Design method of dynamically linked communication system with reconfigurable holographic surface

Abstract

The invention discloses a design method of a dynamically linked communication system with a reconfigurable holographic surface, and belongs to the technical field of wireless communication. The implementation method comprises the steps that 1, a single-source transmitter and a receiver are constructed, the transmitter is provided with a precoder, a switch selection link and a reconfigurable holographic surface, and the receiver is provided with a combiner, a switch selection link and a reconfigurable holographic surface; 2, inputting the digital beam forming signal to a holographic antenna through a feed source selected by a switch selection link to form a transmitting signal; 3, acquiring a channel matrix, selecting a feed source position by utilizing interaction entropy iteration, realizing digital beam forming through power distribution, realizing RHS unit excitation by utilizing element-by-element iteration, and finishing beam forming of the whole signal; 4, acquiring a received signal by using a receiver through the RHS combiner and the digital signal combiner; compared with the prior art, the communication transmission rate of the reconfigurable holographic surface is improved in a random channel change scene.

Description

Technical Field

[0001] The present invention relates to a design method for a communication system of a dynamically linked reconfigurable holographic surface, belongs to the technical field of wireless communications, and is applied to hybrid beam forming of holographic antennas. Background Art

[0002] Reconfigurable holographic surface (RHS) technology has been a cutting-edge research direction at the intersection of communications and electromagnetics in recent years. Its core is to achieve high-degree-of-freedom, intelligent wireless signal coverage and beamforming by dynamically controlling the electromagnetic properties of metamaterial surfaces. Based on the physical properties of metasurfaces, this technology integrates a large number of programmable subwavelength microstructure units on a two-dimensional plane and uses holographic principles to "encode" the preset electromagnetic field distribution into the surface structure parameters. Unlike traditional phased array antennas, RHS dynamically adjusts the electromagnetic response (amplitude) of each unit, reconstructing the radiation pattern of electromagnetic waves without a complex feeding network. It can generate holographic beams with specific directions, polarizations, and waveforms in real time. Its outstanding advantages lie in its lightweight hardware structure, low energy consumption, and software-defined support, enabling it to adapt to environmental changes. In 6G communications, it can significantly improve spectral efficiency and expand coverage, and it also shows potential in areas such as holographic imaging and radar stealth.

[0003] Currently, existing research efforts are largely focused on achieving control of the RHS antenna radiation direction through hybrid beamforming, thereby improving communication performance. Among the many existing solutions, the mainstream approach is to digitally beamform the signal through a precoder, directly connecting it to the RHS antenna through a radio frequency link for signal transmission. In this design, the feed position on the RHS antenna is fixed and fully connected to the communication system. This solution achieves an overall beamforming design by sequentially designing the precoder and RHS unit excitation, thereby improving the system's transmission performance. However, in reality, this RHS system with a fixed feed only designs the precoder and unit excitation, ignoring the impact of the feed position on the overall beamforming. In the face of random channel changes, the fixed feed position will affect the signal beamforming design, and the information transmission rate at the transmitter and receiver will be affected by the random channel changes, resulting in a loss of communication system transmission performance.

[0004] Therefore, how to improve the communication transmission rate of reconfigurable holographic surfaces under random channel change scenarios has become an urgent problem to be solved. Summary of the Invention

[0005] In order to solve the problem of improving the communication transmission rate of reconfigurable holographic surfaces in random channel change scenarios, the purpose of the present invention is to provide a communication system design method for a dynamically linked reconfigurable holographic surface, which adopts the method of connecting a selection switch link to the RHS feed source, selecting the feed source in a cross-entropy minimization manner, updating the RHS unit amplitude by an element-by-element method, and performing digital beamforming by a power allocation method to jointly process the beamforming in an alternating optimization manner, thereby suppressing the adverse effects of random channel changes and improving the RHS communication transmission rate.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention discloses a method for designing a communication system of a dynamically linked reconfigurable holographic surface, which is applied in holographic communication and includes the following steps:

[0008] Step 1: Construct a single-source transmitter and receiver for holographic communication. The transmitter is equipped with a precoder for digital beamforming, a switch selection link for selecting the incoming feed source, and a reconfigurable holographic surface for RHS beamforming. The receiver is equipped with a combiner for digital signal combination, a switch selection link for selecting the outgoing feed source, and a reconfigurable holographic surface for RHS beam reception.

