WO2016021764A1

WO2016021764A1 - Single-input single-output interference cancellation repeater

Info

Publication number: WO2016021764A1
Application number: PCT/KR2014/008668
Authority: WO
Inventors: 장인호; 김도윤
Original assignee: 주식회사 쏠리드
Priority date: 2014-08-04
Filing date: 2014-09-17
Publication date: 2016-02-11
Also published as: KR101766814B1; KR20160016302A

Abstract

A repeater according to an aspect of the present invention is a repeater which is coupled to an adjacent repeater and includes a first channel formed between a reception antenna and a transmission antenna which correspond thereto, the repeater comprising: an interference cancellation unit for cancelling, from a signal input to the first channel, a first interference signal by a signal radiated through the first channel and a second interference signal by a signal radiated from the coupled repeater, and then outputting a first interference-cancelled signal; and a signal sharing unit for transmitting the first interference-cancelled signal to the coupled repeater, and receiving, from the coupled repeater, an input of a second interference-cancelled signal obtained by cancelling the first and second interference signals from a signal input to a second channel which is formed between the reception antenna and the transmission antenna corresponding to the coupled repeater.

Description

Single Input Single Output Interference Cancellation Relay Device

The present invention relates to a single-input single-output (SISO) interference cancellation relay device, and more specifically, to a multiple-input multiple-output coupled to another SISO interference cancellation relay device. It relates to a SISO interference cancellation relay device that can be operated in a MIMO (MIMO) method.

In general, a relay device is used to transmit a signal between a base station and a terminal and to improve service or improve quality of a radio shadow area. The relay apparatus provides a communication service for receiving a signal transmitted from a base station or a terminal through a reception antenna, amplifying the signal and transmitting the signal to the terminal or the base station through a transmission antenna.

Recently, in order to overcome the limitation of limited frequency resources and achieve high spectral efficiency in accordance with an increase in data capacity and a demand for high speed, a MIMO scheme using multiple antennas has been adopted in a relay device. It is also applied to the interference cancellation system relay device to solve the problem of oscillation and degradation by eliminating the feedback signals by the transmission antennas, that is, the signals transmitted through the transmitting antenna, to the receiving antenna through various paths. It is becoming a trend.

However, in the case of the MIMO scheme, the interference cancellation relay device includes an amplifier and an interference cancellation unit for each channel, thereby increasing the size of the interference cancellation relay device, increasing manufacturing costs, and increasing power consumption. There was a problem that causes economic burden and management difficulties in the operation of the interference cancellation device.

The technical problem of the present invention is that the service provider can easily achieve high frequency efficiency without economic burden as it is coupled to an adjacent SISO interference elimination relay without the direct adoption of the MIMO scheme and operated in the MIMO scheme. It is to provide a SISO interference cancellation relay device.

A relay device according to an aspect of the present invention is a relay device coupled to an adjacent relay device and having a first channel formed between a corresponding receive antenna and a transmit antenna, wherein the first device is a signal input to the first channel. An interference canceling unit configured to remove a first interference signal caused by a signal radiated through a channel and a second interference signal caused by a signal radiated from the coupled relay device, and output a first interference cancellation processing signal; Transmitting the first interference cancellation processing signal to a relay device, the first and second signals being input from the coupled relay device to a second channel formed between a corresponding receive antenna and a transmit antenna of the coupled relay device; And a signal sharing unit configured to receive a second interference cancellation processing signal from which the second interference signal has been removed.

In some embodiments, the interference cancellation unit may generate a first estimated signal corresponding to the first interference signal based on the first interference cancellation processing signal fed back, and the second interference signal may be transmitted from the signal sharing unit. A second estimated signal corresponding to the second interference signal may be generated based on the interference cancellation processing signal, and the first and second signals may be generated in a signal input to the first channel based on the first and second estimated signals. The first interference cancellation processing signal may be output by removing the two interference signals.

