WO2019201055A1 - 全双工自干扰减弱方法及全双工自干扰减弱系统 - Google Patents

全双工自干扰减弱方法及全双工自干扰减弱系统 Download PDF

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Publication number
WO2019201055A1
WO2019201055A1 PCT/CN2019/079415 CN2019079415W WO2019201055A1 WO 2019201055 A1 WO2019201055 A1 WO 2019201055A1 CN 2019079415 W CN2019079415 W CN 2019079415W WO 2019201055 A1 WO2019201055 A1 WO 2019201055A1
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WO
WIPO (PCT)
Prior art keywords
port
dual
receiving antenna
signal
antenna
Prior art date
Application number
PCT/CN2019/079415
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English (en)
French (fr)
Inventor
黄晶晶
淦明
左鑫
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2019201055A1 publication Critical patent/WO2019201055A1/zh
Priority to US17/072,589 priority Critical patent/US11483121B2/en
Priority to US17/949,848 priority patent/US20230387950A1/en

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    • 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
    • H04L5/1461—Suppression of signals in the return path, i.e. bidirectional control circuits
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
    • H01Q9/0435—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave using two feed points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present application relates to the field of communications, and in particular, to a full-duplex self-interference attenuating method and a full-duplex self-interference attenuating system.
  • the communication field usually adopts Co-time Co-frequency Full Duplex (CCFD) technology to improve the utilization of wireless spectrum resources. rate.
  • CCFD Co-time Co-frequency Full Duplex
  • the CCFD mode improves the spectrum utilization by nearly double compared to the traditional Half Duplex (HD) mode (such as frequency division duplex mode, time division duplex mode).
  • the CCFD system generally consists of a receiver and a transmitter. Since the receiving antenna of the receiver is close to the transmitting antenna of the transmitter, the receiving antenna receives the signal transmitted by the transmitting antenna. Therefore, the signal transmitted by the transmitting antenna will seriously affect the receiving antenna.
  • the normal reception, the interference of the transmitting antenna to the receiving antenna in the CCFD system is called self-interference, and self-interference cancellation is a hot research problem to realize full-duplex technology.
  • the CCFD system includes two transmitting antennas and one receiving antenna, wherein the distance from one transmitting antenna to the receiving antenna is d, and the distance from the other transmitting antenna to the receiving antenna is d+n ⁇ /2, n
  • ⁇ is the wavelength.
  • the signals of the two transmitting antennas have a half-wavelength delay when they reach the receiving antenna, that is, the interference signals received by the receiving antennas from the two transmitting antennas are exactly ⁇ phase, so that the signals transmitted from the two transmitting antennas arrive.
  • the self-interference is significantly attenuated.
  • the above antenna interference cancellation method requires three antennas, and there is a high requirement for the position between the three antennas. Therefore, the above antenna interference cancellation method has a problem of an antenna number limitation and an antenna position limitation.
  • the embodiment of the present application provides a full-duplex self-interference attenuating method and a full-duplex self-interference attenuating system, which are used to solve the problem that the antenna number limitation and the antenna position limitation exist in the existing antenna interference cancellation method.
  • the embodiment of the present application provides a full-duplex self-interference attenuating method, which is applied to a full-duplex self-interference attenuating system, and the full-duplex self-interference attenuating system may include at least a dual-polarized receiving antenna and a transmitting antenna;
  • the full-duplex self-interference attenuation method includes:
  • a first port of the dual-polarized receiving antenna and a second port of the dual-polarized receiving antenna respectively receive signals transmitted by the transmitting antenna
  • the two ports of the dual-polarized receiving antenna in the full-duplex self-interference weakening system simultaneously receive the signal transmitted by the transmitting antenna, adjust at least one of the signals received by the two ports, and combine the two signals including the adjusted signal.
  • the full-duplex self-interference attenuating system using the embodiment of the present application reduces the number of antennas, reduces the cost, and no longer requires a space position between the transmitting antenna and the receiving antenna, thereby reducing the cost of the full-duplex system and solving the problem. Antenna position limitation problems in full-duplex systems.
  • the transmitting antenna and the bipolar receiving antenna are omnidirectional antennas, and have large signal coverage.
  • a first port of the dual-polarized receiving antenna has a first polarization direction
  • a second port of the dual-polarized receiving antenna has a second polarization direction
  • the transmitting antenna has a third polarization direction
  • the first polarization direction, the second polarization direction, and the third polarization direction are orthogonal to each other.
  • the first port and the second port of the dual-polarized receiving antenna have polarization directions orthogonal to the third polarization direction of the transmitting antenna, the first port and the second port of the dual-polarized receiving antenna are both The transmitting port of the transmitting antenna is isolated, so that the interference signals received by the first port and the second port of the dual-polarized receiving antenna are weakened, and the weakened interference signals received by the first port and the second port are adjusted and merged. , further reducing the interference of the transmitting antenna to the dual-polarized receiving antenna.
  • the polarization directions of the two ports of the dual-polarized receiving antenna are orthogonal to the polarization directions of the transmitting antenna, so that a signal with a larger amplitude is determined in the signals received by the two ports of the dual-polarized receiving antenna, thereby The amplitude attenuation and phase adjustment are performed on the signal with a large amplitude, and the signals are combined after the signal is adjusted, thereby realizing the self-interference weakening.
  • the adjustment of the adjustment circuit for adjusting the signals received by the two receiving ports of the dual-polarized receiving antenna simplifies the structure of the full-duplex self-interference weakening system.
  • the signal received by the first port of the dual-polarized receiving antenna and/or the signal received by the second port of the dual-polarized receiving antenna are adjusted.
  • Merger including:
  • the phases of the combined two signals are different by an odd multiple of 180 degrees; the amplitudes of the combined two signals are the same.
  • Self-interference cancellation can be achieved by adjusting the phase difference of the signals to be combined to an odd multiple of 180 degrees and the amplitude of the signals to be combined to be uniform.
  • the present application provides a full-duplex self-interference abatement system for performing the method in any of the above first aspect or any possible implementation of the first aspect, which has the same technical effect.
  • the system comprises a module or device for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.
  • the embodiment of the present application provides a full-duplex self-interference attenuating system, including: a transmitting antenna, a dual-polarized receiving antenna, a signal processor, and a combiner;
  • the transmitting antenna transmits a signal
  • the first port of the dual-polarization receiving antenna and the second port of the dual-polarization receiving antenna respectively receive signals transmitted by the transmitting antenna
  • the signal processor adjusts a signal received by the first port of the dual-polarized receiving antenna and/or a signal received by the second port of the dual-polarized receiving antenna;
  • the combiner combines two signals including the adjusted signal to attenuate interference of the transmit antenna with the dual polarized receive antenna.
  • the first port of the dual-polarized receiving antenna has a first polarization direction
  • the second port of the dual-polarization receiving antenna has a second polarization direction
  • the transmitting antenna has a third polarization direction
  • the first polarization direction, the second polarization direction, and the third polarization direction are orthogonal to each other.
  • the signal processor performs phase adjustment and amplitude adjustment on a signal received by the first port of the dual-polarized receiving antenna, and the combiner pairs the adjusted signal and the dual-polarized receiving antenna The signals received by the two ports are merged; or
  • the signal processor performs phase adjustment and amplitude adjustment on a signal received by the second port of the dual-polarized receiving antenna, and the combiner pairs the adjusted signal and the dual-polarized receiving antenna The signals received by one port are merged; or
  • the signal processor performs phase adjustment and amplitude adjustment on a signal received by a first port of the dual-polarized receiving antenna and a signal received by a second port of the dual-polarized receiving antenna, the combiner pair The adjusted signals are combined.
