WO2018124829A1 - Interference cancellation device, system and method using vector modulator - Google Patents

Abstract

Disclosed are an interference cancellation device used in a full-duplex wireless transmission/reception system, and an interference cancellation method executed by the interference cancellation device. The interference cancellation device, according to one embodiment, comprises at least one vector modulator which comprises passive devices and generates and outputs a self-interference cancellation signal for cancelling a self-interference signal by an analog transmission signal, by modifying the phase and size of an analog transmission signal component obtained by sampling the analog transmission signal in a full-duplex wireless transmission/reception system.

Description

Interference Cancellation Device, System and Method Using Vector Modulator

The following description relates to the field of transmission and reception of wireless signals, and more particularly to new and useful apparatus, systems and methods for magnetic interference cancellation.

This achievement is based on the ICT promising technology development support project of the Ministry of Science, ICT and Future Planning. Type), Research title: High-sensitivity technology for 79 GHz short-range radar for self-driving cars, Organized by: KYUI, Research Period: 2017.07.01 ~ 2017.12.31).

The wireless communication system or radar or the like includes a system for transmitting and receiving wireless signals for transmitting and receiving wireless signals. The radio spectrum required for a wireless communication system is a limited resource, and the rapid growth of wireless communication has resulted in a rapid increase in demand for such resources, and consequently, spectrum efficiency has become a very important factor in wireless communication systems. In addition, as research on autonomous vehicles has been actively conducted, there is an urgent need for improving the detection performance of radar, which is one of the sensors used in autonomous vehicles.

In such a situation, since a conventional wireless transmit / receive system is half duplex, in a conventional half duplex wireless transmit / receive system, a transmitter or receiver cannot simultaneously transmit and receive a signal on a single wireless channel.

Accordingly, in the field of wireless signal transmission and reception technology, full-duplex wireless transmission and reception technology has been proposed as one of solutions for increasing spectrum efficiency or improving detection performance of radar. Full-duplex wireless transmit / receive technology enables spectral efficiency to be doubled compared to conventional half-duplex wireless transmit / receive technology, and can significantly improve sensing performance by eliminating leaky signals from the radar system. If a full duplex wireless transmit / receive system is successfully implemented, it can provide enormous benefits to the field of using wireless transmit / receive techniques such as wireless communication or radar. For example, the use of full-duplex communications by cellular networks can reduce the spectrum requirements in half, and improve the radar performance when applying full-duplex radio transmission and reception techniques to the radar.

As such, the full-duplex wireless transmit / receive system is very valuable in contributing to the wireless communication field, but the full-duplex wireless transmit / receive system is not easy to implement due to a problem of magnetic interference or a solution. If reception and transmission are simultaneously performed on the same channel, the signal received at the receiver may include unwanted signal components (ie, magnetic interference signals or leakage signals) from the signal transmitted from the transceiver.

Accordingly, there is a need to create new and useful devices, systems, and methods that address the problem of magnetic interference or leakage of full-duplex wireless transmit / receive systems.

One embodiment provides a new and useful interference cancellation device used in a full duplex wireless transmit / receive system to solve the problem of magnetic interference or leakage.

Specifically, one embodiment includes a vector modulator composed of passive elements to generate and output a magnetic interference cancellation signal by varying the phase and magnitude of an analog transmission signal component, thereby minimizing the generation of noise caused by the use of active elements. An interference cancellation apparatus for improving interference performance, a full duplex wireless transmission / reception system including the interference cancellation apparatus, and an interference cancellation method using the interference cancellation apparatus are provided.

At this time, one embodiment of the present invention provides an interference canceling device for effectively eliminating magnetic interference by properly combining an in-phase component and a quadrature component with respect to a sampled analog transmission signal component. Provides a transmission and reception system and an interference cancellation method.

According to an embodiment, an interference cancellation apparatus used in a full duplex wireless transmission / reception system may be configured such that the analog transmission signal in the full duplex wireless transmission / reception system is configured with passive elements to change the phase and magnitude of the sampled analog transmission signal. And at least one vector modulator for generating and outputting a magnetic interference cancellation signal for canceling the magnetic interference signal by the analog transmission signal.

According to one aspect, the at least one vector modulator, by changing the phase and magnitude of the analog transmission signal component to form an in-phase component and a quadrature component for the analog transmission signal component The magnetic interference cancellation signal may be generated and output by combining the in-phase component and the quadrature component.

According to another aspect, the at least one vector modulator is configured to combine a signal component having a phase of 0 ° with respect to the analog transmission signal component and a signal component having a phase of 180 ° with respect to the analog transmission signal component to form the in-phase component. The quadrature component may be formed by combining a signal component having a phase of 90 ° with respect to the analog transmission signal component and a signal component having a phase of 270 ° with respect to the analog transmission signal component.

According to another aspect, the at least one vector modulator may adjust the magnitude of each of the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase of 180 ° with respect to the analog transmission signal component. Combining and determining the magnitude of the in-phase component, and adjusting the magnitude of each of the signal component having a phase of 90 ° with respect to the analog transmission signal component and the signal component having a phase of 270 ° with respect to the analog transmission signal component. The size of the quadrature component can be determined.

According to another aspect, the at least one vector modulator may sequentially order the magnitude of each of the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase of 180 ° with respect to the analog transmission signal component. Or by adjusting in reverse order to roughly determine the magnitude of the in-phase component and then finely determine the signal component having a phase of 90 ° with respect to the analog transmission signal component and a signal component having a phase of 270 ° with respect to the analog transmission signal component. Each size may be adjusted in order or in reverse order to roughly determine the size of the quadrature component and then finely determined.

According to another aspect, the interference cancellation device may further include at least one delayer for delaying the sampled analog transmission signal component.

According to another aspect, the number of the at least one delay unit is provided in the interference cancellation device, the number of inflow paths that the magnetic interference signal by the analog transmission signal is introduced into the analog reception signal in the full-duplex wireless transmission and reception system It can be determined according to.

According to another aspect, the interference canceling device, when a plurality of the at least one delay unit is provided, a splitter for separating the plurality of analog transmission signal components sampled by the analog transmission signal to each of the plurality of delay delayers; It may further include.

According to another aspect, the at least one vector modulator comprises: the passive elements for changing the phase and magnitude of the analog transmission signal component; And at least one combiner for combining and combining the output signal components output from the passive elements.

According to one embodiment, a full-duplex wireless transmit / receive system includes an RF transmitter for generating an analog transmission signal; A transmission coupler for sampling the analog transmission signal; An interference cancellation device for generating and outputting a magnetic interference cancellation signal for canceling the magnetic interference signal by the analog transmission signal; A reception coupler coupling the magnetic interference cancellation signal to an analog reception signal received from an antenna to remove components of the magnetic interference signal included in the analog reception signal; And an RF receiver for receiving the analog received signal from which the self-interference signal has been removed, wherein the interference canceling device is configured with passive elements to change the phase and magnitude of the analog transmitted signal component from which the analog transmitted signal is sampled. And at least one vector modulator for generating and outputting the magnetic interference cancellation signal.

According to an embodiment, an interference cancellation method performed in a full duplex wireless system includes: sampling an analog transmission signal in a transmission coupler included in the full duplex wireless system; And at least one vector modulator of the interference cancellation device included in the full duplex wireless system, wherein the at least one vector modulator consists of passive elements, wherein the phase and magnitude of the analog transmission signal component from which the analog transmission signal is sampled are changed. And generating and outputting a magnetic interference cancellation signal for canceling the magnetic interference signal by the analog transmission signal.

According to one aspect, the generating and outputting the magnetic interference cancellation signal, the phase and magnitude of the analog transmission signal component by changing the in-phase component and quadrature (quadrature) for the analog transmission signal component ) Forming a component; And combining the in-phase component and the quadrature component to generate and output the magnetic interference cancellation signal.

According to another aspect, the forming of the in-phase component and the quadrature component, the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase of 180 ° with respect to the analog transmission signal component Combining to form the in-phase component; And combining the signal component having a phase of 90 ° with respect to the analog transmission signal component and the signal component having a phase of 270 ° with respect to the analog transmission signal component to form the quadrature component.

According to another aspect, the forming of the in-phase component may include determining the magnitude of each of the signal component whose phase is 0 ° with respect to the analog transmission signal component and the signal component whose phase is 180 ° with respect to the analog transmission signal component. Adjusting and combining to determine the magnitude of the in-phase component, and forming the quadrature component includes a signal component having a phase of 90 ° relative to the analog transmission signal component and the analog transmission signal component. And adjusting the magnitude of each of the signal components having a phase of 270 ° with respect to each other and determining the magnitude of the quadrature component.

According to another aspect, the step of determining the magnitude of the in-phase component, the signal component having a phase of 0 ° for the analog transmission signal component and the signal component having a phase of 180 ° for the analog transmission signal component Determining the size of the quadrature component by roughly determining the size of the in-phase component by adjusting the magnitudes in order or in the reverse order, and determining the magnitude of the quadrature component by out-of-phase with respect to the analog transmission signal component. And roughly determining the magnitude of the quadrature component by adjusting the magnitude of each of the signal component having a 90 ° and the signal component having a phase of 270 ° with respect to the analog transmission signal component in order or in reverse order. Can be.

One embodiment may provide a new and useful interference cancellation device used in a full duplex wireless transmit / receive system to solve the problem of magnetic interference or leakage.

Specifically, one embodiment includes a vector modulator composed of passive elements to generate and output a magnetic interference cancellation signal by varying the phase and magnitude of an analog transmission signal component, thereby minimizing the generation of noise caused by the use of active elements. An interference cancellation apparatus for improving interference performance, a full duplex wireless transmission / reception system including the interference cancellation apparatus, and an interference cancellation method using the interference cancellation apparatus may be provided.

At this time, one embodiment of the present invention provides an interference canceling device for effectively eliminating magnetic interference by properly combining an in-phase component and a quadrature component with respect to a sampled analog transmission signal component. A transmission / reception system and an interference cancellation method may be provided.

1 is a diagram illustrating a full-duplex wireless transmission and reception system including digital and analog magnetic interference cancellation devices.

2 is a block diagram illustrating a full-duplex wireless transmission and reception system according to an embodiment.

3 illustrates a transmission signal and a magnetic interference signal on a complex plane (IQ plane).

4 is a view showing a conventional interference cancellation apparatus.

5 is a graph showing the characteristics of a 7-bit step attenuator.

6 is a table showing the characteristics of the 7-bit step attenuator.

7 is a view showing an embodiment for explaining the principle of interference signal cancellation using a conventional interference cancellation device.

8 is a view showing another embodiment for explaining the principle of interference cancellation using a conventional interference cancellation device.

9 is a block diagram illustrating an interference cancellation apparatus including a plurality of delayers, according to an exemplary embodiment.

10 is a circuit diagram illustrating an interference cancellation apparatus including a single delay unit according to an embodiment.

FIG. 11 is a block diagram illustrating a vector modulator included in the interference cancellation apparatus described above with reference to FIGS. 9 to 10.

12 is a view for explaining a principle of interference cancellation of the interference cancellation apparatus of FIG.

FIG. 13 is a diagram illustrating an example for explaining an interference signal cancellation principle using an interference cancellation apparatus according to an embodiment.

14 is a flowchart illustrating an interference cancellation method according to an exemplary embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. Also, like reference numerals in the drawings denote like elements.

In addition, terms used in the present specification are terms used to properly express preferred embodiments of the present invention, which may vary depending on the intention of the viewer, the operator, or customs in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

Embodiments described herein relate to an interference cancellation technology included in a full-duplex wireless transmit / receive system. The interference elimination apparatus included in the full-duplex wireless transmit / receive system is configured by passive elements, thereby generating magnetic interference or Solve the problem of liquidity. Hereinafter, the passive element is not limited to a resistor, an inductor, or a capacitor, and any element or several elements that perform a passive elemental function such as attenuation of a signal without functionally performing a substantially active element such as amplification or oscillation. Means a combination.

1 is a diagram illustrating a full-duplex wireless transmission and reception system including digital and analog magnetic interference cancellation devices.

Referring to FIG. 1, a full-duplex wireless communication system is a promising solution for increasing spectral efficiency. That is, the full-duplex wireless communication system refers to a full-duplex wireless transmission / reception system 100, which is a wireless communication system capable of simultaneously transmitting and receiving wireless signals on the same wireless channel. The full duplex wireless transmission / reception system 100 may include various communication systems such as a radar system and a cellular communication system.

The full duplex wireless transmit / receive system 100 theoretically doubles the spectral efficiency compared to a standard half duplex wireless transmit / receive system. In addition, when full-duplex transmission and reception technology is applied to the radar, the detection performance of the radar may be improved by minimizing the influence of the leakage signal on the received signal.

However, since the full duplex system 100 receives and transmits simultaneously on the same channel, the signal received at the full duplex system 100 may include unwanted signal components from the signal transmitted from the transceiver. . For example, in the full-duplex wireless transmit / receive system 100, a signal transmitted along the transmission path 110 and a signal received along the reception path 120 generate interference with each other (self-interference).

Accordingly, the full-duplex wireless transmission / reception system may include a digital magnetic interference cancellation device 130 for removing magnetic interference in the digital domain and / or an analog magnetic interference cancellation device 140 for removing magnetic interference in the analog domain. Hereinafter, the digital magnetic interference cancellation device 130 will be briefly described as a digital interference cancellation device, and the analog magnetic interference cancellation device 140 will be described as an analog interference cancellation device.

On the other hand, the full-duplex wireless transmit / receive system 100 may preferably sample the transmission signal as a baseband digital signal or a radio frequency (RF) analog signal. The analog transmission signal component in which the analog transmission signal is sampled may be utilized to remove the magnetic interference signal included in the analog reception signal received by the full duplex wireless transmission / reception system 100 from the transceiver. In one example, in the full-duplex wireless transmit / receive system 100, the interference canceling apparatus may add the delayed and scaled versions of the RF transmission signal to generate an RF magnetic interference cancellation signal and then subtract it from the RF received signal, thereby removing the magnetic interference signal. have.

At this time, the path through which the magnetic interference signal is introduced into the analog received signal may be one or more. Therefore, the magnetic interference signal included in the analog received signal may be composed of several components having different inflow paths. It is effective to reduce magnetic interference on the analog domain in the case of a component of the magnetic interference signal having a small time delay with the analog transmission signal. On the other hand, in the case of a component having a large time delay with an analog transmission signal among magnetic interference signal components, it is desirable to reduce magnetic interference on the digital domain.

Hereinafter, the interference cancellation apparatus included in the full-duplex wireless transmission / reception system according to the exemplary embodiment described below is an analog interference cancellation apparatus 140 for removing magnetic interference on the analog domain, and is briefly described as an interference cancellation apparatus.

2 is a block diagram illustrating a full-duplex wireless transmission and reception system according to an embodiment.

Referring to FIG. 2, the full-duplex wireless transmission / reception system 200 according to an embodiment may include an RF transmitter 210 for generating an analog transmission signal and outputting the antenna to an antenna, a component 220 for removing magnetic interference in the analog domain, and The RF receiver 230 may receive an analog received signal from which the magnetic interference signal is removed (a signal from which the magnetic interference signal is removed from the analog received signal received from the antenna). However, the present disclosure is not limited thereto, and the full-duplex wireless transmit / receive system 200 may be implemented in various structures including a component 220 for removing magnetic interference in the analog domain.

The component 220 for magnetic interference cancellation in the analog domain may include a transmission coupler 221, a delay adjuster 222, an interference cancellation device 223, an amplifier 224, and a reception coupler 225. Here, the transmission coupler 221 may sample the analog transmission signal generated by the RF transmitter and output an analog transmission signal component. Delay adjuster 222 may process the analog transmit signal component to adjust and match the delay of the analog transmit signal component. At this time, the delay adjuster 222 may be excluded from the configuration unit 220 for the magnetic interference cancellation in the analog domain according to the implementation manner, it may be provided at the rear end of the interference cancellation device 223, not the front end.

The interference canceling device 223 generates and outputs a magnetic interference cancellation signal for canceling the magnetic interference signal by the analog transmission signal. More specifically, the interference cancellation device 223 is configured of passive elements to change the phase and magnitude of the analog transmission signal component to generate at least one magnetic interference cancellation signal similar in magnitude and phase to the magnetic interference signal. It may include a vector modulator of. At this time, delay matching and amplitude matching between the magnetic interference signal and the magnetic interference cancellation signal may help the magnetic interference cancellation to be performed more effectively. For example, in a full-duplex wireless transmit / receive system 200 in which the RF reflection characteristic is very dynamic and a large part of the magnetic interference is generated from the reflected transmission signal, changes in the environment greatly increase the delay and attenuation of the magnetic interference signal component of the received signal. Can change. Accordingly, the delay adjuster 222 and the interference canceling device 223 may operate so that the magnetic interference cancellation signal is delay matched and amplitude matched to the magnetic interference signal. Detailed description thereof will be described with reference to FIGS. 9 to 14.

As such, the magnetic interference cancellation signal output from the interference cancellation device 223 is amplified by the amplifier 224 and then transferred to the reception coupler 225. Here, the amplifier 224 may be excluded from the component 220 for removing the magnetic interference in the analog domain according to the implementation manner, or the position provided in the component 220 may be adaptively adjusted.

The reception coupler 225 may remove a component of the magnetic interference signal included in the analog reception signal by coupling the magnetic interference cancellation signal to the analog reception signal received from the antenna.

As described above, the full-duplex wireless transmission / reception system 200 according to an embodiment includes the interference cancellation device 223 composed of passive elements, thereby minimizing noise generation due to the use of active elements and solving the problem of magnetic interference.

3 illustrates a transmission signal and a magnetic interference signal on a complex plane (IQ plane).

Referring to FIG. 3, a transmission signal 310 and a magnetic interference signal 320 in a full duplex wireless transmission / reception system have a close relationship with each other.

For example, if the radius P _T of the circle A represents the magnitude of the transmission signal 310 in the full-duplex wireless transmission / reception system, and θ represents the phase of the transmission signal 310, the transmission signal 310 is equal to the magnitude of P _T. It can be represented by a vector having a phase of θ. On the other hand, since the magnetic interference signal 320 is a portion of the transmission signal 310 is introduced into the receiver of the full-duplex wireless transmission and reception system, the size of the magnetic interference signal 320 is smaller than the power of the transmission signal 310 and the magnetic The phase of the interference signal 320 has a value that varies with time depending on the inflow path through which a portion of the transmission signal 310 flows, the surrounding environment such as temperature, and the characteristics of the devices used in the full-duplex wireless transmission / reception system. Therefore, when the vector of the magnetic interference signal 320 is represented by the magnitude of P _I and the phase of φ, the magnetic interference signal 320 may appear as a vector having an angle of φ on a circle B having a radius of P _I. .

Since the magnetic indirect signal 320 is closely related to the transmission signal 310, the full-duplex wireless transmission / reception system uses a vector modulator to maximize the magnitude and phase of the magnetic interference signal 320 based on the transmission signal 310. By generating and outputting a similar magnetic interference cancellation signal, the magnetic interference signal 320 can be eliminated. A description of the magnetic interference cancellation method using this principle will be described below.

4 is a view showing a conventional interference cancellation apparatus.

Referring to FIG. 4, the conventional interference elimination apparatus 400 includes a vector modulator 410 and a controller configured to generate and output a magnetic interference cancellation signal by changing phases and magnitudes of analog transmission signal components while being configured as switches S1 to S4. 420. Hereinafter, the control unit 420 included in the interference cancellation apparatus 400 is described as having a role of controlling the operation of the vector modulator 410 (for example, an operation of changing the phase and magnitude of the analog transmission signal component). In some cases, the interference cancellation apparatus 400 may be implemented in a form included in a processor of a full-duplex wireless transmission / reception system used or omitted from the full-duplex wireless transmission / reception system. When the controller 420 is omitted from the full-duplex wireless transmission / reception system, the vector modulators 410 may play a role of the controller 420.

The vector modulator 410 of the conventional interference canceling apparatus 400 changes the phase of an analog transmission signal component as an input signal so that the signal component I ₁ having a phase of 0 ° for the analog transmission signal component and the phase for the analog transmission signal component The signal component Q ₁ which is 90 degrees, the signal component I ₂ whose phase is 180 degrees with respect to the analog transmission signal component, and the signal component Q ₂ whose phase is 270 degrees with respect to the analog transmission signal component can be formed.

Subsequently, the control unit 420 of the conventional interference canceling apparatus 400 determines whether the magnetic interference signal is in the quadrant, which is an in-phase component I ₁ and I ₂ with respect to the analog transmission signal component. Only one of them may be selected, and only one of Q ₁ and Q ₂ , which are quadrature components of the analog transmission signal component, may be selected. For example, the controller 420 may select only one of I ₁ and I ₂ and select only one of Q ₁ and Q ₂ using the switches S1 to S4 constituting the vector modulator 410.

The vector modulator 410 then generates and outputs a magnetic interference cancellation signal by adjusting and combining the size of any one selected from I ₁ and I ₂ and the selected one of Q ₁ and Q ₂ . Can be. Here, the one of the components selected from I ₁ and I ₂ and the size of each of the components selected from Q ₁ and Q ₂ are adjusted, may be combined by a combiner and output as an output signal.

At this time, the vector modulator 410 may be configured to include a bit step attenuator to change the phase of the analog transmission signal component. A detailed description of such a bit step attenuator will be described with reference to FIGS. 5 to 6.

As such, the conventional interference cancellation apparatus 400 generates and outputs a magnetic interference cancellation signal in consideration of only one component selected from I ₁ and I ₂ and any one selected from Q ₁ and Q ₂ . An error between the magnitude and phase of the cancellation signal and the magnitude and phase of the magnetic interference signal has a big disadvantage.

5 is a graph showing the characteristics of the 7-bit step attenuator, Figure 6 is a table showing the characteristics of the 7-bit step attenuator.

Referring to FIG. 5, the step attenuator is an element that attenuates the magnitude of the signal, and may change the attenuation of the signal separately, not continuously.

In FIG. 5, the left graph 510 has 128 steps, and ideally, when the amount of attenuation of the signal per step is 0.25 dB, the amount of attenuation according to the step index of the step attenuator is expressed in dB scale. In FIG. 5, the right graph 520 has 128 steps. Ideally, when the attenuation amount of the signal per step is 0.25 dB, the power and magnitude of the signal according to the step index of the step attenuator are represented on a linear scale.

When the magnitude of the signal reduced by the step attenuator is represented by a linear scale instead of a dB scale, as shown in FIG. 5, it can be seen that the magnitude of the signal changes geometrically as the step index is changed. For example, even if the signal attenuation is equal to 0.25 dB, it can be seen that when the signal is large, the magnitude of the signal is large, whereas when the signal is small, the magnitude of the signal is small. This characteristic of the step attenuator makes it difficult to fine tune the signal when the signal is large.

FIG. 6 is a table illustrating attenuation characteristics of an ideal step attenuator having a step amount of 0.25 dB, which is composed of 128 steps shown in the graphs 510 and 520 of FIG. 5. Specifically, when the amplitude (amplitude) of the signal before passing through the attenuator is 1, the table shows the magnitude of the signal after the step attenuator for a given index value (0 to 127).

7 is a view showing an embodiment for explaining the principle of interference signal cancellation using a conventional interference cancellation device.

Assuming that the magnetic interference signal 710 is in one quadrant of the complex plane as shown in FIG. 7, the control unit included in the interference cancellation apparatus described above with reference to FIG. 4 turns on S1 and S2 of the switches S1 to S4. setting, set S3 and S4 to the oFF (off) by selecting the I ₁ and Q ₁ and I ₂ and Q ₂ is not selected.

Then, the control is to select the I ₁ = n1 (bit step attenuation index of the attenuator corresponding to I ₁₎ attenuation index (attenuation index) for I ₁ and selecting Q ₁ = n2 attenuation index of Q ₁ of magnetic interference The magnetic interference cancellation signal 720 may be generated such that the difference between the signal 710 and the magnetic interference cancellation signal 720 is the smallest.

However, the conventional method of eliminating interference includes I ₁ , I ₂ , Since the magnetic interference cancellation signal 720 is generated using only two components of I ₁ and Q ₁ without using all four of Q ₁ and Q ₂ , the in-phase error component Δ1 and the quadrature error component Δ2 can be very large.

8 is a view showing another embodiment for explaining the principle of interference cancellation using a conventional interference cancellation device.

Assuming that the magnetic interference signal 810 is in two quadrants of the complex plane as shown in FIG. 8, the controller included in the interference cancellation apparatus described above with reference to FIG. 4 turns on S2 and S3 of the switches S1 to S4. Set, S1 and S4 are set to off to select I ₂ and Q ₁ , and I ₁ and Q ₂ are not selected.

Then, the control is to select the I ₂ = n3 (bit step attenuation index of the attenuator corresponding to the I ₂₎ attenuation index (attenuation index) for the I ₂ and select the Q ₁ = n4 attenuation index of Q1 magnetic interference signal The magnetic interference cancellation signal 820 may be generated such that the difference between 810 and the magnetic interference cancellation signal 820 is the smallest.

However, the conventional method of eliminating interference includes I ₁ , I ₂ , Since the magnetic interference cancellation signal 820 is generated using only two components of in-phase components I ₂ and Q ₁ without using all four Q ₁ and Q ₂ , the in-phase error component Δ3 and quadrature The error component Δ4 can be very large.

9 is a block diagram illustrating an interference cancellation apparatus including a plurality of delayers, according to an exemplary embodiment.

Referring to FIG. 9, the interference canceling apparatus 900 according to an embodiment includes a divider 910, a plurality of delayers 920, 930, and 940, a plurality of vector modulators 950, 960, and 970. A binner 980 and a controller 990 are included.

The distributor 910 separates a plurality of analog transmission signal components sampled from an analog transmission signal from a transmission coupler included in a full-duplex wireless transmission / reception system using the interference canceling apparatus 900, and thus provides a plurality of delayers 920, 930, and 940. Each can be passed For example, the divider 910 separates a plurality of analog transmission signal components having the same power and the same waveform as the analog transmission signal, and divides the first analog transmission signal component among the plurality of analog transmission signal components into a first delayer ( 920, a second analog transmission signal component to the second delayer 930, and a third analog transmission signal component to the third delayer 940. Such a divider 910 may additionally include any electronic device (eg, an amplifier to amplify the power of the analog transmit signal) for preprocessing the analog transmit signal.

The plurality of delayers 920, 930, and 940 may delay the analog transmission signal components delivered to each. For example, the first delayer 920 delays the first analog transmission signal component delivered from the distributor 910 and the second delayer 930 transmits the second analog transmission signal component transmitted from the distributor 910. The third delayer 940 may delay the third analog transmission signal component delivered from the distributor 910. Here, an analog delay circuit (for example, bucket brigade device, long transmission line RC network series, etc.) may be used as each of the plurality of delayers 920, 930, and 940, but the present invention is not limited thereto. The circuit of can be used.

In this case, each of the plurality of delayers 920, 930, and 940 may delay the analog transmission signal component using a fixed delay value or a variable delay value. In this case, the variable delay values may be controlled by the controller 990.

Although the number of the plurality of delayers 920, 930, and 940 is illustrated in FIG. 3, the present invention is not limited thereto or limited thereto, and the plurality of delayers 920, 930, and 940 may include the interference cancellation device 900. The number provided at may be determined according to the number of inflow paths through which the magnetic interference signal by the analog transmission signal is introduced into the analog reception signal. For example, the number of delay units 920, 930, and 940 provided may be determined to be equal to the number of inflow paths through which the magnetic interference signal flows into the analog reception signal. Accordingly, the divider 910 may separate the analog transmission signal components and transmit the same to the plurality of delayers 920, 930, and 940 in the same manner as the number of paths through which the magnetic interference signal enters the analog reception signal.

Each of the plurality of vector modulators 950, 960, and 970 changes the phase and magnitude of an analog transmission signal component output from each of the plurality of delayers 920, 930, and 940 to generate and generate a magnetic interference cancellation signal component. You can print Here, the magnetic interference cancellation signal component is a component constituting the magnetic interference cancellation signal for removing the magnetic interference signal by the analog transmission signal, the magnetic interference cancellation signal component output from each of the plurality of vector modulators (950, 960, 970) The combiner 980 may be combined to form a magnetic interference cancellation signal. For example, the first vector modulator 950 changes the phase and magnitude of the first analog transmission signal component output from the first delayer 920 to generate and output the first magnetic interference cancellation signal component, and the second The vector modulator 960 generates and outputs a second magnetic interference cancellation signal component by changing the phase and magnitude of the second analog transmission signal component output from the second delayer 930, and the third vector modulator 970 The phase and magnitude of the third analog transmission signal component output from the third delayer 940 may be changed to generate and output a third magnetic interference cancellation signal component.

Each of the plurality of vector modulators 950, 960, and 970 generates and outputs a magnetic interference cancellation signal component by changing a phase and a magnitude of an analog transmission signal component as follows. Each of the plurality of vector modulators 950, 960, and 970 changes the phase and magnitude of the analog transmission signal component to form an in-phase component and a quadrature component with respect to the analog transmission signal component, and generates the in-phase component and the quadrature component. Can be combined to generate and output magnetic interference cancellation signal components. For example, each of the plurality of vector modulators 950, 960, and 970 each has a signal component I ₁ with a phase of 0 ° for an analog transmission signal component and a signal component I ₂ with a phase of 180 ° for an analog transmission signal component. After creation, the size of each of I ₁ and I ₂ can be adjusted to combine to form an in-phase component of a specific size. Each of the plurality of vector modulators 950, 960, 970 then generates a signal component Q ₁ with a phase of 90 ° for the analog transmit signal component and a signal component Q ₂ with a phase of 270 ° for the analog transmit signal component. Afterwards, by adjusting and combining the sizes of each of Q ₁ and Q ₂ , a quadrature component having a specific size can be formed. Accordingly, each of the plurality of vector modulators 950, 960, and 970 may generate and output a magnetic interference cancellation signal component by combining an in-phase component and a quadrature component. As a more specific example, the first vector modulator 950 generates and combines I ₁ and I ₂ for the first analog transmit signal component to form an in-phase component and then Q ₁ for the first analog transmit signal component. And Q ₂ may be generated and combined to form a quadrature component of a specific size, whereby the in-phase component and the quadrature component may be combined to generate and output a first magnetic interference cancellation signal component. Similarly, the second vector modulator 960 generates and combines I ₁ and I ₂ for the second analog transmission signal component to form an in-phase component, and then Q ₁ and Q ₂ for the second analog transmission signal component. By generating and combining to form a quadrature component of a specific size, the in-phase component and the quadrature component may be combined to generate and output a second magnetic interference cancellation signal component, and the third vector modulator 970 may include a third analog signal. By generating and combining I ₁ and I ₂ for the transmit signal components to form in-phase components, and then generating and combining Q ₁ and Q ₂ for the third analog transmit signal component to form quadrature components of a particular magnitude. The third magnetic interference cancellation signal component may be generated and output by combining the in-phase component and the quadrature component.

A detailed description of each of the plurality of vector modulators 950, 960, and 970 operating as described above will be described with reference to FIG. 11.

The combiner 980 may output a magnetic interference cancellation signal by combining the magnetic interference cancellation signal components output from the plurality of vector modulators 950, 960, and 970. Accordingly, the reception coupler included in the full-duplex wireless transmission / reception system using the interference cancellation apparatus 900 may couple the magnetic interference cancellation signal output from the combiner 980 to the analog reception signal to be included in the analog reception signal. You can remove the signal.

The controller 990 controls the operation of each of the plurality of vector modulators 950, 960, and 970 (for example, an operation of changing a phase and a magnitude of an analog transmission signal component). In addition, the controller 990 may serve to control configuration parameters of the interference canceling apparatus 900. Inputs to the control unit 990 include signal data (e.g., analog transmit signal, digital transmit signal, analog receive signal), full duplex radio settings (e.g. RF transmitter power, antenna position), full duplex radio characteristics (e.g. receiver operation) Characteristics, transmitter operating characteristics), environmental data (eg, transceiver temperature, ambient temperature, ambient humidity) and / or other input related to magnetic interference present in the analog received signal. In some cases, the controller 990 may be implemented in a form of a processor of a full-duplex wireless transmission / reception system using the interference elimination apparatus 900 or may be omitted from a full-duplex wireless transmission / reception system. When the controller 990 is omitted from the full-duplex wireless transmission / reception system, the role of the controller 990 may be performed by each of the plurality of vector modulators 950, 960, and 970.

10 is a circuit diagram illustrating an interference cancellation apparatus including a single delay unit according to an embodiment.

Referring to FIG. 10, an interference cancellation apparatus 1000 according to an embodiment includes a delayer 1010, a vector modulator 1020, and a controller 1030.

The delayer 1010 may delay an analog transmission signal component sampled from an analog transmission signal in a transmission coupler included in a full duplex wireless transmission / reception system using the interference elimination apparatus 1000. In this case, an analog delay circuit (eg, a bucket brigade device, a long transmission line RC network series, etc.) may be used as the delay unit 1010, and other circuits may be used without being limited thereto.

In this case, the delay unit 1010 may delay the analog transmission signal component using a fixed delay value or a variable delay value. In this case, the variable delay values may be controlled by the controller 1030.

Hereinafter, the interference elimination apparatus 1000 will be described as including a single delay unit 1010 as shown in the case where the number of inflow paths through which the magnetic interference signal by the analog transmission signal is introduced into the analog reception signal is one. do.

The vector modulator 1020 may generate and output a magnetic interference cancellation signal by changing a phase and a magnitude of an analog transmission signal component output from the delay unit 1010. Here, the magnetic interference cancellation signal is a signal for removing the magnetic interference signal by the analog transmission signal, and means a signal similar in magnitude and phase to the magnetic interference signal.

Specifically, the vector modulator 1020 changes the phase and magnitude of the analog transmission signal component to form an in-phase component and a quadrature component with respect to the analog transmission signal component, and removes magnetic interference by combining the in-phase component and the quadrature component. Signals can be generated and output. For example, vector modulator 1020 generates signal component I ₁ with a phase of 0 ° for an analog transmit signal component and signal component I ₂ with a phase of 180 ° for an analog transmit signal component, followed by I ₁ and I ₂ By controlling the size of each combination, it is possible to form a phase component of a specific size. Subsequently, the vector modulator 1020 generates a signal component Q ₁ having a phase of 90 ° with respect to the analog transmission signal component and a signal component Q ₂ having a phase of 270 ° with respect to the analog transmission signal component, and then Q ₁ and Q _2, respectively. By controlling the size of and combine, it is possible to form a quadrature component of a specific size. Accordingly, the vector modulator 1020 may generate and output a magnetic interference cancellation signal by combining the in-phase component and the quadrature component. A detailed description of the vector modulator 1020 operating as described above will be described with reference to FIG. 11.

Therefore, the reception coupler included in the full-duplex wireless transmission / reception system using the interference elimination apparatus 1000 may couple the magnetic interference cancellation signal output from the vector modulator 1020 to the analog reception signal and include the magnetic interference signal included in the analog reception signal. Can be removed.

The controller 1030 controls the operation of the vector modulator 1020 (for example, an operation of changing a phase and a magnitude of an analog transmission signal component). In addition, the controller 1030 may serve to control configuration parameters of the interference elimination apparatus 1000. Inputs to the controller 1030 include signal data (e.g., analog transmit signal, digital transmit signal, analog receive signal), full duplex radio settings (e.g. RF transmitter power, antenna position), full duplex radio characteristics (e.g. receiver operation) Characteristics, transmitter operating characteristics), environmental data (eg, transceiver temperature, ambient temperature, ambient humidity) and / or other input related to magnetic interference present in the analog received signal. In some cases, the controller 1030 may be implemented in a form of a processor of a full-duplex wireless transmission / reception system using the interference elimination apparatus 1000 or may be omitted from a full-duplex wireless transmission / reception system. When the controller 1030 is omitted from the full duplex wireless transmission / reception system, the role of the controller 1030 may be performed by the vector modulator 1020 itself.

FIG. 11 is a block diagram illustrating a vector modulator included in the interference cancellation apparatus described above with reference to FIGS. 9 to 10.

Referring to FIG. 11, the vector modulator 1100 according to an exemplary embodiment shows the structure of each of the plurality of vector modulators described above with reference to FIG. 9 or the structure of the vector modulator described above with reference to FIG. 10.

The vector modulator 1100 is composed of passive elements 1110, 1120, 1130, and 1140, and changes the phase and magnitude of the analog transmission signal component in which the analog transmission signal is sampled, thereby removing the magnetic interference cancellation signal (magnetic interference by the analog transmission signal). Signal to remove the signal) and output. Hereinafter, the vector modulator 1100 is described as being composed of passive elements 1110, 1120, 1130, and 1140 and combiner 1150 of four step attenuators, but is not limited thereto. It can be implemented to include a variety of components that can combine the output of the passive components with various passive components that can change phase and magnitude.

More specifically, the vector modulator 1100 changes the phase and magnitude of the analog transmission signal component to form an in-phase component and a quadrature component with respect to the analog transmission signal component, and combines the in-phase component and the quadrature component with magnetic interference. A cancel signal can be generated and output. For example, the vector modulator 1100 combines signal component I ₁ having a phase of 0 ° with respect to the analog transmission signal component and signal component I ₂ having a phase of 180 ° with respect to the analog transmission signal component to form an in-phase component. A quadrature component is formed by combining a signal component Q ₁ having a phase of 90 ° with respect to the analog transmission signal component and a signal component Q ₂ having a phase of 270 ° with respect to the analog transmission signal component, and then forming an in-phase component and a quadrature component. Can be combined to generate and output a magnetic interference cancellation signal. As a more specific example, the vector modulator 1100 changes the phase of the analog transmission signal component through the first passive element 1110 to generate I _1, and generates the I ₁ through the second passive element 1120. The phase is changed to generate Q ₁ , the phase of the analog transmit signal component is changed through the third passive element 1130 to generate I ₂ , and the phase of the analog transmit signal component is changed through the fourth passive element 1140. Can be changed to generate Q ₂ .

In this case, the vector modulator 1100 may generate I ₁ , I ₂ Q _1, and Q ₂ , which are ideally the same in size and have a phase difference of 90 ° from each other. Thus, I ₁ and I ₂ ideally have a relationship of I ₁ = -I ₂ with a phase difference of 180 ° between each other, and Q ₁ and Q ₂ ideally have Q ₁ = -Q with a phase difference of 180 ° between each other. _Has a relationship of ₂ .

Here, the vector modulator 1100 adjusts the sizes of I ₁ and I ₂ and combines them to determine the size of the in-phase components, and adjusts the sizes of Q ₁ and Q _2, respectively, and combines the sizes of the quadrature components. By determining, it is possible to adaptively adjust the phase and magnitude of the magnetic interference cancellation signal. In particular, the vector modulator 1100 adjusts the sizes of I ₁ and I ₂ in order or in reverse order to roughly determine the size of the in-phase component and then finely determines the size of each of Q ₁ and Q ₂ in order. Or by adjusting in reverse order to roughly determine the size of the quadrature component can be determined in detail. For example, the vector modulator 1100 adjusts the size of any one of I ₁ and I ₂ to roughly determine the size of the in-phase component in a predetermined unit and then adjusts the size of the other of I ₁ and I ₂ . The size of the in-phase component can be finely determined in units less than a predetermined unit. Similarly, the vector modulator 1100 Q ₁ and Q ₂ of the one to control the size of the orthogonal dimension of the phase component group to a set unit to approximately the rear Q ₁ and Q ₂ of the control either the size of the rest determined by the quadrature The size of the component can be finely determined in units less than a predetermined unit. Detailed description thereof will be described with reference to FIG. 12.

The combiner 1150 combines and combines output signal components output from each of the passive elements 1110, 1120, 1130, and 1140. For example, the combiner 1150 combines the adjusted I ₁ output from the first passive element 1110 and the adjusted I ₂ output from the third passive element 1130 to obtain a copper having a specific size. A phase component is formed, and a quadrature component having a specific size is formed by combining the scaled Q ₁ output from the second passive element 1120 and the scaled Q ₂ output from the fourth passive element 1140. Thus, the magnetic interference cancellation signal can be generated and output by combining the in-phase component and the quadrature component. The combiner 1150 may be an independent separate combiner in which the vector modulator 1100 is distinguished from the combiner described with reference to FIG. 9.

As such, the vector modulator 1100 according to an embodiment selects only one of I ₁ and I ₂ and selects any one of Q ₁ and Q ₂ as in the conventional vector modulator, thereby magnetic interference with two signal components. Rather than generating a cancellation signal, I ₁ , I ₂ Q ₁ and Q ₂ are combined to generate a magnetic interference cancellation signal.

Accordingly, the vector modulator 1100 according to an embodiment may omit the process of determining which quadrant the magnetic interference signal is in the complex plane in the conventional vector modulator, and select only one of I ₁ and I ₂ . instead, the switch for selecting any of Q ₁ and Q ₂ only one, I _1, I ₂ has the advantage that can be configured only of passive elements to change the size of Q ₁ and Q _2.

In addition, the vector modulator 1100 according to an embodiment may roughly adjust the size of each of the in-phase component and the quadrature component by using all of I ₁ , I ₂ Q _1, and Q ₂ , and then finely adjust one more time. It can aim at technical effect. Therefore, each of the in-phase and quadrature components formed by the vector modulator 1100 according to an embodiment may have a very high and accurate similarity with each of the in-phase and quadrature components of the magnetic interference signal.

12 is a view for explaining a principle of interference cancellation of the interference cancellation apparatus of FIG.

Referring to FIG. 12, assuming that the magnetic interference signal is in one quadrant of the complex plane, the vector modulator 1200 included in the interference canceling apparatus according to an embodiment may be configured as shown in FIG. Similarly, the magnetic interference cancellation signal can be generated and output as a combination of in-phase component I and quadrature component Q. Hereinafter, the vector modulator 1200 is described as being composed of passive elements of the step attenuator described above with reference to FIGS. 5 and 6, but is not limited thereto.

At this time, I ₁ and I ₂ are ideally canceled with each other because they are 180 degrees out of phase with each other. Thus, vector modulator 1200 includes a step attenuator corresponding to I = I ₁ + I ₂ is such that I ₁ and I ₂ the attenuation index and I ₂ of the step attenuator corresponding to attenuator index (I ₁ for each as shown in the right figure Attenuation index) can be selected. Here, if the index of I ₁ is increased or decreased, the size of the in-phase component is changed to be larger than the preset change value, while if the index of I ₂ is increased or decreased, the size of the in-phase component is changed to be smaller than the preset change value. do. Therefore, when only one of I ₁ and I ₂ is selected to form an in-phase component, it is impossible to finely control the size of the in-phase component. However, the vector modulator 1200 according to an embodiment increases or decreases the index of I ₁ to greatly change the size of the in-phase component, and then increases or decreases the index of I ₂ to slightly change the size of the in-phase component. In this way, it is possible to enable precise control of the size of the in-phase component. If the magnetic interference signal is in the second or third quadrant instead of the first quadrant, the roles of I ₁ and I ₂ may be changed. For example, when the magnetic interference signal is in the second or third quadrant, the vector modulator 1200 increases or decreases the index of I ₂ to greatly change the size of the in-phase component, and then increases or decreases the index of I ₁ . By minimizing the size of the in-phase component by reducing it, it is possible to enable precise control over the size of the in-phase component.

Similarly, Q ₁ and Q ₂ are ideally offset from each other because they are 180 ° out of phase with each other. Thus, vector modulator 1200 includes a step attenuator corresponding to Q = Q ₁ + Q ₂ to Q ₁ and Q ₂ attenuation index, and Q ₂ of the step attenuator corresponding to attenuator index (Q ₁ for each of the as shown in the right figure Attenuation index) can be selected. Here, if the index of Q ₁ is increased or decreased, the magnitude of the quadrature component is changed to be larger than the preset change value, while if the index of Q ₂ is increased or decreased, the size of the quadrature component is changed to be smaller than the preset change value. do. Therefore, when only one of Q ₁ and Q ₂ is selected to form a quadrature component, fine control of the size of the quadrature component is impossible. However, the vector modulator 1200 according to an embodiment increases or decreases the size of the quadrature component by increasing or decreasing the index of Q ₁ , and then finely changes the size of the quadrature component by increasing or decreasing the index of Q ₂ . By doing so, it is possible to enable precise control of the size of the quadrature component. If the magnetic interference signal is in the third or fourth quadrant instead of the first quadrant, the roles of Q ₁ and Q ₂ may be changed. For example, when the magnetic interference signal is in the third or fourth quadrant, the vector modulator 1200 increases or decreases the index of Q ₂ to change the magnitude of the quadrature component, and then increases or decreases the index of Q ₁ . By minimizing the size of the quadrature component by reducing it, it is possible to enable precise control of the size of the quadrature component.

FIG. 13 is a diagram illustrating an example for explaining an interference signal cancellation principle using an interference cancellation apparatus according to an embodiment.

Referring to FIG. 13, assuming that the magnetic interference signal is in a quadrant of the complex plane, the vector modulator included in the interference canceling apparatus according to an embodiment removes the magnetic interference as shown in the figure so that the magnitude and phase are similar to the magnetic interference signal. The signal can be generated and output in a combination of in-phase component I and quadrature component Q. Hereinafter, the vector modulator is described as being composed of passive elements of a 7 bit step attenuator having 7 bit 128 steps described above with reference to FIGS. 5 and 6, but is not limited thereto.

If, magnetic, and the size of the in-phase component 0.255 of an interference signal, assuming that the magnitude of the quadrature component of the magnetic interference 0.5, vector modulators by selecting 86 as the attenuation index value of I ₁ 0.307256 the size of I ₁ determined, and select 24 to attenuate the index value of I ₂ and it is possible to determine the size of the I ₂ to 0.051582 (the size corresponding to the index determined by the properties of the 7-bit step attenuator shown with reference to Figure 6 table) . Thus, as a result, the vector modulator can form an in-phase component having a magnitude of 0.25567 by the formula I = I ₁ + I ₂ (I ₁ and I ₂ are opposite signs from each other). The in-phase component having the magnitude of 0.25567 thus formed has only a very small error of 0.255 and 0.00067, which is the magnitude of the in-phase component of the magnetic interference signal. Similarly, vector modulators may select 107 the attenuation index value of Q ₁ by selecting 31 as the attenuation index value for determining a size of Q ₁ to 0.562341 and, Q ₂ to determine the amount of Q ₂ to 0.063096 (6 The size corresponding to the index is determined according to the characteristic table of the 7-bit step attenuator shown with reference). As a result, the vector modulator can form a quadrature component having a magnitude of 0.49924 by the formula Q = Q ₁ + Q ₂ (Q ₁ and Q ₂ are opposite signs from each other). The quadrature component having the size of 0.49924 thus formed has only a very small error of 0.5 and -0.00076, which are the magnitudes of the quadrature components of the magnetic interference signal.

As such, the vector modulator according to an embodiment utilizes all of I ₁ , I ₂ Q _1, and Q ₂ to roughly adjust the size of each of the in-phase component and the quadrature component, and then finely adjust the magnetic interference once more. It is possible to generate and output in-phase and quadrature components of the magnetic interference cancellation signal having a very high and accurate similarity with the in-phase and quadrature components of the signal.

14 is a flowchart illustrating an interference cancellation method according to an exemplary embodiment.

Referring to FIG. 14, an interference cancellation method according to an embodiment may be mainly performed by an interference cancellation device including at least one vector modulator and a transmission coupler included in a full-duplex wireless transmission / reception system using the interference cancellation device. .

In operation S1410, the transmission coupler may sample the analog transmission signal.

In step S1420, the at least one vector modulator, consisting of passive elements, changes the phase and magnitude of the analog transmission signal component from which the analog transmission signal is sampled, thereby eliminating magnetic interference signals caused by the analog transmission signal. Signals can be generated and output.

Specifically, in step S1420, the at least one vector modulator changes the phase and magnitude of the analog transmission signal component to form an in-phase component and a quadrature component with respect to the analog transmission signal component, and forms the in-phase component and the quadrature component. Can be combined to generate and output a magnetic interference cancellation signal. In this case, the process of changing the phase and the magnitude of the analog transmission signal component may be performed by passive elements included in at least one vector modulator, forming an in-phase component and a quadrature component for the analog transmission signal component. The combining and generating of the magnetic interference cancellation signal may be performed by at least one combiner included in the at least one vector modulator.

For example, in step S1420, the at least one vector modulator combines the signal component I _{1 with} phase 0 ° with respect to the analog transmission signal component and the signal component I ₂ with phase 180 ° with respect to the analog transmission signal component. A phase component is formed, and a quadrature component is formed by combining a signal component Q ₁ having a phase of 90 ° with respect to the analog transmission signal component and a signal component Q ₂ having a phase of 270 ° with respect to the analog transmission signal component, The components and quadrature components can be combined to generate and output a magnetic interference cancellation signal. More specifically, in step S1420, the at least one vector modulator adjusts the size of each of I ₁ and I ₂ and combines to determine the size of the in-phase component, and adjusts the size of each of Q ₁ and Q _2. Then, by combining and determining the magnitude of the quadrature component, it is possible to adaptively adjust the phase and magnitude of the magnetic interference cancellation signal. In particular, at least one vector modulator adjusts the size of each of I ₁ and I ₂ in order or in reverse order to roughly determine the size of the in-phase component and then finely determines the size of each of Q ₁ and Q ₂ in order. Or by adjusting in reverse order to roughly determine the size of the quadrature component can be determined in detail.

As described above, the interference cancellation method has been described as including two steps S1410 and S1420, but is not limited thereto and may include only step S1420 or additionally include other steps.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (15)

1. An interference cancellation apparatus used in a full duplex wireless transmission / reception system,

   Analog transmission signal in the full-duplex wireless transmission / reception system configured with passive elements changes the phase and magnitude of the sampled analog transmission signal component to generate a magnetic interference cancellation signal for removing the magnetic interference signal caused by the analog transmission signal. At least one vector modulator to output

   Interference cancellation device comprising a.
2. The method of claim 1,

   The at least one vector modulator,

   Phase and magnitude of the analog transmission signal component are changed to form an in-phase component and a quadrature component for the analog transmission signal component, and the in-phase component and the quadrature component are combined to And generate and output the magnetic interference cancellation signal.
3. The method of claim 2,

   The at least one vector modulator,

   Combining the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase of 180 ° with respect to the analog transmission signal component to form the in-phase component,

   And a signal component having a phase of 90 ° with respect to the analog transmission signal component and a signal component having a phase of 270 ° with respect to the analog transmission signal component to form the quadrature component.
4. The method of claim 3,

   The at least one vector modulator,

   The magnitude of the in-phase component is determined by combining magnitudes of the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase of 180 ° with respect to the analog transmission signal component and combining the same. Adjusting the magnitude of each of the signal component having a phase of 90 ° with respect to the transmission signal component and the signal component having a phase of 270 ° with respect to the analog transmission signal component and combining the same to determine the magnitude of the quadrature component.
5. The method of claim 4, wherein

   The at least one vector modulator,

   The magnitude of the in-phase component is approximately determined by adjusting the magnitude of each of the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase with 180 ° with respect to the analog transmission signal component in order or in reverse order. Then make some fine decisions

   The magnitude of the quadrature component is approximately determined by adjusting the magnitude of the signal component having a phase of 90 ° with respect to the analog transmission signal component and the signal component having a phase of 270 ° with respect to the analog transmission signal component in order or in reverse order. Finely determined behind, interference cancellation device.
6. The method of claim 1,

   At least one delayer for delaying the sampled analog transmission signal components

   Interference cancellation device further comprising.
7. The method of claim 6,

   The number of the at least one delay unit is provided in the interference cancellation device,

   And a self-interference signal by the analog transmission signal is determined according to the number of inflow paths introduced into the analog reception signal in the full-duplex wireless transmission / reception system.
8. The method of claim 6,

   When the plurality of at least one delay unit is provided, a divider for separating the plurality of analog transmission signal components sampled and transmitted to the plurality of delay units, the analog transmission signal

   Interference cancellation device further comprising.
9. The method of claim 1,

   The at least one vector modulator,

   The passive elements for changing the phase and magnitude of the analog transmission signal component; And

   At least one combiner for combining and combining output signal components output from the passive elements

   Interference cancellation device comprising a.
10. An RF transmitter for generating an analog transmission signal;

    A transmission coupler for sampling the analog transmission signal;

    An interference cancellation device for generating and outputting a magnetic interference cancellation signal for canceling the magnetic interference signal by the analog transmission signal;

    A reception coupler coupling the magnetic interference cancellation signal to an analog reception signal received from an antenna to remove components of the magnetic interference signal included in the analog reception signal; And

    An RF receiver for receiving an analog received signal from which the magnetic interference signal has been removed

    Including,

    The interference cancellation device,

    At least one vector modulator configured to generate and output the magnetic interference cancellation signal by varying the phase and magnitude of the analog transmission signal component sampled with the analog transmission signal while being comprised of passive elements

    Full duplex wireless transmission and reception system comprising a.
11. An interference cancellation method performed in a full duplex wireless system,

    Sampling an analog transmission signal at a transmission coupler included in the full duplex wireless system; And

    At least one vector modulator of the interference cancellation device included in the full-duplex wireless system, wherein the at least one vector modulator consists of passive elements, wherein the analog transmission signal changes the phase and magnitude of the sampled analog transmission signal component Generating and outputting a magnetic interference cancellation signal for canceling the magnetic interference signal by the analog transmission signal

    Interference cancellation method comprising a.
12. The method of claim 11,

    Generating and outputting the magnetic interference cancellation signal,

    Changing the phase and magnitude of the analog transmission signal component to form an in-phase component and a quadrature component for the analog transmission signal component; And

    Generating and outputting the magnetic interference cancellation signal by combining the in-phase component and the quadrature component

    Interference cancellation method comprising a.
13. The method of claim 12,

    Forming the in-phase component and quadrature component,

    Combining the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase of 180 ° with respect to the analog transmission signal component to form the in-phase component; And

    Combining the signal component having a phase of 90 ° with respect to the analog transmission signal component and the signal component having a phase of 270 ° with respect to the analog transmission signal component to form the quadrature component

    Interference cancellation method comprising a.
14. The method of claim 13,

    Forming the in-phase component,

    Determining the magnitude of the in-phase component by adjusting the magnitude of each of the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase of 180 ° with respect to the analog transmission signal component and combining the same;

    Including,

    Forming the quadrature component,

    Determining the magnitude of the quadrature component by adjusting the magnitude of each of the signal component having a phase of 90 ° with respect to the analog transmission signal component and the signal component having a phase of 270 ° with respect to the analog transmission signal component and combining the same;

    Interference cancellation method comprising a.
15. The method of claim 14,

    Determining the size of the in-phase component,

    The magnitude of the in-phase component is approximately determined by adjusting the magnitude of each of the signal component having a phase of 0 ° with respect to the analog transmission signal component and the signal component having a phase with 180 ° with respect to the analog transmission signal component in order or in reverse order. Detailed steps behind

    Including,

    Determining the size of the quadrature component,

    The magnitude of the quadrature component is approximately determined by adjusting the magnitude of the signal component having a phase of 90 ° with respect to the analog transmission signal component and the signal component having a phase of 270 ° with respect to the analog transmission signal component in order or in reverse order. Detailed steps behind

    Interference cancellation method comprising a.

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