In some embodiments, the relay apparatus may further include a clock signal generator configured to generate a reference clock signal, and the interference canceling unit may include the first signal in a signal input to the first channel in response to the reference clock signal. And removing the second interference signal to output the first interference cancellation processing signal.

In some embodiments, one reception antenna and one transmission antenna for the first channel may be configured to have a single-input single-output (SISO) structure.

A relay device according to another aspect of the invention is coupled with an adjacent relay device having a first channel formed between a corresponding receive antenna and a transmit antenna, and having a second channel formed between the corresponding receive antenna and the transmit antenna. A relay device comprising: a first interference signal caused by a signal radiated from the coupled relay device and a second signal radiated through the second channel in a signal input from the coupled relay device to the first channel A signal sharing unit for receiving a first interference cancellation processing signal from which the interference signal has been removed, and an interference cancellation unit for removing the first and second interference signals from the signal input to the second channel and outputting a second interference cancellation processing signal. And recover a reference clock signal of the coupled relay device from the first interference cancellation process signal, and reference clock signal of the coupled relay device. A synchronization clock signal generator configured to generate a clock signal synchronized to a call, wherein the interference canceling unit removes the first and second interference signals from a signal input to the second channel in response to the clock signal, 2 Outputs an interference cancellation processing signal.

In some embodiments, the clock signal generation unit may include: a recovery unit recovering a reference clock signal of the coupled relay device from the first interference cancellation processing signal, and a control signal using the reference clock signal of the coupled relay device; And a generation unit generating the clock signal in response to the control signal, wherein the control unit compares the reference clock signal of the coupled relay device with the generated clock signal to control the control signal. You can generate a signal.

In some embodiments, the interference canceling unit may generate a first estimated signal corresponding to the first interference signal based on the first interference cancellation processing signal transmitted from the signal sharing unit, and feedback the second A second estimation signal corresponding to the second interference signal may be generated based on the interference cancellation processing signal, and the first and second signals may be generated in a signal input to the second channel based on the first and second estimation signals. The second interference cancellation processing signal may be output by removing the two interference signals.

In some embodiments, one reception antenna and one transmission antenna for the second channel may be configured to have a SISO structure.

The SISO interference cancellation relay device according to the technical spirit of the present invention may be coupled to another SISO interference cancellation relay device and operated in a MIMO scheme.

Accordingly, the service provider does not need to directly use the MIMO interference cancellation relay device, which requires an increase in manufacturing cost and power consumption due to a plurality of antennas, a plurality of interference cancellation units, a plurality of amplifiers, etc., compared to the SISO interference cancellation relay device. SISO interference elimination relay devices can be used to ensure high data rates and provide high quality services, thereby reducing the economic burden and difficulty of managing the service provider.

In addition, in an environment requiring high data rates, two SISO interference elimination relays are coupled and operated in a MIMO method, and in an environment requiring relatively low data rates, each SISO interference elimination relay device can be operated independently. This gives service providers the flexibility to respond to a variety of service environments.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a diagram illustrating a relay environment of a coupled relay device according to an embodiment of the inventive concept.

FIG. 2 is a block diagram schematically illustrating coupled relay devices according to an embodiment of the inventive concept.

3 and 4 are diagrams for describing an exemplary embodiment of the interference canceling unit in the first relay apparatus of FIG. 2.

FIG. 5 is a diagram for describing an implementation example of a synchronization clock signal generator in the second relay apparatus of FIG. 2.

The present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, numerals (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

In addition, the terms "~ unit", "~ group", "~ ruler", "~ module" as used herein refers to a unit for processing at least one function or operation, which means hardware or software or hardware and It can be implemented in a combination of software.

In addition, it is intended to clarify that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function. Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by.

Hereinafter, embodiments of the present invention will be described in detail.

