CN116260502A - Double-domain index modulation communication method based on reconfigurable intelligent surface - Google Patents

Double-domain index modulation communication method based on reconfigurable intelligent surface Download PDF

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CN116260502A
CN116260502A CN202310543166.7A CN202310543166A CN116260502A CN 116260502 A CN116260502 A CN 116260502A CN 202310543166 A CN202310543166 A CN 202310543166A CN 116260502 A CN116260502 A CN 116260502A
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matrix
rectangular
representing
intelligent surface
index modulation
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CN116260502B (en
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王仁丁
冯宇
王亮
章鹏
金小萍
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Zhejiang Shannon Communication Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract

The invention relates to the technical field of mobile communication, and discloses a double-domain index modulation communication method based on a reconfigurable intelligent surface, which comprises the following steps: and deploying a reconfigurable intelligent surface between the base station and the mobile terminal, constructing a rectangular differential reflection space, mapping bit information into a transmission signal of the rectangular differential reflection space, decoding a receiving signal of the rectangular differential reflection space, and recovering the bit information. The invention realizes a dual-domain joint index modulation multi-input multi-output communication system of 'reflection and space' by jointly mapping the activated transmitting antenna and the reflection mode of the reconfigurable intelligent surface through the rectangular dispersion matrix. The rectangular differential reflection spatial modulation provided by the invention realizes low-complexity incoherent detection of a communication receiver by a rectangular differential coding method. The invention further improves the frequency spectrum efficiency and the communication reliability of the system by a digital wave beam forming method.

Description

Double-domain index modulation communication method based on reconfigurable intelligent surface
Technical Field
The invention relates to the technical field of mobile communication, in particular to a double-domain index modulation communication method based on a reconfigurable intelligent surface.
Background
Reconfigurable smart reflective surface technology is a key technology for new generation digital mobile communications. The reconfigurable smart surface consists of a large number of low cost near passive reflecting elements that can control the phase shift and amplitude gain of passive reflection of an incident electromagnetic wave with the help of an intelligent controller. Recently, reconfigurable intelligent surface aided index modulation techniques are a hotspot in academic research. The reconfigurable intelligent surface-assisted IM technology has high spectrum efficiency, low power consumption and simple hardware implementation, and has remarkable competition in a scheme of multi-input multi-output wireless communication. In recent researches, the reconfigurable intelligent surface technology is designed to improve the wireless communication channel condition, and meanwhile, index modulation information can be transmitted through the phase and amplitude characteristics of the reconfigurable intelligent surface under different states. The scheme of spatial modulation of the receiving end is provided, and the reconfigurable intelligent surface in-phase superimposes signals on a multipath channel, so that the received signal energy of a specific receiving antenna is obviously enhanced. The in-phase and quadrature phase shift mode of the reconfigurable intelligent surface carries extra bits through packet planning, and higher spectrum efficiency is achieved. The above solutions are all based on the reconfigurable intelligent surface being able to achieve continuous phase adjustment, which is however difficult to achieve in hardware. The proposed reflection modulation scheme takes different discrete phase reflection states of the reconfigurable intelligent surface as a new transmission entity of index modulation, and the base station and the reconfigurable intelligent surface controller can cooperatively transmit information and can independently transmit the respective information. In fact, the above schemes are all implemented by transmitting a large number of pilot signals to realize channel estimation, especially in the wireless communication assisted by the reconfigurable intelligent surface, the pilot overhead is far greater than that of the traditional dual-domain joint index modulation multiple-input multiple-output communication. For this purpose, additional information is transmitted without channel state information by designing an arrangement matrix that activates the different reflection modes. However, the arrangement matrix is designed as a square matrix, and as the number of reflection modes increases, the improvement of the spectrum efficiency is not significant, but the detection complexity of the receiving end increases exponentially. Furthermore, only one transmit antenna is deployed at the base station, which is not common with actual engineered base station deployments.
Disclosure of Invention
The invention aims to overcome one or more of the prior technical problems and provide a double-domain index modulation communication method based on a reconfigurable intelligent surface.
In order to achieve the above object, the present invention provides a dual-domain index modulation communication method based on a reconfigurable intelligent surface, including:
a reconfigurable intelligent surface is deployed between a base station and a mobile terminal, and a rectangular differential reflection space is constructed;
mapping bit information into a transmission signal of the rectangular differential reflection space;
and decoding the received signal of the rectangular differential reflection space to restore bit information.
