CN112492512A - Super-surface communication system, super-surface phase adjusting method and adjusting system - Google Patents
Super-surface communication system, super-surface phase adjusting method and adjusting system Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
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Abstract
The invention relates to a super-surface communication system, a super-surface phase adjusting method and a super-surface phase adjusting system. The super-surface communication system comprises: a transflective super surface and a base station; a communication link is arranged among the transflective super surface, the base station and a user; the transflective super-surface comprises a plurality of super-surface units, each super-surface unit comprises a plurality of diodes, and the phases of the super-surface units are adjusted by adjusting the on-off of the diodes, so that the phases of multiple paths of signals received by the user through the communication link are the same. The method can simultaneously serve users in all directions at 360 degrees, improve the communication quality of cell edge users and expand the service range of the base station.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a super-surface communication system, a super-surface phase adjustment method, and a super-surface phase adjustment system.
Background
The existing reflection super-surface communication system aims at improving the strength of a user receiving signal under the condition that a base station and a user direct link are poor and the user can receive a reflection signal, but the communication quality of the user at the other side of the reflection super-surface cannot be improved, and the user communication in all directions cannot be simultaneously served in all directions, so that the existing reflection super-surface communication system has the problems of poor communication quality of users at the edge of a cell and small service range of the base station.
Disclosure of Invention
The invention aims to provide a super-surface communication system, a super-surface phase adjusting method and a super-surface phase adjusting system, and aims to solve the problems that the edge users of a cell of the existing reflection super-surface communication system are poor in communication quality and small in service range of a base station.
In order to achieve the purpose, the invention provides the following scheme:
a super-surface communication system, comprising: a transflective super surface and a base station;
a communication link is arranged among the transflective super surface, the base station and a user; the communication link comprises a direct link, a reflective link, and a transmissive link; the direct link is a communication link which is directly transmitted to a user by the base station; the reflection link is a communication link of the user which is reflected to the same side of the base station after the signal of the base station is received by the transflective super surface; the transmission link is a communication link which is transmitted to the user on the other side of the base station after the super surface receives the signal of the base station;
the transflective super-surface comprises a plurality of super-surface units, each super-surface unit comprises a plurality of diodes, and the phases of the super-surface units are adjusted by adjusting the on-off of the diodes, so that the phases of multiple paths of signals received by the user through the communication link are the same.
Optionally, for any of the super-surface units, the gain of the outgoing signal compared to the incoming signal is:
Optionally, when
In order to transmit the gain of the signal,
wherein the content of the first and second substances,
the included angle between an emergent signal of a user i and a z axis vertical to the super-surface unit is formed;
when in use
In order to transmit the gain of the signal,
where ε is the power ratio of the transmitted signal to the reflected signal.
A method of phase tuning a transflective super-surface, comprising:
acquiring a first distance between a transflective super surface and a base station, a second distance between the transflective super surface and a user, and a third distance between the base station and the user;
determining a first Rice channel for any super-surface unit on the transflective super-surface to reach the user according to the first distance and the second distance; the first rice channel comprises a rice signal on a reflective link and a rice channel on a transmissive link;
determining a second Rice channel on the direct connection link according to the third distance;
determining the total downlink transmission rate of multiple users according to the first Rice channel and the second Rice channel;
determining a phase of the super-surface unit from the first distance, the second distance, and the third distance;
and adjusting the phase of the super-surface unit by using a branch-and-bound method based on the total downlink transmission rate of the multiple users to determine the optimal phase of the super-surface unit, so that the phases of the multiple channels of signals received by the users are the same.
Optionally, the determining that any super-surface unit on the transflective super-surface reaches the first rice channel of the user according to the first distance and the second distance specifically includes:
determining a traditional Rayleigh channel according to the first distance and the second distance;
based on the conventional Rayleigh channel, according to a formula
Determining that any super-surface element on the transflective super-surface reaches a first Rice channel of the user; wherein h ismIs a first Rice channel; κ is a constant determined by the propagation environment;
is a conventional rayleigh channel.
Optionally, the determining a total downlink transmission rate of multiple users according to the first rice channel and the second rice channel specifically includes:
by using
Determining the total downlink transmission rate of multiple users; wherein R isMultiple purposeDownlink transmission for multiple usersA rate; n is the total number of users; n is the current user number; p is the transmitting signal power of the base station; h isnIs the sum of the channels of user n; sigma2Is the gaussian noise power.
Optionally, the determining the phase of the super-surface unit according to the first distance, the second distance, and the third distance specifically includes:
according to the formula
Determining a phase of the super surface unit; wherein psimIs the phase of the super surface unit; dBS，mDistance between the base station and the super surface unit; dm，MUDistance of the super surface unit from the user; dBS，MUIs the distance from the base station to the user; λ is the signal wavelength; m is the total number of the super surface units, and M is the serial number of the super surface units.
Optionally, the adjusting, based on the total downlink transmission rate of the multiple users, the phase of the super surface unit by using a branch-and-bound method to determine the optimal phase of the super surface unit, so that the phases of multiple channels of signals received by the users are the same specifically includes:
judging whether the phase of the super-surface unit meets an optimal phase condition or not based on the total downlink transmission rate of the multiple users to obtain a first judgment result; the optimal phase condition is
Wherein the content of the first and second substances,
the optimal phase is obtained; delta psi is unit phase interval, and l is phase sequence number in the super-surface unit;
if the first judgment result shows that the phase of the super-surface unit meets the optimal phase condition, determining the phase of the super-surface unit as the optimal phase;
and if the first judgment result shows that the phase of the super-surface unit does not meet the optimal phase condition, adjusting the phase of the super-surface unit by using a branch-and-bound method to determine the optimal phase of the super-surface unit.
A phase adjustment system for a transflective super-surface, comprising:
the distance acquisition module is used for acquiring a first distance between a transflective super surface and a base station, a second distance between the transflective super surface and a user and a third distance between the base station and the user;
a first rice channel determining module, configured to determine, according to the first distance and the second distance, that any super-surface unit on the transflective super-surface reaches a first rice channel of the user; the first rice channel comprises a rice signal on a reflective link and a rice channel on a transmissive link;
a second rice channel determining module, configured to determine, according to the third distance, a second rice channel on the direct link;
a determining module for determining a total downlink transmission rate of multiple users, configured to determine the total downlink transmission rate of the multiple users according to the first rice channel and the second rice channel;
a phase determination module of the super-surface unit, configured to determine a phase of the super-surface unit according to the first distance, the second distance, and the third distance;
and the optimal phase determining module is used for adjusting the phase of the super surface unit by using a branch-and-bound method based on the total downlink transmission rate of the multiple users to determine the optimal phase of the super surface unit, so that the phases of multiple paths of signals received by the users are the same.
Optionally, the first rice channel determining module specifically includes:
a conventional rayleigh channel determining unit, configured to determine a conventional rayleigh channel according to the first distance and the second distance;
a first Rice channel determining unit for determining a first Rice channel based on the conventional Rayleigh channel according to a formula
Determining that any super-surface element on the transflective super-surface reaches a first Rice channel of the user; wherein h ismIs a first Rice channel; κ is a constant determined by the propagation environment;
is a conventional rayleigh channel.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a super-surface communication system, a super-surface phase adjusting method and a super-surface phase adjusting system, which realize the transmission and reflection of signals by utilizing a transflective super-surface, and can simultaneously serve users in all directions at 360 degrees; in addition, the transflective super surface is deployed at the edge of the cell, so that the communication quality of users at the edge of the cell is effectively improved, and the service range of the base station is expanded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a super-surface communication system according to the present invention;
FIG. 2 is a schematic view of the angles provided by the present invention;
FIG. 3 is a signal transmission diagram of a communication link provided by the present invention;
FIG. 4 is a flow chart of a phase adjustment method for a transflective super surface according to the present invention;
FIG. 5 is a block diagram of a phase adjustment system for a transflective super surface according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a super-surface communication system, a super-surface phase adjusting method and a super-surface phase adjusting system, which can simultaneously serve users in all directions at 360 degrees, improve the communication quality of cell edge users and expand the service range of a base station.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a super-surface communication system provided by the present invention, and as shown in fig. 1, a super-surface communication system includes: a transflective super surface and a base station; a communication link is arranged among the transflective super surface, the base station and a user; the communication link comprises a direct link, a reflective link, and a transmissive link; the direct link is a communication link (as in a conventional cellular communication network) where the base station transmits directly to the user; the reflection link is a communication link of the user which is reflected to the same side of the base station after the signal of the base station is received by the transflective super surface; the transmission link is a communication link which is transmitted to the user on the other side of the base station after the super surface receives the signal of the base station; the transflective super-surface comprises a plurality of super-surface units, each super-surface unit comprises a plurality of diodes, and the phases of the super-surface units are adjusted by adjusting the on-off of the diodes, so that the phases of multiple paths of signals received by the user through the communication link are the same; wherein the properties of the reflective link and the transmissive link are determined by the super-surface.
In practical application, the transflective super-surface comprises a plurality of super-surface units, the super-surface units are adjustable phase units, and the phase difference between an outgoing signal (including a transmission signal and a reflection signal) and an incoming signal of each unit can be independently designed; the multiple units jointly perform beamforming, and directionally, transparently and reflects the received signals from the base station to a specified position. The invention improves the signal by utilizing the phase-controllable transflective super surface, can realize the enhancement of downlink communication, and improves the power of the signal received by a user, thereby improving the communication transmission rate.
The super-surface is formed by orderly arranging a plurality of super-surface units, and each unit comprises a plurality of diodes. The phase adjustment can be performed by adjusting the on/off of the diode. Assuming that each cell contains S phases, denoted l delta psi, where,
each unit transmits and reflects the received signal according to the power proportion, and the power ratio of the transmitted signal to the reflected signal is recorded as epsilon; the transmission and reflection signals are respectively sent to different users on two sides, so that the received signal intensity of the users is enhanced simultaneously; ε has an effect on the specific signal strength on both sides (as follows)
The expression of (c), the difference in the values thereof affects the result of the final phase design; the mathematical expression of the optimization problem affected by the epsilon is given in step 1. The gain of the incident signal of cell m is denoted as K, the gain of the incident signal of cell m being different for the incident, transmitted and reflected signals in each directionA＝(m)＝|cos3θA(m) |, the transmission and reflection signal gains to user i are written as:
with the upper being the reflected signal gain and the lower being the transmitted signal gain. The angles are shown in FIG. 2, thetaAThe angle of the incident signal to the z-axis perpendicular to the cell,
is the angle between the outgoing signal of user i and the z-axis perpendicular to the super-surface unit。
For a super-surface element m, the gain of the outgoing signal compared to the incoming signal may be expressed as
Where G is the antenna gain of the cell, is a constant, δ is the cell area, ψmIs the cell phase.
Based on the characteristics of the super-surface units, the phases of a plurality of units can be jointly designed, so that the phases of the multi-path signals received by the user are the same, the signal intensity received by the user is maximized, and the total transmission rate of the network is improved.
Fig. 3 is a communication link signal transmission diagram provided by the present invention, and as shown in fig. 3, a user may receive a direct connection signal (which may have poor quality) from a base station through the direct connection link. In addition, signals of the base station are received by the super surface units, each unit carries out phase adjustment on the received signals, and description of proportion is added in a figure of simultaneous transmission and reflection (according to a certain proportion, the specific proportion is determined by the super surface materials) of the adjusted signals, the ratio of transmission signal energy to reflection signal energy is epsilon, the value of epsilon is determined by the structure of the super surface materials and the like, and the epsilon is a fixed value for a super surface. The user receives the transmission/reflection signal from the hyperplane (whether transmission or reflection is determined by the position), and the direct connection signal can be enhanced, so that the received signal strength is improved; wherein, the MU1 and the MU2 are the user 1 and the user 2; h1，H2Receive the sum of the channel gains for users 1 and 2; z is a radical of1，z2To receive symbols;
for the k-th antenna transmission, through super surface element m, to the channel gain of user 1/2.
Fig. 4 is a flowchart of a phase adjustment method for a transflective super surface according to the present invention, and as shown in fig. 4, the phase adjustment method for the transflective super surface includes:
step 401: a first distance between a transflective super surface and a base station, a second distance between the transflective super surface and a user, and a third distance between the base station and the user are obtained.
Step 402: determining a first Rice channel for any super-surface unit on the transflective super-surface to reach the user according to the first distance and the second distance; the first rice channel includes a rice signal on a reflective link and a rice channel on a transmissive link.
The step 402 specifically includes: determining a traditional Rayleigh channel according to the first distance and the second distance; based on the conventional Rayleigh channel, according to a formula
Determining that any super-surface element on the transflective super-surface reaches a first Rice channel of the user; wherein h ismIs a first Rice channel; κ is a constant determined by the propagation environment;
is a conventional rayleigh channel.
Step 403: and determining a second Rice channel on the direct link according to the third distance.
Step 404: and determining the total downlink transmission rate of multiple users according to the first Rice channel and the second Rice channel.
The step 404 specifically includes: by using
Determining the total downlink transmission rate of multiple users; wherein R isMultiple purposeA total rate of downlink transmission for multiple users; n is the total number of users; n is the current user number; p is the transmitting signal power of the base station; h isnIs the sum of the channels of user n; sigma2Is the gaussian noise power.
Step 405: determining a phase of the super surface unit from the first distance, the second distance, and the third distance.
Said step 405 comprises the following steps: according to the formula
Determining a phase of the super surface unit; wherein psimIs the phase of the super surface unit; dBS，mDistance between the base station and the super surface unit; dm，MUDistance of the super surface unit from the user; dBS，MUIs the distance from the base station to the user; λ is the signal wavelength; m is the total number of the super surface units, and M is the serial number of the super surface units.
Step 406: and adjusting the phase of the super-surface unit by using a branch-and-bound method based on the total downlink transmission rate of the multiple users to determine the optimal phase of the super-surface unit, so that the phases of the multiple channels of signals received by the users are the same.
The step 406 specifically includes: judging whether the phase of the super-surface unit meets an optimal phase condition or not based on the total downlink transmission rate of the multiple users to obtain a first judgment result; the optimal phase condition is
Wherein the content of the first and second substances,
the optimal phase is obtained; delta psi is unit phase interval, and l is phase sequence number in the super-surface unit; if the first judgment result shows that the phase of the super-surface unit meets the optimal phase condition, determining the phase of the super-surface unit as the optimal phase; and if the first judgment result shows that the phase of the super-surface unit does not meet the optimal phase condition, adjusting the phase of the super-surface unit by using a branch-and-bound method to determine the optimal phase of the super-surface unit.
The phase adjusting method based on the transflective super surface provided by the invention is applied to practice, and comprises the following specific steps:
step 1: and designing the super surface phase in a continuous state.
First, the case where there is only one user will be discussed. In the phase-controllable transflection and reflection super-surface communication system described above, the transmission/reflection channel to a user via super-surface element m can be written as the following Rice channel expression
Where k is a constant determined by the propagation environment,
the expression is as follows,
where λ is the signal wavelength, G, F, etc. are the antenna gains for transmission and reception, exp (…) is the transmission phase outside the influence of the super-surface element, dBS，mDistance of base station from super surface unit, dm，MUFor the distance of the super-surface unit from the user,
is a conventional rayleigh channel.
The direct link from the base station to the user can also be written as a rice channel in a similar fashion to the above, denoted hD. For a user, the received signal is the sum of the signals from the channels. The sum of the channels can be represented as:
i.e., the sum of the transmitted/reflected link channel and the direct link channel of each super surface unit, and therefore, the goal is to maximize the user downlink transmission rate, which can be written as:
wherein P is the base stationThe power of the transmitted signal, which can be considered given, σ2Is the gaussian noise power.
For a single user, knowing their location, when the phase of each cell's transmitted/reflected signal (i.e., phase of each cell's transmitted/reflected signal) is known
Medium phase) with the phase exp (-j2 π d of the direct pathBS，MUIs the same (where d)BS，MUThe distance from the base station to the user), the strongest signal reception power can be obtained, and the following relation is satisfied:
wherein d isBS，MUIs base station to user distance, dBS，mDistance of base station to cell m, dm，MUIs the distance of the cell m from the user.
For the multi-user case, the total received signal strength of multiple users can be written as a convex problem designed for each unit phase and obtained by solving through a convex optimization processing tool.
The total downlink transmission rate of multiple users is written as:
wherein h isiThe sum of all channels of the user i corresponds to h in a single user. Phase ψ of the above equation for each super surface unitmAre all convex functions; for M elements on the super-surface, the optimal phase for each element can be iteratively found in turn.
The concrete mode is as follows: firstly, giving an arbitrary phase value to the units 2-M, and solving the optimal phase of the unit 1 by a convex optimization tool of MATLAB. Then, the value and the phase values of the units 3-M are given, and the optimal phase of the unit 2 is solved by a convex optimization tool of MATLAB. And so on until the phase of each element is updated once. The process of updating the phase of each cell once is called an iteration. The algorithm iterates in a loop until the total downlink transmission rate of multiple users is increased by one iteration to be smaller than a given threshold value omega. At this time, the iteration is finished, and the obtained phase of each unit is the result obtained in step 1.
Step 2: and designing the super surface phase in a discrete state.
The solution found in step 1 is not necessarily available because of the limited number of states per cell in an actual system. After step 1, the optimum phase of the cell m found in step 1 is recorded as
Since this problem is a convex problem, the optimal solution in the discrete state must be one of l Δ ψ and (l +1) Δ ψ, satisfying
For the whole super surface, the optimal solution of each unit is an alternative, and the final optimal solution can be efficiently solved through classical algorithms such as a branch-and-bound method. For a total of M units, there are 2 hypersurfacesMA potential optimal solution.
First, given any one phase state, its corresponding downlink total rate is referred to as the "lower bound" of the answer. In the branch-and-bound method, a search is performed along a binary tree. The state of each node in the binary tree containing M elements, #mThere are three states of (1): the states of all cells at the root node of the binary tree are "undetermined". The root node has two child nodes, and one cell at a child node can be changed from undetermined to two determined potential states, such as psi of cell mmL Δ ψ and ψmFor all undetermined cells, a potential answer "upper bound" may be given, when this "upper bound" is less than the current "lower bound", it is stated that the optimal solution is not obtained on this sub-tree, and thus pruned.When the answer is received, the answer is updated to a new lower boundary so as to improve the pruning efficiency. And (3) when all the nodes in the binary tree are accessed or pruned, ending the algorithm, wherein the lower boundary is the result obtained in the step (2).
Fig. 5 is a structural diagram of a phase adjustment system of a transflective super surface provided in the present invention, and as shown in fig. 5, a phase adjustment system of a transflective super surface includes:
a distance obtaining module 501, configured to obtain a first distance between a transflective super surface and a base station, a second distance between the transflective super surface and a user, and a third distance between the base station and the user.
A first rice channel determining module 502, configured to determine, according to the first distance and the second distance, a first rice channel in which any super-surface unit on the transflective super-surface reaches the user; the first rice channel includes a rice signal on a reflective link and a rice channel on a transmissive link.
The first rice channel determining module 502 specifically includes: a conventional rayleigh channel determining unit, configured to determine a conventional rayleigh channel according to the first distance and the second distance; a first Rice channel determining unit for determining a first Rice channel based on the conventional Rayleigh channel according to a formula
Determining that any super-surface element on the transflective super-surface reaches a first Rice channel of the user; wherein h ismIs a first Rice channel; κ is a constant determined by the propagation environment;
is a conventional rayleigh channel.
A second rice channel determining module 503, configured to determine a second rice channel on the direct link according to the third distance.
A module 504 for determining a total downlink transmission rate of multiple users is configured to determine the total downlink transmission rate of multiple users according to the first rice channel and the second rice channel.
A phase determining module 505 for the super surface unit, configured to determine the phase of the super surface unit according to the first distance, the second distance, and the third distance.
An optimal phase determining module 506, configured to adjust the phase of the super-surface unit by using a branch-and-bound method based on the total downlink transmission rate of the multiple users, so as to determine the optimal phase of the super-surface unit, where the phases of multiple channels of signals received by the users are the same.
In practical application, the conventional super-surface is mainly a reflective super-surface and does not have a transmission function, but the service range can be expanded and the communication quality can be improved by deploying additional relay nodes, but additional energy supply is required. The invention can provide service for users at two sides of the super surface by utilizing the transflective super surface without adding additional relay nodes, can expand the service range based on the communication link and improve the communication quality and efficiency.
Meanwhile, based on the optimal phase design, the total user speed reaches the maximum value.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A super-surface communication system, comprising: a transflective super surface and a base station;
a communication link is arranged among the transflective super surface, the base station and a user; the communication link comprises a direct link, a reflective link, and a transmissive link; the direct link is a communication link which is directly transmitted to a user by the base station; the reflection link is a communication link of the user which is reflected to the same side of the base station after the signal of the base station is received by the transflective super surface; the transmission link is a communication link which is transmitted to the user on the other side of the base station after the super surface receives the signal of the base station;
the transflective super-surface comprises a plurality of super-surface units, each super-surface unit comprises a plurality of diodes, and the phases of the super-surface units are adjusted by adjusting the on-off of the diodes, so that the phases of multiple paths of signals received by the user through the communication link are the same.
2. The super-surface communication system according to claim 1, wherein for any of the super-surface units, the gain of the outgoing signal compared to the incoming signal is:
3. The super surface communication system of claim 2,
when in use
In order to transmit the gain of the signal,
wherein the content of the first and second substances,
the included angle between an emergent signal of a user i and a z axis vertical to the super-surface unit is formed;
when in use
In order to transmit the gain of the signal,
where ε is the power ratio of the transmitted signal to the reflected signal.
4. A phase adjustment method for a transflective super surface, the phase adjustment method being applied to the super surface communication system according to any one of claims 1 to 3, the phase adjustment method comprising:
acquiring a first distance between a transflective super surface and a base station, a second distance between the transflective super surface and a user, and a third distance between the base station and the user;
determining a first Rice channel for any super-surface unit on the transflective super-surface to reach the user according to the first distance and the second distance; the first rice channel comprises a rice signal on a reflective link and a rice channel on a transmissive link;
determining a second Rice channel on the direct connection link according to the third distance;
determining the total downlink transmission rate of multiple users according to the first Rice channel and the second Rice channel;
determining a phase of the super-surface unit from the first distance, the second distance, and the third distance;
and adjusting the phase of the super-surface unit by using a branch-and-bound method based on the total downlink transmission rate of the multiple users to determine the optimal phase of the super-surface unit, so that the phases of the multiple channels of signals received by the users are the same.
5. The method of claim 4, wherein the determining a first Rice channel for any super surface unit on the transflective super surface to reach the user according to the first distance and the second distance comprises:
determining a traditional Rayleigh channel according to the first distance and the second distance;
based on the conventional Rayleigh channel, according to a formula
Determining that any super-surface element on the transflective super-surface reaches a first Rice channel of the user; wherein h ismIs a first Rice channel; κ is a constant determined by the propagation environment;
is a conventional rayleigh channel.
6. The method of claim 5, wherein the determining the total downlink transmission rate of multiple users according to the first rice channel and the second rice channel specifically comprises:
by using
Determining the total downlink transmission rate of multiple users; wherein R isMultiple purposeA total rate of downlink transmission for multiple users; n is the total number of users; n is the current user number; p is the transmitting signal power of the base station; h isnIs the sum of the channels of user n; sigma2Is the gaussian noise power.
7. The method for adjusting phase of a transflective super surface according to claim 6, wherein the determining the phase of the super surface unit according to the first distance, the second distance and the third distance specifically comprises:
according to the formula
Determining a phase of the super surface unit; wherein psimIs the phase of the super surface unit; dBS，mDistance between the base station and the super surface unit; dm，MUDistance of the super surface unit from the user; dBS，MUIs the distance from the base station to the user; λ is the signal wavelength; m is the total number of the super surface units, and M is the serial number of the super surface units.
8. The method according to claim 7, wherein the adjusting the phase of the super-surface unit by using a branch-and-bound method based on the total downlink transmission rate of the multiple users to determine the optimal phase of the super-surface unit so that the multiple signals received by the users have the same phase specifically comprises:
judging whether the phase of the super-surface unit meets an optimal phase condition or not based on the total downlink transmission rate of the multiple users to obtain a first judgment result; the optimal phase condition is
Wherein the content of the first and second substances,
the optimal phase is obtained; delta psi is unit phase interval, and l is phase sequence number in the super-surface unit;
if the first judgment result shows that the phase of the super-surface unit meets the optimal phase condition, determining the phase of the super-surface unit as the optimal phase;
and if the first judgment result shows that the phase of the super-surface unit does not meet the optimal phase condition, adjusting the phase of the super-surface unit by using a branch-and-bound method to determine the optimal phase of the super-surface unit.
9. A phase adjustment system for a transflective super surface, comprising:
the distance acquisition module is used for acquiring a first distance between a transflective super surface and a base station, a second distance between the transflective super surface and a user and a third distance between the base station and the user;
a first rice channel determining module, configured to determine, according to the first distance and the second distance, that any super-surface unit on the transflective super-surface reaches a first rice channel of the user; the first rice channel comprises a rice signal on a reflective link and a rice channel on a transmissive link;
a second rice channel determining module, configured to determine, according to the third distance, a second rice channel on the direct link;
a determining module for determining a total downlink transmission rate of multiple users, configured to determine the total downlink transmission rate of the multiple users according to the first rice channel and the second rice channel;
a phase determination module of the super-surface unit, configured to determine a phase of the super-surface unit according to the first distance, the second distance, and the third distance;
and the optimal phase determining module is used for adjusting the phase of the super surface unit by using a branch-and-bound method based on the total downlink transmission rate of the multiple users to determine the optimal phase of the super surface unit, so that the phases of multiple paths of signals received by the users are the same.
10. The system of claim 9, wherein the first rice channel determining module further comprises:
a conventional rayleigh channel determining unit, configured to determine a conventional rayleigh channel according to the first distance and the second distance;
a first Rice channel determining unit for determining a first Rice channel based on the conventional Rayleigh channel according to a formula
Determining that any super-surface element on the transflective super-surface reaches a first Rice channel of the user; wherein h ismIs a first Rice channel; κ is a constant determined by the propagation environment;
is a conventional rayleigh channel.
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