WO2020057281A1 - Procédé et dispositif d'élimination de signal d'auto-brouillage bilatéral simultané et à co-fréquence et support d'informations - Google Patents

Procédé et dispositif d'élimination de signal d'auto-brouillage bilatéral simultané et à co-fréquence et support d'informations Download PDF

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Publication number
WO2020057281A1
WO2020057281A1 PCT/CN2019/099507 CN2019099507W WO2020057281A1 WO 2020057281 A1 WO2020057281 A1 WO 2020057281A1 CN 2019099507 W CN2019099507 W CN 2019099507W WO 2020057281 A1 WO2020057281 A1 WO 2020057281A1
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Prior art keywords
signal
phase offset
function
target
amount
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PCT/CN2019/099507
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English (en)
Chinese (zh)
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秦宇
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西安中兴新软件有限责任公司
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    • 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
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • 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

Definitions

  • the present invention relates to information processing technology in the field of communications, and in particular, to a method, a device, and a storage medium for eliminating simultaneous full-frequency self-interference signals at the same frequency.
  • Simultaneous full-duplex at the same frequency refers to the two-way transmission of wireless transmitting and receiving signals in the same frequency band at the same time.
  • simultaneous full-duplex at the same time can greatly improve the efficiency of the wireless spectrum and improve the data transmission capacity of the wireless link.
  • Is an important development direction of wireless communication Is an important development direction of wireless communication.
  • the transmitted signals fall into the receiving channel through various channels and thus interfere with the received useful signals.
  • the self-interference signal cancellation for full-duplex at the same frequency is divided into three fields and stages, namely antenna cancellation, radio frequency cancellation, and digital cancellation.
  • the elimination of simultaneous co-frequency full-duplex self-interfering signals only stays at the conceptual level, and there is no operational implementation solution.
  • the embodiments of the present invention hope to provide a method, a device, and a storage medium for eliminating the same-frequency full-duplex self-interference signal, which can separate the self-interference signal in the received signal, thereby effectively separating the self-interference signal in the received signal.
  • the interference signal is eliminated to avoid the influence of the self-interference signal on the received signal.
  • a method for eliminating a self-interference signal at the same frequency and full duplex includes: acquiring a first signal; separating a second signal in the first signal from a first interference signal through an isolator, and removing the second signal from the first signal.
  • the second signal is obtained by screening from the first signal; or the second interference signal, the second signal, and the first interference signal in the first signal are separated by the isolator and the circulator, And obtaining the second signal by filtering from the first signal; obtaining a first intensity value of the second signal based on a preset first phase offset amount and a preset first attenuation amount;
  • the second signal is a received signal corresponding to the transmitted third signal; and based on the first intensity value of the second signal, adjusting the preset first phase offset and the preset first attenuation To obtain a second phase offset and a second attenuation; based on the second phase offset and the second attenuation, to obtain a second intensity value of the second signal; Two intensity values are less than a first preset threshold, based on the first
  • the two phase offset amounts and the second attenuation amount determine a target phase offset amount and a target attenuation amount; and based on the target phase offset amount and the target attenuation amount, the second signal
  • a simultaneous co-frequency full-duplex self-interference signal cancellation device includes: a processor, a memory, an isolator, and a communication bus; the communication bus is used to implement the processor, the memory, and the isolator A communication connection between them; the processor is configured to obtain a first signal; the processor is further configured to separate a second signal in the first signal from a first interference signal through the isolator, And filtering the second signal from the first signal; the device further includes a circulator, wherein: the processor is further configured to pass the first signal through the isolator and the circulator; The second interference signal, the second signal, and the first interference signal are separated, and the second signal is obtained by filtering from the first signal; and the processor is further configured to be based on a preset Obtaining a first intensity value of the second signal by a first phase offset amount and a preset first attenuation amount; wherein the second signal is a received signal corresponding to a transmitted third signal; based on the First intensity value of the second
  • a computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors, so as to achieve the above-mentioned simultaneous same-frequency full-frequency operation. Steps of the duplex self-interference signal cancellation method.
  • a computer program product includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions that, when executed by a computer, cause the computer to execute The methods described above.
  • FIG. 1 is a schematic flowchart of a method for removing a co-channel full-duplex self-interference signal provided by an embodiment of the present invention
  • FIG. 2 is a circuit block diagram of a device for separating transmitting and receiving antennas according to an embodiment of the present invention
  • FIG. 3 is a circuit block diagram of a device for transmitting and receiving a common antenna according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of another method for eliminating simultaneous full-frequency self-interference signals provided by an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a specific implementation process of a method for eliminating simultaneous co-channel full-duplex self-interference signals according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a specific implementation process of another method for eliminating simultaneous full-duplex self-interference signals provided by an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a simultaneous co-frequency full-duplex self-interference signal cancellation device according to an embodiment of the present invention.
  • An embodiment of the present invention provides a method for eliminating simultaneous self-interference signals at the same frequency and full duplex.
