CN117560048A - Multiple access transmission method and device based on reconfigurable intelligent surface - Google Patents
Multiple access transmission method and device based on reconfigurable intelligent surface Download PDFInfo
- Publication number
- CN117560048A CN117560048A CN202410044172.2A CN202410044172A CN117560048A CN 117560048 A CN117560048 A CN 117560048A CN 202410044172 A CN202410044172 A CN 202410044172A CN 117560048 A CN117560048 A CN 117560048A
- Authority
- CN
- China
- Prior art keywords
- representing
- user
- users
- intelligent surface
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 52
- 238000007476 Maximum Likelihood Methods 0.000 claims abstract description 20
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- 239000011159 matrix material Substances 0.000 claims description 24
- 230000014509 gene expression Effects 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 238000005562 fading Methods 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 239000013598 vector Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 11
- 230000002708 enhancing effect Effects 0.000 abstract description 4
- 230000008054 signal transmission Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 206010042135 Stomatitis necrotising Diseases 0.000 description 6
- 201000008585 noma Diseases 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009365 direct transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/145—Passive relay systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a multiple access transmission method and device based on a reconfigurable intelligent surface, and belongs to the technical field of modulation. The invention constructs a space reflection mode according to the channel state information quality of each user and the number of accessed users, constructs channel link modeling, and restores the respective original bit information by using the continuous sequence detection technology of maximum likelihood detection and designed minimum mean square error through the received signals and the channel state information acquired by a plurality of users. The reconfigurable intelligent surface can be used for enhancing the signal transmission reliability of the weak user, accessing other users to transmit more additional data bits through dividing the reflection mode without any additional radio frequency link, and compared with the traditional multiple access method, the method provided by the invention has better error rate performance and lower detection calculation complexity.
Description
Technical Field
The invention belongs to the technical field of modulation, and particularly relates to a multiple access transmission method and device based on a reconfigurable intelligent surface.
Background
With the explosive growth of wireless data demands and the ever-scarce spectrum resources, the design of sixth generation (6G) mobile wireless communication networks is facing tremendous challenges. Compared with 5G, 6G fully integrates technologies in multiple fields such as machine ubiquitous access, intelligent perception, intelligent Internet of things platform and the like, so as to construct an unconnected and unknown immersive intelligent interconnection world. Then, due to limited spectrum resources and increased access to users, this will inevitably present resource contention and signal interference problems, resulting in a low transmission efficiency. Meanwhile, the large-scale on-line equipment can form an ultra-high energy consumption network. Therefore, revolutionary techniques are urgently needed to provide a solution for 6G.
In recent years, research on reconfigurable intelligent surfaces and application thereof in mobile communication has been raised, and the reconfigurable intelligent surface assisted multiple access is considered as a very promising technology, and the technology is mainly focused on a reconfigurable intelligent surface assisted NOMA framework at present, but uses the inherent reflection advantage of the reconfigurable intelligent surface to improve the system coverage, and cannot solve many challenges in the future 6G, and a novel multiple access technology based on the self space resource design of the reconfigurable intelligent surface is still blank. Although research on the development of RIS fusion multiple access technology exists, the design flow of the traditional NOMA is completely followed, and the problems of high computational complexity, mutual interference and the like brought to each user by a large number of reconfigurable intelligent surfaces under multiple users are ignored. At the same time, the exponentially increasing computational complexity also introduces additional overhead and significant problems to the system design.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a multiple access transmission method and a multiple access transmission device based on a reconfigurable intelligent surface, wherein a space reflection mode is constructed according to the channel state information quality of each accessed user and the number of accessed users, and the reconfigurable intelligent surface can be accessed to other users to transmit more extra data bits through dividing the reflection mode without any extra radio frequency link while enhancing the signal transmission reliability of weak users. The technical scheme adopted by the application is as follows:
a multiple access transmission method based on a reconfigurable intelligent surface, the method comprising:
constructing channel link modeling among a transmitting end, a reconfigurable intelligent surface and a user receiving end; according to the intensity distribution constellation symbols of the channel link and the space reflection mode of the reconfigurable intelligent surface, accessing a plurality of users, and grouping user information bit streams input under each time slot;
receiving signals and channel state information of different users are obtained through a user receiving end, and original bit information of each user is restored by maximum likelihood detection according to the receiving signals; and detecting and restoring the original bit of each user according to the continuous sequence of the minimum mean square error.