[0009] Step 2: The digital beamforming signal pre-coded by the transmitter is input to the feed source selected by the switch selection link to form the transmission signal;

[0010] Step 2.1: Utilize the transmitter’s precoder For the original signal stream N S Precoding is performed to form a digital beamforming signal as shown in formula (1);

[0011] x V =Vx (1)

[0012] Among them, the transmitted signal is a digital beamforming signal;

[0013] Step 2.2: The digital beamforming signal is input to the holographic antenna through the feed source selected by the switch selection link to form a transmission signal;

[0014] Step 2.2.1: Use the switch selection link to select the access feed source;

[0015] Step 2.2.2: Connect the digital beamforming signal to the selected feed source to stimulate the RHS unit to form the RHS beamforming signal x as shown in equation (2): F ;

[0016]

[0017] in, is the RHS beamforming matrix, λ represents the wavelength of the electromagnetic wave generated by the feed source, f k and s n Represents the direction vector of the selected feed and RHS element, where n=1,2,3.....N and k=1,2,3.....N RF ;

[0018] Step 2.2.3: Excite each unit of the RHS to form the transmission signal s as shown in formula (3);

[0019] s=Ax F (3)

[0020] Among them, A[n,n]=A n is the excitation matrix, A n ∈[0,1] is the excitation amplitude of each unit,

[0021] Step 3: Obtain the channel matrix and use interactive entropy iteration to select the feed position. Implement digital beamforming through power allocation and use element-by-element iteration to excite the RHS unit to complete the beamforming of the overall signal.

[0022] Step 3.1: Obtain the channel matrix H using equation (4);

[0023]

[0024] Among them, r m Represents the direction vector of the receiver feed; m, n represent the index of the receiver and transmitter RHS units;

[0025] Step 3.2: Use interactive entropy iteration to select the feed position, implement digital beamforming through power allocation, and use element-by-element iteration to excite the RHS unit to complete the beamforming of the entire signal.

[0026] Step 3.2.1: Set the iteration threshold, initialize the amplitude matrix A and the digital beamforming matrix V, and satisfy A[n,n]=1, V[m,n]=1, And the initial probability matrix is ​​obtained using the method shown in formula (5);

[0027]

[0028] in, represents the probability of the kth information flow selecting the lth feed source in the initial state; L represents the number of feed sources selected by each information flow;

[0029] Step 3.2.2: Randomly generate C groups of feed positions according to the probability matrix Generate a set of beamforming matrices in The dimension size is N RF ×L matrix; In the k-th row, only the l-th element has a value of 1, which means that the k-th information flow selects the l-th feed source; is the RHS beamforming matrix generated according to the selected feed position;

[0030] Step 3.2.3: Use formula (6) to calculate a set of sum rates

[0031]

[0032] Step 3.2.4: Sort the sum rates in descending order using the method shown in formula (7);

[0033]

[0034] Step 3.2.5: Select the top C e and rate and record the feed position

[0035] Step 3.2.6: Use formula (8) to calculate the front C e The sum of the rates is weighted;

[0036]

[0037] Step 3.2.7: Update the probability matrix using formula (9);

[0038]

[0039] Step 3.2.8: Execute steps 3.2.2 to 3.2.7 in a loop iteration manner until only one element in each row of the probability matrix is ​​1, and obtain the feed selection matrix corresponding to the probability matrix;

[0040] Step 3.2.9: Calculate the k-th RHS unit excitation metric matrix C according to formula (10) k and G k :

[0041]

[0042] in, It is Matrix AF c The submatrix after removing the elements in the kth column of V, R = H H H;

[0043] Step 3.2.10: Calculate the excitation coefficient matrix P of the kth RHS unit according to equation (11);

[0044]

[0045] Among them, v (k) F c The k-th column element of V;

[0046] Step 3.2.11: Use the elements of the RHS unit excitation coefficient matrix P to obtain the excitation amplitude A of the kth unit of the RHS unit k ; Get a set of A in a loop iteration k ;

[0047] Step 3.2.12: Obtain the equivalent channel matrix H according to equation (12) reff ;

[0048]

[0049] Step 3.2.13: Obtain singular values ​​through singular value decomposition and the left singular vector matrix U reff ; Let the singular value be represented by H reff The sth singular value of ;

