Three-dimensional near-field coverage method, device and equipment based on RIS array plane

Abstract

The invention discloses a three-dimensional near-field coverage method, device and equipment based on an RIS array plane. The method comprises the following steps: sending a to-be-transmitted user superposition signal generated by a communication base station to the RIS array plane with a plurality of units; designing a channel coefficient from the communication base station to the RIS array plane based on the spatial relationship between the communication base station and the RIS array plane; designing a compensation channel phase offset transmitted by any unit of the RIS array plane based on a spatial relationship between a target user and the RIS array plane; and calculating a user total signal received by the target user according to the channel coefficient and the compensation channel phase offset. By designing the channel coefficient from the communication base station to the RIS array plane and the compensation channel phase deviation transmitted by any unit of the RIS array plane, all communication nodes do not need to be located on the same straight line or the same plane all the time in RIS near-field coverage, and the transmission reliability and effectiveness of an RIS wireless communication system are improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and more specifically, to a three-dimensional near-field coverage method, device and equipment based on a RIS array. Background Art

[0002] As 5G continues to evolve towards 6G, the field of wireless communications faces the challenges of a surge in the number of users and an increasingly complex electromagnetic environment. As a key core technology of 6G, Reconfigurable Intelligent Surface (RIS) has shown great potential to improve the wireless transmission environment. In practical applications, RIS needs to adapt to and change the surrounding wireless transmission environment and dynamically configure the transmission and reflection coefficients. The premise is to obtain complete channel state information, so channel and coverage modeling is very critical but also challenging.

[0003] In RIS-assisted wireless communication systems, the modeling of RIS channels and coverage has always been a research focus. In the existing technology, the main technical means of RIS channels and coverage include a physically feasible Rayleigh fading model for regular rectangular RIS; a far-field and near-field free space path loss model based on electromagnetic radiation beamforming conditions; STAR-RIS near-field and far-field channel models, and its interruption performance under far-field conditions.

[0004] In general, in existing research, only the coverage of RIS for far-field users is usually considered, and there is less discussion on the near field; and generally only one-dimensional uniform linear array RIS model is considered. However, in actual communication systems, the position of users is random, and it is unknown whether the users are in the near field or the far field, and all communication nodes cannot always be located in a straight line or a plane. Specifically, there are few studies on RIS near-field coverage modeling methods based on three-dimensional space, which limits the performance calculation methods of RIS-assisted wireless communication systems. Summary of the invention

[0005] In response to at least one defect or improvement need in the prior art, the present invention provides a three-dimensional near-field coverage method, device and equipment based on a RIS array, which is used to solve the problem in the prior art that during RIS near-field coverage, the user's position is random and all communication nodes cannot always be located in a straight line or a plane, resulting in low transmission reliability and effectiveness of the RIS-assisted wireless communication system.

[0006] To achieve the above object, according to a first aspect of the present invention, a three-dimensional near-field coverage method based on a RIS array is provided, comprising: The user superposition signal to be transmitted generated by the communication base station is sent to the RIS array having a plurality of units; The channel coefficient from the communication base station to the RIS array is designed based on the spatial relationship between the communication base station and the RIS array; Based on the spatial relationship between the target user and the RIS array, a compensating channel phase offset transmitted through any unit of the RIS array is designed; The total user signal received by the target user is calculated based on the channel coefficient and the compensated channel phase offset.

[0007] In a possible implementation, the channel coefficient from the communication base station to the RIS array is designed based on the spatial relationship between the communication base station and the RIS array, including: Establish a spatial rectangular coordinate system with the reference unit in the RIS array as the origin; Designing a first transmission parameter according to a coordinate position of the communication base station in a spatial rectangular coordinate system; The channel coefficient from the communication base station to the RIS array is designed based on the first transmission parameter.