Further, the reconfigurable intelligent surface comprisesA plurality of reflecting elements which are equally divided intoEach spatial domain comprising +.>The method comprises the steps of carrying out a first treatment on the surface of the Dividing each of said spatial domains into +.>Groups, each group consisting ofThe adjacent reflective elements are formed to share the same phase adjustment;
the spatial reflection mode is selected fromSelecting at least->The reflective elements of the group perform the same phase transmission, the remainder +.>The reflective elements of a group are phase rotated +.>Orthogonal transmission, spatial reflection mode->From the following componentsPersonal space domain->Composition, each spatial domain->There is->A set of reflective segments, each reflective segment can be expressed as:
；
wherein,representing the%>Group reflection partition->Representing a set of reflection interval indices for in-phase transmission, < >>Representing a set of reflection interval indices for orthogonal transmission, < >>Represents a phase rotation of the incoming signal>Orthogonal transmission is performed>Representing the number of partition groups per spatial domain partition.
Further, constructing channel link modeling among the transmitting end, the reconfigurable intelligent surface and the user receiving end includes:
channel matrix between the transmitting end and the reconfigurable intelligent surfaceChannel matrix between the reconfigurable intelligent surface and the user side>Are modeled as Rayleigh fading channels, channel matrix +.>And->Is followed by a complex Gaussian distribution with a mean of 0 and a variance of 1, wherein +.>Indicate->Index of individual users.
Further, the accessing a plurality of users includes:
the transmitting end obtains the channel matrix through the feedback linkThe channel state information of each user is sequenced, and a channel matrix with the minimum channel gain is selected, wherein the expression is as follows:
；
wherein,the +.f. indicating minimum channel gain>Individual user (s)/(S)>Representing a valued function that minimizes the whole,/->Representing the Frobenius norm operation;
assigning constellation symbols to the firstIndividual users for information transmission, the remainder->The individual users transmit information via a spatial reflection mode.
Further, grouping the user information bit stream input in each time slot includes:
grouping the input bit stream of the transmitting end at each time slot, wherein the input bit stream of the transmitting end isA group; wherein weak user bits with low channel gain are divided into +.>Bit->，/>Modulation order representing phase shift modulation or quadrature amplitude modulation,/->Represents a base 2 logarithmic operation; bits of the remaining users areDivided into->Bit->，/>Representing a rounding down, a +.>Representing from->Selecting +.>All combined numbers of groups; the maximum information bit number transmitted by the transmitting end under each time slot is。
Further, the user receiving end obtains the receiving signals and channel state information of different users, and the formula for obtaining the receiving signals is as follows:
；
wherein,indicate->Signals received by the individual users, < >>；/>Representing from the reconfigurable intelligent surface to +.>Channel links between individual users->Constellation symbols representing weak user information with low channel gain +.>Representing from the reconfigurable intelligent surface to +.>Additive white gaussian noise vectors between individual users.
Further, the receiving signal restores original bit information of each user by using maximum likelihood detection, including:
converting the decimal index into corresponding binary bit information by using a maximum likelihood detection method, and restoring the transmitted initial binary bit by using the maximum likelihood detection method;
each user detection calculation expression is:
；
wherein,representing all constellation symbol sets,/>Representing all possible sets of spatial reflection modes, +.>Representing constellation symbols detected by maximum likelihood detection method,/or->Representing the spatial reflection pattern detected by the maximum likelihood detection method.
Further, detecting and restoring the original bit of each user according to the continuous sequence of the minimum mean square error comprises the following steps:
calculating the nearest constellation symbol under each space reflection mode by using a least mean square error formula, the firstThe individual user detection expressions are:
；
wherein,is expressed in spatial reflection mode->The next detected nearest constellation symbol, +.>Representing the conjugate operation of the matrix,/->Representing noise variance->Representing an identity matrix>Representing performing inverse operation on the matrix;
to be used forCalculating all constellation symbols and +.>The Euclidean distance between the two is expressed as follows:
；
wherein,representation of elementsSorting from small to large and returning the index value of the sorted element, < >>Representing an index set comprising +.>Index values;
after the index set is acquired, the front part is selectedThe index values are subjected to continuous sequence detection, and the expression is as follows:
；
wherein,expressed in the collection->Constellation symbol index of->Expressed in given parameters->Afterwards, from the collection->New set selected from->Representing a given parameter +.>Afterwards, from the collection->A new set selected from the group; />Representation byConstellation symbols detected by a continuous sequence detection method of minimum mean square error, < >>Representing the spatial reflection pattern detected by the continuous sequence detection method of minimum mean square error.
