A communication system design method for a dynamically linked reconfigurable holographic surface

Abstract

The application discloses a communication system design method of a dynamic linked reconfigurable holographic surface and belongs to the wireless communication technical field.The application realizes the method as follows: 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, a digital beam forming signal is input to the holographic antenna through a feed source selected by the switch selection link to form a transmitting signal; 3, a channel matrix is acquired, the feed source position is selected by utilizing an interactive entropy iteration, digital beam forming is realized through power distribution, the RHS unit excitation is realized by utilizing an element-by-element iteration, and the beam forming of the overall signal is completed; 4, a receiving signal is acquired by the receiver through a RHS combiner and a digital signal combiner mode; compared with the prior art, the application improves the communication transmission rate of the reconfigurable holographic surface in the random channel transformation scene.

Description

Technical Field

[0001] This invention relates to a design method for a communication system with a dynamically linked reconfigurable holographic surface, belonging to the field of wireless communication technology, and applied to hybrid beamforming of holographic antennas. Background Technology

[0002] Reconfigurable Holographic Surface (RHS) technology is a cutting-edge research direction in the intersection of communication and electromagnetics in recent years. Its core is to achieve highly flexible and 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, using holographic principles to "encode" a preset electromagnetic field distribution into the surface structure parameters. Unlike traditional phased array antennas, RHS can reconstruct the radiation mode of electromagnetic waves without complex feeding networks by dynamically adjusting the electromagnetic response (amplitude) of each unit, and can generate holographic beams with specific directions, polarizations, and waveforms in real time. Its outstanding advantages lie in its lightweight hardware structure, low power consumption, and software-defined capabilities, enabling it to adapt to environmental changes. In 6G communication, it can significantly improve spectral efficiency and expand coverage, and it also shows potential in fields such as holographic imaging and radar stealth.

[0003] Current research largely focuses on controlling the radiation direction of RHS antennas through hybrid beamforming to improve communication performance. Among the many existing solutions, the mainstream approach involves digitally beamforming the signal using a pre-encoder and directly transmitting it to the RHS antenna via an RF link. In this design, the feed position on the RHS antenna is fixed and all elements are connected to the communication system. This approach achieves overall beamforming by sequentially designing the pre-encoder and excitation of the RHS elements, thus improving system transmission performance. However, this fixed-feed RHS system only addresses the design of the pre-encoder and element excitation, neglecting the impact of the feed position on the overall beamforming. In scenarios with random channel variations, the fixed feed position affects the signal beamforming design, and the information transmission rate at the transceiver end is impacted by these random channel variations, leading to a loss of communication system transmission performance.

[0004] Therefore, improving the communication transmission rate of reconfigurable holographic surfaces in random channel transformation scenarios has become an urgent problem to be solved. Summary of the Invention

[0005] To address the issue of improving the communication transmission rate of reconfigurable holographic surfaces under random channel transformation scenarios, this invention aims to provide a design method for a communication system of dynamically linked reconfigurable holographic surfaces. This method employs a selection switch link connected to the RHS feed source, feed source selection with cross-entropy minimization, element-wise RHS cell amplitude updates, and power allocation for digital beamforming. By combining these methods in an alternating optimization manner, the adverse effects of random channel transformation are suppressed, thereby improving the RHS communication transmission rate.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] This invention discloses a design method for a communication system using dynamically linked reconfigurable holographic surfaces, applicable to holographic communication, comprising the following steps:

[0008] Step 1: Construct a single-source transmitter and receiver for holographic communication. The transmitter is equipped with a pre-encoder for digital beamforming, a switch selection link for selecting the access feed, and a reconfigurable holographic surface for RHS beamforming. The receiver is equipped with a combiner for digital signal combining, a switch selection link for selecting the output feed, and a reconfigurable holographic surface for RHS beam receiving.

[0009] Step 2: Input the pre-coded digital beamforming signal from the transmitter to the holographic antenna through the feed selected by the switch selection link to form the transmitted signal;

[0010] Step 2.1: Utilize the transmitter's pre-encoder For the original signal stream N S Precoding is performed to form a digital beamforming signal as shown in equation (1);

[0011] x V =Vx (1)

[0012] Among them, the transmitted signal For digital beamforming signals;

[0013] Step 2.2: Input the digital beamforming signal to the holographic antenna through the feed selected by the switch selection link to form the transmitted signal;

[0014] Step 2.2.1: Select the access feed source using the switch selection link;

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

[0016]

[0017] in, This is the RHS beamforming matrix, where λ represents the wavelength of the electromagnetic wave generated by the feed, and 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 transmit signal s as shown in equation (3);

[0019] s = Ax F (3)

[0020] Among them, A[n,n]=A n Let A be the activation matrix. n ∈[0,1] represents the excitation amplitude for each unit.

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

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

[0023]

[0024] Where, r m This represents the direction vector of the receiver's feed source; m and n represent the indices of the receiver and transmitter RHS units, respectively.

[0025] Step 3.2: Select the feed position using interactive entropy iteration, realize digital beamforming through power allocation, and realize RHS unit excitation using element-by-element iteration to complete the beamforming of the overall 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. The initial probability matrix is ​​obtained in the manner shown in equation (5);

[0027]

[0028] in, This represents the probability that the k-th information stream selects the l-th feed source in the initial state; L represents the number of feed sources selected by each information stream.

[0029] Step 3.2.2: Randomly generate C group of feed source locations based on the probability matrix. Generate a set of beamforming matrices in For a dimension of size N RF A matrix of size ×L; In the k-th row, only the l-th element has a value of 1, which means that the k-th information stream has selected the l-th feed source; The RHS beamforming matrix generated based on the selected feed location;

[0030] Step 3.2.3: Calculate a set of sum rates using equation (6).

[0031]

[0032] Step 3.2.4: Sort the sum and rate in descending order as shown in equation (7);

[0033]

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

[0035] Step 3.2.6: Apply equation (8) to the first C e Weighting the combined rates;

[0036]

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

[0038]

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

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

[0041]

[0042] in, It is matrix AF c V is the submatrix after removing the elements of the k-th column, and 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) Representing F c The k-th column element of V;

[0046] Step 3.2.11: Obtain the excitation amplitude A of the k-th RHS element using the elements of the RHS element excitation coefficient matrix P. k Obtain a set of A through iterative loops. 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 ; Make the singular values ​​represented as H reff The s-th singular value;

[0050] Step 3.2.14: Calculate the allocated power distribution 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 a loop until the difference between the sum and the rate obtained from the previous calculation is less than the iteration threshold;

[0057] Step 4: Use a receiver to acquire the received signal through an RHS combiner and a 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: Combine the holographic antenna received signals with the feed source selected by the switch selection link to form the received signal y;

[0061] Step 4.2.1: Excite the RHS unit to receive the signal, forming the received signal y as shown in equation (17). F ;

[0062] y F =Br (17)

[0063] Where B[n,n]=A n Let B be the activation matrix. n ∈[0,1] represents the excitation amplitude for each unit.

[0064] Step 4.2.2: Select the feed source by using the switch to select the link connection;

[0065] Step 4.2.3: Connect the signal excited by the RHS unit to the selected feed source to form the RHS combined signal y as shown in equation (18). v ;

[0066]

[0067] in, This is the RHS beamforming matrix, where λ represents the wavelength of the electromagnetic wave generated by the feed, and 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: Using the receiver's combiner For RHS combined signal y v The signals are combined to form the received signal as shown in equation (19);

[0069] y = Wy v (19)

[0070] Among them, the received signal

[0071] Step 4.3: Obtain the receiver's beamforming using the same execution method as in Step 3;

[0072] Furthermore, this invention discloses a design apparatus for a communication system with a dynamically linked reconfigurable holographic surface, used to implement the above-mentioned method. The design apparatus for a communication system with a dynamically linked reconfigurable holographic surface disclosed in this invention includes a pre-encoder module, a transmitter feed selection module, a transmitter RHS antenna, a receiver RHS antenna, a feed selection module, and a combiner module.

[0073] The pre-encoder module is used to process the raw information stream and output a digital beamforming signal, which will serve as the input to 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 be used as the input of the transmitter's RHS antenna.

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

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

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

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

[0080] 1. In this invention, on a dynamically linked, reconfigurable holographic surface, there are multiple selectable feed sources connected to a switch selection link. Each information path selects a suitable feed source from a set of feed sources via the switch selection link.

[0081] 2. This invention realizes the design of an RHS communication system that dynamically links the feed source selection, precoding design, and RHS unit amplitude completion, thereby maximizing the data rate and improving the information transmission rate of the communication system.

[0082] 3. The dynamic linking RHS communication system design scheme proposed in this invention dynamically modulates the feed position on the RHS antenna according to different environments. The proposed hybrid beamforming design method, through the coupling and alternating iteration of three sub-algorithms, completes the joint design of feed position, precoding, and RHS element amplitude, effectively improving system performance. Attached Figure Description

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

[0084] Figure 2 This is a schematic diagram of the dynamically linked RHS system architecture of the present invention;

[0085] Figure 3 This is a schematic flowchart illustrating the feed selection and digital beamforming matrix and amplitude matrix determination method of the present invention.

[0086] Figure 4 This is a comparison diagram of simulation experiments for the present invention. Detailed Implementation

[0087] To better illustrate the purpose and advantages of this invention, the invention will be further described below with reference to the accompanying drawings and examples. It should be noted that the implementation of this invention is not limited to the following embodiments, and any modifications or alterations made to this invention will fall within the scope of protection of this invention.

[0088] Example

[0089] like Figure 1 As shown in the figure, the specific implementation steps of the communication system design method of dynamically linked reconfigurable holographic surfaces in this embodiment are as follows:

[0090] Step 1: Construct a single-source transmitter and receiver for holographic communication. The transmitter is equipped with a pre-encoder for digital beamforming, a switch selection link for selecting the access feed, and a reconfigurable holographic surface for RHS beamforming. The receiver is equipped with a combiner for digital signal combining, a switch selection link for selecting the output feed, and a reconfigurable holographic surface for RHS beam receiving.

[0091] In the embodiments, the following are employed: Figure 2 In the architecture shown, RHS cells are equidistantly arranged on the reconfigurable holographic surface with a spacing of 0.005m, totaling N = 16 × 16; the feed source is located at the center of a square composed of four adjacent RHS cells. The distance between the transmitter and receiver is 5m, and the reconfigurable holographic surface is center-aligned and placed parallel to each other.

[0092] Step 2: Input the pre-coded digital beamforming signal from the transmitter to the holographic antenna through the feed selected by the switch selection link to form the transmitted signal;

[0093] Step 2.1: Utilize the transmitter's pre-encoder For the original signal stream N S Precoding is performed to form a digital beamforming signal as shown in equation (1);

[0094] x V =Vx (1)

[0095] Among them, the transmitted signal For digital beamforming signals;

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

[0097] Step 2.2: Input the digital beamforming signal to the holographic antenna through the feed selected by the switch selection link to form the transmitted signal;

[0098] Step 2.2.1: Select the access feed source using the switch selection link;

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

[0100]

[0101] in, This is the RHS beamforming matrix, where λ represents the wavelength of the electromagnetic wave generated by the feed, and 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 this embodiment, the generated electromagnetic wavelength is λ = 0.001;

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

[0104]

[0105] Among them, A[n,n]=A n Let A be the activation matrix. n ∈[0,1] represents the excitation amplitude for each unit.

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

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

[0108]

[0109] Where, r m This represents the direction vector of the receiver's feed; m and n represent the indices of the receiver and transmitter RHS units, respectively.

[0110] Step 3.2: Select the feed position using interactive entropy iteration, realize digital beamforming through power allocation, and realize RHS unit excitation using element-by-element iteration to complete the beamforming of the overall 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. The initial probability matrix is ​​obtained in the manner shown in equation (5);

[0112]

[0113] in, This represents the probability that the k-th information stream selects the l-th feed source in the initial state; L represents the number of feed sources selected by each information stream.

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

[0115] Step 3.2.2: Randomly generate C group of feed source locations based on the probability matrix. Generate a set of beamforming matrices in For a dimension of size N RF A matrix of size ×L; In the k-th row, only the l-th element has a value of 1, which means that the k-th information stream has selected the l-th feed source; The RHS beamforming matrix generated based on the selected feed location;

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

[0117] Step 3.2.3: Calculate a set of sum rates using equation (6).

[0118]

[0119] Step 3.2.4: Sort the sum and rate in descending order as shown in equation (7);

[0120]

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

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

[0123] Step 3.2.6: Apply equation (8) to the first C e Weighting the combined rates;

[0124]

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

[0126]

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

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

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

[0130]

[0131] in, It is matrix AF c V is the submatrix after removing the elements of the k-th column, and 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) Representing F c The k-th column element of V;

[0135] Step 3.2.11: Obtain the excitation amplitude A of the k-th RHS element using the elements of the RHS element excitation coefficient matrix P. k Obtain a set of A through iterative loops. 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 ; Make the singular values ​​represented as H reff The s-th singular value;

[0141] Step 3.2.14: Calculate the allocated power distribution 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 a loop until the difference between the sum and the rate obtained from the previous calculation is less than the iteration threshold;

[0148] Step 4: Use a receiver to acquire the received signal through an RHS combiner and a 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: Combine the holographic antenna received signals with the feed source selected by the switch selection link to form the received signal y;

[0152] Step 4.2.1: Excite the RHS unit to receive the signal, forming the received signal y as shown in equation (17). F ;

[0153] y F =Br (17)

[0154] Where B[n,n]=A n Let B be the activation matrix. n ∈[0,1] represents the excitation amplitude for each unit.

[0155] Step 4.2.2: Select the feed source by using the switch to select the link connection;

[0156] Step 4.2.3: Connect the signal excited by the RHS unit to the selected feed source to form the RHS combined signal y as shown in equation (18). v ;

[0157]

[0158]

[0159] in, This is the RHS beamforming matrix, where λ represents the wavelength of the electromagnetic wave generated by the feed, and 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: Using the receiver's combiner For RHS combined signal y v The signals are combined to form the received signal as shown in equation (19);

[0161] y = Wy v (19)

[0162] Among them, the received signal

[0163] Step 4.3: Obtain the receiver's beamforming using the same execution method as in Step 3;

[0164] Furthermore, this embodiment provides a design apparatus for a communication system with a dynamically linked reconfigurable holographic surface, used to implement the above-described method. This embodiment of the design apparatus for a communication system with a dynamically linked reconfigurable holographic surface includes a pre-encoder module, a transmitter feed selection module, a transmitter RHS antenna, a receiver RHS antenna, a feed selection module, and a combiner module.

[0165] The pre-encoder module is used to process the raw information stream and output a digital beamforming signal, which will serve as the input to 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 be used as the input of the transmitter's RHS antenna.

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

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

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

[0171] To further illustrate the advantages of this invention, simulation experimental data will be used for explanation.

[0172] like Figure 4 As shown, under different signal-to-noise ratio (SNR) conditions, the dynamic link RHS system of the present invention outperforms the traditional RHS system in terms of both signal and rate performance. Furthermore, the gap between the two systems gradually widens as the SNR increases, indicating that the dynamic link RHS system has a greater advantage in signal processing and improving transmission rate.

[0173] The above detailed description further illustrates the purpose, technical solution, and beneficial effects of the invention. 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 within the scope of protection of the present invention.

Claims

1. A design method for a communication system using a dynamically linked reconfigurable holographic surface, characterized in that: Includes the following steps, Step 1: Construct a single-source transmitter and receiver for holographic communication. The transmitter is equipped with a pre-encoder for digital beamforming, a switch selection link for selecting the access feed, and a reconfigurable holographic surface for RHS beamforming. The receiver is equipped with a combiner for digital signal combining, a switch selection link for selecting the output feed, and a reconfigurable holographic surface for RHS beam receiving. Step 2: Input the pre-coded digital beamforming signal from the transmitter to the holographic antenna through the feed selected by the switch selection link to form the transmitted signal; Step 2.1: Utilize the transmitter's pre-encoder For the original signal stream N S Pre-encoding is performed to form a digital beamforming signal as shown in equation (1); x V =Vx (1) Among them, the transmitted signal For digital beamforming signals; Step 2.2: Input the digital beamforming signal to the holographic antenna through the feed selected by the switch selection link to form the transmitted signal; Step 3: Obtain the channel matrix and select the feed position using interactive entropy iteration. Implement digital beamforming through power allocation and excite the RHS unit using element-wise iteration to complete the beamforming of the overall signal. Step 3.1: Obtain the channel matrix H using equation (4); Where, r m This represents the direction vector of the receiver's feed; m and n represent the indices of the receiver and transmitter RHS units, respectively. Step 3.2: Select the feed position using interactive entropy iteration, realize digital beamforming through power allocation, and realize RHS unit excitation using element-by-element iteration to complete the beamforming of the overall signal; Step 4: Use a receiver to acquire the received signal through an RHS combiner and a 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 received signals with the feed source selected by the switch selection link to form the received signal y; Step 4.3: Obtain the receiver beamforming using the same execution method as in Step 3.

2. The design method for a communication system with a dynamically linked reconfigurable holographic surface as described in claim 1, characterized in that: Step 2.2 is implemented as follows: Step 2.2.1: Select the access feed source using the switch selection link; Step 2.2.2: Connect the digital beamforming signal to the selected feed source to excite the RHS unit and form the RHS beamforming signal x as shown in equation (2). F ; x F =F c x V (2) in, This is the RHS beamforming matrix, where λ represents the wavelength of the electromagnetic wave generated by the feed, and 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 transmit signal s as shown in equation (3); s=Ax F (3) Among them, A[n,n]=A n Let A be the activation matrix. n ∈[0,1] represents the excitation amplitude for each unit.

3. The design method for a communication system with a dynamically linked reconfigurable holographic surface as described in claim 1, characterized in that: Step 3.2 is implemented as follows: 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. The initial probability matrix is ​​obtained in the manner shown in equation (5); in, This represents the probability that the k-th information stream selects the l-th feed source in the initial state; L represents the number of feed sources selected by each information stream. Step 3.2.2: Randomly generate C group of feed source locations based on the probability matrix. Generate a set of beamforming matrices in For a dimension of size N RF A matrix of size ×L; In the k-th row, only the l-th element has a value of 1, which means that the k-th information stream has selected the l-th feed source; The RHS beamforming matrix generated based on the selected feed location; Step 3.2.3: Calculate a set of sum rates using equation (6). Step 3.2.4: Sort the sum and rate in descending order as shown in equation (7); Step 3.2.5: Select the first C e Sum rate and record feed position Step 3.2.6: Apply equation (8) to the first C e Weighting the combined rates; Step 3.2.7: Update the probability matrix using equation (9); Step 3.2.8: Execute steps 3.2.2 to 3.2.7 in a loop until each row of the probability matrix has only one element that is 1, and obtain the feed selection matrix corresponding to the probability matrix; Step 3.2.9: Calculate the excitation metric matrix C of the k-th RHS unit according to equation (10). k and G k : in, It is matrix AF c V is the submatrix after removing the elements of the k-th column, and 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) Representing F c The k-th column element of V; Step 3.2.11: Obtain the excitation amplitude A of the k-th RHS element using the elements of the RHS element excitation coefficient matrix P. k Obtain a set of A through iterative loops. 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 Make the singular values ​​represented as H reff The s-th singular value; Step 3.2.14: Calculate the allocated power distribution 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 until the difference between the sum and the rate obtained from the previous calculation is less than the iteration threshold.

4. The design method for a communication system with a dynamically linked reconfigurable holographic surface as described in claim 1, characterized in that: Step 4.2 is implemented as follows: Step 4.2.1: Excite the RHS unit to receive the signal, forming the received signal y as shown in equation (17). F ; y F =Br (17) Where B[n,n]=A n Let R be the activation matrix. n ∈[0,1] represents the excitation amplitude for each unit. Step 4.2.2: Select the feed source by using the switch to select the link connection; Step 4.2.3: Connect the signal excited by the RHS unit to the selected feed source to form the RHS combined signal y as shown in equation (18). v ; y v =W c y F (18) in, This is the RHS beamforming matrix, where λ represents the wavelength of the electromagnetic wave generated by the feed, and 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: Using the receiver's combiner For RHS combined signal y v The signals are combined to form the received signal as shown in equation (19); y=Wy v (19) Among them, the received signal 5. A communication system design apparatus for 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 pre-encoder module is used to process the raw information stream and output a digital beamforming signal. It will be used as the 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 be used as the input of the transmitter's RHS antenna. The transmitter RHS antenna is used to process the digital beamforming signal and output the overall beamforming signal. The receiver RHS antenna is used to process the signal received by the holographic antenna and output a combined RHS signal, which will serve as the input to 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; it will be used as the input of the combiner module. The combiner module is used to process the RHS combined signal and output the received signal.

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