Transmitting / receiving device and interference suppression method

Abstract

Provided is a transmitting / receiving device for carrying out transmission and reception through full-duplex communication, the transmitting-receiving device comprising: a discrete Fourier transform circuit for suppressing interference of a transmitted signal that uses an OAM mode different from that of a received signal; and a control unit for suppressing, through digital signal processing, interference of a transmitted signal that uses the same OAM mode as the received signal.

Description

[Technical field]

[0001] The present invention relates to a technique for spatially multiplexing and transmitting wireless signals using the orbital angular momentum (OAM) of electromagnetic waves. [Background technology]

[0002] In recent years, in order to improve transmission capacity, spatial multiplexing transmission technology of radio signals using OAM has been studied (for example, Non-Patent Document 1). In electromagnetic waves with OAM, equiphase surfaces are distributed in a spiral shape along the propagation direction centered on the propagation axis. Since electromagnetic waves with different OAM modes propagating in the same direction have orthogonal spatial phase distributions in the direction of the rotation axis, it is possible to multiplex and transmit signals by separating the signals of each OAM mode modulated with different signal sequences at the receiving device.

[0003] In a wireless communication system using this OAM multiplexing technology, a uniform circular array antenna (hereinafter referred to as UCA (Uniform Circular Array)) in which multiple antenna elements are arranged at equal intervals in a circle is used to generate, combine and transmit multiple OAM modes, thereby realizing spatial multiplexing transmission of different signal sequences (for example, Non-Patent Document 2). For example, a Butler circuit (Butler matrix circuit) is used to generate and separate signals for the multiple OAM modes. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] J.Wang et al., "Terabit free-space data transmission employing orbital angular momentum multiplexing," Nature Photonics, Vol.6, pp.488-496, July 2012. [Non-Patent Document 2] Y.Yan et al., "High-capacity millimeter-wave communications with orbital angular momentum multiplexing," Nature Commun., vol.5, p.4876, Sep. 2014. Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, a transmitter using UCA and a Butler circuit enables large-capacity communications, but in the future, it will be desirable to support full-duplex communications, in which transmission and reception are performed simultaneously on the same frequency.

[0006] However, conventional wireless transmission techniques generally have the problem that a high-level transmission signal may interfere with a received signal, which may result in failure to demodulate the received signal.

[0007] The disclosed technology aims to suppress interference of a transmission signal with a reception signal. [Means for solving the problem]

[0008] The disclosed technology is a transceiver device that transmits and receives signals by full-duplex communication, and suppresses interference between a transmission signal that uses an OAM mode different from that of a reception signal. Butler The circuit, An AD converter that converts the analog signal of each OAM mode output from the Butler circuit into a digital signal; and a signal waveform that is equal in power to and opposite in phase to the radio interference based on previously measured information, and outputs the digital signal from the AD converter. A control unit that suppresses interference of a transmission signal that uses the same OAM mode as the received signal by digital signal processing. Effect of the Invention

[0009] It is possible to suppress interference of a transmission signal with a reception signal. [Brief description of the drawings]

[0010] [Figure 1]FIG. 13 is a diagram illustrating an example of phase setting of a UCA for generating an OAM mode signal. [Diagram 2] 1A to 1C are diagrams illustrating examples of phase distribution and signal intensity distribution of an OAM multiplexed signal. [Diagram 3] 1 is a configuration diagram of a communication system according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram illustrating a configuration example of a transmitting / receiving device according to a first embodiment. [Diagram 5] 1 is a flowchart showing an example of a flow of a transmission / reception process according to the first embodiment. [Figure 6] FIG. 13 is a diagram illustrating a configuration example of a transmission / reception device according to a modified example of the first embodiment. [Figure 7] FIG. 11 is a diagram illustrating a configuration example of a transmitting / receiving device according to a second embodiment. [Figure 8] 11 is a flowchart showing an example of a flow of a transmission / reception process according to the second embodiment. [Figure 9] FIG. 11 is a diagram illustrating a configuration example of a transmitting / receiving device according to a third embodiment. [Figure 10] 13 is a flowchart showing an example of a flow of a transmission / reception process according to a third embodiment. [Figure 11] FIG. 13 is a diagram illustrating a configuration example of a transmission / reception device according to a modified example of the third embodiment. [Figure 12] FIG. 13 is a diagram illustrating a configuration example of a transmitting / receiving device according to a fourth embodiment. [Figure 13] 13 is a flowchart showing an example of a flow of a transmission / reception process according to a fourth embodiment. [Figure 14] FIG. 1 is a first diagram showing an example of an arrangement of UCAs. [Figure 15] FIG. 2 is a second diagram showing an example of UCA placement. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention (the present embodiment) will be described with reference to the drawings. The embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] (Basic operation example) First, a basic setting and operation example relating to UCA used in the transmitting device and the receiving device in this embodiment will be described.

[0013] Fig. 1 is a diagram showing an example of phase setting of a UCA for generating an OAM mode signal. The UCA shown in Fig. 1 is a UCA consisting of eight antenna elements.

[0014] In Fig. 1, signals of OAM modes 0, 1, 2, 3, ... on the transmitting side are generated by the phase difference of the signals supplied to each antenna element (indicated by ●) of the UCA. In other words, a signal of OAM mode n is generated by setting the phase of the signal supplied to each antenna element so that the phase rotates n times (n x 360 degrees). For example, when the UCA is composed of m = 8 antenna elements as shown in Fig. 1 and a signal of OAM mode n = 2 is generated, a phase difference of 360n / m = 90 degrees (0 degrees, 90 degrees, 180 degrees, 270 degrees, 0 degrees, 90 degrees, 180 degrees, 270 degrees) is set counterclockwise for each antenna element so that the phase rotates two times as shown in Fig. 1 (3).

[0015] Note that a signal with the phase rotation direction reversed to that of an OAM mode n signal is called OAM mode -n. For example, the phase rotation direction of a positive OAM mode signal is counterclockwise, and the phase rotation direction of a negative OAM mode signal is clockwise.

[0016] By generating different signal sequences as signals in different OAM modes and transmitting the generated signals simultaneously, wireless communication using spatial multiplexing can be performed. On the transmitting side, signals to be transmitted in each OAM mode may be generated and combined in advance and a combined signal for each OAM mode may be transmitted using a single UCA, or multiple UCAs may be used to transmit signals for each OAM mode using different UCAs for each OAM mode.

[0017] In order to separate the OAM multiplexed signals on the receiving side, the phase of each antenna element of the UCA on the receiving side is set to be opposite to the phase of the antenna elements on the transmitting side.

[0018] Figure 2 shows examples of phase distribution and signal intensity distribution of OAM multiplexed signals. In Figures 2(1) and (2), the arrows represent the phase distribution of OAM mode 1 and OAM mode 2 signals as viewed from the transmitting side at an end face (orthogonal propagation plane) perpendicular to the propagation direction. The arrows start at 0 degrees, the phase changes linearly, and the arrows end at 360 degrees. In other words, an OAM mode n signal propagates while its phase rotates n times (n x 360 degrees) on the orthogonal propagation plane. Note that the arrows of the phase distribution of OAM mode -1 and -2 signals point in opposite directions.

[0019] The system configuration and operation example of this embodiment will be described in detail below.

[0020] (System Configuration) Fig. 3 is a configuration diagram of a communication system according to an embodiment of the present invention. As shown in Fig. 3, the wireless communication system according to the present embodiment includes a plurality of transmission / reception devices 100. Each transmission / reception device 100 transmits and receives wireless communications with each other.

[0021] Each of the transceiver devices 100 includes a UCA and a Butler circuit. In transmitting and receiving desired data, the transceiver device 100 multiplexes and transmits signals of one or more OAM modes, and receives the transmitted signal multiplexed with one or more OAM modes and separates the signals of each OAM mode.

[0022] The transmitting / receiving device 100 is a wireless communication device that performs wireless communication. In this embodiment, the transmitting / receiving device 100 is, for example, a stationary base station and a mobile terminal. However, this assumption is merely an example. For example, the two transmitting / receiving devices 100 may be two stationary base stations or two mobile terminals.

[0023] Hereinafter, configuration examples and operations of the transmitting / receiving device according to the present embodiment will be described using examples of a first embodiment to a fourth embodiment.

[0024] Example 1 The first embodiment is an example in which interference is suppressed by digital signal processing when UCA is not multiplexed.

[0025] (Configuration Example of Transmitter / Receiver According to First Embodiment) 4 is a diagram illustrating a configuration example of a transmission / reception device according to the first embodiment. The transmission / reception device 100 includes DA converters 100-0, . . . , 100-L, an OAM mode generation unit 120, a transmission UCA 130, a reception UCA 140, an OAM mode separation unit 150, AD converters 160-0, . . . , 160-L, and a control unit 170.

[0026] The transmitting / receiving device 100 generates, from the input data, a digital signal to be transmitted on a carrier wave. The DA converters 110-0,...,110-L convert the digital signal of each OAM mode (e.g., OAM mode 0 to OAM mode L) into an analog signal (digital-analog conversion), and convert the frequency of the analog signal into the frequency band of the carrier wave (e.g., 28 GHz band). The transmitting / receiving device 100 inputs the generated analog signal to the OAM mode generating unit 120.

[0027] The OAM mode generation unit 120 includes a Butler circuit 121. The Butler circuit 121 combines analog signals of a plurality of OAM modes and outputs the combined analog signals to the transmitting UCA 130. The transmitting UCA 130 has an antenna element TxUCA1, receives the combined analog signals output from each port of the Butler circuit 121, and transmits a carrier wave to another transmitting / receiving device 100.

[0028] The receiving UCA 140 has an antenna element RxUCA1, receives a carrier wave transmitted from another transmitting / receiving device 100, and inputs it to an OAM mode separation unit 150. The OAM mode separation unit 150 includes a Butler circuit 151. The Butler circuit 151 separates the input analog signal into analog signals for each OAM mode.

[0029] Butler circuit 121 and Butler circuit 151 are an example of a Discrete Fourier Transform (DFT) circuit. Butler circuit 121 and Butler circuit 151 suppress interference of a transmission signal using an OAM mode different from that of a reception signal due to their characteristics. For example, a transmission signal of OAM mode 0 is only transmitted to a reception signal of OAM mode 0, and is not transmitted to a reception signal of other OAM modes (e.g., OAM mode 1, OAM mode 2, etc.).

[0030] AD converters 160-0, . . . , 160-L convert analog signals in each OAM mode into digital signals.

[0031] The control unit 170 suppresses interference of a transmission signal using the same OAM mode as the received signal by digital signal processing. This makes it possible to suppress interference of a transmission signal in the same OAM mode that may occur due to the characteristics of the Butler circuit 121 and the Butler circuit 151.

[0032] (Operation of the transmitting / receiving device according to the first embodiment) Next, the operation of the transmitting / receiving device 100 according to this embodiment will be described.

[0033] 5 is a flowchart illustrating an example of a flow of a transmission / reception process according to the embodiment 1. The Butler circuit 121 of the OAM mode generating unit 120 receives an operation of a transmission instruction or the like and generates a waveform of a transmission signal (step S11).

[0034] Next, the transmitting / receiving device 100 performs full-duplex communication, which is communication in which signals are simultaneously transmitted and received at the same frequency (step S12). Next, the control unit 170 suppresses interference of a transmitting signal using the same OAM mode as the receiving signal by digital signal processing (step S13).

[0035] For example, the control unit 170 can suppress interference by generating and synthesizing a signal waveform with equal power and opposite phase to the radio interference, assuming that the power ratio, delay, phase, etc. of the radio interference with respect to the transmission signal waveform are known (for example, by acquiring information measured in advance). Note that if such information is not known, the transmission / reception device 100 may be provided with a separate circuit for detecting radio interference.

[0036] According to the transmission / reception device 100 of this embodiment, the characteristics of the Butler circuit are used to suppress interference of a transmission signal using an OAM mode different from that of a reception signal, and digital signal processing is used to suppress interference of a transmission signal using the same OAM mode as that of a reception signal. This makes it possible to suppress interference of a transmission signal with a reception signal.

[0037] (Modification of the first embodiment) In the first embodiment, the control unit 170 may convert the generated signal of opposite phase into an analog waveform by D / A conversion, and the analog waveform may be combined with the analog signal of the received signal before A / D conversion.

[0038] 6 is a diagram illustrating an example of the configuration of a transmission / reception device according to a modification of the embodiment 1. The transmission / reception device 100 according to this modification further includes DA converters 111-0, . . . , 111-L.

[0039] DA converters 111-0,...,111-L convert the digital signals generated by control unit 170 into analog signals (digital-analog conversion). The converted analog signals are combined with the analog signals of each OAM mode output from Butler circuit 151. The combined analog signals are converted into digital signals by AD converters 160-0,...,160-L.

[0040] Example 2 A second embodiment will be described below with reference to the drawings. The second embodiment differs from the first embodiment in that interference of a transmission signal using the same OAM mode as a reception signal is suppressed by analog synthesis using an interference suppression circuit. Therefore, the following description of the second embodiment will focus on the differences from the first embodiment, and components having the same functional configuration as the first embodiment will be given the same reference numerals as those used in the description of the first embodiment, and the description thereof will be omitted.

[0041] (Configuration example of a transmitting / receiving device according to the second embodiment) 7 is a diagram illustrating a configuration example of a transmission / reception device according to Example 2. The transmission / reception device 100 according to this embodiment has a configuration in which the control unit 170 is removed from the configuration of the transmission / reception device 100 according to Example 1 and interference suppression circuits 180-0, . . . , 180-L are added.

[0042] The interference suppression circuits 180-0,...,180-L are circuits in the same number as the number of OAM modes that can be generated by the transmission / reception device 100, and for each OAM mode, they suppress interference of a transmission signal that uses the same OAM mode as the received signal. For example, the interference suppression circuit 180-0 suppresses interference of a transmission signal that uses OAM mode 0, and the interference suppression circuit 180-1 suppresses interference of a transmission signal that uses OAM mode 1.

[0043] Specifically, the interference suppression circuits 180-0,...,180-L generate analog signals for synthesis with adjusted power ratios, delay phases, etc., and synthesize the generated analog signals into the received signals separated for each OAM mode. At this time, if the radio interference may have frequency characteristics, the frequency characteristics may be compensated for by making these adjustments in the frequency domain. The interference suppression circuits 180-0,...,180-L are composed of, for example, amplifiers, attenuators, delay circuits, filters, etc.

[0044] (Operation of the transmitting / receiving device according to the second embodiment) Next, the operation of the transmitting / receiving device 100 according to this embodiment will be described.

[0045] 8 is a flowchart illustrating an example of a flow of a transmission / reception process according to Example 2. The Butler circuit 121 of the OAM mode generating unit 120 receives an operation of a transmission instruction or the like and generates a waveform of a transmission signal (step S21).

[0046] Next, the transmission / reception device 100 performs full-duplex communication, which is communication in which signals are transmitted and received simultaneously at the same frequency (step S22). Next, the interference suppression circuits 180-0,...,180-L generate analog signals for synthesis in which the amplitude (power ratio), delay, phase, etc. are adjusted (step S23). Here, the interference suppression circuits 180-0,...,180-L receive the transmission signals after DA conversion in each OAM mode and generate analog signals for synthesis based on the characteristics of the input transmission signals.

[0047] Next, the interference suppression circuits 180-0, . . . , 180-L combine the received signals separated into each OAM mode with an analog signal to be combined (step S24).

[0048] According to the transmission / reception device 100 of this embodiment, the characteristics of the Butler circuit suppress interference of a transmission signal using an OAM mode different from that of a reception signal, and the interference of a transmission signal using the same OAM mode as that of a reception signal is suppressed by combining analog signals by the interference suppression circuit. This makes it possible to suppress interference of a transmission signal with a reception signal.

[0049] In the first embodiment, when radio interference occurs at a power level equal to or higher than the power level at which the AD converters 160-0, . . . , 160-L can receive signals without distortion, the AD converters 160-0, . . . , 160-L cannot accurately sample the received signals. In contrast, the transmission / reception device 100 according to the present embodiment suppresses interference by an analog circuit before the signals are output to the AD converters 160-0, . . . , 160-L. This makes it possible to prevent the AD converters 160-0, . . . , 160-L from being unable to accurately sample the signals.

[0050] Example 3 A third embodiment will be described below with reference to the drawings. The third embodiment differs from the first embodiment in that a multiplexed UCA is used. Therefore, in the following description of the third embodiment, the differences from the first embodiment will be mainly described, and the same reference numerals as those used in the description of the first embodiment will be given to components having the same functional configuration as the first embodiment, and the description thereof will be omitted.

[0051] (Configuration example of a transmitting / receiving device according to the third embodiment) 9 is a diagram illustrating a configuration example of a transmission / reception device according to a third embodiment. The transmission / reception device 100 according to this embodiment has a configuration in which a multiplexing processor 171 and an equalization processor 172 are added to the configuration of the transmission / reception device 100 according to the first embodiment.

[0052] Moreover, the transmitting / receiving device 100 according to this embodiment includes a transmitting multiplex UCA 131 and a receiving multiplex UCA 141 instead of the transmitting UCA 13 and the receiving UCA 140.

[0053] The transmitting multiplex UCA 131 can transmit, for example, N multiplexed signals. The transmitting multiplex UCA 131 has, for example, N UCAs of different diameters arranged in concentric circles. The receiving multiplex UCA 141 can receive, for example, N multiplexed signals. The receiving multiplex UCA 141 has, for example, N UCAs of different diameters arranged in concentric circles.

[0054] The multiplexing processing unit 171 multiplexes the digital signals of each OAM mode to a multiplexing number N. Then, the DA converters 110-1-0,...,110-NL convert the multiplexed digital signals of each OAM mode (e.g., OAM mode 0 to OAM mode L) into analog signals (digital-analog conversion), and convert the frequency of the analog signal into the carrier frequency band (e.g., 28 GHz band). The transmitting / receiving device 100 inputs the generated analog signal to the OAM mode generating unit 120.

[0055] The equalization processing unit 172 equalizes the digital signals multiplexed to the multiplexing number N for each OAM mode using MIMO technology, and obtains the digital signals before being multiplexed by the transmission / reception device 100 at the transmission source.

[0056] (Operation of the transmitting / receiving device according to the third embodiment) Next, the operation of the transmitting / receiving device 100 according to this embodiment will be described.

[0057] 10 is a flowchart illustrating an example of a flow of a transmission / reception process according to the embodiment 3. The Butler circuits 121-1, . . . , 121-N of the OAM mode generating unit 120 generate a waveform of a transmission signal in response to an operation of a transmission instruction or the like (step S31).

[0058] The multiplexing processor 171 multiplexes the digital signals of each OAM mode to a multiplexing number N (step S32).

[0059] Next, the transmitting / receiving device 100 performs full-duplex communication, which is communication in which signals are simultaneously transmitted and received at the same frequency (step S33). Next, the control unit 170 suppresses interference between the multiplexed transmitting signal using the same OAM mode as the multiplexed receiving signal by digital signal processing (step S34).

[0060] The equalization processor 172 equalizes the digital signals multiplexed to the multiplexing number N for each OAM mode by the MIMO technique, and obtains the digital signals before being multiplexed by the source transmitting / receiving device 100 (step S35).

[0061] According to the transmission / reception device 100 of this embodiment, the characteristics of the Butler circuit compatible with multiplexing are used to suppress interference of a transmission signal using an OAM mode different from that of a reception signal, and digital signal processing compatible with multiplexing is used to suppress interference of a transmission signal using the same OAM mode as that of a reception signal. This makes it possible to suppress interference of a transmission signal with a reception signal.

[0062] (Modification of the third embodiment) In the third embodiment, the control unit 170 may convert the generated signal of opposite phase into an analog waveform by D / A conversion, and the analog waveform may be combined with the analog signal of the received signal before A / D conversion.

[0063] 11 is a diagram showing a configuration example of a transmission / reception device according to a modification of the embodiment 3. The transmission / reception device 100 according to this modification further includes DA converters 111-1-0, . . . , 111-NL.

[0064] The DA converters 111-1-0,...,111-NL convert the digital signals generated by the control unit 170 into analog signals (digital-analog conversion). The converted analog signals are combined with the multiplexed analog signals of each OAM mode output from the Butler circuits 151-1,...,151-N. The combined analog signals are converted into digital signals by the AD converters 160-1-0,...,160-NL.

[0065] Example 4 A fourth embodiment will be described below with reference to the drawings. The fourth embodiment differs from the third embodiment in that interference of a transmission signal using the same OAM mode as a reception signal is suppressed by analog synthesis using an interference suppression circuit. Therefore, in the following description of the fourth embodiment, the differences from the third embodiment will be mainly described, and the same reference numerals as those used in the description of the third embodiment will be given to components having the same functional configuration as the third embodiment, and the description thereof will be omitted.

[0066] (Configuration example of a transmitting / receiving device according to the fourth embodiment) 12 is a diagram illustrating a configuration example of a transmission / reception device according to a fourth embodiment. The transmission / reception device 100 according to this embodiment has a configuration in which the control unit 170 is removed from the configuration of the transmission / reception device 100 according to the third embodiment and interference suppression circuits 180-0, . . . , 180-L are added.

[0067] The interference suppression circuits 180-0,...,180-L are circuits in the same number as the number of OAM modes that can be generated by the transmission / reception device 100, and for each OAM mode, they suppress interference of a transmission signal that uses the same OAM mode as the received signal. For example, the interference suppression circuit 180-0 suppresses interference of a multiplexed transmission signal that uses OAM mode 0, and the interference suppression circuit 180-1 suppresses interference of a multiplexed transmission signal that uses OAM mode 1.

[0068] Specifically, the interference suppression circuits 180-0, . . . , 180-L generate analog signals for synthesis in which the power ratio, delay, phase, etc. of the transmission signal waveforms are adjusted according to the number of multiplexes, and synthesize the generated analog signals with the reception signals separated for each OAM mode for each multiplexed reception signal. At this time, if the radio interference may have frequency characteristics, the frequency characteristics may be compensated for by making these adjustments in the frequency domain.

[0069] (Operation of the transmitting / receiving device according to the fourth embodiment) Next, the operation of the transmitting / receiving device 100 according to this embodiment will be described.

[0070] 13 is a flowchart illustrating an example of a flow of a transmission / reception process according to the embodiment 4. The Butler circuits 121-1, . . . , 121-N of the OAM mode generating unit 120 generate a waveform of a transmission signal in response to an operation of a transmission instruction or the like (step S41).

[0071] The multiplexing processor 171 multiplexes the digital signals of each OAM mode to a multiplexing number N (step S42).

[0072] Next, the transmitting / receiving device 100 performs full-duplex communication, which is communication in which signals are transmitted and received simultaneously at the same frequency (step S43). Next, the interference suppression circuits 180-0,...,180-L generate analog signals for combining, with adjusted amplitude (power ratio), delay, phase, and the like, in accordance with the number of multiplexes N (step S44). Here, the interference suppression circuits 180-0,...,180-L receive input of transmission signals after DA conversion in each OAM mode, and generate analog signals for combining based on the characteristics of the input transmission signals.

[0073] Next, the interference suppression circuits 180-0, . . . , 180-L combine the multiplexed received signals separated into each OAM mode with an analog signal to be combined (step S45).

[0074] The equalization processing unit 172 equalizes the digital signals multiplexed to the multiplexing number N for each OAM mode by the MIMO technique, and obtains the digital signals before being multiplexed by the source transmitting / receiving device 100 (step S46).

[0075] According to the transmission / reception device 100 of this embodiment, the characteristics of the Butler circuit compatible with multiplexing suppress interference of a transmission signal using an OAM mode different from that of a reception signal, and the synthesis of analog signals by the interference suppression circuit compatible with multiplexing suppresses interference of a transmission signal using the same OAM mode as that of a reception signal. This makes it possible to suppress interference of a transmission signal with a reception signal.

[0076] Fig. 14 is a first diagram showing an example of the arrangement of UCAs. As shown in Fig. 14, each antenna element is divided into an antenna element for reception and an antenna element for transmission.

[0077] For example, in the UCA, antenna elements RxUCA1 of a first multiplexing number of the receiving multiplex UCA 141 are arranged along a first circular ring, and antenna elements TxUCA1 of a first multiplexing number of the transmitting multiplex UCA 131 are arranged along a second circular ring. In addition, in the UCA, antenna elements RxUCA2 of a second multiplexing number of the receiving multiplex UCA 141 are arranged along a third circular ring, and antenna elements TxUCA2 of a second multiplexing number of the transmitting multiplex UCA 131 are arranged along a fourth circular ring.

[0078] 15 is a second diagram showing an example of the arrangement of UCAs. As shown in FIG. 15, each antenna element may be used for both reception and transmission.

[0079] For example, each antenna element arranged along the first radial ring of the UCA functions as an antenna element RxUCA1 of the first multiplexed number of the receiving multiplexed UCA 141, and also functions as an antenna element TxUCA1 of the first multiplexed number of the transmitting multiplexed UCA 131.

[0080] Each antenna element arranged along the second radial ring of the UCA functions as an antenna element RxUCA2 of the second multiplexed number of the receiving multiplexed UCA 141, and also functions as an antenna element TxUCA2 of the second multiplexed number of the transmitting multiplexed UCA 131.

[0081] As described above, the transmission / reception device 100 according to each embodiment suppresses interference of a transmission signal using an OAM mode different from that of a reception signal by utilizing the characteristics of the Butler circuit, and suppresses interference of a transmission signal using the same OAM mode as that of a reception signal by utilizing digital signal processing or analog signal synthesis by an interference suppression circuit. This makes it possible to suppress interference of a transmission signal with a reception signal.

[0082] (Summary of the embodiment) This specification describes at least the transmitting / receiving apparatus and the interference suppression method described in the following items. (Section 1) A transmitting / receiving device that transmits and receives data by full-duplex communication, a discrete Fourier transform circuit that suppresses interference between a transmission signal that uses an OAM mode different from that of a reception signal; A control unit that suppresses interference of a transmission signal using the same OAM mode as the reception signal by digital signal processing. Transmitting and receiving equipment. (Section 2) A transmitting / receiving device that transmits and receives data by full-duplex communication, a discrete Fourier transform circuit that suppresses interference between a transmission signal that uses an OAM mode different from that of a reception signal; and an interference suppression circuit that suppresses interference of a transmission signal using the same OAM mode as the reception signal by combining analog signals. Transmitting and receiving equipment. (Section 3) a transmission multiplexing UCA for transmitting a multiplexed signal of each OAM mode; A receiving multiplexing UCA for receiving a multiplexed signal of each OAM mode, The control unit suppresses interference of a multiplexed transmission signal using the same OAM mode as the multiplexed received signal. A transmitting / receiving device as described in item 1. (Section 4) a transmission multiplexing UCA for transmitting a multiplexed signal of each OAM mode; A receiving multiplexing UCA for receiving a multiplexed signal of each OAM mode, The interference suppression circuit generates an analog signal for synthesis in which a power ratio, a delay, or a phase is adjusted according to the number of multiplexes, and synthesizes the generated analog signal with the reception signals separated into each OAM mode for each multiplexed reception signal. 3. A transmitting / receiving device as described in item 2. (Section 5) The discrete Fourier transform circuit is a Butler circuit. A transmitting / receiving device according to any one of claims 1 to 4. (Section 6) A transmitting / receiving device that transmits and receives data by full-duplex communication, Suppressing interference from a transmission signal that uses a different OAM mode from that of a reception signal; Suppressing interference of a transmission signal using the same OAM mode as the received signal by digital signal processing; Interference suppression methods. (Section 7) A transmitting / receiving device that transmits and receives data by full-duplex communication, Suppressing interference from a transmission signal that uses a different OAM mode from that of a reception signal; Combining analog signals to suppress interference between transmitted signals using the same OAM mode as the received signal. Interference suppression methods.

[0083] Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0084] 100 Transmitting / receiving device 110 Digital to analog converter 120 OAM mode generation unit 121 Butler Circuit 130 UCA for sending 131 Multiplex UCA for transmission 140 Receiving UCA 141 Multiplex UCA for reception 150 OAM mode separation section 160 A / D converter 170 Control section 171 Multiplexing Processing Unit 172 Equalization processing section 180 Interference suppression circuit

Claims

1. A transmitting / receiving device that transmits and receives data by full-duplex communication, a Butler circuit for suppressing interference of a transmit signal using a different OAM mode than a receive signal; an AD converter for converting the analog signal of each OAM mode outputted from the Butler circuit into a digital signal; and a control unit that generates a signal waveform having equal power and opposite phase to the radio interference based on information measured in advance, and suppresses interference of a transmission signal using the same OAM mode as the reception signal by digital signal processing of the digital signal output by the AD converter. Transmitting and receiving equipment.

2. A transmitting / receiving device that transmits and receives data by full-duplex communication, a Butler circuit for suppressing interference of a transmit signal using a different OAM mode than a receive signal; an interference suppression circuit that generates a signal waveform having equal power and opposite phase to the radio interference based on information measured in advance, and suppresses interference of a transmission signal using the same OAM mode as the reception signal by synthesizing an analog signal for each OAM mode analog signal output by the Butler circuit; Transmitting and receiving equipment.

3. a transmission multiplexing UCA for transmitting multiplexed signals of each OAM mode; a receiving multiplexing UCA for receiving multiplexed signals of each OAM mode; The control unit suppresses interference between a multiplexed transmission signal using the same OAM mode as the multiplexed reception signal. The transmitting / receiving device according to claim 1 .

4. a transmission multiplexing UCA for transmitting multiplexed signals of each OAM mode; a receiving multiplexing UCA for receiving multiplexed signals of each OAM mode; The interference suppression circuit generates an analog signal for synthesis in which a power ratio, a delay, or a phase is adjusted according to the number of multiplexes, and synthesizes the generated analog signal with the reception signals separated into each OAM mode for each multiplexed reception signal. The transmitting / receiving device according to claim 2.

5. In a transmitting / receiving device that transmits and receives data by full-duplex communication, A Butler circuit suppresses interference of a transmit signal that uses a different OAM mode than a receive signal; An AD converter converts the analog signal of each OAM mode outputted from the Butler circuit into a digital signal; A control unit generates a signal waveform having equal power and opposite phase to the radio interference based on information measured in advance, and suppresses interference of a transmission signal using the same OAM mode as the reception signal by digital signal processing of the digital signal output by the AD converter. Interference suppression methods.

6. In a transmitting / receiving device that transmits and receives data by full-duplex communication, A Butler circuit suppresses interference of a transmit signal that uses a different OAM mode than a receive signal; An interference suppression circuit generates a signal waveform having equal power and opposite phase to the radio interference based on previously measured information, and suppresses interference of a transmission signal using the same OAM mode as the reception signal by synthesizing an analog signal for each OAM mode analog signal output by the Butler circuit. Interference suppression methods.

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