  • the phases of the combined two signals are different by an odd multiple of 180 degrees, and the amplitudes of the combined two signals are the same.
  • FIG. 1 shows a full-duplex self-interference attenuation system that may be applicable to an embodiment of the present application
  • FIG. 2 is a schematic flowchart diagram of a method for reducing full-duplex self-interference provided by Embodiment 1 of the present application;
  • FIG. 3 is a schematic diagram 1 showing the principle of the full-duplex self-interference attenuation method provided by the embodiment of the present application;
  • FIG. 4 is a schematic diagram 2 of the principle of the full-duplex self-interference attenuation method provided by the embodiment of the present application;
  • FIG. 5 is a schematic diagram 3 of the principle of the full-duplex self-interference attenuation method provided by the embodiment of the present application;
  • FIG. 6 is a schematic structural diagram of a full-duplex self-interference attenuating system provided in Embodiment 2 of the present application.
  • FIG. 1 illustrates a full-duplex self-interference abatement system that may be applicable to embodiments of the present application.
  • the full-duplex self-interference attenuating system provided in this embodiment includes at least a transmitting antenna, a dual-polarized receiving antenna, a signal processor, and a combiner.
  • the transmitting antenna sends a signal to the outside through the sending port 0.
  • the two receiving ports of the dual-polarized receiving antenna, as shown in FIG. 1 , the port 1 and the port 2 simultaneously receive the signal sent by the transmitting antenna through the port 0.
  • the ports respectively receive signals, and the signal processor adjusts at least one of the received signals of the two receiving ports, and the combiner combines the two signals including the adjusted signals to realize that the two receiving signals of the receiving antenna cancel each other out. Thereby the interference of the transmitting antenna to the dual-polarized receiving antenna is weakened.
  • FIG. 2 is a schematic flow chart of a method for reducing full-duplex self-interference provided by Embodiment 1 of the present application. The method can be applied to the full-duplex self-interference attenuation system described in FIG. As shown in Figure 2, the full-duplex self-interference reduction method includes:
  • the first port of the dual-polarized receiving antenna and the second port of the dual-polarized receiving antenna respectively receive signals transmitted by the transmitting antenna.
  • the full-duplex self-interference attenuating system in the embodiment of the present application uses a dual-polarized receiving antenna, and the dual-polarized receiving antenna has two polarization directions.
  • the dual-polarized receiving antenna includes the first.
  • the port (ie, port 1 in FIG. 1) and the second port (ie, port 2 in FIG. 1) each have a polarization direction, and the polarization direction is the direction of the electric field strength formed when the antenna radiates.
  • the dual-polarized receiving antenna in the same system when the transmitting antenna in the full-duplex self-interference weakening system sends a signal to the outside, the dual-polarized receiving antenna in the same system also receives the signal, which affects the normal signal receiving of the dual-polarized receiving antenna. Therefore, the transmitting antenna has interference to the dual-polarized receiving antenna.
  • the two ports of the dual-polarized receiving antenna have the same phase center, that is, the phase center of the receiving antenna, and thus the signals received by the two ports have the same phase.
  • the two ports since the two ports have different polarization directions, the strengths of the signals transmitted by the transmitting antennas may be different in different polarization directions, and thus the amplitudes of the signals received by the two ports may be different. Therefore, the two signals received by the two ports of the dual-polarized receiving antenna have the same phase and different amplitudes.
  • S202 Adjust and combine the signal received by the first port of the dual-polarized receiving antenna and/or the signal received by the second port of the dual-polarized receiving antenna to reduce interference of the transmitting antenna to the dual-polarized receiving antenna.
  • the first port and the second port of the dual-polarized receiving antenna simultaneously receive signals transmitted by the transmitting antenna, and two signals having different amplitudes can be obtained, so that the two signals can be mutually suppressed to achieve weak emission.
  • the purpose of the antenna to interfere with the dual-polarized receiving antenna.
  • At least one of the signals received by the first port and the second port may be adjusted, and after the adjustment, the amplitudes of the two signals to be combined are closer.
  • the signal transmitted by the transmitting antenna is a sine wave
  • the phase difference between the two signals to be combined after adjustment is also closer to 180 degrees.
  • only the signal received by the first port may be adjusted, and only the signal received by the second port may be adjusted, or the signals received by the two ports may be adjusted at the same time. After signal adjustment, the signals are combined to reduce self-interference.
  • the signal received by the first port is adjusted, the signal received by the second port is combined with the signal received by the adjusted first port.
  • the signal received by the first port and the signal received by the adjusted second port are combined.
  • the signals received by the first port and the second port are simultaneously adjusted, the adjusted first received signal and the adjusted second port received signal are combined.
  • two ports of the dual-polarized receiving antenna in the full-duplex self-interference weakening system simultaneously receive signals transmitted by the transmitting antenna, and the signals received by the two ports are received. At least one of the signals is adjusted and combined after the adjustment to achieve self-interference.
  • the two ports of the dual-polarized receiving antenna in the full-duplex self-interference weakening system simultaneously receive the signal transmitted by the transmitting antenna, adjust at least one of the signals received by the two ports, and combine the two signals including the adjusted signal.
  • the full-duplex self-interference attenuating system using the embodiment of the present application reduces the number of antennas, reduces the cost, and no longer requires a space position between the transmitting antenna and the receiving antenna, thereby reducing the cost of the full-duplex system and solving the problem. Antenna position limitation problems in full-duplex systems.
  • the transmitting antenna and the bipolar receiving antenna are omnidirectional antennas, and have large signal coverage.
  • the embodiment of the present application further provides a full-duplex self-interference weakening method.
  • the manner of signal adjustment is described in detail in this embodiment.
  • the signal received by the first port of the dual-polarized receiving antenna and/or the signal received by the second port of the dual-polarized receiving antenna are adjusted, and specifically includes: a dual-polarized receiving antenna
  • the signal received by one port and/or the signal received by the second port of the dual-polarized receiving antenna is phase and amplitude adjusted.
  • the signal received by the first port of the dual-polarized receiving antenna or the signal received by the second port of the dual-polarized receiving antenna is adjusted, specifically, the first port received by the dual-polarized receiving antenna is received.
  • the signal received by the second port of the signal or dual-polarized receive antenna is phase and amplitude adjusted.
  • the amplitude adjustment can be amplitude amplification and amplitude reduction, and the phase adjustment can move the phase forward or backward.
  • the signal received by the first port of the dual-polarized receiving antenna is amplitude-adjusted, and the signal received by the second port of the dual-polarized receiving antenna is phase-adjusted.
  • the amplitude adjustment can be amplitude amplification of a single signal, amplitude reduction of a single signal, amplitude amplification of two signals by different multiples, amplitude reduction of two signals by different multiples, and amplitude of two signals, one amplification, one reduction, phase adjustment
  • the phase of a single signal can move forward, the phase of a single signal moves backward, the phases of two signals move forward by different degrees, the phases of two signals move by different degrees, and the phases of two signals move in different directions.
  • the phase and amplitude adjustment are performed on the signal received by the first port of the dual-polarized receiving antenna and/or the signal received by the second port, so that the adjusted two signals have closer amplitude and phase difference. It is closer to 180 degrees, thus reducing self-interference when the two signals are combined.
  • the embodiment of the present application further provides a full-duplex self-interference attenuation method.
  • the first port of the dual-polarization receiving antenna is received.
  • the phases of the combined signals are 180 times different by an odd multiple; the amplitudes of the combined signals are the same, thereby realizing full-duplex self- Interference cancellation.
