CN116318398A - Space constellation design method and related device based on MIMO-VLC - Google Patents
Space constellation design method and related device based on MIMO-VLC Download PDFInfo
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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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- 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
- H04B10/524—Pulse modulation
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- H04B10/54—Intensity modulation
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Abstract
The invention discloses a space constellation design method and a related device based on MIMO-VLC, and relates to the technical field of new-generation communication. The space constellation design method and the related device based on MIMO-VLC take the correlation between effective active groups into considerationMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of effective activation groups, the unipolar PAM symbols of each subspace are calculated to form a new unipolar PAM symbol set, therefore, all the effective activation groups can be allocated with different unipolar PAM symbols for bit mapping, the problem that the existing space constellation design method based on MIMO-VLC does not consider the characteristic that the MIMO-VLC channel has correlation is solved, and a plurality of activation components are arrangedThe same single-polarity PAM modulation symbol set is shared, so that the external mutual information output by the demapper is unreliable, and the performance of the GSM constellation system is affected.
Description
Technical Field
The invention relates to the technical field of new-generation communication, in particular to a space constellation design method and a related device based on MIMO-VLC.
Background
Visible light communication (Visible Light Communication, VLC) refers to the transmission of information using the visible band of wavelengths from 380 to 700nm as an information carrier. The transmitting end of the visible light communication system adopts a light emitting diode (Light Emitting Diode, LED) as a light source, transmits information through a visible light signal which is imperceptible to naked eyes and has high-speed bright and dark flickering, and the receiving end adopts a photodiode as a Photo Detector (PD), converts the light signal into a corresponding electric signal, and then carries out A/D conversion, demodulation, decoding and other processes on the electric signal to restore the transmitted information. Because the persistence of vision phenomenon of human eyes, the human eyes can not perceive the change of illumination light as long as the modulation frequency is high enough, and therefore, the LED is used for communication and the illumination function of the LED is not affected.
In visible light communication, there are commonly used digital modulation methods such as On-Off keying (OOK), pulse-Position Modulation (PPM), and Pulse-amplitude modulation (PAM). However, these digital modulation schemes have the disadvantage of low spectral efficiency. To solve this problem, a generalized spatial modulation technique (Generalized Spatial Modulation, GSM) is widely used in visible light communication. Generalized spatial modulation in visible light combines MIMO technology with digital modulation technology and activates multiple LEDs simultaneously at any instant to transmit information. MIMO is multiple-input multiple-output, and is known as MultipleInput Multiple Output. MIMO-VLC systems can be a ready-to-use optical communication multiple-input multiple-output system. The generalized spatial modulation technique can improve the spectral efficiency of the system, since the index of the activated LED can carry additional bit information.
The existing GSM constellation design is that multiple active LED groups share the same unipolar M-PAM modulation symbol set. Let m=2 be the example, assuming that the MIMO-VLC system has 4 LEDs and 4 PDs, and 2 LEDs are activated simultaneously, thenThe system effective LED active groups are set as (1, 2), (1, 3), (2, 4), the existing GSM constellation design scheme is that 4 effective LED active groups share the same unipolar 2-PAM modulation symbol set
. The spatially collaborative GSM constellation is a GSM constellation proposed to minimize the power of signal domain or unipolar PAM modulation symbols, the mapping scheme of this constellation is that the set of modulation symbols of the active set (1, 2) is +>
The modulation symbol set of the active set (1, 3) is +.>
The modulation symbol set of the active set (2, 3) is +.>
The modulation symbol set of the active set (2, 4) is +.>
. The constellation design scheme of the plurality of effective LED active groups sharing the same unipolar M-PAM modulation symbol set does not consider the characteristic that the MIMO-VLC channels have correlation, but in the MIMO-VLC system, because each active group has certain correlation, the plurality of active groups sharing the same unipolar M-PAM modulation symbol set can make external mutual information output by a demapper unreliable, thereby affecting the performance of the GSM constellation system.
Disclosure of Invention
The invention provides a space constellation design method and a related device based on MIMO-VLC, which are used for solving the technical problems that the existing space constellation design method based on MIMO-VLC does not consider the characteristic that MIMO-VLC channels have relativity, and a plurality of active groups share the same unipolar PAM modulation symbol set, so that external mutual information output by a demapper is unreliable, and the performance of a GSM constellation system is influenced.
In view of this, a first aspect of the present invention provides a spatial constellation design method based on MIMO-VLC, comprising:
acquiring an active set, an active set number, and an active set number for a MIMO-VLC systemMA set of order single-polarity PAM symbols, wherein,Min order to be able to modulate the order of the modulation,
，mfor the number of bits of the tag,Mthe symbol space of the elements in the order unipolar PAM symbol set is
，/>
An average light intensity emitted for each LED;
will beMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of an effective activation group, unipolar PAM symbols of each subspace are calculated according to a symbol calculation formula, a new unipolar PAM symbol set is formed, and the symbol calculation formula is as follows:
wherein ,
for the selected unipolar PAM symbol index in the current operating subspace, +.>
，/>
For the subspace index of the current operation, +.>
The +.f. for the new unipolar PAM symbol set>
Element(s)>
For a valid active set number;
allocating a different unipolar PAM symbol subset for each active set according to the new unipolar PAM symbol set;
based on the single-polarity PAM symbol subset allocation result of each effective active group, the signal domain bit selects the single-polarity PAM symbol subset of the corresponding effective active group according to the space domain index for mapping.
A second aspect of the present invention provides a spatial constellation design apparatus based on MIMO-VLC, comprising:
a data acquisition module for acquiring an effective active set, an effective active set number and an effective active set number of the MIMO-VLC systemMA set of order single-polarity PAM symbols, wherein,Min order to be able to modulate the order of the modulation,
，mfor the number of bits of the tag,Mthe symbol space of the element in the order unipolar PAM symbol set is +.>
，/>
An average light intensity emitted for each LED;
a new symbol set construction module for constructingMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of an effective activation group, unipolar PAM symbols of each subspace are calculated according to a symbol calculation formula, a new unipolar PAM symbol set is formed, and the symbol calculation formula is as follows:
wherein ,
for the selected unipolar PAM symbol index in the current operating subspace, +.>
，/>
Sub-empty for current operationIndex between (I/O)>
The +.f. for the new unipolar PAM symbol set>
Element(s)>
For a valid active set number;
a symbol subset allocation module, configured to allocate a different unipolar PAM symbol subset to each active group according to the new unipolar PAM symbol set;
and the mapping module is used for selecting the unipolar PAM symbol subset of the corresponding effective active group according to the spatial domain index to map based on the unipolar PAM symbol subset allocation result of each effective active group.
A third aspect of the present invention provides a MIMO-VLC based spatial constellation design apparatus, said apparatus comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the spatial constellation design method based on MIMO-VLC according to the first aspect according to the instructions in the program code.
A fourth aspect of the present invention provides a computer-readable storage medium storing program code for executing the MIMO-VLC based spatial constellation design method according to the first aspect.
From the above technical solutions, the embodiment of the present invention has the following advantages:
the space constellation design method based on MIMO-VLC considers the correlation between effective active groupsMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of effective activation groups, the unipolar PAM symbols of each subspace are calculated to form a new unipolar PAM symbol set, and therefore, all the effective activation groups can be allocated with different unipolar PAM symbolsThe row bit mapping improves the performance of the GSM constellation system, and solves the technical problems that the existing space constellation design method based on MIMO-VLC does not consider the characteristic that the MIMO-VLC channels have correlation, and a plurality of active groups share the same unipolar PAM modulation symbol set, so that the external mutual information output by a demapper is unreliable, and the performance of the GSM constellation system is influenced.
The spatial constellation design related device based on MIMO-VLC provided by the invention is used for executing the spatial constellation design method based on MIMO-VLC provided by the invention, and the principle and the obtained technical effect are the same as those of the spatial constellation design method based on MIMO-VLC provided by the invention, and are not repeated here.
Drawings
For a clearer description of embodiments of the invention or of solutions according to the prior art, the figures which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the figures in the description below are only some embodiments of the invention, from which, without the aid of inventive efforts, other relevant figures can be obtained for a person skilled in the art.
Fig. 1 is a schematic flow chart of a spatial constellation design method based on MIMO-VLC according to an embodiment of the present invention;
FIG. 2 is a diagram showing bit error performance of a MIMO-VLC system according to different GSM constellation designs provided in the present invention;
fig. 3 is a schematic structural diagram of a spatial constellation design device based on MIMO-VLC according to an embodiment of the present invention.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For ease of understanding, referring to fig. 1, an embodiment of a spatial constellation design method based on MIMO-VLC according to the present invention includes:
In the embodiment of the present invention, the effective active set, the number of the effective active sets and the number of the effective active sets of the MIMO-VLC system are first determinedMA set of order unipolar PAM symbols. Assuming that the MIMO-VLC system has 4 LEDs and 4 PDs, and 2 LEDs are activated simultaneously, the active LED activation groups of the system are (1, 2), (1, 3), (2, 3), and (2, 4). Assume aMThe first order single polarity PAM symbol set is
，/>
，mFor the number of tag bits, the number of active set is +.>
。MThe symbol space of the element in the order unipolar PAM symbol set is +.>
I.e.MElement in a first order unipolar PAM symbol set +.>
。
wherein ,
for the selected unipolar PAM symbol index in the current operating subspace, +.>
，/>
For the subspace index of the current operation, +.>
The +.f. for the new unipolar PAM symbol set>
Element(s)>
To effectively activate the group number.
It should be noted thatMOrder unipolar PAM symbol set
Each symbol space +.>
Dividing into the number of active groups>
Subspace, i.e.)>
. Then, a single for each subspace is calculated according to the rule defined by the following formulaPolar PAM symbol:
wherein ,
for the selected unipolar PAM symbol index in the current operating subspace, +.>
，/>
For the subspace index of the current operation, +.>
The +.f. for the new unipolar PAM symbol set>
Element(s)>
To effectively activate the group number.
A new unipolar PAM symbol set can thus be generated:
。
to be used forM=2 and 
For example, =4, based on the above procedure, a new unipolar PAM symbol set can be obtained:
Note that, when a new unipolar PAM symbol set is obtained:
thereafter, a different unipolar PAM symbol subset is assigned to all active groups. For example, the subset of unipolar symbols that may be selected by the active sets (1, 2), (1, 3), (2, 3), and (2, 4), respectively, are: />
、/>
、/>
and />
。
After the allocation of different unipolar PAM symbol subsets to each active set is completed, signal domain bits are mapped by selecting the unipolar PAM symbol subset of the corresponding active set according to the spatial domain index according to the allocation result, so as to obtain a new GSM constellation. In this GSM constellation design, the active set has different unipolar PAM symbol subsets.
In order to better illustrate the superiority of the new GSM constellation obtained by the spatial constellation design method based on MIMO-VLC provided in the embodiment of the present invention, the new GSM constellation obtained in the present invention is compared with the conventional GSM constellation design scheme and the collaborative GSM constellation design scheme. Selecting an AR4JA original model image code as an error correction code, wherein the code rate is a basic matrix of the AR4JA code of-1/2
Can be expressed as:
the PEXIT algorithm is used to evaluate the performance of the AR4JA master codeword under each interleaving scheme, taking into account the 2-PAM modulation, and the measured decoding threshold is shown in table 1.
As can be seen from table 1, the decoding threshold value of the AR4JA master pattern in the designed new GSM constellation scheme is the smallest, which indicates that the AR4JA master pattern has better waterfall performance in the new GSM constellation scheme proposed by the present invention than in the existing two GSM constellation schemes.
Based on different GSM constellation mapping schemes, carrying out bit error performance simulation on an MIMO-VLC system on AR4JA original model code words with the code rate of-1/2, wherein the simulation result is shown in figure 2,M=2, the transmission codeword length is 7200, BP iteration number is 20, and outer iteration is 8, using BP decoding algorithm.
As can be seen from fig. 2, the new GSM constellation design scheme provided by the present invention has better bit error performance than the existing two GSM constellation designs, which indicates that in the MIMO-VLC system, mapping of all active groups using different unipolar PAM symbol subsets improves the GSM constellation system performance significantly.
The space constellation design method based on MIMO-VLC considers the correlation between effective active groupsMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of effective activation groups, the unipolar PAM symbols of each subspace are calculated to form a new unipolar PAM symbol set, therefore, all the effective activation groups can be allocated with different unipolar PAM symbols to carry out bit mapping, the performance of a GSM constellation system is improved, the technical problem that the existing MIMO-VLC-based space constellation design method does not consider the characteristic that MIMO-VLC channels have correlation, and a plurality of activation groups share the same unipolar PAM modulation symbol set, so that external mutual information output by a demapper is unreliable and the performance of the GSM constellation system is influenced is solved.
For ease of understanding, referring to fig. 3, an embodiment of a spatial constellation design system based on MIMO-VLC according to the present invention includes:
a data acquisition module for acquiring an effective active set, an effective active set number and an effective active set number of the MIMO-VLC systemMA set of order single-polarity PAM symbols, wherein,Min order to be able to modulate the order of the modulation,
，mfor the number of bits of the tag,Mthe symbol space of the element in the order unipolar PAM symbol set is +.>
，/>
An average light intensity emitted for each LED;
a new symbol set construction module for constructingMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of an effective activation group, unipolar PAM symbols of each subspace are calculated according to a symbol calculation formula, a new unipolar PAM symbol set is formed, and the symbol calculation formula is as follows:
wherein ,
for the selected unipolar PAM symbol index in the current operating subspace, +.>
，/>
For the subspace index of the current operation, +.>
The +.f. for the new unipolar PAM symbol set>
Element(s)>
For a valid active set number;
a symbol subset allocation module, configured to allocate a different unipolar PAM symbol subset to each active group according to the new unipolar PAM symbol set;
and the mapping module is used for selecting the unipolar PAM symbol subset of the corresponding effective active group according to the spatial domain index to map based on the unipolar PAM symbol subset allocation result of each effective active group.
Also provided in the present invention is an embodiment of a MIMO-VLC based spatial constellation design apparatus, comprising a processor and memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the spatial constellation design method based on MIMO-VLC provided in the present invention according to the instructions in the program code.
Also provided in the present invention is an embodiment of a computer-readable storage medium for storing program code for performing the MIMO-VLC based spatial constellation design method provided in the present invention.
The spatial constellation design device, the device and the computer readable storage medium based on the MIMO-VLC provided by the invention are used for executing the spatial constellation design method based on the MIMO-VLC provided by the invention, and the principle and the obtained technical effect are the same as those of the spatial constellation design method based on the MIMO-VLC provided by the invention, and are not repeated herein.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A spatial constellation design method based on MIMO-VLC, comprising:
acquiring an active set, an active set number, and an active set number for a MIMO-VLC systemMA set of order single-polarity PAM symbols, wherein,Min order to be able to modulate the order of the modulation,
，mfor the number of bits of the tag,Mthe symbol space of the element in the order unipolar PAM symbol set is +.>
，/>
An average light intensity emitted for each LED;
will beMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of an effective activation group, unipolar PAM symbols of each subspace are calculated according to a symbol calculation formula, a new unipolar PAM symbol set is formed, and the symbol calculation formula is as follows:
wherein ,
for the selected unipolar PAM symbol index in the current operating subspace, +.>
，/>
For the subspace index of the current operation, +.>
The +.f. for the new unipolar PAM symbol set>
Element(s)>
For a valid active set number;
allocating a different unipolar PAM symbol subset for each active set according to the new unipolar PAM symbol set;
based on the single-polarity PAM symbol subset allocation result of each effective active group, the signal domain bit selects the single-polarity PAM symbol subset of the corresponding effective active group according to the space domain index for mapping.
2. A MIMO-VLC based spatial constellation design apparatus, comprising:
a data acquisition module for acquiring an effective active set, an effective active set number and an effective active set number of the MIMO-VLC systemMA set of order single-polarity PAM symbols, wherein,Min order to be able to modulate the order of the modulation,
，mfor the number of bits of the tag,Mthe symbol space of the element in the order unipolar PAM symbol set is +.>
，/>
An average light intensity emitted for each LED;
a new symbol set construction module for constructingMEach symbol space in the first-order unipolar PAM symbol set is divided into a plurality of subspaces of an effective activation group, unipolar PAM symbols of each subspace are calculated according to a symbol calculation formula, a new unipolar PAM symbol set is formed, and the symbol calculation formula is as follows:
wherein ,
for the selected unipolar PAM symbol index in the current operating subspace, +.>
，/>
For the subspace index of the current operation, +.>
The +.f. for the new unipolar PAM symbol set>
Element(s)>
For a valid active set number;
a symbol subset allocation module, configured to allocate a different unipolar PAM symbol subset to each active group according to the new unipolar PAM symbol set;
and the mapping module is used for selecting the unipolar PAM symbol subset of the corresponding effective active group according to the spatial domain index to map based on the unipolar PAM symbol subset allocation result of each effective active group.
3. A MIMO-VLC based spatial constellation design device, said device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the MIMO-VLC based spatial constellation design method according to claim 1 in accordance with instructions in the program code.
4. A computer-readable storage medium storing program code for performing the MIMO-VLC based spatial constellation design method according to claim 1.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080107202A1 (en) * | 2006-11-07 | 2008-05-08 | Samsung Electronics Co.; Ltd | Multiple-input multiple-output communication system |
| CN108631832A (en) * | 2018-05-14 | 2018-10-09 | 中山大学 | In conjunction with the multiuser MIMO-OOFDM visible light communication methods of index modulation |
| WO2023002058A1 (en) * | 2021-07-23 | 2023-01-26 | Continental Automotive Technologies GmbH | Optimal index vector selection method for spatial modulation |
-
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- 2023-05-22 CN CN202310574320.7A patent/CN116318398A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080107202A1 (en) * | 2006-11-07 | 2008-05-08 | Samsung Electronics Co.; Ltd | Multiple-input multiple-output communication system |
| CN108631832A (en) * | 2018-05-14 | 2018-10-09 | 中山大学 | In conjunction with the multiuser MIMO-OOFDM visible light communication methods of index modulation |
| WO2023002058A1 (en) * | 2021-07-23 | 2023-01-26 | Continental Automotive Technologies GmbH | Optimal index vector selection method for spatial modulation |
Non-Patent Citations (1)
| Title |
|---|
| LIN DAI等: "Design of Protograph LDPC-Coded MIMO-VLC Systems with Generalized Spatial Modulation", ARXIV, pages 1 - 28 * |
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