CN112491773B - Multi-standard signal modulation method based on intelligent reflection surface - Google Patents

Multi-standard signal modulation method based on intelligent reflection surface Download PDF

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CN112491773B
CN112491773B CN202011135144.XA CN202011135144A CN112491773B CN 112491773 B CN112491773 B CN 112491773B CN 202011135144 A CN202011135144 A CN 202011135144A CN 112491773 B CN112491773 B CN 112491773B
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modulation method
phase modulation
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CN112491773A (en
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温淼文
齐晓敏
李强
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South China University of Technology SCUT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3444—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power by applying a certain rotation to regular constellations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases

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Abstract

The invention discloses a multi-standard signal modulation method based on an intelligent reflection surface, which comprises the following steps: s1, grouping element units of the intelligent reflection surface, wherein each group of unit reflection channels have strong correlation; s2, splitting the bit information modulated by the intelligent reflection surface into two parts, wherein the bit information of the first part represents the adopted phase modulation method, and the bit information of the second part carries out information modulation according to the modulation method represented by the bit information of the first part; s3, determining the reflection phase of each grouping element of the intelligent reflection surface; s4, after receiving the information modulated by the intelligent reflection surface, the receiving end of the first time slot changes the modulation method represented by the bit information of the first part and transmits the same bit information again in the second time slot; and S5, demodulating the modulation information at the receiving end. The multi-standard signal modulation method based on the intelligent reflection surface can increase the transmitted bit information and improve the frequency spectrum efficiency of a communication system.

Description

Multi-standard signal modulation method based on intelligent reflection surface
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method for performing multi-standard phase modulation by using different groups of intelligent reflecting surface element units.
Background
The intelligent reflection surface is a promising technical scheme in the field of future wireless communication due to low cost, low energy consumption, convenient deployment and intelligent control of the reflection phase of an incident signal. With the increase of applicable scenes of the intelligent reflecting surface, the information such as the ambient environment state collected by the intelligent reflecting surface through a sensor of the intelligent reflecting surface is continuously increased, and how to transmit the information through the intelligent reflecting surface also becomes a research hotspot.
In order to transmit the information collected by the intelligent reflective surface, researchers have proposed modulating and transmitting the information by controlling the switching states of the intelligent reflective surface element units, or grouping the intelligent reflective surface element units and leaving a certain number of element units in each group in an off state. In both schemes, due to the presence of the smart reflective surface element unit in the off state, the whole smart reflective surface cannot obtain the whole gain, and the energy of the received signal is weakened. And the uncertainty of the change in the switching state of the intelligent reflective surface element cells also increases the complexity of the system. In recent studies, researchers have proposed grouping elements of intelligent reflective surfaces and orthogonalizing the reflective phases of different groups of intelligent reflective surfaces, but in this way each group of elements of an intelligent reflective surface group can only transmit a single bit of information.
Disclosure of Invention
The present invention is directed to solving the above-mentioned drawbacks of the prior art, and provides a method for performing multi-system phase modulation by using different groups of elements of an intelligent reflective surface in an intelligent reflective surface-assisted single-input single-output wireless system.
The purpose of the invention can be achieved by adopting the following technical scheme:
a multi-standard signal modulation method based on an intelligent reflection surface is applied to a wireless communication system, the wireless communication system comprises at least one base station, at least one intelligent reflection surface adopting example grouping and at least one user, the multi-standard signal modulation method comprises the following steps:
s1, grouping element units of the intelligent reflection surface, and enabling the L of the intelligent reflection surface0The element units are divided into L groups, wherein each group of unit reflection channels has strong correlation;
s2, splitting the bit information modulated by the intelligent reflection surface into two parts, namely B1 and B2, wherein the bit information in B1 represents the phase modulation method adopted by each grouping element, and the bit information in B2 is subjected to information modulation according to the modulation method represented by the bit information in B1;
s3, determining the reflection phase of each grouping element of the intelligent reflection surface according to the adopted phase modulation method by adopting the M-system phase modulation method and the M-system phase modulation method after the constellation diagram of each grouping element is rotated;
the bit information in S4 and B1 indicates that the phase modulation method adopted by each grouping element has two alternative representation modes, in the first time slot, one bit information in B1 indicates the representation mode of the modulation method, after the receiving end receives the information modulated by the intelligent reflection surface, in the second time slot, the transmitting end transmits the same information, and adopts the other bit information in B1 to indicate the representation mode of the modulation method, so that the bit information in B2 is modulated according to the modulation method indicated by the bit information in B1;
and S5, demodulating the modulation information of the intelligent reflection surface at the receiving end.
Further, in a group of grouping elements of the intelligent reflection surface, B1 contains a bit of information, which is represented as 0 or 1 in binary form, and the binary bit information is used to represent the phase modulation method during the modulation process, two schemes can be selected, namely, 0 represents the scheme of M-ary phase modulation method after rotating the constellation diagram and 1 represents the scheme of M-ary phase modulation method after rotating the constellation diagram and 0 represents the scheme of M-ary phase modulation method after rotating the constellation diagram, and in the first time slot, the representation of the phase modulation method of one scheme is selected and determined, and in the second time slot, the representation of the phase modulation method of the other scheme is used.
Further, in a group of grouping elements of the intelligent reflecting surface, the bit information in B2 is modulated according to the modulation mode determined by the bit information in B1, and the symbol of the bit information in B2 modulated according to the M-ary phase modulation method is marked as XmThe symbol of the bit information in B2 modulated according to M-ary phase modulation method after constellation rotation is XXmWherein M represents an index of a symbol modulated by the M-ary phase modulation method and the constellation diagram rotated M-ary phase modulation method, and a value range of M is 1, 2.
Further, the process of step S3 is as follows:
assuming that the channel state information of the base station and the intelligent reflection surface to the wireless communication system is known, analyzing and determining the optimal reflection phase of each group of elements of the intelligent reflection surface to the wireless communication system, and calculating the reflection phase by taking the maximum instantaneous signal-to-noise ratio of the receiving antenna as an optimization target, wherein the calculation process is as follows:
the instantaneous snr received by the receiving antenna is expressed as:
Figure BDA0002734797660000031
according to the expression of the instantaneous signal-to-noise ratio received by the receiving end antenna, when the receiving antenna obtains the maximum instantaneous receiving signal-to-noise ratio as a target, the optimal reflection phase is selected as follows:
Figure BDA0002734797660000032
the reflection phase of the element grouped by the M-ary phase modulation method is expressed as:
Figure BDA0002734797660000041
the reflection phase of the grouping element of the M-system phase modulation method after constellation diagram rotation is expressed as:
Figure BDA0002734797660000042
wherein L denotes an index of a component element of the smart reflective surface L and L ═ 1,2l、
Figure BDA0002734797660000043
Respectively representing the amplitude coefficient and the phase coefficient of the channel from the I group of packet elements of the intelligent reflecting surface to the receiving end, e representing a natural constant,
Figure BDA0002734797660000044
θlepsilon [0,2 pi) ] represents the l-th componentThe reflection phase of the element, the reflection amplitude of each element of the smart reflective surface unit is set to a maximum value of 1, XmIs a symbol modulated by an M-system phase modulation method, and is less than XmDenotes symbol XmPhase of (2), XXmIs a symbol modulated by an M-system phase modulation method after constellation diagram rotation, and is less than XXmRepresenting symbol XXmM represents the symbol index modulated by the M-ary phase modulation method and the constellation diagram rotated M-ary phase modulation method, and the value range of M is 1,2SIs the energy of the unmodulated signal, N0Is the noise power.
Further, the process of step S4 is as follows:
after the transmission signal is modulated by the intelligent reflection surface, the signal received by the first time slot user is expressed as:
Figure BDA0002734797660000045
wherein, it is assumed that the bit information in the first slot determination B1 represents a representation mode of the phase modulation method, the P group elements adopt M-system phase modulation method, the L-P group elements adopt M-system phase modulation method after constellation diagram rotation,
Figure BDA0002734797660000046
representing the channel of the l-th group of packet elements of the intelligent reflecting surface to the receiving end,
Figure BDA0002734797660000047
is additive white Gaussian noise, and obeys a mean value of 0 and a variance of N0Normal distribution of (2);
the same information is transmitted, the second time slot adopts another representation mode that the bit information in the first time slot B1 represents the phase modulation method, after the transmitted signal is modulated by the intelligent reflection surface, the signal received by the user in the second time slot is represented as:
Figure BDA0002734797660000051
the number P of group elements adopts an M-system phase modulation method after constellation diagram rotation, and the number L-P of group elements adopts the M-system phase modulation method.
Further, the process of step S5 is as follows:
signals received by two time slots of a receiving end are respectively expressed in a vector form:
Y＝[y1,y2,...,yL]，Y＝[y 1,y 2,...,y L]；
wherein, ylThe signal modulated by the first group of intelligent reflection surface multi-standard signal modulation method received at the receiving end of the first time slot is represented,y lthe signal which is received at a receiving end of a second time slot and modulated by a multi-standard signal modulation method of a first group of intelligent reflection surfaces is represented;
demodulating the modulation information of the intelligent reflection surface at a receiving end by adopting a maximum likelihood detection algorithm, and assuming that the receiving end knows the channel state information hlFor the signal received in the first slot:
Figure BDA0002734797660000052
signal received for the second slot:
Figure BDA0002734797660000053
wherein the content of the first and second substances,
Figure BDA0002734797660000054
represents the difference between the received signal at the receiving end of the first time slot and the theoretical received signal,
Figure BDA0002734797660000055
representing the difference between the received signal at the receiving end of the second time slot and the theoretical received signal;
during demodulation, if
Figure BDA0002734797660000056
At Xm(XXm) While obtaining the minimum value
Figure BDA0002734797660000057
In XXm(Xm) Obtaining the minimum value, determining the bit information in B1 according to the phase modulation representation method adopted by the bit information in B1, and comparing
Figure BDA0002734797660000058
And
Figure BDA0002734797660000059
selecting a value with a smaller value, and demodulating the bit information in B2 according to a constellation mapping mode; if it is
Figure BDA00027347976600000510
At Xm(XXm) While obtaining the minimum value
Figure BDA00027347976600000511
At Xm(XXm) Taking the minimum value, and comparing
Figure BDA00027347976600000512
And
Figure BDA00027347976600000513
selecting a value with a smaller value, determining bit information in B1 according to a phase modulation representation method adopted by the bit information in B1, and demodulating the bit information in B2 according to a constellation mapping mode.
Compared with the prior art, the invention has the following advantages and effects:
1) the invention can simplify the design of the sending end and the hardware related to modulation and save the cost by carrying out information modulation through the intelligent reflection surface.
2) The invention increases the bit information number modulated by each group of elements of the intelligent reflecting surface by grouping the element units of the intelligent reflecting surface and adopting a multi-system phase modulation scheme.
3) Compared with the traditional phase modulation scheme, the multi-system phase modulation scheme provided by the invention can obtain higher spectral efficiency through different groups of the intelligent reflection surface.
Drawings
Fig. 1 is a model diagram of a downlink intelligent reflective surface assisted single-input single-output wireless communication system for multi-mode phase modulation according to an embodiment of the present invention;
FIG. 2 is a simulation diagram comparing bit error rate performance of a multi-system phase modulation scheme based on an intelligent reflection surface with that of a conventional phase modulation scheme in an embodiment of the present invention;
fig. 3 is a flowchart of a multi-system signal modulation method based on an intelligent reflection surface in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, fig. 1 is a model diagram of a downlink intelligent reflective surface assisted single-input single-output wireless communication system for performing multi-mode phase modulation according to an embodiment of the present invention. As shown in fig. 1, the application scenario of the present embodiment includes a base station, an intelligent reflective surface using example grouping, and a user.