  • the adjusted signal received by the first port and the signal received by the second port are combined, and the adjusted The phase of the signal received by the first port and the signal received by the second port are an odd multiple of 180 degrees; the amplitude of the signal received by the adjusted first port and the signal received by the second port are the same.
  • the signal received by the adjusted second port is combined with the signal received by the first port, and the adjusted second port is The received signal and the phase of the signal received by the first port are an odd multiple of 180 degrees; the adjusted second port receives the same signal as the signal received by the first port.
  • the adjusted signal received by the first port of the dual-polarized receiving antenna and the signal received by the second port of the dual-polarized receiving antenna are adjusted, the adjusted signal received by the first port is adjusted and adjusted.
  • the signals received by the second port are combined, and the adjusted received signal of the first port and the phase of the received signal of the second port are 180 times different from each other; the adjusted first port receives the received signal.
  • the signal and the adjusted second port receive the same amplitude.
  • the amplitudes of the signals to be combined are adjusted to be the same, so that the two signals are combined and canceled each other, thereby achieving self-interference cancellation.
  • the embodiment of the present application further provides a full-duplex self-interference weakening method.
  • the first port of the dual-polarization receiving antenna has a first polarization direction
  • the second port of the dual-polarization receiving antenna has a second polarization direction
  • the transmitting antenna has a third polarization direction
  • the polarization direction, the second polarization direction, and the third polarization direction are orthogonal to each other, which further improves the self-interference attenuation effect.
  • the first port and the second port of the dual-polarized receiving antenna have polarization directions that are orthogonal to the third polarization direction of the transmitting antenna, and thus the first port and the second port of the dual-polarized receiving antenna
  • the interference between the first port and the second port of the dual-polarized receiving antenna is weakened, and the interference received by the first port and the second port is weakened in the embodiment of the present application.
  • the signals are adjusted and combined to further reduce the interference of the transmitting antenna to the dual-polarized receiving antenna.
  • the polarization directions of the two ports of the dual-polarized receiving antenna are orthogonal to the polarization directions of the transmitting antenna, so that a signal with a larger amplitude is determined in the signals received by the two ports of the dual-polarized receiving antenna, thereby The amplitude attenuation and phase adjustment are performed on the signal with a large amplitude, and the signals are combined after the signal is adjusted, thereby realizing the self-interference weakening.
  • the adjustment of the adjustment circuit for adjusting the signals received by the two receiving ports of the dual-polarized receiving antenna simplifies the structure of the full-duplex self-interference weakening system.
  • the polarization directions of the two ports of the dual-polarized receiving antenna and the polarization direction of the transmitting antenna are orthogonal to each other, so that it is convenient to determine a signal with a larger amplitude among the signals received by the two ports of the dual-polarized receiving antenna.
  • the phase center of the transmitting antenna is located in the Z-axis in the space rectangular coordinate system, and the phase center of the dual-polarized receiving antenna is located on the X-axis.
  • the direction vector of the transmitting antenna to the dual-polarized receiving antenna is recorded as the propagation direction of the signal transmitted by the transmitting antenna.
  • FIG. 3 shows a schematic diagram 1 of the full-duplex self-interference attenuating method provided by the embodiment of the present application.
  • the third polarization direction of the transmitting antenna is the Z axis in the space rectangular coordinate system
  • the first polarization direction of the first port of the dual polarized transmitting antenna is the X axis in the space rectangular coordinate system
  • the second polarization direction of the second port of the polarized transmit antenna is the Y-axis in the spatial Cartesian coordinate system.
  • the polarization direction of the first port of the dual-polarized receiving antenna (such as port 1 in FIG. 3) is polarized along the X-axis
  • the polarization direction of the second port of the dual-polarized receiving antenna (port 2 in FIG. 3) Polarized along the Y axis.
  • the angle between the propagation direction of the signal and the X-axis is recorded as the electric field at the dual-polarization receiving antenna excited by the transmitting antenna, and then there is also an angle between the electric field and the Z-axis.
  • the electric field can be decomposed into two components: a component along the X-axis direction and a component along the Z-axis.
  • the polarization direction corresponding to the port 2 is along the Y-axis direction
  • the polarization direction of the port 2 is orthogonal to the two components of the electric field
  • the polarization direction of the port 1 is along the X direction, so the pole of the port 1
  • the direction of the electric field is orthogonal to the component of the electric field along the Z-axis, parallel to the component of the electric field along the X-axis. Therefore, the strength of the signal received by port 1 is greater than the strength of the signal received by port 2; and because the phase centers of the two ports coincide, the phase of the signals received by the two ports can be considered to be the same.
  • the signal received by the port 1 is adjusted, and the adjusted signal is combined with the signal received by the port 2 to achieve the effect of self-interference reduction.
  • the phase and amplitude adjustment of the signal received by the port 1 may be performed. Specifically, the amplitude of the signal received by the first port is attenuated to be consistent with the amplitude of the signal received by the port 2, and the first port is received. The phase of the signal is adjusted to be 180 degrees out of phase with the signal received by port 2. At this time, the effect of self-interference cancellation can be achieved by combining the signal received by the adjusted port 1 with the signal received by the port 2.
  • FIG. 4 shows a schematic diagram 2 of the full-duplex self-interference attenuating method provided by the embodiment of the present application.
  • the third polarization direction of the transmitting antenna is the X axis in the space rectangular coordinate system
  • the first polarization direction of the first port of the dual polarization transmitting antenna is the Z axis in the space rectangular coordinate system
  • the second polarization direction of the second port of the polarized transmit antenna is the Y-axis in the spatial Cartesian coordinate system.
  • the polarization direction of the first port of the dual-polarized receiving antenna (such as port 1 in FIG. 4) is polarized along the Z-axis
  • the polarization direction of the second port of the dual-polarized receiving antenna (such as port 2 in FIG. 4) Polarized along the Y axis.
  • the angle between the propagation direction of the signal and the X-axis is recorded as the electric field at the dual-polarization receiving antenna excited by the transmitting antenna, and then there is also an angle between the electric field and the Z-axis.
  • the electric field can be decomposed into two components: a component along the X-axis direction and a component along the Z-axis.
  • the polarization direction corresponding to the port 2 is along the Y-axis direction
  • the polarization direction of the port 2 is orthogonal to the two components of the electric field
  • the polarization direction of the port 1 is along the Z direction, so the pole of the port 1
  • the direction is parallel to the component of the electric field along the Z-axis and orthogonal to the component of the electric field along the X-axis. Therefore, the strength of the signal received by port 1 is greater than the strength of the signal received by port 2; and because the phase centers of the two ports coincide, the phase of the signals received by the two ports can be considered to be the same.
  • the signal received by port 1 is adjusted, and the adjusted signal is combined with the signal received by port 2 to achieve the effect of self-interference reduction.
  • the phase and amplitude adjustment of the signal received by the port 1 may be performed. Specifically, the amplitude of the signal received by the first port is attenuated to be consistent with the amplitude of the signal received by the port 2, and the first port is received. The phase of the signal is adjusted to be 180 degrees out of phase with the signal received by port 2. At this time, the effect of self-interference cancellation can be achieved by combining the signal received by the adjusted first port with the signal received by the second port.
  • FIG. 5 shows a schematic diagram 3 of the full-duplex self-interference attenuating method provided by the embodiment of the present application.
  • the third polarization direction of the transmitting antenna is the Y-axis in the space rectangular coordinate system
  • the first polarization direction of the first port of the dual-polarized transmitting antenna is in the space rectangular coordinate system.
  • the X-axis, the second polarization direction of the second port of the dual-polarized transmit antenna is the Z-axis in the spatial Cartesian coordinate system.
