CN114244446B - System, method and equipment for realizing signal coverage based on Orbital Angular Momentum (OAM) - Google Patents

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

Systems, methods and equipment for achieving signal coverage based on orbital angular momentum OAM

Technical field

The present disclosure relates to the technical field, and specifically relates to a system, method and device for achieving signal coverage based on orbital angular momentum OAM.

Background technique

Wireless communication based on Orbital Angular Momentum (OAM) is one of the hot topics in the field of communications recently. OAM waves have different vortex wave fronts, ring-shaped energy distribution, and strong directionality based on their angular quantum numbers. OAM waves with different angular quantum numbers (also called different modes) have integral orthogonality. That is to say, different modes of OAM waves can transmit different information in the same frequency domain, the same time domain, and the same space, thus greatly improving the capacity of the communication system. Currently, in the field of mobile wireless communications (microwave band), due to the lower frequency used in optical communications, the transmission and reception methods are more limited. Due to the characteristics of large number of terminals and mobility, there is less research on signal coverage methods.

Contents of the invention

In order to solve problems in related technologies, embodiments of the present disclosure provide a system, method and device for achieving signal coverage based on orbital angular momentum OAM.

In the first aspect, embodiments of the present disclosure provide a system for achieving signal coverage based on orbital angular momentum OAM.

Specifically, the system for achieving signal coverage based on orbital angular momentum OAM includes:

The first modulation module is used to load the data sent by the data channel of the cell onto the OAM carrier for modulation;

The second modulation module is used to load the data sent by the control channel of the cell onto the OAM carrier for modulation; or is used to load the data sent by the control channel of the cell onto the non-OAM carrier for modulation.

Optionally, the data sent by the control channel includes: data channel frequency point and 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 adjacent cells use different modes of OAM carrier networking, and the frequencies of the OAM carriers in different modes are the same, different, or have frequency intersection; and/or

When the signals loaded by the local cell onto the OAM carrier for modulation are multi-channel signals, the multi-channel signals adopt different OAM modes.

Optionally, the first modulation module and the second modulation module include:

The first transmitting sub-module is used to transmit the OAM signal loaded onto the OAM carrier and modulated through the UCA array; and/or

The second transmitting sub-module is used to transmit the plane wave signal to the smart reflective surface to obtain the OAM signal, and transmit the OAM signal on the OAM carrier.

Optionally, the first transmitting sub-module includes:

The adjustment unit is used to adjust the field strength ring radius or divergence angle after the propagation distance z of OAM carriers of different modes loaded with multi-channel signals.

Optionally, the adjustment unit includes:

Determining subunit, used to determine the mode set U of different modes of OAM carriers;

The adjustment subunit is used to adjust the field strength ring radius of the OAM carriers of different modes in the mode set U to the preset field strength ring radius based on the preset field strength ring radius; or use the preset divergence angle as Baseline, adjust the divergence angles of OAM carriers of different modes in the mode set U to be within the preset error range;

Wherein, the preset field strength ring radius or the preset divergence angle is a specified value or is calculated based on the wavelength of the OAM carrier of one mode in the mode set U and the UCA array radius.

Optionally, the modulation subunit is a phase shift unit on the smart reflective surface.

Optionally, the intelligent reflective surface is a quasi-Talbot effect surface, and Nlen circular quasi-Talbot vortex phase units are provided on the quasi-Talbot effect surface, and the Nlen circular quasi-Talbot vortex phase units are arranged on the quasi-Talbot effect surface. The quasi-Talbot vortex phase unit forms a regular Nlen polygon, and the center point of each circular quasi-Talbot vortex phase unit is at the vertex of the regular Nlen polygon;

The second transmitting sub-module uses the quasi-Talbot vortex phase unit to adjust the phase of the plane wave signal to obtain the OAM signal.

In the second aspect, embodiments of the present disclosure provide a method for achieving signal coverage based on orbital angular momentum OAM.

Specifically, the method for achieving signal coverage based on orbital angular momentum OAM includes:

Load the data sent by the data channel of this cell onto the OAM carrier for modulation;

Load the data sent by the control channel of this cell onto the OAM carrier for modulation; or load the data sent by the control channel of this cell onto the non-OAM carrier for modulation.

In a third aspect, embodiments of the present disclosure provide an electronic device including a memory and a processor, wherein the memory is used to store one or more computer instructions, and wherein the one or more computer instructions are processed by the The processor executes to implement the following method steps:

Load the data sent by the data channel of this cell onto the OAM carrier for modulation;

Load the data sent by the control channel of this cell onto the OAM carrier for modulation; or load the data sent by the control channel of this cell onto the non-OAM carrier for modulation.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

The system provided by the embodiments of the present disclosure to achieve signal coverage based on orbital angular momentum OAM selects corresponding modulation methods for the data sent by the data channel and the control channel. Considering that the data channel usually sends a large amount of data, such as audio and video data, and the advantages of OAM The purpose is to use different modes to achieve ultra-large bandwidth/extra-large access volume. Using OAM carriers for signal modulation can increase channel capacity, while the amount of data sent by the control channel is small. Therefore, the control channel can use non-OAM carrier modulation, and of course, it can also use OAM carriers. Modulation to achieve OAM signal coverage within the mobile network area.

It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and do not limit the present disclosure.

Description of drawings

Other features, objects and advantages of the present disclosure will become more apparent from the following detailed description of the non-limiting embodiments in conjunction with the accompanying drawings. In the attached picture:

Figure 1 shows a schematic structural diagram of a system for achieving signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure;

Figure 2 shows a schematic diagram of the OAM field strength distribution and phase distribution with an OAM mode of 1 and a circular quasi-Talbot vortex phase unit number of 6;

Figure 3 shows a schematic diagram of the relationship between the coverage radius, the number of sub-rings and the transmission distance forming the OAM signal coverage area;

Figure 4 shows a schematic diagram of the change in the receiver radius of the OAM signal discovered using the quasi-Talbot effect surface to transmit the OAM signal compared to the UCA array antenna;

Figure 5 shows a schematic diagram of the principle of forming an OAM signal coverage area;

Figure 6 shows a flow chart of a method for achieving signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure;

Figure 7 shows a structural block diagram of an electronic device according to an embodiment of the present disclosure;

FIG. 8 shows a schematic structural diagram of a computer system suitable for implementing a method for achieving signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure.

Detailed ways

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. Furthermore, for clarity, parts irrelevant to describing the exemplary embodiments are omitted in the drawings.

In this disclosure, it should be understood that terms such as "comprising" or "having" 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 a or the possibility that multiple other features, numbers, steps, acts, parts, portions, or combinations thereof may exist or be added.

In addition, it should be noted that the embodiments and features in the embodiments of the present disclosure can be combined with each other as long as there is no conflict. The present disclosure will be described in detail below in conjunction with embodiments with reference to the accompanying drawings.

Currently, in the field of mobile wireless communications (microwave band), due to the lower frequency used in optical communications, the transmission and reception methods are more limited. Due to the characteristics of large number of terminals and mobility, there is less research on signal coverage methods.

The present disclosure is made to address, at least in part, problems in the prior art identified by the inventors.

Figure 1 shows a schematic structural diagram of a system for realizing 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 realizing signal coverage based on orbital angular momentum (OAM) includes: a first modulation module 110 and a second modulation module 120 . The first modulation module 110 is used to load the data sent by the data channel of the cell onto the OAM carrier for modulation. The second modulation module 120 is used to load the data sent by the control channel of the local cell onto the OAM carrier for modulation; or is used to load the data sent by the control channel of the local cell onto the non-OAM carrier for modulation.

The system provided by this disclosure to achieve signal coverage based on orbital angular momentum OAM selects the corresponding modulation method for the data sent by the data channel and the control channel. Considering that the data channel usually sends a large amount of data, such as audio and video data, and the advantage of OAM is to use Different modes achieve ultra-large bandwidth/extra-large access volume. Using OAM carriers for signal modulation can increase channel capacity, while the amount of data sent by the control channel is small. Therefore, using non-OAM carrier modulation for the control channel can reduce the channel overhead during the terminal's reception of control channel information. Estimation complexity, reception difficulty, and can assist channel estimation of data channels using OAM carriers. In this method, the non-OAM carrier wave may be a plane wave or other waveform. Those skilled in the art can understand that the data sent by the control channel can also be modulated using OAM carriers, and this disclosure does not limit this.

According to an embodiment of the present disclosure, the data sent by the control channel includes: data channel frequency point, data channel OAM parameter set; the data channel OAM parameter set includes: OAM mode, OAM transmission on the data channel frequency point type. Among them, the OAM modes are different OAM modes of orbital angular momentum, represented by the mode number l, and the electromagnetic vortex waves of different mode numbers l are orthogonal to each other. This OAM-based multiplexing can potentially increase the system capacity and spectral efficiency of wireless communication links without relying on traditional resources such as time and frequency. The OAM mode adopted on the data channel frequency point may be single mode (same number of modes) or mixed mode (different mode numbers), and this disclosure does not limit this. The OAM emission type may be one or more of Uniform Circular Array (UCA) emission or UCA-like emission or optical emission.

According to embodiments of the present disclosure, the system for realizing signal coverage based on orbital angular momentum OAM provided by the present disclosure is applied to mobile network communication scenarios. In this scenario, the current cell and adjacent cells adopt different modes of OAM carrier networking. The difference Inter-frequency networking can improve system capacity while avoiding signal interference between cells. Specifically, for example, if the number of OAM carrier modes adopted by this cell is l=1, then the neighboring cells can adopt l=2; or for example, if the number of modes used by this cell with OAM carriers is l=1 and l=2, then the neighboring cells can adopt l=1 and l=2. l=3, l=4 can be used. That is, regardless of whether the current cell uses single-mode or mixed-mode OAM carriers, adjacent cells only need to select different mode numbers. This cell and adjacent cells use different modes of OAM carrier networking. There is no requirement for the frequencies of the OAM carriers in different modes. They can be the same, different, or have frequency intersections, which can avoid signal interference between cells.

According to embodiments of the present disclosure, for the local cell, when the signals loaded by the local cell onto the OAM carrier for modulation are multi-channel signals, the multi-channel signals adopt different OAM modes to achieve multi-channel signals. Simultaneous transmission to avoid interference between multiple signals in this cell. It can be understood that the multi-channel signals in this cell can also adopt different OAM modes, and the frequency of the OAM carrier can be changed accordingly. This disclosure does not limit this.

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 used to transmit the modulated OAM signal loaded on the OAM carrier through the UCA array; the second transmitting sub-module 112 is used to transmit the plane wave signal to the smart reflective surface to obtain the OAM signal, and then The OAM signal is transmitted on the OAM carrier.

This disclosed method provides two implementation methods for transmitting data sent by a data channel as an OAM signal. One method is to directly use the UCA array to generate an OAM carrier, and load the data to be sent onto the OAM carrier for transmission. The other method is It is through an Intelligent Reflecting Surface (IRS), also known as an intelligent metasurface or a Reconfigurable Intelligent Surface (RIS). The IRS performs phase processing on the received plane wave signal and reflects it to form an OAM signal. The second transmitting sub-module 12 can adjust the phase parameters of the IRS to obtain the OAM signal, and then transmit the OAM signal on the OAM carrier.

It can be understood that the second modulation module 120 may also include a first transmitting sub-module 111 and/or a second transmitting sub-module 112 to modulate the data sent by the control channel into an OAM signal for transmission.

The following further explains the solution for the receiver to receive all modes with a single UCA antenna when the multi-channel signals in this cell use different OAM modes.

The inventor found that the purpose of transmitting mixed-mode OAM beams is to perform OAM multiplexing, improve spectrum utilization, and combat Gaussian noise interference. Since the divergence angles of different modes are different at the same frequency and UCA transmission radius, it is difficult for the receiver to use a single UCA antenna to receive all modes after a certain transmission distance. By adjusting the UCA transmitting antenna parameters, the field strength loop radius of the transmitted mixed-mode OAM is the same, thereby achieving the purpose of the receiver receiving all modes with a single UCA antenna.

Let U be the set of OAM modes that need to be launched, then l(u)∈U is a point in the spherical coordinate system The electric field at can be approximated as:

Among them, r is the radial distance in the spherical coordinate system, is the azimuth angle in the spherical coordinate system, θ is the divergence angle, that is, the elevation angle in the spherical coordinate system, N is the number of antenna elements,/> is the wave vector, λ is the wavelength, l is the mode number, a is the radius of the emission array,/> is the integral variable, and J _l is the Bessel function of order l. It can be seen from this that if the field strength ring radius of the defined mode is the maximum value of the halo intensity, then the longer the wavelength λ, the lower the frequency, and the smaller the emission array radius a, the larger the OAM field strength ring radius will be at the same position, that is, The larger the divergence angle θ is. The relationship between the field strength ring radius r _coord and the divergence angle θ _coord after the OAM signal propagates distance z is: When transmitting OAM carriers of multiple modes in U, the product of frequency and array radius (i.e. ka) can be adjusted so that the maximum value of l(u)∈U-order Bessel function is close to a certain extent. U-mode OAM Although the field strength distribution of the ring is not ring-shaped, the field strength of each mode component is still ring-shaped and the radius is approximately the same. This allows the receiving end (such as a circular antenna array with a certain area) to receive multiple signals at the same spatial location. Main lobe information of the module.

Specifically, the first transmitting sub-module 111 includes: a modulation unit. The adjustment unit is used to adjust the field strength ring radius or divergence angle after the propagation distance z of OAM carriers of different modes loaded by multi-channel signals.

According to an embodiment of the present disclosure, the adjustment unit includes: a determining subunit and an adjusting subunit. The determination subunit is used to determine the mode set U of OAM carriers of different modes; the adjustment subunit is used to adjust the field strength ring radius of the OAM carriers of different modes in the mode set U to the desired value based on the preset field strength ring radius. The preset field strength ring radius; or based on the preset divergence angle, adjust the divergence angles of the OAM carriers of different modes in the mode set U to be within the preset error range; wherein the preset field strength ring radius or The preset divergence angle is a specified value or is calculated based on the wavelength of the OAM carrier of one mode in the mode set U and the radius of the UCA array.

In this disclosed method, the adjustment subunit can use two methods to adjust the field strength ring radius or divergence angle after the propagation distance z of OAM carriers of different modes loaded by multi-channel signals.

One way is to preset the field strength ring radius as the field strength ring radius after the OAM signal propagation distance z required by the receiver, so as to adjust the field strength ring radius after the propagation distance z of the OAM carriers of different modes to be the same; or use the preset The divergence angle is the reference value. The preset divergence angle is the divergence angle of the OAM signal required by the receiver after the propagation distance z. The divergence angle after adjusting the propagation distance z of the OAM carriers of different modes with the reference value is within the preset error range, that is, within θ′ _coord = (1±Δσ)θ _coord Find a feasible solution to the following formula:

Among them, Δσ is the preset error. The solution process of the above formula can be completed by general advanced mathematical methods or by numerical simulation software.

Another way is to calculate the preset field strength ring radius based on the wavelength λ ₀ of the OAM carrier of one mode in the mode set U and the UCA array radius a ₀ , and adjust the propagation distance of the OAM carriers of other modes in the mode set U The field strength ring radius after z is the same as the preset field strength ring radius.

Specifically, the following formula is used:

Among them, abs() means finding the absolute value, The solution process of θ corresponding to the maximum value can be completed by general advanced mathematical methods or numerical simulation software, and will not be described in detail here. Alternatively, the divergence angle obtained by solving the problem is used as the preset divergence angle. Based on this, the divergence angle after adjusting the OAM carrier propagation distance z of other modes in the mode set U is within the preset error range.

There is a continuous solution space for the above two methods, that is, there can be infinite discrete feasible solutions. However, in practical applications, there are practical limitations on the frequency bands and frequency points available for the modulation unit and the radius available for the UCA antenna array, so you can choose among them. Available, reasonable solutions. It should be noted that by adjusting the unit to coordinate the divergence angles of each mode to θ _coord (or approximately θ _coord ), the above solution results have nothing to do with z (or almost nothing).

According to embodiments of the present disclosure, the modulation subunit can be implemented by a large-scale antenna array, that is, antennas at different positions in the large-scale array are used and antenna phases are applied accordingly.

According to an embodiment of the present disclosure, the modulation subunit is a phase shift unit on a smart reflective surface. The adjustment of the UCA array radius can be realized by RIS, that is, by adjusting the phase shift amount of the phase shift unit on the RIS.

According to an embodiment of the present disclosure, the smart reflective surface is a quasi-Talbot effect surface, and N _len circular quasi-Talbot vortex phase units are provided on the quasi-Talbot effect surface, so Said N _len circular quasi-Talbot vortex phase units form a positive N _len polygon, and the center point of each circular quasi-Talbot vortex phase unit (hereinafter referred to as the phase unit) is on the positive N _len side on the vertex of the shape;

The second transmitting sub-module uses the quasi-Talbot vortex phase unit to adjust the phase of the plane wave signal to obtain the OAM signal.

For the scenario where the receiver is a mobile terminal, considering that a set of UCA antennas can only achieve coverage of one ring area, the use of quasi-Talbot effect surface can achieve a large number of ring coverage in the coverage area (depending on factors such as the coverage area area). This achieves comprehensive OAM signal coverage in a certain area and ensures that the receiver can receive OAM signals in a certain area.

Define the radius of the circumscribed circle of the regular N _len polygon as d, establish an xy plane coordinate system, the coordinate origin is at the geometric center of the regular N _len polygon, and the coordinates of each phase unit are expressed as (x _{cent, n} , y _{cent, n} ) , the change of the current phase of the nth phase unit to the signal reaching the phase plane is to superimpose a vortex phase and a spherical phase on it:

At point (x, y) on the effect surface phase unit, when a single mode is emitted,

Among them, φ _n is the phase shift of the phase unit, l is the number of modes, λ is the wavelength,/> is the azimuth angle of the nth phase unit, if there are N _len phase units/> z _target is the distance from a surface parallel to the effect surface (the focal plane of the lens on the quasi-Talbot effect surface) to the effect surface.

The OAM generated by the quasi-Talbot effect has UCA-like properties and cannot emit modes with a mode number greater than or equal to N _len /2. To emit multiple modes, the distance between the OAM coverage area and the effect surface must be at least (4-2*sin(2*π/N _len /2))*Z _target . For example, at least N _len =6 is required to emit l=1 , l=2 mixed mode, that is, positions smaller than 3Z _target cannot obtain OAM signal coverage, and positions larger than 3Z _target can obtain OAM signal coverage. The coverage range is related to Z _target , d, frequency, and transmit array radius. It should be noted that the above formula only includes the phase distribution in the phase unit. At the position of the non-phase unit on the effect surface, the signal reaching the surface is not transmitted (that is, the signal there is shielded).

At point (x, y) on the effect surface phase unit, when emitting mixed modes, just add the phases of each mode,

Therefore, the field strength at point (x, y, z _target +D) is:

Among them, D is the distance from the focal plane of the lens on the quasi-Talbot effect surface;

That is to say, it has densely distributed OAM ring field coverage, and the coverage area radius R is generally less than d. The schematic diagram is shown in Figures 2 and 3. As the transmission distance increases, the change of the coverage area radius is basically stable at 0.8-0.9d. . The number of radial sub-rings in the coverage area changes with distance, which directly reflects changes in the maximum number of receivers that can be accommodated in the coverage area and changes in resource utilization.

Since OAM receivers generally need to receive the entire OAM ring, the above method can greatly reduce the size of the receiver. Depending on the frequency band, modulus, distance, and vortex phase plane size, compared with UCA transmission, it has up to 45% The radius decreases. As shown in Figure 4, the quasi-Talbot effect can reduce the size of the receiver compared to traditional UCA, and can reduce the radius by nearly 48% after propagating z=15*d distance.

Figure 5 shows a schematic diagram of the principle of forming an OAM signal coverage area. As shown in Figure 5, the wireless signal emitted by the base station is a plane wave signal. The phase parameters of the quasi-Talbot effect surface are adjusted in real time according to the coverage requirements such as orientation, distance, and frequency band, and the plane wave signal is sent to the quasi-Talbot vortex. The effect surface forms the OAM signal coverage area. Within the OAM signal coverage area, the receiver can receive the OAM signal. Although the OAM signal coverage area generated by the above method does not require the center of the receiver to be aligned with the center of the quasi-Talbot effect plane, it still needs the normal direction to be parallel to the normal direction of the plane where the receiver is located to obtain the best reception effect.

According to embodiments of the present disclosure, the quasi-Talbot vortex effect surface can be realized by an intelligent reflective surface IRS or called a reconfigurable intelligent surface RIS, that is: the phase shift element on the RIS can change the wavefront phase of the received signal according to the above Adjusted using the quasi-Talbot principle, each φ _n can be achieved by adjusting the reflection path length or controlling the signal reflection delay.

The phase shift distribution formula of the phase shift element on the RIS is:

Among them, k=2π/wavelength is the wave vector; ( _xi , y _i ) are the coordinates of the phase shift element. (x _n , y _n ) are the coordinates of the center position of each lens in the Talbot effect, and f _n is the focal length of each lens in the quasi-Talbot effect.

FIG. 6 shows a flowchart of a method for achieving signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure. As shown in Figure 6, the method for achieving signal coverage based on orbital angular momentum OAM includes steps S601 to S602.

In step S601, the data sent by the data channel of the cell is loaded onto the OAM carrier for modulation;

In step S602, the data sent by the control channel of the current cell is loaded onto the OAM carrier for modulation; or the data sent by the control channel of the local cell is loaded onto the non-OAM carrier for modulation.

For specific technical details of the embodiments of the present disclosure, please refer to the corresponding technical content of the above-mentioned accompanying drawings 1-5, and will not be described again here.

According to an embodiment of the present disclosure, the data sent by the control channel includes: data channel frequency point, data channel OAM parameter set; the data channel OAM parameter set includes: OAM mode, OAM transmission on the data channel frequency point type.

According to an embodiment of the present disclosure, the local cell and adjacent cells use different modes of OAM carrier networking, and the frequencies of the OAM carriers in different modes are the same, different, or have frequency intersection; and/or

When the signals loaded by the local cell onto the OAM carrier for modulation are multi-channel signals, the multi-channel signals adopt different OAM modes.

According to an embodiment of the present disclosure, the method further includes:

The OAM signal loaded onto the OAM carrier and modulated is transmitted through the UCA array; and/or

The plane wave signal is transmitted to the smart reflecting surface to obtain an OAM signal, and the OAM signal is transmitted on the OAM carrier.

According to an embodiment of the present disclosure, the method further includes:

Adjust the field strength ring radius or divergence angle after the propagation distance z of different modes of OAM carriers loaded with multi-channel signals.

According to an embodiment of the present disclosure, the adjustment of the field strength ring radius or divergence angle after the propagation distance z of OAM carriers of different modes loaded by multi-channel signals includes:

Determine the mode set U of different modes of OAM carriers;

Based on the preset field strength ring radius, adjust the field strength ring radius of the OAM carriers of different modes in the mode set U to the preset field strength ring radius; or adjust the mode based on the preset divergence angle. The divergence angles of different modes of OAM carriers in set U are within the preset error range;

Wherein, the preset field strength ring radius or the preset divergence angle is a specified value or is calculated based on the wavelength of the OAM carrier of one mode in the mode set U and the UCA array radius.

According to an embodiment of the present disclosure, the OAM signal is obtained after adjusting the phase of the plane wave signal using the quasi-Talbot vortex phase unit; wherein the smart reflective surface is a quasi-Talbot effect surface, and N _len circular quasi-Talbot vortex phase units are provided on the quasi-Talbot effect surface, and the N _len circular quasi-Talbot vortex phase units form a regular N _len polygon, And the center point of each circular quasi-Talbot vortex phase unit is at the vertex of the regular N _len polygon.

The present disclosure also discloses an electronic device, and FIG. 7 shows a structural block diagram of the electronic device according to an embodiment of the present disclosure.

As shown in Figure 7, the electronic device 700 includes a memory 701 and a processor 702; wherein,

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 following method steps:

Load the data sent by the data channel of this cell onto the OAM carrier for modulation;

Load the data sent by the control channel of this cell onto the OAM carrier for modulation; or load the data sent by the control channel of this cell onto the non-OAM carrier for modulation.

According to an embodiment of the present disclosure, the data sent by the control channel includes: data channel frequency point, data channel OAM parameter set; the data channel OAM parameter set includes: OAM mode, OAM transmission on the data channel frequency point type.

According to an embodiment of the present disclosure, the local cell and adjacent cells use different modes of OAM carrier networking, and the frequencies of the OAM carriers in different modes are the same, different, or have frequency intersection; and/or

When the signals loaded by the local cell onto the OAM carrier for modulation are multi-channel signals, the multi-channel 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 implement the following method steps:

The OAM signal loaded onto the OAM carrier and modulated is transmitted through the UCA array; and/or

The plane wave signal is transmitted to the smart reflecting surface to obtain an OAM signal, and the OAM signal is transmitted on the OAM carrier.

According to an embodiment of the present disclosure, the one or more computer instructions are executed by the processor to implement the following method steps:

Adjust the field strength ring radius or divergence angle after the propagation distance z of different modes of OAM carriers loaded with multi-channel signals.

According to an embodiment of the present disclosure, the adjustment of the field strength ring radius or divergence angle after the propagation distance z of OAM carriers of different modes loaded by multi-channel signals includes:

Determine the mode set U of different modes of OAM carriers;

Based on the preset field strength ring radius, adjust the field strength ring radius of the OAM carriers of different modes in the mode set U to the preset field strength ring radius; or adjust the mode based on the preset divergence angle. The divergence angles of different modes of OAM carriers in set U are within the preset error range;

Wherein, the preset field strength ring radius or the preset divergence angle is a specified value or is calculated based on the wavelength of the OAM carrier of one mode in the mode set U and the UCA array radius.

According to an embodiment of the present disclosure, the OAM signal is obtained after adjusting the phase of the plane wave signal using the quasi-Talbot vortex phase unit; wherein the smart reflective surface is a quasi-Talbot effect surface, and N _len circular quasi-Talbot vortex phase units are provided on the quasi-Talbot effect surface, and the N _len circular quasi-Talbot vortex phase units form a regular N _len polygon, And the center point of each circular quasi-Talbot vortex phase unit is at the vertex of the regular N _len polygon.

FIG. 8 shows a schematic structural diagram of a computer system suitable for implementing a method for achieving signal coverage based on orbital angular momentum OAM according to an embodiment of the present disclosure.

As shown in FIG. 8 , computer system 800 includes a processing unit (CPU) 801 that can operate in accordance with a program stored in a read-only memory (ROM) 802 or loaded from a storage portion 808 into a random access memory (RAM) 803 Various processes in the above-described embodiment are performed. In the RAM 803, various programs and data required for the operation of the system 800 are also stored. CPU801, ROM802 and RAM803 are connected to each other through bus 804. An input/output (I/O) interface 805 is also connected to bus 804.

The following components are connected to the I/O interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., speakers, etc.; and a storage section 808 including a hard disk, etc. ; and a communication section 809 including a network interface card such as a LAN card, a modem, etc. The communication section 809 performs communication processing via a network such as the Internet. Driver 810 is also connected to I/O interface 805 as needed. Removable media 811, such as magnetic disks, optical disks, magneto-optical disks, semiconductor memories, etc., are installed on the drive 810 as needed, so that a computer program read therefrom is installed into the storage portion 808 as needed. Wherein, the processing unit 801 can be implemented as a processing unit such as CPU, GPU, TPU, FPGA, NPU, etc.

In particular, according to embodiments of the present disclosure, the method described above may be implemented as a computer software program. For example, embodiments of the present disclosure include a computer program product including a computer program tangibly embodied on a machine-readable medium, the computer program including program code for performing the above-described method. In such embodiments, the computer program may be downloaded and installed from the network via communications portion 809 and/or installed from removable media 811 .

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operations 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 that contains one or more components for implementing the specified logical function(s). Executable instructions. 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 one after another may actually execute substantially in parallel, or they may sometimes execute in the reverse order, depending on the functionality involved. It will also be noted that each block of the block diagram and/or flowchart illustration, and combinations of blocks in the block diagram and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or operations. , or can be implemented using a combination of specialized hardware and computer instructions.

The units or modules described in the embodiments of the present disclosure may be implemented in software or programmable hardware. The described units or modules may also be provided in the processor, and the names of these units or modules do not constitute a limitation on the units or modules themselves under certain circumstances.

As another aspect, the present disclosure also provides a computer-readable storage medium. The computer-readable storage medium may be the computer-readable storage medium included in the electronic device or computer system in the above embodiments; it may also exist independently. , a computer-readable storage medium that is not installed in the device. The computer-readable storage medium stores one or more programs, which are used by one or more processors to perform the methods described in the present disclosure.

The above description is only a description of the preferred embodiments of the present disclosure and the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present disclosure is not limited to technical solutions formed by a specific combination of the above technical features, but should also cover any combination of the above technical features without departing from the concept of the invention. or other technical solutions formed by any combination of equivalent features. For example, a technical solution is formed by replacing the above features with technical features with similar functions disclosed in this disclosure (but not limited to).

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.