In this embodiment, the intelligent reflection surface is disposed near the base station and is approximately regarded as a part of the base station, the influence of a channel from the base station to the intelligent reflection surface on information transmission is negligible, and the intelligent reflection surface can sense information such as ambient environment data through its own sensor and perform information interaction and phase control with the base station through a control link. The base station, the intelligent reflective surface, and the user are known to the channel state information. The channel model is a quasi-static block fading channel, and the channel coefficients are constant and independently distributed in different fading blocks. It is assumed that the channel between the base station and the user is blocked. The process steps for carrying out the process of the invention are described in detail below with reference to FIG. 1.
S1, grouping element units of the intelligent reflection surface, and enabling the L of the intelligent reflection surface0The element units are divided into L groups, wherein each group of unit reflection channels has strong correlation.
And S2, converting the information sensed by the intelligent reflection surface into a binary form and splitting the converted binary bit information into two parts, namely B1 and B2, wherein the bit information in the B1 represents the phase modulation method adopted by each grouping element, and the bit information in the B2 is subjected to information modulation according to the modulation method represented by the bit information in the first part.
S201, in this embodiment, one bit of information in B1 represents a quaternary phase modulation method and a quaternary phase modulation method in which a constellation diagram rotates by 45 degrees, and the first representation manner is: 0 represents a quaternary phase modulation method and 1 represents a quaternary phase modulation method with constellation diagram rotated by 45 degrees; the second expression mode is as follows: 1 represents a quaternary phase digital modulation method and 0 represents a quaternary phase modulation method in which a constellation diagram is rotated by 45 degrees. 0. 1 is a representation of a binary symbol.
In this embodiment, it is assumed that the known intelligent reflective surface packet elements at the receiving end are represented by a phase modulation method.
The bit information in S202 and B2 is modulated according to the modulation method determined by the bit information in B1.
To illustrate the inventive principles in detail, the modulation method employed by the grouping elements shown in fig. 1 is taken as an example. In a group of intelligent reflective surface grouping elements, B2 contains two bits of information, which can be represented by four constellation points in the example diagram. Note that the symbol of the bit information in B2 modulated according to the quaternary phase modulation method is X1,X2,X3,X4Note that in B2The symbol of the bit information modulated by the quaternary phase modulation method rotating 45 degrees according to the constellation diagram is XX1,XX2,XX3,XX4。
After the bit information in B2 is modulated according to the quaternary phase modulation method, the corresponding relationship between the information bits and the modulation symbols is:
Figure BDA0002734797660000081
after the bit information in B2 is modulated according to the quaternary phase modulation method with constellation diagram rotated by 45 degrees, the corresponding relationship between the information bits and the modulation symbols is:
Figure BDA0002734797660000082
and S3, determining the reflection phase of the grouped elements of the intelligent reflection surface.
S301, analyzing and determining the optimal reflection phase of each group of elements of the intelligent reflection surface for the wireless communication system, and calculating the reflection phase by taking the instantaneous signal-to-noise ratio of the maximized receiving antenna as an optimization target, wherein the calculation process is as follows:
the instantaneous snr received by the receiving antenna is expressed as:
Figure BDA0002734797660000083
wherein L denotes an index of a component element of the smart reflective surface L and L ═ 1,2l、
Figure BDA0002734797660000091
Respectively representing the amplitude coefficient and the phase coefficient of the channel from the I group of packet elements of the intelligent reflecting surface to the receiving end, e representing a natural constant,
Figure BDA0002734797660000092
θle [0,2 π) represents the reflection phase of the l-th component element, in the present invention, eachThe reflection amplitude of the element of the smart reflective surface is set to a maximum value of 1, ESIs the energy of the unmodulated signal, N0Is the noise power.
According to the expression of the instantaneous signal-to-noise ratio received by the receiving end antenna, when the receiving antenna obtains the maximum instantaneous receiving signal-to-noise ratio as a target, the optimal reflection phase is selected as follows:
Figure BDA0002734797660000093
s302, the reflection phase of the grouping element adopting the quaternary phase modulation method is expressed as:
Figure BDA0002734797660000094
the reflection phase of the grouping element of the M-system phase modulation method after constellation diagram rotation is expressed as:
Figure BDA0002734797660000095
m represents an index of a symbol modulated by the M-ary phase modulation method and the M-ary phase modulation method after constellation rotation, and the value of M in this example is 1,2, 3, 4.
S4, after the transmission signal is modulated by the intelligent reflective surface, the signal received by the first slot user is represented as:
Figure BDA0002734797660000096
wherein, the bit information in the B1 of the first time slot adopts the first expression in step S201 to express the phase modulation method adopted by each grouping element, assuming that the number P of grouping elements adopts the quaternary phase modulation method, the number L-P of grouping elements adopts the quaternary phase modulation method after the constellation diagram rotates 45 degrees,
Figure BDA0002734797660000097
representing the channel of the l-th group of packet elements of the intelligent reflecting surface to the receiving end, gl、
Figure BDA0002734797660000098
Respectively representing the amplitude coefficient and the phase coefficient of the channel from the I group of packet elements of the intelligent reflecting surface to the receiving end, e representing a natural constant,
Figure BDA0002734797660000099
Figure BDA00027347976600000910
is additive white Gaussian noise, and obeys a mean value of 0 and a variance of N0Normal distribution of (2);
the same information is transmitted, the bit information in B1 of the second time slot adopts the phase modulation method adopted by the representation mode two in step S201 to represent each grouping element, after the transmission signal is modulated by the intelligent reflection surface, the signal received by the user of the second time slot is represented as:
Figure BDA0002734797660000101
the number L-P group elements adopt a quaternary phase modulation method, and the number P group elements adopt a quaternary phase modulation method after a constellation diagram rotates by 45 degrees.
And S5, demodulating the signal received by the receiving end.
S501, respectively representing signals received by two time slots of the receiving end as vector form:
Y＝[y1,y2,...,yL]，Y＝[y 1,y 2,...,y L]；
wherein, ylThe signal after the multi-system phase modulation of the first group of intelligent reflecting surfaces is received at the receiving end of the first time slot,y lthe signal after multi-system phase modulation of the first group of intelligent reflecting surfaces received at the receiving end of the second time slot is represented;
s502, adopting at the receiving endDemodulating intelligent reflection surface modulation information by using maximum likelihood detection algorithm, and assuming that the receiving end knows channel state information hlFor the signal received in the first slot:
Figure BDA0002734797660000102
signal received for the second slot:
Figure BDA0002734797660000103
wherein the content of the first and second substances,
Figure BDA0002734797660000104
represents the difference between the received signal at the receiving end of the first time slot and the theoretical received signal,
Figure BDA0002734797660000105
representing the difference between the received signal at the receiving end of the second time slot and the theoretical received signal;
during demodulation, if
Figure BDA0002734797660000106
At Xm(XXm) Taking the minimum value at the same time
Figure BDA0002734797660000107
In XXm(Xm) Obtaining the minimum value, determining the bit information in B1 according to the phase modulation representation method adopted by the bit information in B1, and comparing
Figure BDA0002734797660000111
And
Figure BDA0002734797660000112
selecting a value with a smaller value, and demodulating the bit information in B2 according to a constellation mapping mode; if it is
Figure BDA0002734797660000113
At Xm(XXm) Taking the minimum value at the same time
Figure BDA0002734797660000114
At Xm(XXm) Taking the minimum value, and comparing
Figure BDA0002734797660000115
And
Figure BDA0002734797660000116
selecting a value with a smaller value, determining bit information in B1 according to a phase modulation representation method adopted by the bit information in B1, and demodulating the bit information in B2 according to a constellation mapping mode.
In order to illustrate the technical progress of the method, the error rate performance of the multi-standard signal modulation method provided by the invention and the quaternary phase keying modulation method under the Gaussian white noise channel are compared on an MATLAB platform under the condition that the signal-to-noise ratio is different. In the specific parameter setting, the number of the unit elements of the intelligent reflection surface is 64 and 128, respectively, and the unit elements of the intelligent reflection surface are divided into 2, 4 and 8 groups, specifically, fig. 2 is a simulation diagram comparing the bit error rate performance of the multi-system phase modulation scheme based on the intelligent reflection surface with the bit error rate performance of the conventional phase modulation scheme in the embodiment of the present invention.
Compared with the traditional quaternary phase keying modulation method, the method has the following technical progress.
1) The spectrum efficiency or the bit error rate performance is improved. As shown in fig. 2, the multi-standard signal modulation method of the intelligent reflection surface can obtain a lower error rate and improve the accuracy of information transmission compared with the quaternary phase keying modulation method;
2) the element units of the intelligent reflection surface are grouped and a multi-system phase modulation scheme is adopted, so that the bit information number modulated by each group of elements of the intelligent reflection surface is increased.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (4)

1. A multi-standard signal modulation method based on an intelligent reflection surface is applied to a wireless communication system, the wireless communication system comprises at least one base station, at least one intelligent reflection surface adopting example grouping and at least one user, and the multi-standard signal modulation method is characterized by comprising the following steps:
s1, grouping element units of the intelligent reflection surface, and enabling the L of the intelligent reflection surface0The element units are divided into L groups, wherein each group of unit reflection channels has strong correlation;
s2, splitting the bit information modulated by the intelligent reflection surface into two parts, namely B1 and B2, wherein the bit information in B1 represents the phase modulation method adopted by each grouping element, and the bit information in B2 is subjected to information modulation according to the modulation method represented by the bit information in B1;
s3, determining the reflection phase of each grouping element of the intelligent reflection surface according to the adopted phase modulation method by adopting the M-system phase modulation method and the M-system phase modulation method after the constellation diagram of each grouping element is rotated;
in a group of grouping elements of the intelligent reflecting surface, the bit information in B2 is subjected to information modulation according to a modulation mode determined by the bit information in B1, and the symbol of the bit information in B2 after being modulated according to an M-ary phase modulation method is marked as XmThe symbol of the bit information in B2 modulated according to M-ary phase modulation method after constellation rotation is XXmWherein M represents an index of a symbol modulated by the M-system phase modulation method and the M-system phase modulation method after constellation rotation, and the value range of M is 1, 2.
The process of step S3 is as follows:
assuming that the channel state information of the base station and the intelligent reflection surface to the wireless communication system is known, analyzing and determining the optimal reflection phase of each group of elements of the intelligent reflection surface to the wireless communication system, and calculating the reflection phase by taking the maximum instantaneous signal-to-noise ratio of the receiving antenna as an optimization target, wherein the calculation process is as follows:
the instantaneous snr received by the receiving antenna is expressed as:
Figure FDA0003197515650000021
according to the expression of the instantaneous signal-to-noise ratio received by the receiving end antenna, when the receiving antenna obtains the maximum instantaneous receiving signal-to-noise ratio as a target, the optimal reflection phase is selected as follows:
Figure FDA0003197515650000023
the reflection phase of the element grouped by the M-ary phase modulation method is expressed as:
Figure FDA0003197515650000024
the reflection phase of the grouping element of the M-system phase modulation method after constellation diagram rotation is expressed as:
Figure FDA0003197515650000025
wherein L denotes an index of a component element of the smart reflective surface L and L ═ 1,2l、
Figure FDA0003197515650000026
Respectively representing the amplitude coefficient and the phase coefficient of the channel from the I group of packet elements of the intelligent reflecting surface to the receiving end, e representing a natural constant,
Figure FDA0003197515650000022
θle [0,2 π) represents the reflection phase of the l-th component element, each smart reflective surfaceThe reflection amplitude of the element is set to a maximum value of 1, XmIs a symbol modulated by an M-system phase modulation method, and is less than XmDenotes symbol XmPhase of (2), XXmIs a symbol modulated by an M-system phase modulation method after constellation diagram rotation, and is less than XXmRepresenting symbol XXmM represents the symbol index modulated by the M-ary phase modulation method and the constellation diagram rotated M-ary phase modulation method, and the value range of M is 1,2SIs the energy of the unmodulated signal, N0Is the noise power;
the bit information in S4 and B1 indicates that the phase modulation method adopted by each grouping element has two alternative representation modes, in the first time slot, one bit information in B1 indicates the representation mode of the modulation method, after the receiving end receives the information modulated by the intelligent reflection surface, in the second time slot, the transmitting end transmits the same information, and adopts the other bit information in B1 to indicate the representation mode of the modulation method, so that the bit information in B2 is modulated according to the modulation method indicated by the bit information in B1;
and S5, demodulating the modulation information of the intelligent reflection surface at the receiving end.
2. The multi-standard signal modulation method according to claim 1, wherein B1 contains a bit of information in a set of grouping elements of the intelligent reflective surface, the information is represented as 0 or 1 in binary form, and the binary bit information is used to represent the phase modulation method during the modulation process, and two schemes can be selected, i.e. 0 represents the scheme of M-system phase modulation method after constellation rotation is represented by 1 or 1 represents the scheme of M-system phase modulation method after constellation rotation is represented by 0, and the representation of the phase modulation method of one scheme is selected and determined in the first time slot, and the representation of the phase modulation method of the other scheme is used in the second time slot.
3. The method for modulating multi-standard signals based on intelligent reflective surfaces as claimed in claim 1, wherein the process of step S4 is as follows:
after the transmission signal is modulated by the intelligent reflection surface, the signal received by the first time slot user is expressed as:
Figure FDA0003197515650000031
wherein, it is assumed that the bit information in the first slot determination B1 represents a representation mode of the phase modulation method, the P group elements adopt M-system phase modulation method, the L-P group elements adopt M-system phase modulation method after constellation diagram rotation,
Figure FDA0003197515650000034
representing the channel of the l-th group of packet elements of the intelligent reflecting surface to the receiving end,
Figure FDA0003197515650000033
is additive white Gaussian noise, and obeys a mean value of 0 and a variance of N0Normal distribution of (2);
the same information is transmitted, the second time slot adopts another representation mode that the bit information in the first time slot B1 represents the phase modulation method, after the transmitted signal is modulated by the intelligent reflection surface, the signal received by the user in the second time slot is represented as:
Figure FDA0003197515650000032
the number P of group elements adopts an M-system phase modulation method after constellation diagram rotation, and the number L-P of group elements adopts the M-system phase modulation method.
4. The method for modulating multi-standard signals based on intelligent reflective surfaces as claimed in claim 3, wherein the process of step S5 is as follows:
signals received by two time slots of a receiving end are respectively expressed in a vector form:
Y＝[y1，y2，…，yL]，Y＝[y 1，y 2，…，y L]；
wherein, ylThe signal modulated by the first group of intelligent reflection surface multi-standard signal modulation method received at the receiving end of the first time slot is represented,y ithe signal which is received at a receiving end of a second time slot and modulated by a multi-standard signal modulation method of a first group of intelligent reflection surfaces is represented;
demodulating the modulation information of the intelligent reflection surface at a receiving end by adopting a maximum likelihood detection algorithm, and assuming that the receiving end knows the channel state information hlFor the signal received in the first slot:
Figure FDA0003197515650000041
signal received for the second slot:
Figure FDA0003197515650000042
wherein the content of the first and second substances,
Figure FDA0003197515650000043
represents the difference between the received signal at the receiving end of the first time slot and the theoretical received signal,
Figure FDA0003197515650000044
representing the difference between the received signal at the receiving end of the second time slot and the theoretical received signal;
during demodulation, if
Figure FDA00031975156500000412
At Xm(XXm) While obtaining the minimum value
Figure FDA0003197515650000045
In XXm(Xm) Obtaining the minimum value, determining the bit information in B1 according to the phase modulation representation method adopted by the bit information in B1, and comparing
Figure FDA0003197515650000046
And
Figure FDA0003197515650000047
selecting a value with a smaller value, and demodulating the bit information in B2 according to a constellation mapping mode; if it is
Figure FDA0003197515650000048
At Xm(XXm) While obtaining the minimum value
Figure FDA0003197515650000049
At Xm(XXm) Taking the minimum value, and comparing
Figure FDA00031975156500000410
And
Figure FDA00031975156500000411
selecting a value with a smaller value, determining bit information in B1 according to a phase modulation representation method adopted by the bit information in B1, and demodulating the bit information in B2 according to a constellation mapping mode.
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