KR20130064240A - Apparatus and method for relaying signal in communication system - Google Patents

Apparatus and method for relaying signal in communication system Download PDF

Info

Publication number
KR20130064240A
KR20130064240A KR1020110130764A KR20110130764A KR20130064240A KR 20130064240 A KR20130064240 A KR 20130064240A KR 1020110130764 A KR1020110130764 A KR 1020110130764A KR 20110130764 A KR20110130764 A KR 20110130764A KR 20130064240 A KR20130064240 A KR 20130064240A
Authority
KR
South Korea
Prior art keywords
signal
auxiliary
input signal
interference
power
Prior art date
Application number
KR1020110130764A
Other languages
Korean (ko)
Inventor
천병진
Original Assignee
청주대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 청주대학교 산학협력단 filed Critical 청주대학교 산학협력단
Priority to KR1020110130764A priority Critical patent/KR20130064240A/en
Publication of KR20130064240A publication Critical patent/KR20130064240A/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H04B7/15585—Relay station antennae loop interference reduction by interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Relay Systems (AREA)

Abstract

The present invention relates to an apparatus and method for relaying signals by minimizing signal interference in a wireless communication system. The present invention relates to a method for receiving an input signal from a transmitter through a receiving antenna, amplifying the input signal to a predetermined power level, and amplifying the signal. The received input signal to the receiver through the transmission antennas, and self-interference generated by the amplified input signal transmitted through the transmission antennas is spatial-domain interference nulling (SDIN). Is removed in a manner.

Description

Apparatus and method for relaying signal in communication system

The present invention relates to a communication system, and more particularly, to an apparatus and method for relaying a signal by minimizing signal interference in a wireless communication system.

In the current communication system, active researches are being conducted to provide users with services of various quality of service (QoS) having a high transmission speed (hereinafter referred to as 'QoS'). As an example of such a communication system, researches on methods for rapidly and stably transmitting a large amount of data through limited resources have been actively conducted. In particular, in a communication system, researches on data transmission through a wireless channel have been conducted. Recently, methods for transmitting and receiving a large amount of data normally by effectively using a limited wireless channel have been proposed.

Meanwhile, in a communication system, when link capacity is limited due to channel environment and distance limitation between a transmitter and a receiver, methods for extending a communication distance using a repeater or improving reception performance at a receiver have been proposed. . Here, the repeater retransmits the data received from the transmitter to the receiver in an amplify and forward (AF) and decode and forward method.

In particular, a repeater for relaying signals in the AF method is widely used in relaying signals in a communication system because of its economical advantages due to its simple structure. However, there is a problem in that interference of a signal generated when the repeater relays a signal in the AF method, in particular, interference caused by the repeater itself, that is, self-interference occurs. In other words, when the repeater amplifies the input signal received through the receiving antenna and then transmits through the transmitting antenna, the transmission signal transmitted through the transmitting antenna is an interference signal to the input signal received through the receiving antenna. In particular, since the transmission signal is a power amplified signal to a predetermined level, it acts as a very large interference signal to the input signal.

The interference signal generated by the repeater itself, such as an echo signal, degrades the signal relay performance of the repeater, and in particular, since the repeater does not normally relay the signal between the transmitter and the receiver, the transmitter and receiver cannot normally transmit and receive the signal. There is a problem.

Accordingly, there is a need for a method of relaying a signal normally by minimizing an interference signal at a repeater so that a signal transmission and reception between a transmitter and a receiver are normally performed in a communication system such as a wireless communication system.

Accordingly, an object of the present invention is to provide a signal relay apparatus and method in a communication system.

Another object of the present invention is to provide an apparatus and method for relaying a signal to normally transmit and receive a signal between a transmitter and a receiver by minimizing an interference signal when relaying a signal transmitted and received between a transmitter and a receiver in a communication system.

In addition, another object of the present invention is to provide an apparatus and method for relaying a signal between a transmitter and a receiver by minimizing interference by a signal transmitted to the receiver when relaying a signal received from a transmitter to a receiver in a communication system. In providing.

An apparatus of the present invention for achieving the above objects, the apparatus for relaying a signal in a communication system, comprising: a receiving antenna for receiving an input signal received from a transmitter; A power amplifier for amplifying the input signal to a predetermined power level; And transmit antennas for transmitting the amplified input signal to a receiver; The reception antenna is configured such that self-interference caused by the amplified input signal transmitted through the transmission antennas is removed in a spatial-domain interference nulling (SDIN) scheme, thereby receiving the input signal. Receive

According to an aspect of the present invention, there is provided a method of relaying a signal in a communication system, the method comprising: receiving an input signal from a transmitter through a receiving antenna; Amplifying the input signal to a predetermined power level; And transmitting the amplified input signal to a receiver via transmit antennas; In the receiving step, the self-interference generated by the amplified input signal transmitted through the transmitting antennas is removed by a spatial-domain interference nulling (SDIN) method, and thus the input is performed. Receive the signal.

The present invention minimizes interference signals during relaying of signals transmitted and received between a transmitter and a receiver in a communication system, and particularly, by minimizing interference caused by signals transmitted to the receiver when the signals received from the transmitter are relayed to the receiver. In addition, by optimizing the signal relay between the transmitter and the receiver, the transmitter and the receiver can normally transmit and receive signals.

1 to 4 schematically illustrate the structure of a relay device in a communication system according to embodiments of the present invention.
5 is a view schematically illustrating an operation process of a relay device in a communication system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the present invention will be described, and the description of other parts will be omitted so as not to disturb the gist of the present invention.

The present invention proposes a communication system, an apparatus and a method for relaying a signal between a transmitter and a receiver in a wireless communication system. Here, although an embodiment of the present invention will be described using a wireless system as an example, the signal relay scheme proposed by the present invention may be applied to other communication systems.

In addition, according to an embodiment of the present invention, when the link capacity is limited due to channel environment and distance limitation between the transmitter and the receiver in a communication system, a relay device, that is, a repeater, which relays a signal transmitted by the transmitter to the receiver, may be used. It extends the communication distance or improves the reception performance in the receiver. In particular, the repeater may relay the signal received from the transmitter to the receiver through amplification and forward (AF) method. In this case, the signal is relayed by minimizing the interference of the signal generated in the repeater, in particular, the interference by the repeater itself, that is, self-interference. In other words, the repeater according to an embodiment of the present invention amplifies an input signal received from the transmitter through a reception antenna and then transmits the signal to the receiver through a transmission antenna, wherein the transmission is transmitted to the receiver through the transmission antenna. The signal minimizes the effect of the interference signal on the input signal received through the receiving antenna, thereby improving the transmission efficiency of the signal transmitted by the transmitter to the receiver, thereby normalizing the signal between the transmitter and the receiver Send and receive.

Here, in the embodiment of the present invention, when the repeater relays the signal by the AF method, the signal is transmitted and received during different time intervals to minimize magnetic interference, that is, the signal received from the transmitter and the signal transmitted to the receiver. Using a half-duplex scheme for performing different time intervals, or a full-duplex scheme for simultaneously transmitting and receiving signals to increase channel capacity. Relay the signal. In the following embodiments of the present invention, for the convenience of description, a case in which a repeater relays a signal using a full-duplex method will be described. However, the embodiment of the present invention may be equally applied to a half-duplex method. . In addition, the repeater according to an embodiment of the present invention, a single input single output (SISO: SISO) method or multiple input multiple output (MIMO: Multiple Input Multiple Output, hereinafter 'MIMO' Receive a signal from the transmitter and transmit the signal to the receiver. Then, the relay device, that is, the repeater in the communication system according to an embodiment of the present invention will be described in more detail with reference to FIG. 1.

1 is a diagram schematically illustrating a structure of a relay device in a communication system according to an embodiment of the present invention.

Referring to FIG. 1, the relay device includes a reception antenna 110 for receiving a signal transmitted from a transmitter to a receiver, an RF front end unit 120 for RF processing a signal received through the reception antenna 110, and A power amplification unit 140 for amplifying the power of the received signal to a predetermined level, a transmission antenna 150 for transmitting the power amplified signal to the receiver, and a signal transmitted through the transmission antenna 150. It includes an interference cancellation unit 130 to minimize magnetic interference. Here, the RF front end 120 is a low noise amplifier (LNA: Low Noise Amplifier, referred to as "LNA"), intermediate frequency (IF: Intermediate Frequency, referred to as "IF"), and Analog-to-digital converter (ADC: Analog to Digital Converter, hereinafter referred to as 'ADC').

In addition, the relay device amplifies the received signal to a predetermined level through the power amplifier 140 to relay the signal received from the transmitter to the receiver through the AF method, and the amplified signal When transmitting to the receiver through the transmit antenna 150, the amplified signal transmitted through the transmit antenna 150 acts as an interference signal to the received signal input through the receive antenna 110 Accordingly, in order to remove the interference signal, the interference cancellation unit 130 minimizes interference in the time domain, that is, removes the interference signal.

Here, the interference canceling unit 130, as much as possible to reduce the interference by the signal transmitted through the transmission antenna 150, so that the relay device relays the signal in a full-duplex manner, in particular the receiving end of the relay device To maximize the isolation between the transmitting antenna and the transmitting antenna, that is, the receiving antenna 110 and the transmitting antenna 150, and also by eliminating interference in a time domain called an echo canceler, thereby minimizing magnetic interference in the relay device. Therefore, the signal is normally transmitted and received between the transmitter and the receiver. Then, the relay device, that is, the repeater in the communication system according to another embodiment of the present invention will be described in more detail with reference to FIG. 2.

2 is a diagram schematically illustrating a structure of a relay device in a communication system according to another embodiment of the present invention.

Referring to FIG. 2, the relay device includes a reception antenna 210 for receiving a signal transmitted from a transmitter to a receiver, an RF front end 220 for RF processing a signal received through the reception antenna 210, and the A plurality of power amplifiers for amplifying the power of the received signal to a predetermined level, for example, power amplifier 1 240 and power amplifier 2 245, a plurality of transmissions for transmitting the power amplified signals to the receiver Antennas, eg, transmit antenna 1 250 and transmit antenna 2 255, and an interference canceller 230 that minimizes magnetic interference due to signals transmitted through the transmit antennas 250 and 255. Here, the RF front end 220, LNA, IF stage, and ADC.

In addition, the relay device amplifies the received signal to a predetermined level through the power amplifiers 240 and 245, respectively, to relay the signal received from the transmitter to the receiver through an AF method. Is transmitted to the receiver through the transmit antennas 250 and 255, the amplified signals transmitted through the transmit antennas 250 and 255 are interference signals to the received signal input through the receive antenna 210. In order to remove the interference signal, the interference cancellation unit 230 minimizes interference in the spatial domain, that is, removes the interference signal.

In addition, the relay device, in the transmitting antennas (250, 255), the main transmission antenna for relaying the received signal to the receiver, for example, the transmission antenna 1 (250) and the transmission antenna 1 (250) which is the main transmission antenna In order to minimize the interference caused by the signal transmitted in the transmission antenna 1 (250) includes an auxiliary transmission antenna, for example transmit antenna 2 (255) to cancel the interference caused by the signal transmitted from. That is, the power amplifying unit 1 240 and the transmitting antenna 1 250 relay the signal received from the transmitter to the receiver by the AF method, and at this time, the power amplifying unit 2 245 and the transmitting antenna 2 (255). ), A signal canceling a signal transmitted from the transmission antenna 1 250 to minimize the interference of the signal transmitted from the transmission antenna 1 250 to a signal received through the reception antenna 210. Send.

In this case, the interference canceling unit 230 maximizes the interference by the signal transmitted through the transmission antenna 1 250 through the interference cancellation in the spatial domain so that the relay device relays the signal in a full-duplex manner. To this end, it forms a beam at transmit antenna 2 255 to cancel the interference caused by the beam formed at transmit antenna 1 250. That is, the interference canceling unit 230 removes the magnetic interference due to the signal transmitted from the main transmission antenna through the auxiliary transmission antenna according to the interference cancellation in the spatial domain, and at this time, the main transmission antenna and the auxiliary transmission. By determining a beam weight for a beam formed at the antenna, magnetic interference by the beam of the primary transmit antenna is eliminated by the beam of the auxiliary transmit antenna.