[0050] Step 3.2.14: Calculate the allocated power allocation matrix according to equation (13);

[0051]

[0052] Step 3.2.15: Calculate the digital beamforming V according to equation (14);

[0053]

[0054] Step 3.2.16: Calculate the sum rate R using equation (15);

[0055]

[0056] Step 3.2.17: Execute steps 3.2.2 to 3.2.16 in an iterative loop until the difference between the sum rate calculated in the previous step and the sum rate obtained in the previous step is less than the iteration threshold;

[0057] Step 4: Use the receiver to obtain the received signal through the RHS combiner and the digital signal combiner;

[0058] Step 4.1: The transmitted signal s passes through the channel matrix H to obtain the receiver signal r as shown in equation (16);

[0059] r=Hs (16)

[0060] Step 4.2: The holographic antenna receiving signal is combined with the feed source selected by the switch selection link to form the receiving signal y;

[0061] Step 4.2.1: Excite the RHS unit to generate the received signal y as shown in Equation (17) F ;

[0062] y F =Br (17)

[0063] Where B[n,n]=A n is the excitation matrix, B n ∈[0,1] is the excitation amplitude of each unit,

[0064] Step 4.2.2: Use the switch selection link to select the outgoing feed source;

[0065] Step 4.2.3: Connect the signal after the RHS unit excitation to the selected feed source to form the RHS combined signal y as shown in formula (18) v ;

[0066]

[0067] in, is the RHS beamforming matrix, λ represents the wavelength of the electromagnetic wave generated by the feed source, f k and s n Represents the direction vector of the selected feed and RHS element, where n=1,2,3.....N and k=1,2,3.....N RF ;

[0068] Step 4.2.4: Utilize the receiver's combiner For the RHS combined signal y v Combining to form a received signal as shown in formula (19);

[0069] y=Wy v (19)

[0070] Among them, the received signal

[0071] Step 4.3: Obtain the receiver beamforming in the same manner as in Step 3.

[0072] Furthermore, the present invention discloses a communication system design device for a dynamically linked reconfigurable holographic surface, which is used to implement the above method. The present invention discloses a communication system design device for a dynamically linked reconfigurable holographic surface, comprising a precoder module, a transmitter feed selection module, a feed selection module, a transmitter RHS antenna, a receiver RHS antenna, a feed selection module, and a combiner module.

[0073] The precoder module is used to process the original information stream and output a digital beamforming signal, which will serve as the input of the transmitter feed selection module;

[0074] The transmitter feed selection module is used to process the digital beamforming signal, select its input link, and output the digital beamforming signal; which will serve as the input of the transmitter RHS antenna;

[0075] The transmitter RHS antenna is used to process the digital beamforming signal and output an overall beamforming signal;

[0076] The receiver RHS antenna is used to process the signal received by the holographic antenna and output the RHS combined signal, which will serve as the input of the receiver feed selection module;

[0077] The receiver feed selection module is used to process the RHS combined signal, select its input link, and output the RHS combined signal; which will serve as the input of the combiner module;

[0078] The combiner module is used to process the RHS combined signal and output a received signal;

[0079] Compared with the existing technology, it has the following beneficial effects:

[0080] 1. In the present invention, a plurality of selectable feed sources are connected to a switch selection link on a dynamically linked reconfigurable holographic surface. Each information path selects a suitable feed source from a group of feed sources through the switch selection link.

[0081] 2. The present invention realizes the design of the RHS communication system with dynamic link of feed source selection, precoding design and RHS unit amplitude, realizes the maximization of sum rate and improves the information transmission rate of the communication system.

[0082] 3. This paper proposes a dynamically linked RHS communication system design that dynamically modulates the feed position on the RHS antenna based on different environments. The proposed hybrid beamforming design method, through the coupling and alternating iteration of three sub-algorithms, achieves a joint design of feed position, precoding, and RHS element amplitude, effectively improving system performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 It is a schematic diagram of the RHS process of the present invention;

[0084] Figure 2 Schematic diagram of the RHS system architecture of the dynamic link of the present invention;

[0085] Figure 3 Schematic diagram of the flow of the method for selecting a feed source and determining a digital beamforming matrix and an amplitude matrix according to the present invention;

[0086] Figure 4 It is a comparison diagram of the simulation experiment of the present invention. DETAILED DESCRIPTION

[0087] In order to better illustrate the purpose and advantages of the present invention, the following is a further description of the invention in conjunction with the accompanying drawings and examples. It should be noted that the implementation of the present invention is not limited to the following embodiments, and any form of modification or change made to the present invention will fall within the scope of protection of the present invention.

[0088] Example

[0089] like Figure 1 As shown, the design method of a communication system of a dynamically linked reconfigurable holographic surface in this embodiment has the following specific implementation steps:

[0090] Step 1: Construct a single-source transmitter and receiver for holographic communication. The transmitter is equipped with a precoder for digital beamforming, a switch selection link for selecting the incoming feed source, and a reconfigurable holographic surface for RHS beamforming. The receiver is equipped with a combiner for digital signal combination, a switch selection link for selecting the outgoing feed source, and a reconfigurable holographic surface for RHS beam reception.

[0091] In the embodiment, the Figure 2 In the architecture shown, the RHS units are arranged equidistantly on the reconfigurable holographic surface with a spacing of 0.005m, totaling N = 16 × 16. The feed is located at the center of a square formed by four adjacent RHS units. The distance between the transmitter and receiver is 5m, and the reconfigurable holographic surfaces are aligned and placed parallel to each other.

[0092] Step 2: The digital beamforming signal pre-coded by the transmitter is input to the feed source selected by the switch selection link to form the transmission signal;

[0093] Step 2.1: Utilize the transmitter’s precoder For the original signal stream N S Precoding is performed to form a digital beamforming signal as shown in formula (1);

[0094] x V =Vx (1)

[0095] Among them, the transmitted signal is a digital beamforming signal;

[0096] In the embodiment, Figure 3 As shown, the original signal stream length N S =8, number of transmission links N RF =15;

[0097] Step 2.2: The digital beamforming signal is input to the holographic antenna through the feed source selected by the switch selection link to form a transmission signal;

[0098] Step 2.2.1: Use the switch selection link to select the access feed source;

[0099] Step 2.2.2: Connect the digital beamforming signal to the selected feed source to stimulate the RHS unit to form the RHS beamforming signal x as shown in equation (2): F ;

[0100]

[0101] in, is the RHS beamforming matrix, λ represents the wavelength of the electromagnetic wave generated by the feed source, f k and s n Represents the direction vector of the selected feed and RHS element, where n=1,2,3.....N and k=1,2,3.....N RF ;

[0102] In the embodiment, the electromagnetic wavelength generated is λ=0.001;

[0103] Step 2.2.3: Excite each unit of the RHS to form the transmission signal s as shown in formula (3);

[0104]

[0105] Among them, A[n,n]=A n is the excitation matrix, A n ∈[0,1] is the excitation amplitude of each unit,

[0106] Step 3: Obtain the channel matrix and use interactive entropy iteration to select the feed position. Implement digital beamforming through power allocation and use element-by-element iteration to excite the RHS unit to complete the beamforming of the overall signal.

[0107] Step 3.1: Obtain the channel matrix H using equation (4);

[0108]

[0109] Among them, r m Represents the direction vector of the receiver feed; m, n represent the index of the receiver and transmitter RHS units;

[0110] Step 3.2: Use interactive entropy iteration to select the feed position, implement digital beamforming through power allocation, and use element-by-element iteration to excite the RHS unit to complete the beamforming of the entire signal.

[0111] Step 3.2.1: Set the iteration threshold, initialize the amplitude matrix A and the digital beamforming matrix V, and satisfy A[n,n]=1, V[m,n]=1, And the initial probability matrix is ​​obtained using the method shown in formula (5);

[0112]

[0113] in, represents the probability of the kth information flow selecting the lth feed source in the initial state; L represents the number of feed sources selected by each information flow;

[0114] In the embodiment, the iteration threshold is 0.001, and the number of optional feed sources is 15;

[0115] Step 3.2.2: Randomly generate C groups of feed positions according to the probability matrix Generate a set of beamforming matrices in The dimension size is N RF ×L matrix; In the k-th row, only the l-th element has a value of 1, which means that the k-th information flow selects the l-th feed source; is the RHS beamforming matrix generated according to the selected feed position;

[0116] In the embodiment, the number of generated groups C=16;

[0117] Step 3.2.3: Use formula (6) to calculate a set of sum rates

[0118]

[0119] Step 3.2.4: Sort the sum rates in descending order using the method shown in formula (7);

[0120]

[0121] Step 3.2.5: Select the top C e and rate and record the feed position

[0122] In the embodiment, the number C is selected e =16;

[0123] Step 3.2.6: Use formula (8) to calculate the front C e The sum of the rates is weighted;

[0124]

[0125] Step 3.2.7: Update the probability matrix using formula (9);

[0126]

[0127] In the embodiment, the incremental update coefficient α=0.1;

[0128] Step 3.2.8: Execute steps 3.2.2 to 3.2.7 in a loop iteration manner until only one element in each row of the probability matrix is ​​1, and obtain the feed selection matrix corresponding to the probability matrix;

[0129] Step 3.2.9: Calculate the k-th RHS unit excitation metric matrix C according to formula (10) k and G k :

[0130]

[0131] in, It is Matrix AF c The submatrix after removing the elements in the kth column of V, R = H H H;

[0132] Step 3.2.10: Calculate the excitation coefficient matrix P of the kth RHS unit according to equation (11);

[0133]

[0134] Among them, v (k) F c The k-th column element of V;

[0135] Step 3.2.11: Use the elements of the RHS unit excitation coefficient matrix P to obtain the excitation amplitude A of the kth unit of the RHS unit k ; Get a set of A in a loop iteration k ;

[0136] In the embodiment, if P[k,k]>0 and A k =0; if P[k,k]>0 and A k=1; if P[k,k]<0 and A k =0; if P[k,k]<0 and A k =1; if P[k,k]<0 and 1>

[0137]

[0138] Step 3.2.12: Obtain the equivalent channel matrix H according to equation (12) reff ;

[0139]

[0140] Step 3.2.13: Obtain singular values ​​through singular value decomposition and the left singular vector matrix U reff ; Let the singular value be represented by H reff The sth singular value of ;

[0141] Step 3.2.14: Calculate the allocated power allocation matrix according to equation (13);

[0142]

[0143] Step 3.2.15: Calculate the digital beamforming V according to equation (14);

[0144]

[0145] Step 3.2.16: Calculate the sum rate R using equation (15);

[0146]

[0147] Step 3.2.17: Execute steps 3.2.2 to 3.2.16 in an iterative loop until the difference between the sum rate calculated in the previous step and the sum rate obtained in the previous step is less than the iteration threshold;

[0148] Step 4: Use the receiver to obtain the received signal through the RHS combiner and the digital signal combiner;

[0149] Step 4.1: The transmitted signal s passes through the channel matrix H to obtain the receiver signal r as shown in equation (16);

[0150]

[0151] Step 4.2: The holographic antenna receiving signal is combined with the feed source selected by the switch selection link to form the receiving signal y;

[0152] Step 4.2.1: Excite the RHS unit to generate the received signal y as shown in Equation (17) F ;

[0153] y F =Br (17)

[0154] Where B[n,n]=A n is the excitation matrix, B n ∈[0,1] is the excitation amplitude of each unit,

[0155] Step 4.2.2: Use the switch selection link to select the outgoing feed source;

[0156] Step 4.2.3: Connect the signal after the RHS unit excitation to the selected feed source to form the RHS combined signal y as shown in formula (18) v ;

[0157]

[0158]

[0159] in, is the RHS beamforming matrix, λ represents the wavelength of the electromagnetic wave generated by the feed source, f k and s n Represents the direction vector of the selected feed and RHS element, where n=1,2,3.....N and k=1,2,3.....N RF ;

[0160] Step 4.2.4: Utilize the receiver's combiner For the RHS combined signal y v Combining to form a received signal as shown in formula (19);

[0161] y=Wy v (19)

[0162] Among them, the received signal

[0163] Step 4.3: Obtain the receiver beamforming in the same manner as in Step 3.

[0164] Furthermore, a communication system design device for a dynamically linked reconfigurable holographic surface according to this embodiment is used to implement the above method. The communication system design device for a dynamically linked reconfigurable holographic surface according to this embodiment includes a precoder module, a transmitter feed selection module, a feed selection module, a transmitter RHS antenna, a receiver RHS antenna, a feed selection module, and a combiner module.