1 is a diagram illustrating a relay environment of a coupled relay device according to an embodiment of the inventive concept. In FIG. 1, for convenience of description, a case where a downlink signal of a base station (BTS) is transmitted to a terminal MS through coupled

relay devices

10 and 20 will be described as an example. In addition, the

relay devices

10 and 20 are referred to as a first relay device and a second relay device, respectively, and donor antennas RX1 and RX2 of the

relay devices

10 and 20 that transmit and receive signals to and from the base station BTS are respectively referred to. The service antennas TX1 and TX2 of the

relay devices

10 and 20 that transmit and receive signals to and from the terminal MS through the reception antenna will be described as transmission antennas. The same applies to FIGS. 2 to 5 below. Meanwhile, in FIG. 1, two relay devices are illustrated as being coupled by way of example, but the inventive concept is not limited thereto, and at least three relay devices may be coupled.

Referring to FIG. 1, the first relay device 10 of the SISO method and the second relay device 20 of the SISO method may be coupled to operate as the relay device of the MIMO method. That is, the downlink signals of the base station BTS are formed in the first channel and / or in the second relay device 20 between the receive antenna RX1 and the transmit antenna TX1 in the first relay device 10. It may be transmitted to the terminal MS via a second channel formed between the RX2 and the transmit antenna TX2.

At this time, the signals transmitted through the transmission antenna TX1 of the first relay device 10 are received by the reception antenna RX1 of the first relay device 10 and the reception antenna of the second relay device 20 through a wireless environment. The first interference signal IS1 may be input to at least one of RX2. Similarly, the signals transmitted through the transmission antenna TX2 of the second relay device 20 are received through the wireless environment by the reception antenna RX1 of the first relay device 10 and the reception antenna of the second relay device 20 ( The second interference signal IS2 may be input to at least one of RX2. Accordingly, at least one of the first and second interference signals IS1 and IS2 is amplified by combining the downlink signal of the base station BTS, which is an original signal input to each of the reception antennas RX1 and RX2, to be amplified. The

second relay apparatuses

10 and 20 can oscillate. In order to solve this oscillation problem, the first relay device 10 includes an interference canceller 130 (see FIG. 2) capable of removing the first and second interference signals IS1 and IS2, and the second relay. The apparatus 20 includes an interference canceling unit 230 (see FIG. 2) capable of removing the first and second interference signals IS1 and IS2.

The first and

second relay apparatuses

10 and 20 share the output signals S1 and S2 of the

interference cancellers

130 and 230, and respectively, and output signals of the shared

interference cancellers

130 and 230, respectively. Based on S1 and S2, they may be synchronized with each other and the first and second interference signals IS1 and IS2 may be eliminated. This will be described in more detail with reference to FIG. 2 below.

FIG. 2 is a block diagram schematically illustrating coupled relay devices according to an embodiment of the inventive concept. In FIG. 2, as in FIG. 1, for convenience of explanation, each of the first and

second relay apparatuses

10 and 20 transmits a downlink signal of a base station BTS (see FIG. 1) to a terminal (MS, FIG. 1). Only the configurations for the transmission are shown. Configurations for transmitting the uplink signal of the terminal MS (see FIG. 1) to the base station (BTS, see FIG. 1) may correspond to the configurations for the transmission of the downlink signal. Detailed description of the configuration for the description will be omitted.

The first relay device 10 includes an analog / digital converter 110, an interference canceller 130, and a reference clock provided in a first channel formed between one receive antenna RX1 and one transmit antenna TX1. The signal generator 150, the signal sharer 170, and the digital / analog converter 190 may be included.

The analog / digital converter 110 may be connected to the reception antenna RX1. The analog / digital converter 110 may convert a signal input to the first channel through the reception antenna RX1 into a digital signal. The signal (hereinafter, referred to as a first received signal) input to the first channel is transmitted through a downlink signal of a base station (BTS) (see FIG. 1) and a signal transmitted through the first channel, for example, a transmission antenna TX1. At least one of a first interference signal by the radiated signal and a signal transmitted through the second channel of the second relay device 20, for example, a second interference signal by the signal radiating through the transmission antenna TX2. can do.

