KR20230016291A - Mimo based full duplex relaying termina having reverse noise floor reduction function - Google Patents

Abstract

In accordance with the present invention, a MIMO-based full duplex relay terminal having a reverse noise floor reduction function includes: a communication unit receiving a MIMO signal from a transmitting terminal through a receiving antenna and transmitting the MIMO signal to a receiving terminal through a transmitting antenna; a channel estimation unit estimating a first channel between a relaying terminal and the transmitting terminal and a second channel between the transmitting terminal and the receiving terminal, from the MIMO signal received including a MIMO interference component from the transmitting terminal, and a received signal including a self-interference signal received from the transmitting antenna; a calculation unit acquiring a cancellation matrix for cancelling the self-interference signal based on a singular value decomposition result about the second channel, and QR-decomposing a matrix of the first channel about the MIMO signal part in the received signal, and then multiplying the same by QH to acquire a Z matrix; a control unit, with respect to first to N^th rows of each of the cancellation matrix and the Z matrix, primarily selecting an m^th row (m={1,2,…,N}), in which the sum of interference components included in the same row between the two matrixes is the lowest, and repeating secondary to N^th operations of selecting an m^th row, in which the sum is the lowest, with respect to the two matrixes circulated after the deletion of the selected row; and a signal detection unit detecting an m^th transmission signal from a result of removing the m^th component of the self-interference signal and the MIMO interference component included in the m^th row of the MIMO signal from the received signal, while performing the detection operation sequentially from the primary to N^th selected rows to sequentially detect N transmitting signals. Therefore, the present invention is capable of reducing a reverse noise floor in a direction from a carried terminal to a relaying terminal.

Description

MIMO-based full-duplex relay terminal with reverse noise floor reduction function

The present invention relates to a MIMO-based full-duplex relay system, and more particularly, to a MIMO-based full-duplex relay terminal having a reverse noise floor reduction function.

In a wireless communication system, a multiple-input multiple-output (MIMO) system provides a higher channel capacity than a conventional single input single output (SISO) system with high bandwidth and power efficiency.

As such, MIMO technology is used as a key technology for achieving high band efficiency in communication standards such as Long-Term Evolution (LTE) and Wireless Fidelity (WiFi). In addition, cooperative relaying communication is an effective method of providing a wide range of communication and high transmission rate and reliability. A method of relay communication is classified into a full-duplex (FD) method and a half-duplex (HD) method.

The full-duplex relaying method can support up to twice the transmission rate than the half-duplex relaying method. Due to the power difference, a problem of interference cancellation occurs, and thus there is a problem of deterioration in transmission rate and reliability.

In addition, in the past, an interference signal included in a transmission signal of a transmitting terminal and a self-interference signal generated by a relay terminal itself have been independently removed, but a technique capable of simultaneously canceling these two interferences in a relay terminal is required.

Registered Patent No. 10-0610663 Optical fiber monitoring system using testing light wavelength Publication No. 10-2013-0029329 Distributed control type optical fiber monitoring method and measuring device Registered Patent No. 10-0829933 Method for detecting abnormalities in optical lines and instantaneous line switching in optical communication systems and optical signal transmission device accordingly Publication No. 10-1204-0039509 Optical communication network monitoring system

An object of the present invention is to provide a MIMO-based full-duplex relay terminal capable of reducing a reverse noise floor in a direction from a portable terminal to a relay terminal.

A MIMO-based full-duplex relay terminal having a reverse noise floor reduction function according to the present invention includes a communication unit for receiving a MIMO signal from a transmitting terminal through a receiving antenna and transmitting the MIMO signal to the receiving terminal through a transmitting antenna; From the received signal including the MIMO signal received from the transmitting terminal and the self-interference signal received from the transmitting antenna, a first channel between the relay terminal and the transmitting terminal, the transmitting antenna and the receiving signal a channel estimator for estimating a second channel between antennas; A cancellation matrix for canceling the self-interference signal is obtained based on a singular value decomposition result for the second channel, QR decomposition of the first channel matrix for the MIMO signal part in the received signal, and then multiplication by QH. an operation unit to obtain a Z matrix; For the first to Nth rows of each of the cancellation matrix and the Z matrix, the mth row (m={1,2,...,N}) in which the sum of the interference components included in the same row between the two matrices is the minimum a control unit that repeats an operation of first selecting, deleting and circularly rotating an operation of selecting an m-th row having the minimum sum of the two matrices, from the second to the Nth order; and detecting an m-th transmission signal from a result of removing the m-th row component of the self-interference signal and the MIMO interference component included in the m-th row of the MIMO signal from the received signal, and a signal detector for sequentially detecting N transmission signals by sequentially performing.

Preferably, the communication unit includes a power amplifier for amplifying a transmission signal, and a low-noise amplifier, wherein the power amplifier includes a first amplifying element and a second amplifying element, and an output transformer having a first coil and a second coil. One end of the first coil is connected to the output terminal of the first amplification element, the other end of the first coil is connected to the output terminal of the second amplification element, and one end of the second coil is connected to the power and a high-frequency module connected to an output terminal of the amplifier.

Preferably, a duplexer for passing a transmission signal and a reception signal of a first communication band is further provided, wherein the duplexer comprises a transmission filter having an input terminal connected to an output terminal of the power amplifier, and an input terminal connected to an output terminal of the transmission filter. It is characterized in that it has a receive filter connected to.

Preferably, the communication unit may include a high frequency signal processing circuit unit that processes a high frequency signal transmitted and received by the antenna 320; and a baseband signal processing circuit unit for signal processing using an intermediate frequency band of a lower frequency than a high frequency signal transmitted by the high frequency module.

According to the MIMO-based full-duplex relay terminal of the present invention, there is an advantageous effect of reducing the reverse noise floor in the direction from the portable terminal to the relay terminal.

1 is a diagram illustrating a full-duplex relay system based on MIMO according to an embodiment of the present invention.
2 shows the configuration of a relay terminal according to an embodiment of the present invention.
3 is a detailed configuration diagram of a high frequency module according to an embodiment of the present invention.

Prior to the detailed description of the present invention, the present invention may make various changes and may have various embodiments, and the examples described below and shown in the drawings are not intended to limit the present invention to specific embodiments. No, it should be understood to include all changes, equivalents or substitutes included in the spirit and scope of the present invention.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In addition, terms such as "...unit", "...unit", and "...module" described in the specification mean a unit that processes at least one function or operation, which is hardware, software, or hardware and It can be implemented as a combination of software.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

1 is a diagram illustrating a full-duplex relay system based on MIMO according to an embodiment of the present invention.

A full-duplex relay system based on MIMO according to an embodiment of the present invention includes a transmitting terminal 110 (S), a relay terminal 120 (R), and a receiving terminal 130 (D).

Here, FIG. 1 assumes an N×N MIMO system in which N antennas are respectively installed in the transmitting terminal 110, the relay terminal 120, and the receiving terminal 130. That is, the transmitting terminal 110 has N transmitting antennas, the relay terminal 120 has N transmitting antennas and N receiving antennas, respectively, and the receiving terminal 130 has N receiving antennas.

The transmission terminal 110 transmits N transmission signals (MIMO signals) through N transmission antennas, and the transmission signals are mixed after passing through the first channel (HSR) to the N reception antennas of the relay terminal 120, respectively. Received. The relay terminal 120 receives the MIMO signal sent by the transmitting terminal 110 through its own receiving antenna, and transmits the MIMO signal to the receiving terminal 130 through its own transmitting antenna.

Since the relay terminal 120 uses full-duplex communication, it performs an operation of receiving a MIMO signal from the transmitting terminal 110 and an operation of transmitting the MIMO signal to the receiving terminal 130 in the same time slot. During this process, self-interference occurs in the relay terminal 120 in which the MIMO signal transmitted to the receiving terminal 130 through the transmitting antenna flows into the receiving antenna.

In the embodiment of the present invention, there are two types of interference. One is MIMO-Interference through the first channel (HSR) between the transmission antenna of the transmission terminal 110 and the reception antenna of the relay terminal 120, and , the other is self-interference through the second channel (HRR) between the transmit antenna and the receive antenna of the relay terminal 120 itself.

The MIMO signal transmitted by the transmitting terminal 110 is received by the relay terminal 120 while passing through the first channel (HSR) while including the MIMO interference component. Accordingly, the MIMO signal received by the relay terminal 120 from the transmitting terminal 110 includes a MIMO interference (MIMOInterference) component.

The MIMO signal transmitted from the relay terminal 120 to the receiving terminal 130 is received by the receiving terminal 130 through the third channel (HSD), but flows into the receiving antenna through the second channel (HRR) to prevent self-interference. cause Hereinafter, the MIMO signal received through the second channel (HRR) of the relay terminal 120 is referred to as a self-interference signal. In this way, the reception antenna of the relay terminal 120 receives two interference components, that is, the MIMO signal transmitted by the actual transmission terminal 110, in addition to the MIMO signal (detection target signal) transmitted by the actual transmission terminal 110. A MIMO interference component and an internally generated self-interference signal are received together. The relay terminal 120 must be able to accurately detect MIMO signals (N transmission signals) sent by the transmitting terminal 110, and for this, must be able to effectively remove two interference components from the received signal of the receiving antenna. In an embodiment of the present invention, the relay terminal 120 adjusts the order of interference cancellation performed for each reception antenna according to the communication environment when the transmission terminal 110 detects a signal. The relay terminal 120 analyzes the received signal components of its N receiving antennas and sequentially detects the N transmitted signals in a corresponding order while sequentially removing interference from the receiving antenna having the smallest interference component.

For example, instead of simply detecting four transmission signals in the order of x1→x2→x3→x4 as in the prior art, four transmission signals may be sequentially detected in the order of x3→x1→x4→x2. In this way, the relay terminal 120 can sequentially detect transmission signals having corresponding numbers from the received signals from which the interference has been removed while removing the interference from the receiving antennas having the smallest interference component among the plurality of receiving antennas, that is, the receiving antenna having high reliability. there is.

2 shows the configuration of a relay terminal according to an embodiment of the present invention, and the relay terminal 120 includes a communication unit 210, a channel estimation unit 220, a calculation unit 230, a control unit 240, and a signal detection unit 250. ).

The communication unit 210 of the relay terminal 120 receives the MIMO signal from the transmitting terminal 110 through the receiving antenna and transmits the MIMO signal to the receiving terminal through the transmitting antenna.

Since the relay terminal 120 uses full-duplex communication, reception and transmission operations are simultaneously performed. In addition, the MIMO signal sent by the transmitting terminal 110 and the MIMO signal (hereinafter referred to as self-interference signal) sent to the receiving terminal 130 are introduced into the receiving antenna of the relay terminal 120 together. Of course, the MIMO signal sent by the transmitting terminal 110 includes a MIMO interference component.

In this way, the signal received by the reception antenna of the relay terminal 120 (hereinafter, the reception signal) is the 'MIMO signal' received from the transmission terminal 110 including the MIMO interference component, and the 'self' received from the transmission antenna of the relay terminal 120. contains 'interfering signals'

The channel estimator 220 calculates a channel between the relay terminal 120 and the transmission terminal 110 (HSR; first channel) and a channel between the transmission antenna and the reception antenna (HRR; second channel) from the received signal (Y). guess

The calculator 230 obtains an offset matrix related to the second channel and obtains a z matrix related to the first channel.

The control unit 240 determines the order of interference cancellation performed for each reception antenna of the relay terminal 120 using these two matrices. Specifically, the control unit 240 controls the m-th row (m={1,2, m={1,2, ...,N}) is first selected, and the operation of selecting the mth row with the minimum sum of the two matrices circularly rotated by deleting the selected row is repeated from the second to the Nth order.

The signal detector 250 detects the m-th transmission signal from the result of removing all of the m-th row component of the self-interference signal and the MIMO interference component included in the m-th row of the MIMO signal from the received signal, and selects the first to Nth order. It is sequentially performed in the order of rows to sequentially detect N transmission signals. According to this method, for example, all four transmission signals can be sequentially detected in the order of x3→x1→x4→x2.

3 is a circuit configuration diagram of a communication unit including a high frequency module according to an embodiment of the present invention.

The communication unit 210 including a high frequency module according to an embodiment of the present invention includes a high frequency module 310, an antenna 320, a high frequency signal processing circuit (RFIC) 330, and a baseband signal processing circuit (BBIC). ) (340).

The high frequency signal processing circuit unit 330 is a circuit that processes a high frequency signal transmitted and received by the antenna 320 . Specifically, the high-frequency signal processing circuit unit 330 signal-processes the received signal input through the reception path of the high-frequency module 310 by down-converting or the like, and converts the received signal generated by signal processing to the baseband signal processing circuit unit 340. ) is output to In addition, the high-frequency signal processing circuit unit 330 processes the transmission signal input from the baseband signal processing circuit unit 340 by up-converting or the like, and transmits the generated transmission signal through the signal processing to a transmission path of the high-frequency module 310. print out

The baseband signal processing circuit unit 340 is a circuit that processes signals using an intermediate frequency band of a lower frequency than the high frequency signal transmitted by the high frequency module 310 . The signal processed in the baseband signal processing circuit unit 340 is used as, for example, an image signal for image display or used as an audio signal for a call through a speaker.

In addition, the high frequency signal processing circuit unit 330 also has a function as a control unit that controls the connection of the switches 51, 52, 53 and 54 of the high frequency module 310 based on the frequency band used. Specifically, the high frequency signal processing circuit unit 330 switches the connections of the switches 51 to 54 of the high frequency module 310 by a control signal (not shown). The control unit may be formed outside the high frequency signal processing circuit unit 330, or may be formed on the high frequency module 310 or the baseband signal processing circuit unit 340, for example.

The antenna 320 is connected to the antenna connection terminal 110 of the high frequency module 310, radiates a high frequency signal output from the high frequency module 310, and receives and outputs a high frequency signal from the outside to the high frequency module 310. do.

3 is a detailed configuration diagram of a high frequency module according to an embodiment of the present invention.

As shown in FIG. 3, a high frequency module 310 according to an embodiment of the present invention includes an antenna connection terminal 110, power amplifiers 11 and 12, low noise amplifiers 21 and 22, and a transmission filter. 61T and 62T, receive filters 61R and 62R, filter 63, receive input matching circuit 40, matching circuits 71, 72 and 73, switches 51, 52, 53 and 54) and a diplexer 60.

The antenna connection terminal 110 is an example of an input/output terminal and is an antenna common terminal connected to the antenna 2 .

The power amplifier 11 amplifies high-frequency signals of the communication band A (first communication band) and the communication band B (second communication band) belonging to the first frequency band group input from the transmission input terminal 111 It is a differential amplification amplifier. In addition, the power amplifier 12 is a differential amplification type amplifier that amplifies a high frequency signal of a communication band (C) belonging to a second frequency band group having a different frequency from the first frequency band group input from the transmission input terminal 112. .

The low-noise amplifier 21 is an amplifier that amplifies high-frequency signals of the communication band (A) and the communication band (B) to low noise and outputs them to the reception output terminal 121. In addition, the low noise amplifier 22 is an amplifier that amplifies the high frequency signal of the communication band (C) to low noise and outputs it to the receiving output terminal 122 .

The transmission filter 61T is disposed on the transmission path AT connecting the power amplifier 11 and the antenna connection terminal 110, and among the transmission signals amplified by the power amplifier 11, the transmission band of the communication band A transmit signal of In addition, the transmission filter 62T is disposed in the transmission path BT connecting the power amplifier 11 and the antenna connection terminal 110, and among the transmission signals amplified by the power amplifier 11, the communication band B Passes the transmission signal in the transmission band.

The reception filter 61R is disposed in the reception path AR connecting the low noise amplifier 21 and the antenna connection terminal 110, and receives the communication band A among the reception signals input from the antenna connection terminal 110. Passes the received signal in the band. In addition, the reception filter 62R is disposed in the reception path BR connecting the low noise amplifier 21 and the antenna connection terminal 110, and among the reception signals input from the antenna connection terminal 110, the communication band B It passes the received signal of the reception band of

The transmit filter 61T and the receive filter 61R constitute a duplexer 61 having the communication band A as a pass band. The duplexer 61 transmits the transmission signal and the reception signal of the communication band A in a frequency division duplex (FDD) method. In addition, the transmission filter 62T and the reception filter 62R constitute a duplexer 62 having the communication band B as a pass band. The duplexer 62 transmits the transmission signal and the reception signal of the communication band (B) in the FDD method.

It is also preferable that each of the duplexers 61 and 62 be a multiplexer composed only of a plurality of transmit filters, a multiplexer composed only of a plurality of receive filters, or a multiplexer composed of a plurality of duplexers.

The filter 63 is disposed on the path connecting the switch 53 and the switch 54, passes the transmission signal of the communication band C among the transmission signals amplified by the power amplifier 11, and also the antenna connection terminal. Among the received signals inputted from (110), the received signals in the communication band (C) are passed. The filter 63 transmits the transmission signal and the reception signal of the communication band C by a time division duplex (TDD) method by the switching operation of the switch 53.

One end of the transmission path AT is connected to the transmission input terminal 111, and the other end of the transmission path AT is connected to the antenna connection terminal 110. One end of the transmission path BT is connected to the transmission input terminal 111, and the other end of the transmission path BT is connected to the antenna connection terminal 110. One end of the transmission path CT is connected to the transmission input terminal 112, and the other end of the transmission path CT is connected to the antenna connection terminal 110.

One end of the reception path AR is connected to the antenna connection terminal 110, and the other end of the reception path AR is connected to the reception output terminal 121. One end of the reception path BR is connected to the antenna connection terminal 110, and the other end of the reception path BR is connected to the reception output terminal 121. One end of the reception path CR is connected to the antenna connection terminal 110, and the other end of the reception path CR is connected to the reception output terminal 122.

One end of the transmit/receive path CTR is connected to the switch 53, and the other end of the transmit/receive path CTR is connected to the antenna connection terminal 110. That is, the transmit/receive path (CTR) includes a part of the transmit path (CT) and a part of the receive path (CR).

The receive input matching circuit 40 has matching circuits 41 and 42. The matching circuit 41 is disposed in the receiving path connecting the low noise amplifier 21 and the receiving filters 61R and 62R, and obtains impedance matching of the low noise amplifier 21 and the receiving filters 61R and 62R. The matching circuit 42 is disposed in the receiving path connecting the low noise amplifier 22 and the filter 63, and obtains impedance matching between the low noise amplifier 22 and the filter 63.

The switch 51 has a common terminal and two selection terminals. The common terminal of the switch 51 is connected to the output terminal 116 of the power amplifier 11. One selection terminal of the switch 51 is connected to the transmission filter 61T, and the other selection terminal of the switch 51 is connected to the transmission filter 62T. In this connection structure, the switch 51 switches the connection between the common terminal and one selection terminal, and the connection between the common terminal and the other selection terminal. That is, the switch 51 switches the connection between the power amplifier 11 and the transmission filter 61T and the connection between the power amplifier 11 and the transmission filter 62T. The switch 51 is constituted by, for example, a SPDT (Single Pole Double Throw) switch circuit.

The switch 52 has a common terminal and two selection terminals. The common terminal of the switch 52 is connected to the input terminal of the low noise amplifier 21 via a matching circuit 41. One selection terminal of the switch 52 is connected to the reception filter 61R, and the other selection terminal of the switch 52 is connected to the reception filter 62R. In this connection configuration, the switch 52 switches connection and disconnection between the common terminal and one selection terminal, and switches connection and disconnection between the common terminal and the other selection terminal. That is, the switch 52 switches connection and disconnection between the low noise amplifier 21 and the reception filter 61R, and switches connection and disconnection between the low noise amplifier 21 and the reception filter 62R. The switch 52 is constituted by, for example, an SPDT type switch circuit.

The switch 53 has a common terminal and two selection terminals. The common terminal of the switch 53 is connected to the filter 63. One selection terminal of the switch 53 is connected to the output terminal 126 of the power amplifier 12, and the other selection terminal of the switch 53 passes through the matching circuit 42 to the input terminal of the low noise amplifier 22. is connected to In this connection configuration, the switch 53 switches connection and disconnection between the common terminal and one selection terminal, and switches connection and disconnection between the common terminal and the other selection terminal. That is, the switch 53 switches connection and disconnection between the filter 63 and the power amplifier 12, and switches connection and disconnection between the filter 63 and the low noise amplifier 22. The switch 53 is composed of, for example, an SPDT type switching circuit.

The switch 54 is an example of an antenna switch, and is connected to the antenna connection terminal 110 through the diplexer 60, (1) the antenna connection terminal 110 and the transmission path (AT) and the reception path (AR) (2) connection of the antenna connection terminal 110 to the transmission path BT and reception path BR, and (3) connection of the antenna connection terminal 110 to the transmission/reception path CTR.

The matching circuit 71 is disposed on a path connecting the switch 54 and the duplexer 61, and obtains impedance matching between the antenna 2 and the switch 54 and the duplexer 61. The matching circuit 72 is disposed on a path connecting the switch 54 and the duplexer 62, and obtains impedance matching between the antenna 2 and the switch 54 and the duplexer 62. The matching circuit 73 is disposed on the path connecting the switch 54 and the filter 63, and performs impedance matching between the antenna 2, the switch 54, and the filter 63.

The diplexer 60 is an example of a multiplexer and is composed of filters 60L and 60H. The filter 60L is a filter having a frequency range including the first frequency band group and the second frequency band group as a pass band, and the filter 60H is a filter having a different frequency from the first frequency band group and the second frequency band group. It is a filter whose pass band is the frequency range that includes the frequency band group. One terminal of the filter 60L and one terminal of the filter 60H are connected to the antenna connection terminal 110 in common. Each of the filters 60L and 60H is an LC filter composed of at least one of, for example, a chip-shaped inductor and capacitor. In addition, when the first frequency band group and the second frequency band group are located on the lower frequency side than the other frequency band groups, the filter 60L may be a low-pass filter, and the filter 60H may be a high-pass filter. do.

In addition, the transmission filters 61T and 62T, the reception filters 61R and 62R, and the filter 63 are, for example, an acoustic wave filter using SAW (Surface Acoustic Wave) and an acoustic wave filter using BAW (Bulk Acoustic Wave). , LC resonance filters and dielectric filters may be used, but are not limited thereto.

Also, the matching circuits 41, 42 and 71 to 73 are not essential components of the high frequency module according to the present invention.

In the configuration of the high frequency module 1, the power amplifier 11, the switch 51, the transmission filter 61T, the matching circuit 71, the switch 54 and the filter 60L connect the antenna connection terminal 110. A first transmission circuit is configured to transmit a transmission signal of the communication band (A) to the destination. In addition, the filter 60L, switch 54, matching circuit 71, receiving filter 61R, switch 52, matching circuit 41 and low noise amplifier 21 are connected from the antenna 2 to the antenna connection terminal ( 110) constitutes a first receiving circuit that transmits the received signal of the communication band (A).

Further, the power amplifier 11, switch 51, transmission filter 62T, matching circuit 72, switch 54, and filter 60L are directed toward the antenna connection terminal 110 to transmit the communication band B. A second transmission circuit for transmitting a signal is constituted. In addition, the filter 60L, switch 54, matching circuit 72, receiving filter 62R, switch 52, matching circuit 41 and low noise amplifier 21 are connected from the antenna 2 to the antenna connection terminal ( 110) constitutes a second receiving circuit that transmits the received signal of the communication band (B).

In addition, the power amplifier 12, switch 53, filter 63, matching circuit 73, switch 54 and filter 60L direct the antenna connection terminal 110 to transmit signals of the communication band C. configures a third transmission circuit that transmits In addition, the filter 60L, the switch 54, the matching circuit 73, the filter 63, the switch 53, the matching circuit 42, and the low noise amplifier 22 are connected from the antenna 2 to the antenna connection terminal 110. ) to configure a third receiving circuit for transmitting the received signal of the communication band (C).

According to the above circuit configuration, the high frequency module 1 simultaneously transmits, simultaneously receives, and simultaneously transmits, simultaneously transmits, simultaneously receives and transmits a high frequency signal of any one of the communication bands (A) and (B) and a high frequency signal of the communication band (C). It is possible to execute at least one of transmission and reception.

In addition, in the high frequency module according to the present invention, the three transmission circuits and the three reception circuits need not be connected to the antenna connection terminal 110 via the switch 54, and the three transmission circuits and the three reception circuits do not have to be connected. It is also preferable that the circuit is connected to the antenna 2 via different terminals. Further, the high frequency module according to the present invention preferably has at least one of the first transmission circuit, the second transmission circuit, and the third transmission circuit.

In the high frequency module according to the present invention, it is preferable that the first transmission circuit has at least one of the power amplifier 11, transmission filter 61T, switch 54 and filter 60L. It is also preferable that the second transmission circuit has at least one of the power amplifier 11, transmission filter 62T, switch 54 and filter 60L. It is also preferable that the third transmission circuit has at least one of the power amplifier 12, the filter 63, the switch 54 and the filter 60L.

It is also preferable that the low-noise amplifiers 21 and 22 and the switches 51 to 54 be formed in one semiconductor IC (Integrated Circuit). It is also preferable that the semiconductor IC further includes power amplifiers 11 and 12.

The embodiments described in this specification and the accompanying drawings merely illustrate some of the technical ideas included in the present invention by way of example. Therefore, since the embodiments disclosed in this specification are not intended to limit the technical idea of the present invention but to explain it, it is obvious that the scope of the technical idea of the present invention is not limited by these embodiments. All modified examples and specific examples that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

110: transmitting terminal
120: relay terminal
130: receiving terminal
210: communication department
220: channel estimation unit
230: calculation unit
240: control unit
250: signal detection unit

Claims (4)

a communication unit for receiving the MIMO signal from the transmitting terminal through the receiving antenna and transmitting the MIMO signal to the receiving terminal through the transmitting antenna;
From the received signal including the MIMO signal received from the transmitting terminal and the self-interference signal received from the transmitting antenna, a first channel between the relay terminal and the transmitting terminal, the transmitting antenna and the receiving signal a channel estimator for estimating a second channel between antennas;
A cancellation matrix for canceling the self-interference signal is obtained based on a singular value decomposition result for the second channel, QR decomposition of the first channel matrix for the MIMO signal part in the received signal, and then multiplication by QH. an operation unit to obtain a Z matrix;
For the first to Nth rows of each of the cancellation matrix and the Z matrix, the mth row (m={1,2,...,N}) in which the sum of the interference components included in the same row between the two matrices is the minimum a control unit that repeats an operation of first selecting, deleting and circularly rotating an operation of selecting an m-th row having the minimum sum of the two matrices, from the second to the Nth order; and
An m-th transmission signal is detected from a result of removing the m-th row component of the self-interference signal and the MIMO interference component included in the m-th row of the MIMO signal from the received signal, in the order of the first to Nth selected rows. A signal detector for sequentially detecting N transmission signals by sequentially performing
A MIMO-based full-duplex relay terminal having a reverse noise floor reduction function comprising a.
The method of claim 1,
The communication unit includes a power amplifier for amplifying a transmission signal and a low-noise amplifier, wherein the power amplifier has a first amplifying element and a second amplifying element, and an output transformer having a first coil and a second coil, One end of the first coil is connected to the output terminal of the first amplification element, the other end of the first coil is connected to the output terminal of the second amplification element, and one end of the second coil is connected to the output terminal of the power amplifier. A MIMO-based full-duplex relay terminal having a reverse noise floor reduction function, characterized in that it comprises a high-frequency module connected to the.
The method of claim 2,
Further comprising a duplexer for passing a transmission signal and a reception signal of a first communication band, the duplexer comprising: a transmission filter having an input terminal connected to an output terminal of the power amplifier, and a reception filter having an input terminal connected to an output terminal of the transmission filter. A MIMO-based full-duplex relay terminal having a reverse noise floor reduction function, characterized in that it has a filter.
The method according to claim 3, wherein the communication unit,
a high-frequency signal processing circuit unit for processing a high-frequency signal transmitted and received by the antenna 320; and
A baseband signal processing circuit unit for signal processing using an intermediate frequency band of a lower frequency than the high frequency signal transmitted by the high frequency module.
A MIMO-based full-duplex relay terminal having a reverse noise floor reduction function further comprising.

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