In addition, the interference cancellation unit 230 acquires interference channel information between the transmission antennas 250 and 255 and the reception antenna 210, and then uses beams of the transmission antennas 250 and 255 using the interference channel information. The beam weights at the time of formation are determined, respectively, and the power amplifiers 240 and 245 may form beams at the transmission antennas 250 and 255 corresponding to the beam weights determined by the interference cancellation unit 230 to remove magnetic interference. Each of the received signals is amplified to a predetermined level in consideration of the beam weight. Next, a relay device, that is, a repeater in a communication system according to another exemplary embodiment of the present invention will be described in more detail with reference to FIG. 3.

3 is a diagram schematically illustrating a structure of a relay device in a communication system according to another embodiment of the present invention. 3 is a diagram schematically illustrating a structure when the relay device receives a signal from the transmitter and transmits a signal to the receiver through a SISO scheme.

Referring to FIG. 3, the relay device includes a reception antenna 305 for receiving a signal transmitted from a transmitter to a receiver, an RF front end 310 for RF processing a signal received through the reception antenna 305, and A plurality of power amplifiers for amplifying the power of the received signal to a predetermined level, for example, the auxiliary power amplifier 345 and the main power amplifier 350, a plurality of transmissions for transmitting the power amplified signals to the receiver Antennas, e.g., transmit antenna 1 355 and transmit antenna 2 360, and spatial domain interference nulling (SDIN) schemes for removing magnetic interference. The power measuring unit 315, a plurality of processing units such as the auxiliary processing unit 320, a main processing unit 340, a switching unit 325, a plurality of weighting units such as the auxiliary weighting unit 330, and the main weighting unit 335 It includes. Here, the RF front end 310 includes an LNA, an IF stage, and an ADC.

In addition, the relay device amplifies the received signal to a predetermined level through the power amplifiers 345 and 350 to relay the signal received from the transmitter to the receiver through an AF method, and thus the amplified signal. Is transmitted to the receiver through the transmission antennas 355 and 360, the amplified signals transmitted through the transmission antennas 355 and 360 interfere with the received signal input through the reception antenna 305. In order to remove such interference signal, the SDIN method minimizes interference in the spatial domain, that is, removes the interference signal.

In addition, the relay device, in the transmission antennas (355, 360), the main transmission antenna, for example, the transmission antenna 1 (360) for relaying the received signal to the receiver, and the transmission antenna 1 (360) which is the main transmission antenna In order to minimize the interference caused by the signal transmitted in the transmission antenna 1 360 includes an auxiliary transmission antenna, for example, transmit antenna 2 (355) to cancel the interference caused by the signal transmitted from. That is, the main power amplifying unit 350 and the transmitting antenna 1 360 relay the signal received from the transmitter to the receiver by the AF method, and at this time, the auxiliary power amplifying unit 345 and the transmitting antenna 2 355. ), A signal canceling a signal transmitted from the transmission antenna 1 360 to minimize interference of a signal transmitted from the transmission antenna 1 360 to a signal received through the reception antenna 305. Send.

In this case, the relay device minimizes the interference by the signal transmitted through the transmission antenna 1 360 through the interference cancellation in the spatial domain by the SDIN method so as to relay the signal in the full-duplex method. To this end, a beam is formed at the transmit antenna 2 355 to cancel interference caused by the beam formed at the transmit antenna 1 360. That is, the relay device removes the magnetic interference due to the signal transmitted from the main transmission antenna through the auxiliary transmission antenna according to the interference cancellation in the spatial domain through the SDIN method, wherein the main transmission athena and the auxiliary transmission. By determining a beam weight for a beam formed at the antenna, magnetic interference by the beam of the primary transmit antenna is eliminated by the beam of the auxiliary transmit antenna.

In addition, the relay device, after measuring the power level of the signal received from the receiving antenna 305, that is, the input signal, is formed in the beam weight, in particular in the auxiliary transmission antenna in consideration of the power level of the measured input signal The auxiliary power amplifying unit 345 calculates a weight of the beam, that is, an auxiliary beam weight, and forms a beam at the transmission antenna 2 355 corresponding to the auxiliary beam weight to remove magnetic interference. Amplifies the input signal to a predetermined level.

In other words, the power measurement unit 315 measures the power level of the input signal received through the reception antenna 305, and the auxiliary processor 320 considers the measured power level of the input signal. Calculate the secondary beam weights. Here, the auxiliary processor 320 calculates and determines an auxiliary beam weight for the beam formed by the transmission antenna 2 355, which is the auxiliary transmission antenna, and for calculating the auxiliary beam weight of the auxiliary processor 320 as follows. As will be described in more detail in the following detailed description thereof will be omitted.

The main processor 340 transmits the input signal received through the reception antenna 305 to the receiver through the transmission antenna 1 360, which is the main transmission antenna, to the receiver. The primary beam weight for the beam formed at 1 360 is calculated. Here, the calculation of the main beam weight of the main processor 340 will be described in more detail below, and thus a detailed description thereof will be omitted.

In addition, the main weighting unit 335 receives an input signal RF processed by the RF front end 310 by switching the switching unit 325, and receives the main beam weight from the main processing unit 340. Receive. The main weighting unit 335 applies the main beam weight to the input signal, and transmits the input signal to which the main beam weight is applied to the main power amplifier 350. Here, the main weighting unit 335 multiplies the input signal by the main beam weight to apply the main beam weight to the input signal.

In addition, the auxiliary weighting unit 330 receives an input signal RF processed by the RF front end 310 by switching of the switching unit 325, and receives the auxiliary beam weight from the auxiliary processing unit 320. Receive. The auxiliary weighting unit 330 applies the auxiliary beam weight to the input signal and transmits the input signal to which the auxiliary beam weight is applied to the auxiliary power amplifier 345. Here, the auxiliary weighting unit 330 multiplies the input signal by the auxiliary beam weight to apply the auxiliary beam weight to the input signal.

The auxiliary power amplifier 345 amplifies the input signal to which the auxiliary beam weight is applied to a predetermined level, and the amplified input signal is transmitted through the transmission antenna 2 355 which is the auxiliary transmission antenna. The main power amplifier 350 amplifies the input signal to which the main beam weight is applied to a predetermined level, and the amplified input signal is transmitted through the transmit antenna 1 360 which is the main transmit antenna.