Although not shown in FIG. 2, between the receiving antenna RX1 and the analog / digital converting unit 110, a low noise amplifier for minimizing and amplifying noise of the first received signal and a low noise amplifier are provided. A frequency down converter may be arranged to convert the amplified first received signal into a signal of an intermediate frequency band in a signal of a radio frequency band. However, the frequency down converter may be optionally omitted.

The interference canceller 130 may be connected to the analog / digital converter 110. The interference canceller 130 may receive a first received signal converted into a digital signal from the analog / digital converter 110.

The interference cancellation unit 130 may receive its own output signal (hereinafter, referred to as a first interference cancellation processing signal S1). Here, the first interference cancellation processing signal S1 is a base station (BTS, FIG. 1) input to the original signal, that is, the first channel from which the first and second interference signals are removed from the digitally converted first received signal. Reference downlink signal).

The interference canceller 130 may receive the reference clock signal RCK from the reference clock signal generator 150. In addition, the interference cancellation unit 130 may receive an output signal (hereinafter, referred to as a second interference cancellation processing signal S2) of the interference cancellation unit 230 of the second relay device 20 from the signal sharing unit 130. have. Here, the second interference cancellation processing signal S2 is a circle in which the first and second interference signals are removed from a signal (hereinafter, a second reception signal) input to the second channel of the second relay device 20. The signal may be a downlink signal of a base station (BTS, see FIG. 1) input to the second channel.

In response to the reference clock signal RCK, the interference cancellation unit 130 may perform the first and second signals on the digitally converted first received signal based on the first and second interference cancellation processing signals S1 and S2. The first interference cancellation processing signal S1 from which the interference signal has been removed may be output. In detail, the interference cancelation unit 130 generates a first estimated signal corresponding to the first interference signal based on the first interference cancellation processing signal S1 fed back, and then generates a second interference cancellation processing signal S2. Generate a second estimated signal corresponding to the second interference signal, and remove the first and second interference signals from the digitally converted first received signal using the first and second estimated signals. The first interference cancellation processing signal S1 can be output.

The reference clock signal generator 150 may generate a reference clock signal RCK based on the applied reference voltage and transmit the generated reference clock signal RCK to the interference canceller 130. The reference clock signal generator 150 may be configured of, for example, a voltage controlled crystal oscillator.

The signal sharing unit 170 may receive the first interference cancellation processing signal S1 and transmit it to the second relay device 20, and input the second interference cancellation processing signal S2 from the second relay device 20. It can be received and transmitted to the interference cancellation unit 130. In detail, the signal sharing unit 170 may be interconnected with the signal sharing unit 270 of the second relay device 20 through a transmission medium, for example, a cable, and through the transmission medium, a first interference cancellation processing signal. S1 may be transmitted to the signal sharing unit 270, and the second interference elimination processing signal S2 may be received from the signal sharing unit 270 through the transmission medium and transmitted to the interference canceling unit 130.

The digital / analog converter 190 may be connected to the interference canceller 130. The digital / analog converter 190 may receive the first interference cancellation processing signal S1 from the interference cancellation unit 130 and convert the signal to an analog signal. The digital / analog converter 190 may be connected to the transmit antenna TX1, and converts the analog-converted first interference cancellation processing signal S1 to the terminal MS (see FIG. 1) through the transmit antenna TX1. I can send it out.

On the other hand, although not shown in Figure 2, between the interference canceling unit 130 and the digital / analog converter 190, a gain control unit for controlling the gain of the first interference cancellation processing signal (S1) and the first interference cancellation processing A pre-distorter for predistorting the signal S1 may be disposed. In addition, between the digital / analog converter 190 and the transmit antenna TX1, a frequency up converter for converting the analog-converted first interference cancellation processing signal S1 into a signal of a radio frequency band and the A power amplifier for amplifying and outputting the first interference cancellation processing signal S1 frequency upconverted by the frequency upconverter may be disposed. However, the frequency up converter may be optionally omitted.

The second relay device 20 includes an analog / digital converter 210, an interference canceller 230, and synchronization provided in the second channel formed between one receive antenna RX2 and one transmit antenna TX2. The clock signal generator 250, the signal sharer 270, and the digital / analog converter 290 may be included.

The analog / digital converter 210 may be connected to the reception antenna RX2. The analog / digital converter 210 may convert the second received signal into a digital signal through the receive antenna RX2. The second received signal may include at least one of a downlink signal of a base station (BTS) (see FIG. 1) and the first and second interference signals.

Although not shown in FIG. 2, as in the first relay device 10, a low noise amplifier and a frequency down converter are provided between the reception antenna RX2 and the analog / digital converter 210. Can be arranged. However, the frequency down converter may be optionally omitted.

The interference canceller 230 may be connected to the analog / digital converter 210. The interference canceller 230 may receive a second received signal converted into a digital signal from the analog / digital converter 210.

The interference canceller 230 may receive its own output signal, that is, the second interference cancellation processing signal S2. The interference canceller 230 may receive the clock signal SRCK generated in synchronization with the reference clock signal RCK from the synchronization clock signal generator 250. The interference cancellation unit 230 may receive the first interference cancellation processing signal S1 from the signal sharing unit 270.

The interference canceling unit 230, in response to a clock signal SRCK, performs the first and second interference on the digitally converted second received signal based on the first and second interference cancellation processing signals S1 and S2. The second interference cancellation processing signal S2 from which the signal is removed may be output. In detail, the interference cancellation unit 230 generates a first estimated signal corresponding to the first interference signal based on the first interference cancellation processing signal S1, and feeds back a second interference cancellation processing signal S2. Generate a second estimated signal corresponding to the second interference signal, and remove the first and second interference signals from the digitally converted second received signal using the first and second estimated signals. The second interference cancellation processing signal S2 can be output.

The synchronization clock signal generator 250 restores the reference clock signal RCK from the input first interference elimination processing signal S1, generates a clock signal SRCK synchronized with the reference clock signal RCK, and generates an interference agent. Send to reject 230. The synchronization clock signal generator 250 will be described in more detail with reference to FIG. 6 below.

The signal sharing unit 270 may receive the second interference cancellation processing signal S2 and transmit it to the first relay device 10, and input the first interference cancellation processing signal S1 from the first relay device 10. It may be received and transmitted to the interference cancellation unit 230. In detail, the signal sharing unit 270 may be interconnected with the signal sharing unit 170 of the first relay device 10 through a transmission medium, for example, a cable, and through the transmission medium, a second interference cancellation processing signal ( S2) may be transmitted to the signal sharing unit 170, and the first interference elimination processing signal S1 may be received from the signal sharing unit 170 through the transmission medium and transmitted to the interference canceling unit 230.

The digital / analog converter 290 may be connected to the interference canceller 230. The digital / analog converter 290 may receive the second interference cancellation processing signal S2 from the interference cancellation unit 230 and convert the second interference cancellation processing signal S2 into an analog signal. The digital / analog converter 290 may be connected to the transmit antenna TX2 and convert the analog-converted second interference cancellation processing signal S2 to the terminal MS (see FIG. 1) through the transmit antenna TX2. I can send it out.

Although not shown in FIG. 2, a gain controller and a predistorter may be disposed between the interference canceling unit 230 and the digital / analog converter 190 as in the first relay device 10. A frequency up converter and a power amplifier may be disposed between the digital / analog converter 190 and the transmit antenna TX1. However, the frequency up converter may be optionally omitted.

As such, the first relay device 10 and the second relay device 20 may be coupled and driven in a MIMO manner similar to one MIMO relay device. Accordingly, it is possible to implement the MIMO scheme with the SISO relays without directly using the MIMO relay device requiring manufacturing cost and power consumption, thereby reducing the economic burden and operational difficulties of the service provider. In addition, in an environment requiring a high data rate, the first and

second relay devices

10 and 20 are coupled and operated in a MIMO scheme, and in an environment requiring a relatively low data rate, the first and second relay devices 10 may be used. In addition, each can operate independently, allowing service providers to flexibly respond to a variety of service environments.

