CN114244446B - System, method and equipment for realizing signal coverage based on Orbital Angular Momentum (OAM) - Google Patents
System, method and equipment for realizing signal coverage based on Orbital Angular Momentum (OAM) Download PDFInfo
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Abstract
The embodiment of the disclosure discloses a system, a method and equipment for realizing signal coverage based on Orbital Angular Momentum (OAM), wherein the system comprises: the first modulation module is used for loading the data sent by the data channel of the cell onto an OAM carrier for modulation; the second modulation module is used for loading the data sent by the control channel of the cell onto the OAM carrier for modulation; or the data sent by the control channel of the cell is loaded on a non-OAM carrier for modulation. According to the technical scheme, the corresponding modulation mode is selected for the data transmitted by the data channel and the control channel, and the data volume of the data channel is increased by utilizing the OAM carrier wave to carry out signal modulation, while the data volume of the control channel is smaller, so that the control channel can be modulated by adopting a non-OAM carrier wave, and the OAM carrier wave can be adopted to realize OAM signal coverage in a mobile network area.
Description
Technical Field
The disclosure relates to the technical field, in particular to a system, a method and equipment for realizing signal coverage based on Orbital Angular Momentum (OAM).
Background
Orbital angular momentum (Orbital Angular Momentum, OAM) based wireless communication is one of the topics of recent popularity in the field of communications. The OAM wave has different swirling wave fronts, annular energy distribution, strong directivity according to the characteristic of the angular quantum number thereof, and the OAM wave of different angular quantum numbers (also called different modes) has integral orthogonality. That is, the OAM waves of different modes can realize different information transmission in the same frequency domain, the same time domain and the same space, thereby greatly improving the capacity of the communication system. At present, in the field of mobile wireless communication (microwave section), because the adopted frequency is lower than that of optical communication, the transmitting and receiving modes are limited, and the signal coverage mode is less researched aiming at the characteristics of large number of terminals, mobility and the like.
Disclosure of Invention
In order to solve the problems in the related art, embodiments of the present disclosure provide a system, a method, and an apparatus for implementing signal coverage based on orbital angular momentum OAM.
In a first aspect, an embodiment of the present disclosure provides a system for implementing signal coverage based on orbital angular momentum OAM.
Specifically, the system for realizing signal coverage based on Orbital Angular Momentum (OAM) comprises:
the first modulation module is used for loading the data sent by the data channel of the cell onto an OAM carrier for modulation;
the second modulation module is used for loading the data sent by the control channel of the cell onto the OAM carrier for modulation; or the data sent by the control channel of the cell is loaded on a non-OAM carrier for modulation.
Optionally, the data sent by the control channel includes: a data channel frequency point, a data channel OAM parameter set; the data channel OAM parameter set includes: OAM mode and OAM transmission type on the data channel frequency point.
Optionally, the local cell and the adjacent cell adopt OAM carriers of different modes for networking, and frequencies of the OAM carriers of different modes are the same, different or have frequency intersections; and/or
When the signals which are loaded on the OAM carrier by the cell and modulated are multipath signals, the multipath signals adopt different OAM modes.
Optionally, the first modulation module and the second modulation module include:
the first transmitting sub-module is used for transmitting the OAM signal which is loaded on the OAM carrier wave for modulation through the UCA array; and/or
And the second transmitting sub-module is used for transmitting the plane wave signal to the intelligent reflecting surface to obtain an OAM signal and transmitting the OAM signal on the OAM carrier.
Optionally, the first emission sub-module includes:
and the adjusting unit is used for adjusting the field intensity loop radius or the divergence angle of the multi-path signal loaded OAM carrier wave with different modes after the propagation distance z.
Optionally, the adjusting unit includes:
a determining subunit, configured to determine a mode set U of OAM carriers in different modes;
the adjusting subunit is used for adjusting the field intensity ring radius of the OAM carriers in different modes in the mode set U to the preset field intensity ring radius by taking the preset field intensity ring radius as a reference; or adjusting the divergence angles of OAM carriers of different modes in the mode set U within a preset error range by taking a preset divergence angle as a reference;
the preset field intensity loop radius or the preset divergence angle is a specified value or is calculated according to the wavelength of an OAM carrier wave of one mode in the mode set U and the UCA array radius.
Optionally, the modulation subunit is a phase shift unit on the intelligent reflecting surface.
Optionally, the intelligent reflecting surface is a quasi-talbot effect surface, and n circular quasi-talbot vortex phase units are arranged on the quasi-talbot effect surface, the n circular quasi-talbot vortex phase units form a positive Nlen polygon, and the center point of each circular quasi-talbot vortex phase unit is on the vertex of the positive Nlen polygon;
and the second transmitting submodule uses the quasi-Talbot vortex phase unit to adjust the phase of the plane wave signal to obtain the OAM signal.
In a second aspect, an embodiment of the present disclosure provides a method for implementing signal coverage based on orbital angular momentum OAM.
Specifically, the method for realizing signal coverage based on Orbital Angular Momentum (OAM) comprises the following steps:
loading the data sent by the data channel of the cell onto an OAM carrier for modulation;
loading data sent by a control channel of the cell onto the OAM carrier for modulation; or the data transmitted by the control channel of the cell is loaded on a non-OAM carrier for modulation
In a third aspect, an embodiment of the present disclosure provides an electronic device comprising a memory and a processor, wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to perform the method steps of:
loading the data sent by the data channel of the cell onto an OAM carrier for modulation;
loading data sent by a control channel of the cell onto the OAM carrier for modulation; or the data sent by the control channel of the cell is loaded on a non-OAM carrier for modulation.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
according to the system for realizing signal coverage based on Orbital Angular Momentum (OAM) provided by the embodiment of the disclosure, corresponding modulation modes are selected for data transmitted by a data channel and a control channel, and the data quantity usually transmitted by the data channel is considered to be large, such as audio and video data, but the OAM has the advantages that the ultra-large bandwidth/ultra-large access quantity is realized by using different modes, the channel capacity can be improved by utilizing an OAM carrier for signal modulation, and the data quantity transmitted by the control channel is smaller, so that the control channel can be modulated by adopting a non-OAM carrier, and the OAM carrier modulation can be adopted, so that OAM signal coverage in a mobile network area can be realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Other features, objects and advantages of the present disclosure will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a schematic diagram illustrating a system for implementing signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure;
fig. 2 shows an OAM field intensity distribution with an OAM mode of 1 and a round quasi-talbot vortex phase element number of 6 as a phase distribution diagram;
fig. 3 is a schematic diagram showing the effect of forming the relationship among the coverage radius, the number of sub-loops and the transmission distance of the OAM signal coverage area;
fig. 4 is a schematic diagram showing a receiver radius variation of OAM signals found using quasi-talbot effect plane transmission OAM signals versus UCA array antennas;
fig. 5 is a schematic diagram illustrating the formation of an OAM signal coverage area;
fig. 6 illustrates a flowchart of a method of implementing signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure;
fig. 7 shows a block diagram of an electronic device according to an embodiment of the disclosure;
fig. 8 illustrates a schematic diagram of a computer system suitable for use in implementing a method for implementing signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. In addition, for the sake of clarity, portions irrelevant to description of the exemplary embodiments are omitted in the drawings.
In this disclosure, it should be understood that terms such as "comprises" or "comprising," etc., are intended to indicate the presence of features, numbers, steps, acts, components, portions, or combinations thereof disclosed in this specification, and are not intended to exclude the possibility that one or more other features, numbers, steps, acts, components, portions, or combinations thereof are present or added.
In addition, it should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
At present, in the field of mobile wireless communication (microwave section), because the adopted frequency is lower than that of optical communication, the transmitting and receiving modes are limited, and the signal coverage mode is less researched aiming at the characteristics of large number of terminals, mobility and the like.
The present disclosure is provided to at least partially solve the problems in the prior art discovered by the inventors.
Fig. 1 is a schematic diagram illustrating a system for implementing signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure. As shown in fig. 1, the system 100 for implementing signal coverage based on orbital angular momentum (Orbit Angle Momentum, OAM) includes: a first modulation module 110 and a second modulation module 120. The first modulation module 110 is configured to load data sent by the data channel of the cell onto an OAM carrier for modulation. The second modulation module 120 is configured to load data sent by the control channel of the cell onto the OAM carrier for modulation; or the data sent by the control channel of the cell is loaded on a non-OAM carrier for modulation.
According to the system for realizing signal coverage based on Orbital Angular Momentum (OAM), the corresponding modulation mode is selected for data transmitted by the data channel and the control channel, and the data channel is considered to be large in data volume, such as audio and video data, which is usually transmitted by the data channel. In this disclosure, the non-OAM carrier may be a plane wave or other waveform. Those skilled in the art will appreciate that the data sent by the control channel may also be modulated using an OAM carrier, which is not limited by this disclosure.
According to an embodiment of the present disclosure, the data transmitted by the control channel includes: a data channel frequency point, a data channel OAM parameter set; the data channel OAM parameter set includes: OAM mode and OAM transmission type on the data channel frequency point. The OAM modes are different OAM modes of orbital angular momentum, the OAM modes are represented by the number of modes l, and electromagnetic vortex waves of different numbers of modes l are mutually orthogonal. Such OAM-based multiplexing may potentially increase the system capacity and spectral efficiency of a wireless communication link without relying on traditional resources such as time and frequency. The OAM mode employed on the data channel bins may be single mode (same number of modes) or mixed mode (different number of modes), which is not limiting to the present disclosure. The OAM transmission type may be one or more of uniform circular array (Uniform Circular Array, UCA) transmission or UCA-like transmission or optical transmission.
According to the embodiment of the disclosure, the system for realizing signal coverage based on the orbital angular momentum OAM is applied to a scene of mobile network communication, and in the scene, OAM carrier networking with different modes is adopted between the cell and the adjacent cell, and the system capacity can be improved on the basis of avoiding signal interference between cells in a different frequency networking mode. Specifically, if the number of modes of the OAM carrier adopted by the cell is l=1, the neighboring cell may adopt l=2; or the number of modes of the OAM carrier used by the own cell is l=1, l=2, for example, the neighboring cell may use l=3, l=4. That is, no matter the present cell adopts the single-mode or mixed-mode OAM carrier, the adjacent cell only needs to select different mode numbers. The cell and the adjacent cell adopt OAM carrier networking with different modes, the frequencies of the OAM carriers with different modes are not required, the frequencies can be the same, different or have frequency intersection, and signal interference among the cells can be avoided.
According to the embodiment of the disclosure, for the present cell, when the signal that is loaded onto the OAM carrier for modulation by the present cell is a multipath signal, the multipath signal adopts different OAM modes, so as to achieve simultaneous transmission of the multipath signal, and avoid interference between the multipath signals of the present cell. It can be understood that multiple signals in the cell may also adopt different OAM modes, and the frequency of the OAM carrier may be changed accordingly, which is not limited in this disclosure.
According to an embodiment of the present disclosure, the first modulation module 110 includes: a first transmitting sub-module 111 and/or a second transmitting sub-module 112. The first transmitting sub-module 111 is configured to transmit, through the UCA array, an OAM signal that is loaded onto the OAM carrier for modulation; the second transmitting sub-module 112 is configured to transmit the plane wave signal to the intelligent reflection surface to obtain an OAM signal, and transmit the OAM signal on the OAM carrier.
The present disclosure provides two embodiments of transmitting data transmitted by a data channel as an OAM signal, one is to directly generate an OAM carrier by using a UCA array, load the data to be transmitted onto the OAM carrier, and transmit the data, and the other is to transmit the data to be transmitted onto the OAM carrier through an intelligent reflective surface (Intelligent Reflecting Surface, IRS), also called an intelligent super-surface, a reconfigurable intelligent surface (Reconfigurable Intelligent Surface, RIS), the IRS performs phase processing on a received plane wave signal and reflects the plane wave signal to form an OAM signal, and the second transmitting submodule 12 may adjust a phase parameter of the IRS to obtain the OAM signal, and then transmit the OAM signal onto the OAM carrier.
It will be appreciated that the second modulation module 120 may also include the first transmission sub-module 111 and/or the second transmission sub-module 112, so as to modulate the data sent by the control channel into OAM signal transmission.
As will be further described below, a scheme is implemented in which the receiver receives all modes with a single UCA antenna in the case of using different OAM modes for the multipath signals of the cell.
The inventor finds that the mode-mixed OAM wave beam is transmitted to perform OAM multiplexing, improve the frequency spectrum utilization rate and resist Gaussian noise interference. Due to the different divergence angles of different modes under the condition of the same frequency and the same UCA emission radius, the receiver has difficulty in receiving all modes by using a single UCA antenna after transmitting for a certain distance. The field intensity loop radius of the transmitted mixed mode OAM is the same by adjusting the parameters of UCA transmitting antennas, thereby realizing the purpose that a receiver receives all modes by a single UCA antenna.
Let U be the OAM pattern set to be transmitted, then l (U) ∈U is the point in the spherical coordinate systemThe electric field at may be approximated as:
wherein r is the radial distance in the spherical coordinate system,for the azimuth angle in the spherical coordinate system,θ is the divergence angle, i.e. the elevation angle in the spherical coordinate system, N is the number of antenna elements, +.>Is the wave vector, lambda is the wavelength, l is the mode number, a is the radius of the transmitting array,/->As integral variable, J l Is a Bessel function of order I. It can be seen that if the field intensity loop radius of the defined mode is the maximum value of the light loop intensity, the longer the wavelength λ, the lower the frequency, and the smaller the transmission array radius a, the larger the OAM field intensity loop radius at the same location, that is, the larger the divergence angle θ. Field intensity loop radius r after OAM signal propagation distance z coord Angle of divergence theta coord The relation of (2) is thatWhen the OAM carrier wave of a plurality of modes in the U is transmitted, the product (namely ka) of the frequency and the array radius can be adjusted, so that the maximum value of the U-order Bessel function of the l (U) epsilon is close to a certain extent, the field intensity distribution of the U-mode OAM ring is not annular, but the field intensity of each mode component is annular and the radius is approximately the same, and therefore the main lobe information of the plurality of modes is received at the same spatial position by a receiving end (such as a circular antenna array with a certain area size).
Specifically, the first transmitting sub-module 111 includes: and a modulating unit. The adjusting unit is used for adjusting the field intensity loop radius or divergence angle of the multi-path signal loaded OAM carrier wave with different modes after the propagation distance z.
According to an embodiment of the present disclosure, the adjusting unit includes: the determination subunit and the adjustment subunit. The determining subunit is used for determining a mode set U of OAM carriers with different modes; the adjusting subunit is used for adjusting the field intensity ring radius of the OAM carriers in different modes in the mode set U to the preset field intensity ring radius by taking the preset field intensity ring radius as a reference; or adjusting the divergence angles of OAM carriers of different modes in the mode set U within a preset error range by taking a preset divergence angle as a reference; the preset field intensity loop radius or the preset divergence angle is a specified value or is calculated according to the wavelength of an OAM carrier wave of one mode in the mode set U and the UCA array radius.
In the disclosed manner, the adjustment subunit can adjust the field intensity loop radius or divergence angle of the multi-path signal loaded OAM carrier wave with different modes after the propagation distance z in two ways.
One way is to preset the field intensity ring radius to be the field intensity ring radius of the OAM signal after the propagation distance z is needed by the receiver, so that the field intensity ring radius after the propagation distance z of the OAM carrier wave in different modes is adjusted to be the same; or the preset divergence angle is taken as a reference value, the preset divergence angle is taken as the divergence angle of the OAM signal after the propagation distance z is required by the receiver, and the divergence angles after the propagation distance z of the OAM carriers in different modes are adjusted by the reference value are within a preset error range, namely, within the range of theta' coord ＝(1±Δσ)θ coord Possible solutions for the following formula are found in the scope:
wherein Δσ is a preset error. The solution process of the above formula can be accomplished by a general higher mathematical method or by a numerical simulation software solution.
Another way is according to the wavelength lambda of OAM carrier of one of the modes in the mode set U 0 Radius a of UCA array 0 And calculating to obtain the radius of the preset field intensity ring, wherein the radius of the field intensity ring after the propagation distance z of the OAM carrier wave of other modes in the mode set U is adjusted is the same as the radius of the preset field intensity ring.
Specifically, the following formula is adopted:
where abs () represents the absolute value,the solving process of θ corresponding to the maximum value can be defined by a general higher orderThe mathematical method or the numerical simulation software is solved, and will not be described here. Or taking the divergence angle obtained by solving as a preset divergence angle, and adjusting the divergence angle of the OAM carrier wave propagation distance z of other modes in the mode set U within a preset error range based on the preset divergence angle.
The two ways have continuous solution space, i.e. there may be infinite discrete feasible solutions, but in practical applications, there are practical limits on the frequency band available for the modulation unit, the frequency point and the radius available for the UCA antenna array, so that the available and reasonable solutions can be selected. The divergence angles of the respective modes are coordinated to be θ by the adjusting means coord (or approximately theta coord ) The above solution is independent (or nearly independent) of z.
According to an embodiment of the present disclosure, the modulation subunit may be implemented by a large-scale antenna array, that is, by using antennas at different positions in the large-scale array and applying antenna phases accordingly.
According to an embodiment of the disclosure, the modulation subunit is a phase shift unit on the smart reflective surface. The adjustment of the radius of the UCA array can be achieved by the RIS, i.e., by adjusting the amount of phase shift of the phase shift elements on the RIS.
According to an embodiment of the disclosure, the intelligent reflecting surface is a quasi-talbot effect surface on which N is disposed len A circular quasi-Talbot vortex phase unit, N len The round quasi-Talbot vortex phase units form positive N len A polygon, and the center point of each circular quasi-Talbot vortex phase unit (hereinafter referred to as phase unit) is positive N len The vertex of the polygon;
and the second transmitting submodule uses the quasi-Talbot vortex phase unit to adjust the phase of the plane wave signal to obtain the OAM signal.
For the scenario that the receiver is a mobile terminal, considering that a group of UCA antennas can only realize coverage of one ring area, the quasi-Talbot effect surface is adopted to realize coverage of a large number of rings (depending on factors such as coverage area) so as to realize comprehensive OAM signal coverage in a certain area and ensure that the receiver can receive OAM signals in the certain area.
Definition of positive N len The radius of the circumcircle of the polygon is d, an x-y plane coordinate system is established, and the origin of the coordinates is positive N len The geometric center of the polygon, the coordinates of each phase element are expressed as (x cent，n ，y cent,n ) The n-th phase unit changes the current phase of the arriving phase plane signal by superimposing a vortex phase and a spherical phase thereto:
at points (x, y) on the effect plane phase element, when a single mode is emitted,
wherein phi is n Is the phase shift of the phase unit, l is the number of modes,lambda is wavelength, & lt & gt>For azimuth angle of nth phase unit, there is N len The phase units are->z target Is the distance from a plane parallel to the effect plane (the focal plane of the lens on the quasi-talbot effect plane) to the effect plane.
The quasi-Talbot effect generated OAM has UCA-like property, and the number of the unable-to-send-out modes is greater than or equal to N len And/2. To send out multiple modes, the OAM coverage area is at least a distance of (4-2 sin (2 pi/N) len /2))*Z target For example at least N len Only =6 can a mixed mode of l=1, l=2 be issued, i.e. less than 3Z target Is greater than 3Z where OAM signal coverage is not available target Can obtain OAM signal coverage, coverage and Z target D and frequency, transmit array radius. It should be noted that the above only includes the phaseThe phase distribution in the cell, at the location of the non-phase cell on the effect plane, does not transmit the signal arriving on that plane (i.e., masks the signal at that location).
When the mixed mode is emitted at the upper point (x, y) of the effect surface phase unit, the phases of the modes are overlapped,
thus, at points (x, y, z target The field strength at +d) is:
wherein D is the distance from the focal plane of the lens on the quasi-talbot effect plane;
namely, the OAM ring field coverage with dense distribution is provided, the coverage radius R is generally smaller than d, as shown in figures 2 and 3, the change condition of the coverage radius is basically stabilized at 0.8-0.9d along with the increase of the transmission distance. The number of radially upward sub-loops in the coverage area varies with distance, directly reflecting the variation in the number of maximum receivers that can be accommodated in the coverage area, as well as the variation in the resource utilization.
Since the OAM receiver generally needs to receive the entire OAM ring, the above method can reduce the receiver size to a large extent, with up to 45% radius reduction compared to UCA transmission, depending on the frequency band, modulus, distance, and scroll phase plane size. As shown in fig. 4, the quasi-talbot effect can reduce the size of the receiver compared to conventional UCAs, and can reduce the radius by approximately 48% after propagation of the z=15×d distance.
Fig. 5 shows a schematic diagram of forming an OAM signal coverage area. As shown in fig. 5, the wireless signal sent by the base station is a plane wave signal, and the phase parameter of the quasi-talbot effect plane is adjusted in real time according to the coverage requirements of azimuth, distance, frequency band, etc., and the plane wave signal is sent to the quasi-talbot vortex effect plane to form an OAM signal coverage area. Within the OAM signal coverage area, the receiver can receive the OAM signal. The OAM signal coverage area generated by the method does not need the alignment of the center of the receiver and the center of the quasi-Talbot effect surface, but still needs the normal direction parallel to the normal direction of the plane of the receiver to obtain the optimal receiving effect.
According to embodiments of the present disclosure, the quasi-talbot vortex effect plane may be implemented by a smart reflective surface IRS or a so-called reconfigurable smart surface RIS, namely: the phase shifting elements on the RIS can adjust the wavefront phase of the received signal according to the quasi-Talbot principle described above, with respective phi n This can be achieved by adjusting the reflection path length or the control signal reflection delay.
The phase shift distribution formula of the phase shift element on the RIS is:
where k=2pi/wavelength, is the wave vector; (x) i ，y i ) Is the coordinates of the phase shifting element. (x) n ，y n ) Is the central position coordinate of each lens of Talbot effect, f n Is the focal length of each lens of the quasi-talbot effect.
Fig. 6 illustrates a flowchart of a method of implementing signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure. As shown in fig. 6, the method for implementing signal coverage based on orbital angular momentum OAM includes steps S601-S602.
In step S601, data sent by a data channel of a cell is loaded onto an OAM carrier for modulation;
in step S602, data sent by the control channel of the cell is loaded onto the OAM carrier for modulation; or the data sent by the control channel of the cell is loaded on a non-OAM carrier for modulation.
Specific technical details of the embodiments of the present disclosure may be referred to the corresponding technical content of fig. 1 to 5, and are not described herein.
According to an embodiment of the present disclosure, the data transmitted by the control channel includes: a data channel frequency point, a data channel OAM parameter set; the data channel OAM parameter set includes: OAM mode and OAM transmission type on the data channel frequency point.
According to an embodiment of the disclosure, the present cell and the neighboring cell are networked by using OAM carriers of different modes, where frequencies of the OAM carriers of different modes are the same, different, or there is a frequency intersection; and/or
When the signals which are loaded on the OAM carrier by the cell and modulated are multipath signals, the multipath signals adopt different OAM modes.
According to an embodiment of the present disclosure, the method further comprises:
transmitting an OAM signal which is loaded on the OAM carrier wave for modulation through a UCA array; and/or
And transmitting the plane wave signal to an intelligent reflecting surface to obtain an OAM signal, and transmitting the OAM signal on the OAM carrier.
According to an embodiment of the present disclosure, the method further comprises:
and adjusting field intensity loop radius or divergence angle of OAM carrier wave propagation distance z of different modes of multipath signal loading.
According to an embodiment of the present disclosure, the adjusting a field intensity loop radius or a divergence angle after the OAM carrier propagation distance z of different modes of the multipath signal loading includes:
determining a mode set U of OAM carriers of different modes;
adjusting the field intensity ring radius of OAM carriers of different modes in the mode set U to the preset field intensity ring radius by taking the preset field intensity ring radius as a reference; or adjusting the divergence angles of OAM carriers of different modes in the mode set U within a preset error range by taking a preset divergence angle as a reference;
the preset field intensity loop radius or the preset divergence angle is a specified value or is calculated according to the wavelength of an OAM carrier wave of one mode in the mode set U and the UCA array radius.
According to the embodiment of the disclosure, the OAM signal is obtained after the phase of the plane wave signal is adjusted by using the quasi-Talbot vortex phase unit; wherein the intelligent reflecting surface is a quasi-TalbotA special effect surface, N is arranged on the quasi-Talbot effect surface len A circular quasi-Talbot vortex phase unit, N len The round quasi-Talbot vortex phase units form positive N len A polygon with a center point of each circular quasi-talbot vortex phase unit at positive N len At the vertices of the polygon.
The present disclosure also discloses an electronic device, and fig. 7 shows a block diagram of the electronic device according to an embodiment of the present disclosure.
As shown in fig. 7, the electronic device 700 includes a memory 701 and a processor 702; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory 701 is used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor 702 to implement the method steps of:
loading the data sent by the data channel of the cell onto an OAM carrier for modulation;
loading data sent by a control channel of the cell onto the OAM carrier for modulation; or the data sent by the control channel of the cell is loaded on a non-OAM carrier for modulation.
According to an embodiment of the present disclosure, the data transmitted by the control channel includes: a data channel frequency point, a data channel OAM parameter set; the data channel OAM parameter set includes: OAM mode and OAM transmission type on the data channel frequency point.
According to an embodiment of the disclosure, the present cell and the neighboring cell are networked by using OAM carriers of different modes, where frequencies of the OAM carriers of different modes are the same, different, or there is a frequency intersection; and/or
When the signals which are loaded on the OAM carrier by the cell and modulated are multipath signals, the multipath signals adopt different OAM modes.
According to an embodiment of the present disclosure, the one or more computer instructions are executed by the processor to perform the method steps of:
transmitting an OAM signal which is loaded on the OAM carrier wave for modulation through a UCA array; and/or
And transmitting the plane wave signal to an intelligent reflecting surface to obtain an OAM signal, and transmitting the OAM signal on the OAM carrier.
According to an embodiment of the present disclosure, the one or more computer instructions are executed by the processor to perform the method steps of:
and adjusting field intensity loop radius or divergence angle of OAM carrier wave propagation distance z of different modes of multipath signal loading.
According to an embodiment of the present disclosure, the adjusting a field intensity loop radius or a divergence angle after the OAM carrier propagation distance z of different modes of the multipath signal loading includes:
determining a mode set U of OAM carriers of different modes;
adjusting the field intensity ring radius of OAM carriers of different modes in the mode set U to the preset field intensity ring radius by taking the preset field intensity ring radius as a reference; or adjusting the divergence angles of OAM carriers of different modes in the mode set U within a preset error range by taking a preset divergence angle as a reference;
the preset field intensity loop radius or the preset divergence angle is a specified value or is calculated according to the wavelength of an OAM carrier wave of one mode in the mode set U and the UCA array radius.
According to the embodiment of the disclosure, the OAM signal is obtained after the phase of the plane wave signal is adjusted by using the quasi-Talbot vortex phase unit; wherein the intelligent reflecting surface is a quasi-Talbot effect surface, and N is arranged on the quasi-Talbot effect surface len A circular quasi-Talbot vortex phase unit, N len The round quasi-Talbot vortex phase units form positive N len A polygon with a center point of each circular quasi-talbot vortex phase unit at positive N len At the vertices of the polygon.
Fig. 8 illustrates a schematic diagram of a computer system suitable for use in implementing a method for implementing signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure.
As shown in fig. 8, the computer system 800 includes a processing unit (CPU) 801 that can execute various processes in the above-described embodiments according to a program stored in a Read Only Memory (ROM) 802 or a program loaded from a storage section 808 into a Random Access Memory (RAM) 803. In the RAM803, various programs and data required for the operation of the system 800 are also stored. The CPU801, ROM802, and RAM803 are connected to each other by a bus 804. An input/output (I/O) interface 805 is also connected to the bus 804.
The following components are connected to the I/O interface 805: an input portion 806 including a keyboard, mouse, etc.; an output portion 807 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and a speaker; a storage section 808 including a hard disk or the like; and a communication section 809 including a network interface card such as a LAN card, a modem, or the like. The communication section 809 performs communication processing via a network such as the internet. The drive 810 is also connected to the I/O interface 805 as needed. A removable medium 811 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 810 as needed so that a computer program read out therefrom is mounted into the storage section 808 as needed. The processing unit 801 may be implemented as a processing unit such as CPU, GPU, TPU, FPGA, NPU.
In particular, according to embodiments of the present disclosure, the methods described above may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method described above. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section 809, and/or installed from the removable media 811.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units or modules referred to in the embodiments of the present disclosure may be implemented in software or in programmable hardware. The units or modules described may also be provided in a processor, the names of which in some cases do not constitute a limitation of the unit or module itself.
As another aspect, the present disclosure also provides a computer-readable storage medium, which may be a computer-readable storage medium included in the electronic device or the computer system in the above-described embodiments; or may be a computer-readable storage medium, alone, that is not assembled into a device. The computer-readable storage medium stores one or more programs for use by one or more processors in performing the methods described in the present disclosure.
The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the invention referred to in this disclosure is not limited to the specific combination of features described above, but encompasses other embodiments in which any combination of features described above or their equivalents is contemplated without departing from the inventive concepts described. Such as those described above, are mutually substituted with the technical features having similar functions disclosed in the present disclosure (but not limited thereto).
Claims (5)
1. A system for implementing signal coverage based on orbital angular momentum OAM, the system comprising:
the first modulation module is used for loading the data sent by the data channel of the cell onto an OAM carrier for modulation;
the second modulation module is used for loading the data sent by the control channel of the cell onto a non-OAM carrier wave for modulation; the non-OAM carrier wave is a plane wave;
wherein, first modulation module, second modulation module all includes: the first transmitting sub-module is used for transmitting the OAM signal which is loaded on the OAM carrier wave for modulation through the UCA array; the first emission sub-module includes: the adjusting unit is used for adjusting the field intensity ring radius or divergence angle of the multi-path signal loaded OAM carrier wave with different modes after the propagation distance z;
the adjusting unit includes:
a determining subunit, configured to determine a mode set U of OAM carriers in different modes;
the adjusting subunit is a phase shifting unit on the intelligent reflecting surface and is used for adjusting the field intensity ring radius of the OAM carriers in different modes in the mode set U to the preset field intensity ring radius by taking the preset field intensity ring radius as a reference; or adjusting the divergence angles of OAM carriers of different modes in the mode set U within a preset error range by taking a preset divergence angle as a reference;
the preset field intensity loop radius or the preset divergence angle is a specified value or is calculated according to the wavelength of an OAM carrier wave of one mode in the mode set U and the UCA array radius.
2. The system of claim 1, wherein the data transmitted by the control channel comprises: a data channel frequency point, a data channel OAM parameter set; the data channel OAM parameter set includes: and the OAM mode and the OAM transmission type are on the data channel frequency points.
3. The system according to claim 1 or 2, wherein the own cell and the neighboring cell are networked using OAM carriers of different modes, the frequencies of which are the same, different or have frequency intersections; and/or
When the signals which are loaded on the OAM carrier by the cell and modulated are multipath signals, the multipath signals adopt different OAM modes.
4. The system of claim 3, wherein the first modulation module and the second modulation module each further comprise:
and the second transmitting sub-module is used for transmitting the plane wave signal to the intelligent reflecting surface to obtain an OAM signal and transmitting the OAM signal on the OAM carrier.
5. The system of claim 4, wherein the smart reflective surface is a quasi-talbot effect surface on which N is disposed len A circular quasi-Talbot vortex phase unit, N len The round quasi-Talbot vortex phase units form positive N len A polygon with a center point of each circular quasi-talbot vortex phase unit at positive N len The vertex of the polygon;
and the second transmitting submodule uses the circular quasi-Talbot vortex phase unit to adjust the phase of the plane wave signal to obtain the OAM signal.
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| JP2019083475A (en) * | 2017-10-31 | 2019-05-30 | 日本電信電話株式会社 | OAM multiplex communication system and OAM multiplex communication method |
| CN111133698A (en) * | 2017-09-25 | 2020-05-08 | 日本电信电话株式会社 | OAM multiplex communication system and OAM multiplex communication method |
| CN112834980A (en) * | 2021-01-08 | 2021-05-25 | 北京理工大学 | Vortex electromagnetic wave super-resolution direction finding method based on propagation operator |
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| US9712273B2 (en) * | 2014-05-13 | 2017-07-18 | Zte Corporation | Orbital angular momentum multiplexing for digital communication |
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| CN111133698A (en) * | 2017-09-25 | 2020-05-08 | 日本电信电话株式会社 | OAM multiplex communication system and OAM multiplex communication method |
| JP2019083475A (en) * | 2017-10-31 | 2019-05-30 | 日本電信電話株式会社 | OAM multiplex communication system and OAM multiplex communication method |
| CN112834980A (en) * | 2021-01-08 | 2021-05-25 | 北京理工大学 | Vortex electromagnetic wave super-resolution direction finding method based on propagation operator |
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