KR101857856B1

KR101857856B1 - Method for oam multi-mode transmission by rf lens antenna

Info

Publication number: KR101857856B1
Application number: KR1020160009591A
Authority: KR
Inventors: 강준혁; 정승재
Original assignee: 한국과학기술원
Priority date: 2015-12-15
Filing date: 2016-01-26
Publication date: 2018-05-15
Also published as: KR20170071385A

Abstract

An Orbital Angular Momentum (OAM) multimode transmission method using an RF (Radio Frequency) lens antenna is disclosed. A transmitting apparatus using an OAM according to an exemplary embodiment includes a transmitting UCA (Uniform Circular Array) including N antenna elements and generating N OAM multi-modes through the antenna elements; And a transmission RF lens antenna for suppressing the spread of radio waves according to the OAM multi-mode.

Description

METHOD FOR OAM MULTI-MODE TRANSMISSION BY RF LENS ANTENNA USING THE RF LENS ANTENNA

The following embodiments relate to an Orbital Angular Momentum (OAM) multimode transmission method.

Conventional communication systems are classified into FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), CDMA (Code Division Multiple Access), MIMO (Multi-Input and Multi-Output) Such as frequency, time, code dimension, and spatial domain. However, in such an existing communication system, since the available resources are limited as the number of users and the required transmission capacity increase, the efficiency decreases, and accordingly, a communication resource of a new domain is searched Became very important. In accordance with this trend, research on a communication system using OAM (Orbital Angular Momentum) initiated in optical communication has received attention.

The angular momentum is a physical quantity that is preserved in time and space for rotating materials. In particular, OAM is expressed as a quantized integer form, which is called a mode in which electromagnetic waves propagate in a spiral form. Since the modes are orthogonal to each other, they are available for independent data stream transmission. In optical communications, research has been carried out that the transmission capacity can be increased from several times to several tens times depending on the number of modes, and studies are underway to apply it to an RF (Radio Frequency) band. Unlike the existing MIMO technology, the multi-mode transmission technique using the OAM of the electromagnetic wave in the RF band can constitute an independent channel in the Lo-S (Line-of-Sight) channel environment, thereby increasing the spectral efficiency and transmission capacity .

This multi-mode generation technique can be applied to a near-5G small-sized cell and a wireless backhaul in a LoS channel environment which requires a large capacity transmission. However, in the conventional OAM multi-mode transmission technique of the RF band, there is a problem that the attenuation of the signal according to the distance is large in a general wireless communication environment. Accordingly, there is a disadvantage that the transmission distance is short, and the present invention attempts to solve this problem through the RF lens antenna.

The OAM transmission technique in the RF band has the advantage that the transmission efficiency can be increased according to the number of modes, but there is a disadvantage that the transmission distance in which actual communication is possible is short because of the large signal attenuation depending on the distance. SUMMARY OF THE INVENTION It is an object of the present invention to provide an OAM multi-mode transmission method using an RF lens antenna to solve the problem of signal attenuation depending on distances.

1 is a diagram for explaining a process of generating and receiving an OAM multi-mode in optical communication. In the case of optical communication, as shown in FIG. 1, an OAM mode is generated through an SLM (Spatial Light Modulator) using the principle of HP (Holographic Plate), and is transmitted along an optical fiber close to an ideal channel through a laser beam or light. The beam dispersion is very small compared to the RF band.

FIG. 2 is a diagram illustrating a UCA structure for generating an OAM multi-mode in an RF band and a beam shape for each mode. OAM multi-mode transmission in the RF band is performed through a UCA (Uniform Circular Array) and a DFT (Discrete Fourier Transform) composed of N elements as shown in FIG. 2. In a wireless communication channel, it is not an ideal AWGN channel like optical communication , Since the carrier frequency is smaller than that of optical communication, the directivity decreases and the radio waves spread all over the place. The mode is radiated from the transmitter in the form of a cone, and the degree of spread increases as the mode is increased. However, since the antenna radius of the receiving unit is limited, the intensity of the received signal decreases as the mode is higher. FIG. 3 is a graph showing the attenuation rate according to the distance due to the OAM multi-mode characteristic in the RF band of FIG. 2. FIG. Referring to FIG. 3, it can be seen that the higher the mode is, the higher the attenuation ratio is with respect to the distance.

According to one aspect, a transmitting apparatus using an Orbital Angular Momentum (OAM) includes: a transmitting UCA (Uniform Circular Array) including N antenna elements and generating N OAM multi-modes through the antenna elements; And a transmission RF (Radio Frequency) lens antenna for suppressing the spread of a radio wave according to the OAM multi-mode.

The OAM multi-mode radio wave may be received through the receiving RF lens antenna of the receiving apparatus, and the transmitting RF lens antenna may collect the OAM multi-mode radio wave within the radius of the receiving RF lens antenna. The radio waves according to the OAM multi-mode radiate in a conical shape, and the higher the mode, the greater the degree of spread.

The transmission apparatus includes a transmission processing unit for transforming a stream vector of NX1 to be transmitted into a transmission signal of NX1 through a DFT (Discrete Fourier Transform) matrix of NXN; And a divider for allocating the transmission signal of NX1 to the N antenna elements. The transmit RF lens antenna may be divisible into a plurality of circular regions corresponding to the type of the transmitted UCA.

The propagation according to the OAM multi-mode may be transmitted over a transmission channel, wherein the transmission channel includes a first channel between the transmitting UCA and the transmitting RF lens antenna, a second channel between the transmitting RF lens antenna and the receiving RF lens antenna, Channel and a third channel between the receiving RF lens antenna and the receiving UCA. The components constituting the first channel, the second channel, and the third channel may have a property of being dependent only on the distance, and the transmission channel may be expressed by a circulation matrix.

According to one aspect, a transmission method using an Orbital Angular Momentum (OAM) includes generating N OAM multi-modes through N antenna elements included in a transmission UCA (Uniform Circular Array); And transmitting a radio wave according to the OAM multi-mode through a transmission RF (Radio Frequency) lens antenna, wherein propagation of the OAM multi-mode is suppressed by the transmission RF lens antenna.

The OAM multi-mode radio wave may be received through the receiving RF lens antenna of the receiving apparatus, and the transmitting RF lens antenna may collect the OAM multi-mode radio wave within the radius of the receiving RF lens antenna. The components constituting the transmission channel between the transmission RF lens antenna and the reception RF lens antenna may have a property of being dependent only on the distance, and the transmission channel may be expressed by a circulation matrix.

A receiving apparatus using an OAM (Orbital Angular Momentum) according to one side includes a receiving RF (Radio Frequency) lens antenna that collects radio waves according to N OAM multi-modes according to a receiving UCA (Uniform Circular Array); And a receiving UCA that includes N antenna elements and receives radio waves according to the OAM multi-mode through the antenna elements.

The radio waves according to the OAM multi-mode radiate in a conical shape, and the higher the mode, the greater the degree of spread. The receiver comprising: an assembler for receiving a received signal of NX1 from the N antenna elements; And a reception processor for converting the received signal of NX1 into a stream vector of NX1 of NX1 through an Inverse Discrete Fourier Transform (IDFT) matrix of NXN.

The receiving RF lens antenna may be divisible into a plurality of circular regions corresponding to the type of the receiving UCA. The propagation according to the OAM multi-mode may be transmitted through a transmission channel, wherein the transmission channel includes a first channel between a transmitting UCA and a transmitting RF lens antenna, a second channel between the transmitting RF lens antenna and the receiving RF lens antenna, And a third channel between the receiving RF lens antenna and the receiving UCA. The components constituting the first channel, the second channel, and the third channel have properties that depend only on the distance, and the transmission channel can be expressed by a circulation matrix.

A receiving method using an Orbital Angular Momentum (OAM) according to one side includes: collecting radio waves according to N OAM multi-modes through a receiving RF (Radio Frequency) lens antenna according to a receiving UCA (Uniform Circular Array); And receiving radio waves according to the OAM multi-mode through N antenna elements included in the reception UCA.