  • the method is applied to a device for eliminating simultaneous interference signals at the same frequency and full duplex. As shown in FIG. 1, the method includes the following steps:
  • Step 101 Obtain a first signal.
  • step 102 the second signal in the first signal is separated from the first interference signal by an isolator, and the second signal is obtained by screening from the first signal; or, the first signal in the first signal is separated by an isolator and a circulator.
  • An interference signal, a second interference signal and a second signal are separated, and a second signal is obtained by screening from the first signal.
  • the same-frequency full-duplex self-interference signal cancels the transmission signal of the device.
  • the first signal is a signal received by the device
  • the first interference signal is an interference signal generated by entering the transmission channel of the device
  • the second interference signal is Interference signals generated when the transmitted signal falls directly into the receiving channel of the device.
  • the embodiment of the present invention provides the following two implementation manners of filtering and obtaining the second signal from the first signal.
  • a second signal in a first signal and a first interference signal are separated by an isolator, and the first signal is filtered out.
  • the second signal is obtained for specific description. Please refer to FIG. 2.
  • the device includes:
  • Baseband and control unit 21 RF transmitting unit 22, first filter 23, RF power amplifier 24, directional coupler 25, isolator 26, transmitting antenna 27, adjustable phase shifter 28, adjustable attenuator 29, receiving antenna 30.
  • the combiner 31 the second filter 32, the low-noise amplifier 33, and the radio frequency receiving unit 34.
  • the baseband and control unit 21 controls the radio frequency transmission unit 22 to transmit signals.
  • the transmission signals are filtered by the first filter 23 and amplified by the radio frequency power amplifier 24, the transmission signals are separated into two transmission signals at the directional coupler 25, respectively. Is the first transmission signal and the second transmission signal.
  • the first transmitting signal is radiated into the space environment by the transmitting antenna 27 after being processed by the isolator 26.
  • the first signal is the total signal entering the transmitting antenna 27 and the receiving antenna 30;
  • the first interference signal is the first transmitting signal via The transmitting antenna 27 radiates to the space environment, and then obtains a transmission signal after transmission through atmospheric diffuse reflection and multipath effects.
  • the transmission signal after transmission is an interference signal generated by returning to the transmission channel of the device, and the first transmission signal is transmitting.
  • the end surface of the antenna 27 reflects an interference signal generated by entering the transmission channel of the device; the second signal is a signal entering the receiving antenna 30.
  • the first interference signal can be absorbed by the isolator 26, so the second signal in the first signal is separated from the first interference signal and a second signal is obtained.
  • the second transmission signal is processed by the adjustable phase shifter 28 and the adjustable attenuator 29, and the self-interference signal is eliminated in the combiner 31 with the second signal received by the receiving antenna 30; after the self-interference signal is eliminated,
  • the received signal is filtered by the second filter 32 and amplified by the low-noise amplifier 33, and then enters the radio frequency receiving unit 34.
  • the radio frequency receiving unit 34 returns the signal to the baseband and the control unit 21.
  • the control ports of the adjustable phase shifter 28 and the adjustable attenuator 29 are connected to the baseband and the control unit 21 to obtain the control signals output by the baseband and the control unit 21.
  • a first interference signal, a second interference signal and a second signal in the first signal are separated by an isolator and a circulator.
  • the second signal is selected from the first signal for specific description.
  • the device includes:
  • Baseband and control unit 21 RF transmitting unit 22, first filter 23, RF power amplifier 24, directional coupler 25, isolator 26, adjustable phase shifter 28, circulator 35, transmitting and receiving common antenna 36, adjustable attenuation
  • the baseband and control unit 21 controls the radio frequency transmission unit 22 to transmit signals.
  • the transmission signals are filtered by the first filter 23 and amplified by the radio frequency power amplifier 24, the transmission signals are separated into two transmission signals at the directional coupler 25, respectively. Is the first transmission signal and the second transmission signal.
  • the first transmission signal is processed by the isolator 26 and the circulator 35, it is radiated into the space environment by the transmitting and receiving common antenna 36; at this time, the first signal is the total signal entering the transmitting and receiving common antenna 36; the first interference signal is the first The transmission signal is radiated to the space environment through the transmitting and receiving common antenna 36, and then the transmission transmission signal is obtained through the atmospheric diffuse reflection and multipath effect.
  • the transmission signal after transmission is an interference signal generated by returning to the transmission channel of the device, and the first The transmitted signal is reflected on the end face of the transmitting and receiving common antenna 36 and is an interference signal generated by entering the transmission channel of the device; the second interference signal is an interference signal generated by falling directly into the receiving channel.
  • the first interference signal and the second interference signal can be absorbed by the circulator 35, and the remaining signal is the second signal.
