KR101276740B1 - Apparatus for multi-input multi-output full-duplex wireless communication - Google Patents

Apparatus for multi-input multi-output full-duplex wireless communication Download PDF

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KR101276740B1
KR101276740B1 KR1020120019920A KR20120019920A KR101276740B1 KR 101276740 B1 KR101276740 B1 KR 101276740B1 KR 1020120019920 A KR1020120019920 A KR 1020120019920A KR 20120019920 A KR20120019920 A KR 20120019920A KR 101276740 B1 KR101276740 B1 KR 101276740B1
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signal
antenna
transmitting
wavelength
antenna pair
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KR1020120019920A
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Korean (ko)
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조준호
김보미
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포항공과대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-input / output duplex wireless communication device, comprising: a transmission antenna pair for transmitting the same signal having a wavelength? A receiving antenna provided on a line of position where each signal transmitted from the pair cancels each other, wherein each position of the transmitting antenna pair is two focal points used to define the position line; The line is defined as a position where the distance difference from the two focal points is an odd multiple of λ / 2, thereby eliminating magnetic interference at the electromagnetic wave level without increasing the distance between the transmitting antenna and the receiving antenna, It is possible to implement a multi-input / output full duplex wireless communication device having a plurality of transmit antenna pairs and a plurality of receive antennas. have.

Description

Apparatus for multi-input multi-output full-duplex wireless communication}

The present invention relates to a wireless communication apparatus and method, and more particularly, to a multi-input multi-output (MIMO) full-duplex mode wireless communication apparatus that eliminates magnetic interference.

Although Korea's wireless communication technology has been very limited until the 1980s, which is the analog generation, it has rapidly developed since the commercialization of CDMA mobile communication in the 1990s, and recently 4G LTE mobile communication technology has been commercialized. However, with the rapid development of mobile communication technology, the problem of frequency shortage is also emerging. In particular, the increased use of smart phones and tablet PCs is causing a much larger wireless data traffic problem than before. This problem will become more serious and the value of frequency resources will be greater.

Most communication systems in use today operate in half-duplex mode. The half duplex method requires an independent channel in time or frequency in order to transmit and receive signals at a transmitting end and a receiving end. However, in the corresponding full-duplex mode, the same channel is used at the transmitting end and the receiving end. That is, since the same frequency band is transmitted and received simultaneously, the full duplex method has better frequency efficiency than the half duplex method. Despite the disadvantage that the half duplex method has lower frequency efficiency than the full duplex method, the half duplex communication system is used because the magnetic interference problem caused by the full duplex operation causes difficulties in implementation. to be.

The problem of magnetic interference is caused by the signal sent from the transmitting end coming back to the receiving end because full duplex transmits and receives simultaneously using the same frequency band. In general, in a communication system, the strength of a transmission signal is greater than that of a reception signal. Therefore, a full duplex communication system having such a problem of magnetic interference cannot operate correctly.

However, in mobile communication systems where the value of frequency is increasingly important, the interest in the use of a full duplex communication system is increasing. In this situation, efficient and practical self-interference cancellation techniques are required to overcome and implement the shortcomings of full duplex communication systems.

An object of the present invention is to provide a wireless communication device of the dual input / output full duplex method to eliminate the magnetic interference.

Another object of the present invention is to provide a method for arranging a transmit / receive antenna of a dual wireless communication device before and after multiple inputs and outputs.

According to an aspect of the present invention, there is provided a wireless communication device of dual input / output dual type. The apparatus is provided at positions spaced apart from each other, each having a transmission antenna pair for transmitting the same signal having a wavelength λ, and a reception provided at a line of position where each signal transmitted from the transmission antenna pair cancels each other. An antenna, wherein each position of the transmit antenna pair is two focal points used to define the location line, wherein the location line is defined as a location where the distance difference from the two focal points is an odd multiple of λ / 2 It features.

According to another aspect of the present invention, there is provided a wireless communication device of a dual input and output full duplex. The apparatus comprises a first transmission antenna pair provided at positions spaced apart from each other, each transmitting a same first signal having a wavelength λ 1 , and a second transmitting antenna provided at positions spaced apart from each other and each transmitting a second signal having a wavelength λ 2 , respectively. The intersection of the two transmitting antenna pairs and the first position line from which the first signals transmitted from the first transmitting antenna pair cancel each other, and the second position line from which the second signals transmitted from the second transmitting antenna pair cancel each other. And a receiving antenna provided on the antenna, wherein each position of the first transmitting antenna pair is two first focal points used to define the first location line, and the first location line is from the two first focal points. Is defined as a position where the distance difference of is an odd multiple of λ 1/2 , each position of the second transmission antenna pair is two second focal points used to define the second position line, and the second position line is Two second focal points Distance from the difference between the is characterized in that which is defined by an odd multiple of λ 2/2 position.

According to still another aspect of the present invention, there is provided a method of arranging dual input / output dual radio communication device antennas. The method includes the distance the car placing the first transmit antenna pair having a wavelength of transmitting the same signal is λ 1, the two foci of the first hyperbola odd multiple of λ 1/2 from the two foci of the first hyperbola as cross and, further comprising distance difference from the two focus placing the second transmit antenna pair having a wavelength of transmitting the same signal is λ 2, the two foci of the second hyperbola odd multiple of λ 2/2, and the first hyperbolic and the Arranging the receiving antenna at the intersection of the second hyperbola.

The present invention eliminates interference signals at the electromagnetic wave level in a dual input / output dual duplex wireless communication device, thereby enabling full duplex wireless communication.

The present invention has high frequency efficiency by simultaneous transmission and reception and multiple input / output.

1 illustrates a full duplex wireless communication device.
2 illustrates an embodiment of a multi-input / output duplex wireless communication device according to the present invention.
3 is a diagram schematically illustrating an antenna basic arrangement including a power divider according to an embodiment of the present invention.
4 is a diagram illustrating arrangement of two transmission antenna pairs and a reception antenna of a multiple input / output full duplex wireless communication device according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an arrangement of three transmitting antenna pairs and a receiving antenna of a multi-input / output full duplex wireless communication device according to an embodiment of the present invention.
6 illustrates a method of arranging a transmission / reception antenna for a multi-input / output duplex communication device according to an embodiment of the present invention.

Hereinafter, some embodiments will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

1 illustrates a full duplex wireless communication device.

Referring to FIG. 1, the wireless communication apparatus 10 includes a reception antenna 100, a reception processing unit 110, an analog-digital converter (ADC) 120, a signal processing unit 130, and a digital-analog. A converter (Digital-Analog Converter, DAC) 140, a transmission processor 150, and a transmission antenna 160 are included.

The receiving antenna 100 receives a radio frequency signal. The reception processor 110 amplifies and filters the radio frequency signal received through the reception antenna 110 and down-converts the intermediate frequency signal. The ADC 120 samples the intermediate frequency signal down-converted by the reception processor 110 and converts the intermediate frequency signal into a digital intermediate frequency signal. The signal processor 130 processes the digital intermediate frequency signal according to the purpose. For example, the signal processor 130 demodulates and decodes the digital intermediate frequency signal to output the received information bits.

In addition, the signal processor 130 encodes and modulates the transmission information bit to generate a digital intermediate frequency signal, and transmits the digital intermediate frequency signal to the DAC 140. The DAC 140 converts the digital intermediate frequency signal generated by the signal processor 130 into an analog intermediate frequency signal. The transmission processor 150 up-converts the analog intermediate frequency signal converted by the DAC 140 into a radio frequency signal and performs filtering and amplification. The transmit antenna 160 transmits the upconverted radio frequency signal. At this time, the signal generated from the transmitting antenna 160 enters the receiving antenna 100 of the wireless communication device 10 as in the path (a). This signal is called a magnetic interference signal. In the case of the full duplex communication system, since the transmission and reception are simultaneously performed in the same frequency band, a magnetic interference problem in which the target signal is distorted by the magnetic interference signal occurs because the target signal and the magnetic interference signal are received together by the reception antenna 100. do. In order to implement a full duplex communication system, it is necessary to solve the magnetic interference problem.

2 illustrates an embodiment of a multi-input / output duplex wireless communication device according to the present invention.

Referring to FIG. 2, the wireless communication apparatus according to the present invention is a full duplex wireless communication apparatus, and includes transmission antenna pairs 260-1 and 260-2 and a reception antenna 200.

The transmitting antenna pairs 260-1 and 260-2 are composed of a first transmitting antenna 260-1 and a second transmitting antenna 260-2. The first transmitting antenna 260-1 and the second transmitting antenna 260-2 are provided at positions spaced apart from each other, and transmit the same signal having a wavelength λ, respectively. This is to cancel the two signals from each other at the location of the receiving antenna 200 of the same device.

The reception antenna 200 is provided on a line of position where the signals transmitted from the transmission antenna pairs 260-1 and 260-2 cancel each other. For example, the location line may have the form of a hyperbola as shown in FIG. 2.

The distance from the first transmission antenna 260-1 to an arbitrary point P is L1, and the distance from the second transmission antenna 260-2 to the point P is L2. At this time, since the signals transmitted from the first transmission antenna 260-1 and the second transmission antenna 260-2 are the same signals of wavelength lambda, the difference between the distance L1 and L2 becomes an odd multiple of lambda / 2. Offset each other at points.

Thus, the location line is an odd multiple of λ / 2, that is, the distance difference from the two foci

Figure 112012015989661-pat00001
where m is an integer. In this case, the position line is composed of a plurality of hyperbolas whose focal points are the positions of the first transmission antenna 260-1 and the second transmission antenna 260-2 according to the m value.

Due to the positions of the transmission antenna pairs 260-1 and 260-2 and the reception antenna 200 as described above, the magnetic interference signals generated from the transmission antenna pairs 260-1 and 260-2 are generated by the reception antenna 200. Offset in position. This suppresses the magnetic interference signal below the noise level, it is possible to effectively implement a full duplex communication system.

Although only one hyperbolic line is shown in FIG. 2, a plurality of position lines exist according to the m value.

In addition, although one receiving antenna 200 is illustrated in FIG. 2, this is only an example, and it is natural that a plurality of receiving antennas may be arranged on the position line as necessary.

In addition, the wireless communication apparatus according to the present invention distributes the same signal to the transmission antenna pairs 260-1 and 260-2, that is, the first transmission antenna 260-1 and the second transmission antenna 260-2. It may further include a power divider.

3 is a diagram schematically illustrating an antenna basic arrangement including a power divider according to an embodiment of the present invention.

Referring to FIG. 3, the transmission processor 350 transmits a signal having a wavelength λ to be transmitted to the power divider 370. The power divider 370 divides the signal into two identical signals and transmits them to the transmission antenna pairs 360-1 and 360-2, respectively.

The transmitting antenna pairs 360-1 and 360-2 transmit the same signals, respectively.

Figure 112012015989661-pat00002

Referring to Equation 1, L1 is the distance from the position of the first transmitting antenna 360-1 to the position of the receiving antenna 300, L2 is the receiving antenna 300 at the position of the second transmitting antenna 360-2. Indicates a wavelength of a signal transmitted from the first and second transmission antennas 360-1 and 360-2. As shown in Equation 1, since the receiving antenna 300 is provided at a position where the difference between L1 and L2 is an odd multiple of lambda / 2, the wavelength? The signals cancel each other out at the location of the receiving antenna 300.

This can be confirmed through the phase difference of the signal coming into the receiving antenna 300 from the transmission antenna pairs 360-1 and 360-2.

Figure 112012015989661-pat00003

As shown in Equation 2, when the difference between the distance L1 and the distance L2 becomes an odd multiple of λ / 2 (that is,

Figure 112012015989661-pat00004
Is a case where m = 0 or -1.) The transmission signal is canceled. Through this, the reception antenna 300 may receive the target signal to receive without interference of the transmission signal (magnetic interference signal). The receiving antenna 300 receives the object signal from which the interference signal has been removed and sends the received signal to the receiving processor 310.

The antenna arrangement shown in FIG. 3 can be expanded in two dimensions based on the hyperbolic nature that the difference in distances from the pair of focal points to any one point on the hyperbola is always constant. All points on the hyperbolic curve are arranged so that the difference in distance from the two foci of the hyperbola to an arbitrary point on the hyperbola is an odd multiple of the half wavelength of the signal to be transmitted and a pair of transmitting antennas are placed at the focal point of the hyperbolic curve. Is the point where the same signal from a pair of transmit antennas causes destructive interference. That is, every point on the hyperbola is a point at which the receiving antenna can operate in full duplex (see FIG. 2). Based on this, two or more hyperbolic lines that cross each other can be extended to devices having two or more transmission antenna pairs.

4 is a diagram illustrating arrangement of two transmission antenna pairs and a reception antenna of a multiple input / output full duplex wireless communication device according to an embodiment of the present invention.

Referring to FIG. 4, the radio communication apparatus according to the present invention includes a first transmission antenna pair 461-1 and 461-2 and a second transmission antenna pair 462-1 in a full duplex wireless communication apparatus. 462-2), and a reception antenna 400.

The first transmitting antenna pairs 461-1 and 461-2 are composed of the first-first transmitting antenna 461-1 and the first-second transmitting antenna 461-2. The first-first transmitting antenna 461-1 and the second-second transmitting antenna 461-2 are provided at positions spaced apart from each other, and transmit the same first signal having a wavelength λ 1 , respectively. This is to cancel the first signal at the position of the receiving antenna 400.

The second transmission antenna pairs 462-1 and 462-2 are composed of a 2-1 transmission antenna 462-1 and a 2-2 transmission antenna 462-2. The 2-1 transmitting antenna 462-1 and the 2-2 transmitting antenna 462-2 are provided at positions spaced apart from each other, and transmit the same second signal having a wavelength lambda 2 , respectively. This is to allow the second signal to be canceled at the position of the receiving antenna 400.

The radio communication apparatus according to the present invention distributes the same first signal having a wavelength λ 1 to the first- first transmission antenna 461-1 and the second-second transmission antenna 461-2, and transmits the second-first transmission. A power divider may be further included to distribute the same second signal having the wavelength λ 2 to the antenna 462-1 and the second - second transmitting antenna 462-2.

The receiving antenna 400 includes a first position line where the first signals transmitted from the first transmitting antenna pairs 461-1 and 461-2 cancel each other, and the second transmitting antenna pairs 462-1 and 462-2. The second signals transmitted from the?) Are provided on the intersections of the second position lines that cancel each other.

The first position line in which the first signal is canceled has the two first focusing points when the positions of the 1-1 transmitting antennas 461-1 and 1-2 transmitting antennas 461-2 are viewed as two first focal points. The distance difference from one focal point is an odd multiple of λ 1/2 , that is

Figure 112012015989661-pat00005
where m is an integer. The first-first transmitting antenna 461-1 and the first-second transmitting antenna 461-2 each transmit the same first signal, and the wavelength of each signal on the first position line is an odd multiple of lambda 1/2. The first signals cancel each other.

The second position line in which the second signal is canceled is determined when the positions of the 2-1 transmitting antenna 462-1 and the 1-2 transmitting antenna 462-2 are viewed as two second focal points. distance difference from the second focus that is an odd multiple of λ 2/2,

Figure 112012015989661-pat00006
where n is an integer. 2-1 transmission antennas (462-1) and the second-second transmit antenna (462-2) may each transmit the same second signal and, in the second position the line wavelength of the signals is an odd multiple of λ 2/2 The second signals cancel each other.

In this case, the first position line is composed of a plurality of hyperbolas having two foci as the first-first transmission antenna 461-1 and the second-second transmission antenna 461-2 according to the m value. The second position line is composed of a plurality of hyperbolas having two foci of the 2-1 transmitting antenna 462-1 and the 1-2 transmitting antenna 462-2 according to the value n.

The receiving antenna 400 is provided on the intersections P1 and P2 of the first location line and the second location line.

Although only one first location line and one second location line are illustrated in FIG. 4, a plurality of first location lines and second location lines exist according to the values of m and n. Therefore, although only two intersections P1 and P2 are illustrated in FIG. 4, more than one intersection exists, and a receiving antenna 400 may be provided at each position of the intersection. By providing the receiving antenna 400 at the plurality of intersections, it is possible to avoid the problem of magnetic interference from all the transmitting antennas 461-1, 461-2, 462-1, and 462-2.

FIG. 5 is a diagram illustrating an arrangement of three transmitting antenna pairs and a receiving antenna of a multi-input / output full duplex wireless communication device according to an embodiment of the present invention.

Referring to FIG. 5, as described above, when each position of the first transmission antenna pairs 561-1 and 561-2 is set to two first focal points, the first transmission antenna pairs 561-1 and 561-2 are described. The first position line at which the signal transmitted at) cancels is present at a position where the distance difference from the two first focal points is an odd multiple of lambda 1/2 . In addition, when the positions of the second transmission antenna pairs 562-1 and 562-2 are set to two second focal points, signals transmitted by the second transmission antenna pairs 562-1 and 562-2 are canceled. a second position line distance difference from the two second focal point exists in a position of an odd multiple of λ 2/2. The first position line and the second position line are composed of a plurality of hyperbolas according to the m and n values. When one of the plurality of hyperbolas constituting the first position line is a first hyperbola, and one of the plurality of hyperbolas constituting the second position line is a second hyperbola, the first hyperbola and the second hyperbola cross each other. There is an intersection. In this case, an arbitrary hyperbola passing through the intersection may be drawn, and third transmission antenna pairs 563-1 and 563-2 transmitting the same signal to each other may be positioned at two focal points of the arbitrary hyperbola. . In this case, three hyperbolic lines intersect at the intersection point. In this case, the distance difference from the third transmission antenna pair to the arbitrary hyperbola is an odd multiple of the half wavelength of the signal transmitted from the third transmission antenna pair, that is,

Figure 112012015989661-pat00007
When k is an integer, the magnetic interference signals of the third transmission antenna pair are canceled at the intersection point. That is, at the intersection point, the first transmission antenna pair 561-1 and 561-2, the second transmission antenna pair 562-1 and 562-2, and the third transmission antenna pair 563-1 and 563-2. ), All the signals transmitted by the signal are canceled. Therefore, by providing the reception antenna 500 at the intersection, it is possible to avoid the magnetic interference signals from all transmission antennas 561-1, 561-2, 562-1, 562-2, 563-1, and 563-2. .

Further, the third transmission antenna pairs 563-1 and 563-2 are two focal points, and the distance difference from the two focal points is different.

Figure 112012015989661-pat00008
There will be multiple hyperbolic phosphorus depending on the value of k. In this case, it is apparent that there may be a plurality of intersection points intersecting both the first position line and the second position line composed of a plurality of hyperbolas, and the receiving antenna 500 may be provided at the intersection point.

Further, there may be a plurality of arbitrary hyperbolas passing through the intersection of the first hyperbola and the second hyperbola, and in this case, the third transmit antenna pair may be a plurality of transmit antenna pairs. For example, a transmit antenna pair may be provided to transmit a signal having a wavelength of λ 3 at a focal point of one of a plurality of hyperbolas passing through an intersection of the first and second hyperbolas, and the first hyperbolic and the second A transmission antenna pair may be provided for transmitting a signal having a wavelength of λ 4 at a focal point of another hyperbola among a plurality of arbitrary hyperbolas passing through an intersection of two hyperbolas.

The present invention can eliminate the magnetic interference at the electromagnetic wave level without increasing the distance between the transmitting antenna and the receiving antenna through the arrangement of the antenna, multiple inputs and outputs having a plurality of transmit antenna pairs and a plurality of receive antennas Implementation of a full duplex wireless communication device is possible.

6 illustrates a method of arranging a transmission / reception antenna for a multi-input / output duplex communication device according to an embodiment of the present invention.

6, a multiple-input multiple-output I in the dual communication system antenna arrangement, the distance difference from the two focal first to a wavelength of transmitting the same signal is λ 1, the two foci of the first hyperbola an odd multiple of λ 1/2 A transmission antenna pair is arranged (S600).

The distance difference between placing the second transmit antenna pair having a wavelength of transmitting the same signal is λ 2, the two foci of the second hyperbola odd multiple of λ 2/2 from the first intersecting the first hyperbola, and two focus (S620) .

A reception antenna is disposed at an intersection point of the first hyperbola and the second hyperbola (S640).

In addition, a third transmission antenna pair may be further disposed at two focal points of any hyperbola passing through the intersection and having an odd multiple of the half-wavelength of the signal to be transmitted by the distance difference from the two focal points.

Through the arrangement of the antenna, it is possible to implement a multiple input / output full duplex wireless communication device capable of eliminating magnetic interference at the electromagnetic wave level.

The present invention may be applied to wireless communication systems such as cellular systems, relay systems, and apparatus and techniques related to various wireless networks.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (8)

In a full duplex wireless communication device,
A transmission antenna pair provided at positions spaced apart from each other and transmitting the same signal having a wavelength? And
And a receiving antenna provided on a line of position where signals transmitted from the transmitting antenna pair are canceled with each other.
Each position of the transmitting antenna pair is two focal points used to define the position line,
And the position line is defined as a position where a distance difference from the two focal points is an odd multiple of lambda / 2. The method of claim 1,
And a power divider for distributing the same signal having the wavelength λ to the transmission antenna pairs. In the dual communication input and output radio communication device,
A first transmitting antenna pair for transmitting the same first signal having a wavelength of λ 1 respectively;
A second transmission antenna pair for transmitting the same second signal having a wavelength of λ 2 , respectively; And
A reception antenna provided on an intersection of a first position line from which the first signals transmitted from the first transmission antenna pairs cancel each other, and a second position line from which the second signals transmitted from the second transmission antenna pairs cancel each other; Including,
Each position of the first transmission antenna pair is two first focal points used to define the first location line, and the first location line has an odd multiple of λ 1/2 of a distance difference from the two first focal points. Is defined as
The second angular position of the transmit antenna pair has the second position and the two second focal point are used to define a line, wherein the second position line is an odd multiple of the distance difference between λ 2/2 from the two second focal A dual input-output full duplex wireless communication device, characterized in that defined in position. The method of claim 3, wherein
And a power divider for distributing the same one signal having the wavelength lambda 1 to the first transmission antenna pair and distributing the same second signal having the wavelength lambda 2 to the second transmission antenna pair. Wireless communication device. The method of claim 3, wherein
And a third transmission antenna pair located on two focal points of any hyperbola passing through the intersection and transmitting the same signal to each other. 6. The method of claim 5,
And a distance difference from the third transmission antenna pair to the arbitrary hyperbola is an odd multiple of a half wavelength of a signal transmitted from the third transmission antenna pair. Multi-input / output dual radio communication antenna placement method,
The method comprising placing the distance difference between the first transmit antenna pair having a wavelength of λ 1 transmits the same signal in the two foci of the first hyperbola odd multiple of λ 1/2 from the two foci;
The method comprising placing the distance difference between the second transmit antenna pair for the transmit signal with the same wavelength λ 2 to the two foci of the second hyperbola odd multiple of λ 2/2 from the first hyperbolic and intersect, the two focus; And
And placing a receiving antenna at an intersection point of the first hyperbola and the second hyperbola. 8. The method of claim 7,
And further disposing a third transmit antenna pair that passes the intersection and transmits the same signal to each other at two focal points of any hyperbola, where the difference in distance from the two focal points is an odd multiple of the half wavelength of the signal to be transmitted. Placement method.
KR1020120019920A 2012-02-27 2012-02-27 Apparatus for multi-input multi-output full-duplex wireless communication KR101276740B1 (en)

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WO2015053528A1 (en) * 2013-10-07 2015-04-16 엘지전자 주식회사 Rotation pre-coder based self-interference cancellation method and apparatus in wireless access system supporting full duplex radio scheme
WO2015160009A1 (en) * 2014-04-17 2015-10-22 엘지전자 주식회사 Method and device for removing self-interference in wireless access system supporting full duplex radio scheme
EP3133739A1 (en) * 2014-07-15 2017-02-22 Huawei Technologies Co., Ltd. Signal recover method and signal transceiver device
CN109450572A (en) * 2018-10-30 2019-03-08 电子科技大学 The interference channel transmission strategy and power distribution method of transmitting terminal full duplex collaboration

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Publication number Priority date Publication date Assignee Title
JP2006166112A (en) 2004-12-08 2006-06-22 Nippon Telegr & Teleph Corp <Ntt> Weak radio communication system

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Publication number Priority date Publication date Assignee Title
JP2006166112A (en) 2004-12-08 2006-06-22 Nippon Telegr & Teleph Corp <Ntt> Weak radio communication system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015053528A1 (en) * 2013-10-07 2015-04-16 엘지전자 주식회사 Rotation pre-coder based self-interference cancellation method and apparatus in wireless access system supporting full duplex radio scheme
WO2015160009A1 (en) * 2014-04-17 2015-10-22 엘지전자 주식회사 Method and device for removing self-interference in wireless access system supporting full duplex radio scheme
US10374682B2 (en) 2014-04-17 2019-08-06 Lg Electronics Inc. Method and device for removing self-interference in wireless access system supporting full duplex radio scheme
EP3133739A1 (en) * 2014-07-15 2017-02-22 Huawei Technologies Co., Ltd. Signal recover method and signal transceiver device
EP3133739A4 (en) * 2014-07-15 2017-05-24 Huawei Technologies Co. Ltd. Signal recover method and signal transceiver device
CN109450572A (en) * 2018-10-30 2019-03-08 电子科技大学 The interference channel transmission strategy and power distribution method of transmitting terminal full duplex collaboration
CN109450572B (en) * 2018-10-30 2021-04-30 电子科技大学 Interference channel transmission strategy and power distribution method for full duplex cooperation of sending end

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