3 and 4 are diagrams for describing an exemplary embodiment of the interference canceling unit 130 in the first relay device 10 of FIG. 2. 3 is a block diagram schematically illustrating the interference canceller 130, and FIG. 4 is a diagram illustrating the first estimated signal generator 131_1 in more detail in the first processor PU1. 3 and 4, the components of the interference canceling unit 130 operate in response to the reference clock signal RCK, and the components operate in synchronization with the reference clock signal RCK. Since it is known at the time of application of the detailed description thereof will be omitted.

2, 3, and 4, the interference canceller 130 generates a first estimated signal based on the first interference canceling processing signal S1 to remove a first interference signal from an input signal. The second processor PU2 may be configured to generate a second estimated signal based on the first processor PU1 and the second interference canceling processing signal S2 to remove the second interference signal from the input signal.

The first and second processing units PU1 and PU2 may be serially connected to each other, and the first and second processing units PU1 and PU2 may be configured as estimation signal generators and removal units, respectively. Since the first and second processing units PU1 and PU2 are configured substantially the same, only the first processing unit PU1 will be described as an example for convenience of description.

The first processor PU1 may include a first estimation signal generator 131_1 and a first remover 133_1.

The first estimation signal generator 131_1 may include a delay unit 131_1a, a filter coefficient generator 131_1b, and a modeling unit 131_1c.

The delay unit 131_1a compensates for a delay from the first interference signal radiated from the transmission antenna TX1 to the feedback and input to the reception antenna RX1. The first interference cancellation processing signal S1 is performed. You can delay the output.

The filter coefficient generation unit 131_1b may receive the first interference elimination processing signal S1 and the first interference elimination processing signal S1 delayed by the delay unit 131_1a, and based on these, for example, LMS (least mean). Filter coefficients may be generated using an adaptive filter algorithm such as square or recursive least square (RLS).

The modeling unit 131_1c may receive a first interference cancellation processing signal S1 and the filter coefficient, and may perform the convolution operation using the first interference cancellation processing signal S1 and the filter coefficient to perform the first estimation signal. Can be generated. The modeling unit 131_1c may be configured as, for example, a finite impulse response (FIR) filter. Meanwhile, the first estimated signal may be substantially the same as the first interference signal when ideal.

The first remover 133_1 may generate an antiphase signal of the first estimated signal, and add the generated antiphase first estimated signal and the first received signal to the first interference signal in the first received signal. You can remove the signal. For example, the first remover 133_1 may be configured as a subtractor.

As such, the interference canceller 130 may be configured to sequentially remove the first and second interference signals from the first received signal, and in this case, a computation resource for removing the first and second interference signals. It is advantageous in terms of small size and easy implementation. However, the technical idea of the present invention is not limited thereto. Although not shown, the interference canceller 130 is configured such that the first processor PU1 and the second processor PU2 are connected in parallel to simultaneously remove the first and second interference signals from the first received signal. Of course it can be.

Meanwhile, referring to FIGS. 3 and 4, only one embodiment of the interference canceling unit 130 of the first relay device 10 has been described. However, the interference canceling unit 230 of the second relay device 20 may not interfere. Since it may have a configuration corresponding to the rejection 130, a detailed description of the interference cancellation unit 230 will be omitted.

FIG. 5 is a diagram for describing an implementation of the synchronization clock signal generator 250 in the second relay device 20 of FIG. 2.

Referring to FIG. 5, the synchronization clock signal generator 250 may include a restorer 271, a controller 272, and a generator 273.

The restoration unit 271 may restore the clock signal of the first relay device 10, that is, the reference clock signal RCK, from the first interference cancellation processing signal S1 transmitted from the first relay device 10. The reconstructor 271 may reconstruct the reference clock signal RCK based on transition periods of the bit stream constituting the first interference cancellation processing signal S1.