[0008] In a possible implementation manner, designing the first transmission parameter according to the coordinate position of the communication base station in the spatial rectangular coordinate system includes: Calculate the distance from the communication base station to the reference unit of the RIS array according to the coordinate position of the communication base station in the spatial rectangular coordinate system; According to the distance between the communication base station and the reference unit of the RIS array, the elevation angle and azimuth angle of arrival from the communication base station to any unit of the RIS array are designed to be the same.

[0009] In a possible implementation, the channel coefficient includes small-scale fading; and designing the channel coefficient from the communication base station to the RIS array based on the first transmission parameter includes: The phase difference of the signal arriving at any unit of the RIS array and the reference unit is calculated according to the distance from the communication base station to the reference unit and the wavelength of the superimposed signal of the user to be transmitted; Calculate the small-scale fading average value based on signal phase difference, elevation angle and azimuth angle; The small-scale fading is designed according to the small-scale fading average value and the small-scale fading estimation value.

[0010] In a possible implementation, the compensating channel phase offset transmitted through any unit of the RIS array is designed based on the spatial relationship between the target user and the RIS array, including: Calculate a second transmission parameter according to the coordinate position of the target user in the spatial rectangular coordinate system; The compensating channel phase offset of any unit transmission of the RIS array is designed based on the second transmission parameter.

[0011] In a possible implementation manner, calculating the second transmission parameter according to the coordinate position of the target user in the spatial rectangular coordinate system includes: Calculate the distance from the target user to any unit of the RIS array according to the coordinate position of the target user in the spatial rectangular coordinate system; The angle between the target user and any unit of the RIS array is calculated according to the distance between the target user and any unit of the RIS array.

[0012] In a possible implementation manner, calculating a total user signal received by a target user according to a channel coefficient and a compensated channel phase offset includes: Calculate the useful signal received by the target user through any unit of the RIS array according to the channel coefficient and the compensated channel phase offset; All useful signals are accumulated to obtain the total user signal received by the target user.

[0013] According to a second aspect of the present invention, there is also provided a three-dimensional near-field coverage device based on a RIS array, comprising: A signal sending module, which is configured to send the user superposition signal to be transmitted generated by the communication base station to the RIS array having a plurality of units; A first design module is configured to design a channel coefficient from the communication base station to the RIS array based on a spatial relationship between the communication base station and the RIS array; A second design module, which is configured to design a compensating channel phase offset transmitted through any unit of the RIS array based on a spatial relationship between the target user and the RIS array; The calculation module is configured to calculate the total user signal received by the target user according to the channel coefficient and the compensated channel phase offset.

[0014] According to the third aspect of the present invention, there is also provided a three-dimensional near-field coverage device based on a RIS array, which includes at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit executes any step of the three-dimensional near-field coverage method based on the RIS array.

[0015] According to a fourth aspect of the present invention, there is also provided a storage medium storing a computer program executable by an access authentication device, wherein when the computer program runs on the access authentication device, the access authentication device executes any of the steps of the above-mentioned three-dimensional near-field coverage method based on the RIS array.

[0016] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: The present invention provides a three-dimensional near-field coverage method based on a RIS array. A communication base station generates a superimposed signal of a user to be transmitted, and sends the superimposed signal of the user to be transmitted to a RIS array having a plurality of units. Multiple signals can be transmitted to a receiving-end user through the RIS array. A channel coefficient from the communication base station to the RIS array is designed based on a spatial relationship between the communication base station and the RIS array. A compensating channel phase offset transmitted through any unit of the RIS array is designed based on a spatial relationship between a target user and the RIS array. Near-field signal transmission to any receiving-end user in three-dimensional space is realized. There is no requirement for the position of the receiving-end user. It is not necessary for all communication nodes to be always located on a straight line or a plane. It can also ensure that the receiving-end user can accurately receive the transmitted signal, and improve the reliability and effectiveness of near-field transmission of a wireless communication system based on the RIS array. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic flow chart of an embodiment of a three-dimensional near-field coverage method based on a RIS array provided by the present invention; Figure 2 The present invention provides Figure 1 A schematic diagram of a flow chart of an embodiment of step S200; Figure 3 A schematic diagram of a first-hop scenario according to an embodiment of the present invention; Figure 4 The present invention provides Figure 2 A schematic diagram of a scenario of an embodiment of step S230; Figure 5 A schematic diagram of a scenario of an embodiment of a second hop scenario provided by the present invention; Figure 6 A schematic diagram showing a comparison of the transmission-side user coverage probability of the RIS array provided by the present invention and the traditional RIS linear array in three-dimensional space according to an embodiment of the present invention; Figure 7 A schematic diagram showing a comparison of an embodiment of the average transmission-side user rate of the RIS array provided by the present invention and the traditional RIS linear array in three-dimensional space Figure 8 A schematic structural diagram of an embodiment of a three-dimensional near-field coverage device based on a RIS array provided by the present invention; Fig. 9A schematic structural diagram of a three-dimensional near-field coverage device based on a RIS array provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] The terms "first", "second", "third", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0021] The present invention provides a three-dimensional near-field coverage method, device and equipment based on a RIS array, which are described below respectively.