Here, the signal transmitted through the transmission antenna 1 (360) is relayed to the receiver, and at this time, magnetic interference by the signal transmitted from the transmission antenna (1 360), that is, the signal transmission from the transmission antenna 1 (360) Interference to the reception antenna 305 by the beam formed at the time is removed by the beam formed in the transmission antenna 2 (355). That is, as the transmission antenna 2 360 transmits the signal amplified by applying the auxiliary beam weight, the magnetic interference caused by the signal transmitted to the receiver through the transmission antenna 1 360 is removed, that is, the SDIN method. Through this, the interference signal from the reception antenna 305 by the transmission antennas 355 and 360 is minimized, and thus the signal is normally transmitted and received between the transmitter and the receiver. Here, with reference to Figure 4 will be described in more detail with respect to a relay device, that is, a repeater in a communication system according to another embodiment of the present invention.

4 is a diagram schematically illustrating a structure of a relay device in a communication system according to another embodiment of the present invention. 4 is a diagram schematically illustrating a structure when the relay device receives a signal from the transmitter through a MIMO scheme and transmits a signal to the receiver.

Referring to FIG. 4, the relay device includes a plurality of RF antennas for receiving a signal transmitted from a transmitter to a receiver and RF signals for signals received through the reception antennas 405 and 410, respectively. Front ends 435 and 440, a plurality of power amplifiers for amplifying the power of the received signals to a predetermined level, for example, a plurality of auxiliary power amplifiers 475 and 480 and a plurality of main power amplifiers 485 and 490, the power amplification. A plurality of transmit antennas for transmitting the decoded signals to the receiver, such as a plurality of auxiliary transmit antennas 492 and 494 and a plurality of primary transmit antennas 496 and 498, and a plurality of power measurements to remove magnetic interference via the SDIN scheme And a plurality of processing units 415 and 420, for example, an auxiliary processing unit 430, a main processing unit 340, a switching unit 465, and a plurality of weighting units such as an auxiliary weighting unit 460 and a main weighting unit 470. do. The RF front ends 435 and 440 may include an LNA, an IF terminal, and an ADC.

In addition, the relay device amplifies the received signal to a predetermined level through the power amplifiers 475, 480, 485 and 490, respectively, in order to relay the signal received from the transmitter to the receiver through the AF method. Are transmitted to the receiver via the transmit antennas 492, 494, 496, 498, the amplified signals transmitted through the transmit antennas 492, 494, 496, 498 are applied to the received signals input through the receive antennas 405, 410. As an interference signal, the SDIN method minimizes interference in the spatial domain, that is, removes the interference signal to remove such interference signal.

In addition, the relay device may be configured to transmit signals from the transmission antennas 492, 494, 496 and 498 to the transmission antennas 496 and 498, which relay the received signals to the receiver, and to the transmission signals from the transmission antennas 496 and 498. Auxiliary transmit antennas 492, 494 cancel out interference by signals transmitted at the transmit antennas 496, 498 to minimize the interference caused. That is, the main power amplifiers 485 and 490 and the main transmit antennas 496 and 498 relay signals received from the transmitter to the receiver in an AF manner, and the auxiliary power amplifiers 475 and 480 and the auxiliary transmit antennas. 492.494 is transmitted at the primary transmit antennas 496, 498 to minimize the interference of signals transmitted at the primary transmit antennas 496, 498 to signals received via the receive antennas 405, 410. Send signals that cancel the signals.

Here, the relay device reduces the interference by the signals transmitted through the main transmission antennas 496 and 498 as much as possible by eliminating interference in the spatial domain by the SDIN scheme so as to relay the signal in a full-duplex manner. To this end, it forms a beam in the auxiliary transmission antennas 492, 494 to cancel the interference by the beam formed in the primary transmission antennas (496, 498). That is, the relay device removes the magnetic interference by the signals transmitted from the primary transmission antennas through the auxiliary transmission antennas according to the interference cancellation in the spatial domain through the SDIN scheme, wherein the relay device and the primary transmission antennas By determining a beam weight for a beam formed in the auxiliary transmit antennas, magnetic interference by the beam of the primary transmit antennas is eliminated by the beam of the auxiliary transmit antennas.

In addition, the relay apparatus, after measuring the power level of the signals received from the receiving antennas (405, 410), that is, the input signals, respectively, and considering the power level of the measured input signals, the beam weight, in particular the auxiliary transmission The auxiliary power amplification is calculated to calculate the weight of the beams formed at the antennas 492 and 494, that is, the auxiliary beam weights, and to form a beam at the auxiliary transmit antennas 492 and 494 corresponding to the auxiliary beam weights to eliminate magnetic interference. Parts 475 and 480 amplify the input signal to a predetermined level.

In other words, the power measuring units 415 and 420 measure the power levels of the input signals received through the receiving antennas 405 and 410, respectively, and the auxiliary processor 430 measures the power levels of the measured input signals. The auxiliary beam weight is calculated in consideration. Here, the auxiliary processor 430 calculates and determines the auxiliary beam weights for the beams formed by the auxiliary transmit antennas 492 and 494, and the auxiliary beam weight of the auxiliary processor 430 is more specifically described below. As will be described herein, detailed description thereof will be omitted.

In addition, the main processor 465 may transmit the input signals received through the reception antennas 405 and 410 to the receiver through the main transmission antennas 496 and 498. The main beam weight for the beam to be formed is calculated. Here, the calculation of the main beam weight of the main processor 465 will be described in more detail below, and thus a detailed description thereof will be omitted.

In addition, the main weighting unit 470 receives input signals RF processed by the RF front end units 435 and 440 by switching of the switching unit 445 including a plurality of switches, and the main processing unit 465. Receive the main beam weight from The main weighting unit 470 applies the main beam weight to the input signals and transmits the input signal to which the main beam weight is applied to the main power amplifiers 485 and 490. Here, the main weighting unit 470 multiplies the input signals by the main beam weight to apply the main beam weight to the input signals.

In addition, the auxiliary weighting unit 460 receives an RF signal processed by the RF front end units 435 and 440 by switching of the switching unit 445 including a plurality of switches, and the auxiliary processing unit 430. The auxiliary beam weight is received from. The auxiliary weighting unit 460 applies the auxiliary beam weight to the input signals and transmits the input signals to which the auxiliary beam weight is applied to the auxiliary power amplifiers 475 and 480. Here, the auxiliary weighting unit 460 applies the auxiliary beam weight to the input signal by multiplying the input signals by the auxiliary beam weight.