[0165] The precoder module is used to process the original information stream and output a digital beamforming signal, which will serve as the input of the transmitter feed selection module;

[0166] The transmitter feed selection module is used to process the digital beamforming signal, select its input link, and output the digital beamforming signal; which will serve as the input of the transmitter RHS antenna;

[0167] The transmitter RHS antenna is used to process the digital beamforming signal and output an overall beamforming signal;

[0168] The receiver RHS antenna is used to process the signal received by the holographic antenna and output the RHS combined signal, which will serve as the input of the receiver feed selection module;

[0169] The receiver feed selection module is used to process the RHS combined signal, select its input link, and output the RHS combined signal; which will serve as the input of the combiner module;

[0170] The combiner module is used to process the RHS combined signal and output a received signal;

[0171] In order to further illustrate the advantages of the present invention, the following is a description of the present invention in combination with simulation experimental data.

[0172] like Figure 4 As shown in the figure, under different signal-to-noise ratio conditions, the sum and rate performance of the dynamically linked RHS system of the present invention are better than those of the traditional RHS system, and as the signal-to-noise ratio increases, the gap between the two gradually widens, indicating that the dynamically linked RHS system has more advantages in processing signals and improving transmission rates.

[0173] The above specific description further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for designing a communication system for a dynamically linked reconfigurable holographic surface, characterized by: The following steps are included: Step 1: Construct a single-source transmitter and receiver for holographic communication. The transmitter is equipped with a precoder for digital beamforming, a switch selection link for selecting the incoming feed source, and a reconfigurable holographic surface for RHS beamforming. The receiver is equipped with a combiner for digital signal combination, a switch selection link for selecting the outgoing feed source, and a reconfigurable holographic surface for RHS beam reception. Step 2: The digital beamforming signal pre-coded by the transmitter is input to the feed source selected by the switch selection link to form the transmission signal; Step 2.1: Utilize the transmitter’s precoder For the original signal stream N S Precoding is performed to form a digital beamforming signal as shown in formula (1); x V =Vx (1) Wherein, the transmission signal is a digital beamforming signal; Step 2.2: The digital beamforming signal is input to the holographic antenna through the feed source selected by the switch selection link to form a transmission signal; Step 3: Obtain the channel matrix and use interactive entropy iteration to select the feed position. Implement digital beamforming through power allocation and use element-by-element iteration to excite the RHS unit to complete the beamforming of the overall signal. Step 3.1: Obtain the channel matrix H using equation (4); Among them, r m Represents the direction vector of the receiver feed; m, n represent the index of the receiver and transmitter RHS units; Step 3.2: Use interactive entropy iteration to select the feed position, implement digital beamforming through power allocation, and use element-by-element iteration to excite the RHS unit to complete the beamforming of the entire signal. Step 4: Use the receiver to obtain the received signal through the RHS combiner and the digital signal combiner; Step 4.1: The transmitted signal s passes through the channel matrix H to obtain the receiver signal r as shown in equation (16); r = Hs (16) Step 4.2: Combine the holographic antenna receiving signals with the feed source selected by the switch selection link to form the received signal y; Step 4.3: Obtain the receiver beamforming in the same manner as step 3.

2. The method for designing a communication system for a dynamically linked reconfigurable holographic surface according to claim 1, wherein: The implementation method of step 2.2 is: Step 2.2.1: Use the switch selection link to select the access feed source; Step 2.2.2: Connect the digital beamforming signal to the selected feed source to stimulate the RHS unit to form the RHS beamforming signal x as shown in equation (2): F ; x F =F c x V (2) Among them, is the RHS beamforming matrix, λ represents the wavelength of the electromagnetic wave generated by the feed source, f k and s n Represents the direction vector of the selected feed and RHS element, where n=1,2,3.....N and k=1,2,3.....N RF ; Step 2.2.3: Excite each unit of the RHS to form the transmission signal s as shown in formula (3); s=Ax F (3) Among them, A[n,n]=A n is the excitation matrix, A n ∈[0,1] is the excitation amplitude of each unit, 3. The method for designing a communication system for a dynamically linked reconfigurable holographic surface according to claim 1, wherein: The implementation method of step 3.2 is: Step 3.2.1: Set the iteration threshold, initialize the amplitude matrix A and the digital beamforming matrix V, and satisfy A[n,n]=1, V[m,n]=1, And the initial probability matrix is ​​obtained using the method shown in formula (5); in, represents the probability of the kth information flow selecting the lth feed source in the initial state; L represents the number of feed sources selected by each information flow; Step 3.2.2: Randomly generate C groups of feed positions according to the probability matrix Generate a set of beamforming matrices in The dimension size is N RF ×L matrix; In the k-th row, only the l-th element has a value of 1, which means that the k-th information flow selects the l-th feed source; is the RHS beamforming matrix generated according to the selected feed position; Step 3.2.3: Use formula (6) to calculate a set of sum rates Step 3.2.4: Sort the sum rates in descending order using the method shown in formula (7); Step 3.2.5: Select the top C e and rate and record the feed position Step 3.2.6: Use formula (8) to calculate the front C e The sum of the rates is weighted; Step 3.2.7: Update the probability matrix using formula (9); Step 3.2.8: Execute steps 3.2.2 to 3.2.7 in a loop iteration manner until only one element in each row of the probability matrix is ​​1, and obtain the feed selection matrix corresponding to the probability matrix; Step 3.2.9: Calculate the k-th RHS unit excitation metric matrix C according to formula (10) k and G k : in, It is Matrix AF c The submatrix after removing the elements in the kth column of V, R = H H H; Step 3.2.10: Calculate the excitation coefficient matrix P of the kth RHS unit according to equation (11); Among them, v (k) F c The k-th column element of V; Step 3.2.11: Use the elements of the RHS unit excitation coefficient matrix P to obtain the excitation amplitude A of the kth unit of the RHS unit k ; Get a set of A in a loop iteration k ; Step 3.2.12: Obtain the equivalent channel matrix H according to equation (12) reff ; Step 3.2.13: Obtain singular values ​​through singular value decomposition and the left singular vector matrix U reff ; Let the singular value be represented by H reff The sth singular value of ; Step 3.2.14: Calculate the allocated power allocation matrix according to equation (13); Step 3.2.15: Calculate the digital beamforming V according to equation (14); Step 3.2.16: Calculate the sum rate R using equation (15); Step 3.2.17: Execute steps 3.2.2 to 3.2.16 in a loop iteration manner until the difference between the sum rate obtained from the previous calculation and the sum rate obtained is less than the iteration threshold.

4. The method for designing a communication system for a dynamically linked reconfigurable holographic surface according to claim 1, wherein: The implementation method of step 4.2 is: Step 4.2.1: Excite the RHS unit to generate the received signal y as shown in Equation (17) F ; y F =Br (17) where B[n,n]=A n is the excitation matrix, R n ∈[0,1] is the excitation amplitude of each unit, Step 4.2.2: Use the switch selection link to select the outgoing feed source; Step 4.2.3: Connect the signal after the RHS unit excitation to the selected feed source to form the RHS combined signal y as shown in formula (18) v ; y v =W c y F (18) Among them, is the RHS beamforming matrix, λ represents the wavelength of the electromagnetic wave generated by the feed source, f k and s n Represents the direction vector of the selected feed and RHS element, where n=1,2,3.....N and k=1,2,3.....N RF ; Step 4.2.4: Utilize the receiver's combiner Combined signal y on the RHS v Combining to form a received signal as shown in formula (19); y=Wy v (19) Among them, the received signal 5. A communication system design device for a dynamically linked reconfigurable holographic surface implementing the method of claim 1, characterized in that: It includes a precoder module, a transmitter feed selection module, a feed selection module, a transmitter RHS antenna, a receiver RHS antenna, a feed selection module, and a combiner module; The precoder module is used to process the original information stream and output a digital beamforming signal; Will serve as input to the transmitter feed selection module; The transmitter feed selection module is used to process the digital beamforming signal, select its input link, and output the digital beamforming signal; which will serve as the input of the transmitter RHS antenna; The transmitter RHS antenna is used to process the digital beamforming signal and output an overall beamforming signal; The receiver RHS antenna is used to process the signal received by the holographic antenna and output the RHS combined signal, which will serve as the input of the receiver feed selection module; The receiver feed selection module is used to process the RHS combined signal, select its input link, and output the RHS combined signal; which will serve as the input of the combiner module; The combiner module is used to process the RHS combined signal and output a received signal.

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