[0022] See also Figure 1 , Figure 1 A flow chart of an embodiment of a three-dimensional near-field coverage method based on a RIS array provided by the present invention. In a specific embodiment of the present invention, a three-dimensional near-field coverage method based on a RIS array is disclosed, comprising: S100, sending the user superposition signal to be transmitted generated by the communication base station to a RIS array having a plurality of units; S200, designing a channel coefficient from the communication base station to the RIS array based on the spatial relationship between the communication base station and the RIS array; S300, designing a compensating channel phase offset transmitted through any unit of the RIS array based on a spatial relationship between the target user and the RIS array; S400: Calculate a total user signal received by a target user according to a channel coefficient and a compensated channel phase offset.

[0023] In the above-mentioned embodiment, the use area of ​​the RIS array-based three-dimensional near-field coverage method provided by the present invention has a certain range limitation. For the convenience of explanation, the present invention uses a cell as its use area, and the RIS array has two characteristics of reflection and refraction, both of which can be used for signal transmission. Therefore, the method of the present invention may include a communication base station covering the cell, at least two users (i.e., target users receiving signals, wherein user R is located on the reflection side of the RIS array, and user T is located on the transmission side of the RIS array) using non-orthogonal multiple access in the cell. M OK N Omnidirectional RIS panels for column units.

[0024] It should be noted that there is no line-of-sight path between the communication base station and the user, and communication can only be carried out through the RIS array using a double-hop relay method. From the communication base station to the RIS array is the first hop scenario, and from the RIS array to the target user is the second hop scenario. In addition, the near field involved in the present invention refers to the distance from the target user to the communication base station is less than In this case, D refers to the antenna aperture, λ refers to the wavelength of the transmitted signal, and λ refers to the operating wavelength.

[0025] The communication base station will superimpose the user superimposed signal to be transmitted Sent to two users, and Represent the independent zero-mean normalized signals transmitted to user T and user R respectively. Then the signal Can be written as: ; The power coefficient allocated to the transmission side user T is , the power coefficient allocated to the user R on the reflection side is , , P is the transmission power of the communication base station.

[0026] The channel coefficient matrices from the communication base station to the RIS array, from the RIS array to the user R, and from the RIS array to the user T are expressed as , , The reflection coefficient and transmission coefficient matrices of RIS are and , then any user The received signal is: ; Where ω is the phase.

[0027] Compared with the prior art, the present embodiment provides a three-dimensional near-field coverage method based on the RIS array, in which a communication base station generates a superimposed signal of a user to be transmitted, and sends the superimposed signal of the user to be transmitted to a RIS array having a plurality of units, and multiple signals can be transmitted to a receiving end user through the RIS array, and a channel coefficient from the communication base station to the RIS array is designed based on a spatial relationship between the communication base station and the RIS array, and a compensating channel phase offset transmitted through any unit of the RIS array is designed based on a spatial relationship between the target user and the RIS array, thereby realizing near-field signal transmission to any receiving end user in three-dimensional space, having no requirements on the position of the receiving end user, not requiring all communication nodes to be always located on a straight line or a plane, and also ensuring that the receiving end user can accurately receive the transmitted signal, and improving the reliability and effectiveness of near-field transmission of a wireless communication system based on the RIS array.