  • the self-interference signal is eliminated in the combiner 31 with the second signal processed by the circulator 35; after the self-interference signal is eliminated,
  • the received signal obtained after filtering passes through the filtering of the second filter 32 and the amplification of the low-noise amplifier 33 and then enters the radio frequency receiving unit 34, and the radio frequency receiving unit 34 returns the signal to the baseband and the control unit 21.
  • the control ports of the adjustable phase shifter 28 and the adjustable attenuator 29 are connected to the baseband and the control unit 21 to obtain the control signals output by the baseband and the control unit 21.
  • Step 103 Obtain a first intensity value of the second signal based on a preset first phase offset and a preset first attenuation.
  • the second signal is a received signal corresponding to the transmitted third signal.
  • phase represents the initial position of the signal waveform at a specific moment
  • phase offset represents the offset of the signal waveform from the initial position
  • amplitude represents the peak of the signal waveform
  • attenuation represents the peak value of the signal after transmission. The amount of change.
  • the first phase offset amount and the first attenuation amount can be preset according to empirical values.
  • the preset first phase offset is -180 degrees
  • the preset first attenuation is 0 dB.
  • Step 104 Adjust a preset first phase offset amount and a preset first attenuation amount based on the first intensity value of the second signal to obtain a second phase offset amount and a second attenuation amount.
  • phase offsets and attenuations can be adjusted based on the received signal strength values to Obtain accurate self-interference signal cancellation parameters.
  • Step 105 Obtain a second intensity value of the second signal based on the second phase offset and the second attenuation.
  • the intensity value of the received signal at this time is obtained.
  • Step 106 if the second intensity value of the second signal is less than the first preset threshold, determine a target phase offset amount and a target attenuation amount based on the second phase offset amount and the second attenuation amount.
  • the first preset threshold may be any real number, which is not limited in the embodiment of the present invention.
  • the strength value of the received signal is less than a preset threshold, it indicates that the phase offset amount and the attenuation amount at this time have met the usage requirements.
  • the transmitted signals will enter the receiving channel after reflection at the antenna's radiating end face and generate interference signals; for devices with separate transmitting and receiving antennas, after the transmitted signals are radiated to free space, they will be transmitted and received and isolated. After attenuation, it will fall into the receiving antenna and enter the receiving channel, thereby generating an interference signal.
  • these two ways of transmitting signals into the receiving channel will attenuate the transmitted signal, the amplitude of the attenuated interference signal is still large compared to the amplitude of the received signal.
  • the interference signal generated by these two paths is determined by the hardware conditions of the device itself, that is, the channel characteristic parameters are determined. Therefore, before the device leaves the factory, the target phase offset amount and the target attenuation amount are determined through the above steps 101 to 106 to obtain parameters for radio frequency cancellation in an ideal environment, which can achieve cancellation of strong self-interference signals.
  • Step 107 Process the second signal based on the target phase offset and the target attenuation to obtain a target signal.
  • the method for eliminating simultaneous self-interference signals at the same frequency and full duplex obtained by the embodiment of the present invention obtains a first signal including a second signal and a first interference signal, and then uses an isolator to sum the second signal in the first signal and The first interference signal is separated, and the second signal is obtained by screening from the first signal; or, the first signal including the first interference signal, the second interference signal, and the second signal is obtained, and the first signal is separated by an isolator and a circulator.
  • the first interference signal, the second interference signal and the second signal in the signal are separated, and the second signal is filtered from the first signal; then, based on a preset first phase offset and a preset first attenuation To obtain the first intensity value of the second signal, and based on the first intensity value of the second signal, adjust a preset first phase offset amount and a preset first attenuation amount to obtain a second phase offset amount and A second attenuation amount; obtaining a second intensity value of the second signal based on the second phase offset amount and the second attenuation amount; if the second intensity value of the second signal is less than the first preset threshold value, based on the second phase offset Quantity and second Decrement determines the target phase offset and target attenuation; thus, based on the target phase offset and target attenuation, the second signal is processed to obtain the target signal.
  • the self-interference signal in the received signal can be separated, thereby The self-interference signal in the received signal is effectively eliminated, and the influence of the
  • an embodiment of the present invention provides another method for eliminating simultaneous full-frequency self-interference signals at the same frequency.
  • the method is applied to a device for eliminating simultaneous full-frequency self-interference signals at the same frequency. As shown in FIG. It includes the following steps:
  • Step 201 Obtain a first signal.
  • step 202 the second signal in the first signal is separated from the first interference signal by an isolator, and the second signal is obtained by screening from the first signal; or, the first signal in the first signal is separated by an isolator and a circulator.
  • An interference signal, a second interference signal and a second signal are separated, and a second signal is obtained by screening from the first signal.
  • Step 203 Obtain a first intensity value of the second signal based on a preset first phase offset and a preset first attenuation.
  • the second signal is a received signal corresponding to the transmitted third signal.
  • Step 204 Adjust a preset first phase offset amount and a preset first attenuation amount based on the first intensity value of the second signal to obtain a second phase offset amount and a second attenuation amount.
  • Step 205 Obtain a second intensity value of the second signal based on the second phase offset and the second attenuation.
  • Step 206 If the second intensity value of the second signal is less than the first preset threshold, determine the target phase offset amount and the target attenuation amount based on the second phase offset amount and the second attenuation amount.
  • the first preset threshold may be any real number, which is not limited in the embodiment of the present invention.
  • Step 207 Process the second signal to obtain a target signal based on the target phase offset and the target attenuation.
  • the target signal can be obtained by processing the second signal based on the target phase offset amount and the target attenuation amount in the following manner:
  • the third interference signal in the second signal is superimposed to obtain the target signal.
  • processing the transmission signal according to the target phase offset and the target attenuation, and superimposing the processed transmission signal with the second signal can eliminate the third interference signal that enters the receiving channel after being reflected by the antenna radiation end surface. Thereby, a target signal is obtained.
  • the method may further perform the following steps:
  • Step 208 If the second intensity value of the second signal is greater than or equal to the first preset threshold, adjust the second phase offset amount and the second attenuation amount based on the second intensity value of the second signal to obtain a third phase offset amount. And the third attenuation.
  • Step 209 If the third intensity value of the second signal corresponding to the third phase offset and the third attenuation is greater than or equal to the first preset threshold, adjust the third phase offset and the third attenuation, until after the adjustment The intensity value of the second signal corresponding to the phase shift amount and the adjusted attenuation amount is less than the first preset threshold.
  • phase offsets and attenuations can be adjusted based on the received signal strength values to Obtain accurate self-interference signal cancellation parameters.
  • the simultaneous co-frequency full-duplex self-interference signal cancellation method provided by the embodiment of the present invention can separate the self-interference signals in the received signal, thereby effectively eliminating the self-interference signals in the received signal, and avoid self-interference signals from receiving The effect of the signal.
  • the target phase offset is determined based on the second phase offset and the second attenuation.
  • target attenuation can also be achieved by the following steps:
  • the self-interference signal cancellation device obtains the first power value of the second signal based on the second phase offset and the second attenuation amount.
  • the self-interference signal should not be detected in the receiving channel. That is, in order to adjust the phase offset and attenuation more accurately, the power value of the second signal in the receiving channel can be detected.
  • the self-interference signal cancellation device determines a target phase offset amount and a target attenuation amount based on the second phase offset amount and the second attenuation amount.
  • the second preset threshold may be any real number, which is not limited in the embodiment of the present invention.
  • phase offsets and attenuations can be adjusted based on the power values of the received signals. To obtain accurate self-interference signal cancellation parameters.
  • Step 301 Place in a microwave dark room.
  • the user places the device in a microwave darkroom. Because the microwave darkroom refers to an environment where most electromagnetic waves are absorbed, with little transmission and reflection, when the electromagnetic waves are incident on walls, ceilings, and the ground. When testing the equipment in a microwave dark room, only the signals emitted by the equipment can eliminate the interference of external electromagnetic waves.
  • Step 302 Obtain a first phase offset.
  • the user presets the first phase offset of the adjustable phase shifter in the device to -180 degrees.
  • the adjustable phase shifter can adjust the phase offset of the signal waveform.
  • the preset first phase offset is -180 degrees, which enables the adjustable phase shifter to find the target phase offset more quickly.
  • Step 303 Obtain a first attenuation amount.
  • the user presets the first attenuation amount of the adjustable attenuator in the device to 0 dB.
  • the adjustable attenuator can adjust the attenuation amount of the signal waveform amplitude.
  • the preset first attenuation amount is 0 dB, which enables the adjustable attenuator to find the target attenuation amount more quickly.
  • Step 304 Transmit a signal.
  • the device After the device obtains the preset first phase offset amount and the preset first attenuation amount, the device starts transmitting a third signal.
  • Step 305 Detect the strength of the received signal.
  • the device detects a first strength value of the received second signal.
  • the second signal is a signal received for the transmitted third signal.
  • RSSI Received Signal Strength Indicator
  • step 306 it is determined whether the strength value of the received signal is less than a preset threshold. If yes, step 311 is performed; otherwise, step 307 is performed.
  • Step 307 Adjust the preset first attenuation amount.
  • the device fixes the first phase offset and continuously adjusts the attenuation of the adjustable attenuator in the device.
  • the strength of the received signal indicates that the RSSI value is greater than or equal to a preset threshold, it indicates that the phase offset and attenuation do not meet the requirements. At this time, you can continuously adjust the adjustable attenuator in the device by changing the value of the fixed phase offset to make the attenuation amount change.
  • Step 308 Obtain a second attenuation amount.
  • the RSSI value of the strength of the received signal will also change. By detecting that the RSSI value is less than a preset threshold, the attenuation amount that meets the requirements at this time can be obtained.
  • Step 309 Adjust a preset first phase offset.
  • the device fixes the value of the second attenuation amount and continuously adjusts the phase shift amount of the adjustable phase shifter so that the phase shift amount changes.
  • Step 310 Obtain a second phase offset.
  • the RSSI value of the strength of the received signal will change as the phase offset changes. By detecting that the RSSI value is less than a preset threshold, a phase offset that meets the requirements at this time can be obtained.
  • Step 311 Detect a power value of the received signal.
  • the device can detect the reference signal received power (Reference Living Power, RSRP) through a module that receives a useful signal. ).
  • RSRP Reference Living Power
  • step 312 it is determined whether the power value of the received signal is less than a preset threshold. If yes, step 317 is performed; otherwise, step 313 is performed.
  • the device determines whether the RSRP value of the reference signal received power is less than a preset threshold.
  • Step 313 Fine-tune the attenuation amount up and down.
  • the second phase offset and the second attenuation have been obtained by detecting the RSSI value, in order to better eliminate the self-interference signal, it is necessary to further detect the RSRP value to obtain the target phase offset. And target attenuation. At this time, it is only necessary to use the obtained second attenuation amount as a starting point, fine-tune the attenuation value up and down, and detect the corresponding RSRP value.
  • Step 314 Obtain a target attenuation amount.
  • the device can obtain the target attenuation amount that meets the requirements at this time.
  • Step 315 Fine-tune the phase offset from left to right.
  • the device uses the obtained second phase offset as a starting point, fine-tunes the value of the phase offset from left to right, and detects the corresponding RSRP value.
  • Step 316 Obtain a target phase offset.
  • the device can obtain a target phase offset that meets the requirements at this time.
  • step 317 the target attenuation amount and the target phase offset amount are stored in a memory.
  • the device stores the target attenuation and the target phase offset in the memory to process the transmitted signal, thereby eliminating the self-interference signal.
  • the simultaneous co-frequency full-duplex self-interference signal cancellation method provided by the embodiment of the present invention can separate the self-interference signals in the received signal, thereby effectively eliminating the self-interference signals in the received signal, and avoid self-interference signals from receiving The effect of the signal.
  • the above step 207 performs superposition processing on the third interference signal in the second signal to obtain the target signal based on the target phase offset amount and the target attenuation amount.
  • the following steps may also be performed: achieve:
  • the second signal function represents the second signal
  • the third signal function represents the third signal.
  • the transmission cancellation function is used to superimpose and cancel the interference signal generated by falling back to the receiving channel of the device itself.
  • obtaining the emission cancellation function based on the second signal function and the third signal function can be implemented in the following ways:
  • the first transmission function represents a change of the third signal after the transmission process.
  • the fourth interference signal is an interference signal generated after the transmitted signal is radiated into the space environment through the terminal antenna, after diffuse reflection in the atmosphere and multipath effect, and then falls back to the terminal antenna into its own receiving channel.
  • the fourth interference signal is characterized by a small amplitude, but the signal changes are complex and time-varying.
  • the third signal function and the first transmission function are operated to obtain the first emission cancellation function, which may be implemented in the following manner:
  • the verification signal is a received signal corresponding to the transmitted fourth signal.
  • the fourth signal is a signal retransmitted by the device and used to verify whether the first transmission function is correct. Matching degree is used to characterize the similarity of two signal waveforms.
  • the fifth signal is a received signal corresponding to the transmitted sixth signal.
  • the first matching degree is greater than or equal to the third preset threshold, it means that the transmission function is wrong and needs to be obtained again.
  • Step 401 Connect to the network.
  • the device is connected to the network for communication with other devices.
  • Step 402 Accept the demand for full-duplex transmission at the same frequency.
  • Step 403 Enter a transmission fallback channel detection time slot.
  • the device enters the transmission fallback channel detection time slot to obtain a transmission cancellation signal.
  • Step 404 The base station is notified to turn off the transmission signal and enter the monitoring state.
  • the device does not receive signals transmitted by the base station.
  • Step 405 Radio frequency elimination on-site calibration.
  • the device's antenna performance will be greater. Variety.
  • the RF offset parameters in the ideal environment that are pre-tested and stored before leaving the factory are significantly different from the parameters required in the actual network. If digital elimination is performed directly, it will complicate it. In severe cases, digital elimination may not work properly. Therefore, in the transmission fallback channel detection time slot, before the digital cancellation starts, the device performs a self-calibration of the RF cancellation again.
  • the parameters of radio frequency elimination are calibrated twice, once is factory calibration, which obtains fixed parameters determined by the device's own hardware conditions; once is field calibration, which obtains the deviation of the device in the field application due to environmental factors
  • the parameters need to be modified.
  • the process of factory calibration and field calibration is basically the same.
  • the initial state of the field calibration uses the output parameters of the factory calibration, that is, the field calibration is performed on the basis of the factory calibration, which can shorten the field calibration time and ensure the digital Elimination effectiveness.
  • Step 406 Enter the digital elimination process.
  • digital cancellation is to eliminate the interference signal generated by the transmitted signal radiated into the space environment through the device antenna, and after the atmospheric diffuse reflection and multipath effect, then fall back to the device antenna into its own receiving channel.
  • Step 407 Transmit a signal.
  • the device transmits a third signal.
  • Step 408 The received signal is demodulated.
  • the device demodulates the received second signal.
  • Step 409 Obtain a transfer function.
  • the device performs an operation on the second signal function obtained after demodulation and the third signal function transmitted to obtain a first transmission function, that is, a transmission function of the falling channel.
  • a transmission function of the fallback channel characterizes the change of the signal during transmission.
  • Step 410 Obtain a transmission cancellation function.
  • the device performs an operation on the transmitted third signal function and the first transmission function to obtain a first transmission cancellation function.
  • step 411 a verification signal is transmitted.
  • the device transmits a fourth signal at this time.
  • Step 412 The received verification signal is demodulated.
  • the device demodulates the received verification signal.
  • the verification signal is a received signal corresponding to the transmitted fourth signal.
  • Step 413 Verify.
  • the device compares the demodulated verification signal function with the second transmission cancellation function. Specifically, the fourth signal function and the transmission function of the falling channel are operated to obtain a second transmission cancellation function. If the transmission function of the fallback channel is error-free, the demodulated verification signal function and the second transmission cancellation function should be consistent.
  • step 414 it is determined whether the matching degree is less than a preset threshold. If so, step 415 is performed; if not, step 406 is performed.
  • the matching degree represents the similarity of the two signal waveforms.
  • Step 415 Exit the transmission fallback channel detection time slot.
  • Step 416 The base station is notified to enable the simultaneous full-frequency full-duplex transmission function.
  • the device after the device exits the transmission fallback channel detection slot, it can communicate with the base station normally.
  • Step 417 Obtain a received signal from the base station.
  • the device subtracts the transmitted cancellation sequence from the received mixed signal sequence to obtain the received signal sequence from the base station. Because the transmitted signal is radiated into the space environment through the antenna of the device, the transmitted signal after transmission through atmospheric diffuse reflection and multipath effect is the same as the emission cancellation sequence; the transmitted signal after transmission will be mixed into the signal received by the device, thus Generate interfering signals. Therefore, the received signal sequence from the base station can be obtained by subtracting the transmitted cancellation sequence from the mixed signal sequence received by the device.
  • step 418 the channel is decoded to calculate a bit error rate.
  • the device obtains the received signal sequence from the base station, it performs channel decoding and calculates the bit error rate.
  • step 419 it is determined whether the bit error rate is less than a preset threshold. If yes, step 420 is performed; if not, step 423 is performed.
  • step 420 it is determined whether to end the transmission, and if it is, the transmission is ended; if not, step 417 is performed.
  • Step 421 the pilot signal.
  • the pilot signal is a test signal in the signal transmitted by the device and is known. Therefore, the pilot signal can be used as a verification signal to verify the transmission function of the transmitted fallback channel.
  • Step 422 Modify the algorithm.
  • the device corrects the transmission fallback channel algorithm through an adaptive algorithm.
  • step 423 it is determined whether the channel tracking is normal. If so, step 416 is performed; if not, step 403 is performed.
  • the device verifies whether the device works normally by judging whether the channel tracking is normal. If the channel tracking is out of sync, the transmission can be restarted to fall back to the channel detection time slot and re-enter the digital elimination process.
  • the simultaneous co-frequency full-duplex self-interference signal cancellation method provided by the embodiment of the present invention can separate the self-interference signals in the received signal, thereby effectively eliminating the self-interference signals in the received signal, and avoid self-interference signals from receiving The effect of the signal.
  • an embodiment of the present invention provides a device for eliminating simultaneous interference at the same frequency and full duplex self-interference.
  • the device can be applied to the method for eliminating interference at the same frequency for full duplex self-interference provided by the embodiment corresponding to FIGS. in.
  • the device 7 includes: a processor 71, a memory 72, an isolator 73, and a communication bus 74; the communication bus 74 is used to implement a communication connection between the processor 71, the memory 72, and the isolator 73; the processor 71 is used to execute a program of simultaneous co-frequency full-duplex self-interference signal cancellation in the memory 72 to implement the following steps:
  • the processor 71 is further configured to separate the second signal in the first signal from the first interference signal through the isolator 73, and select the second signal from the first signal by screening.
  • the device further comprises a circulator 75, wherein:
  • the communication bus 74 is also used to implement a communication connection between the processor 71, the memory 72, the isolator 73, and the circulator 75; the processor 71 is also used to pass the second of the first signals through the isolator 73 and the circulator 75
  • the interference signal, the second signal and the first interference signal are separated, and the second signal is obtained by screening from the first signal.
  • the processor 71 is further configured to obtain a first intensity value of the second signal based on a preset first phase offset amount and a preset first attenuation amount.
  • the second signal is a received signal corresponding to the transmitted third signal.
  • the second signal Based on the first intensity value of the second signal, adjusting a preset first phase offset and a preset first attenuation to obtain a second phase offset and a second attenuation; based on the second phase offset and The second attenuation value is used to obtain the second intensity value of the second signal; if the second intensity value of the second signal is less than the first preset threshold, the target phase offset amount and the second phase offset amount are determined based on the second phase offset amount and the second attenuation amount.
  • Target attenuation; based on the target phase offset and target attenuation, the second signal is processed to obtain the target signal.
  • the second phase offset amount and the second attenuation amount are adjusted based on the second intensity value of the second signal to obtain a third phase offset amount.
  • the third attenuation if the third intensity value of the second signal corresponding to the third phase offset and the third attenuation is greater than or equal to the first preset threshold, adjusting the third phase offset and the third attenuation, Until the intensity value of the second signal corresponding to the adjusted phase shift amount and the adjusted attenuation amount is less than the first preset threshold.
  • the processor 71 is configured to execute the determination of the target phase offset amount and the target attenuation amount based on the second phase offset amount and the second attenuation amount in the memory 72 to implement the following steps:
  • the amount determines the amount of target phase offset and the amount of target attenuation.
  • the second phase offset and the second attenuation are adjusted based on the first power value of the second signal to obtain a fourth phase offset And the fourth attenuation; if the second power value of the second signal corresponding to the fourth phase offset and the fourth attenuation is greater than or equal to a second preset threshold, adjusting the fourth phase offset and the fourth attenuation, Until the power value of the second signal corresponding to the adjusted phase shift amount and the adjusted attenuation amount is less than the second preset threshold.
  • the processor 71 is configured to execute the processing of the second signal based on the target phase offset and the target attenuation in the memory 72 to obtain a target signal, so as to implement the following steps:
  • the third interference signal in the second signal is superimposed to obtain the target signal.
  • the processor 71 is configured to perform a superposition process on the third interference signal in the second signal based on the target phase offset and the target attenuation in the memory 72 to obtain the target signal, so as to achieve the following: step:
  • a transmission cancellation function is obtained; based on the target phase offset, the target attenuation, and the transmission cancellation function, the fourth interference signal in the second signal is subjected to differential processing to obtain the target signal.
  • the processor 71 is configured to execute the second signal function and the third signal function in the memory 72 to obtain a transmission cancellation function to implement the following steps:
  • the processor 71 is configured to execute the operation of the third signal function and the first transmission function in the memory 72 to obtain a first transmission cancellation function, so as to implement the following steps:
  • the verification signal is a received signal corresponding to the transmitted fourth signal.
  • a second emission cancellation function is obtained; a first matching degree between the verification signal function and the second transmission cancellation function is obtained; if the first matching degree is less than a third preset threshold, the third signal is The function and the first transmission function are operated to obtain a first emission cancellation function.
  • a fifth signal function and a sixth signal function are obtained.
  • the fifth signal is a received signal corresponding to the transmitted sixth signal.
  • the fifth signal function and the sixth signal function are operated until the matching degree between the obtained fifth signal function and the emission cancellation function obtained based on the verification signal function and the fourth signal function is less than a third preset threshold.
  • the simultaneous co-frequency full-duplex self-interference signal canceling device obtains a first signal including a second signal and a first interference signal, and then the second signal in the first signal is summed with the isolator through an isolator.
  • the first interference signal is separated, and the second signal is obtained by screening from the first signal; or, the first signal including the first interference signal, the second interference signal, and the second signal is obtained, and the first signal is separated by an isolator and a circulator.
  • the first interference signal, the second interference signal and the second signal in the signal are separated, and the second signal is filtered from the first signal; then, based on a preset first phase offset and a preset first attenuation To obtain the first intensity value of the second signal, and based on the first intensity value of the second signal, adjust a preset first phase offset amount and a preset first attenuation amount to obtain a second phase offset amount and A second attenuation amount; obtaining a second intensity value of the second signal based on the second phase offset amount and the second attenuation amount; if the second intensity value of the second signal is less than the first preset threshold value, based on the second phase offset Quantity and second
  • the attenuation amount determines the target phase offset amount and the target attenuation amount; therefore, based on the target phase offset amount and the target attenuation amount, the second signal is processed to obtain the target signal. In this way, the self-interference signal in the received signal can be separated, thereby The self-interference signal in
  • an embodiment of the present invention provides a computer-readable storage medium.
  • the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors. To achieve the following steps:
  • the second interference signal, the second signal and the first interference signal in the first signal are separated by an isolator and a circulator, and the second signal is obtained by screening from the first signal; based on a preset first phase offset A shift amount and a preset first attenuation amount are used to obtain a first intensity value of the second signal.
  • the second signal is a received signal corresponding to the transmitted third signal.
  • the second signal Based on the first intensity value of the second signal, adjusting a preset first phase offset and a preset first attenuation to obtain a second phase offset and a second attenuation; based on the second phase offset and The second attenuation value is used to obtain the second intensity value of the second signal; if the second intensity value of the second signal is less than the first preset threshold, the target phase offset amount and the second phase offset amount are determined based on the second phase offset amount and the second attenuation amount.
  • Target attenuation; based on the target phase offset and target attenuation, the second signal is processed to obtain the target signal.
  • the second phase offset amount and the second attenuation amount are adjusted based on the second intensity value of the second signal to obtain a third phase offset amount.
  • the third attenuation if the third intensity value of the second signal corresponding to the third phase offset and the third attenuation is greater than or equal to the first preset threshold, adjusting the third phase offset and the third attenuation, Until the intensity value of the second signal corresponding to the adjusted phase shift amount and the adjusted attenuation amount is less than the first preset threshold.
  • the one or more programs may be executed by one or more processors to determine a target phase offset amount and a target attenuation amount based on the second phase offset amount and the second attenuation amount to implement the following step:
  • the amount determines the amount of target phase offset and the amount of target attenuation.
  • the second phase offset and the second attenuation are adjusted based on the first power value of the second signal to obtain a fourth phase offset And the fourth attenuation; if the second power value of the second signal corresponding to the fourth phase offset and the fourth attenuation is greater than or equal to a second preset threshold, adjusting the fourth phase offset and the fourth attenuation, Until the power value of the second signal corresponding to the adjusted phase shift amount and the adjusted attenuation amount is less than the second preset threshold.
  • the one or more programs may be executed by one or more processors to obtain the target signal by processing the second signal based on the target phase offset and the target attenuation, so as to implement the following steps:
  • the third interference signal in the second signal is superimposed to obtain the target signal.
  • the one or more programs may be executed by one or more processors based on the target phase offset amount and the target attenuation amount, and superimpose the third interference signal in the second signal to obtain the target. Signal to achieve the following steps:
  • a transmission cancellation function is obtained; based on the target phase offset, the target attenuation, and the transmission cancellation function, the fourth interference signal in the second signal is subjected to differential processing to obtain the target signal.
  • the one or more programs may be executed by one or more processors to obtain a transmission cancellation function based on the second signal function and the third signal function to implement the following steps:
  • the one or more programs may be executed by one or more processors to perform operations on the third signal function and the first transmission function to obtain a first transmission cancellation function to implement the following steps:
  • the verification signal is a received signal corresponding to the transmitted fourth signal.
  • a second emission cancellation function is obtained; a first matching degree between the verification signal function and the second transmission cancellation function is obtained; if the first matching degree is less than a third preset threshold, the third signal is The function and the first transmission function are operated to obtain a first emission cancellation function.
  • a fifth signal function and a sixth signal function are obtained.
  • the fifth signal is a received signal corresponding to the transmitted sixth signal.
  • the fifth signal function and the sixth signal function are operated until the matching degree between the obtained fifth signal function and the emission cancellation function obtained based on the verification signal function and the fourth signal function is less than a third preset threshold.
  • An embodiment of the present invention provides a computer program product.
  • the computer program product includes a computer program stored on a non-transitory computer-readable storage medium.
  • the computer program includes program instructions. When the program instructions are executed by a computer, To cause the computer to execute the method in any of the foregoing method embodiments.
  • the embodiments of the present invention may be provided as a method, a system, or a computer program product. Therefore, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, magnetic disk memory, optical memory, etc.) containing computer-usable program code.
  • a computer-usable storage media including, but not limited to, magnetic disk memory, optical memory, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a particular manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions
  • the device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

L'invention concerne un procédé d'élimination de signal d'auto-brouillage bilatéral simultané et à co-fréquence. Le procédé consiste : à acquérir un premier signal ; à séparer un second signal et un premier signal de brouillage dans le premier signal au moyen d'un isolateur, et à filtrer le premier signal afin d'obtenir le second signal, ou à séparer un second signal de brouillage, un second signal et un premier signal de brouillage dans le premier signal au moyen d'un isolateur et d'un circulateur, et à filtrer le premier signal afin d'obtenir le second signal ; à acquérir une première valeur d'intensité du second signal en fonction d'une première quantité de décalage de phase prédéfinie et d'une première quantité d'atténuation prédéfinie ; à régler la première quantité de décalage de phase prédéfinie et la première quantité d'atténuation prédéfinie en fonction de la première valeur d'intensité du second signal, et à déterminer une quantité de décalage de phase cible et une quantité d'atténuation cible ; et à traiter le second signal en fonction de la quantité de décalage de phase cible et de la quantité d'atténuation cible afin d'obtenir un signal cible. L'invention concerne également un dispositif d'élimination de signal d'auto-brouillage bilatéral simultané à co-fréquence et un support d'informations lisible par ordinateur.
PCT/CN2019/099507 2018-09-17 2019-08-06 Procédé et dispositif d'élimination de signal d'auto-brouillage bilatéral simultané et à co-fréquence et support d'informations WO2020057281A1 (fr)

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