  • the polarization direction of the first port of the dual-polarized receiving antenna (such as port 1 in FIG. 5) along the X-axis polarization of the second port of the dual-polarized receiving antenna (port 2 in FIG. 5) Z-axis polarization.
  • the electric field at the dual-polarized receiving antenna excited by the transmitting antenna is recorded as the direction of the electric field coincides with the Y-axis direction.
  • the polarization direction corresponding to the port 1 is along the Z direction
  • the polarization direction of the port 1 is orthogonal to the electric field
  • the polarization direction corresponding to the port 2 is along the X-axis direction, so the polarization direction and the electric field of the port 2 are also positive. Therefore, it can be considered that the strength of the signal received by port 1 is substantially the same as the strength of the signal received by port 2; and since the phase centers of the two ports coincide, the phases of the signals received by the two ports can be considered to be the same.
  • the amplitude of the signal received by port 1 or port 2 is adjusted, and the adjusted signal is combined with the unadjusted signal to achieve the effect of self-interference reduction.
  • the signal received by the port 1 or the port 2 can be phase-adjusted, for example, the phase of the signal received by the port 1 is adjusted to be 180 degrees out of phase with the signal received by the port 2. At this time, the effect of self-interference cancellation can be achieved by combining the adjusted signal with the signal received by port 2.
  • the polarization direction of the transmitting antenna in the full-duplex self-interference weakening system and the two polarization directions of the dual-polarized receiving antenna are orthogonal to each other, and the dual-polarized receiving antenna can be determined according to the polarization direction of the transmitting antenna.
  • the intensity of the signal received by the two receiving ports, and the attenuator is used to amplify the signal with high intensity, thereby avoiding the introduction of active devices in the full-duplex self-interference weakening system to perform amplitude on the less powerful signal.
  • the problem of introducing interference caused by amplification facilitates the solidification of the adjustment circuit for adjusting the signals received by the two receiving ports of the dual-polarized receiving antenna in the full-duplex self-interference reducing system, simplifying the full-duplex self-interference Reduce the structure of the system.
  • the full-duplex self-interference abatement system includes: a transmitting antenna, a dual-polarized receiving antenna, a signal processor, and a combiner;
  • the transmitting antenna transmits a signal
  • the first port of the dual-polarized receiving antenna and the second port of the dual-polarized receiving antenna respectively receive signals transmitted by the transmitting antenna
  • the signal processor adjusts the signal received by the first port of the dual-polarized receiving antenna and/or the signal received by the second port of the dual-polarized receiving antenna;
  • the combiner combines the two signals including the adjusted signal to attenuate the interference of the transmitting antenna to the dual-polarized receiving antenna.
  • the first port of the dual-polarized receiving antenna has a first polarization direction
  • the second port of the dual-polarized receiving antenna has a second polarization direction
  • the transmitting antenna has a third polarization direction
  • the first polarization direction The second polarization direction and the third polarization direction are orthogonal to each other.
  • the signal processor is specifically configured to perform phase and amplitude adjustment on a signal received by the first port of the dual-polarized receiving antenna and/or a signal received by the second port of the dual-polarized receiving antenna.
  • FIG. 1 exemplarily illustrates a case where a signal processor is used to adjust a signal received by a first port of a dual-polarized receiving antenna.
  • the signal processor can include an amplitude adjuster and a phase adjuster.
  • the phases of the combined signals are separated by an odd multiple of 180 degrees; the amplitudes of the combined signals are the same.
  • FIG. 6 is a schematic structural diagram of a full-duplex self-interference attenuating system provided in Embodiment 2 of the present application. As shown in FIG. 6, full-duplex self-interference is weakened.
  • the system includes: a transmit link, a receive link, and a self-interference cancellation circuit.
  • the transmitting link includes: a digital to analog converter, an up converter, a power amplifier, and a transmitting antenna.
  • the baseband digital signal Tb to be transmitted is first input to a digital-to-analog converter, which is sequentially transmitted through an up-converter, a power amplifier, and a transmitting antenna.
  • the receiving link includes: a dual-polarized receiving antenna, a signal processor, a combiner 1, a combiner 2, a low noise amplifier, a down converter, an analog to digital converter, and a combiner 3.
  • the receiving signal of the dual-polarized receiving antenna in the receiving link is received by the signal processor, the combiner 1, the low noise amplifier, the down converter and the analog-to-digital converter, and the received signal is weakened after self-interference.
  • Baseband digital signal Rb The self-interference cancellation circuit includes an antenna self-interference canceller, an analog self-interference canceller, and a digital self-interference canceller.
  • the antenna self-interference canceller comprises a transmitting antenna in the transmitting link, and a dual-polarized receiving antenna, a signal processor and a combiner 1 in the receiving link.
  • the analog self-interference canceller receives the signal output by the power amplifier and provides the signal to the combiner 2 after the analog self-interference cancellation.
  • the digital self-interference canceller receives the baseband digital signal and provides the digital self-interference canceled signal to the combiner 3.
  • the transmitting link receives the baseband digital signal Tb to be transmitted, and is converted into a baseband analog signal by a digital-to-analog converter.
  • the baseband analog signal passes through the upconverter and the power amplifier and becomes the RF signal TX to be transmitted, and the TX is transmitted through the transmitting antenna.
  • the dual-polarized receiving antenna receives the TX
  • the first port of the dual-polarized receiving antenna receives the first signal R1
  • the second port of the dual-polarized receiving antenna receives the second signal R2
  • the first signal R1 and the second signal R2 are passed through the signal processor and combiner 1 to obtain a radio frequency signal RX that eliminates self-interference of the antenna.
  • the analog self-interference canceller obtains the approximate signal Ra of the radio frequency signal RX based on the radio frequency signal TX, and the subtractor Ra is subtracted from the RX in the combiner 2 to realize the analog self-interference cancellation.
  • the RF signal RX which is simulated by self-interference cancellation, is converted into a signal Rc by a low noise amplifier, a down converter, and an analog to digital converter.
  • the digital self-interference canceller obtains the approximate signal Rd of the signal Rc based on the baseband digital signal Tb, and then subtracts Rd from the Rc in the combiner 3 to realize digital self-interference cancellation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • the above is only a specific embodiment of the present application. It is to be understood that those skilled in the art, in light of the specific embodiments provided herein, are susceptible to variations or substitutions.
  • the above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination.
  • the above-described embodiments may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that contains one or more sets of available media.
  • the usable medium can be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium.
  • the semiconductor medium can be a solid state drive (SSD).