[0028] See also Figure 2 , Figure 2 The present invention provides Figure 1 In some embodiments of the present invention, the channel coefficient from the communication base station to the RIS array is designed based on the spatial relationship between the communication base station and the RIS array, including: S210, establishing a spatial rectangular coordinate system with the reference unit in the RIS array as the origin; S220, designing a first transmission parameter according to the coordinate position of the communication base station in the spatial rectangular coordinate system; S230. Design a channel coefficient from the communication base station to the RIS array based on the first transmission parameter.

[0029] In the above embodiment, one or more physically or logically significant units are selected on the RIS array as reference units. As a preferred embodiment, the reference unit in the present invention is the first unit at the lower left corner of the RIS array. With the reference unit as the origin (0, 0, 0), a three-dimensional rectangular coordinate system is established according to the physical size and layout of the RIS array. Each unit has an area of A The units are arranged closely together in a square. Usually, the X-axis and Y-axis are parallel to the horizontal and vertical directions of the RIS array respectively, and the Z-axis is perpendicular to the RIS array. For the convenience of calculation, the dimensions of the RIS array (such as length and width) can be standardized to a certain unit length, such as meter or wavelength.

[0030] The first transmission parameters include the distance from the communication base station to the reference unit of the RIS array, and the elevation and azimuth angles of arrival from the communication base station to any unit of the RIS array. Use GPS or other positioning technologies to obtain the position of the communication base station in the global or local coordinate system, and convert it to a spatial rectangular coordinate system with the RIS array reference unit as the origin. Based on the coordinate difference between the communication base station and the RIS array reference unit, calculate the straight-line distance between the two (Euclidean distance in three-dimensional space), and design the azimuth and elevation angles of the base station relative to the RIS array. This information is crucial for the subsequent design of beamforming and channel modeling.

[0031] The channel coefficient from the communication base station to the RIS array is written as the product of large-scale fading and small-scale fading, where large-scale fading only affects the amplitude but not the phase shift, and small-scale fading obeys the Rice distribution. Therefore, in order to design the channel coefficient from the communication base station to the RIS array, the main thing is to design small-scale fading. Small-scale fading obeys the Rice distribution, that is, .in, K is the Rice factor, obey , amplitude All obey Rayleigh distribution, and the phase It obeys the uniform distribution within (0, 2π), It can be represented by the array response of the RIS array. It should be noted that represents the estimate of small-scale fading, Represents the average value of small-scale fading.

[0032] See also Figure 3 , Figure 3 A schematic diagram of a scenario of an embodiment of a first hop scenario provided by the present invention. In some embodiments of the present invention, the first transmission parameter is designed according to the coordinate position of the communication base station in the spatial rectangular coordinate system, including: Calculate the distance from the communication base station to the reference unit of the RIS array according to the coordinate position of the communication base station in the spatial rectangular coordinate system; According to the distance between the communication base station and the reference unit of the RIS array, the elevation angle and azimuth angle of arrival from the communication base station to any unit of the RIS array are designed to be the same.

[0033] In the above embodiment, the arrival angles from the communication base station to any unit of the RIS are the same. Assume that the elevation angle and azimuth angle of the signal starting from the base station and arriving at the RIS plane are respectively and , the precise three-dimensional coordinates of the base station can be determined by total station or GPS measurement: ,and The distance from the communication base station to the reference unit of the RIS array is , then the distance , and thus we can determine and Need to meet: .

