CN109067472B - Multicolor optical signal receiving method based on overlapping covering optical filter set - Google Patents

Multicolor optical signal receiving method based on overlapping covering optical filter set Download PDF

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CN109067472B
CN109067472B CN201810964510.9A CN201810964510A CN109067472B CN 109067472 B CN109067472 B CN 109067472B CN 201810964510 A CN201810964510 A CN 201810964510A CN 109067472 B CN109067472 B CN 109067472B
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CN109067472A (en
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梁霄
葛鹏飞
王家恒
赵春明
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Southeast University
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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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/67—Optical arrangements in the receiver
    • H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
    • H04B10/675—Optical arrangements in the receiver for controlling the input optical signal for controlling the optical bandwidth of the input signal, e.g. spectral filtering
    • 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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Abstract

The invention discloses a method for receiving a multicolor optical signal based on an overlapping covering filter set, which comprises the following steps: considering a system of M color lights, uniformly dividing a visible light frequency range into (N +1)/2 intervals; each frequency band interval adopts a rectangular passband optical filter, 1 same rectangular passband optical filter is added at the contact position of every two adjacent optical filters, the added rectangular passband optical filters and the left and right optical filters are respectively overlapped by half, so that an optical filter group with overlapped visible light frequency bands is formed, and the total number of the optical filters is N; for M colored lights, weighting and combining the signals received by the N optical filters by using M different weight vectors respectively to obtain M paths of combined colored light signals; and carrying out subsequent detection on the color light signals after the M paths of combination to restore the sending signals. The receiving method disclosed by the invention supports the incidence of light rays at any angle, supports any number of colored light rays and realizes the universality of signal receiving.

Description

Multicolor optical signal receiving method based on overlapping covering optical filter set
Technical Field
The invention relates to a multicolor optical signal receiving method based on an overlapping covering filter set, belonging to the field of visible light communication.
Background
In recent years, conventional Radio Frequency (RF) communication technologies have been unable to meet the high rate demands of the mobile internet due to the scarcity of spectrum resources. In this context, visible light communication has been extensively studied. Visible Light Communication (VLC) utilizes a driving circuit to load transmission information into rapidly changing light emitted by an LED, and under the condition that the modulation rate of the LED is high enough, human eyes cannot perceive the change of the light, so that the simultaneous implementation of data communication and indoor illumination is ensured, and the problem of 'last meter' of communication transmission is solved.
In order to further increase the transmission rate of visible light communication, the way of parallel transmission of multi-color LEDs is receiving more and more attention. By mixing polychromatic light (such as three-color RGB, four-color RGBA, or large-scale polychromatic light) into a path of white light, and separating the various colors of light by using an optical filter at a receiving end for detection, Wavelength Division Multiplexing (WDM) of data can be realized while illumination conditions are met. However, due to the interference characteristics of the filter itself, its passband range varies with the incident angle of light. Under the condition of abnormal angle incidence, the passband of the optical filter deviates from the wavelength range of the useful color light signal and is positioned in the transition band with adjacent color light or on the adjacent color light, so that the attenuation of the useful color light signal or the interference of the adjacent color light is caused, and the performance of the system is greatly reduced. In addition, in future visible light communication networks, which are also white light lamps, the spectrum components may be different, some are RGB three-color spectrums, some are RGBA four-color spectrums, even spectrums composed of large-scale multi-color light, and the shapes of single-color spectrums of the same color light may also be different. At present, the receiving method based on the specific multicolor filter can only meet the receiving requirement of the specific multicolor spectrum signal, and the universality of the multicolor spectrum signal receiving is difficult to realize.
Aiming at the problems, it is important to design a general receiving method which can meet different incident angles and different multi-color spectral components.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the problems that in the existing visible light communication, due to the interference characteristic of an optical filter, the passband range can be changed along with the incident angle of light, and under the condition of abnormal incident angle, the passband of the optical filter can deviate from the wavelength range of a useful color light signal and is positioned in a transition band with adjacent color light or on the adjacent color light, so that the useful color light signal is attenuated or the adjacent color light is interfered, and the performance of a system is greatly reduced.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a method for receiving a polychromatic optical signal based on an overlapping cover filter set, comprising the steps of: in the case of multi-color visible light communications,
s1: considering a system with the number of color lights being M, uniformly dividing a visible light frequency range into (N +1)/2 intervals;
s2: on the basis that a rectangular passband optical filter is adopted in each frequency band interval, 1 same rectangular passband optical filter is added at the contact position of every two adjacent optical filters, and the added rectangular passband optical filter and the left and right optical filters are respectively overlapped by half, so that an optical filter set overlapped and covered by the visible light frequency band is formed, wherein the total number of the optical filters is N;
s3: for M colored lights, weighting and combining the signals received by the N optical filters by using M different weight vectors respectively to obtain M paths of combined colored light signals;
s4: and carrying out subsequent detection on the color light signals after the M paths of combination to restore the original sending signals.
Further, in step S1, the system of M color light is three color light RGB, four color light RGBA or large-scale multi-color light system, and the wavelength range of the visible light frequency band [380,780] is uniformly divided into (N +1)/2 intervals, where N is a positive odd number.
Further, in step S2, each interval uses one rectangular passband filter, on this basis, 1 same rectangular passband filter is added at each contact of 2 adjacent filters, the added rectangular passband filter and the left and right filters are respectively overlapped by half, thereby forming a filter set covered by overlapping in visible light frequency band, the total number of filters is N, wherein the left and right boundaries α of the passband of the ith filter are Ni、βiAre respectively as
Figure BDA0001774604710000021
According to the inherent interference characteristic of the filter, when the incident angle is deflected to theta, the left and right boundaries alpha of the ith filter pass bandi(θ)、βi(theta) is changed into
Figure BDA0001774604710000022
In the formula (2), n0Is the equivalent refractive index of air, neffIs the equivalent refractive index of the filter.
Further, in step S3, M different weight vectors w are used for M color lights, respectivelyj(wjIs vector of Nx 1 dimension, j is 1, …, M), the signals received by N optical filters are weighted and combined to obtain M paths of combined color light signals, wherein the obtained j is0Road signal
Figure BDA0001774604710000024
Comprises the following steps:
Figure BDA0001774604710000023
wherein:
Figure BDA00017746047100000310
denotes the j (th)0Original transmission signal of individual color light with variance of
Figure BDA0001774604710000031
Figure BDA00017746047100000311
Indicating j-th from the transmitting end0Channel gain vector of the color light to N filters at receiving end, wherein
Figure BDA00017746047100000312
Indicating j-th from the transmitting end0The channel gain of the i-th filter from the color light to the receiving end can be estimated by using pilot frequency in the practical system
Figure BDA00017746047100000313
A value of (d);
xjand hj＝[h1j,h2j,…,hNj]T(j≠j0) Original transmission signals and channel gain vectors representing the remaining M-1 interfering color lights;
z＝[z1,z2,…,zN]Trepresenting the channel noise vector, wherein zi(i-1, …, N) represents additive white gaussian noise corresponding to the ith filter, and autocorrelationThe matrix is
Figure BDA0001774604710000032
Where e { · } denotes expectation,
Figure BDA0001774604710000033
is the noise variance of each path INIs an identity matrix;
Figure BDA00017746047100000314
indicating that j is the number of combinations0Filter weight vector for individual color light signal, wherein
Figure BDA00017746047100000315
Indicating that j is the number of combinations0The weight of the ith filter in the case of individual color light signals is optimal
Figure BDA0001774604710000034
Is a matrix
Figure BDA0001774604710000035
The eigenvector corresponding to the largest eigenvalue can be obtained in real time according to the pilot frequency estimation
Figure BDA00017746047100000316
And hj(j≠j0) To calculate the optimum
Figure BDA0001774604710000036
Further, in step S4, the combined M-channel signals are subsequently detected to restore the original transmission signal, wherein the jth signal is0The signal-to-interference-and-noise ratio (SINR) in the detection of the channel signal is
Figure BDA0001774604710000037
Is most preferred
Figure BDA0001774604710000038
Corresponding to
Figure BDA00017746047100000317
Is a matrix
Figure BDA0001774604710000039
The largest eigenvalue.
Has the advantages that: the multicolor optical signal receiving method based on the overlapped covering filter set in the multicolor visible light communication can collect all signals of spectral components of any color light at any incident angle, fully utilizes the collected energy through optimal weighting and combining, further completes the detection of the multicolor optical signals and realizes the universality of multicolor optical signal receiving.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 shows the shape of the polychromatic spectrum and the shape of the pass band of the overlap coverage filter set in the case that the number of colored lights is M-3;
fig. 3 shows the shape of the polychromatic spectrum and the shape of the pass band of the overlap coverage filter set in the case that the number of color lights is M-4;
fig. 4 shows the shape of the polychromatic spectrum and the shape of the pass band of the overlap-cover filter set in the case where the number of color lights is M-7;
FIG. 5 is a diagram illustrating the performance comparison between the present invention and a conventional RGB-based tristimulus filter receiving method;
FIG. 6 is a diagram illustrating the performance comparison between the present invention and a conventional receiving method based on RGBA four-color filters;
fig. 7 is a diagram illustrating the comparison of the performance of the receiving method according to the present invention and the conventional seven-color filter-based receiving method.
Detailed Description
The technical scheme of the invention is further described in the following by combining the drawings and the detailed description.
The present embodiment discloses a method for receiving a multicolor optical signal based on an overlapped-cover filter set, as shown in fig. 1, including the following steps: in the case of multi-color visible light communications,
s1: considering a system with the number of color lights being M, uniformly dividing a visible light frequency range into (N +1)/2 intervals;
s2: on the basis that a rectangular passband optical filter is adopted in each frequency band interval, 1 same rectangular passband optical filter is added at the contact position of every two adjacent optical filters, and the added rectangular passband optical filter and the left and right optical filters are respectively overlapped by half, so that an optical filter set overlapped and covered by the visible light frequency band is formed, wherein the total number of the optical filters is N;
s3: for M colored lights, weighting and combining the signals received by the N optical filters by using M different weight vectors respectively to obtain M paths of combined colored light signals;
s4: and carrying out subsequent detection on the color light signals after the M paths of combination to restore the original sending signals.
In step S1, for a system in which the number of one color light is M, we consider the case where M is 3, 4, and 7, respectively, and the shape of the polychromatic spectrum is as shown by the solid line "-" in fig. 2 to 4, and the wavelength range of the visible light band [380,780] is uniformly divided into (N +1)/2 intervals, where N is 15 and the number of intervals is 8.
In step S2, each interval uses a filter with a rectangular passband, as shown by the dotted line "- -" in fig. 2 to 4, the corresponding number of filters is 8, on this basis, 1 filter with the same rectangular passband is added between every two adjacent filters, the passband and the left and right filters are respectively overlapped by half, as shown by the dotted line "…" in fig. 2 to 4, the corresponding number of filters is 7, thereby forming a filter set with overlapping coverage of visible light frequency bands, the total number of filters is 15, wherein the left and right boundaries α of the passband of the ith filter are 15i、βiAre respectively as
αi＝380+25(i-1),βi＝380+25(i+1)
According to the inherent interference characteristic of the filter, when the incident angle is deflected to theta, the left and right boundaries alpha of the ith filter pass bandi(θ)、βi(theta) is changed into
Figure BDA0001774604710000051
In the formula (2), n0Is the equivalent refractive index of air and takes 1, neffThe equivalent refractive index of the filter is 2.
In step S3, M different weight vectors w are used for M different color lightsj(wjIs vector of Nx 1 dimension, j is 1, …, M), the signals received by N optical filters are weighted and combined to obtain M paths of combined color light signals, wherein, the j is0Signals of the way
Figure BDA00017746047100000514
Comprises the following steps:
Figure BDA0001774604710000052
wherein:
xj0denotes the j (th)0The original transmission signal of the individual color light has a variance of
Figure BDA0001774604710000053
Where P is the total transmit power, taking the value of 4W,
Figure BDA00017746047100000515
is jth0Proportion of individual colors, where equal power distribution is considered, i.e.
Figure BDA00017746047100000516
Figure BDA0001774604710000054
Indicating j-th from the transmitting end0Channel gain vector of the color light to N filters at receiving end, wherein
Figure BDA0001774604710000055
Indicating j-th from the transmitting end0The channel gain of the i-th filter from the color light to the receiving end can be estimated by using pilot frequency in the practical system
Figure BDA00017746047100000517
A value of (d);
xjand hj＝[h1j,h2j,…,hNj]T(j≠j0) Original sending signals and channel gain vectors representing the other M-1 paths of interference color light;
z＝[z1,z2,…,zN]Trepresenting the channel noise vector, wherein zi(i-1, …, N) represents additive white gaussian noise corresponding to the ith filter, and the autocorrelation matrix is
Figure BDA0001774604710000056
Where e { · } denotes expectation,
Figure BDA0001774604710000057
for each path, the noise variance is taken as
Figure BDA0001774604710000058
ΙNIs an identity matrix;
Figure BDA0001774604710000059
indicating that j is the number of combinations0Filter weight vector for individual color light signal, wherein
Figure BDA00017746047100000510
Indicating that j is the number of combinations0The weight of the ith filter in the case of individual color light signals is optimal
Figure BDA00017746047100000511
Is a matrix
Figure BDA00017746047100000512
Maximum eigenvalue correspondenceCan be estimated in real time according to the pilot frequency to obtain hj0And hj(j≠j0) To calculate the optimum
Figure BDA00017746047100000513
In step S4, the combined M-channel color light signals are detected subsequently to restore the original transmission signal, wherein the jth color light signal is0The signal-to-interference-and-noise ratio (SINR) in the detection of the color light signal is
Figure BDA0001774604710000061
Is most preferred
Figure BDA0001774604710000062
Corresponding SINRj0Is a matrix
Figure BDA0001774604710000063
The largest eigenvalue.
By calculation, the proposed method for receiving a multicolor optical signal based on an overlapped-cover filter set is that the SINR changes with the incident angle of light (AoI) as shown by the symbol "mitsunit" in fig. 5 to 7, respectively, for the case where the number of color lights is 3, 4, and 7. In addition, we take the receiving methods corresponding to the traditional three-color, four-color and seven-color filters as the comparison objects,
the specific parameters of the filter are as follows:
table 1 multicolor filter parameters in conventional receiving method
Figure BDA0001774604710000064
In the table data (α, β), left and right boundary values indicating the pass band of the filter are included. The SINR of the receiving methods corresponding to the conventional three-color, four-color, and seven-color filters varies with the incident angle of the light (AoI) as shown by "+ + + + +" in fig. 5-7.
As can be seen in FIGS. 5-7:
(1) when AoI changes from 0 degrees to 30 degrees, the proposed multi-color optical signal receiving method based on the overlapping covering filter set keeps stable SINR performance all the time, while the SINR performance of the conventional receiving method based on the three-color light RGB, the four-color light RGBA and the seven-color light filter is reduced when AoI deflects greatly, and compared with the prior art, the proposed multi-color optical signal receiving method based on the overlapping covering filter set has stronger universality under the condition of movement.
(2) The multicolor light signal receiving method based on the overlapped covering filter set by using a set of overlapped covering filters realizes the receiving of three-color light RGB, four-color light RGBA and seven-color light signals at the emitting end, while the traditional method needs three sets of different multicolor filters to complete the receiving, and compared with the prior art, the multicolor light signal receiving method based on the overlapped covering filter set has stronger universality on the color light spectrum.
Therefore, the multi-color optical signal receiving method based on the overlapping covering filter set can keep stable performance under the conditions of different incidence angles and different color light spectral components, and achieves universality of signal receiving.

Claims (4)

1. A universal receiver based on overlapping coverage filter sets in multi-color visible light communications, characterized by: the method comprises the following steps:
s1: considering a system with the number of color lights being M, uniformly dividing a visible light frequency range into (N +1)/2 intervals;
s2: each frequency band interval adopts a rectangular passband optical filter, on the basis, 1 same rectangular passband optical filter is added between every two adjacent optical filters, the passband and the left and right optical filters are respectively overlapped by half, so that an optical filter group with overlapped visible light frequency bands is formed, and the total number of the optical filters is N;
s3: for M colored lights, weighting and combining the signals received by the N optical filters by using M different weight vectors respectively to obtain M paths of combined colored light signals;
s4: carrying out subsequent detection on the M paths of combined color light signals to restore an original sending signal;
in step S2, each interval uses a rectangular passband filter, on the basis, 1 same rectangular passband filter is added between every two adjacent filters, the passband, the left filter and the right filter are respectively overlapped by half, thereby forming a filter set covered by overlapping visible light frequency bands, the total number of the filters is N, wherein the left and right boundaries α of the passband of the ith filter are Ni、βiAre respectively as
Figure FDA0003159749010000011
According to the interference characteristic of the filter, when the incidence angle is deflected to theta, the left and right boundaries alpha of the ith filter passbandi(θ)、βi(theta) is changed into
Figure FDA0003159749010000012
In the formula (2), n0Is the equivalent refractive index of air, neffIs the equivalent refractive index of the filter.
2. The receiver of claim 1, wherein the filter set comprises at least one of: in the step S1, considering an M-color light system, including three-color light RGB, four-color light RGBA, or a large-scale multi-color light system, the wavelength range of the visible light frequency band [380,780] is uniformly divided into (N +1)/2 intervals, where N is a positive odd number.
3. The receiver of claim 1, wherein the filter set comprises at least one of: in step S3, M different weight vectors w are used for M color lightsj，wjIs a vector of dimension Nx 1, j is 1, …, M, and the signals received by N filters are weighted and combined to obtainTo the combined M color light signals, wherein the j-th color light signal is obtained0Road signal
Figure FDA0003159749010000013
Comprises the following steps:
Figure FDA0003159749010000014
wherein:
Figure FDA0003159749010000021
denotes the j (th)0Original transmission signal of individual color light with variance of
Figure FDA0003159749010000022
Figure FDA0003159749010000023
Indicating j-th from the transmitting end0Channel gain vector of the color light to N filters at receiving end, wherein
Figure FDA0003159749010000024
Indicating j-th from the transmitting end0The channel gain of the i-th filter, i is 1, …, N, and can be estimated by pilot frequency in practical system
Figure FDA0003159749010000025
A value of (d);
xjand hj＝[h1j,h2j,…,hNj]TOriginal transmission signal and channel gain vector representing the remaining M-1 interfering color lights, j ≠ j0；
z＝[z1,z2,…,zN]TRepresenting the channel noise vector, wherein ziDenotes additive white gaussian noise corresponding to the ith filter, i is 1, …, N, self-phaseThe correlation matrix is
Figure FDA0003159749010000026
Wherein E {. denotes expectation,
Figure FDA0003159749010000027
is the noise variance of each path INIs an identity matrix;
Figure FDA0003159749010000028
indicating that j is the number of combinations0Filter weight vector for individual color light signal, wherein
Figure FDA0003159749010000029
Indicating that j is the number of combinations0The weight of the ith filter in the case of a single color light signal, i is 1, …, N, which is optimal
Figure FDA00031597490100000210
Is a matrix
Figure FDA00031597490100000211
The eigenvector corresponding to the largest eigenvalue can be obtained in real time according to the pilot frequency estimation
Figure FDA00031597490100000212
And hjTo calculate the optimum
Figure FDA00031597490100000213
j≠j0，
Figure FDA00031597490100000214
The square of the variance of the original transmission signal for the jth color light, j ≠ 1, …, M, and j ≠ j0，
Figure FDA00031597490100000215
Is jth0The square of the variance of the original transmitted signal of the individual color light.
4. A receiver of the generic type based on overlapping coverage filter sets as claimed in claim 3, wherein: in step S4, the combined M-channel signals are subsequently detected to restore the original transmission signal, wherein the jth signal is0The SINR during the detection of the channel signal is
Figure FDA00031597490100000216
Is most preferred
Figure FDA00031597490100000217
Corresponding to
Figure FDA00031597490100000218
Is a matrix
Figure FDA00031597490100000219
W is the eigenvector corresponding to the largest eigenvalue.
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