According to one aspect of the invention, a channel matrix between a base station and a reconfigurable intelligent surface is constructed to obtain a first channel matrix and represent it as
Figure SMS_3
Constructing a channel matrix between the mobile terminal and the reconfigurable intelligent surface, obtaining a second channel matrix and representing the second channel matrix as +.>
Figure SMS_4
Constructing a channel matrix between the mobile terminal and the base station, obtaining a third channel matrix and representing it as +.>
Figure SMS_7
Integrating the first channel matrix, the second channel matrix and the third channel matrix to obtain an equivalent channel matrix and representing the equivalent channel matrix as +.>
Figure SMS_2
, wherein ,/>
Figure SMS_5
Indicating base station active +.>
Figure SMS_6
Root antenna assemblyAnd selecting +.>
Figure SMS_8
Equivalent channel vector in the case of the individual reflection modes, +.>
Figure SMS_1
Representing the transmitting antenna.
According to one aspect of the invention, the equivalent channel matrix is constructed by the formula,
Figure SMS_9
；
Figure SMS_10
；
Figure SMS_11
；
Figure SMS_12
；
Figure SMS_13
；
wherein ,
Figure SMS_14
representing the transformed second channel expansion matrix;
Figure SMS_15
representing a reflection mode aggregation matrix;
Figure SMS_16
representing the transformed first channel expansion matrix;
Figure SMS_17
after the representation is transformedA third channel expansion matrix of (a);
Figure SMS_18
a phase shift matrix representing the reflection mode;
Figure SMS_19
the representation dimension is +.>
Figure SMS_20
A unit array of (a);
Figure SMS_21
the representation dimension is +.>
Figure SMS_22
A unit array of (a);
Figure SMS_23
representation->
Figure SMS_24
Post-deployment->
Figure SMS_25
Columns.
According to one aspect of the invention, each transport block signal of the rectangular differential reflection space comprises
Figure SMS_26
One code word time slot, one frame signal occupies +.>
Figure SMS_27
One of the code word time slots, one frame signal contains +>
Figure SMS_28
Reference transport block and->
Figure SMS_29
And information transport blocks.
According to the inventionIn one aspect of each transport block signaling
Figure SMS_32
Information of one bit>
Figure SMS_34
A single bit is used to map a rectangular dispersion matrix>
Figure SMS_37
，/>
Figure SMS_31
A number of bits for mapping->
Figure SMS_35
Personal->
Figure SMS_38
Order phase shift keying symbol, will->
Figure SMS_40
The PSK symbols are stacked on the main diagonal as a square matrix>
Figure SMS_30
Rectangular dispersion matrix->
Figure SMS_33
Is a row of (1) representing a joint selection of active antennas and reconfigurable smart surface reflection modes, rectangular dispersion matrix +.>
Figure SMS_36
Is shown for the rectangular dispersion matrix +.>
Figure SMS_39
The partitioning is performed such that there is one and only one non-zero element modulo 1 in each row and column. />
According to one aspect of the invention, the rectangular differential reflection space has an information transmission matrix of
Figure SMS_42
Moment of index modulation signalForm differential modulation, emitted +.>
Figure SMS_45
The information transmission block of each is->
Figure SMS_48
, wherein ,/>
Figure SMS_43
For the information transport block of the previous transmission, < +.>
Figure SMS_44
To expand the operation function, the expansion operation function is applied>
Figure SMS_47
Expansion into a sparse unitary matrix +.>
Figure SMS_50
, wherein ,/>
Figure SMS_41
In order to shift the matrix to the right,
Figure SMS_46
for dimension +.>
Figure SMS_49
The rectangular differential coding is realized by expanding an operation function, wherein the formula is as follows,
Figure SMS_51
。
according to one aspect of the invention, the received first
Figure SMS_52
The number of transport blocks is->
Figure SMS_53
, wherein ,
Figure SMS_54
representing additive Gaussian whiteNoise, traversing legal codebook of information transmission matrix through maximum likelihood detection formula based on inverse operation of expansion operation function>
Figure SMS_55
Decoding is carried out, bit information is obtained through the coding mapping relation, wherein the formula is as follows,
Figure SMS_56
；
wherein ,
Figure SMS_57
indicate the%>
Figure SMS_58
Information transmission blocks;
Figure SMS_59
a valued function representing the time at which the whole is made minimum;
Figure SMS_60
representing the equivalent by iterative calculation +.>
Figure SMS_61
A plurality of received signals;
Figure SMS_62
representing the Frobenius norm operation;
reducing the effect of noise in the differential calculation, wherein the formula is,
Figure SMS_63
；
wherein ,
Figure SMS_64
indicating the +.o. of the reception after noise reduction>
Figure SMS_65
Information transmission blocks;
Figure SMS_66
a function representing a block diagonal matrix;
Figure SMS_67
representing forgetting factors;
Figure SMS_68
the representation dimension is +.>
Figure SMS_69
A unit array of (a);
Figure SMS_70
the representation dimension is +.>
Figure SMS_71
Is a full 0 square matrix.