[0034] See also Figure 4 , Figure 4 The present invention provides Figure 2 A schematic diagram of a scenario of an embodiment of step S230 in the embodiment of the present invention, in some embodiments of the present invention, the channel coefficient includes small-scale fading; designing the channel coefficient from the communication base station to the RIS array based on the first transmission parameter includes: S231, calculating the phase difference of the signal arriving at any unit of the RIS array and the reference unit according to the distance from the communication base station to the reference unit and the wavelength of the superimposed signal of the user to be transmitted; S232, calculating the small-scale fading average value based on the signal phase difference, elevation angle and azimuth angle; S233. Design small-scale fading according to the small-scale fading average value and the small-scale fading estimation value.

[0035] In the above embodiment, the phase shift of the signal from the base station to the cell is ,in is the wavelength of the transmitted signal. Row, No. Column unit (i.e. units, of which ,and ) has a phase difference with the signal reaching the first unit of RIS: ; The signal from the base station to the first unit of RIS lags behind the signal to other units in phase, so the average value of small-scale fading is: ; right After vector synthesis: ,get The expression is: ; in yes The angle between the LoS component and the NLoS component is: .

[0036] See also Figure 5 , Figure 5A schematic diagram of a scenario of an embodiment of a second hop scenario provided by the present invention. In some embodiments of the present invention, a compensating channel phase offset transmitted through any unit of the RIS array is designed based on a spatial relationship between a target user and the RIS array, including: Calculate a second transmission parameter according to the coordinate position of the target user in the spatial rectangular coordinate system; The compensating channel phase offset of any unit transmission of the RIS array is designed based on the second transmission parameter.

[0037] In some embodiments of the present invention, calculating the second transmission parameter according to the coordinate position of the target user in the spatial rectangular coordinate system includes: Calculate the distance from the target user to any unit of the RIS array according to the coordinate position of the target user in the spatial rectangular coordinate system; The angle between the target user and any unit of the RIS array is calculated according to the distance between the target user and any unit of the RIS array.

[0038] In the above embodiment, based on the Fresnel-Kirchhoff diffraction formula, the size of the electromagnetic signal of a point wave source in the wavefront is related to the area of ​​the wavesource block, the signal wavelength, the distance from the wavesource to the wavefront, the angle between the wavesource and the wavefront, etc.

[0039] The second transmission parameter includes the distance from the target user to any unit of the RIS array and the angle between the target user and any unit of the RIS array. According to the coordinates of the target user and the coordinates of each unit of the RIS array, the distance between the target user and each unit of the RIS array can be calculated. indivual( OK The coordinates of the column) cell are ),but: ; in, Indicates user With The distance between RIS units, Is a user With The coordinates of user R are , , the coordinates of user T are , .

[0040] design Compensate for the channel phase offset, that is, ,again , can be written The expression is: .

[0041] In some embodiments of the present invention, calculating the total user signal received by the target user according to the channel coefficient and the compensated channel phase offset includes: Calculate the useful signal received by the target user through any unit of the RIS array according to the channel coefficient and the compensated channel phase offset; All useful signals are accumulated to obtain the total user signal received by the target user.

[0042] In the above embodiment, under near field conditions, RIS units transflective, user The general expression of the received useful signal is: ; Where F() is the transmission and reflection angle function of the RIS unit.

[0043] And the user The general expression for the total received signal is: .

[0044] In the near-field coverage method of the present invention, the instantaneous signal-to-interference-to-noise ratio expression of user T under near-field conditions is: , user T can be covered normally only if , then the final coverage probability in the near field is: ; Where L is the length of the RIS array.

[0045] Using the maximum signal transmission rate in a statistical sense to describe the average rate of the system, the average rate of the transmission-side user is: ; The instantaneous signal-to-interference-noise ratio when user R decodes the signal of user T is: , the signal-to-interference-noise ratio when decoding its own signal is: , the coverage probability in the near field is: ; The instantaneous signal-to-interference-to-noise ratio of the user on the reflection side is , then the average rate is: .

[0046] See also Figure 6 , Figure 6 FIG. 1 is a schematic diagram showing a comparison of the transmission side user coverage probability of the RIS array surface provided by the present invention and the traditional RIS linear array in three-dimensional space. Figure 7 , Figure 7FIG. 1 is a schematic diagram showing a comparison of an embodiment of the average transmission-side user rate of the RIS array surface in three-dimensional space provided by the present invention and the traditional RIS linear array, and ... Figure 6 and attached Figure 7 The performance comparison between the traditional linear array RIS and the planar array RIS proposed in the present invention in three-dimensional space is further described. The existing solutions involved are: Linear array RIS system: The RIS units in the traditional linear array RIS system are evenly arranged in the form of a one-dimensional linear array.

[0047] The simulation parameters are set as follows: It is assumed that the first-hop channel coefficients in the linear array RIS and RIS front scenarios obey the Rice distribution, where the NLOS component obeys independent and identically distributed complex Gaussian fading. Path loss exponent , the path loss at the reference distance is , the size parameters of the surface array RIS are , the size parameters of the linear array RIS are , RIS unit area , Rice factor ,wavelength , the user power allocation coefficient on the transmission side is , the receiving threshold is , the user is in a radius of Evenly distributed in the circular area.

[0048] The idea of ​​the simulation program code is as follows: set parameters to generate random user samples that obey a uniform distribution Then, according to the total received signal expression in the previous text, the expression of each signal to noise ratio is obtained, and then the coverage probability and average rate of the system can be calculated respectively. For the simulation of coverage performance, the coverage performance curve of the present invention is drawn with the transmission signal to noise ratio as the horizontal axis and the coverage probability as the vertical axis. For the simulation of rate performance, The average instantaneous rate of the random channels is obtained by averaging the system ergodic average rate.

[0049] The simulation results show that the coverage probability of the RIS-assisted wireless communication system under near-field channel conditions varies with the signal-to-noise ratio using the traditional model and the three-dimensional uniform array RIS model proposed by the present invention. Figure 6 Compared with the linear array RIS model and the present invention, the performance calculation results are significantly different, and the present invention can significantly improve the accuracy of coverage performance calculation.

[0050] The simulation results show that the average rate of the RIS-assisted wireless communication system under near-field channel conditions varies with the signal-to-noise ratio using the traditional model and the three-dimensional uniform array RIS model proposed by the present invention. Figure 7Compared with the linear array RIS model and the present invention, the performance calculation results are quite different. The present invention can significantly improve the accuracy of rate performance calculation.

[0051] In order to better implement the three-dimensional near-field coverage method based on the RIS array in the embodiment of the present invention, on the basis of the three-dimensional near-field coverage method based on the RIS array, correspondingly, please refer to Figure 8 , Figure 8 The present invention provides a schematic structural diagram of an embodiment of a three-dimensional near-field coverage device based on a RIS array. The present invention provides a three-dimensional near-field coverage device 800 based on a RIS array, including: A signal sending module 810, which is configured to send the user superposition signal to be transmitted generated by the communication base station to the RIS array having a plurality of units; A first design module 820, which is configured to design a channel coefficient from the communication base station to the RIS array based on a spatial relationship between the communication base station and the RIS array; A second design module 830, which is configured to design a compensating channel phase offset transmitted via any unit of the RIS array based on a spatial relationship between the target user and the RIS array; The calculation module 840 is configured to calculate the total user signal received by the target user according to the channel coefficient and the compensated channel phase offset.

[0052] It should be noted here that: the device 800 provided in the above embodiment can implement the technical solutions described in the above method embodiments. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above method embodiments, which will not be repeated here.

[0053] See also Fig. 9 , Fig. 9 A schematic diagram of the structure of a RIS array-based three-dimensional near-field coverage device provided in an embodiment of the present invention. Based on the above-mentioned RIS array-based three-dimensional near-field coverage method, the present invention also provides a RIS array-based three-dimensional near-field coverage device, which can be a computing device such as a mobile terminal, a desktop computer, a notebook, a PDA, and a server. The RIS array-based three-dimensional near-field coverage device 900 includes a processor 910, a memory 920, and a display 930. Fig. 9 Only some components of the synchronous tracking flying welding equipment for real-time measurement of battery height are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0054] In some embodiments, the memory 920 may be an internal storage unit of the RIS-based three-dimensional near-field coverage device 900, such as a hard disk or memory of the RIS-based three-dimensional near-field coverage device 900. In other embodiments, the memory 920 may also be an external storage device of the RIS-based three-dimensional near-field coverage device 900, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the RIS-based three-dimensional near-field coverage device 900. Further, the memory 920 may also include both an internal storage unit of the RIS-based three-dimensional near-field coverage device 900 and an external storage device. The memory 920 is used to store application software and various data installed on the RIS-based three-dimensional near-field coverage device 900, such as a program code for installing the RIS-based three-dimensional near-field coverage device 900. The memory 920 may also be used to temporarily store data that has been output or is to be output. In one embodiment, a RIS array-based three-dimensional near-field coverage program 940 is stored in the memory 920, and the RIS array-based three-dimensional near-field coverage program 940 can be executed by the processor 910, thereby realizing the RIS array-based three-dimensional near-field coverage method of each embodiment of the present application.

[0055] In some embodiments, the processor 910 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 920, such as executing a three-dimensional near-field coverage method based on a RIS array.

[0056] In some embodiments, the display 930 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 930 is used to display information on the RIS array-based three-dimensional near-field coverage device 900 and to display a visualized user interface. The components 910-930 of the RIS array-based three-dimensional near-field coverage device 900 communicate with each other via a system bus.

[0057] In one embodiment, when the processor 910 executes the RIS array-based three-dimensional near-field coverage program 940 in the memory 920 , the steps in the above RIS array-based three-dimensional near-field coverage method are implemented.

[0058] This embodiment further provides a computer-readable storage medium, on which a three-dimensional near-field coverage program based on a RIS array is stored. When the three-dimensional near-field coverage program based on a RIS array is executed by a processor, the following steps are implemented: The user superposition signal to be transmitted generated by the communication base station is sent to the RIS array having a plurality of units; The channel coefficient from the communication base station to the RIS array is designed based on the spatial relationship between the communication base station and the RIS array; Based on the spatial relationship between the target user and the RIS array, a compensating channel phase offset transmitted through any unit of the RIS array is designed; The total user signal received by the target user is calculated based on the channel coefficient and the compensated channel phase offset.

[0059] In summary, the present invention provides a three-dimensional near-field coverage method based on the RIS array, in which a communication base station generates a superimposed signal of a user to be transmitted, and sends the superimposed signal of the user to be transmitted to a RIS array having a plurality of units, and multiple signals can be transmitted to a receiving user through the RIS array. The channel coefficient from the communication base station to the RIS array is designed based on the spatial relationship between the communication base station and the RIS array, and the compensating channel phase offset transmitted through any unit of the RIS array is designed based on the spatial relationship between the target user and the RIS array, thereby realizing near-field signal transmission to any receiving user in three-dimensional space, having no requirements on the position of the receiving user, not requiring all communication nodes to be always located in a straight line or a plane, and ensuring that the receiving user can accurately receive the transmitted signal, and improving the reliability and effectiveness of near-field transmission of the wireless communication system based on the RIS array.

[0060] The present application also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of the above method are implemented. The computer-readable storage medium may include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a micro drive, and a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic card or an optical card, a nanosystem (including a molecular memory IC), or any type of medium or device suitable for storing instructions and / or data.

[0061] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0062] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0063] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0064] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0065] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0066] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, disk or optical disk and other media that can store program codes.

[0067] A person skilled in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable memory, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0068] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-dimensional near-field coverage method based on RIS array, characterized in that: include: The user superposition signal to be transmitted generated by the communication base station is sent to the RIS array having a plurality of units; Designing a channel coefficient from the communication base station to the RIS array based on a spatial relationship between the communication base station and the RIS array; Designing a compensating channel phase offset transmitted through any unit of the RIS array based on a spatial relationship between a target user and the RIS array; A total user signal received by a target user is calculated according to the channel coefficient and the compensated channel phase offset.