The auxiliary power amplifiers 475 and 480 amplify the input signals to which the auxiliary beam weights are applied to a predetermined level, and the amplified input signals are transmitted through the auxiliary transmission antennas 492 and 494. The main power amplifiers 485 and 490 amplify the input signals to which the main beam weight is applied to a predetermined level, and the amplified input signals are transmitted through the main transmission antennas 496 and 498.

Here, the signals transmitted through the main transmission antennas 496 and 498 are relayed to the receiver, whereby magnetic interference by the signals transmitted from the main transmission antennas 496 and 498, that is, the main transmission antennas 496 and 498 Interference to the receive antennas 405 and 410 by the beam formed at the signal transmission at s is removed by the beam formed by the auxiliary transmit antennas 492 and 494. That is, as the auxiliary beam antennas 492 and 494 transmit signals amplified by applying the auxiliary beam weights, magnetic interference caused by a signal transmitted to the receiver through the main transmission antennas 496 and 498 is eliminated, that is, Through the SDIN scheme, interference signals from the reception antennas 405 and 410 by the transmission antennas 492, 494, 496, and 498 are minimized, and thus the transmitter and the receiver normally transmit and receive signals.

In addition, unlike the repeater for relaying signals in the SISO method shown in FIG. 3, the repeater for relaying signals in the MIMO method includes a plurality of reception antennas 405 and 410, and a plurality of main transmission antennas 496 and 498. And a plurality of power measuring units 415 and 420 and a plurality of RF front ends 435 and 440, including the auxiliary transmission antennas 492 and 494, and input signals are received through the plurality of receiving antennas 405 and 410. Main power measuring units 485 and 490 and a plurality of auxiliary power measuring units 475 and 480, wherein the main beam weight and the auxiliary beam weight are calculated in the form of a complex matrix. Next, the process of calculating the main beam weight and the auxiliary beam weight in the relay apparatus according to the embodiment of the present invention in order to minimize magnetic interference through the SDIN method will be described in more detail.

The relay device measures the power level of the input signal received from the transmitter via the receive antenna as described above. That is, the relay device minimizes magnetic interference through the SDIN method corresponding to power information including only the magnitude of the power of the input signal to allow the transmitter and the receiver to transmit and receive a signal normally.

In more detail, the relay apparatus includes a channel coefficient between a receiving antenna receiving an input signal from a transmitter and a transmitting antenna transmitting the input signal to a receiver, particularly a channel generating magnetic interference between the receiving antenna and the transmitting antenna. Without considering channel coefficients (hereinafter referred to as 'echo channel coefficients'), beam weights are calculated through the power magnitude of the input signal, and magnetic interference is eliminated through the SDIN method using beam weights. Here, at any time A, the power of the interference signal to the receiving antenna by the transmitting antenna can be expressed by Equation 1.

Figure pat00001

In Equation 1,

Figure pat00002
Denotes a secondary beam weight at time A,
Figure pat00003
Means the main beam weight,
Figure pat00004
Is the echo channel coefficient from the auxiliary transmit antenna to the receive antenna at time A,
Figure pat00005
Is the echo channel coefficient from the primary transmit antenna to the receive antenna,
Figure pat00006
Denotes the power magnitude of the interference signal at time A. Here, the auxiliary beam weights, the main beam weights, and the echo channel coefficients are complex values. Hereinafter, for convenience of description, it is assumed that the amplification degrees of the auxiliary power amplifier and the main power amplifier are 1. That is, when the unit power transmission signal is transmitted at the A time point in the transmission antennas of the relay device, the power magnitude of the interference signal in the reception antenna by the transmission antennas may be expressed by Equation 1.

Here, as the relay device removes the interference signal from the receiving antenna by the transmitting antennas through the SDIN method, the power level of the interference signal represented by Equation 1 is minimized in the SDIN method. Since the power magnitude of the signal is a convex function for the auxiliary beam weights, the power magnitude of the interference signal in Equation 1, that is,

Figure pat00007
Secondary beam weights that minimize
Figure pat00008
Calculate Further, in Equation 1, e (
Figure pat00009
) Is the main interference signal (
Figure pat00010
) Is a secondary interference signal by the auxiliary transmit antenna (
Figure pat00011
), I.e., the interference beam caused by the beam formed by the primary transmission antenna is canceled by the interference beam caused by the beam formed by the auxiliary transmission antenna, and then the residual interference signal e (
Figure pat00012
Auxiliary beam weight, i.e.
Figure pat00013
To minimize
Figure pat00014
Calculate

In this case, the echo channel coefficients

Figure pat00015
And
Figure pat00016
When correctly obtaining, the auxiliary beam weight may be expressed as Equation 2 below.

Figure pat00017

However, in the embodiment of the present invention, as described above, the auxiliary beam weight is calculated by measuring the power level of the input signal rather than the channel coefficient, so that the relay device according to the embodiment of the present invention is Echo Channel Coefficients

Figure pat00018
And
Figure pat00019
Auxiliary beam using
Figure pat00020
Does not yield Here, the relay device, the echo channel coefficient from the auxiliary transmitting antenna to the receiving antenna
Figure pat00021
And the residual interference signal e (
Figure pat00022
), The magnitude of the power of the interfering signal
Figure pat00023
of
Figure pat00024
Gradient for
Figure pat00025
), And thus, the auxiliary beam weight for any auxiliary transmit antenna can be expressed by Equation 3 below.

Figure pat00026

In Equation (3)

Figure pat00027
Denotes a secondary beam weight for the secondary transmit antenna in any k th step,
Figure pat00028
Denotes an auxiliary beam weight for an auxiliary transmit antenna in a k + 1 th step, and μ is a positive real number.
Figure pat00029
It means the size of the step when calculating recursively. Here, the relay device, as described above, the echo channel coefficient from the auxiliary transmitting antenna to the receiving antenna
Figure pat00030
Cannot be obtained, and the residual interference signal e (
Figure pat00031
), But by measuring the power magnitude of the input signal received through the receiving antenna, the magnitude of the interference signal
Figure pat00032
of
Figure pat00033
Gradient for
Figure pat00034
To estimate the optimal secondary beam weight
Figure pat00035
Calculate

Thus the optimal auxiliary beam weight

Figure pat00036
In order to calculate, first, the relay device, in acquisition mode, the initial value secondary beam weight
Figure pat00037
(
Figure pat00038
= 0), the magnitude of power of the interference signal by Equation 1
Figure pat00039
end
Figure pat00040
To minimize the RF front end from saturation
Figure pat00041
Becoming
Figure pat00042
To track.

Then, the relay device, in tracking mode, the RF front end portion of the minimum

Figure pat00043
After deviating from the saturation state, in the state of normally receiving the input signal from the transmitter through the receiving antenna, the magnitude of the power of the interference signal
Figure pat00044
The secondary beam weights to minimize To update the optimal secondary beam weights
Figure pat00046
Calculate

More specifically, in the acquisition mode, the auxiliary beam weights for calculating by the relay device

Figure pat00047
Is a plural value, where the real part u and the imaginary part v are
Figure pat00048
It can be represented by the secondary beam weights
Figure pat00049
Mistake vector
Figure pat00050
In this case, the auxiliary beam weight of Equation 3 may be represented by a real vector as shown in Equation 4.

Figure pat00051

Then, the auxiliary beam weight at the kth step by recursion

Figure pat00052
end
Figure pat00053
If it has a value of,
Figure pat00054
If, the power magnitude of the interference signal
Figure pat00055
of
Figure pat00056
Gradient for
Figure pat00057
May be represented as Equation 5 as a real vector.

Figure pat00058

In Equation 5, each component may be represented as in Equation 6.

Figure pat00059

Δ> 0 in Equation 6, and the power magnitude of the interference signal through Equation 5

Figure pat00060
of
Figure pat00061
Gradient for
Figure pat00062
In order to calculate the auxiliary processing unit,
Figure pat00063
,
Figure pat00064
, And
Figure pat00065
Equivalent to
Figure pat00066
The values are respectively transmitted to the auxiliary weight section so as to be multiplied by the input signal. Then, after transmitting a signal having a unit power through the transmitting antenna at the time A, the power measuring unit
Figure pat00067
,
Figure pat00068
, And
Figure pat00069
When an interfering signal corresponding to is received through the receiving antenna, the power magnitude of the input signal, that is, the power magnitude of the interference signal
Figure pat00070
,
Figure pat00071
, And
Figure pat00072
Measure each.

The power magnitude of the measured input signal, that is, the magnitude of the interference signal

Figure pat00073
,
Figure pat00074
, And
Figure pat00075
After calculating the values of each component shown in Equation 6, the gradient
Figure pat00076
Mistake vector
Figure pat00077
Yields a real vector gradient
Figure pat00078
Can be expressed as in Equation (7).

Figure pat00079

The optimal auxiliary beam weights through a recursion process in which Equation 7 is applied to Equation 4

Figure pat00080
Calculate Here, when the size μ of the step in the recursive process is fixed to a large value, the recursive process may diverge, or when the size μ of the step is fixed to a small value, the convergence speed of the recursive process may decrease. . Therefore, the optimum auxiliary beam weight is adjusted by adjusting the size μ of the step.
Figure pat00081
Since it takes a considerable time to calculate the, the relay device according to an embodiment of the present invention, real vector gradient through the equation (7)
Figure pat00082
Is calculated
Figure pat00083
Determine the direction step size.

In other words, the real vector gradient via Equation 7

Figure pat00084
Is calculated,
Figure pat00085
The next recursion process is performed with a predetermined step size in the direction. after that,
Figure pat00086
In the direction of the next recursion process,
Figure pat00087
If decreases, increase the size of the step
Figure pat00088
The next recursion process in the
Figure pat00089
Is reduced.

That is, the magnitude of the power of the interference signal in Equation 1 as described above

Figure pat00090
Quot;
Figure pat00091
Is a convex function for and the magnitude of the power of the interfering signal
Figure pat00092
In order to minimize the
Figure pat00093
Becomes a cost function. Ie cost function
Figure pat00094
Currently
Figure pat00095
There are locally reduced, increased, and bowl forms, with one form in these three forms. Here, the reduced type is present
Figure pat00096
based on this
Figure pat00097
In the direction
Figure pat00098
,
Figure pat00099
When the recursion process is performed in turn, the cost function gradually decreases, and the increase means the increase in the cost function, and the bowl means the decrease and increase.

here,

Figure pat00100
,
Figure pat00101
,
Figure pat00102
of
Figure pat00103
In the case of a test auxiliary beam weight set (hereinafter, referred to as a 'test set') for calculating a,
Figure pat00104
After calculating the
Figure pat00105
New test set if reduced by
Figure pat00106
,
Figure pat00107
,
Figure pat00108
When set,
Figure pat00109
Wow
Figure pat00110
New
Figure pat00111
and
Figure pat00112
Change to, and new
Figure pat00113
Is the previous
Figure pat00114
Wow
Figure pat00115
Is set to advance twice as wide as the interval between
Figure pat00116
To accelerate the deceleration.

In addition, the calculated

Figure pat00117
New test set when incremented through
Figure pat00118
,
Figure pat00119
,
Figure pat00120
When set,
Figure pat00121
and
Figure pat00122
New
Figure pat00123
Wow
Figure pat00124
Change to new
Figure pat00125
Is the previous
Figure pat00126
and
Figure pat00127
Set back by twice as wide as the interval between
Figure pat00128
To accelerate the deceleration.

In addition, the calculated

Figure pat00129
If it is confirmed to be a step type through, instead of expanding the current step, it converges to the minimum point. That is, the calculated
Figure pat00130
Current test set, if identified as a bowl ,
Figure pat00132
,
Figure pat00133
Add two test points between
Figure pat00134
and
Figure pat00135
Between
Figure pat00136
Add,
Figure pat00137
Wow
Figure pat00138
Between
Figure pat00139
Add additional settings. Then test set
Figure pat00140
,
Figure pat00141
,
Figure pat00142
,
Figure pat00143
,
Figure pat00144
Between
Figure pat00145
If is determined to be the minimum, then
Figure pat00146
,
Figure pat00147
,
Figure pat00148
New test set test set
Figure pat00149
,
Figure pat00150
,
Figure pat00151
Change to
Figure pat00152
If is determined to be the minimum, then
Figure pat00153
,
Figure pat00154
,
Figure pat00155
New test set
Figure pat00156
,
Figure pat00157
,
Figure pat00158
Change to And,
Figure pat00159
If is determined to be the minimum, then
Figure pat00160
,
Figure pat00161
,
Figure pat00162
New test set
Figure pat00163
,
Figure pat00164
,
Figure pat00165
Change to Therefore, based on the minimum of the actual cost function
Figure pat00166
For
Figure pat00167
By computing, convergence exponentially at the minimum point.

This exponential convergence gives the best fit to the approximate slope at the kth step.

Figure pat00168
Is determined to be calculated and the
Figure pat00169
An approximate slope at the next k + 1 th step is calculated by Equation 7 below. In other words,
Figure pat00170
Is a cost function
Figure pat00171
Is the minimum at.

For example, in the acquisition mode,

Figure pat00172
,
Figure pat00173
,
Figure pat00174
Noise dispersion at the input of the relay, i.e., the receiving antenna
Figure pat00175
, A 100dB cost function with 4 approximate slope updates, and 50 test set updates.
Figure pat00176
The value is reduced.

Where faster cost function

Figure pat00177
Exponentially to obtain a reduction of
Figure pat00178
If you update the size of,
Figure pat00179
In polar form,
Figure pat00180
Compute a gradient for, wherein
Figure pat00181
end
Figure pat00182
Cannot be represented as a convex function for
Figure pat00183
Although it is difficult to calculate, in the embodiment of the present invention, in the search mode, the current step in the random search direction is different from the optimum step size.
Figure pat00184
Gradient in
Figure pat00185
Yields the current
Figure pat00186
Gradient in
Figure pat00187
Can be expressed as in Equation 8.

Figure pat00188

In Equation (8)

Figure pat00189
And
Figure pat00190
Denotes a variable having a probability of 1/2 randomly one of '1' and '-1'. Here, by the equation (4)
Figure pat00191
When is set
Figure pat00192
If
Figure pat00193
Respectively,
Figure pat00194
If not,
Figure pat00195
. At this time, a decrease in the cost function occurs every k-th step, or by maintaining the minimum cost function, the cost function can converge on the minimum and track the channel variable.

In the above, the operation of calculating the weights, in particular the auxiliary beam weight in the repeater relaying a signal through the SISO method, that is, the relay device as shown in FIG. 3 has been described in detail. Scalar values for calculating the auxiliary beam weights as described above

Figure pat00196
In the MIMO relay apparatus, scalar values used by the above-described SISO relay apparatus for calculating auxiliary beam weights are used.
Figure pat00197
Matrix values corresponding to a plurality of receive antennas
Figure pat00198
. That is, in the MIMO method, scalar values in the auxiliary beam weight calculation in the above-described SISO method.
Figure pat00199
Matrix values
Figure pat00200
Calculate by changing to. Then, the signal relay operation of the relay device in the communication system according to an embodiment of the present invention will be described in more detail with reference to FIG. 5.

5 is a diagram schematically illustrating an operation process of a relay device in a communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in step 510, the relay device measures a power level of an input signal received through a receive antenna from a transmitter. In step 520, the relay apparatus calculates a weight, in particular an auxiliary beam weight, using the measured power level of the input signal. The auxiliary beam weight calculation has been described in detail above, and thus detailed description thereof will be omitted.

Next, in step 530, the relay device multiplies and applies the calculated weight to an input signal. In this case, the relay device multiplies and applies an auxiliary beam weight and a main beam weight to the input signal.

In operation 540, the relay device amplifies the weighted input signal to a predetermined level and transmits the amplified input signal to the receiver through the transmission antennas. Here, to minimize the magnetic interference caused by the amplified input signal transmitted to the receiver, the magnetic antenna to remove the magnetic interference through the auxiliary transmission antenna in the transmission antenna, wherein the magnetic interference through the beam formed in the auxiliary antenna Cancels the beam of the interfering signal. Therefore, the relay device minimizes the magnetic interference caused by the amplified input signal transmitted to the receiver to relay the input signal received from the transmitter to the receiver, thereby allowing the signal to be normally transmitted and received between the transmitter and the receiver.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

Claims (26)

In the repeater for relaying signals in a communication system,
Signal relay, characterized in that the power measuring device before the RF front end of the repeater to measure the power of the input signal including the self-interference signal (Echo), and to remove the spatial domain interference in accordance with the power of the measured input signal Device.
An apparatus for relaying signals in a communication system,
A receiving antenna for receiving an input signal received from a transmitter;
A power amplifier for amplifying the input signal to a predetermined power level; And
Transmit antennas for transmitting the amplified input signal to a receiver;
In the receiving antenna, self-interference generated by the amplified input signal transmitted through the transmitting antennas is removed by a spatial-domain interference nulling (SDIN) method, thereby receiving the input signal. Signal relay device, characterized in that for receiving.
The method of claim 2,
A power measuring unit measuring a power level of the received input signal;
An auxiliary processor configured to calculate an auxiliary beam weight using the measured power level; And
And an auxiliary weighting unit multiplying the input signal by the auxiliary beam weight.
The method of claim 3,
A main processor for calculating a main beam weight for the input signal; And
And a main weighting unit multiplying the input signal by the main beam weight. The signal relay apparatus further comprising an input signal.
The power amplifier of claim 4, wherein the power amplifying unit comprises:
An auxiliary power amplifier configured to amplify the input signal multiplied by the auxiliary beam weights; And
And a main power amplifier configured to amplify the input signal multiplied by the main beam weights.
The method of claim 5, wherein the transmitting antennas,
An auxiliary transmission antenna for transmitting an amplified input signal by multiplying the auxiliary beam weights; And
And a main transmission antenna for transmitting the amplified input signal by multiplying the main beam weights.
The method according to claim 6,
When the signal transmitted from the primary transmission antenna becomes an interference signal to the input signal received through the reception antenna, the interference signal transmitted from the primary transmission antenna is transmitted through the beam of the signal transmitted from the auxiliary transmission antenna. Signal relay device, characterized in that the beam is canceled.
The method of claim 7, wherein
The power measuring unit measures a power level of the interference signal input through the receiving antenna;
And the auxiliary processor calculates the auxiliary beam weight for minimizing the power level of the interference signal.
The method of claim 7, wherein
The power measuring unit measures a power level of a residual signal from which the beam of the interference signal is canceled;
And the auxiliary processing unit calculates an optimal auxiliary beam weight for minimizing the power level of the residual signal.
10. The method according to claim 8 or 9,
And the auxiliary processing unit calculates a gradient of the auxiliary beam weights of the power levels to calculate the auxiliary beam weights.
The method of claim 10,
And an RF front end unit for RF processing the input signal received through the reception antenna and outputting the RF signal to the auxiliary weighting unit and the main weighting unit.
The method of claim 11, wherein the auxiliary processing unit,
When the RF front end is saturated, calculate the auxiliary beam weights in acquisition mode;
And the auxiliary beam weights are calculated in a tracking mode when the RF front end portion is out of saturation.
The method of claim 12,
And the auxiliary processing unit calculates an optimal auxiliary beam weight that minimizes the cost function after defining the power levels as a cost function.
The method of claim 13,
The auxiliary processing unit, in the acquisition mode, checks the cost function according to the power level as being reduced, increased, and bowl type, and then the step size of the cost function according to the reduced, increased, and bowl type. And calculating the auxiliary beam weight by varying.
The method of claim 13,
The auxiliary processing unit, in the tracking mode, reduces the cost function in the search direction of the step size of the cost function and calculates the auxiliary beam weight at the minimum cost function.
In the repeater for relaying signals in a communication system,
Signal relay, characterized in that the power measuring device before the RF front end of the repeater to measure the power of the input signal including the self-interference signal (Echo), and to remove the spatial domain interference in accordance with the power of the measured input signal Device.
In a method for relaying a signal in a communication system,
Receiving an input signal from a transmitter via a receive antenna;
Amplifying the input signal to a predetermined power level; And
Transmitting the amplified input signal to a receiver through transmission antennas;
In the receiving step, self-interference generated by the amplified input signal transmitted through the transmitting antennas is removed by a spatial-domain interference nulling (SDIN) method, thereby receiving the input. A signal relay method for receiving a signal.
18. The method of claim 17,
Measuring a power level of the received input signal; And
And calculating beam weights for the received input signals.
The method of claim 18, wherein the calculating step,
Calculating an auxiliary beam weight using the measured power level; And
Calculating a main beam weight for the input signal.
20. An input signal according to claim 19
The amplifying step,
Multiplying the input signal by the auxiliary beam weight and then amplifying the input signal multiplied by the auxiliary beam weight; And
And multiplying the input signal by the main beam weight, and then amplifying the input signal multiplied by the main beam weight.
21. The method of claim 20,
The transmitting may include transmitting an input signal amplified by multiplying the auxiliary beam weights through the auxiliary transmission antennas by the transmission antennas and transmitting an input signal amplified by the main beam weights by the transmission antennas. A signal relay method comprising transmitting via a main transmission antenna.
The method of claim 21,
The transmitting may include: when the signal transmitted from the primary transmission antenna becomes an interference signal to the input signal received through the reception antenna, at the primary transmission antenna through a beam of a signal transmitted from the auxiliary transmission antenna. Canceling the beam of the transmitted interference signal.
The method of claim 22,
The measuring may include measuring a power level of the interference signal input through the receiving antenna;
The calculating may include calculating the auxiliary beam weights to minimize the power level of the interference signal.
24. The method of claim 23,
The measuring may include measuring a power level of a residual signal from which the beam of the interference signal is canceled;
The calculating may include calculating an optimal auxiliary beam weight for minimizing the power level of the residual signal.
The method of claim 23 or 24,
The calculating may include calculating the auxiliary beam weights by calculating a gradient of the auxiliary beam weights of the power levels.
26. The method of claim 25,
The calculating may include defining the power levels as a cost function and then calculating an optimal auxiliary beam weight that minimizes the cost function.
KR1020110130764A 2011-12-08 2011-12-08 Apparatus and method for relaying signal in communication system KR20130064240A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110130764A KR20130064240A (en) 2011-12-08 2011-12-08 Apparatus and method for relaying signal in communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110130764A KR20130064240A (en) 2011-12-08 2011-12-08 Apparatus and method for relaying signal in communication system

Publications (1)

Publication Number Publication Date
KR20130064240A true KR20130064240A (en) 2013-06-18

Family

ID=48861249

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110130764A KR20130064240A (en) 2011-12-08 2011-12-08 Apparatus and method for relaying signal in communication system

Country Status (1)

Country Link
KR (1) KR20130064240A (en)

Similar Documents

Publication Publication Date Title
KR101375042B1 (en) Inserted pilot construction for an echo cancellation repeater
JP4824821B2 (en) Interference cancellation radio relay apparatus and method
US9966983B2 (en) Interference cancellation in MIMO same channel full-duplex transceivers
KR20100131146A (en) Adaptive interference cancellation apparatus and method for ics repeater in wireless communication system
US9872294B2 (en) Base station, radio communications system, and processing method in base station
JP5431609B1 (en) Base station, interference suppression device, and interference suppression method
KR20130064240A (en) Apparatus and method for relaying signal in communication system
WO2008108528A1 (en) Wireless repeater apparatus for canceling interference signal
KR100941491B1 (en) System of echo cancellation and echo channel estimation using the multiple antennas
KR20110007481A (en) Apparatus and method for feedback interference cancellation in a wireless repeater
KR20130064860A (en) Apparatus and method for relaying signal in communication system
EP1748578B1 (en) Method and device for repeating isofrequency signals
WO2002054628A1 (en) Broadband wireless repeater using the beamforming technique for wireless telecommunication service
JP5386610B2 (en) Base station, interference suppression device, and interference suppression method
JP5431610B1 (en) Base station, interference suppression device, and interference suppression method
KR101276800B1 (en) method for detecting signal in MIMO wireless communication system and apparatus thereof
KR102417563B1 (en) Apparatus and method for wireless relaying
US20240113770A1 (en) Relay station, information processing apparatus, and method
JP5521201B2 (en) Roundabout canceller and roundabout cancellation method
KR20080058805A (en) Apparatus and method for supporting beamforming of repeater in broardband wireless communicaction system
JP5527604B2 (en) Rounding canceller and rounding cancellation method
RU170314U1 (en) FULL DUPLEX WIRELESS DEVICE
KR20130047189A (en) Method canceling interference using adaptive digital filter in on-frequency rf repeaters

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination