CN115664485B - Control method, device, terminal and medium for discrete phase adjustable intelligent reflecting surface - Google Patents
Control method, device, terminal and medium for discrete phase adjustable intelligent reflecting surface Download PDFInfo
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Abstract
The invention discloses a control method, a device, a terminal and a medium of a discrete phase adjustable intelligent reflecting surface, wherein a plurality of reflecting blocks are obtained by dividing the discrete phase adjustable intelligent reflecting surface into blocks, each reflecting block comprises a plurality of reflecting units, and code words of each reflecting unit in each reflecting block and amplitude phase response pairs corresponding to each code word are obtained; traversing the states of all the reflection units of the reflection block according to the bit number of the reflection unit to combine to obtain a plurality of code word combinations of the reflection block; determining amplitude phase response of each codeword combination according to amplitude phase response corresponding to all codewords in the reflection block; constructing a codebook of the reflection block based on the codeword combination of the reflection block and the corresponding amplitude phase response thereof; and controlling the reflecting units in the reflecting block according to the codebook of the reflecting block. By the scheme, the complexity of effectively controlling the discrete phase adjustable intelligent reflecting surface can be reduced, and the power consumption and time delay of a communication system are reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a terminal, and a medium for controlling a discrete phase adjustable intelligent reflection surface.
Background
With the explosive growth of mobile data traffic demands, especially the explosion of the number of mobile connected devices and the advent of high data rate services, the demand for higher capacity in mobile communication systems is increasing and the spectrum resources are also becoming increasingly stringent. Millimeter wave (millimeter wave) is considered as one of key technologies of mobile communication technologies (such as 5G, 6G, etc.), and because of its abundant spectrum resources, the millimeter wave (millimeter wave) can effectively improve the system capacity and solve the problem of spectrum resource shortage. However, the high transmission loss characteristics of millimeter waves make the high-frequency band difficult to deploy in complex environments with many obstacles. The intelligent reflection surface (Intelligent Reflecting Surface, IRS) is composed of a large number of low-cost reflection units, and each reflection unit can independently adjust the phase and/or amplitude of an incident signal, so that the intelligent reconfiguration of a wireless propagation environment can be realized, the performance of a wireless communication network is remarkably improved, and the intelligent reflection surface is considered to be one of the most promising front technologies in the next-generation mobile communication technology.
Most IRS-assisted communication systems are currently studied assuming that the phase of the reflective element of the IRS is continuously, arbitrarily variable. However, in the practical design of IRS, the phase slave of the reflecting unit is realized in a wide frequency rangeTo the point ofContinuous bias or other external conditions are required to drive devices such as varactors, graphene and ferroelectric thin films, which not only requires more complex, higher precision control circuitry, but also results in increased production costs, both technically and implementation challenging. Therefore, in practical application, the adjustable phase and/or amplitude of the intelligent reflecting surface is generally realized by adopting a discrete phase adjustable mode, namely, a discrete value with limited precision (such as 2-bit quantization, only 4 phases are adjustable) is adopted, instead of any adjustable continuous value, and the discrete phase adjustable mode is realized by adopting a low-cost switch diode only, so that the cost is low and the realization is simple.
In practical applications, in order to better adapt to a changeable wireless communication environment, the controller of the intelligent reflecting surface adjusts the reflecting matrix of the reflecting surface according to the change of the channel state. The discrete phase adjustable intelligent reflecting surface consists of a large number of reflecting units, along with the increase of the number of the reflecting units and the number of discrete phase bits, the time required by channel estimation is increased, and a large amount of calculation cost is required to be consumed, so that the control complexity of the reflecting units is high, the discrete phase adjustable intelligent reflecting surface cannot be effectively controlled in real time, and a communication system based on the discrete phase adjustable intelligent reflecting surface has larger time delay.
Based on this, how to provide a technical solution for reducing the computation cost, time delay and control complexity of the reflection unit for the intelligent reflection surface with adjustable discrete phase becomes a technical problem to be solved.
Disclosure of Invention
The invention mainly aims to provide a control method, a device, a terminal and a computer readable storage medium of a discrete phase adjustable intelligent reflecting surface, and aims to solve the technical problems that the control complexity of the discrete phase adjustable intelligent reflecting surface is high, the discrete phase adjustable intelligent reflecting surface cannot be effectively controlled in real time, and the time delay of a corresponding communication system is long in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling a discrete phase-adjustable intelligent reflection surface, the method including:
acquiring code words of reflection units in a reflection block of the discrete phase adjustable intelligent reflection surface, and determining amplitude phase response pairs corresponding to each code word; wherein the discrete phase adjustable intelligent reflective surface comprises a plurality of reflective blocks, each reflective block comprising a plurality of reflective units; the amplitude phase response pair includes: amplitude response and phase response;
Traversing the states of all the reflecting units in the reflecting block according to the bit number of the reflecting unit, and combining the code words of all the reflecting units in the reflecting block to obtain a plurality of code word combinations of the reflecting block;
determining amplitude phase response pairs of the code word combinations according to the amplitude phase response pairs corresponding to each code word in the reflection blocks;
constructing a codebook of each reflection block based on the codeword combinations of the reflection blocks and amplitude phase response pairs of the codeword combinations;
controlling the reflection units in the reflection blocks based on the codebook of each reflection block according to the discrete phase adjustable intelligent reflection surface.
Optionally, the controlling the reflection unit in the reflection block based on the codebook of each reflection block according to the discrete phase adjustable intelligent reflection surface specifically includes:
acquiring a continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable intelligent reflection surface; the optimal value of the continuous phase reflection matrix is a continuous phase reflection matrix corresponding to the maximum value of the channel capacity of the communication system based on the discrete phase adjustable intelligent reflection surface;
Determining the phase response closest to the optimal value of the continuous phase reflection matrix in the codebook according to the codebook of each reflection block and the corresponding optimal value of the continuous phase reflection matrix, and taking the phase response as the target phase response of the reflection block;
controlling the reflection units in the reflection blocks based on target phase responses of the reflection blocks and target amplitude responses corresponding to the target phase responses.
Optionally, the controlling the reflection unit in the reflection block based on the target phase response of each reflection block and the target phase response specifically includes:
determining a codeword corresponding to the target phase response of each reflection block as a target code;
controlling a reflection unit in the reflection block according to the target code of the block and the amplitude phase response corresponding to the target code;
wherein, the amplitude phase response pair corresponding to the target code comprises: the target phase response and the target amplitude response.
Optionally, the constructing a codebook of each reflection block based on the codeword combinations of each reflection block and amplitude-phase response pairs of the codeword combinations specifically includes:
Distributing the phase response corresponding to each code word combination to a corresponding temporary set according to the phase value of the phase response corresponding to each code word combination in the reflection block; the phase value ranges of the temporary sets are different from each other;
determining the phase response closest to the corresponding preset phase response value in each temporary set;
the code word combination corresponding to the phase response closest to the corresponding preset phase response value in each temporary set is used as an optimal code word combination;
and constructing a codebook of the corresponding reflection block according to each optimal codeword combination and the amplitude phase response corresponding to the optimal codeword combination.
Optionally, before assigning the phase response corresponding to each codeword combination to the temporary set of responses according to the phase value of the phase response corresponding to each codeword combination in the reflection block, the method further includes:
determining whether the amplitude response of each codeword combination in the reflection block is less than a preset amplitude response threshold;
and deleting the code word combination smaller than the preset amplitude response threshold value.
Optionally, before assigning the phase response corresponding to each codeword combination to the corresponding temporary set according to the phase value of the phase response corresponding to each codeword combination in the reflection block, the method further includes:
According to the preset codebook lengthLSetting upL-the temporary sets;
dividing the phase into equal proportionsLThe phase value ranges and the phase values are calculatedLAnd the phase value ranges are allocated to the corresponding temporary sets.
Optionally, determining an amplitude phase response pair of each codeword combination according to an amplitude phase response pair corresponding to each codeword in the reflection block specifically includes:
acquiring position information of a block center point of the reflection block and position information of each reflection unit in the reflection block;
determining a phase difference of each of the reflection units in the reflection block based on position information of the block center point of the reflection block, position information of each of the reflection units in the reflection block;
and determining amplitude phase response pairs of the code word combinations according to the amplitude phase response pairs corresponding to all the code words in the reflection block and the phase difference of each reflection unit.
Optionally, each of the reflecting units is a t-bit, wherein,tgreater than or equal to 1.
Optionally, the obtaining the continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable intelligent reflection surface specifically includes:
Acquiring a channel state of a communication system based on the discrete phase adjustable intelligent reflecting surface, the number of antennas of a signal transmitting antenna and a signal receiving antenna, and the number of blocks of the reflecting block of the discrete phase adjustable intelligent reflecting surface; wherein the channel state at least includes: transmitting end-intelligent reflecting surface link channel state, intelligent reflecting surface-receiving end link channel state and transmitting end-receiving end link channel state;
and determining the optimal value of the continuous phase reflection matrix of each reflection block in the discrete phase adjustable intelligent reflection surface according to the channel state, the number of the signal transmitting antennas and the signal receiving antennas and the number of the reflection blocks of the discrete phase adjustable intelligent reflection surface.
Optionally, after determining the continuous phase reflection matrix optimal value corresponding to the discrete phase tunable intelligent reflection surface, the method further includes: based on the discrete phase adjustable intelligent reflecting surface reflection matrix, optimizing a transmitting end covariance matrix of the communication system by using a water injection algorithm, and feeding back the optimized transmitting end covariance matrix to a transmitting end of the communication system for power regulation of a multi-transmitting antenna.
In order to achieve the above object, an embodiment of the present invention provides a control device for a discrete phase-adjustable intelligent reflection surface, the device including:
the first determining unit is used for obtaining the code word of each reflecting unit in the reflecting block of the discrete phase adjustable intelligent reflecting surface and determining an amplitude phase response corresponding to each code word; wherein the discrete phase adjustable intelligent reflective surface comprises a plurality of reflective blocks, each reflective block comprising a plurality of reflective units; the amplitude phase response pair includes: amplitude response and phase response;
a combination unit, configured to traverse states of all the reflection units in the transmission block according to the number of bits of the reflection unit, and combine codewords of all the reflection units in the reflection block to obtain codeword combinations of each reflection block;
a second determining unit, configured to determine an amplitude phase response pair of each codeword combination according to an amplitude phase response pair corresponding to each codeword in each reflection block;
a codebook unit, configured to construct a codebook of each reflection block based on the codeword combinations of each reflection block and amplitude-phase response pairs of the codeword combinations;
And the control unit is used for controlling the reflecting units in the reflecting blocks based on the codebook of each reflecting block of the intelligent reflecting surface with the adjustable discrete phase.
Optionally, the control unit is specifically configured to:
acquiring an optimal value of a continuous phase reflection matrix corresponding to the intelligent reflection surface; the optimal value of the continuous phase reflection matrix is a continuous phase reflection matrix corresponding to the maximum value of the channel capacity of the communication system based on the discrete phase adjustable intelligent reflection surface;
determining the phase response closest to the optimal value of the continuous phase reflection matrix in the codebook according to the codebook of each reflection block and the corresponding optimal value of the continuous phase reflection matrix, and taking the phase response as the target phase response of the reflection block;
controlling the reflection units in the reflection blocks based on target phase responses of the reflection blocks and target amplitude responses corresponding to the target phase responses.
In order to achieve the above object, an embodiment of the present invention further provides a terminal, including: a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the processor, when executing the computer readable program, implements the steps in the discrete phase adjustable intelligent reflector control method as described in any one of the above.
To achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores one or more programs, and the one or more programs are executable by one or more processors to implement the steps in the discrete phase adjustable intelligent reflection surface control method according to any one of the above.
The method comprises the steps of dividing a discrete phase-adjustable intelligent reflecting surface into a plurality of reflecting blocks, wherein each reflecting block comprises a plurality of reflecting units, then obtaining code words of each reflecting unit in the reflecting block, determining amplitude phase response corresponding to each code word, traversing states of all reflecting units in a transmitting block according to bit numbers of the reflecting units, combining the code words of all reflecting units in the reflecting block, determining a plurality of code word combinations of the reflecting block, determining amplitude phase response corresponding to each code word in the reflecting block, and constructing a codebook of the reflecting block based on the code word combinations and the amplitude phase response of the code word combinations of the reflecting block so as to control the reflecting units in the reflecting block through the codebook of the reflecting block. The invention controls the discrete adjustable phase reflecting units through the codebook of each reflecting block, can greatly reduce the complexity of controlling the reflecting units and reduce the calculation cost of channel estimation, thereby effectively controlling the discrete phase adjustable intelligent reflecting surface in real time, reducing the time delay of a communication system based on the discrete phase adjustable intelligent reflecting surface and improving the communication efficiency.
Drawings
FIG. 1 is a flow chart of a control method of a discrete phase adjustable intelligent reflecting surface provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a discrete phase-tunable intelligent reflective surface according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a reflective block according to an embodiment of the present invention;
fig. 4 is a flowchart of step S104 provided in the embodiment of the present invention;
FIG. 5 is a flowchart of a method for constructing a codebook of reflection blocks according to an embodiment of the present invention;
fig. 6 is a flowchart of step S105 provided in an embodiment of the present invention;
FIG. 7 is an application scenario diagram of a discrete phase-adjustable intelligent reflective surface provided by an embodiment of the present invention;
FIG. 8 is another flow chart of a method for controlling a discrete phase adjustable intelligent reflective surface according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a control device for a discrete phase-adjustable intelligent reflecting surface according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a control method of a discrete phase adjustable intelligent reflecting surface according to an embodiment of the present invention, as shown in fig. 1, where the control method provided by the embodiment of the present invention at least may include the following steps:
s101, acquiring a code word of each reflection unit in a reflection block of the discrete phase adjustable intelligent reflection surface, and determining an amplitude phase response pair corresponding to each code word.
In the embodiment of the invention, the discrete phase adjustable intelligent reflecting surface can be divided into a plurality of reflecting blocks, namely the discrete phase adjustable reflecting surface comprises a plurality of reflecting blocks, and each reflecting block comprises a plurality of reflecting units. As shown in figures 2 and 3 of the drawings,the reflection units form a reflection block, < >>The reflection blocks form an IRS array of the discrete phase adjustable intelligent reflection surface. Also, the number of rows and columns in each reflector block may be the same or different, for example: the reflection block is composed of 2 rows and 3 columns of reflection units, or 2 rows and 2 columns of reflection units.
Each reflective element is a t-bit, where t is greater than or equal to 1. The number of bits of the reflective element determines the number of states that can be taken, i.e. the number of states of the t-bit reflective element isA kind of module is assembled in the module and the module is assembled in the module. Taking t=2, i.e. the reflecting elements are 2-bits as an example, each reflecting element has 4 phase-adjustable, i.e. the code word of each reflecting element has 4 states, the code word of each state having a corresponding amplitude response and phase response.
Each reflecting unit can independently adjust the amplitude and phase of the incident signal, so the signal response of the reflecting unit is:
，
wherein,,for emitting signals->For incident signal +.>For amplitude response, ++>Is a phase response.
Code word of each reflection unitThe amplitude phase response corresponding thereto, the codeword constituting the reflection unit, may be expressed as:
，
wherein,,representing a size of +.>Is a codeword->The values of {0,1,2, … }>Corresponding amplitude phase response +.>There is->And (5) taking a value.
For example, t=2, i.e. a 2-bit reflection unit having a state number of. Each reflection unit can independently adjust the amplitude and phase of an incident signal, so that the signal response of the 2-bit reflection unit is as follows:
。
code word of each reflection unitThe amplitude phase response corresponding thereto, the codeword constituting the reflection unit, may be expressed as:
，
among them, preferable areThe control of the state in these 4 can be performed for the reflecting unit.
In the embodiment of the invention, the discrete phase adjustable intelligent reflecting surface based on the t-bit reflecting unit is divided into blocks, and compared with the continuous phase adjustable IRS, the digital coding and the programmable super-surface complexity of the discrete phase adjustable intelligent reflecting surface are much lower, and the control of the reflecting unit is simple.
S102, traversing states of all reflection units in the reflection block according to the bit number of the reflection unit so as to combine codewords of all the reflection units in the reflection block to obtain a plurality of codeword combinations of the reflection block.
As can be seen from the above description, the reflecting units with different numbers of bits have different numbers of states, and each state has a corresponding amplitude phase response pair, i.e. the codeword of each reflecting unit corresponds to a different amplitude phase response pair. Traversing the states of all the reflecting units in the transmitting block according to the bit number of the reflecting units in the reflecting block, and combining the code words of the reflecting units according to the states of the reflecting units in a permutation and combination mode to obtain a plurality of code word combinations of the reflecting block. Wherein the number includes at least one.
Taking the example that 4 reflecting units of 2-tit exist in the reflecting block, the corresponding states of each reflecting unit are four, and the code words of the reflecting units in different states are extracted from the code words corresponding to the 4 reflecting units in sequence according to an arrangement mode to form corresponding code word combinations.
To be used forThe reflecting units form a reflecting block, and the code words of all the reflecting units in the reflecting block are combined to obtain the code word combination of the reflecting block >Wherein->Code word representing 1 st reflection unit in reflection block, ">Code word representing the 2 nd reflection unit in the reflection block, and>code words representing the last reflection unit of the reflection units, each code word corresponding to +.>The amplitude phase response is responsive to.
S103, determining amplitude phase response pairs of each codeword combination according to the amplitude phase response pairs corresponding to each codeword in the reflection block.
Specifically, firstly, the position information of the block center point of the reflection block and the position information of each reflection unit in the reflection block are obtained; determining a phase difference of each reflection unit in the reflection block based on the position information of the block center point of the reflection block and the position information of each reflection unit in the reflection block; and determining amplitude phase response pairs of the codeword combinations according to the amplitude phase response pairs corresponding to all codewords in the reflection block and the phase difference of each reflection unit.
To be used forThe reflecting units form a reflecting block, as shown in FIG. 3, for example, assuming that the reflecting units in the emitting block are positioned close enough to each other, +.>Is of unit length, the length of the reflecting unit is +.>The position information of the center point of the reflection block is Then each reflection unit in the reflection block is +.>The location information of (2) may be +.>Wherein->Representing the +.>Go (go)/(go)>Representing the +.>Column (S)/(S)>，/>. With the center point of the reflection block as the reference point, the reflection unit in the reflection block is +.>The position vectors of (a) are:
，
reflection unitThe phase difference relative to the reference point is:
，
wherein,,indicate wavelength, & lt + & gt>Unit vector representing incident signal, < >>A unit vector representing the outgoing signal.
The signal response of the reflector block is:
，
wherein,,；
。
wherein,,amplitude response corresponding to the codeword combination representing the reflection block, < ->Code word group for representing reflection blockAnd the corresponding phase responses are combined.
In the embodiment of the invention, all codeword combinations traversing the reflection block, i.e. each reflection unit, are traversedThe number of states, the codeword combination and its corresponding amplitude phase response can be expressed as:
，
wherein,,i.e. there is total +.>A codeword combination.
S104, constructing a codebook of each reflection block based on all codeword combinations of the reflection blocks and amplitude phase response pairs of the codeword combinations.
Fig. 4 is a flowchart of step S104 provided in the embodiment of the present invention, and as shown in fig. 4, step S104 may be implemented at least by the following steps:
S401, distributing the phase response of each code word combination into a corresponding temporary set according to the phase value of the phase response of each code word combination in the reflection block.
Before step S401, as shown in fig. 5, L temporary sets are set according to a preset codebook length L; will beIs equally divided into L phase value ranges and the L phase value ranges are allocated to the corresponding temporary sets. The phase value ranges of each temporary set are different from each other.
For example, if the preset codebook length is 4, 4 temporary sets are set, which are respectively:；
will beThe phase equal proportion of (2) is divided into 4 phase value ranges which are distributed to 4 temporary sets, and the phase equal proportion is respectively as follows:
in an embodiment of the present invention, the phase response of each codeword combination in a reflection block is determinedThe phase value range belonging to which temporary set is put into the corresponding temporary set, as shown in fig. 5.
For example, ifWill->Put in->The method comprises the steps of carrying out a first treatment on the surface of the If->Then->Put in->，/>。
S402, determining the phase response closest to the corresponding preset phase response value in each temporary set.
The preset phase response value may be:，/>. In the embodiment of the invention, each temporary set has a corresponding phase value range, and the intermediate value of the phase value range corresponding to the temporary set can be used as a preset phase response value.
At each of theIn the set, find the phase response of which the phase is closest to the preset phase response threshold +.>。
S403, combining the code word corresponding to the phase response closest to the corresponding preset phase response value in each temporary set as an optimal code word combination.
For example, if the phase response closest to the corresponding predetermined phase response value in a temporary set isThe corresponding codeword combination is +.>。
S404, constructing a codebook of the corresponding reflection block according to each optimal codeword combination and the amplitude phase response pair corresponding to the optimal codeword combination.
In the embodiment of the present invention, the optimal codeword combination and its corresponding amplitude phase response can be expressed as:the codebook of the composed reflection blocks is:
。
in some embodiments of the present invention, before step S401, as shown in fig. 5, the method for controlling a discrete phase adjustable intelligent reflection surface according to the embodiment of the present invention further includes:
determining whether the amplitude response of each codeword combination in the reflection block is less than a preset amplitude response threshold;
and deleting the code word combinations smaller than the preset amplitude response threshold value.
For example, as shown in FIG. 5, the preset amplitude response threshold may be the lowest amplitude。
In the embodiment of the invention, the code word combination with smaller amplitude response has smaller system gain, so that the preset amplitude response threshold value is set, and the code word combination with smaller amplitude response is filtered, namely redundant codes are removed, thereby greatly reducing the complexity of constructing the reflection area block codebook.
S105, controlling the reflecting units in the reflecting blocks according to the codebook of the reflecting blocks of the discrete phase adjustable intelligent reflecting surface.
Fig. 6 is a flowchart of step S105 provided in the embodiment of the present invention, and as shown in fig. 6, step S105 in the embodiment of the present invention may be implemented at least by the following steps:
s601, obtaining a continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable intelligent reflection surface.
The optimal value of the continuous phase reflection matrix is the continuous phase reflection matrix corresponding to the maximum value of the channel capacity of the communication system based on the discrete phase adjustable intelligent reflection surface.
Specifically, the channel state of a communication system based on the discrete phase adjustable intelligent reflecting surface, the number of antennas of a signal transmitting antenna and a signal receiving antenna and the number of blocks of a reflecting block of the discrete phase adjustable intelligent reflecting surface are obtained; and determining the continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable intelligent reflecting surface according to the channel state of the communication system, the number of the antennas of the signal transmitting antenna and the signal receiving antenna and the number of the blocks of the reflecting block of the discrete phase adjustable intelligent reflecting surface.
Wherein the channel state comprises: transmitting-intelligent reflector link channel state, intelligent reflector-receiver link channel state, and transmitting-receiver link channel state.
In a communication system based on a discrete phase tunable intelligent reflecting surface, as shown in fig. 7. The number of antennas at the transmitting end and the receiving end of the communication system are respectivelyAnd->The number of the reflection blocks of the discrete phase adjustable intelligent reflection surface is +.>. The transmitted signal vector, the received signal vector and the gaussian white noise vector are respectively:
；
；
；
wherein,,representing variance->Representing the identity matrix.
Total transmitting power isCovariance matrix of transmitted signal>Defined as->Wherein->，/>Is a positive definite matrix.
The channel state of the transmitting end-IRS link is as follows:；
the IRS-receiving end link channel state is:；
the link channel state of the transmitting end and the receiving end is as follows:。
defining a reflection matrix of the discrete phase adjustable intelligent reflecting surface assuming no loss in reflection of the discrete phase adjustable intelligent reflecting surfaceThen, the equivalent channel matrix of the intelligent reflection surface auxiliary communication system with adjustable discrete phase is as follows:
；
the receiving-side signal is expressed as:
；
the channel capacity is:
。
thus obtaining the intelligent reflecting surface reflection matrix by solving the maximum value of the channel capacityAnd covariance matrix of the transmitted signal>And (5) jointly optimizing the matrix to obtain the optimal value of the continuous phase reflection matrix.
Specifically, the optimal value of the continuous phase reflection matrix can be obtained according to a continuous phase adjustable IRS optimization algorithm:
；
Wherein,,the +.>The phase optimum value of the reflection unit,。
s602, finding the phase response closest to the optimal value of the continuous phase reflection matrix corresponding to the reflection block from the codebook corresponding to the reflection block as the target phase response of the reflection block.
To obtain the target phase response of the first reflection blockFor example, a codebook for each reflection block of a discrete phase tunable smart reflective surfaceFrom codebook->Find the optimum value of the continuous phase reflection matrix corresponding to +.>Is the closest phase response +.>As a target phase response of the reflection block and obtaining a corresponding target amplitude response +.>Wherein, the method comprises the steps of, wherein,，/>. Finding out the target phase response and the target amplitude response of all other reflection blocks by the same method, and obtaining the reflection matrix of the intelligent reflection surface with adjustable discrete phase as
In some embodiments of the present invention, the optimal value of the discrete phase tunable intelligent reflector reflection matrix is obtained in step S602Afterwards, a water injection algorithm and the obtained discrete phase adjustable intelligent reflecting surface reflection matrix can be utilized>Optimizing a transmitting end covariance matrix of a communication systemQAnd the covariance matrix of the optimized transmitting end is obtained QAnd fed back to the transmitting end. Optimizing the reflection matrix by combining>And transmitting end covariance matrixQTo obtain a maximum channel capacity of the discrete phase tunable smart reflector assisted communication system.
Specifically, by the above-mentioned reflection matrixObtaining the communication system channel and SVD decomposing it, there is
Wherein,,，/>representing the maximum data stream that the channel can transmit. OptimizationQThe value is
/>
Wherein,,to be allocated to the first through the water filling algorithmiPower optimum of the data stream. Is obtained by water filling algorithm
Wherein,,satisfy->。
S603, controlling the reflection units of the reflection blocks based on the target phase response of the reflection blocks.
Specifically, the target phase response of each reflection block is determinedCorresponding codeword combinationAs a target code; and controlling the reflecting units of the reflecting block according to the target codes of the reflecting block and the amplitude phase response corresponding to the target codes.
Further, according to the target codingFind the codeword of each reflection unit in the reflection block +.>Each codeword corresponds to a state of the reflective element. By applying different voltages to the reflective element, the reflective element will assume different states. Accordingly, the controller of the reflection block adjusts the voltage of each reflection unit according to the codeword of each reflection unit so that the phase response of the reflection block is the target phase response.
As shown in fig. 8, in the embodiment of the present invention, in the case that all the reflection blocks complete the optimization adjustment, it is indicated that the discrete phase adjustment of the intelligent reflection surface is completed.
In the embodiment of the invention, the discrete phase adjustable IRS optimization algorithm is realized through the continuous phase adjustable IRS optimization algorithm, and compared with the traditional exhaustive traversal method, the complexity of the algorithm is greatly reduced, and the time cost is saved.
In some embodiments of the present invention, the number of reflection units in each reflection block in the discrete phase adjustable intelligent reflection surface is the same and the arrangement manner of the reflection units is the same, as shown in fig. 2, when the number of reflection units in each reflection block is the same and the arrangement manner of the reflection units is the same, the codebook of each reflection block is the same, so that the complexity of constructing the codebook of the reflection block can be further reduced. It can be understood that each reflection block in the discrete phase adjustable intelligent reflection surface can be different, and a corresponding codebook can be built for each reflection block according to the method provided by the embodiment of the invention.
The control method of the discrete phase adjustable intelligent reflecting surface provided by the embodiment of the invention comprises the steps of firstly dividing the discrete phase adjustable intelligent reflecting surface into a plurality of reflecting blocks, wherein each reflecting block comprises a plurality of reflecting units, then acquiring code words of each reflecting unit in the reflecting blocks in the discrete phase adjustable intelligent reflecting surface, and determining amplitude phase response pairs corresponding to each code word; traversing the states of all the reflecting units in the reflecting block according to the bit number of each reflecting unit, and combining the code words of all the reflecting units in the reflecting block to obtain a plurality of code word combinations of the reflecting block; then, according to the amplitude phase response corresponding to all the code words in the reflection block, determining the amplitude phase response of each code word combination; constructing a codebook of the reflection block based on the codeword combination of the reflection block and the amplitude phase response of the codeword combination; and finally, controlling the reflecting units in the reflecting blocks according to the codebook of the reflecting blocks of the discrete phase adjustable intelligent reflecting surface. In the technical scheme provided by the embodiment of the invention, the discrete phase adjustable intelligent reflecting surface is subjected to block division, the array design of the discrete phase adjustable intelligent reflecting surface is completed by combining the reflecting blocks, and the codebook corresponding to each reflecting block is generated by utilizing the amplitude and phase characteristics of the reflecting units in the reflecting blocks, so that the complexity of controlling the reflecting units is greatly reduced, the calculation cost of channel estimation is reduced, the discrete phase adjustable intelligent reflecting surface is effectively controlled in real time, and the time delay of a communication system based on the discrete phase adjustable intelligent reflecting surface is reduced, so that the communication efficiency is improved.
Based on the above-mentioned control method of the intelligent reflection surface with adjustable discrete phase, the embodiment of the invention also provides a control device of the intelligent reflection surface with adjustable discrete phase, as shown in fig. 9, the control device includes:
a first determining unit 910, configured to obtain codewords of the reflecting unit of the discrete phase adjustable intelligent reflecting surface, and determine an amplitude phase response pair corresponding to each codeword; wherein the discrete phase adjustable intelligent reflective surface comprises a plurality of reflective blocks, each reflective block comprising a plurality of reflective units; the amplitude phase response pair includes: amplitude response and phase response;
a combining unit 920, configured to traverse states of all the reflection units in the reflection block according to the number of bits of the reflection unit, and combine codewords of all the reflection units in the reflection block to obtain a plurality of codeword combinations of the reflection block;
a second determining unit 930, configured to determine an amplitude phase response pair of each codeword combination according to an amplitude phase response pair corresponding to each codeword in the reflection block;
a codebook unit 940, configured to construct a codebook of each of the reflection blocks based on the codeword combinations of each of the reflection blocks and amplitude-phase response pairs of the codeword combinations;
A control unit 950 for controlling the reflection units in the reflection blocks based on the codebook of the reflection blocks according to the discrete phase adjustable smart reflection surface.
In some embodiments of the present invention, the control unit 950 is specifically configured to:
acquiring a continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable intelligent reflection surface; the optimal value of the continuous phase reflection matrix is a continuous phase reflection matrix corresponding to the maximum value of the channel capacity of the communication system based on the discrete phase adjustable intelligent reflection surface;
determining the phase response closest to the optimal value of the continuous phase reflection matrix in the codebook according to the codebook of each reflection block and the corresponding optimal value of the continuous phase reflection matrix, and taking the phase response as the target phase response of the reflection block;
controlling the reflection units in the reflection blocks based on target phase responses of the reflection blocks and target amplitude responses corresponding to the target phase responses.
Based on the above control method of the intelligent reflection surface with adjustable discrete phase, the embodiment of the invention also provides a terminal, as shown in fig. 10, which comprises at least one processor (processor) 110; a display screen 120; and a memory 130, which may also include a communication interface (Communications Interface) 140 and a bus 150. Wherein the processor 110, the display 120, the memory 130, and the communication interface 140 may communicate with each other via the bus 150. The display screen 120 is configured to display a user guidance interface preset in the initial setting mode. The communication interface 140 may transmit information. The processor 110 may invoke logic instructions in the memory 130 to perform the methods of the embodiments described above.
In addition, the logic instructions in the memory 130 may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 130, as a computer-readable storage medium, may be configured to store a software program, a computer-executable program, such as program instructions or modules corresponding to the methods in the embodiments of the present disclosure. The processor 110 executes the software programs, instructions or modules stored in the memory 130 to perform the functional applications and data processing, i.e. to implement the control method of the discrete phase tunable intelligent reflective surface in the above-described embodiments.
Memory 130 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of the terminal, etc. In addition, the memory 130 may include a high-speed random access memory, and may also include a nonvolatile memory. For example, a plurality of media capable of storing program codes such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or a transitory storage medium may be used.
Based on the above-mentioned control method of the discrete phase adjustable intelligent reflecting surface, the embodiment of the invention also provides a computer readable storage medium, which is characterized in that the computer readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in the control method of the discrete phase adjustable intelligent reflecting surface as described in any one of the above.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts of the embodiments are all referred to each other, and each embodiment is mainly described in the differences from the other embodiments. In particular, for the apparatus, terminal and medium embodiments, the description is relatively simple, as it is substantially similar to the method embodiments, with reference to the partial description of the method embodiments being relevant.
The device, the terminal, the medium and the method provided in the embodiments of the present application are in one-to-one correspondence, so that the device, the terminal and the medium also have similar beneficial technical effects to the corresponding methods, and since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the device, the terminal and the medium are not described in detail here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Of course, those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by a computer program for instructing relevant hardware (e.g., processor, controller, etc.), the program may be stored on a computer readable storage medium, and the program may include the above described methods when executed. The computer readable storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (14)
1. A method for controlling a discrete phase adjustable intelligent reflecting surface, the method comprising:
acquiring code words of reflection units in a reflection block of the discrete phase adjustable intelligent reflection surface, and determining amplitude phase response pairs corresponding to each code word; wherein the discrete phase adjustable intelligent reflective surface comprises a plurality of reflective blocks, each reflective block comprising a plurality of reflective units; the amplitude phase response pair includes: amplitude response and phase response;
traversing states of all the reflecting units in the reflecting block according to the bit number of the reflecting units so as to combine codewords of all the reflecting units in the reflecting block to obtain a plurality of codeword combinations of the reflecting block;
determining amplitude phase response pairs of each codeword combination according to the amplitude phase response pairs corresponding to each codeword in the reflection block;
constructing a codebook of the reflection block based on the codeword combination of the reflection block and an amplitude phase response pair of the codeword combination;
controlling the reflection units in the reflection blocks based on the codebook of the reflection blocks according to the discrete phase adjustable intelligent reflection surface.
2. The method according to claim 1, wherein said controlling the reflection units in the reflection blocks based on a codebook of the reflection blocks according to the discrete phase adjustable smart reflection surface, in particular comprises:
acquiring a continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable intelligent reflection surface; the optimal value of the continuous phase reflection matrix is a continuous phase reflection matrix corresponding to the maximum value of the channel capacity of the communication system based on the discrete phase adjustable intelligent reflection surface;
determining the phase response closest to the optimal value of the continuous phase reflection matrix in the codebook according to the codebook of the reflection block and the optimal value of the continuous phase reflection matrix corresponding to the reflection block, and taking the phase response as the target phase response of the reflection block;
the reflection units of the respective reflection blocks are controlled based on the target phase responses of the respective reflection blocks.
3. The method of claim 2, wherein controlling the reflection unit of each reflection block based on the target phase response of each reflection block, specifically comprises:
determining a code word combination corresponding to the target phase response of each reflection block as target coding;
Controlling a reflection unit in the reflection block according to the target code of the block and the amplitude phase response corresponding to the target code;
wherein the amplitude phase response pair comprises: amplitude response and phase response.
4. The method according to claim 1, wherein said constructing a codebook of said reflection block based on said codeword combination of said reflection block, an amplitude phase response of said codeword combination, comprises:
distributing the phase response of each code word combination to a corresponding temporary set according to the phase value of the phase response of each code word combination in the reflection block; the phase value ranges of the temporary sets are different from each other;
determining the phase response closest to the corresponding preset phase response value in each temporary set;
the code word combination corresponding to the phase response closest to the corresponding preset phase response value in each temporary set is used as an optimal code word combination;
and constructing a codebook of the corresponding reflection block according to each optimal codeword combination and the amplitude phase response corresponding to the optimal codeword combination.
5. The method of claim 4, wherein prior to assigning the phase responses of each of the codeword combinations into respective temporary sets based on the phase values of the phase responses of each of the codeword combinations in the reflector block, the method further comprises:
determining whether the amplitude response of each codeword combination in the reflection block is less than a preset amplitude response threshold;
and deleting the code word combination smaller than the preset amplitude response threshold value.
6. The method of claim 4, wherein prior to assigning the phase responses for each of the codeword combinations into respective temporary sets based on the phase values of the phase responses for each of the codeword combinations in the reflector block, the method further comprises:
setting L temporary sets according to a preset codebook length L;
equally dividing the phase of [0,2 pi ] into L phase value ranges, and distributing the L phase value ranges to the corresponding temporary sets.
7. The method of claim 1, wherein said determining the amplitude phase response for each of said codeword combinations from the amplitude phase response for each of said codewords in said reflection block, comprises:
Acquiring position information of a block center point of the reflection block and position information of each reflection unit in the reflection block;
determining a phase difference of each of the reflection units in the reflection block based on position information of the block center point of the reflection block, position information of each of the reflection units in the reflection block;
and determining amplitude phase response pairs of the code word combinations according to the amplitude phase response pairs corresponding to all the code words in the reflection block and the phase difference of each reflection unit.
8. The method of claim 1, wherein each of the reflective units is a t-bit, wherein t is greater than or equal to 1, and wherein bit is the number of bits of the reflective unit.
9. The method according to claim 2, wherein the obtaining the continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable smart reflection surface specifically includes:
acquiring a channel state of a communication system based on the discrete phase adjustable intelligent reflecting surface, the number of antennas of a signal transmitting antenna and a signal receiving antenna, and the number of blocks of the reflecting block of the discrete phase adjustable intelligent reflecting surface; wherein the channel state at least includes: the transmitting terminal intelligent reflecting surface link channel state, the intelligent reflecting surface receiving terminal link channel state and the transmitting terminal receiving terminal link channel state;
And determining the optimal value of the continuous phase reflection matrix corresponding to the discrete phase adjustable intelligent reflecting surface according to the channel state, the number of the antennas of the signal transmitting antenna and the signal receiving antenna and the number of the blocks of the reflecting block of the discrete phase adjustable intelligent reflecting surface.
10. The method of claim 9, wherein after determining the continuous phase reflection matrix optimum value for the discrete phase tunable smart reflective surface, the method further comprises:
and optimizing a transmitting end covariance matrix of the communication system by using a water injection algorithm based on the continuous phase reflection matrix optimal value of the discrete phase adjustable intelligent reflecting surface, and obtaining the maximum channel capacity of the communication system assisted by the discrete phase adjustable intelligent reflecting surface by jointly optimizing the reflection matrix and the transmitting end covariance matrix.
11. A control device for a discrete phase-adjustable intelligent reflecting surface, the device comprising:
the first determining unit is used for obtaining the code word of each reflecting unit in the reflecting block of the discrete phase adjustable intelligent reflecting surface and determining an amplitude phase response corresponding to each code word; wherein the intelligent reflective surface comprises a plurality of reflective blocks, each reflective block comprising a plurality of reflective units; the amplitude phase response pair includes: amplitude response and phase response;
The combination unit is used for traversing the states of all the reflection units in the reflection block according to the bit number of the reflection unit so as to combine the code words of all the reflection units in the reflection block to obtain a plurality of code word combinations of the reflection block;
a second determining unit, configured to determine an amplitude phase response pair of each codeword combination according to an amplitude phase response pair corresponding to each codeword in the reflection block;
a codebook unit, configured to construct a codebook of each reflection block based on the codeword combinations of each reflection block and amplitude-phase response pairs of the codeword combinations;
and the control unit is used for controlling the reflecting units in the reflecting blocks based on the codebook of the reflecting blocks of the intelligent reflecting surface with the adjustable discrete phases.
12. The control device according to claim 11, characterized in that the control unit is specifically configured to:
acquiring a continuous phase reflection matrix optimal value corresponding to the discrete phase adjustable intelligent reflection surface;
determining the phase response closest to the optimal value of the continuous phase reflection matrix in the codebook according to the codebook of each reflection block and the optimal value of the continuous phase reflection matrix corresponding to each reflection block, and taking the phase response as the target phase response of the reflection block;
Controlling the reflection units in the reflection blocks based on target phase responses of the reflection blocks and target amplitude responses corresponding to the target phase responses.
13. A terminal, comprising: a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the processor, when executing the computer readable program, implements the steps of the discrete phase adjustable intelligent reflector control method as claimed in any one of claims 1-10.
14. A computer readable storage medium storing one or more programs executable by one or more processors to implement the steps in the discrete phase tunable intelligent reflector control method of any of claims 1-10.
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| WO2022122717A1 (en) * | 2020-12-07 | 2022-06-16 | Sony Group Corporation | Multiple spatial data streams via a re-configurable reflective device |
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| US9883511B1 (en) * | 2012-12-05 | 2018-01-30 | Origin Wireless, Inc. | Waveform design for time-reversal systems |
| CN111953391A (en) * | 2020-07-09 | 2020-11-17 | 东南大学 | Intelligent reflector assisted multi-user MIMO uplink energy efficiency and spectrum efficiency combined optimization method |
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