The controller 272 may generate the control signal CP using the restored reference clock signal RCK. In detail, the controller 272 may compare the frequency and phase of the restored reference clock signal RCK and the clock signal SRCK output from the generation unit 273, and based on the comparison result, the reference clock signal RCK Control signal CP for generating a clock signal synchronized with

The generator 273 may include an OP-AMP 274, a voltage controlled crystal oscillator (VCXO) 275, and a jitter cleaner 276, and may be synchronized with the reference clock signal RCK in response to the control signal CP. Generated clock signal SRCK. In detail, the OP-AMP 274 may function as an integrator to convert the control signal CP into a reference voltage, and the voltage controlled crystal oscillator 275 may generate a preliminary clock signal based on the reference voltage. have. The jitter cleaner 276 composed of the PLL 277 and the loop filter 278 may generate the clock signal SRCK by minimizing jitter of the preliminary clock signal.

In the above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications and changes by those skilled in the art within the spirit and scope of the present invention. This is possible.

Claims

A relay device coupled to an adjacent relay device and having a first channel formed between a corresponding receive antenna and a transmit antenna.

A first interference cancellation signal by removing a first interference signal due to a signal radiated through the first channel and a second interference signal due to a signal radiated from the coupled relay device from a signal input to the first channel An interference cancellation unit for outputting a; And

Transmitting the first interference cancellation processing signal to the coupled relay device, the signal being input from the coupled relay device to a second channel formed between the corresponding receive antenna and the transmit antenna of the coupled relay device; A signal sharing unit receiving a second interference cancellation processing signal from which the first and second interference signals are removed;

Including a relay device.
The method of claim 1, wherein the interference cancellation unit,

Generate a first estimated signal corresponding to the first interference signal based on the first interference cancellation processing signal fed back;

Generate a second estimated signal corresponding to the second interference signal based on the second interference cancellation processing signal transmitted from the signal sharing unit;

And outputting the first interference cancellation processing signal by removing the first and second interference signals from the signal input to the first channel based on the first and second estimated signals.
According to claim 1,

Further comprising: a clock signal generator for generating a reference clock signal,

And the interference canceling unit outputs the first interference cancellation processing signal by removing the first and second interference signals from a signal input to the first channel in response to the reference clock signal.
According to claim 1,

And one reception antenna and one transmission antenna for the first channel, each configured to have a single-input single-output (SISO) structure.
A relay device coupled with an adjacent relay device having a first channel formed between a corresponding receive antenna and a transmit antenna, the relay device comprising a second channel formed between a corresponding receive antenna and a transmit antenna.

The first interference signal by the signal radiated from the coupled relay device and the second interference signal by the signal radiated through the second channel are removed from the signal input from the coupled relay device to the first channel. A signal sharing unit receiving the first interference cancellation processing signal;

An interference canceling unit which removes the first and second interference signals from the signal input to the second channel and outputs a second interference cancellation processing signal; And

And a synchronization clock signal generator configured to recover a reference clock signal of the coupled relay device from the first interference cancellation processing signal and to generate a clock signal synchronized with the reference clock signal of the coupled relay device.

And the interference canceling unit removes the first and second interference signals from the signal input to the second channel in response to the clock signal and outputs the second interference cancellation processing signal.
The method of claim 5, wherein the clock signal generation unit,

A recovery unit for recovering a reference clock signal of the coupled relay device from the first interference cancellation processing signal;

A controller configured to generate a control signal using a reference clock signal of the coupled relay device; And

And a generator configured to generate the clock signal in response to the control signal.

And the control unit generates the control signal by comparing the generated clock signal with a reference clock signal of the coupled relay device.
The method of claim 5, wherein the interference cancellation unit,

Generate a first estimated signal corresponding to the first interference signal based on the first interference cancellation processing signal transmitted from the signal sharing unit,

Generate a second estimated signal corresponding to the second interference signal based on the second interference cancellation processing signal fed back;

And outputting the second interference cancellation processing signal by removing the first and second interference signals from the signal input to the second channel based on the first and second estimated signals.
The method of claim 5,

And one receiving antenna and one transmitting antenna for the second channel, each having a SISO structure.