A reconfigurable intelligent surface-based multiple access transmission apparatus, comprising: the system comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the multiple access transmission method when executing the computer program.
A computer-readable storage medium storing a computer-executable program for causing a computer to execute the above-described multiple access transmission method.
Through the embodiment of the application, the following technical effects can be obtained:
(1) Unlike the existing end-to-end communication with the aid of the reconfigurable intelligent surface, the multiple access transmission method based on the reconfigurable intelligent surface can incorporate more users to communicate simultaneously, and improves the throughput of the system without adding additional radio frequency links;
(2) The multiple access transmission method based on the reconfigurable intelligent surface combines channel state information and fully utilizes the space resource advantage of the reconfigurable intelligent surface, improves the reliability of user information transmission, and simultaneously improves the performance degradation caused by the interference between signals.
(3) Continuous sequence detection with minimum mean square error is designed for the proposed multiple access technology, and the detection complexity of users is reduced while the transmission reliability of the system is maintained.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of an application scenario of a multiple access transmission method;
FIG. 2 is a schematic diagram showing the comparison of the bit error rate performance of the method of the present application with the prior art;
FIG. 3 is a schematic diagram showing the error rate performance of the subsequent sequence detection method;
fig. 4 is a schematic diagram of the composition structure of a multiple access transmission device.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be understood that in the description of the embodiments of the present application, the meaning of a plurality (or multiple) is two or more, and that greater than, less than, exceeding, etc. is understood to not include the present number, and that greater than, less than, within, etc. is understood to include the present number. If any, the terms "first," "second," etc. are used for distinguishing between technical features only, and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Aiming at the problems that the existing exponentially-increased calculation complexity brings additional cost and huge problems to system design, the embodiment of the application provides a multiple access transmission method and device based on a reconfigurable intelligent surface, which constructs a channel link modeling by constructing a space reflection mode according to the channel state information quality of each user and the number of access users, and restores respective original bit information by using a continuous sequence detection technology of maximum likelihood detection and designed minimum mean square error respectively through receiving signals and channel state information acquired by a plurality of users. The reconfigurable intelligent surface can be used for enhancing the signal transmission reliability of the weak user, and accessing other users to transmit more additional data bits through dividing the reflection mode without any additional radio frequency link.
Fig. 1 is a schematic diagram of an application scenario of a multiple access transmission method. The application scene model comprises a transmitting end with a single antenna and a receiving end with a single antennaReconfigurable smart surface of individual reflective element, receiving end with +.>Individual users, for the convenience of presentation in fig. 1, are +.>As an example. Since there is an obstacle between the transmitting end and the receiving end users and no direct transmission path, a reconfigurable intelligent surface is deployed to assist in the transmission of information. Wherein (1)>Representing the channel link from the transmitting end to the reconfigurable intelligent surface>、/>、/>Respectively representing the reconfigurable intelligenceChannel links between surface to users U1, U2, U3. The reconfigurable intelligent surface is divided into 2 spatial domains for transmitting information of user U2 and user U3. The multiple access transmission method comprises the following steps:
a reconfigurable intelligent surface is deployed between a transmitting end and a plurality of users, and the reconfigurable intelligent surface is connected with the transmitting end through a controller to construct a space reflection mode of the reconfigurable intelligent surface; constructing channel link modeling among the transmitting end, the reconfigurable intelligent surface and the user receiving end; according to the intensity of the channel link, constellation symbols and a space reflection mode of the reconfigurable intelligent surface are distributed, and a plurality of users are accessed;
grouping user information bit streams input under each time slot; receiving signals and channel state information of different users are obtained through a user receiving end; restoring original bit information of each user by using maximum likelihood detection according to the received signals; and detecting and restoring the original bit of each user according to the continuous sequence of the minimum mean square error.
And a reconfigurable intelligent surface is deployed between the transmitting end and a plurality of users, the reconfigurable intelligent surface is connected with the transmitting end through a controller, a space reflection mode of the reconfigurable intelligent surface is constructed, the transmitting end comprises a single transmitting antenna, the receiving end is provided with n mutually independent users, and each user comprises a single receiving antenna.
Deploying information transmission of auxiliary information of a reconfigurable intelligent surface from a transmitting end to a user end, wherein the reconfigurable intelligent surface comprisesA plurality of reflecting elements for equally dividing the reflecting unit into +.>Each spatial domain comprises。
Dividing each of the spatial domains intoGroups, each group is composed of->The adjacent reflective elements are composed to share the same phase adjustment, the spatial reflection pattern is from +.>Selecting at least->The reflective elements of the group perform the same phase transmission, the remainder +.>The reflective elements of a group are phase rotated +.>Orthogonal transmission, spatial reflection mode->From the following componentsPersonal space domain->Composition, each spatial domain->There is->A set of reflective segments, each reflective segment can be expressed as:
；
wherein,representing the%>Group reflection partition->Representing a set of reflection interval indices for in-phase transmission, < >>Representing a set of reflection interval indices for orthogonal transmission, < >>Represents a phase rotation of the incoming signal>Orthogonal transmission is performed>Representing the number of partition groups per spatial domain partition.
Constructing channel link modeling between the transmitting end, the reconfigurable intelligent surface and the user receiving end, wherein a channel matrix between the transmitting end and the reconfigurable intelligent surface can be expressed asThe channel matrix between the reconfigurable intelligent surface and the user terminal can be expressed as +.>Wherein->Indicate->Index of individual users. Since reconfigurable smart surfaces are usually fixed in a high position and in a rich scattering environment, therefore +.>And->，Modeled as a rayleigh fading channel, each element in its matrix follows a complex gaussian distribution with a mean of 0 and a variance of 1.
According to the intensity distribution constellation symbols of the channel link and the space reflection mode of the reconfigurable intelligent surface, a plurality of users are accessed, and a transmitting end acquires the channel matrix through a feedback linkChannel state information of (a) is provided. The channel gains of all users are ordered, and a channel matrix with the minimum channel gain is selected, wherein the expression is as follows:
；
wherein,the +.f. indicating minimum channel gain>Individual user (s)/(S)>Representing a valued function that minimizes the whole,/->Representing the Frobenius norm operation. In order to improve the reliability and fairness of all user transmissions, constellation symbols are assigned to the +.>Individual users for information transmission, the remainder->The individual users transmit information via a spatial reflection mode.
Grouping user information bit streams input under each time slot, and inputting the transmitting end under each time slotGrouping bit streams, wherein the bit streams of the transmitting end are as followsA group. Wherein weak user bits with low channel gain are divided into +.>Bit->，/>Modulation order representing phase shift modulation or quadrature amplitude modulation,/->A base 2 logarithmic operation is shown. The bits of the remaining users are divided into +>Bit->，/>Representing a rounding down, a +.>Representing from->Selecting +.>All combinations of groups. The maximum number of information bits transmitted by the transmitting terminal per time slot is +.>。
The method comprises the steps of obtaining receiving signals and channel state information of different users through a user receiving end, and obtaining the receiving signals through the user end comprises the following steps:
；
wherein,indicate->Signals received by the individual users, < >>。/>Representing from the reconfigurable intelligent surface to +.>Channel links between individual users->Constellation symbols representing weak user information with low channel gain +.>Representing from the reconfigurable intelligent surface to +.>Additive white gaussian noise vectors between individual users.
The received signal restores the original bit information of each user, the decimal index is converted into corresponding binary bit information by using a maximum likelihood detection method, and the transmitted initial binary bit is restored by using the maximum likelihood detection method. Each user detection calculation expression is:
；
wherein,representing all constellation symbol sets,/>Representing all possible sets of spatial reflection modes, +.>Representing constellation symbols detected by maximum likelihood detection method,/or->Representing the spatial reflection pattern detected by the maximum likelihood detection method. Thus, a weak user with low channel gain can be obtained by traversing +.>The decimal index in the constellation symbol set restores the own information bits, the rest +.>Individual users can be represented by traversing->The decimal index in the set of spatial reflection modes restores its own information bits.
The original bit of each user is detected and restored by using a continuous sequence of the minimum mean square error, the nearest constellation symbol under each space reflection mode is calculated by using a minimum mean square error formula, and the method is thatThe individual user detection expressions are:
；
wherein,is expressed in spatial reflection mode->Lower detection ofIs the most similar constellation symbol, ">Representing the conjugate operation of the matrix,/->Representing noise variance->Representing an identity matrix>Representing an inverse operation on the matrix. Then, byCalculating all constellation symbols and +.>The Euclidean distance between the two is expressed as follows:
；
wherein,index value representing elements after sorting from small to large and returning the sorted elements +.>Representing an index set comprising +.>And index values. After the index set is acquired, the front +.>The index values are subjected to continuous sequence detection, and the expression is as follows:
；
wherein,expressed in the collection->Constellation symbol index of->Expressed in given parameters->Afterwards, from the collection->New set selected from->Representing a given parameter +.>Afterwards, from the collection->A new set selected from the group. />Representing constellation symbols detected by a continuous sequence detection method of minimum mean square error, < >>Representing the spatial reflection pattern detected by the continuous sequence detection method of minimum mean square error. Thus, a weak user with low channel gain can be obtained by traversing +.>The decimal index in the constellation symbol set restores the own information bits, the rest +.>Individual users can be represented by traversing->The decimal index in the set of spatial reflection modes restores its own information bits.
Fig. 2 is a schematic diagram comparing the bit error rate performance of the method of the present application with that of the prior art. To demonstrate the superiority of the proposed RIS-RPMA scheme, the simulation results of FIG. 2 are used to evaluate the bit error rate performance of the multiple access technique. And comparing the bit error rate performance of the RIS-RPMA with that of the RIS-NOMA under different parameters. For the purpose of fair comparison, the transmitting end has only one transmitting antenna, and the number of users at the receiving endIn order to fairly compare the parameters of power allocation in RIS-NOMA to 0.7, 0.245 and 0.05, respectively, each user adopts QPSK modulation symbol, and the maximum transmission bit number per time slot is +.>The method comprises the steps of carrying out a first treatment on the surface of the In RIS-RPMA +.>With QPSK modulation, U1 and U2 carry information bits with spatial-domain reflection mode, each in the user space domain、/>Thus, the maximum number of transmission bits of RIS-RPMA per slot +.>. In RIS element number->And->When the bit error rate falls to +.>When compared with RIS-NOMA, RIS-RPMA can respectivelyBit error rate performance gains of 4dB and 3.5dB are obtained. The main reason is that the imperfect power distribution in RIS-NOMA makes partial users only get a small part and the interference between users caused by superposition coding reduces the system performance, while the RIS-RPMA technology avoids the power distribution and fully utilizes the space domain resource of the reconfigurable intelligent surface, and improves the transmission reliability of the system while accessing more users.
Fig. 3 is a schematic diagram of bit error rate performance of the subsequent sequence detection method. The figure shows the bit error rate performance of the proposed low complexity MMSE-SD detection method for the RIS-RPMA scheme compared with the optimal maximum likelihood detector (ML), respectively. The experimental result is based on the number of bits transmitted by the system in each time slot, and the proposed MMSE-SD detection is a special case of ML detection, and as a given parameter decreases, the lower the detection complexity, the worse the performance. It is worth noting, however, that the proposed MMSE-SD detection still maintains very close performance to the optimal ML detection at that time, but its computational complexity is only 50% of that of ML detection.
As shown in fig. 4, the embodiment of the application further provides a multiple access transmission device. In an exemplary embodiment, the multiple access transmission apparatus includes: one or more processors and memory, one processor and memory being illustrated in fig. 4. The processor and the memory may be connected by a bus or otherwise, for example in fig. 4.
The memory is used as a non-transitory computer readable storage medium for storing a non-transitory software program and a non-transitory computer executable program, such as the network data processing method in the embodiments of the present application. The processor implements the multiple access transmission method in the embodiments of the present application described above by running a non-transitory software program stored in a memory and the program.
The memory may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; the storage data area may store data and the like required to perform the network data processing method in the embodiment of the present application described above. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory may include memory remotely located with respect to the processor, which may be connected to the network data processing device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Further, the embodiment of the present application provides a computer-readable storage medium storing a computer-executable program, where the computer-executable program is executed by one or more control processors, for example, by one processor, and the one or more processors may be caused to perform the multiple access transmission method in the embodiment of the present application.
In summary, the present application provides a multiple access transmission method based on a reconfigurable intelligent surface. In the scheme, the advantages of improving the coverage and enhancing the communication quality of users of the traditional reconfigurable intelligent surface are reserved, meanwhile, the capacity of an access user is increased by utilizing the inherent spatial domain resource of the reconfigurable intelligent surface, and the channel capacity of the whole system is improved, so that the problems of signal interference, ultra-high power consumption and the like caused by multiple users are reduced. Continuous sequence detection with minimum mean square error is also designed for the proposed transmission method to reduce the detection complexity of the transmission method. Compared with the traditional multiple access method, the method provided by the invention has better error rate performance and lower detection complexity.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable programs, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable programs, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
While the embodiments of the present application have been described in detail, the present application is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit and scope of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (10)
1. A multiple access transmission method based on a reconfigurable intelligent surface, the method comprising:
constructing channel link modeling among a transmitting end, a reconfigurable intelligent surface and a user receiving end; according to the intensity distribution constellation symbols of the channel link and the space reflection mode of the reconfigurable intelligent surface, accessing a plurality of users, and grouping user information bit streams input under each time slot;
receiving signals and channel state information of different users are obtained through a user receiving end, and original bit information of each user is restored by maximum likelihood detection according to the receiving signals; and detecting and restoring the original bit of each user according to the continuous sequence of the minimum mean square error.
2. The method of claim 1, wherein the reconfigurable intelligent surface comprisesA plurality of reflecting elements, the reflecting elements are equally divided into +.>Each spatial domain comprising +.>The method comprises the steps of carrying out a first treatment on the surface of the Dividing each of said spatial domains into +.>Groups, each group is composed of->The adjacent reflective elements are formed to share the same phase adjustment;
the spatial reflection mode is selected fromSelecting at least->The reflecting elements of a group transmitting the same phase, the remainderThe reflective elements of a group are phase rotated +.>Orthogonal transmission, spatial reflection mode->By->Personal spaceDomain->Composition, each spatial domain->There is->A set of reflective segments, each reflective segment can be expressed as:
；
wherein,representing the%>Group reflection partition->Representing a set of reflection interval indices for in-phase transmission,representing a set of reflection interval indices for orthogonal transmission, < >>Represents a phase rotation of the incoming signal>Orthogonal transmission is performed>Representing the number of partition groups per spatial domain partition.
3. The method of claim 1, wherein constructing channel link modeling between the transmitting end, the reconfigurable intelligent surface, and the user receiving end comprises:
channel matrix between the transmitting end and the reconfigurable intelligent surfaceChannel matrix between the reconfigurable intelligent surface and the user side>Are modeled as Rayleigh fading channels, channel matrix +.>And->Is followed by a complex Gaussian distribution with a mean of 0 and a variance of 1, wherein +.>Indicate->Index of individual users.
4. The method of claim 1, wherein the accessing a plurality of users comprises:
the transmitting end obtains the channel matrix through the feedback linkThe channel state information of each user is sequenced, and a channel matrix with the minimum channel gain is selected, wherein the expression is as follows:
；
wherein,the +.f. indicating minimum channel gain>Individual user (s)/(S)>Representing a valued function that minimizes the whole,/->Representing the Frobenius norm operation;
assigning constellation symbols to the firstIndividual users for information transmission, the remainder->The individual users transmit information via a spatial reflection mode.
5. The method of claim 1, wherein grouping the user information bit stream input per slot comprises:
grouping the input bit stream of the transmitting end at each time slot, wherein the input bit stream of the transmitting end isA group; wherein weak user bits with low channel gain are divided into +.>Bit->，/>Modulation order representing phase shift modulation or quadrature amplitude modulation,/->Represents a base 2 logarithmic operation; the bits of the remaining users are divided intoBit->，/>Representing a rounding down, a +.>Representing from->Selecting +.>All combined numbers of groups; the maximum number of information bits transmitted by the transmitting terminal per time slot is +.>。
6. The method of claim 1, wherein the receiving signals and channel state information of different users are obtained by a user receiving end, and a formula for obtaining the receiving signals is as follows:
；
wherein,indicate->Signals received by the individual users, < >>；/>Representing from the reconfigurable intelligent surface to +.>Channel links between individual users->Constellation symbols representing weak user information with low channel gain +.>Representing from the reconfigurable intelligent surface to +.>Additive white gaussian noise vectors between individual users.
7. The method of claim 1, wherein the received signal restores original bit information for each user using maximum likelihood detection, comprising:
converting the decimal index into corresponding binary bit information by using a maximum likelihood detection method, and restoring the transmitted initial binary bit by using the maximum likelihood detection method;
each user detection calculation expression is:
；
wherein,representing all constellation symbol sets,/>Representing all possible sets of spatial reflection modes, +.>Representing constellation symbols detected by maximum likelihood detection method,/or->Representing the spatial reflection pattern detected by the maximum likelihood detection method.
8. The method of claim 1, wherein the detecting the original bits of each user based on the continuous sequence of minimum mean square deviations comprises:
calculating the nearest constellation symbol under each space reflection mode by using a least mean square error formula, the firstThe individual user detection expressions are:
；
wherein,is expressed in spatial reflection mode->The next detected nearest constellation symbol, +.>Representing the conjugate operation of the matrix,/->Representing noise variance->Representing an identity matrix>Representing performing inverse operation on the matrix;
to be used forCalculating all constellation symbols and +.>The Euclidean distance between the two is expressed as follows:
；
wherein,index value representing elements after sorting from small to large and returning the sorted elements +.>Representing an index set comprising +.>Index values;
after the index set is acquired, the front part is selectedThe index values are subjected to continuous sequence detection, and the expression is as follows:
；
wherein,expressed in the collection->Constellation symbol index of->Expressed in given parameters->Afterwards, from the collection->New set selected from->Representing a given parameter +.>Afterwards, from the collection->A new set selected from the group; />Representing constellation symbols detected by a continuous sequence detection method of minimum mean square error, < >>Representing the spatial reflection pattern detected by the continuous sequence detection method of minimum mean square error.
9. A reconfigurable intelligent surface-based multiple access transmission apparatus, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the multiple access transmission method according to any one of claims 1 to 8 when the computer program is executed.
10. A computer-readable storage medium storing a computer-executable program for causing a computer to execute the multiple access transmission method according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410044172.2A CN117560048B (en) | 2024-01-12 | 2024-01-12 | Multiple access transmission method and device based on reconfigurable intelligent surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410044172.2A CN117560048B (en) | 2024-01-12 | 2024-01-12 | Multiple access transmission method and device based on reconfigurable intelligent surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117560048A true CN117560048A (en) | 2024-02-13 |
| CN117560048B CN117560048B (en) | 2024-04-05 |
Family
ID=89821870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410044172.2A Active CN117560048B (en) | 2024-01-12 | 2024-01-12 | Multiple access transmission method and device based on reconfigurable intelligent surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117560048B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020151380A1 (en) * | 2019-01-22 | 2020-07-30 | Boe Technology Group Co., Ltd. | A method for wireless data communication and a communication apparatus |
| CN113271597A (en) * | 2021-04-15 | 2021-08-17 | 广东工业大学 | Safety communication optimization method for reconfigurable intelligent surface assisted non-orthogonal multiple access |
| CN114172773A (en) * | 2020-09-10 | 2022-03-11 | 维沃移动通信有限公司 | Modulation method and apparatus, communication device, and readable storage medium |
| CN114785384A (en) * | 2022-04-14 | 2022-07-22 | 东南大学 | Capacity analysis and optimization method for intelligent super-surface auxiliary large-scale MIMO related channel |
| CN115102821A (en) * | 2022-06-21 | 2022-09-23 | 中国计量大学 | Generalized orthogonal reflection modulation method combined with intelligent reflection surface grouping planning mapping |
| CN115484607A (en) * | 2022-09-09 | 2022-12-16 | 南京工业大学 | RIS assisted SWIPT wireless system secure communication method |
| US20220416968A1 (en) * | 2021-06-29 | 2022-12-29 | Qualcomm Incorporated | Channel reporting for reconfigurable surfaces |
| US20230043800A1 (en) * | 2021-07-14 | 2023-02-09 | Nec Laboratories America, Inc. | SHAPING mmWAVE WIRELESS CHANNEL VIA MULTI-BEAM DESIGN USING RECONFIGURABLE INTELLIGENT SURFACES |
| CN116260502A (en) * | 2023-05-15 | 2023-06-13 | 浙江香农通信科技有限公司 | Double-domain index modulation communication method based on reconfigurable intelligent surface |
| CN116318311A (en) * | 2023-05-15 | 2023-06-23 | 浙江香农通信科技有限公司 | Transmission method based on reconfigurable intelligent surface anti-phase index modulation |
| CN116527176A (en) * | 2023-04-12 | 2023-08-01 | 重庆邮电大学 | Reconfigurable surface auxiliary index modulation method based on non-orthogonal multiple access |
| CN116760461A (en) * | 2023-04-24 | 2023-09-15 | 清华大学 | Wireless light downlink multiple access communication method based on optical intelligent reflecting surface |
-
2024
- 2024-01-12 CN CN202410044172.2A patent/CN117560048B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020151380A1 (en) * | 2019-01-22 | 2020-07-30 | Boe Technology Group Co., Ltd. | A method for wireless data communication and a communication apparatus |
| CN114172773A (en) * | 2020-09-10 | 2022-03-11 | 维沃移动通信有限公司 | Modulation method and apparatus, communication device, and readable storage medium |
| CN113271597A (en) * | 2021-04-15 | 2021-08-17 | 广东工业大学 | Safety communication optimization method for reconfigurable intelligent surface assisted non-orthogonal multiple access |
| US20220416968A1 (en) * | 2021-06-29 | 2022-12-29 | Qualcomm Incorporated | Channel reporting for reconfigurable surfaces |
| US20230043800A1 (en) * | 2021-07-14 | 2023-02-09 | Nec Laboratories America, Inc. | SHAPING mmWAVE WIRELESS CHANNEL VIA MULTI-BEAM DESIGN USING RECONFIGURABLE INTELLIGENT SURFACES |
| CN114785384A (en) * | 2022-04-14 | 2022-07-22 | 东南大学 | Capacity analysis and optimization method for intelligent super-surface auxiliary large-scale MIMO related channel |
| CN115102821A (en) * | 2022-06-21 | 2022-09-23 | 中国计量大学 | Generalized orthogonal reflection modulation method combined with intelligent reflection surface grouping planning mapping |
| CN115484607A (en) * | 2022-09-09 | 2022-12-16 | 南京工业大学 | RIS assisted SWIPT wireless system secure communication method |
| CN116527176A (en) * | 2023-04-12 | 2023-08-01 | 重庆邮电大学 | Reconfigurable surface auxiliary index modulation method based on non-orthogonal multiple access |
| CN116760461A (en) * | 2023-04-24 | 2023-09-15 | 清华大学 | Wireless light downlink multiple access communication method based on optical intelligent reflecting surface |
| CN116260502A (en) * | 2023-05-15 | 2023-06-13 | 浙江香农通信科技有限公司 | Double-domain index modulation communication method based on reconfigurable intelligent surface |
| CN116318311A (en) * | 2023-05-15 | 2023-06-23 | 浙江香农通信科技有限公司 | Transmission method based on reconfigurable intelligent surface anti-phase index modulation |
Non-Patent Citations (3)
| Title |
|---|
| WENJING YAN: "Frequency Reflection Modulation for Reconfigurable Intelligent Surface Aided OFDM Systems", IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 25 May 2022 (2022-05-25) * |
| 侯天为: "非正交多址接入的同步透射反射智能超表面信号增强算法", 北京邮电大学学报, 20 October 2023 (2023-10-20) * |
| 张丁才: "可重构智能表面辅助无线供电通信网络的吞吐量优化研究", CNKI中国优秀硕士学位论文, 15 January 2023 (2023-01-15) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117560048B (en) | 2024-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | A survey on deep learning techniques in wireless signal recognition | |
| Luo | Machine learning for future wireless communications | |
| US20210274361A1 (en) | Machine learning deployment in radio access networks | |
| Restuccia et al. | Deep learning at the physical layer: System challenges and applications to 5G and beyond | |
| CN106059970B (en) | Sparse coding multiple access access code book design method based on maximum capacity | |
| Hassan et al. | Key technologies for ultra-reliable and low-latency communication in 6G | |
| Camelo et al. | A semi-supervised learning approach towards automatic wireless technology recognition | |
| CN107204831B (en) | A kind of low complex degree detection method for MIMO-SCMA system | |
| Huang et al. | A novel cross layer anti-collision algorithm for slotted ALOHA-based UHF RFID systems | |
| Jing et al. | Project Articles | |
| Huang et al. | Parallel quadrature spatial modulation for massive MIMO systems with ICI avoidance | |
| CN117560048B (en) | Multiple access transmission method and device based on reconfigurable intelligent surface | |
| Xie et al. | Effective collaboration to maximize throughput based on multiuser cooperative mobility in social-physical ad hoc networks | |
| CN110191476B (en) | Reconfigurable antenna array-based non-orthogonal multiple access method | |
| Mu et al. | Semantic communications in multi-user wireless networks | |
| EP3697010A1 (en) | Data processing method and device | |
| JP3860796B2 (en) | Uplink data communication apparatus and method | |
| CN114640561A (en) | Communication signal transmission method and device | |
| CN107196741B (en) | A kind of detection method for MIMO-SCMA system | |
| KR20170125527A (en) | Symbol detection method in generalized spatial modulation multiple input multiple output system and receiver using thereof | |
| CN115037394B (en) | GSIC-based multiple RISs-assisted NOMA system design method | |
| CN114024804B (en) | Maximum likelihood detection method and system assisted by overlapping clustering | |
| Gautam et al. | and Networks | |
| Xiong et al. | Research on Low Complexity Differential Space Modulation Detection Algorithm | |
| Jia et al. | Design of Codebook for High Overload SCMA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |