A multi-user downlink transmission analysis method based on a clamping antenna system

Abstract

This invention discloses a multi-user downlink transmission analysis method based on a clamped antenna system. It employs a line-of-sight channel modeling method based on geometric location, constructing a large-scale channel gain model dominated by free-space path loss based on the relative positional relationship between the user and the clamped antenna. Downlink transmission models for waveguide multiple access (WMA) and non-orthogonal multiple access (NOA) are derived separately. For different access methods, the interruption probability and average reachability of users are modeled and calculated, thereby achieving a quantitative assessment of system reliability and spectral efficiency. This application can analyze the impact of different transmit powers, user spatial distributions, and clamped antenna deployment parameters on system performance, providing a theoretical basis for access method selection and antenna deployment design in clamped antenna systems, thereby improving the overall transmission performance and resource utilization efficiency of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication systems, and in particular to a multi-user downlink transmission analysis method based on a clamping antenna system. BACKGROUND

[0002] With the rapid development of the fifth generation and subsequent wireless communication technologies, the mobile Internet and Internet of Things application scale continues to expand, and users' demand for high data rates, low latency and high reliability is increasing. Especially in indoor communication, dense user access and other scenarios, traditional wireless communication systems face serious challenges in terms of coverage, spectrum efficiency and interference suppression. In order to meet the communication needs of multiple users accessing at the same time, researching efficient and flexible multiple access technology has become an important direction in the field of wireless communication.

[0003] In recent years, flexible and reconfigurable antenna technology has received widespread attention. By changing the position, structure or activation method of the antenna, the channel conditions can be improved to some extent and the system performance can be improved. However, the traditional reconfigurable antenna scheme is still limited by free space path loss and interference in long-distance propagation or complex environments, making it difficult to balance system coverage and transmission efficiency.

[0004] In order to reduce large-scale propagation loss and enhance the controllability of signal transmission, waveguide-assisted clamping antenna systems have gradually become a new research direction. This system deploys clamping antennas on the waveguide to achieve low-loss transmission of signals in the waveguide and radiate to users at appropriate locations, thereby balancing propagation efficiency and deployment flexibility. In a multi-user communication scenario, introducing appropriate multiple access methods is of great significance to improving system capacity and spectrum utilization efficiency. Currently, waveguide multiple access and non-orthogonal multiple access technologies have been introduced into clamping antenna systems, but the performance differences of different multiple access methods under the influence of user spatial distribution, antenna deployment parameters and other factors lack systematic and unified research.

[0005] Therefore, it is necessary to develop a multi-user downlink transmission analysis method based on a clamping antenna system to solve the above problems. SUMMARY

[0006] The purpose of the present application is to design a multi-user downlink transmission analysis method based on a clamping antenna system to solve the above problems.

[0007] The present application achieves the above-mentioned purpose through the following technical solutions:

[0008] A multi-user downlink transmission analysis method based on a clamping antenna system, comprising the steps of:

[0009] S1, constructing a downlink communication scenario of a waveguide-assisted clamping antenna system;

[0010] S2. Based on the relative geometric positional relationship between the user equipment and the clamping antenna, establish a line-of-sight channel model dominated by free space path loss;

[0011] S3. Based on the channel model, construct multi-user downlink transmission models based on waveguide multiple access and non-orthogonal multiple access respectively;

[0012] S4. Determine the signal-to-interference-plus-noise ratio (SINR) expression for each user based on the received signal model under different access methods;

[0013] S5. Calculate the interruption probability and average reachability to obtain the system transmission performance results under different multiple access methods.

[0014] Specifically, S5 includes:

[0015] S51. Calculation of interruption probability in waveguide multiple access scenario;

[0016] S52. Calculation of average reachable rate in waveguide multiple access scenario;

[0017] S53. Calculation of interrupt probability in non-orthogonal multiple access scenarios;

[0018] S54. Calculation of average reachability in non-orthogonal multiple access scenarios;

[0019] S55. Based on the calculation results of the interruption probability and average reachability, the system transmission performance under waveguide multiple access and non-orthogonal multiple access methods is compared and evaluated.

[0020] Specifically, the interruption probability is used to characterize the probability that the user's received signal-to-interference-plus-noise ratio is lower than a preset threshold, and the average achievable rate is used to characterize the statistical expectation of the user's instantaneous transmission rate.

[0021] Furthermore, S1 specifically includes:

[0022] In waveguide multiple access downlink communication scenarios:

[0023] Construct a downlink wireless communication system supported by a clamping antenna and combined with waveguide multiple access, wherein the access point is connected to two waveguides, each waveguide having a size of Within a rectangular area, one user equipment (UE) is provided with service. A clamping antenna is deployed on each waveguide for signal transmission to the corresponding UE. The position coordinates of the i-th UE and its corresponding clamping antenna are represented as follows: and ,in Indicates the height of the clamped antenna deployment and Each clamp antenna is deployed in a location closest to the user equipment it serves, satisfying... ;

[0024] Assuming each user device is uniformly distributed within this rectangular area, its location distribution can be represented as follows:

[0025] In non-orthogonal multiple access downlink communication scenarios:

[0026] A downlink wireless communication system combining a clamping antenna and non-orthogonal multiple access is constructed. The access point is connected to a waveguide, and a clamping antenna is deployed on the waveguide. The clamping antenna is set at the longitudinal coordinate position of the user equipment closest to the waveguide to minimize the distance between the user equipment and the clamping antenna.

[0027] Assume that the distance between user equipment 1 and the waveguide is always less than the distance between user equipment 2 and the waveguide; to ensure communication fairness among users, a larger transmit power coefficient is allocated to user equipment 2, which is farther away, during the power allocation process; the position coordinates of the user equipment and the clamping antenna are represented as follows: ,

[0028] The coordinates of the clamping antenna in the longitudinal direction satisfy the following: First, define two auxiliary random variables. Since it is assumed that user equipment 1 is always closer to the waveguide than user equipment 2, the x-axis coordinate of the user equipment is represented as: ;

[0029] The y-axis coordinate of the user equipment satisfies: .

[0030] Furthermore, S2 specifically includes:

[0031] When using waveguide multiple access, the line-of-sight link between user equipment i and clamping antenna i is represented as:

[0032] in Here, c represents the free space path loss factor, and c represents the speed of light. Indicates the carrier frequency; similarly, user equipment i and clamping antenna The channel between them is represented as:

[0033] When using non-orthogonal multiple access, the line-of-sight link between user equipment i and the clamping antenna is represented as: .

[0034] Furthermore, S3 specifically includes:

[0035] When using waveguide multiple access, the received signal of user equipment i is:

[0036] in, This represents the transmission symbol sent to the i-th user equipment, and P represents the transmit power of the access point. This indicates that the mean is 0 and the variance is 0. Additive white Gaussian noise; the access point distributes the transmit power equally among the users, that is, allocates power to each user equipment. The transmission power;

[0037] When using non-orthogonal multiple access, the transmitted signal of the clamped antenna is:

[0038] Where P represents the total transmit power of the access point. This represents the unit power information symbol sent to the i-th user device, with parameters... and Let represent the power allocation coefficients assigned to user equipment 1 and user equipment 2, respectively, and let the power allocation coefficients satisfy the constraints. Allocate a larger share of the transmission power to user equipment located at greater distances, and set... Under the above power allocation conditions, the signal received at the i-th user equipment is represented as: .

[0039] Furthermore, S4 specifically includes:

[0040] When using waveguide multiple access, the signal-to-canceling ratio of user equipment i is: ;

[0041] When using non-orthogonal multiple access, the signal-to-dryness ratio of user equipment 1 is: ;

[0042] make , The signal drying ratio of user equipment 2 is: .

[0043] Furthermore, S51 specifically includes:

[0044] definition ,as well as Given a confidence-to-dryness ratio threshold Under the given conditions, the interrupt probability of user equipment 1 is expressed as:

[0045] in, ;

[0046] The cumulative distribution function of Y is expressed as:

[0047] Based on this cumulative distribution function, the interruption probability of user equipment 1 is expressed as:

[0048] in,

[0049] Using the Gauss-Chebyshev quadrature formula, the interruption probability of user equipment 1 is expressed as:

[0050] in N is a constant that determines the approximate accuracy;

[0051] S52 specifically includes:

[0052] Based on the expression for the signal-to-dryness ratio, the expression for the instantaneous achievable rate of user equipment 1 is obtained as follows:

[0053] in ; The probability density function is expressed as:

[0054] The average reachable rate of user equipment UE1 is expressed as:

[0055] make

[0056]

[0057] Then there is

[0058]

[0059] The average reachable rate of user equipment 1 is expressed as:

[0060] in,

[0061] Using the Gauss-Chebyshev quadrature formula, the average reachability of user equipment 1 is expressed as:

[0062] in N is a constant that determines the approximate accuracy;

[0063] S53 specifically includes:

[0064] Given a confidence-dryness ratio threshold Under the given conditions, the outage probability of user equipment UE1 is expressed as:

[0065] in ;

[0066] Therefore, using random variables From the cumulative distribution function, the expression for the interruption probability of user equipment 1 is obtained as follows:

[0067] The interrupt probability of user equipment 2 is expressed as:

[0068] The cumulative distribution function of random variable A is expressed as:

[0069] make The interrupt probability of user equipment 2 is expressed as:

[0070] because We can obtain:

[0071] in, Indicates the transformation of variables Next, the piecewise function corresponding to the above piecewise expression; let , , , , The interrupt probability of user equipment 2 is then expressed as:

[0072] in,

[0073]

[0074]

[0075] There are two boundary cases: when When, the interrupt probability of user equipment 2 is 1; when At that time, the interrupt probability of user equipment 2 is 0;

[0076] S54 specifically includes:

[0077] make , The average reachable rate of user equipment 1 is:

[0078] make , , The instantaneous rate of user equipment 2 is expressed as:

[0079] in , , , ;make

[0080] achievable

[0081] in , , , It is a constant that determines the approximate accuracy.

[0082] The beneficial effects of this invention are:

[0083] Based on the physical structure characteristics and user spatial distribution characteristics of the clamped antenna system, this invention systematically analyzes the transmission performance of different multiple access methods in multi-user downlink communication. Through the proposed method, the performance differences in reliability and spectral efficiency between waveguide multiple access and non-orthogonal multiple access can be quantitatively evaluated under a unified modeling framework. This provides a theoretical basis for the selection of access methods and the design of clamped antenna deployment parameters in the clamped antenna system, thereby improving the overall transmission performance and resource utilization efficiency of the system. Attached Figure Description

[0084] Figure 1 This is a flowchart of the present invention;

[0085] Figure 2 This is a schematic diagram of the downlink transmission scenario of the clamping antenna system based on waveguide multiple access in this invention;

[0086] Figure 3This is a schematic diagram of the downlink transmission scenario of the clamping antenna system based on non-orthogonal multiple access in this invention. Detailed Implementation

[0087] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0088] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0089] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0090] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0092] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0093] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0094] likeFigure 1 As shown, a multi-user downlink transmission analysis method based on a clamping antenna system includes the following steps:

[0095] S1. Construct a downlink communication scenario for a waveguide-assisted clamping antenna system.

[0096] Waveguide Multiple Access

[0097] Consider a downlink wireless communication system supported by a clamping antenna and combined with waveguide multiple access, the system architecture of which is as follows: Figure 2 As shown. The access point is connected to two waveguides, each with a dimension of [missing information]. A rectangular area serves one user equipment (UE). A clamping antenna is deployed on each waveguide for signal transmission to the corresponding UE. The position coordinates of the i-th UE and its corresponding clamping antenna are denoted as follows: and ,in Indicates the height of the clamped antenna deployment and Each clamp antenna is deployed in a location closest to the user equipment it serves, satisfying... .

[0098] Assuming each user device is uniformly distributed within this rectangular area, its location distribution can be represented as follows:

[0099] Non-orthogonal multiple access

[0100] Consider a downlink wireless communication system using a clamping antenna combined with non-orthogonal multiple access, the system architecture of which is as follows: Figure 3 As shown, the access point is connected to a waveguide, and a clamping antenna is deployed on the waveguide. The clamping antenna is positioned at the longitudinal coordinate location of the user equipment closest to the waveguide to minimize the distance between the user equipment and the clamping antenna.

[0101] Assume that the distance between user equipment 1 and the waveguide is always less than the distance between user equipment 2 and the waveguide. To ensure communication fairness among users, a larger transmit power coefficient is allocated to user equipment 2, which is farther away, during the power allocation process. The position coordinates of the user equipment and the clamping antenna are represented as follows:

[0102] The coordinates of the clamping antenna in the longitudinal direction satisfy the following: For ease of description, we first define two auxiliary random variables. Since it is assumed that user equipment UE1 is always closer to the waveguide than user equipment UE2, the x-axis coordinate of the user equipment can be expressed as:

[0103] The y-axis coordinate of the user equipment satisfies

[0104] S2. Based on the relative geometric positional relationship between the user equipment and the clamping antenna, establish a line-of-sight channel model dominated by free space path loss.

[0105] Waveguide Multiple Access

[0106] When using waveguide multiple access, the line-of-sight link between user equipment i and clamping antenna i is represented as follows:

[0107] in Here, c represents the free space path loss factor, and c represents the speed of light. This indicates the carrier frequency. Similarly, user equipment i and clamping antenna... The channel between them can be represented as

[0108] Non-orthogonal multiple access

[0109] When using non-orthogonal multiple access, the line-of-sight link between user equipment i and the clamping antenna is represented as follows:

[0110] S3. Based on the channel model, construct multi-user downlink transmission models based on waveguide multiple access and non-orthogonal multiple access respectively.

[0111] Waveguide Multiple Access

[0112] When using waveguide multiple access, the received signal of user equipment i is:

[0113] in, This represents the transmission symbol sent to the i-th user equipment, and P represents the transmit power of the access point. This indicates that the mean is 0 and the variance is 0. Additive white Gaussian noise. To ensure fairness among users, the access point distributes the transmit power equally among all users, that is, it allocates power to each user equipment. The transmission power.

[0114] Non-orthogonal multiple access

[0115] When using non-orthogonal multiple access, the transmitted signal of the clamped antenna is

[0116] Where P represents the total transmit power of the access point. This represents the unit power information symbol sent to the i-th user equipment. Parameter and Let represent the power allocation coefficients assigned to user equipment 1 and 2, respectively, and let the power allocation coefficients satisfy the constraints. To ensure fairness in communication among users, a larger share of transmission power is allocated to user equipment located at greater distances; therefore, a certain percentage is set. Under the above power allocation conditions, the signal received at the i-th user equipment can be expressed as:

[0117] S4. Determine the signal-to-interference-plus-noise ratio (SINR) expression for each user based on the received signal model under different access methods.

[0118] Waveguide Multiple Access

[0119] When using waveguide multiple access, the signal-to-canceling ratio of user equipment i is:

[0120] Non-orthogonal multiple access

[0121] When using non-orthogonal multiple access, the signal-to-dryness ratio of user equipment 1 is:

[0122] make , The signal drying ratio of user equipment 2 is

[0123] S5. Calculate the interruption probability and average reachability to obtain the system transmission performance results under different multiple access methods.

[0124] This step includes the following sub-steps:

[0125] S51. Calculation of interruption probability in waveguide multiple access scenario.

[0126] For ease of expression, the definition is as follows: ,as well as Given a confidence-to-dryness ratio threshold Under the given conditions, the interrupt probability of user equipment 1 can be expressed as:

[0127] in

[0128] The cumulative distribution function of Y can be expressed as:

[0129] Based on this cumulative distribution function, the interruption probability of user equipment 1 can be expressed as:

[0130] in

[0131] Using the Gauss-Chebyshev quadrature formula, the interruption probability of user equipment 1 can be expressed as:

[0132] in N is a constant that determines the approximate accuracy.

[0133] S52. Calculation of average reachable rate in waveguide multiple access scenario.

[0134] Based on the expression for the signal-to-dryness ratio, the expression for the instantaneous achievable rate of user equipment 1 can be obtained as follows:

[0135] in The probability density function of U can be expressed as:

[0136] The average reachable rate of user equipment UE1 can be expressed as:

[0137] make

[0138]

[0139] Then there is

[0140]

[0141] The average reachable rate of user equipment 1 can be expressed as:

[0142] in

[0143] Using the Gauss-Chebyshev quadrature formula, the average reachability of user equipment 1 can be expressed as:

[0144] in N is a constant that determines the approximate accuracy.

[0145] S53. Calculation of interrupt probability in non-orthogonal multiple access scenarios;

[0146] Given a confidence-dryness ratio threshold Under the given conditions, the outage probability of user equipment UE1 can be expressed as:

[0147] in .

[0148] Therefore, using random variables From the cumulative distribution function, we can obtain the expression for the interruption probability of user equipment 1 as follows:

[0149] The interrupt probability of user equipment 2 can be expressed as:

[0150] The cumulative distribution function of random variable A can be expressed as:

[0151] make Then the interrupt probability of user equipment 2 can be expressed as:

[0152] because , can be obtained

[0153] in, Indicates the transformation of variables Next, the piecewise function corresponding to the above piecewise expression is obtained. Let... , , , , The interrupt probability of user equipment 2 can then be expressed as:

[0154] in

[0155]

[0156]

[0157] There are two boundary cases: when When, the interrupt probability of user equipment 2 is 1; when At that time, the interrupt probability of user equipment 2 is 0.

[0158] S54. Calculation of average reachable rate in non-orthogonal multiple access scenarios.

[0159] make , The average achievable rate of user equipment 1 is

[0160] make , , The instantaneous rate of user equipment 2 can be expressed as:

[0161] in , , , .make

[0162] achievable

[0163] in , , N is a constant that determines the approximate accuracy;

[0164] S55. Based on the calculation results of the interruption probability and average reachability, the system transmission performance under waveguide multiple access and non-orthogonal multiple access methods is compared and evaluated. The proposed performance analysis method can select the access method with lower interruption probability or higher average reachability under different transmit power and background noise conditions.

[0165] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-user downlink transmission analysis method based on a clamping antenna system, characterized in that, Including the following steps: S1. Constructing a downlink communication scenario for a waveguide-assisted clamping antenna system; S2. Based on the relative geometric positional relationship between the user equipment and the clamping antenna, establish a line-of-sight channel model dominated by free space path loss; S3. Based on the channel model, construct multi-user downlink transmission models based on waveguide multiple access and non-orthogonal multiple access respectively; S4. Determine the signal-to-interference-plus-noise ratio (SINR) expression for each user based on the received signal model under different access methods; S5. Calculate the interruption probability and average reachability to obtain the system transmission performance results under different multiple access methods.

2. The multi-user downlink transmission analysis and access method based on a clamping antenna system according to claim 1, characterized in that, Step S5 specifically includes the following sub-steps: S51. Calculation of interruption probability in waveguide multiple access scenario; S52. Calculation of average reachable rate in waveguide multiple access scenario; S53. Calculation of interrupt probability in non-orthogonal multiple access scenarios; S54. Calculation of average reachability in non-orthogonal multiple access scenarios; S55. Based on the calculation results of the interruption probability and average reachability, the system transmission performance under waveguide multiple access and non-orthogonal multiple access methods is compared and evaluated.

3. The multi-user downlink transmission analysis and access method based on a clamping antenna system according to claim 2, characterized in that, The interruption probability is used to characterize the probability that the user's received signal-to-interference-plus-noise ratio is lower than a preset threshold, and the average achievable rate is used to characterize the statistical expectation of the user's instantaneous transmission rate.

4. The multi-user downlink transmission analysis and access method based on a clamping antenna system according to claim 3, characterized in that, S1 specifically includes: In waveguide multiple access downlink communication scenarios: Construct a downlink wireless communication system supported by a clamping antenna and combined with waveguide multiple access, wherein the access point is connected to two waveguides, each waveguide having a size of Within a rectangular area, one user equipment is provided with service. A clamping antenna is deployed on each waveguide for signal transmission to the corresponding user equipment. The position coordinates of each user equipment and its corresponding clamping antenna are respectively represented as follows: and ,in Indicates the height of the clamped antenna deployment and Each clamp antenna is deployed in a location closest to the user equipment it serves, satisfying... ; Assuming each user device is uniformly distributed within this rectangular area, its location distribution can be represented as follows: ； In non-orthogonal multiple access downlink communication scenarios: A downlink wireless communication system combining a clamping antenna and non-orthogonal multiple access is constructed. The access point is connected to a waveguide, and a clamping antenna is deployed on the waveguide. The clamping antenna is set at the longitudinal coordinate position of the user equipment closest to the waveguide to minimize the distance between the user equipment and the clamping antenna. Assume that the distance between user equipment 1 and the waveguide is always less than the distance between user equipment 2 and the waveguide; to ensure communication fairness among users, a larger transmit power coefficient is allocated to user equipment 2, which is farther away, during the power allocation process; the position coordinates of the user equipment and the clamping antenna are represented as follows: The coordinates of the clamping antenna in the longitudinal direction satisfy the following: First, define two auxiliary random variables. Since it is assumed that user equipment 1 is always closer to the waveguide than user equipment 2, the x-axis coordinate of the user equipment is represented as: ； The y-axis coordinate of the user equipment satisfies: 。 5. The multi-user downlink transmission analysis and access method based on a clamping antenna system according to claim 4, characterized in that, S2 specifically includes: When using waveguide multiple access, the user equipment and clamping antenna The line-of-sight link between them is represented as: in This represents the free space path loss factor. Represents the speed of light. Indicates carrier frequency; similarly, user equipment. and clamping antenna The channel between them is represented as: When using non-orthogonal multiple access, the user equipment The line-of-sight link between the clamping antenna and the antenna is represented as: 。 6. The multi-user downlink transmission analysis and access method based on a clamping antenna system according to claim 5, characterized in that, S3 specifically includes: When using waveguide multiple access, the user equipment The received signal is: in, Indicates sending to the Transmission symbols of individual user equipment Indicates the transmit power of the access point. This indicates that the mean is 0 and the variance is 0. Additive white Gaussian noise; the access point distributes the transmit power equally among the users, that is, allocates power to each user equipment. The transmission power; When using non-orthogonal multiple access, the transmitted signal of the clamped antenna is: in, This indicates the total transmit power of the access point. Indicates sending to the Unit power information symbols and parameters of individual user equipment and Let represent the power allocation coefficients assigned to user equipment 1 and user equipment 2, respectively, and let the power allocation coefficients satisfy the constraints. Allocate a larger share of the transmission power to user equipment located at greater distances, and set... Under the above power allocation conditions, the first The signal received at each user equipment is represented as: 。 7. The multi-user downlink transmission analysis and access method based on a clamping antenna system according to claim 6, characterized in that, S4 specifically includes: When using waveguide multiple access, the user equipment The letter drying ratio is: ； When using non-orthogonal multiple access, the signal-to-dryness ratio of user equipment 1 is: ； make , The signal drying ratio of user equipment 2 is: 。 8. The multi-user downlink transmission analysis and access method based on a clamping antenna system according to claim 7, characterized in that, S51 specifically includes: definition ,as well as Given a confidence-to-dryness ratio threshold Under the given conditions, the interrupt probability of user equipment 1 is expressed as: in, ； The cumulative distribution function of Y is expressed as: ， Based on this cumulative distribution function, the interruption probability of user equipment 1 is expressed as: in, Using the Gauss-Chebyshev quadrature formula, the interruption probability of user equipment 1 is expressed as: in , It is a constant that determines the accuracy of the approximation; S52 specifically includes: Based on the expression for the signal-to-dryness ratio, the expression for the instantaneous achievable rate of user equipment 1 is obtained as follows: in ; The probability density function is expressed as: ， The average reachable rate of user equipment UE1 is expressed as: ， make , ， Then we have: The average reachable rate of user equipment 1 is expressed as: in, ， Using the Gauss-Chebyshev quadrature formula, the average reachability of user equipment 1 is expressed as: in , It is a constant that determines the accuracy of the approximation; S53 specifically includes: Given a confidence-dryness ratio threshold Under the given conditions, the outage probability of user equipment UE1 is expressed as: in ; Therefore, using random variables From the cumulative distribution function, the expression for the interruption probability of user equipment 1 is obtained as follows: The interrupt probability of user equipment 2 is expressed as: The cumulative distribution function of random variable A is expressed as: make The interrupt probability of user equipment 2 is expressed as: because We can obtain: in, Indicates the transformation of variables Next, the piecewise function corresponding to the above piecewise expression; let , , , , The interrupt probability of user equipment 2 is then expressed as: in, There are two boundary cases: when When, the interrupt probability of user equipment 2 is 1; when At that time, the interrupt probability of user equipment 2 is 0; S54 specifically includes: make , The average reachable rate of user equipment 1 is: make , , The instantaneous rate of user equipment 2 is expressed as: in , , , ;make We can obtain: in , , N is a constant that determines the approximate accuracy.

Images