KR102455651B1 - Full-duplex transceiver and relay apparatus using the transceiver - Google Patents

Abstract

Disclosed is a full-duplex relay device that forms a plurality of transmit beams and a plurality of receive beams using millimeter waves. A full-duplex relay apparatus according to an embodiment of the present invention includes: a radio frequency (RF) transmitter for providing a plurality of signals for forming a plurality of transmission beams to an antenna by adjusting the phases of signals separated into a plurality of baseband-processed signals; an RF receiver that receives a signal input from an antenna and adjusts a phase of the received signal to be different from a phase of a signal output by the RF transmitter; and an antenna array including a plurality of patches to which power is applied from different directions, each patch being connected to the RF transmitter and the RF receiver to form a plurality of directional beams.

Description

FULL-DUPLEX TRANSCEIVER AND RELAY APPARATUS USING THE TRANSCEIVER

The present invention relates to a full-duplex transmission/reception device and a relay using the full-duplex transmission/reception device, and more particularly, to a full-duplex transmission/reception device for a wireless communication system using a millimeter wave and a relay using the full-duplex transmission/reception device.

As one of the technologies required for 5G mobile communication construction, a beamforming technology using a plurality of antenna arrays in the millimeter wave band has been developed. On the other hand, in order to increase cell capacity, a full-duplex method for simultaneously transmitting and receiving in the same band is being studied. The current beamforming technology has an effect of compensating for the high path loss that occurs in millimeter wave band wireless communication, but if there is an object with low radio wave permeability such as a human body in the path between the base station and the terminal, the path loss is 20dB or more There is a problem in that the quality of the received signal decreases. A wireless relay or repeater is used as a method for reducing the attenuation of such a signal and extending a cell radius, and research on applying a full-duplex (IFD) method to increase the communication capacity of a conventional relay is in progress.

The core of the full-duplex method is to remove the self-interference signal generated by directly applying a high-output transmission signal to the receiving unit. (Finite Impulse Response) A test system is implemented by adding a filter and adding a separate transmission path to subtract the transmission signal from the received signal. When the technology is implemented as an integrated circuit chip by additionally using an RF modulator, a DA converter, etc., the area increases, and accordingly, the cost and power consumption increase, and thus there is a problem of poor compatibility.

As another example of the prior art, in order to partially remove the self-interference signal from the RF region, there is a technique for configuring an RF FIR filter including a plurality of time delay elements, a power divider, a combiner, and the like. In the case of , the area is considerably larger than that of the transceiver chip, and when the carrier frequency is high, such as in a millimeter wave band, there is a problem in that the performance of the circulator and the time delay device is deteriorated.

It is an object of the present invention to solve the above problems, to provide a full-duplex transceiver.

Another object of the present invention to solve the above problems is to provide a relay including the full-duplex transceiver.

A full-duplex transceiver according to an embodiment of the present invention for achieving the above object forms a plurality of transmit beams and a plurality of receive beams using millimeter waves, and adjusts phases of signals separated into a plurality of baseband-processed signals. a radio frequency (RF) transmitter providing a plurality of signals for forming a plurality of transmission beams to an antenna; an RF receiver that receives a signal input from an antenna and adjusts a phase of the received signal to be different from a phase of a signal output by the RF transmitter; and an antenna array including a plurality of patches to which power is applied from different directions, each patch being connected to the RF transmitter and the RF receiver to form a plurality of directional beams.

The RF receiver may include a reception-side phase shifter array configured to perform phase shifting on the plurality of reception beams, and each phase shifter of the reception-side phase shifter array performs phase shifting on individual reception beams. can do.

The RF transmitter may include a transmission-side phase shifter array configured to perform phase shifting with respect to the plurality of transmission beams, and each phase shifter of the transmission-side phase shifter array may perform phase shifting for individual transmission beams. can

The signal formed by the phase shifter on the transmission side and the signal formed by the phase shifter on the reception side may have a phase difference of 20° to 150°.

The full-duplex transceiver includes: a baseband modem for processing a baseband signal; a first converter converting a digital signal output from the baseband modem into an analog signal and providing the converted digital signal to the RF transmitter; and a second converter that converts the analog signal output from the RF receiver into a digital signal and provides the converted analog signal to the baseband modem.

The method may further include an analog self-interference cancellation (SIC) module that performs self-interference cancellation on the signal output from the first converter and provides the same to the second converter.

The baseband modem may further include a digital self-interference cancellation module.

The antenna array may include a plurality of patch antennas that are fed from two different directions to generate a dual polarization signal.

A full-duplex relay device according to an embodiment of the present invention for achieving the above other object, a communication module; and a processor that determines the directions of the downlink transmit beam and the uplink receive beam according to the position of the base station and the position of the terminal, and controls the communication module to form a beam according to the determined direction.

The communication module may include: a radio frequency (RF) transmitter configured to provide a signal for forming a plurality of transmission beams to an antenna by adjusting a phase of a baseband-processed signal separated into a plurality of signals; a radio frequency (RF) receiver that receives a signal input from the antenna and adjusts a phase of the received signal to be different from a phase of a signal output by the RF transmitter; and an antenna array including a plurality of patches to which power is applied from different directions, each patch being connected to the RF transmitter and the RF receiver to form a plurality of directional beams.

The processor controls each phase shifter so that an incident direction of a reception beam formed by a phase shifter control of an RF receiver in the communication module is different from a radiation direction of a transmission beam formed by a phase shifter of an RF transmitter in the communication module can do.

According to the embodiments of the present invention as described above, there is provided an RF structure that can efficiently implement a wireless relay in order to solve the problem of radio wave attenuation (human blockage) and radio wave shadow area caused by the human body, etc. occurring in millimeter wave band wireless communication can do.

In addition, a full-duplex relay or repeater that can solve the problem of reduced frequency utilization efficiency of the conventional relay or Wi-Fi extender and the increase in chip area and cost caused by using a dual-band transceiver can be implemented with low complexity and cost. .

1 is a block diagram of a typical full-duplex transceiver.
2 is a detailed block diagram of a full-duplex transceiver according to an embodiment of the present invention.
3 illustrates an antenna patch arrangement included in a full-duplex relay device according to an embodiment of the present invention.
4 is a diagram illustrating a shape of a beam formed for transmission and reception in a communication system using a relay device according to an embodiment of the present invention.
5 is a conceptual diagram of a communication system in which a relay device according to an embodiment of the present invention is utilized.
6 is a block diagram of a relay device according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

Terms such as first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term "and/or" includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, 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 a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a typical full-duplex transceiver.

The full-duplex transmission/reception device shown in FIG. 1 includes two paths of transmission processing elements starting from a main TX baseband processor 10 and an auxiliary TX baseband processor 20 .

First, Orthogonal Frequency Division Multiplexing (OFDM) data is provided to the transmitter baseband processor 10 . This signal forms the basis of the primary transmit signal propagating between the transmit and receive antennas with low coupling. The TX baseband processor 10 generates an OFDM symbol for transmission and transmits it to the pre-processing unit 11 . The pre-processing unit 11 multiplies the OFDM symbol by the transfer function H2 and outputs it. This signal is converted into a time domain signal and passed through a digital-to-analog converter 12 . The signal output from the digital-to-analog converter 12 is converted into an RF signal by the RF modulator 13 , amplified by the power amplifier 14 , and finally transmitted via the antenna 30 .

Meanwhile, with respect to the auxiliary transmission channel, OFDM data is provided to the auxiliary TX baseband processor 20 . Similar to the main transmit chain, the auxiliary preprocessor 21 may change the OFDM symbol by a transfer function (-H1). The output of the auxiliary preprocessor 21 is provided to a digital-to-analog converter 22 , via an RF modulator 23 to generate a self-interference cancellation signal.

The self-interference signal included in the signal input through the transceiver terminal is combined with the self-interference cancellation signal by the RF adder 41 . The self-interference signal is substantially reduced by the negative contribution of the self-interference cancellation signal by the RF adder 41 . Thereafter, the signal passes through an RF demodulator 42 and is sampled by an analog-to-digital converter 43 . The sampled signal is processed by an RX baseband processor 44 . The RX baseband processor 45 generates OFDM symbols by performing FFT.

As shown in FIG. 1, the self-interference cancellation (SIC) used in a general full-duplex transmission/reception method is a block 30 such as a symmetric antenna with low coupling between transmission and reception, and a transmission signal is copied and modulated (23). It is implemented using a block 41 or the like that is then merged with the received signal. That is, a portion of the transmission signal is removed from the front end of the low noise amplifier so that the strong transmission signal output from the power amplifier 14 is directly input to the receiving unit and thus the sensitivity of the receiving unit low noise amplifier is not reduced.

A typical full-duplex transceiver also requires additional use of the RF modulator 13 , the DA converter 12 , and the like, so that when implemented as an integrated circuit chip, the chip area increases, and accordingly, the cost and power consumption also increase.

2 is a detailed block diagram of a full-duplex transceiver according to an embodiment of the present invention.

The full-duplex transceiver or relay device according to an embodiment of the present invention can separate a transmit beam and a receive beam in a system using a beamforming antenna and effectively remove a self-interference signal by using a low complexity structure.

To this end, the full-duplex transmission/reception apparatus 100 according to an embodiment of the present invention largely includes a baseband modem 110 , a beamforming (BF) transceiver 130 , an impedance controller 140 , and a patch antenna array 150 . may include The full-duplex transceiver 100 may additionally include an ADC 123 , a DAC 121 , and an analog Self Intererence Cancellation (SIC) module 122 .

The beamforming transceiver 130 may include an RF transmitter, an RF receiver, and a phase locked loop (PLL) frequency synthesizer.

The RF transmitter may include an up-converter (Tx up-converter) 131 , a power divider 132 , an RF variable amplifier 133a , a phase shifter array 134a , and a PA array 135a . The output of each PA is connected to an individual patch antenna constituting the antenna array 150 . In addition, the RF receiver includes an LNA array 135b and a phase shifter array 134b in which four or more LNAs (Low Noise Amplifier) are arranged in parallel, an RF variable amplifier 133b, a combiner 137, and a downconverter 136 .

In detail, the down-converter (Rx down-converter) 136 of the RF receiver may include a down-conversion mixer, an analog channel filter, and a variable-gain amplifier (VGA), and a selected intermediate frequency (IF). ) If the frequency is several GHz or more, an additional downconversion mixer and filter may be included. In detail, the up-converter 131 of the transmitter includes an analog channel filter and an up-conversion mixer, and like the receiver, an up-converter mixer may be added one more stage according to the selected IF frequency.

In the present invention, each phase shifter is controlled so that the incident direction of the reception beam formed by the phase shifter 134b of the reception unit is different from the radiation direction of the transmission beam formed by the phase shifter 134a of the transmission unit. The receive beam formed by the phase shifter 134b of the receiver and the transmit beam formed by the phase shifter 134a of the transmitter may have, for example, a phase difference of 20° to 150°.

Therefore, even if the transmitter and the receiver operate in the same frequency band by the full-duplex method, each PA output passes through the phase shifter 134b of the receiver, and the phases of the transmit path and the receive path are different, so that the combiner (137) output is reduced by more than 20dB.

Also, referring to FIG. 2 , the antenna 150 may include an array 151 of a plurality of small patch antennas and an individual impedance adjuster 152 for adjusting the impedance of the individual antennas. The impedance controller 140 controls the impedance of each antenna through the individual impedance adjuster 152 .

As a configuration example of the antenna according to the present invention, an embodiment of a millimeter wave band antenna is shown in FIG. 3 .

3 illustrates an antenna patch arrangement included in a full-duplex relay device according to an embodiment of the present invention.

The antenna structure of FIG. 3 shows, inter alia, an example of an antenna 200 composed of four patch arrays (antenna patch 11 , antenna patch 12 , antenna patch 21 , antenna patch 22 ). Each patch may be spaced apart such that the center-to-center spacing of the patches is, for example, 5.26 mm. If the antenna structure as shown in FIG. 3 is repeatedly arranged vertically, horizontally and vertically, an antenna composed of arbitrary N patches may be configured.

The patch antenna can be implemented by forming the pattern 201 on the top metal layer of a multilayer printed circuit board (PCB) composed of FR4, etc., and forming the ground plane 202 on the bottom metal layer. . Feeding to the antenna is applied in two directions of the X-direction 203 and the Y-direction 204 for each patch element to generate a dual-polarization signal. Each of the terminals of the antenna patch is connected to the output of the PA 135a and the input of the LNA 135b of the beamforming transceiver 130 .

Here, FR-4 represents a NEMA grade designation for a glass-reinforced epoxy laminate material as a composite material composed of a woven fiberglass cloth with a fire-resistant (self-extinguishing) epoxy resin binder. "FR" means flame retardant.

In addition, since each patch antenna constituting the antenna array 151 in an embodiment of the present invention has a dual polarization structure, when the output of the transmit PA 135a is applied to the LNA 135b of the receiving unit, signal attenuation of about 30 to 40 dB is Occurs. Therefore, it is possible to obtain a self-interference signal rejection rate of about 50 to 60 dB as a whole in RF.

Additionally, a self-interference signal rejection ratio of 100 dB or more is generally required to minimize reception reduction performance degradation in the full-duplex method. To this end, as shown in FIG. 2 in the present invention, an analog SIC 122 may be added to the front end of the ADC 123 or a digital SIC block may be additionally included in the baseband modem 110 . Since the analog SIC 122 can be implemented as a separate module outside the RF transceiver 130 , a design change of an existing RF chip is not required. As described above, in the prior art, a separate transmission path or an RF FIR filter circuit must be added to the PA output terminal for self-interference cancellation, but in the present invention, the self-interference cancellation effect is achieved while using the general beamforming transceiver chip 130 as it is can be obtained

4 is a diagram illustrating a shape of a beam formed for transmission and reception in a communication system using a relay device according to an embodiment of the present invention.

The wireless communication network considered in the present invention may include a base station or AP 400 , a relay 100 , and a terminal 300 using millimeter waves. 4 is for explaining the magnetic interference cancellation effect of the relay device according to the present invention and the operation process of the relay according to an embodiment of the present invention.

A base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a Node B (node B), an advanced node B (eNodeB) , an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR)-BS, a relay station serving as a base station, RS), a relay node serving as a base station (relay node, RN), an advanced relay station serving as a base station (ARS), a high reliability relay station serving as a base station (high reliability relay station, HR-RS) ), small base station (femto base station (femotoBS), home node B (home node B, HNB), home eNodeB (HeNB), pico base station (pico BS), metro base station (metro BS), micro base station (micro BS), etc.) and the like, and may include all or some functions of ABS, NodeB, eNodeB, AP, RAS, BTS, MMR-BS, RS, RN, ARS, HR-RS, small base station, and the like.

In addition, the base station may refer to a base station such as a macro cell, a remote radio head (RRH) cell, a pico cell, a micro cell, a femto cell, etc. depending on the type of cell. .

A terminal is a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station (HR-MS), a subscriber station ( Subscriber station (SS), portable subscriber station (PSS), access terminal (AT), user equipment (UE), etc. may refer to, MT, MS, AMS, HR-MS , SS, PSS, AT, UE, etc. may include all or some functions.

Communication between the base station (or AP) and the terminal is performed by various radio access technologies (RATs) (eg, 4G communication technology, 5G communication technology, wireless broadband (WiBro) technology, wireless local area network (WLAN) technology, wireless personal area network) technology, etc.).

Referring to FIG. 4 , the relay 100 receives a signal transmitted by a base station or an access point (AP) 400 , and is caused by a building or a human blockage between the base station 400 and the terminal 300 . When the radio wave attenuation is severe, the signal received from the base station is reproduced, amplified, and retransmitted to the terminal without degrading the signal to noise ratio (SNR).

Conventional relay or Wi-Fi extender (Extender) uses a method of differentiating the frequency band used for the link between the AP 400 and the relay and the frequency band used for the link between the terminal 300 and the relay, and this results in frequency efficiency This resulted in a reduction of 1/2. In addition, since the RF transceiver must have a dual-band structure in which a transceiver is configured for each frequency band in order to process signals of two bands at the same time, the chip area is doubled, thereby increasing the cost.

On the other hand, the relay according to the present invention sets the direction of the beam transmitted from the base station 400 to the relay in the downlink differently from the direction of the beam transmitted from the relay 100 to the terminal 300 . In addition, according to the present invention, transmission and reception can be simultaneously performed at the same frequency by different polarization directions in the transmission processing and reception processing. This is because the attenuation of the transmission beam compared to the reception beam is large in the process of the signal passing through the phased array RF receiver (133b, 134b, 135b, 137 in FIG. 2), and additional attenuation occurs by the dual polarization antenna, so that the magnetic field required by the full-duplex method This is because an interference cancellation rate can be obtained.

According to another embodiment of the present invention, by configuring a beamforming-based radio repeater consisting only of the RF transceiver 130 and the antenna array 150 of the above-described structure and signal processing method without the baseband modem 110, a lower cost system can be implemented.

5 is a conceptual diagram of a communication system in which a relay device according to an embodiment of the present invention is utilized.

5 shows a representative application example of a millimeter wave band to which a wireless relay is applied. Referring to Figure 5, a general AP or small cell base station 400 may operate as a main transmitter (main transmitter) in the downlink. A user's virtual reality (VR) head mounted display (HMD) device may operate as a terminal.

The wireless relays 100 - 1 and 100 - 2 according to the present invention may receive the transmission signal of the base station 400 and retransmit the signal to the terminal in the radio wave shadow area. A signal transmitted to the terminal through the relay has a delay compared to when the terminal directly receives a signal from the base station, for example, a delay of 1 ms or less may occur. In addition, as shown in FIG. 5 , it is preferable that the downlink in which the relay transmits a signal to the terminal is in a different direction from the downlink in which the main transmitter transmits a signal to the relay. That is, by setting the directions of the transmission beam and the reception beam of the relay differently, an environment more suitable for simultaneous transmission and reception of the relay is provided.

In the millimeter wave band, the directivity of radio waves and the attenuation of radio waves by the human body are strong, so that many radio wave shadow areas occur even in an indoor environment. It is possible to solve such a radio wave shadow area problem.

6 is a block diagram of a relay device according to an embodiment of the present invention.

Referring to FIG. 6 , the relay device according to an embodiment of the present invention may include a processor 610 , a memory 620 , and a communication module 630 .

The communication module 630 may include the same blocks as the full-duplex transceiver according to the embodiment of the present invention described above and perform the same operation.

Specifically, the communication module 630 forms a plurality of transmit beams and a plurality of receive beams using millimeter waves, and adjusts phases of signals separated into a plurality of signals by baseband processing to form a plurality of transmit beams. RF (Radio Frequency) transmitter for providing an antenna; a radio frequency (RF) receiver that receives a signal input from an antenna and adjusts a phase of the received signal to be different from a phase of a signal output by the RF transmitter; and an antenna array including a plurality of patches to which power is applied from different directions, each patch being connected to the RF transmitter and the RF receiver to form a plurality of directional beams.

In addition, the processor 610 determines the direction of the downlink transmit beam and the uplink receive beam according to the position of the base station / AP and the position of the terminal, and controls the communication module 630 to form a beam according to the determined direction. can do. More specifically, the processor 610 controls the incident direction of the reception beam formed by the phase shifter control of the RF receiver in the communication module 630 and the radiation of the transmission beam formed by the phase shifter of the RF transmitter in the communication module 630 . Each phase shifter may be controlled to have different directions. For example, the receive beam and the transmit beam may have a phase difference of, for example, 20° to 150°.

The memory 620 may store at least one command executed by the processor and a result of command execution.

The operation of the method according to the embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all types of recording devices in which data readable by a computer system is stored. In addition, the computer-readable recording medium may be distributed in a network-connected computer system to store and execute computer-readable programs or codes in a distributed manner.

In addition, the computer-readable recording medium may include a hardware device specially configured to store and execute program instructions, such as ROM, RAM, and flash memory. The program instructions may include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

Although some aspects of the invention have been described in the context of an apparatus, it may also represent a description according to a corresponding method, wherein a block or apparatus corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also represent a corresponding block or item or a corresponding device feature. Some or all of the method steps may be performed by (or using) a hardware device such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

In embodiments, a programmable logic device (eg, a field programmable gate array) may be used to perform some or all of the functionality of the methods described herein. In embodiments, the field programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

100: full-duplex transceiver/relay 110: baseband modem
130: BF transceiver 140: impedance controller
150: antenna 200: patch antenna
300: terminal 400: base station / AP

Claims (10)

A full-duplex transceiver for forming a plurality of transmit beams and a plurality of receive beams using a millimeter wave, comprising:
a radio frequency (RF) transmitter for providing second signals for forming the plurality of transmission beams to a plurality of patch antennas by adjusting the phases of the baseband-processed and separated first signals;
an RF receiver receiving third signals input from the plurality of patch antennas and adjusting phases of the received third signals to be different from phases of the second signals output by the RF transmitter; and
An antenna array comprising the plurality of patch antennas, each of the plurality of patch antennas being connected to the RF transmitter and the RF receiver to form a plurality of directional beams,
wherein each of the plurality of patch antennas is fed from two different directions to generate a dual polarization signal when each of the plurality of patch antennas performs a transmission operation. The method according to claim 1,
The RF receiver,
a receiving-side phase shifter array configured to perform phase shifting on the plurality of receive beams;
and each phase shifter of the receiving-side phase shifter array performs a phase shift on an individual receive beam. 3. The method according to claim 2,
The RF transmitter is
and a transmission-side phase shifter array configured to perform phase shifting on the plurality of transmission beams,
and each phase shifter of the transmission-side phase shifter array performs a phase shift for an individual transmission beam. 4. The method of claim 3,
The signal formed by the phase shifter on the transmission side and the signal formed by the phase shifter on the reception side have a phase difference of 20° to 150°. The method according to claim 1,
a baseband modem for processing baseband signals;
a first converter converting a digital signal output from the baseband modem into an analog signal and providing the converted digital signal to the RF transmitter; and
and a second converter that converts the analog signal output from the RF receiver into a digital signal and provides the converted analog signal to the baseband modem. 6. The method of claim 5,
and an analog self-interference cancellation (SIC) module that performs self-interference cancellation on the signal output from the first converter and provides the signal to the second converter. 6. The method of claim 5,
The baseband modem further comprises a digital self-interference cancellation module. delete communication module; and
A full-duplex relay device comprising a processor for determining directions of a transmission beam of a downlink and a reception beam of an uplink according to a position of a base station and a position of a terminal, and controlling the communication module to form a beam according to the determined direction,
The communication module is
a radio frequency (RF) transmitter that provides second signals for forming a plurality of transmission beams to a plurality of patch antennas by adjusting phases of the first signals that are baseband-processed and separated into a plurality of first signals;
a radio frequency (RF) receiver that receives third signals input from the plurality of patch antennas and adjusts phases of the received third signals to be different from phases of the second signals output by the RF transmitter; and
An antenna array comprising the plurality of patch antennas, each of the plurality of patch antennas being connected to the RF transmitter and the RF receiver to form a plurality of directional beams,
When each of the plurality of patch antennas performs a transmission operation, each of the plurality of patch antennas is fed from two different directions to generate a double polarized signal. 10. The method of claim 9,
The processor is
Full duplex, controlling each phase shifter so that an incident direction of a reception beam formed by the phase shifter control of the RF receiver in the communication module and a radiation direction of a transmission beam formed by a phase shifter of the RF transmitter in the communication module are different relay device.

Images