step 204, according to the first of record the transmitting signal, the bias current value of setting and the peak value of signal strength peak, lead to
It crosses receiving system and demodulates first bit error rate that recovery system obtains system；
Step 205, select precoding constellation point for full Gray coded constellation point；
Step 206, according to the second of record the transmitting signal, the bias current value of setting and the peak value of signal strength peak, lead to
It crosses receiving system and demodulates the ber value that recovery system obtains system；
Step 207, practical error code difference matrix is calculated according to the ber value that above step obtains, and is missed by optimization
Code difference correction matrix.
Step 208, the bias current value of setting and signal strength peak-to-peak value substitute into standard error code difference formula, obtain standard error
Code difference；According to standard error code difference, standard error code difference matrix is obtained；
Step 209, the standard error code difference according to obtained error code difference correction matrix and standard error code difference matrix optimizing is public
Formula, until model meets related request.
The present embodiment is to carry out detailed explanation to each step in embodiment one on the basis of example 1.
It will illustrate the specific implementation of the present embodiment with specific example below:
Step 201, the rank of bias current, the quadrature amplitude modulation signal that the peak value of signal strength peak and needs are modulated is recorded
Number；Specifically,
Will transmitting terminal LED access emission system after light, and record the bias current I1 of emission system and need to modulate
The order M of quadrature amplitude modulation signal.
Step 202, the optical power of transmitting terminal and the optical power of receiving end are recorded；Specifically,
Measure the optical power P of transmitting terminals1；
Measure the optical power P of receiving endR1；
It repeats the above steps m times, is recorded in m bias current I1,I2,…ImThe optical power P of lower transmitting terminalS1,PS2,…PSm
With the optical power P of receiving endR1,PR2,…PRm；Wherein I1For current minimum, ImFor current maxima, and meet
Step 203, select precoding constellation point for conventional constellation point.
Step 204, according to the first of record the transmitting signal, the bias current value of setting and the peak value of signal strength peak, lead to
It crosses receiving system and demodulates first bit error rate that recovery system obtains system.Specifically,
Bias current value is set as I1, signal strength peak crest voltage is Vpp1, and by receiving end detecting device and decoding
The ber value BER of recovery device acquisition system11。
It is respectively I that bias current value, which is arranged,1~Im, the peak-to-peak value voltage of signal strength is respectively Vpp1~Vppn, wherein Vpp1
For signal peak value voltage minimum, VppnFor signal peak value voltage max, and meetUnder each current value and signal peak value voltage by receiving end detection system and
Demodulate the ber value BER that recovery system obtains system11, BER12... BERij,…BERmn.Wherein BERijIndicate bias current
For Ii, signal voltage peak-to-peak value VppjUnder the bit error rate that measures.
Step 205, select precoding constellation point for full Gray coded constellation point.
Step 206, according to the second of record the transmitting signal, the bias current value of setting and the peak value of signal strength peak, lead to
It crosses receiving system and demodulates second bit error rate that recovery system obtains system, it may be assumed that setting bias current value is respectively I1~
Im, the peak-to-peak value voltage of signal strength is respectively Vpp1~Vppn, wherein Vpp1For signal peak value voltage minimum, VppnFor signal
Peak-to-peak value voltage max, and meetIn each current value and signal peak value electricity
Pressure acquires m*n ber value BER ' by receiving end detection system and demodulation recovery system11, BER '12... BER
′ij,…BER′mn.Wherein BER 'ijExpression bias current is Ii, signal voltage peak-to-peak value VppjUnder the bit error rate that measures.
Step 207, practical error code difference matrix is calculated according to the ber value that above step obtains, and is missed by optimization
Code difference correction matrix, i.e., take 10 logarithm, and under same Current Voltage to the ber value obtained under two kinds of constellation points
Value subtract each other, obtain error code difference matrix:
Point for absolute value in Δ BER greater than 0.4 subtracts 0.3 if its value is positive, and otherwise adds 0.3.