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Abstract

本申请提供一种全双工自干扰减弱方法及全双工自干扰减弱系统。全双工自干扰减弱方法包括：双极化接收天线的第一端口和所述双极化接收天线的第二端口分别接收发射天线发送的信号；对所述双极化接收天线的第一端口接收到的信号和/或所述双极化接收天线的第二端口接收到的信号进行调整合并，以减弱所述发射天线对所述双极化接收天线的干扰。本申请提供的全双工自干扰减弱方法及全双工自干扰减弱系统解决了现有天线干扰消除方法中存在的天线数量限制和天线位置限制的问题。

Description

全双工自干扰减弱方法及全双工自干扰减弱系统
本申请要求于2018年04月19日提交中国专利局、申请号为201810356505.X、申请名称为“全双工自干扰减弱方法及全双工自干扰减弱系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种全双工自干扰减弱方法及全双工自干扰减弱系统。
背景技术
为缓解随着无线设备指数级的增加，无线频谱资源越来越稀缺的问题，通信领域通常采用同频全双工(Co-time Co-frequency Full Duplex，CCFD)技术以提高无线频谱资源的利用率。CCFD模式相比传统的半双工(Half Duplex，HD)模式(比如频分双工模式，时分双工模式)提高近一倍的频谱利用率。CCFD系统一般由接收机和发射机组成，由于接收机的接收天线与发射机的发射天线距离较近，接收天线会接收到发射天线发送的信号，因此，发射天线发送的信号将严重影响接收天线的正常接收，CCFD系统中发射天线对接收天线的干扰称为自干扰，自干扰消除是实现全双工技术的热门研究问题。
国内外业界对全双工自干扰消除技术进行了大量研究，自干扰消除技术包括天线干扰消除。天线干扰消除方法中CCFD系统包括两根发射天线和一根接收天线，其中一根发射天线到接收天线的距离是d，且另一根发射天线到接收天线的距离为d+nλ/2，n为奇数，λ为波长。这样使得使两根发射天线的信号到达接收天线时有半个波长的延迟，即接收天线接收到的来自两个发射天线的干扰信号恰好相差π相位，使得从两根发射天线发射出的信号到达接收天线时相互叠加抵消，因而自干扰会得到显著衰减。
但是上述天线干扰消除方法需要3根天线，且对3根天线之间的位置存在较高要求。因此，上述天线干扰消除方法存在天线数量限制和天线位置限制的问题。
发明内容
本申请实施例提供了一种全双工自干扰减弱方法及全双工自干扰减弱系统，用于解决现有天线干扰消除方法中存在天线数量限制和天线位置限制的问题。
第一方面，本申请实施例提供了一种全双工自干扰减弱方法，应用于全双工自干扰减弱系统中，全双工自干扰减弱系统至少可以包括双极化接收天线和发射天线；全双工自干扰减弱方法包括：
双极化接收天线的第一端口和所述双极化接收天线的第二端口分别接收发射天线发送的信号；
对所述双极化接收天线的第一端口接收到的信号和/或所述双极化接收天线的第二端 口接收到的信号进行调整合并，以减弱所述发射天线对所述双极化接收天线的干扰。
全双工自干扰减弱系统中的双极化接收天线的两个端口同时接收发射天线发送的信号，对两个端口接收到的信号中的至少一个信号进行调整，并合并包括调整后信号的两路信号，以减弱自干扰。使用本申请实施例的全双工自干扰减弱系统减少了天线数量，降低了成本且对发射天线和接收天线之间的空间位置不再有要求，从而降低了全双工系统的成本，解决了全双工系统中存在的天线位置限制问题。
同时，应用本申请实施例的全双工自干扰减弱系统中发射天线和双极向接收天线为全向天线，具有较大的信号覆盖范围。
在第一方面的第一种可能的实现方式中，所述双极化接收天线的第一端口具有第一极化方向，所述双极化接收天线的第二端口具有第二极化方向，所述发射天线具有第三极化方向，所述第一极化方向、所述第二极化方向、所述第三极化方向互相正交。
通过将双极化接收天线的第一端口和第二端口具有的极化方向均与发射天线具有的第三极化方向正交，使得双极化接收天线的第一端口和第二端口均与发射天线的发送端口存在隔离，进而使得双极化接收天线的第一端口和第二端口接收到的干扰信号减弱，对第一端口和第二端口接收到的减弱后的干扰信号进行调整与合并，进一步减弱了发射天线对双极化接收天线的干扰。同时，双极化接收天线的两个端口的极化方向与发射天线的极化方向相互正交，便于在双极化接收天线的两个端口接收到的信号中确定幅度较大的信号，从而对幅度较大的信号进行幅度衰减和相位调整，并在信号调整后进行信号合并，实现了自干扰减弱。通过确定幅度较大的信号，可避免在全双工自干扰减弱系统中引入有源器件对幅度较小的信号进行幅度放大而导致的引入干扰的问题，提高了自干扰减弱效果，同时方便了全双工自干扰减弱系统中，对双极化接收天线的两个接收端口接收到的信号进行调整的调整电路的固化，简化了全双工自干扰减弱系统结构。
在第一方面的第二种可能的实现方式中，对所述双极化接收天线的第一端口接收到的信号和/或所述双极化接收天线的第二端口接收到的信号进行调整合并，包括：
对所述双极化接收天线的第一端口接收到的信号进行相位调整和幅度调整，并对所述调整后的信号与所述双极化接收天线的第二端口接收到的信号进行合并；或
对所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，并对所述调整后的信号与所述双极化接收天线的第一端口接收到的信号进行合并；或
对所述双极化接收天线的第一端口接收到的信号和所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，并对调整后的信号进行合并。
结合上述第一方面的第二种可能的实现方式，在一种可能的实现方式中，进行合并的两路信号的相位相差180度的奇数倍；进行合并的两路信号的幅度相同。
通过将待合并的信号的相位差调整为180度的奇数倍以及待合并的信号的幅度调整为一致，可实现自干扰消除。
第二方面，本申请提供一种全双工自干扰减弱系统，该系统用于执行上述第一方面或第一方面的任意可能的实现方式中的方法，具有相同的技术效果。具体地，该系统包括用于执行上述第一方面或第一方面的任意可能的实现方式中的方法的模块或器件。
第二方面，本申请实施例提供了一种全双工自干扰减弱系统，包括：发射天线、双极化接收天线、信号处理器和合路器；其中，
所述发射天线发送信号；
所述双极化接收天线的第一端口和所述双极化接收天线的第二端口分别接收所述发射天线发送的信号；
所述信号处理器对所述双极化接收天线的第一端口接收到的信号和/或所述双极化接收天线的第二端口接收到的信号进行调整；
所述合路器合并包括调整后信号的两路信号，以减弱所述发射天线对所述双极化接收天线的干扰。
在第二方面的第一种可能的实现方式中，所述双极化接收天线的第一端口具有第一极化方向，所述双极化接收天线的第二端口具有第二极化方向，所述发射天线具有第三极化方向，所述第一极化方向、所述第二极化方向、所述第三极化方向互相正交。
在第二方面的第二种可能的实现方式中，，
所述信号处理器对所述双极化接收天线的第一端口接收到的信号进行相位调整和幅度调整，所述合路器对所述调整后的信号与所述双极化接收天线的第二端口接收到的信号进行合并；或
所述信号处理器对所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，所述合路器对所述调整后的信号与所述双极化接收天线的第一端口接收到的信号进行合并；或
所述信号处理器对所述双极化接收天线的第一端口接收到的信号和所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，所述合路器对调整后的信号进行合并。
结合上述第二方面的第二种可能的实现方式，在一种可能的实现方式中，进行合并的两路信号的相位相差180度的奇数倍，进行合并的两路信号的幅度相同。
本申请的在上述各方面提供的实现的基础上，还可以进行进一步组合以提供更多实现。
附图说明
图1示出了本申请实施例可能适用的一种全双工自干扰减弱系统；
图2示出了本申请实施例一提供的全双工自干扰减弱方法的流程示意图；
图3示出了本申请实施例提供的全双工自干扰减弱方法的原理示意图一；
图4示出了本申请实施例提供的全双工自干扰减弱方法的原理示意图二；
图5示出了本申请实施例提供的全双工自干扰减弱方法的原理示意图三；
图6示出了本申请实施例二提供的全双工自干扰减弱系统的结构示意图。
具体实施方式
下面结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
图1示出了本申请实施例可能适用的一种全双工自干扰减弱系统。如图1所示，本实施例提供的全双工自干扰减弱系统至少包括发射天线、双极化接收天线、信号处理器和合路器。发射天线通过发送端口0向外发送信号，双极化接收天线的两个接收端口，如图1中的端口1和端口2同时接收发射天线通过端口0发送的信号，本申请实施例两个接收端 口分别接收信号，信号处理器对两个接收端口接收到的信号中的至少一个接收信号进行调整，合路器合并包括调整后信号的两路信号以实现接收天线的两路接收信号相互抵消，从而减弱发射天线对双极化接收天线的干扰。
下面结合上述图1，介绍本申请实施例提供的全双工自干扰减弱方法。
图2示出了本申请实施例一提供的全双工自干扰减弱方法的流程示意图。该方法可以应用于图1所述的全双工自干扰减弱系统中。如图2所示，全双工自干扰减弱方法，包括：
S201、双极化接收天线的第一端口和双极化接收天线的第二端口分别接收发射天线发送的信号。
示例性的，本申请实施例中的全双工自干扰减弱系统采用双极化接收天线，双极化接收天线具有两个极化方向，如图1所示，双极化接收天线包括第一端口(即图1中的端口1)和第二端口(即图1中的端口2)，两个端口各自对应一个极化方向，极化方向为天线辐射时形成的电场强度的方向。
示例性的，在全双工自干扰减弱系统中的发射天线向外发送信号时，同一系统中的双极化接收天线也会接收到该信号，影响了双极化接收天线的正常信号接收，因此发射天线存在对双极化接收天线的干扰。
在具体的信号接收过程中，双极化接收天线的两个端口具有相同的相位中心，也即接收天线的相位中心，因而两个端口接收到的信号相位相同。但是，由于两个端口具有不同的极化方向，不同的极化方向上发射天线发送的信号的强度可能存在不同，因此两个端口接收到的信号的幅度可能不同。故双极化接收天线的两个端口接收到的两个信号存在相位一致，而幅度不同的情况。
S202、对双极化接收天线的第一端口接收到的信号和/或双极化接收天线的第二端口接收到的信号进行调整合并，以减弱发射天线对双极化接收天线的干扰。
示例性的，采用双极化接收天线的第一端口和第二端口同时接收发射天线发送的信号，可得到仅幅度不同的两路信号，因而可利用这两路信号进行相互抑制，实现减弱发射天线对双极化接收天线的干扰的目的。
具体的，为实现相互抑制，可对第一端口和第二端口接收到的信号中的至少一个信号进行调整，在调整后，待合并的两个信号的幅度更接近。同时，考虑到发射天线发送的信号为正弦波，调整后待合并的两个信号的相位差也更接近180度。此时，将待合并的两个信号合并即可减弱自干扰。
示例性的，可仅对第一端口接收到的信号进行调整，还可仅对第二端口接收到的信号进行调整，也可同时对两个端口接收到的信号进行调整。在进行信号调整后，合并信号以减弱自干扰。对应的，在仅对第一端口接收到的信号进行调整时，合并第二端口接收到的信号与调整后的第一端口接收到的信号。在仅对第二端口接收到的信号进行调整时，合并第一端口接收到的信号与调整后的第二端口接收到的信号。在同时对第一端口和第二端口接收到的信号进行调整时，合并调整后的第一接收到的信号和调整后的第二端口接收到的信号。
本申请实施例提供的全双工自干扰减弱方法中，全双工自干扰减弱系统中的双极化接收天线的两个端口同时接收发射天线发送的信号，对两个端口接收到的信号中的至少一个信号进行调整，并在调整后进行信号合并，以实现减弱自干扰。
全双工自干扰减弱系统中的双极化接收天线的两个端口同时接收发射天线发送的信号，对两个端口接收到的信号中的至少一个信号进行调整，并合并包括调整后信号的两路信号，以减弱自干扰。使用本申请实施例的全双工自干扰减弱系统减少了天线数量，降低了成本且对发射天线和接收天线之间的空间位置不再有要求，从而降低了全双工系统的成本，解决了全双工系统中存在的天线位置限制问题。
同时，应用本申请实施例的全双工自干扰减弱系统中发射天线和双极向接收天线为全向天线，具有较大的信号覆盖范围。
可选的，在上述实施例的基础上，本申请实施例还提供一种全双工自干扰减弱方法。本实施例中对信号调整的方式进行了详细说明。
本申请实施例中，对双极化接收天线的第一端口接收到的信号和/或双极化接收天线的第二端口接收到的信号进行调整，具体包括：对双极化接收天线的第一端口接收到的信号和/或双极化接收天线的第二端口接收到的信号进行相位和幅度调整。
其中，在对双极化接收天线的第一端口接收到的信号或双极化接收天线的第二端口接收到的信号进行调整时，具体包括对双极化接收天线的第一端口接收到的信号或双极化接收天线的第二端口接收到的信号进行相位和幅度调整。可选的，幅度调整可以为幅度放大和幅度缩小，相位调整可以为相位向前或向后移动。
其中，在对双极化接收天线的第一端口接收到的信号和双极化接收天线的第二端口接收到的信号进行调整时，包括如下中的至少一项：
对双极化接收天线的第一端口接收到的信号进行相位和幅度调整，对双极化接收天线的第二端口接收到的信号进行相位和幅度调整；或者；
对双极化接收天线的第一端口接收到的信号进行相位和幅度调整，对双极化接收天线的第二端口接收到的信号进行相位调整；或者；
对双极化接收天线的第一端口接收到的信号进行相位和幅度调整，对双极化接收天线的第二端口接收到的信号进行幅度调整；或者；
对双极化接收天线的第一端口接收到的信号进行相位调整，对双极化接收天线的第二端口接收到的信号进行相位和幅度调整；或者；
对双极化接收天线的第一端口接收到的信号进行相位调整，对双极化接收天线的第二端口接收到的信号进行幅度调整；或者；
对双极化接收天线的第一端口接收到的信号进行幅度调整，对双极化接收天线的第二端口接收到的信号进行相位和幅度调整；或者；
对双极化接收天线的第一端口接收到的信号进行幅度调整，对双极化接收天线的第二端口接收到的信号进行相位调整。
可选的，幅度调整可以为单个信号的幅度放大、单个信号的幅度缩小、两个信号的幅度放大不同倍数、两个信号的幅度缩小不同倍数以及两个信号的幅度一个放大一个缩小，相位调整可以为单个信号的相位向前移动、单个信号的相位向后移动、两个信号的相位向前移动不同度数、两个信号的相位移动不同度数以及两个信号的相位向不同方向移动。
本申请实施例中，对双极化接收天线的第一端口接收到的信号和/或第二端口接收到的信号进行相位与幅度调整，可使得调整后的两路信号幅度更接近、相位差更接近180度，从而在两路信号合并时减弱自干扰。
进一步的，在上述实施例的基础上，本申请实施例还提供一种全双工自干扰减弱方法，本实施例中为提高自干扰减弱效果，在对双极化接收天线的第一端口接收到的信号和/或双极化接收天线的第二端口接收到的信号进行调整之后，进行合并的信号的相位相差180度的奇数倍；进行合并的信号的幅度相同，从而实现全双工自干扰消除。
具体的，当对双极化接收天线的第一端口接收到的信号进行相位和幅度调整时，将调整后的第一端口接收到的信号和第二端口接收到的信号进行合并，调整后的第一端口接收到的信号和第二端口接收到的信号的相位相差180度的奇数倍；调整后的第一端口接收到的信号和第二端口接收到的信号的幅度相同。
当对双极化接收天线的第二端口接收到的信号进行相位和幅度调整时，将调整后的第二端口接收到的信号和第一端口接收到的信号进行合并，调整后的第二端口接收到的信号和第一端口接收到的信号的相位相差180度的奇数倍；调整后的第二端口接收到的信号和第一端口接收到的信号的幅度相同。
具体的，当对双极化接收天线的第一端口接收到的信号和双极化接收天线的第二端口接收到的信号进行调整时，将调整后的第一端口接收到的信号和调整后的第二端口接收到的信号进行合并，调整后的第一端口接收到的信号和调整后的第二端口接收到的信号的相位相差180度的奇数倍；调整后的第一端口接收到的信号和调整后的第二端口接收到的信号的幅度相同。
本申请实施例中，通过将待合并的信号的相位差调整至180度的奇数倍，将待合并的信号的幅度调整至相同，可使得两信号合并后相互抵消，从而实现自干扰消除。
进一步的，在上述任一实施例的基础上，本申请实施例还提供一种全双工自干扰减弱方法。本实施例中，双极化接收天线的第一端口具有第一极化方向，双极化接收天线的第二端口具有第二极化方向，发射天线具有第三极化方向；其中，第一极化方向、第二极化方向、第三极化方向互相正交，进一步提高了自干扰减弱效果。
示例性的，双极化接收天线的第一端口和第二端口具有的极化方向均与发射天线具有的第三极化方向正交，因而双极化接收天线的第一端口和第二端口均与发射天线的发送端口存在隔离，使得双极化接收天线的第一端口和第二端口接收到的干扰信号减弱，本申请实施例对第一端口和第二端口接收到的减弱后的干扰信号进行调整与合并，进一步减弱了发射天线对双极化接收天线的干扰。
同时，双极化接收天线的两个端口的极化方向与发射天线的极化方向相互正交，便于在双极化接收天线的两个端口接收到的信号中确定幅度较大的信号，从而对幅度较大的信号进行幅度衰减和相位调整，并在信号调整后进行信号合并，实现了自干扰减弱。通过确定幅度较大的信号，可避免在全双工自干扰减弱系统中引入有源器件对幅度较小的信号进行幅度放大而导致的引入干扰的问题，提高了自干扰减弱效果，同时方便了全双工自干扰减弱系统中，对双极化接收天线的两个接收端口接收到的信号进行调整的调整电路的固化，简化了全双工自干扰减弱系统结构。
下面对双极化接收天线的两个端口的极化方向与发射天线的极化方向相互正交，便于在双极化接收天线的两个端口接收到的信号中确定幅度较大的信号进行示例说明。
在全双工自干扰减弱系统实际使用过程中，假设发射天线的相位中心位于空间直角坐标系中的Z轴，双极化接收天线的相位中心位于X轴上。此时，发射天线到双极化接收天 线的方向向量记为，为发射天线发送的信号的传播方向。
例如，将发射天线的极化方向规定为Z轴时，图3示出了本申请实施例提供的全双工自干扰减弱方法的原理示意图一。如图3所示，发射天线的第三极化方向为空间直角坐标系中的Z轴，双极化发射天线的第一端口的第一极化方向为空间直角坐标系中的X轴，双极化发射天线的第二端口的第二极化方向为空间直角坐标系中的Y轴。双极化接收天线的第一端口(如图3中的端口1)的极化方向沿X轴极化，双极化接收天线的第二端口(如图3中的端口2)的极化方向沿Y轴极化。
此时，信号的传播方向与X轴的夹角记为，由发射天线激励起的在双极化接收天线处的电场记为，那么电场与Z轴之间也存在夹角。电场可以分解为两个分量：沿着X轴方向的分量和沿着Z轴的分量。
其中，由于端口2对应的极化方向沿Y轴方向，因此端口2的极化方向与电场的两个分量和都正交，而端口1对应的极化方向沿X方向，因此端口1的极化方向与电场的沿Z轴的分量正交，与电场的沿X轴的分量平行。因此端口1接收的信号的强度要大于端口2接收到的信号的强度；又由于两个端口的相位中心重合，可以认为两个端口接收到的信号的相位一致。
在这种情况下，对端口1接收到的信号进行调整，并将调整后的信号与端口2接收到的信号进行合并，即可实现自干扰减弱的效果。进一步的，可对端口1接收到的信号进行相位和幅度调整，具体的，将第一端口接收到的信号的幅度衰减为与端口2接收到的信号的幅度一致，并将第一端口接收到的信号的相位调整为与端口2接收到的信号的相位相差180度。此时，将调整后的端口1接收到的信号与端口2接收到的信号合并，即可实现自干扰消除的效果。
例如，将发射天线的极化方向规定为X轴时，图4示出了本申请实施例提供的全双工自干扰减弱方法的原理示意图二。如图4所示，发射天线的第三极化方向为空间直角坐标系中的X轴，双极化发射天线的第一端口的第一极化方向为空间直角坐标系中的Z轴，双极化发射天线的第二端口的第二极化方向为空间直角坐标系中的Y轴。双极化接收天线的第一端口(如图4中的端口1)的极化方向沿Z轴极化，双极化接收天线的第二端口(如图4中的端口2)的极化方向沿Y轴极化。
此时，信号的传播方向与X轴的夹角记为，由发射天线激励起的在双极化接收天线处的电场记为，那么电场与Z轴之间也存在夹角。电场可以分解为两个分量：沿着X轴方向的分量和沿着Z轴的分量。
其中，由于端口2对应的极化方向沿Y轴方向，因此端口2的极化方向与电场的两个分量和都正交，而端口1对应的极化方向沿Z方向，因此端口1的极化方向与电场的沿Z轴的分量平行，与电场的沿X轴的分量正交。因此端口1接收的信号的强度要大于端口2接收到的信号的强度；又由于两个端口的相位中心重合，可以认为两个端口接收到的信号的相位一致。
同样的，对端口1接收到的信号进行调整，并将调整后的信号与端口2接收到的信号进行合并，即可实现自干扰减弱的效果。进一步的，可对端口1接收到的信号进行相位和幅度调整，具体的，将第一端口接收到的信号的幅度衰减为与端口2接收到的信号的幅度一致，并将第一端口接收到的信号的相位调整为与端口2接收到的信号的相位相差180度。 此时，将调整后的第一端口接收到的信号与第二端口接收到的信号合并，即可实现自干扰消除的效果。
例如，将发射天线的极化方向规定为Y轴时，图5示出了本申请实施例提供的全双工自干扰减弱方法的原理示意图三。示例性的，如图5所示，发射天线的第三极化方向为空间直角坐标系中的Y轴，双极化发射天线的第一端口的第一极化方向为空间直角坐标系中的X轴，双极化发射天线的第二端口的第二极化方向为空间直角坐标系中的Z轴。双极化接收天线的第一端口(如图5中的端口1)的极化方向沿X轴极化双极化接收天线的第二端口(如图5中的端口2)的极化方向沿Z轴极化。
由发射天线激励起的在双极化接收天线处的电场记为，此时电场的方向与Y轴方向一致。
其中，由于端口1对应的极化方向沿Z方向，因此端口1的极化方向与电场正交，而端口2对应的极化方向沿X轴方向，因此端口2的极化方向与电场也正交，因此可以认为端口1接收的信号的强度和端口2接收到的信号的强度基本相同；又由于两个端口的相位中心重合，可以认为两个端口接收到的信号的相位一致。
此种情况下，对端口1或端口2接收到的信号进行幅度调整，并将调整后的信号与未调整的信号进行合并，即可实现自干扰减弱的效果。进一步的，可对端口1或端口2接收到的信号进行相位调整，例如，将端口1接收到的信号的相位调整为与端口2接收到的信号的相位相差180度。此时，将调整后的信号与端口2接收到的信号合并，即可实现自干扰消除的效果。
上述实施例中，全双工自干扰减弱系统中的发射天线的极化方向和双极化接收天线的两个极化方向相互正交，可根据发射天线的极化方向确定双极化接收天线的两个接收端口接收到的信号的强度，并采用衰减器对强度较大的信号进行幅度衰减，从而避免了在全双工自干扰减弱系统中引入有源器件对强度较小的信号进行幅度放大而导致的引入干扰的问题，方便了全双工自干扰减弱系统中，对双极化接收天线的两个接收端口接收到的信号进行调整的调整电路的固化，简化了全双工自干扰减弱系统结构。
本申请实施例另一方面还提供一种全双工自干扰减弱系统。如图1所示，全双工自干扰减弱系统包括：发射天线、双极化接收天线、信号处理器和合路器；其中，
所述发射天线发送信号；
双极化接收天线的第一端口和双极化接收天线的第二端口分别接收发射天线发送的信号；
信号处理器对双极化接收天线的第一端口接收到的信号和/或双极化接收天线的第二端口接收到的信号进行调整；
合路器合并包括调整后信号的两路信号，以减弱发射天线对双极化接收天线的干扰。
可选的，双极化接收天线的第一端口具有第一极化方向，双极化接收天线的第二端口具有第二极化方向，发射天线具有第三极化方向，第一极化方向、第二极化方向、第三极化方向互相正交。
可选的，信号处理器具体用于，对双极化接收天线的第一端口接收到的信号和/或双极化接收天线的第二端口接收到的信号进行相位和幅度调整。
示例性的，图1示例性的绘出了信号处理器用于对双极化接收天线的第一端口接收到的信号进行调整的情况。
可选的，信号处理器可以包括幅度调整器和相位调整器。
可选的，进行合并的信号的相位相差180度的奇数倍；进行合并的信号的幅度相同。
示例性的，在图1所示实施例的基础上，图6示出了本申请实施例二提供的全双工自干扰减弱系统的结构示意图，如图6所示，全双工自干扰减弱系统包括：发射链路，接收链路和自干扰消除电路。其中，发射链路包括：数模转换器、上变频器、功率放大器和发射天线。待发送的基带数字信号Tb首先输入数模转换器，依次经上变频器、功率放大器和发射天线发送出去。接收链路包括：双极化接收天线、信号处理器、合路器1、合路器2、低噪声放大器、下变频器、模数转换器和合路器3。接收链路中双极化接收天线接收到信号依次经信号处理器、合路器1、低噪声放大器、下变频器和模数转换器完成信号的接收过程，得到减弱了自干扰后的接收信号基带数字信号Rb。自干扰消除电路包括天线自干扰消除器、模拟自干扰消除器和数字自干扰消除器。其中，天线自干扰消除器包括发射链路中的发射天线，以及接收链路中的双极化接收天线、信号处理器和合路器1。模拟自干扰消除器接收功率放大器输出的信号，并向合路器2提供模拟自干扰消除后的信号。数字自干扰消除器接收基带数字信号，并向合路器3提供数字自干扰消除后的信号。
具体的，全双工自干扰减弱系统的工作过程如下：发射链路接收待发送的基带数字信号Tb，经过数模转换器变换为基带模拟信号。基带模拟信号经过上变频器和功率放大器，变为待发射的射频信号TX，TX通过发射天线被发射出去。发射天线在发送射频信号TX时，双极化接收天线接收TX，且双极化接收天线的第一端口接收到第一信号R1，双极化接收天线的第二端口接收到第二信号R2，第一信号R1和第二信号R2经信号处理器和合路器1之后得到消除了天线自干扰的射频信号RX。
模拟自干扰消除器基于射频信号TX获取射频信号RX的近似信号Ra，合路器2中将Ra从RX里面减去，实现了模拟自干扰消除。
经过模拟自干扰消除的射频信号RX，再经过低噪声放大器、下变频器和模数转换器变换为信号Rc。数字自干扰消除器基于基带数字信号Tb获取信号Rc的近似信号Rd，再在合路器3中将Rd从Rc里面减去，实现了数字自干扰消除。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。以上所述，仅为本申请的具体实施方式。熟悉本技术领域的技术人员根据本申请提供的具体实施方式，可想到变化或替换，都应涵盖在本申请的保护范围之内。
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”“第 四”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
上述实施例，可以全部或部分地通过软件、硬件、固件或其他任意组合来实现。当使用软件实现时，上述实施例可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载或执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集合的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质。半导体介质可以是固态硬盘(solid state drive，SSD)。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。

Claims (10)

  1. 一种全双工自干扰减弱方法，其特征在于，包括：
    双极化接收天线的第一端口和所述双极化接收天线的第二端口分别接收发射天线发送的信号；
    对所述双极化接收天线的第一端口接收到的信号和/或所述双极化接收天线的第二端口接收到的信号进行调整合并，以减弱所述发射天线对所述双极化接收天线的干扰。
  2. 根据权利要求1所述的方法，其特征在于，所述双极化接收天线的第一端口具有第一极化方向，所述双极化接收天线的第二端口具有第二极化方向，所述发射天线具有第三极化方向，所述第一极化方向、所述第二极化方向、所述第三极化方向互相正交。
  3. 根据权利要求1或2所述的方法，其特征在于，对所述双极化接收天线的第一端口接收到的信号和/或所述双极化接收天线的第二端口接收到的信号进行调整合并，包括：
    对所述双极化接收天线的第一端口接收到的信号进行相位调整和幅度调整，并对所述调整后的信号与所述双极化接收天线的第二端口接收到的信号进行合并；或
    对所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，并对所述调整后的信号与所述双极化接收天线的第一端口接收到的信号进行合并；或
    对所述双极化接收天线的第一端口接收到的信号和所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，并对调整后的信号进行合并。
  4. 根据权利要求3所述的方法，其特征在于，进行合并的两路信号的相位相差180度的奇数倍。
  5. 根据权利要求3或4所述的方法，其特征在于，进行合并的两路信号的幅度相同。
  6. 一种全双工自干扰减弱系统，其特征在于，包括：发射天线、双极化接收天线、信号处理器和合路器；其中，
    所述发射天线发送信号；
    所述双极化接收天线的第一端口和所述双极化接收天线的第二端口分别接收所述发射天线发送的信号；
    所述信号处理器对所述双极化接收天线的第一端口接收到的信号和/或所述双极化接收天线的第二端口接收到的信号进行调整；
    所述合路器合并包括调整后信号的两路信号，以减弱所述发射天线对所述双极化接收天线的干扰。
  7. 根据权利要求6所述的系统，其特征在于，所述双极化接收天线的第一端口具有第一极化方向，所述双极化接收天线的第二端口具有第二极化方向，所述发射天线具有第三极化方向，所述第一极化方向、所述第二极化方向、所述第三极化方向互相正交。
  8. 根据权利要求6或7所述的系统，其特征在于，所述信号处理器对所述双极化接收天线的第一端口接收到的信号进行相位调整和幅度调整，所述合路器对所述调整后的信号与所述双极化接收天线的第二端口接收到的信号进行合并；或
    所述信号处理器对所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，所述合路器对所述调整后的信号与所述双极化接收天线的第一端口接收到的信号进行合并；或
    所述信号处理器对所述双极化接收天线的第一端口接收到的信号和所述双极化接收天线的第二端口接收到的信号进行相位调整和幅度调整，所述合路器对调整后的信号进行合并。
  9. 根据权利要求8所述的系统，其特征在于，进行合并的两路信号的相位相差180度的奇数倍。
  10. 根据权利要求8或9所述的系统，其特征在于，进行合并的两路信号的幅度相同。
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