Inter-polarization self-interference canceller for dual-polarization full-duplex transceiver

Abstract

The present invention relates to a polarization inter-polarization magnetic interference canceller for a dual-polarization full-duplex transceiver, comprising: a first RF transceiver connecting a first transmitting node, a first BN node, and a first receiving node through a first duplexer connected to an antenna; a second RF transceiver connecting a second transmitting node, a second BN node, and a second receiving node through a second duplexer connected to the antenna; and a magnetic interference canceller configured between the first and second RF transceivers, comprising a first magnetic interference canceller connecting the first BN node and the second receiving node through a first coupler and a second magnetic interference canceller connecting the second BN node and the first receiving node through a second coupler.

Description

Technology Field

[0001] The present invention relates to a dual-polarized full-duplex transceiver, and more specifically, to a magnetic interference canceller for a dual-polarized full-duplex transceiver capable of eliminating magnetic interference between polarizations and reducing potential losses. Background Technology

[0003] In order to increase the capacity of wireless spectrum resources, various implementation technologies for in-band full-duplex and dual-polarization transmission and reception systems that communicate at the same time and frequency are being researched. In-band full-duplex communication methods can process about twice the amount of data in the same time compared to Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0004] A dual-polarization transceiver system is a technology that transmits and receives electromagnetic waves using two orthogonal (mutually perpendicular) polarizations. It is primarily used in wireless communication, radar, and satellite communication and can improve frequency band efficiency. However, due to various physical and environmental factors, a horizontally polarized signal may be transmitted to a vertically polarized receiver, or vice versa, resulting in self-interference between polarizations. Since the channel capacity gain is significantly reduced when the orthogonality of the dual-polarization signals collapses, it is necessary to eliminate self-interference between polarizations.

[0005] Figure 1 is a diagram showing an example of a conventional inter-polarization magnetic interference canceller.

[0006] As shown in FIG. 1, the existing inter-polarization self-interference canceller (10) adds a coupler (11) to one polarization transmitter (TX) and adds a power combiner (13) to another polarization receiver (RX). The inter-polarization self-interference canceller (10) couples the signal from one polarization transmitter (TX) through the coupler (11), adjusts the magnitude and phase of the signal, and combines it with the signal input to the other polarization receiver (RX) through the power combiner (13) to cancel out the inter-polarization self-interference signal. The inter-polarization self-interference canceller (10) cancels out the self-interference signal by adjusting the magnitude and phase of the coupled transmission signal so that it has the same magnitude and opposite phase as the self-interference signal input to the other polarization receiver (RX).

[0007] Conventional interpolarization magnetic interference cancellers add a coupler to the transmitter to couple the transmitted signal. However, during the process of separating the signal at the transmitter, power loss occurs due to the coupler, which can lead to a reduction in the transmission output to the antenna. This can result in a reduction in communication distance, degradation of signal quality, and reduced power efficiency.

[0008] Therefore, inter-polarization self-interference cancellation technology is needed to reduce signal loss and improve signal quality. Prior art literature

[0010] Korean Published Patent Application No. 10-2016-0150589 (Dec. 30, 2016) Korean Registered Patent Application No. 10-2693793 (Aug. 6, 2024) The problem to be solved

[0011] One embodiment of the present invention aims to provide an inter-polarization self-interference canceller for a dual-polarization full-duplex transceiver that eliminates inter-polarization self-interference and reduces potential losses.

[0012] One embodiment of the present invention aims to provide a polarization inter-polarization self-interference canceller for a dual-polarization full-duplex transceiver that can improve output power by reducing the loss of the transmitted signal output to the antenna while canceling polarization inter-polarization self-interference by adding a coupler to the balance network of the EBD (Electrical Balance Duplex) in a dual-polarization full-duplex transceiver system. means of solving the problem

[0014] Among the embodiments, the inter-polarization magnetic interference canceller of the dual-polarized full-duplex transceiver comprises: a first RF transceiver connecting a first transmitting node, a first BN node, and a first receiving node through a first duplexer connected to an antenna; a second RF transceiver connecting a second transmitting node, a second BN node, and a second receiving node through a second duplexer connected to the antenna; and a magnetic interference canceller configured between the first and second RF transceivers and comprising a first magnetic interference canceller connecting the first BN node and the second receiving node through a first coupler and a second magnetic interference canceller connecting the second BN node and the first receiving node through a second coupler.

[0015] The first and second RF transceivers can implement a dual-polarization full-duplex transceiver based on vertical polarity (V POL) and horizontal polarity (H POL).

[0016] The above-mentioned magnetic interference cancellation unit can perform VH magnetic interference cancellation (Vertical-Horizontal Self-Interference Cancellation) through the above-mentioned first magnetic interference cancellation unit.

[0017] The first self-interference canceller may include a first variable gain amplifier that receives a first BN signal of the first BN node through the first coupler; and a first phase shifter that receives the output of the first variable gain amplifier.

[0018] The first magnetic interference canceller may further include a first power combiner that connects the output of the first phase shifter to the second receiving node.

[0019] The above-mentioned magnetic interference cancellation unit can perform HV magnetic interference cancellation (Horizontal-Vertical Self-Interference Cancellation) through the above-mentioned second magnetic interference cancellation unit.

[0020] The second self-interference canceller may include a second variable gain amplifier that receives a second BN signal of the second BN node through the second coupler; and a second phase shifter that receives the output of the second variable gain amplifier.

[0021] The second magnetic interference canceller may further include a second power combiner that connects the output of the second phase shifter to the first receiving node.

[0022] Among the embodiments, the interpolarization magnetic interference canceller of a dual-polarized full-duplex transceiver comprises: first and second RF transceivers interconnected through an antenna, each comprising a duplexer, a transmitting node, a BN node, and a receiving node; and a magnetic interference canceller composed of first and second magnetic interference cancellers disposed between the first and second RF transceivers and connecting the mutual BN node and receiving node of the first and second RF transceivers through first and second couplers.

[0023] The first and second RF transceivers can implement a dual-polarization full-duplex transceiver based on vertical polarity (V POL) and horizontal polarity (H POL).

[0024] The above magnetic interference removal unit can perform VH magnetic interference removal and HV magnetic indirect removal through the above first and second magnetic interference removers. Effects of the invention

[0026] The disclosed technology may have the following effects. However, this does not mean that a specific embodiment must include all of the following effects or only the following effects; therefore, the scope of the rights of the disclosed technology should not be understood as being limited by this.

[0027] An inter-polarization magnetic interference canceller of a dual-polarization full-duplex transceiver according to one embodiment of the present invention can eliminate inter-polarization magnetic interference and reduce potential losses.

[0028] An inter-polarization magnetic interference canceller of a dual-polarization full-duplex transceiver according to one embodiment of the present invention can improve output power by adding a coupler to the balance network of the Electrical Balance Duplex (EBD) in a dual-polarization full-duplex transceiver system to cancel inter-polarization magnetic interference and reduce the loss of the transmitted signal output to the antenna.

[0029] The interpolarization self-interference canceller of a dual-polarization full-duplex transceiver according to one embodiment of the present invention can obtain high isolation between the vertical polarization transceiver and the horizontal polarization transceiver in a dual-polarization full-duplex transceiver system and can contribute to improving the performance of the dual-polarization full-duplex system by reducing transmission signal degradation caused by the coupler. Brief explanation of the drawing

[0031] Figure 1 is a diagram showing an example of a conventional inter-polarization magnetic interference canceller. FIG. 2 is a drawing showing an inter-polarization self-interference canceller of a dual-polarization full-duplex transceiver according to one embodiment of the present invention. FIG. 3 is a diagram showing the structure of an electrically balanced duplexer (EBD) according to one embodiment. Figure 4 is a diagram illustrating the transmission and reception status of the electrically balanced duplexer (EBD) of Figure 3. Specific details for implementing the invention

[0032] The description of the present invention is merely an example for structural or functional explanation, and therefore the scope of the present invention should not be interpreted as being limited by the examples described in the text. That is, since the examples are subject to various modifications and may take various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical concept. Furthermore, the objectives or effects presented in the present invention do not imply that a specific example must include all of them or only such effects; therefore, the scope of the present invention should not be understood as being limited by them.

[0033] Meanwhile, the meaning of the terms described in this application should be understood as follows.

[0034] Terms such as "first," "second," etc., are intended to distinguish one component from another, and the scope of rights shall not be limited by these terms. For example, the first component may be named the second component, and similarly, the second component may be named the first component.

[0035] When it is stated that one component is "connected" to another component, it should be understood that it may be directly connected to that other component, or that there may be other components in between. Conversely, when it is stated that one component is "directly connected" to another component, it should be understood that there are no other components in between. Meanwhile, other expressions describing the relationships between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same way.

[0036] A singular expression should be understood to include a plural expression unless the context clearly indicates otherwise, and terms such as "include" or "have" are intended to specify the existence of the implemented features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood not to preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0037] In each step, identifiers (e.g., a, b, c, etc.) are used for convenience of explanation and do not describe the order of the steps; the steps may occur differently from the specified order unless a specific order is clearly indicated in the context. That is, the steps may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

[0038] Unless otherwise defined, all terms used herein have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the context of the relevant technology and should not be interpreted as having an ideal or overly formal meaning unless explicitly defined in this application.

[0040] FIG. 2 is a drawing showing an inter-polarization self-interference canceller of a dual-polarization full-duplex transceiver according to one embodiment of the present invention.

[0041] Referring to FIG. 2, the inter-polarization self-interference canceller (hereinafter, inter-polarization self-interference canceller) (200) of a dual-polarization full-duplex transceiver may include first and second RF transceivers (210, 220) and a self-interference canceller (230).

[0042] The first and second RF transceivers (210, 220) are interconnected via an antenna, and each may be configured to include a duplex, a transmitting node, a Balance Network (BN) node, and a receiving node.

[0043] The first RF transceiver (210) connects the first transmitting node (212), the first BN node (213), and the first receiving node (214) through the first duplexer (211) connected to the antenna.

[0044] The second RF transceiver (220) connects the second transmitting node (222), the second BN node (223), and the second receiving node (224) through the second duplexer (221) connected to the antenna.

[0045] Here, the first and second RF transceivers (210, 220) implement a dual-polarization full-duplex transceiver based on vertical polarity (V POL) and horizontal polarity (H POL). The dual-polarization full-duplex transceiver transmits and receives vertical and horizontal polarizations simultaneously, and by performing transmission and reception simultaneously on the same channel, it can increase bandwidth efficiency and maximize communication capacity. The dual-polarization full-duplex transceiver may be implemented by including a dual-polarized antenna to transmit and receive vertical and horizontal polarizations from a single antenna. Among the first and second RF transceivers (210, 220), the transmitter (TX) transmits data in vertical and horizontal polarizations, and the transmitted signal is separated into two polarizations simultaneously from a single antenna. Among the first and second RF transceivers (210, 220), the receiver (RX) simultaneously receives vertical and horizontal polarized signals received with the same antenna.

[0046] The first and second duplexers (211, 221) separate the transmitted signal and the received signal and process transmission and reception simultaneously in the same frequency band. Here, the first and second duplexers (211, 221) can be combined with an electrical balance circuit to implement an Electrical Balance Duplexer (EBD) that eliminates self-interference between transmission and reception. This is explained in detail through FIGS. 3 and 4.

[0048] FIG. 3 is a diagram showing the structure of an electrically balanced duplexer (EBD) according to one embodiment, and FIG. 4 is a diagram explaining the transmission and reception state of the electrically balanced duplexer (EBD) of FIG. 3.

[0049] First, referring to FIG. 3, the first and second duplexers (211, 221) are composed of an electrically balanced duplexer (EBD) (310). The electrically balanced duplexer (EBD) (310) is a device that enables simultaneous transmission and reception using a single antenna in full-duplex communication, and can eliminate interference between transmission and reception by maintaining electrical balance so that the transmitted signal does not interfere with the received signal. Electrical balance refers to a state in which the impedances of the transmission path and the reception path are balanced so that the transmitted signal is not reflected and does not affect the received signal. To this end, the electrically balanced duplexer (EBD) (310) has a matching network for each antenna (320) and the transmitting and receiving nodes so that the impedances are matched. The impedance matching network may include an antenna matching network (311), a transmitting node matching network (312), and a receiving node matching network (313). In an electrically balanced duplexer (EBD) (310), since the transmission and reception signals are transmitted through a single common antenna (320), the impedance characteristics of the antenna (320) are important, and if the impedance between the antenna and the transceiver is mismatched, the transmission signal may be reflected, causing magnetic interference. The electrically balanced duplexer (EBD) (310) includes a Balance Network (BN) that can be tuned to have the same impedance as the antenna (320). The Balance Network (BN) matches the impedance between the transmitter and the antenna so that the transmission signal can be accurately transmitted to the antenna. Here, the Balance Network (BN) may include first and second BN nodes (213, 223).

[0050] In the transmission state, the electrically balanced duplexer (EBD) (310) transmits half of the transmission signal to the antenna (320) and the balance network (BN) as shown in FIG. 4 (a). In the ideal case where the impedances of the electrically balanced duplexer (EBD) (310) are exactly matched, both the transmission signal and the reception signal have half the power loss (e.g., 3 dB). Additionally, the electrically balanced duplexer (EBD) (310) isolates the transmission signal when the transmission signal is input to the receiving end. In the reception state, if the impedance of the receiving end is mismatched, the isolation between the transmitting end and the receiving end is reduced as shown in FIG. 4 (b), resulting in additional loss of the reception signal.

[0051] The polarization-to-polarization self-interference canceller (200) can couple half of the transmission signals transmitted to the balance network (BN) by adding a coupler to the balance network (BN) of the electrical balance duplexer (EBD) (310). Since the balance network (BN) performs impedance matching and maintains electrical balance, adding a coupler to the balance network (BN) allows for more precise control of the signal impedance and power levels, thereby increasing the accuracy of self-interference cancellation. In particular, since the signal in the balance network (BN) is a low-power signal compared to the transmission end, signal loss due to the coupler is relatively small, which can prevent degradation of transmission performance.

[0053] Returning to FIG. 2, the first and second transmitting nodes (212, 222) are paths through which the transmitting signal is transmitted, and the transmitting signal is transmitted to the antenna through polarization. The first and second BN nodes (213, 223) are networks that perform impedance matching and maintain electrical balance to eliminate self-interference between the transmitting signal and the receiving signal. The first and second receiving nodes (214, 224) are parts that receive signals received from the outside, and are controlled so that the signal entering the receiving path is not subject to self-interference.

[0054] The self-interference cancellation unit (230) may be composed of first and second self-interference cancellers (231, 232) that are positioned between the first and second RF transceivers (210, 220) and connect the mutual BN nodes (213, 223) and receiving nodes (214, 224) of the first and second RF transceivers (210, 220) through first and second couplers (241, 242). The self-interference cancellation unit (230) may perform VH self-interference cancellation (Vertical-Horizontal Self-Interference Cancellation) through the first self-interference canceller (231). The self-interference cancellation unit (230) may perform HV self-interference cancellation (Horizontal-Vertical Self-Interference Cancellation) through the second self-interference canceller (232).

[0055] The first self-interference canceller (231) connects the first BN node (213) and the second receiving node (224) through the first coupler (241). The first self-interference canceller (231) can prevent the vertically polarized transmission signal of the first RF transceiver (210) from interfering with the horizontally polarized receiving path of the second RF transceiver (220) through VH self-interference canceller. VH self-interference canceller can be performed by coupling the transmission signal to cancel it out in the receiving path in order to prevent the vertically (V) polarized transmission signal from interfering with the signal received in the horizontal (H) polarization.

[0056] The second self-interference canceller (232) connects the second BN node (223) and the first receiving node (214) through the second coupler (242). The second self-interference canceller (232) can prevent the horizontally polarized transmission signal of the second RF transceiver (220) from interfering with the vertically polarized receiving path of the first RF transceiver (210) through HV self-interference canceller. HV self-interference canceller prevents the horizontally (H) polarized transmission signal from interfering with the signal received in the vertical (V) polarization and operates by using the coupled transmission signal to cancel self-interference.

[0057] Here, the first and second couplers (241, 242) correspond to circuits that couple a portion of the transmission signal to the first and second self-interference cancellers (231, 232). The first coupler (241) couples the vertically polarized transmission signal transmitted to the first BN node (213). The second coupler (242) couples the horizontally polarized transmission signal transmitted to the second BN node (223).

[0058] The first self-interference canceller (231) may include a first variable gain amplifier (VGA1) that receives the first BN signal of the first BN node (213) through the first coupler (241), and a first phase shifter (PS1) that receives the output of the first variable gain amplifier (VGA1). The first self-interference canceller (231) can generate a VH self-interference canceller signal by adjusting the magnitude and phase of the transmitted signal coupled through the first coupler (241) through the first variable gain amplifier (VGA1) and the first phase shifter (PS1). The first variable gain amplifier (VGA1) adjusts the gain of the received first BN signal to match the magnitude of the signal to the magnitude of the self-interference signal input to the second receiving node (224). The first phase shifter (PS1) adjusts the phase of the magnitude-adjusted signal to the inverse phase of the self-interference signal so that the self-interference signal can be canceled out.

[0059] The first magnetic interference canceller (231) can connect the output of the first phase shifter (PS1) to the second receiving node (224) through the first power combiner (251). The first power combiner (251) can combine the signal received by the antenna with the VH magnetic interference canceller signal to cancel out magnetic interference between polarizations. The first power combiner (251) cancels out the magnetic interference signal by combining the signal input to the second receiving node (224) with the signal converted to an inverse phase through the first phase shifter (PS1). When two signals of the same magnitude and opposite phase are combined, a cancellation effect occurs, and the magnetic interference component is removed.

[0060] The second self-interference canceller (232) may include a second variable gain amplifier (VGA2) that receives the second BN signal of the second BN node (223) through the second coupler (242), and a second phase shifter (PS2) that receives the output of the second variable gain amplifier (VGA2). The second self-interference canceller (232) can generate an HV self-interference canceller signal by adjusting the magnitude and phase of the transmitted signal coupled through the second coupler (242) through the second variable gain amplifier (VGA2) and the second phase shifter (PS2). The second variable gain amplifier (VGA2) adjusts the gain of the received second BN signal to match the magnitude of the signal to the magnitude of the self-interference signal input to the first receiving node (214). The second phase shifter (PS2) adjusts the phase of the magnitude-adjusted signal to the inverse phase of the self-interference signal so that the self-interference signal can be canceled out.

[0061] The second magnetic interference canceller (232) can connect the output of the second phase shifter (PS2) to the first receiving node (214) through the second power combiner (252). The second power combiner (252) can combine the signal received by the antenna with the HV magnetic interference canceller signal to eliminate magnetic interference between polarizations. The second power combiner (252) cancels out the magnetic interference signal by combining the signal input to the first receiving node (214) with the signal converted to an inverse phase through the second phase shifter (PS2). When two signals of the same magnitude and opposite phase are combined, a cancellation effect occurs, and the magnetic interference component is eliminated.

[0062] Thus, self-interference between polarizations in a dual-polarization full-duplex transceiver can be effectively eliminated to maintain the high quality of the received signal.

[0064] The interpolarization magnetic interference canceller according to the present invention is applied to a dual-polarization full-duplex transceiver. Compared to the conventional method of adding a coupler to the transmitter, the coupler is added to the balance network through which a portion of the EBD transmission signal is transmitted, thereby reducing performance degradation at the transmitter caused by losses in the coupler and improving the system performance of the dual-polarization full-duplex transceiver.

[0066] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims. Explanation of the symbols

[0068] 200: Interpolarization Self-Interference Canceller for Dual-Polarized Full-Duplex Transceivers 210: 1st RF transceiver 211: 1st duplexer 212: 1st transmitting node 213: 1st BN Node 214: 1st Receiving Node 220: 2nd RF transceiver 221: Second duplexer 222: Second transmitting node 223: 2nd BN Node 224: 2nd Receiving Node 230: Self-interference removal unit 231: 1st Magnetic Interference Canceller 232: 2nd Magnetic Interference Canceller 241: 1st coupler 242: 2nd coupler 251: 1st power combiner 252: 2nd power combiner VGA1: 1st variable gain amplifier VGA2: 2nd variable gain amplifier PS1: 1st Phase Transition PS2: 2nd Phase Transition 310: Electrical Equilibrium Duplexer (EBD) 320: Antenna

Claims

Claim 1 A first RF transceiver connecting a first transmitting node, a first BN node, and a first receiving node through a first duplexer connected to an antenna; a second RF transceiver connecting a second transmitting node, a second BN node, and a second receiving node through a second duplexer connected to the antenna; and a first self-interference canceller disposed between the first and second RF transceivers and connecting the first BN node and the second receiving node through a first coupler to perform VH self-interference cancellation by adjusting the magnitude and phase of the vertical (V) polarized transmission signal to prevent the vertical (V) polarized transmission signal from interfering with the signal received in horizontal (H) polarization, and a first self-interference canceller that prevents the vertical polarized transmission signal of the first RF transceiver from interfering with the horizontal polarization receiving path of the second RF transceiver, and a second coupler connecting the second BN node and the first receiving node to perform HV self-interference cancellation by adjusting the magnitude and phase of the horizontal (H) polarized transmission signal to prevent the horizontal (H) polarized transmission signal from interfering with the signal received in vertical (V) polarization, thereby the horizontal polarization transmission signal of the second RF transceiver The magnetic interference removal unit comprises a second magnetic interference removal unit that prevents interference with the reception path of the vertical polarization of the first RF transceiver, and the first and second couplers correspond to a circuit that couples a portion of the transmission signal of the vertical (V) polarization and the transmission signal of the horizontal (H) polarization to the first and second magnetic interference removal units, wherein the first coupler couples the transmission signal of the vertical polarization transmitted to the first BN node and the second coupler couples the transmission signal of the horizontal polarization transmitted to the second BN node. Claim 2 A polarization inter-polarization self-interference canceller for a dual-polarization full-duplex transceiver, characterized in that, in claim 1, the first and second RF transceivers implement a dual-polarization full-duplex transceiver based on vertical polarity (V POL) and horizontal polarity (H POL). Claim 3 delete Claim 4 The polarization-inter-polarization self-interference canceller of a dual-polarization full-duplex transceiver according to claim 1, wherein the first self-interference canceller comprises: a first variable gain amplifier that receives a first BN signal of the first BN node through the first coupler; and a first phase shifter that receives the output of the first variable gain amplifier. Claim 5 In claim 4, the polarization-inter-polarization inter-polarization canceller of a dual-polarization full-duplex transceiver is characterized in that the first magnetic interference canceller further includes a first power combiner that connects the output of the first phase shifter to the second receiving node. Claim 6 delete Claim 7 The polarization-inter-polarization self-interference canceller of a dual-polarization full-duplex transceiver according to claim 1, wherein the second self-interference canceller comprises: a second variable gain amplifier that receives a second BN signal of the second BN node through the second coupler; and a second phase shifter that receives the output of the second variable gain amplifier. Claim 8 A polarization-inter-polarization magnetic interference remover of a dual-polarization full-duplex transceiver, characterized in that, in claim 7, the second magnetic interference remover further includes a second power combiner that connects the output of the second phase shifter to the first receiving node. Claim 9 A polarization-interconnection canceller for a dual-polarization full-duplex transceiver, comprising: first and second RF transceivers interconnected via antennas, each comprising a duplexer, a transmitting node, a BN node, and a receiving node; and first and second magnetic interference cancellers disposed between the first and second RF transceivers and connecting the mutual BN nodes and receiving nodes of the first and second RF transceivers via first and second couplers. Claim 10 In claim 9, the polarization-inter-polarization self-interference canceller of a dual-polarization full-duplex transceiver is characterized in that the first and second RF transceivers implement a dual-polarization full-duplex transceiver based on vertical polarity (V POL) and horizontal polarity (H POL). Claim 11 In claim 9, the inter-polarization magnetic interference remover of a dual-polarization full-duplex transceiver is characterized in that the magnetic interference removal unit performs VH magnetic interference removal and HV magnetic indirect removal through the first and second magnetic interference removers.

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