To achieve the above object, the present invention provides a dual-domain index modulation communication system based on a reconfigurable intelligent surface, including:
rectangular differential reflection space construction module: a reconfigurable intelligent surface is deployed between a base station and a mobile terminal, and a rectangular differential reflection space is constructed;
and a signal sending module: mapping bit information into a transmission signal of the rectangular differential reflection space;
a signal receiving module: and decoding the received signal of the rectangular differential reflection space to restore bit information.
To achieve the above object, the present invention provides an electronic device, including a processor, a memory, and a computer program stored in the memory and executable on the processor, where the computer program when executed by the processor implements the above-mentioned two-domain index modulation communication method based on a reconfigurable intelligent surface.
To achieve the above object, the present invention provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the above-mentioned two-domain index modulation communication method based on a reconfigurable intelligent surface.
Based on the above, the invention has the beneficial effects that:
compared with the similar differential index modulation scheme, the rectangular dispersion matrix of the rectangular differential reflection space is non-square, so that the spectrum efficiency is effectively improved, the space-time mapping relation of a radio frequency chain is simplified, the detection complexity of a receiving end is greatly reduced, the rectangular differential reflection space has the advantages of low detection decoding complexity and high communication reliability, and the rectangular differential reflection space obtains better bit error rate performance and lower decoding detection complexity of the similar differential modulation scheme under the condition of realizing the same or higher spectrum efficiency.
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FIG. 1 schematically illustrates a flow chart of a two-domain index modulation communication method based on a reconfigurable intelligent surface in accordance with the present invention;
FIG. 2 is a schematic representation of a comparison of rectangular differential reflection space versus other reconfigurable intelligent surface-aided incoherent dual-domain joint index modulation multiple-input multiple-output communication schemes according to the present invention;
FIG. 3 is a schematic diagram showing a rectangular differential reflection space according to the present invention in comparison with decoding complexity of a receiving end according to other different schemes;
fig. 4 schematically shows a flow chart of a two-domain index modulation communication system based on a reconfigurable intelligent surface according to the present invention.
Detailed Description
The present disclosure will now be discussed with reference to exemplary embodiments, it being understood that the embodiments discussed are merely for the purpose of enabling those of ordinary skill in the art to better understand and thus practice the present disclosure and do not imply any limitation to the scope of the present disclosure.
As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The terms "based on" and "based at least in part on" are to be construed as "at least one embodiment.
Fig. 1 schematically illustrates a flow chart of a two-domain index modulation communication method based on a reconfigurable intelligent surface according to the present invention, as shown in fig. 1, the two-domain index modulation communication method based on a reconfigurable intelligent surface of the present invention includes:
a reconfigurable intelligent surface is deployed between a base station and a mobile terminal, and a rectangular differential reflection space is constructed;
mapping bit information into a transmission signal of the rectangular differential reflection space;
and decoding the received signal of the rectangular differential reflection space to restore bit information.
According to one embodiment of the invention, a channel matrix between a base station and a reconfigurable intelligent surface is constructed, a first channel matrix is obtained and expressed as
Figure SMS_74
Constructing a channel matrix between the mobile terminal and the reconfigurable intelligent surface, obtaining a second channel matrix and representing the second channel matrix as +.>
Figure SMS_75
Constructing a channel matrix between the mobile terminal and the base station, obtaining a third channel matrix and representing it as +.>
Figure SMS_77
Integrating the first channel matrix, the second channel matrix and the third channel matrix to obtain an equivalent channel matrix and representing the equivalent channel matrix as +.>
Figure SMS_73
, wherein ,/>
Figure SMS_76
Indicating base station active +.>
Figure SMS_78
Root antenna and select +.>
Figure SMS_79
Equivalent channel vector in the case of the individual reflection modes, +.>
Figure SMS_72
Representing the transmitting antenna.
According to one embodiment of the present invention, the equivalent channel matrix is constructed by the formula,
Figure SMS_80
；
Figure SMS_81
；
Figure SMS_82
；
Figure SMS_83
；
Figure SMS_84
；
wherein ,
Figure SMS_85
representing the transformed second channel expansion matrix;
Figure SMS_86
representing a reflection mode aggregation matrix;
Figure SMS_87
representing the transformed first channel expansion matrix;
Figure SMS_88
representing the transformed third channel expansion matrix;
Figure SMS_89
a phase shift matrix representing the reflection mode;
Figure SMS_90
the representation dimension is +.>
Figure SMS_91
A unit array of (a);
Figure SMS_92
the representation dimension is +.>
Figure SMS_93
A unit array of (a);
Figure SMS_94
representation->
Figure SMS_95
Post-deployment->
Figure SMS_96
Columns.
According to one embodiment of the present invention, each transport block signal of the rectangular differential reflection space comprises
Figure SMS_97
One code word time slot, one frame signal occupies +.>
Figure SMS_98
One of the code word time slots, one frame signal contains +>
Figure SMS_99
Reference transport block
Figure SMS_100
And information transport blocks.
According to one embodiment of the invention, each transport block is signaled
Figure SMS_102
Information of one bit>
Figure SMS_105
A single bit is used to map a rectangular dispersion matrix>
Figure SMS_108
，/>
Figure SMS_103
A number of bits for mapping->
Figure SMS_106
Personal->
Figure SMS_109
Order phase shift keying symbol, will->
Figure SMS_111
The PSK symbols are stacked on the main diagonal as a square matrix>
Figure SMS_101
Rectangular dispersion matrix->
Figure SMS_104
Is a row of (1) representing a joint selection of active antennas and reconfigurable smart surface reflection modes, rectangular dispersion matrix +.>
Figure SMS_107
Is shown for the rectangular dispersion matrix +.>
Figure SMS_110
The partitioning is performed such that there is one and only one non-zero element modulo 1 in each row and column.
According to one embodiment of the present invention, the rectangular differential reflection space has an information transmission matrix of
Figure SMS_114
Rectangular differential modulation is performed on the index modulation signal, and the transmitted +.>
Figure SMS_117
The information transmission block of each is->
Figure SMS_120
, wherein ,/>
Figure SMS_113
For the information transport block of the previous transmission, < +.>
Figure SMS_116
To expand the operation function, the expansion operation function is applied>
Figure SMS_119
Expansion into a sparse unitary matrix +.>
Figure SMS_121
, wherein ,/>
Figure SMS_112
In order to shift the matrix to the right,
Figure SMS_115
for dimension +.>
Figure SMS_118
The rectangular differential coding is realized by expanding an operation function, wherein the formula is as follows,
Figure SMS_122
。
according to one embodiment of the invention, the received first
Figure SMS_123
The number of transport blocks is->
Figure SMS_124
, wherein ,/>
Figure SMS_125
Representing additive Gaussian white noise, traversing a legal codebook of an information transmission matrix through a maximum likelihood detection formula based on inverse operation of an extended operation function>
Figure SMS_126
Decoding is carried out, bit information is obtained through the coding mapping relation, wherein the formula is as follows,
Figure SMS_127
；
wherein ,
Figure SMS_128
indicate the%>
Figure SMS_129
Information transmission blocks;
Figure SMS_130
a valued function representing the time at which the whole is made minimum;
Figure SMS_131
representing the equivalent by iterative calculation +.>
Figure SMS_132
A plurality of received signals;
Figure SMS_133
representing the Frobenius norm operation;
reducing the effect of noise in the differential calculation, wherein the formula is,
Figure SMS_134
；
wherein ,
Figure SMS_135
indicating the +.o. of the reception after noise reduction>
Figure SMS_136
Information transmission blocks;
Figure SMS_137
a function representing a block diagonal matrix;
Figure SMS_138
representing forgetting factors;
Figure SMS_139
the representation dimension is +.>
Figure SMS_140
A unit array of (a);
Figure SMS_141
the representation dimension is +.>
Figure SMS_142
Is a full 0 square matrix. />
FIG. 2 is a schematic diagram showing a comparison of performance of a rectangular differential reflection space according to the present invention and other reconfigurable intelligent surface-aided incoherent dual-domain joint index modulation MIMO communication scheme according to one embodiment of the present invention, as shown in FIG. 2, comparing the performance of different differential index modulation dual-domain joint index modulation MIMO communication schemes in
Figure SMS_143
，/>
Figure SMS_144
Bit error performance under simulation parameters, wherein the reconfigurable smart surfaces-RDSM and the reconfigurable smart surface-DSM are used only to enhance signals without passing any information. DRM-SM, RM-SM and R rectangular dispersion matrix SM scheme proposed by the invention simultaneously transmitThe transmit antenna and reconfigurable smart surface reflection mode transmit bit information. The number of codeword slots of the rectangular differential reflection space is set to +.>
Figure SMS_145
. Wherein, at the same spectral efficiency->
Figure SMS_146
At bpcu, the rectangular differential reflection space is improved by 6.5dB compared with the bit error performance of the reconfigurable intelligent surface-RDSM. The contrast spectral efficiency is only +.>
Figure SMS_147
The rectangular differential reflection space still has better bit error rate performance compared with the reconfigurable intelligent surface-DSM and DRM-SM scheme, and the bit error rate performance of the rectangular differential reflection space is only reduced by 3dB compared with that of the RM-SM scheme of coherent demodulation.
FIG. 3 is a schematic diagram showing a comparison of the rectangular differential reflection space according to the present invention with the decoding complexity of the receiving end of other different schemes, as shown in FIG. 3, in order to demonstrate the superiority of the rectangular differential reflection space in detecting complexity in the differential system, the transmission of the related scheme is compared
Figure SMS_149
The decoding detection and calculation complexity of each bit is characterized by the running time of the decoding program of the actual simulation CPU and the multiplication times of real numbers, wherein all schemes are in +.>
Figure SMS_152
，/>
Figure SMS_155
Under the condition of (1) and taking average value of 10 times of results, other simulation parameters
Figure SMS_150
The simulation parameters of the transmitting antenna, the reflection mode, the modulation order and the code word time slot are respectively represented. In order to be at the same spectral efficiency->
Figure SMS_153
Under the bpcu condition, RM, rectangular differential reflection space, DRM, and reconfigurable intelligent surface-DSM, simulation parameters of the rectangular differential reflection space (dual-domain joint index modulation multiple-input multiple-output) are respectively set to (1,4,4,1), (1,4,4,1), (1,4,4,1), (1,4,8,4), (4,1,8,4), (4,1,4,1), (4,2,2,1), under the parameters, DRM and the reconfigurable intelligent surface-DSM scheme of the rectangular dispersion matrix mapping into square matrix are compared, and decoding detection computational complexity of the SIMO scheme and the dual-domain joint index modulation multiple-input multiple-output scheme of the rectangular differential reflection space is about 0.1% of that of the DRM and the reconfigurable intelligent surface-DSM scheme. This is because the detection complexity in the reconfigurable smart surface-DSM and DRM schemes follows +.>
Figure SMS_156
Or->
Figure SMS_157
Increase and exponentially increase, whereas +.>
Figure SMS_148
The lower the detection complexity of the rectangular differential reflection space is, the more +.>
Figure SMS_151
Or->
Figure SMS_154
The more the increase is approaching a linear increase. Furthermore, the actual decoding detection time of the rectangular differential reflection space is twice that of RM. The theoretical value of the calculated decoding real number calculation complexity is basically positively correlated with the actual decoding time.
Furthermore, to achieve the above object, the present invention provides a dual-domain index modulation communication system based on a reconfigurable intelligent surface, fig. 4 schematically shows a flowchart of a dual-domain index modulation communication system based on a reconfigurable intelligent surface according to the present invention, and as shown in fig. 4, a dual-domain index modulation communication system based on a reconfigurable intelligent surface according to the present invention includes:
rectangular differential reflection space construction module: a reconfigurable intelligent surface is deployed between a base station and a mobile terminal, and a rectangular differential reflection space is constructed;
and a signal sending module: mapping bit information into a transmission signal of the rectangular differential reflection space;
a signal receiving module: and decoding the received signal of the rectangular differential reflection space to restore bit information.
In order to achieve the above object, the present invention also provides an electronic device including: the system comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the computer program is executed by the processor to realize the two-domain index modulation communication method based on the reconfigurable intelligent surface.
In order to achieve the above object, the present invention further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the above-mentioned two-domain index modulation communication method based on a reconfigurable intelligent surface.
Based on the above, compared with the similar differential index modulation scheme, the rectangular dispersion matrix of the rectangular differential reflection space is non-square, so that the spectrum efficiency is effectively improved, the space-time mapping relation of a radio frequency chain is simplified, the detection complexity of a receiving end is greatly reduced, the rectangular differential reflection space has the advantages of low detection decoding complexity and high communication reliability, and the rectangular differential reflection space obtains better bit error rate performance and lower decoding detection complexity of the similar differential modulation scheme under the condition of realizing the same or higher spectrum efficiency.
Those of ordinary skill in the art will appreciate that the modules and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and device described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment of the invention.
In addition, each functional module in the embodiment of the present invention may be integrated in one processing module, or each module may exist alone physically, or two or more modules may be integrated in one module.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method for energy saving signal transmission/reception of the various embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
It should be understood that, the sequence numbers of the steps in the summary and the embodiments of the present invention do not necessarily mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.

Claims (10)

1. The double-domain index modulation communication method based on the reconfigurable intelligent surface is characterized by comprising the following steps of:
a reconfigurable intelligent surface is deployed between a base station and a mobile terminal, and a rectangular differential reflection space is constructed;
mapping bit information into a transmission signal of the rectangular differential reflection space;
and decoding the received signal of the rectangular differential reflection space to restore bit information.
2. The method for two-domain index modulation communication based on reconfigurable intelligent surface according to claim 1, wherein a base is constructedChannel matrix between station and reconfigurable intelligent surface, first channel matrix is obtained and expressed as
Figure QLYQS_3
Constructing a channel matrix between the mobile terminal and the reconfigurable intelligent surface, obtaining a second channel matrix and representing the second channel matrix as +.>
Figure QLYQS_5
Constructing a channel matrix between the mobile terminal and the base station, obtaining a third channel matrix and representing it as +.>
Figure QLYQS_7
Integrating the first channel matrix, the second channel matrix and the third channel matrix to obtain an equivalent channel matrix and representing the equivalent channel matrix as +.>
Figure QLYQS_2
, wherein ,/>
Figure QLYQS_4
Indicating base station active +.>
Figure QLYQS_6
Root antenna and select +.>
Figure QLYQS_8
Equivalent channel vector in the case of the individual reflection modes, +.>
Figure QLYQS_1
Representing the transmitting antenna.
3. The method for two-domain index modulation communication based on reconfigurable intelligent surface according to claim 2, wherein the formula for constructing the equivalent channel matrix is as follows,
Figure QLYQS_9
；
Figure QLYQS_10
；
Figure QLYQS_11
；
Figure QLYQS_12
；
Figure QLYQS_13
；
wherein ,
Figure QLYQS_14
representing the transformed second channel expansion matrix;
Figure QLYQS_15
representing a reflection mode aggregation matrix;
Figure QLYQS_16
representing the transformed first channel expansion matrix;
Figure QLYQS_17
representing the transformed third channel expansion matrix;
Figure QLYQS_18
a phase shift matrix representing the reflection mode;
Figure QLYQS_19
the representation dimension is +.>
Figure QLYQS_20
A unit array of (a);
Figure QLYQS_21
the representation dimension is +.>
Figure QLYQS_22
A unit array of (a); />
Figure QLYQS_23
Representation->
Figure QLYQS_24
Post-deployment->
Figure QLYQS_25
Columns.
4. A method of two-domain index modulation communication based on a reconfigurable intelligent surface as claimed in claim 3, wherein each transport block signal of said rectangular differential reflection space comprises
Figure QLYQS_26
One code word time slot, one frame signal occupies +.>
Figure QLYQS_27
One of the code word time slots, one frame signal contains +>
Figure QLYQS_28
Reference transport block and->
Figure QLYQS_29
And information transport blocks.
5. The method of two-domain index modulation communication based on reconfigurable intelligent surface of claim 4, wherein each transport block is signaledNumber transmission
Figure QLYQS_31
Information of one bit>
Figure QLYQS_35
A single bit is used to map a rectangular dispersion matrix>
Figure QLYQS_36
，/>
Figure QLYQS_30
A number of bits for mapping->
Figure QLYQS_33
Personal->
Figure QLYQS_37
Order phase shift keying symbol, will->
Figure QLYQS_39
The PSK symbols are stacked on the main diagonal as a square matrix>
Figure QLYQS_32
Rectangular dispersion matrix->
Figure QLYQS_34
Is a row of a rectangular dispersion matrix representing a jointly selected active antenna and reconfigurable smart surface reflection mode
Figure QLYQS_38
Is shown for the rectangular dispersion matrix +.>
Figure QLYQS_40
The partitioning is performed such that there is one and only one non-zero element modulo 1 in each row and column.
6. A reconfigurable intelligent surface based system according to claim 5The double-domain index modulation communication method is characterized in that the rectangular differential reflection space information transmission matrix is
Figure QLYQS_42
Rectangular differential modulation is performed on the index modulation signal, and the transmitted +.>
Figure QLYQS_45
The information transmission block of each is->
Figure QLYQS_48
, wherein ,/>
Figure QLYQS_43
For the information transport block of the previous transmission, < +.>
Figure QLYQS_46
To expand the operation function, the expansion operation function is applied>
Figure QLYQS_49
Unitary matrix with sparsity
Figure QLYQS_50
, wherein ,/>
Figure QLYQS_41
Right shift matrix +.>
Figure QLYQS_44
For dimension +.>
Figure QLYQS_47
The rectangular differential coding is realized by expanding an operation function, wherein the formula is as follows,
Figure QLYQS_51
。
7. the method of claim 6, wherein the received first
Figure QLYQS_52
The number of transport blocks is->
Figure QLYQS_53
, wherein ,/>
Figure QLYQS_54
Representing additive Gaussian white noise, traversing a legal codebook of an information transmission matrix through a maximum likelihood detection formula based on inverse operation of an extended operation function>
Figure QLYQS_55
Decoding is carried out, bit information is obtained through the coding mapping relation, wherein the formula is as follows,
Figure QLYQS_56
；
wherein ,
Figure QLYQS_57
indicate the%>
Figure QLYQS_58
Information transmission blocks;
Figure QLYQS_59
a valued function representing the time at which the whole is made minimum;
Figure QLYQS_60
representing the equivalent by iterative calculation +.>
Figure QLYQS_61
A plurality of received signals;
Figure QLYQS_62
representing the Frobenius norm operation;
reducing the effect of noise in the differential calculation, wherein the formula is,
Figure QLYQS_63
；
wherein ,
Figure QLYQS_64
indicating the +.o. of the reception after noise reduction>
Figure QLYQS_65
Information transmission blocks;
Figure QLYQS_66
a function representing a block diagonal matrix;
Figure QLYQS_67
representing forgetting factors;
Figure QLYQS_68
the representation dimension is +.>
Figure QLYQS_69
A unit array of (a);
Figure QLYQS_70
the representation dimension is +.>
Figure QLYQS_71
Is a full 0 square matrix.
8. A reconfigurable intelligent surface-based two-domain index modulation communication system, comprising:
rectangular differential reflection space construction module: a reconfigurable intelligent surface is deployed between a base station and a mobile terminal, and a rectangular differential reflection space is constructed;
and a signal sending module: mapping bit information into a transmission signal of the rectangular differential reflection space;
a signal receiving module: and decoding the received signal of the rectangular differential reflection space to restore bit information.
9. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing a reconfigurable intelligent surface based two-domain index modulation communication method as claimed in any one of claims 1 to 7.
10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, the computer program when executed by a processor implementing a two-domain index modulation communication method based on a reconfigurable intelligent surface as claimed in any one of claims 1 to 7.
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