The components constituting the transmission channel between the transmission RF lens antenna and the reception RF lens antenna have a property that they depend only on the distance and the transmission channel can be represented by a circulation matrix.

The present invention is intended to prevent attenuation of signals due to distances due to the characteristics of radio waves spreading in all directions in the RF band and the characteristics of OAM multimode that spreads to higher modes. The OAM mode radiates in a conical shape, with higher modes spreading with larger radii. Therefore, when the receiver has a limited antenna radius, the received power of the high mode is reduced. In order to solve this problem, the RF lens antenna is used to collect the radio waves of high mode spreading in all directions to the radius of the antenna of the receiver, thereby increasing the reception power of the high mode, thereby increasing the transmission distance of the OAM multi-mode.

The present invention can be applied to a wireless backhaul which requires a high data rate in the mmWave band, and is particularly applicable in a LoS environment.

1 is a diagram for explaining a process of generating and receiving an OAM multi-mode in optical communication;
2 shows a UCA structure for generating an OAM multi-mode in an RF band and a form of a beam emitted by each mode.
FIG. 3 is a graph showing the attenuation rate with distance according to the OAM multi-mode characteristic in the RF band of FIG. 2;
4 illustrates an OAM multimode transmission system comprising an RF lens antenna and a UCA according to one embodiment.
FIG. 5 illustrates a process of dividing an RF lens antenna according to an embodiment; FIG.
6 illustrates a circular ring corresponding to a UCA in an RF lens antenna according to one embodiment;
7 illustrates a communication system using an OAM according to one embodiment.
8 is an operational flow diagram illustrating a transmission method using an OAM according to an embodiment;
9 is a flowchart illustrating an operation method using a OAM according to an embodiment.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. However, it is not intended to limit the embodiments according to the concepts of the present invention to the specific disclosure forms, but includes changes, equivalents, or alternatives falling within the spirit and scope of the present invention.

The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, for example, "between" and "immediately" or "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms " comprises " or " having ", and the like, are used to specify one or more of the features, numbers, steps, operations, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

The communication apparatus of the present invention includes an UCA for generating NAM antenna elements for generating an OAM multi-mode, and an RF lens antenna for collecting a spread of a beam according to OAM multi-mode transmission. The RF lens antenna serves to collect radio waves spreading in all directions, and the transmitting apparatus generates N OAM multi-modes equal to the number of antenna elements through the DFT matrix and the UCA. The receiving device restores the original signal through an IDFT (Inverse DFT (IDFT)).

The present invention provides an OAM multimode transmission method using an RF lens antenna to increase the transmission distance by expressing that the same OAM multi-mode transmission is possible through the RF lens antenna.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

4 is a diagram illustrating an OAM multi-mode transmission system including an RF lens antenna and a UCA according to an exemplary embodiment of the present invention. 4, the transmitting unit 410 includes a transmitting UCA including N antenna elements and an RF lens antenna for collecting the spread radio waves into the receiving UCA radius. The receiving unit 420 includes N antenna elements Lt; RTI ID = 0.0 > UCA < / RTI > and a receiving RF lens antenna. N number of OAM multi-modes can be generated in the same manner as the number of antenna elements. The following shows that the OAM multi-mode can be generated and restored through the DFT and IDFT matrices in the UCA as in the case of not using the RF lens antenna through the RF lens antenna.

In this system, the MIMO channel from the transmitting UCA to the receiving UCA is a channel from the transmitting UCA to the transmitting RF lens antenna in consideration of the transmitting RF lens antenna and the receiving RF lens antenna.

And a channel from the transmitting RF lens antenna to the receiving RF lens antenna

And a channel from the receiving RF lens antenna to the receiving UCA

And can be expressed as Equation (1) through these.

5 and 6, the region of the RF lens antenna can be divided into a circular region having a very small thickness in consideration of the shape of the UCA. K total circles with respect to the total area L are expressed by the following equation (2).

here

and

Lt; RTI ID = 0.0 > RF <

Th, receiving RF lens antenna

And for the convenience of calculation, the area of the transmitting and receiving lens antennas

and

The

. The circular ring portion can be thought of as a portion that matches each portion of the transmitting UCA as shown in FIG. 6, and can be considered as a new UCA portion allocated to the transmitting and receiving UCA on the RF lens antenna.

At this time, the MIMO channel

Can be expressed by the sum of the channels of the circular rings of the transmitting and receiving UCA and the transmitting and receiving RF lens antennas, respectively, as shown in Equation (3), taking into account the respective circular rings considered as Equation (2) and virtual UCA.

here

Is transmitted from the transmitting UCA to the transmitting RF lens antenna

The ring-

Channel, < / RTI >

Lt; RTI ID = 0.0 >

The ring-

From Receiving RF Lens Antenna

The ring-

Channel, < / RTI >

Of the receiving RF lens antenna

The ring-

To the receiving UCA.

Now each channel

The distance from the nth antenna element on the transmitting UCA to the mth antenna element of the receiving UCA

The channel value on the free space according to Equation (4)

here

Is expressed by the following equation (5).

here

Wow

Denotes the distance between the UCA, the radius of each of the n-th antenna element on the transmitting UCA and the m-th antenna element of the receiving UCA,

to be. In case of performing OAM multimode through UCA and DFT without lens antenna, channel matrix generated by UCA depends on distance only, so channel matrix has circulant property. Also, the circulant matrix is a DFT matrix

Eigenvalue decomposition by Eq. (6) is possible.

In the following description, it can be seen that an RF lens antenna can be decomposed into an eigenvalue decomposition through a DFT matrix as in Equation (6), thereby generating and restoring an OAM multi-mode.

Each channel

Are dependent only on the distance and the antenna element according to Equation (4) and Equation (5).

Are all dependent only on the distance,

, And each distance

Is expressed by Equation (7) based on Equation (5).

here

Lt; RTI ID = 0.0 > UCA < / RTI >

The distance to the UCA of the first circular ring, the radius of the transmitted UCA,

Means the radius of the first circular ring. Also

Of the transmitting RF lens antenna

Of the U-shaped circular ring and the receiving RF lens antenna

Lt; RTI ID = 0.0 > UCA < / RTI >

The radius of the second circular ring, the receiving RF lens antenna

Means the radius of the first circular ring. Likewise,

Of the receiving RF lens antenna

Lt; RTI ID = 0.0 > UCA < / RTI >

The radius of the first circular ring, and the radius of the receiving UCA.

According to Equation (7)

Can be expressed by Equation (8) below. Since the channel component depends only on the distance, and according to the structural property of the UCA,

,

The same circulant matrix is used for each diagonal element with the same value.

Each channel matrix is a circulant matrix. In the case of a circulant matrix, eigenvalue decomposition is possible through DFT and IDFT matrices. NXN DFT matrix

The respective channel matrices can be expressed by Equation (9). &Quot; (9) "

here,

Each channel matrix

Is a complex diagonal matrix consisting of eigenvalues obtained by eigenvalue decomposition.

All MIMO channels

Can be expressed by the following Equation (10) by substituting the results of Equations (8) and (9) into Equation (3).

Since the products of the diagonal matrix are represented by diagonal matrices multiplied by their respective diagonal components

To

If you say

Is expressed by Equation (11), and Equation (10) is Equation (12).

In Equation 12,

Lt; RTI ID = 0.0 >

And the eigenvalue decomposition through the DFT matrix of Equation (13).

Accordingly, it can be seen that applying the RF lens antenna to the UCA through Equation (11) and generating and restoring the OAM multi-mode through the DFT matrix is expressed in the same manner as the existing OAM multi-mode generation and restoration.

When the transmitted signal is x and the noise is n, the received signal y is expressed by Equation (14), and considering eigenvalue decomposition by the DFT matrix,

Can be restored.

Where s is the original message signal to send,

As shown in FIG. 7, the transmitter multiplies s by DFT, and is generated in the OAM multi-mode through the UCA and transmitted. The receiver performs the IDFT in reverse to recover the original signal s.

7 is a diagram illustrating a communication system using an OAM according to an embodiment. The communication system includes a transmitting apparatus and a receiving apparatus. Referring to Fig. 7, the transmission apparatus includes a transmission processing unit, a divider, a transmission UCA, and a transmission RF lens antenna. In addition, the receiving apparatus includes a receiving processing unit, an assembler, a receiving UCA, and a receiving RF lens antenna. The communication channel may be a LoS channel.

The transmitting UCA includes N antenna elements and generates N OAM multi-modes through the antenna elements. The transmitting RF lens antenna suppresses the spread of radio waves according to the OAM multi-mode. The transmission processing unit converts the stream vector of NX1 to be transmitted into the transmission signal of NX1 through the DFT matrix of NXN. The divider assigns the transmission signal of NX1 to the N antenna elements of the transmitting UCA.

The receiving RF lens antenna collects the radio waves according to the N OAM multi-mode according to the receiving UCA. The receiving UCA includes N antenna elements and receives radio waves according to the OAM multi-mode through the antenna elements. The assembler receives the received signal of NX1 from the N antenna elements. The reception processing unit converts the received signal of NX1 into the stream vector of NX1 of NX1 through the IDFT matrix of NXN.

FIG. 8 is a flowchart illustrating a transmission method using an OAM according to an embodiment. Referring to FIG. 8, in step 810, the transmitting apparatus generates N OAM multi-modes through N antenna elements included in the transmitting UCA. In step 820, the transmitting device transmits the radio wave according to the OAM multi-mode through the transmitting RF lens antenna. In addition, the transmission apparatus can perform the operations described above, and a detailed description will be omitted.

FIG. 9 is a flowchart illustrating a receiving method using an OAM according to an embodiment. 9, in step 910, the receiving device collects radio waves according to the N OAM multimode through the receiving RF lens antenna to the receiving UCA. In step 920, the receiving device receives radio waves according to the OAM multi-mode through the N antenna elements included in the receiving UCA. In addition, the receiving apparatus can perform the operations described above, and a detailed description will be omitted.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented as a computer-readable recording medium, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims

A transmission apparatus using an Orbital Angular Momentum (OAM)
A transmission processor for transforming a stream vector of NX 1 to be transmitted into a transmission signal of NX 1 through a DFT (Discrete Fourier Transform) matrix of NXN;
A divider for allocating the transmission signal of NX1 to N antenna elements;
A transmitting UCA (Uniform Circular Array) including the N antenna elements and generating N OAM multi-modes through the N antenna elements; And
Cone shape, and suppresses the spread of the radio wave according to the OAM multi-mode, Transmission RF (Radio Frequency) Lens Antenna
Lt; / RTI >
Wherein the transmitting RF lens antenna comprises a plurality of virtual UCA areas corresponding to the type of the transmitting UCA, each of the plurality of virtual UCA areas including wave propagation areas matched to the N antenna elements,
And each of the N OAM multi-modes generated through the N antenna elements is transmitted to the reception RF lens antenna of the reception device through the matched radio wave propagation areas in the plurality of virtual UCA areas.

The method according to claim 1,
A radio wave according to the OAM multi-mode is received through the reception RF lens antenna,
Wherein the transmitting RF lens antenna collects radio waves according to the OAM multi-mode into a radius of the receiving RF lens antenna.

delete

The method according to claim 1,
Wherein each of the plurality of virtual UCA areas has a circular shape corresponding to the type of the transmitting UCA.

The method according to claim 1,
The radio waves according to the OAM multi-mode are transmitted through a transmission channel,
The channel value h on the free space of the transmission channel is the distance from the nth antenna element of the transmitting UCA to the mth antenna element of the receiving UCA

Which is determined based on the following equations for < RTI ID = 0.0 >

-here,

Wow

Denotes the distance between the UCA, the radius of the nth antenna element on the transmitting UCA, and the radius of the mth antenna element of the receiving UCA,

being-
Transmitting apparatus.

A transmission method using an Orbital Angular Momentum (OAM)
Converting a stream vector of NX 1 to be transmitted into a transmission signal of NX 1 through a DFT (Discrete Fourier Transform) matrix of NXN;
Assigning the transmission signal of NX1 to N antenna elements;
Generating N OAM multi-modes through the N antenna elements included in a transmission UCA (Uniform Circular Array); And
Transmitting a radio wave according to the OAM multi-mode through a transmission RF (Radio Frequency) lens antenna
Lt; / RTI >
The propagation in accordance with the OAM multi-mode in which the degree of propagation increases in a higher mode is suppressed by the transmission RF lens antenna,
Wherein the transmitting RF lens antenna comprises a plurality of virtual UCA areas corresponding to the type of the transmitting UCA, each of the plurality of virtual UCA areas including wave propagation areas matched to the N antenna elements,
Wherein each of the N OAM multi-modes generated through the N antenna elements is transmitted to a reception RF lens antenna of the receiver through the matched wave propagation regions in the plurality of virtual UCA areas.

8. The method of claim 7,
A radio wave according to the OAM multi-mode is received through the reception RF lens antenna,
Wherein the transmitting RF lens antenna collects radio waves according to the OAM multi-mode into a radius of the receiving RF lens antenna.

9. The method of claim 8,
Wherein components constituting a transmission channel between the transmission RF lens antenna and the reception RF lens antenna have a property that they depend only on a distance and the transmission channel can be expressed by a circulation matrix.

A receiving apparatus using an Orbital Angular Momentum (OAM)
A receiving RF (Radio Frequency) lens antenna for collecting radio waves according to N OAM multi-modes radiated in a conical shape and increasing in degree in a higher mode according to a receiving UCA (Uniform Circular Array);
A receiving UCA including N antenna elements and receiving radio waves according to the OAM multi-mode through the N antenna elements;
An assembler for receiving NX 1 received signals from the N antenna elements; And
A reception processor for converting the received signal of NX 1 into a stream vector of NX 1 through an IDFT (Inverse Discrete Fourier Transform) matrix of NXN
Lt; / RTI >
Wherein the receiving RF lens antenna comprises a plurality of virtual UCA areas corresponding to the shape of the receiving UCA, each of the plurality of virtual UCA areas including wave propagation areas matched to the N antenna elements,
Wherein each of the N OAM multi-modes is received through the matched wave propagation regions in the plurality of virtual UCA regions and is transmitted to the N antenna elements.

delete

11. The method of claim 10,
Wherein each of the plurality of virtual UCA areas has a circular shape corresponding to the type of the received UCA.

11. The method of claim 10,
The radio waves according to the OAM multi-mode are received through a transmission channel,
The channel value h on the free space of the transmission channel is the distance from the nth antenna element of the transmitting UCA to the mth antenna element of the receiving UCA

Which is determined based on the following equations for < RTI ID = 0.0 >

-here,

Wow

being-
Receiving device.

A receiving method using an Orbital Angular Momentum (OAM)
Collecting radio waves according to N OAM multimode radiated in a conical shape through a receiving RF (Radio Frequency) lens antenna and having a higher degree of spreading in a higher mode, according to a receiving UCA (Uniform Circular Array); And
Receiving radio waves according to the N OAM multi-modes through N antenna elements included in the reception UCA;
Receiving an NX 1 received signal from the N antenna elements via an assembler; And
Transforming the received signal of NX 1 into a stream vector of NX 1 through an IDFT (Inverse Discrete Fourier Transform) matrix of NXN
Lt; / RTI >
Wherein the receiving RF lens antenna comprises a plurality of virtual UCA areas corresponding to the shape of the receiving UCA, each of the plurality of virtual UCA areas including wave propagation areas matched to the N antenna elements,
Wherein each of the N OAM multi-modes is received through the matched wave propagation regions in the plurality of virtual UCA regions and transmitted to the N antenna elements.

16. The method of claim 15,
Wherein the components constituting the transmission channel between the transmission RF lens antenna and the reception RF lens antenna have properties that depend only on the distance and the transmission channel can be represented by a circulation matrix.