2. The three-dimensional near-field coverage method based on the RIS array as claimed in claim 1, characterized in that: The designing of the channel coefficient from the communication base station to the RIS array based on the spatial relationship between the communication base station and the RIS array includes: Establishing a spatial rectangular coordinate system with the reference unit in the RIS array as the origin; Designing a first transmission parameter according to the coordinate position of the communication base station in the spatial rectangular coordinate system; The channel coefficient from the communication base station to the RIS array is designed based on the first transmission parameter.

3. The three-dimensional near-field coverage method based on the RIS array as claimed in claim 2, characterized in that: The designing of the first transmission parameter according to the coordinate position of the communication base station in the spatial rectangular coordinate system comprises: Calculating the distance from the communication base station to the reference unit of the RIS array according to the coordinate position of the communication base station in the spatial rectangular coordinate system; The elevation angle and azimuth angle of arrival from the communication base station to any unit of the RIS array are designed to be the same according to the distance from the communication base station to the reference unit of the RIS array.

4. The three-dimensional near-field coverage method based on the RIS array as claimed in claim 3, characterized in that: The channel coefficient includes small-scale fading; and the channel coefficient from the communication base station to the RIS array is designed based on the first transmission parameter, including: Calculate the phase difference of the signal arriving at any unit of the RIS array and the reference unit according to the distance from the communication base station to the reference unit and the wavelength of the transmitted user superposition signal to be transmitted; Calculate a small-scale fading average value based on the signal phase difference, the elevation angle and the azimuth angle; Small-scale fading is designed according to the small-scale fading average value and the small-scale fading estimation value.

5. The three-dimensional near-field coverage method based on the RIS array as claimed in claim 2, characterized in that: The designing of the compensating channel phase offset transmitted through any unit of the RIS array based on the spatial relationship between the target user and the RIS array comprises: Calculating a second transmission parameter according to the coordinate position of the target user in the spatial rectangular coordinate system; A compensating channel phase offset for transmission of any unit of the RIS array is designed based on the second transmission parameter.

6. The three-dimensional near-field coverage method based on the RIS array as claimed in claim 5, characterized in that: The calculating the second transmission parameter according to the coordinate position of the target user in the spatial rectangular coordinate system includes: Calculating the distance from the target user to any unit of the RIS array according to the coordinate position of the target user in the spatial rectangular coordinate system; The angle between the target user and any unit of the RIS array is calculated according to the distance between the target user and any unit of the RIS array.

7. The three-dimensional near-field coverage method based on the RIS array as claimed in claim 1, characterized in that: The calculating the total user signal received by the target user according to the channel coefficient and the compensated channel phase offset comprises: Calculate the useful signal received by the target user through any unit of the RIS array according to the channel coefficient and the compensated channel phase offset; All the useful signals are accumulated to obtain a total user signal received by the target user.

8. A three-dimensional near-field coverage device based on RIS array, characterized in that: include: A signal sending module, which is configured to send the user superposition signal to be transmitted generated by the communication base station to the RIS array having a plurality of units; A first design module, which is configured to design a channel coefficient from the communication base station to the RIS array based on a spatial relationship between the communication base station and the RIS array; A second design module, which is configured to design a compensating channel phase offset transmitted through any unit of the RIS array based on a spatial relationship between a target user and the RIS array; A calculation module is configured to calculate a total user signal received by a target user according to the channel coefficient and the compensated channel phase offset.

9. A three-dimensional near-field coverage device based on RIS array, characterized in that: It comprises at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit executes the steps of the three-dimensional near-field coverage method based on the RIS array according to any one of claims 1 to 7.

10. A storage medium, characterized in that: It stores a computer program executable by an access authentication device. When the computer program runs on the access authentication device, the access authentication device executes the steps of the three-dimensional near-field coverage method based on the RIS array as described in any one of claims 1 to 7.

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