By all values in Δ BER divided by 1.5, final error code difference correction matrix Δ NBER is obtained.
Step 208, the peak value that bias current value and signal strength peak is arranged substitutes into standard error code difference formula, obtains standard error
Code difference, according to standard error code difference, as standard error code difference matrix；Specifically:
It is I that bias current value, which is respectively set,1~Im, the peak-to-peak value voltage of signal strength is Vpp1~Vppn, substitute into standard error code
Poor formula:
M*n standard error code difference is obtained, and is denoted as standard error code difference matrixIts
In, a is error code difference constant coefficient, and π is mathematics pi, IS1,IS2Respectively the first, the second current center's response.VppsFor
Voltage center's response.B is voltage and current sinusoidal response coefficient, and m is sinusoidal argument coefficient, and c is voltage correction factor, and w is electricity
Pressure amplitude value correction factor, d are electric current correction factor, and f is current squaring correction factor, and h is the second correction factor of electric current, k the
Two current squaring correction factors, g are voltage tangent response coefficient, λijFor optical power attenuation regulatory factor.
Step 209, the standard error code difference according to obtained error code difference correction matrix and standard error code difference matrix optimizing is public
Formula, so that model meets related request；Specifically:
The number (0 does not calculate) for calculating the value that symbol does not wait in Δ NBER and N, is denoted as flag.IfThen indicate
The model is available；If condition is not satisfied, the deviation square for the error code difference that all symbols do not wait is calculated according to formulaP, q are respectively the electric current and voltage value subscript of r-th of error code difference, and r is 1 to certain between flag
A value, and sum to all deviations square, obtain sum of square of deviationsIf less than 0.04, then it represents that the mould
Type is still available, but the value for adjusting a in (10) is needed to makeIf it is greater than 0.04 or adjust a value still without
Method makesThen the model is unavailable, needs to adjust IS1, IS2And VppsValue, until meet
For the model having had built up, setting electric current value is I1~ImBetween arbitrary value Is, signal voltage value Vpp1
~VppnBetween arbitrary value Vpps.By IsAnd VppsIt substitutes into the standard error code difference formula in (10), if obtained Nons> 0, then it selects
It selects full Gray coded constellation point and carries out precoding, conventional constellation point is otherwise selected to carry out precoding.
According to the present embodiment the method, 5 rank quadrature amplitude modulation signals are tested in visible light communication system
The experiment of card property.The current regulation scope chosen in replication experiment of the invention be 50mA to 230mA, signal peak value voltage from
0.6V to 1.8V takes 7 points respectively, 30mA, voltage change interval 0.2V is divided between curent change.
In replication experiment, the value of each parameter is as follows:
| Parameter | Value |
| a | -7.991 |
| b | 0.8161 |
| c | 0.4914 |
| d | 0.7946 |
| f | 2.296 |
| g | -1.3 |
| h | -0.7033 |
| k | 0.485 |
| l | 6.539 |
| m | 1.117 |
| w | 5.893 |
It is measured according to experiment, the BER value for obtaining normal constellation point is as follows:
It is measured according to experiment, the BER value for obtaining full Gray's precoding constellation point is as follows:
After processing, obtained error code difference correction matrix is as follows:
After processing, obtained standard error code difference matrix is as follows:
By calculating, error number flag=3 is obtained, model needs are met.Prove that the model can be used.
Arbitrarily three bias currents of selection and the verifying of signal voltage peak-to-peak value, measure its correction error code difference and standard error code is poor
It is respectively as follows:
| Serial number | Bias current (A) | Signal voltage (V) | It is poor to correct error code | Standard error code is poor |
| 1 | 0.07 | 0.8 | -0.1263 | -0.0955 |
| 2 | 0.13 | 1.2 | -0.0029 | -2.85*10^(-4) |
| 3 | 0.19 | 1.6 | 0.1357 | 0.1726 |
As can be seen that the correction error code difference that is obtained after its actual measurement of different operating points of model in the present embodiment with pass through
The symbol for the standard error code difference that model is calculated is identical, indicates that the model can accurately filter out suitable precoding mode.
Wherein, in the present embodiment also it should be noted that: emission system described in the present embodiment includes direct current
Source, BIAS-TEE, LED, passive equalization circuit plate, random signal generator.Wherein:
DC power supply are as follows: gwinstek GPD-4303S DC power supply
BIAS-TEE are as follows: ZFBT-4R2GW-FT+
LED are as follows: HT-XM50-XM2 blue lamp bead
Random signal generator: Tyke AWG710
Passive equalization circuit plate is self-control T-type bridge-type passive equalization circuit plate.
Receiving system in the present embodiment includes PIN, receives circuit and amplifier.Wherein:
PIN are as follows: S10784.
Receiving circuit is that the self-control based on max3665 receives circuit.
Amplifier are as follows: ZHL-6A-S+
Demodulation recovery system in the present embodiment includes oscillograph, laptop and demodulation software.Wherein:
Oscillograph are as follows: Agilent 54855A DSO
Laptop are as follows: DELL laptop.
Demodulation software are as follows: the demodulation software that matlab voluntarily writes.
A kind of method of selection odd-order quadrature amplitude modulation signal precoding constellation point of the present embodiment efficiently solves
The method for precoding of VISIBLE LIGHT SYSTEM quadrature amplitude modulation signal in the case where modulation format is odd-order, by using of the invention pre-
Coding method can effectively promote the performance of odd-order VISIBLE LIGHT SYSTEM, increase the message capacity of system.The present invention implements phase
To be easy, after model has corrected, as long as bringing the current value of setting and signal Vpp value into revised standard error code difference formula
It can determine the mode of the precoding under the Current Voltage value.
Embodiment three
The embodiment of the present invention three provides a kind of device for selecting odd-order quadrature amplitude modulation signal precoding constellation point,
As shown in figure 3, a kind of device of selection odd-order quadrature amplitude modulation signal precoding constellation point of the present embodiment, comprising:
Device 310 is set, for bias current and signal strength peak-to-peak value to be arranged；
First recording device 320 is modulated, is received and record first for selecting precoding constellation point for conventional constellation point
Emit signal；
First demodulating equipment 330, for being demodulated to the first transmitting signal and obtaining the according to the first of record the transmitting signal
One bit error rate；
Second recording device 340, for selecting precoding constellation point for full Gray's constellation point, modulating, receive and recording
Two transmitting signals；
Second demodulating equipment 350, for being demodulated to the second transmitting signal and obtaining the according to the second of record the transmitting signal
Two bit error rates；
First computing device 360 is calculated error code difference and rectifys for first bit error rate and second bit error rate according to acquisition
Positive matrices；
Second computing device 370, for poor according to the bias current and signal strength peak-to-peak value and standard error code of setting
Standard error code difference matrix is calculated in formula；
Selection device 380 establishes model for correcting matrix and standard error code difference matrix according to error code difference, according to model and
The bias current of setting and the peak-to-peak value of signal strength obtain suitable precoding constellation point.
Further, the first demodulating equipment 330, specifically includes:
First acquisition module 331 is detected for the bias current and signal strength peak-to-peak value according to setting by receiving end
Device and decoding recovery device obtain first bit error rate.
Further, the second modulating device 350, specifically includes:
Second acquisition module 351 is detected for the bias current and signal strength peak-to-peak value according to setting by receiving end
Device and decoding recovery device obtain second bit error rate.
Further, the first computing device 360, specifically includes:
First computing module 361, for obtaining practical error code difference square according to first bit error rate and second bit error rate of acquisition
Battle array；
Optimization module 362 obtains error code difference correction matrix for optimizing practical error code difference matrix.
The device of the present embodiment for realizing above-described embodiment selection odd-order quadrature amplitude modulation signal precoding star
The method of seat point, its implementation have been elaborated and have been explained in the above-described embodiments, will not be described in great detail herein.
Example IV
The embodiment of the present invention four provides a kind of electronic equipment, including memory and processor storage for storing one
Or a plurality of computer instruction, wherein one or more computer instruction is executed by the processor to realize any of the above-described implementation
The method of selection odd-order quadrature amplitude modulation signal precoding constellation point described in example.
The embodiment of the invention also provides a kind of computer readable storage medium, the computer-readable recording medium storage
There is computer program, selection odd number described in any of the above-described embodiment may be implemented in the computer program when executing computer
The method of rank quadrature amplitude modulation signal precoding constellation point.It is apparent to those skilled in the art that retouch
That states is convenienct and succinct, the specific work process of the device of foregoing description, can be with reference to corresponding in preceding method embodiment
Journey, details are not described herein.
Illustratively, computer program can be divided into one or more module/units, and one or more module/
Unit is stored in memory, and is executed by processor, to complete the present invention.One or more module/units can be energy
The series of computation machine program instruction section of specific function is enough completed, the instruction segment is for describing computer program in computer equipment
In implementation procedure.
Computer equipment can be desktop PC, notebook, palm PC and cloud server etc. and calculate equipment.Meter
Calculating machine equipment may include, but be not limited only to, processor, memory.It will be understood by those skilled in the art that the present embodiment is only
The example of computer equipment does not constitute the restriction to computer equipment, may include components more more or fewer than diagram, or
Person combines certain components or different components, such as computer equipment can also be set including input-output equipment, network insertion
Standby, bus etc..
Processor can be central processing unit (Central Processing Unit, CPU), can also be that other are logical
With processor, digital signal processor (Digital Signal Processor, DSP), specific 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..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
Memory can be the internal storage unit of computer equipment, such as the hard disk or memory of computer equipment.Storage
Device is also possible to the External memory equipment of computer equipment, such as the plug-in type hard disk being equipped in computer equipment, intelligent storage
Block (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash card (Flash Card) etc..
Further, memory can also both including computer equipment internal storage unit and also including External memory equipment.Memory
For storing other programs and data needed for computer program and computer equipment.Memory can be also used for temporarily depositing
Store up the data that has exported or will export.
The embodiment of the invention also provides a kind of computer readable storage medium for being stored with computer program, computer journeys
The method of the selection odd-order quadrature amplitude modulation signal precoding constellation point of any of the above-described is realized when sequence executes computer.
A kind of method selecting odd-order quadrature amplitude modulation signal precoding constellation point provided in an embodiment of the present invention, has
Effect solves the precoding mode select permeability of VISIBLE LIGHT SYSTEM quadrature amplitude modulation signal in the case where modulation format is odd-order.It is logical
The performance that can effectively promote odd-order VISIBLE LIGHT SYSTEM using method for precoding of the invention is crossed, the message capacity of system is increased.
The present invention implements relatively easily, after model has corrected, as long as the current value of setting and signal strength peak peak value are brought into
Revised standard error code difference formula can determine the mode of the precoding under the Current Voltage value.
Specific embodiments of the present invention are described in detail above.It should be appreciated that those skilled in the art are without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of method for selecting odd-order quadrature amplitude modulation signal precoding constellation point, which is characterized in that including following step
It is rapid:
Bias current and signal strength peak-to-peak value are set；
It selects precoding constellation point for conventional constellation point, modulates, receives and record the first transmitting signal；
According to the first of record the transmitting signal, the first transmitting signal is demodulated and obtains first bit error rate；
It selects precoding constellation point for full Gray coded constellation point, modulates, receives and record the second transmitting signal number；
According to the second of record the transmitting signal, the second transmitting signal is demodulated and obtains second bit error rate；
According to first bit error rate and second bit error rate of acquisition, error code difference correction matrix is calculated；
According to the bias current of setting and signal strength peak-to-peak value and standard error code difference formula, standard error code difference square is calculated
Battle array；
Correct matrix and standard error code difference matrix according to the error code difference and establish model, according to model and the bias current of setting with
And the peak-to-peak value of signal strength obtains suitable precoding constellation point.
2. a kind of method for selecting odd-order quadrature amplitude modulation signal precoding constellation point as described in claim 1, feature
It is, according to the first of record the transmitting signal, demodulates and obtain first bit error rate to the first transmitting signal, specifically include:
According to the bias current of setting and signal strength peak-to-peak value, by receiving end detecting device and decoding recovery device obtains the
One bit error rate.
3. a kind of method for selecting odd-order quadrature amplitude modulation signal precoding constellation point as described in claim 1, feature
It is, according to the second of record the transmitting signal, demodulates and obtain second bit error rate to the second transmitting signal, specifically include:
According to the bias current of setting and signal strength peak-to-peak value, by receiving end detecting device and decoding recovery device obtains the
Two bit error rates.
4. a kind of method for selecting odd-order quadrature amplitude modulation signal precoding constellation point as described in claim 1, feature
It is, according to first bit error rate and second bit error rate of acquisition, error code difference correction matrix is calculated, specifically includes:
Practical error code difference matrix is obtained according to first bit error rate of acquisition and second bit error rate；
Optimize practical error code difference matrix, obtains error code difference correction matrix.
5. a kind of device for selecting odd-order quadrature amplitude modulation signal precoding constellation point characterized by comprising
Device is set, for bias current and signal strength peak-to-peak value to be arranged；
First recording device, for selecting precoding constellation point for conventional constellation point, modulating, receive and recording the first transmitting letter
Number；
First demodulating equipment, for being demodulated to the first transmitting signal and obtaining the first error code according to the first of record the transmitting signal
Rate；
Second recording device, for selecting precoding constellation point for full Gray's constellation point, modulating, receive and recording the second transmitting letter
Number；
Second demodulating equipment, for being demodulated to the second transmitting signal and obtaining the second error code according to the second of record the transmitting signal
Rate；
Error code difference correction matrix is calculated for first bit error rate and second bit error rate according to acquisition in first computing device；
Second computing device, for the bias current and signal strength peak-to-peak value and standard error code difference formula according to setting, meter
Calculation obtains standard error code difference matrix；
Selection device, for establishing model according to error code difference correction matrix and standard error code difference matrix, according to model and setting
Bias current and the peak-to-peak value of signal strength obtain suitable precoding constellation point.
6. a kind of device for selecting odd-order quadrature amplitude modulation signal precoding constellation point as claimed in claim 5, special
Sign is that first demodulating equipment specifically includes:
First obtains module, for the bias current and signal strength peak-to-peak value according to setting, by receive end detecting device and
It decodes recovery device and obtains first bit error rate.
7. a kind of device for selecting odd-order quadrature amplitude modulation signal precoding constellation point as claimed in claim 5, special
Sign is that second modulating device specifically includes:
Second obtains module, for the bias current and signal strength peak-to-peak value according to setting, by receive end detecting device and
It decodes recovery device and obtains second bit error rate.
8. a kind of device for selecting odd-order quadrature amplitude modulation signal precoding constellation point as claimed in claim 5, special
Sign is that first computing device specifically includes:
First computing module, for obtaining practical error code difference matrix according to first bit error rate and second bit error rate of acquisition；
Optimization module obtains error code difference correction matrix for optimizing practical error code difference matrix.
9. a kind of electronic equipment, which is characterized in that including memory and processor, the memory is for storing one or more
Computer instruction, wherein one or more computer instruction is executed by the processor to realize as in claim 1-4
A kind of described in any item methods for selecting odd-order quadrature amplitude modulation signal precoding constellation point.
10. a kind of computer readable storage medium for being stored with computer program, which is characterized in that the computer program makes to count
A kind of such as selection odd-order quadrature amplitude modulation signal precoding of any of claims 1-4 is realized when calculation machine executes
The method of constellation point.
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