WO2020057281A1

WO2020057281A1 - Simultaneous and co-frequency full-duplex self-interference signal elimination method and device, and storage medium

Info

Publication number: WO2020057281A1
Application number: PCT/CN2019/099507
Authority: WO
Inventors: 秦宇
Original assignee: 西安中兴新软件有限责任公司
Priority date: 2018-09-17
Filing date: 2019-08-06
Publication date: 2020-03-26
Also published as: CN110912582B; CN110912582A

Abstract

Disclosed is a simultaneous and co-frequency full-duplex self-interference signal elimination method. The method comprises: acquiring a first signal; separating a second signal and a first interference signal in the first signal by means of an isolator, and screening the first signal to obtain the second signal, or separating a second interference signal, a second signal and a first interference signal in the first signal by means of an isolator and a circulator, and screening the first signal to obtain the second signal; acquiring a first strength value of the second signal based on a pre-set first phase offset amount and a pre-set first attenuation amount; adjusting the pre-set first phase offset amount and the pre-set first attenuation amount based on the first strength value of the second signal, and determining a target phase offset amount and a target attenuation amount; and processing the second signal based on the target phase offset amount and the target attenuation amount to obtain a target signal. Also disclosed are a simultaneous and co-frequency full-duplex self-interference signal elimination device and a computer-readable storage medium.

Description

Simultaneous co-frequency full-duplex self-interference signal elimination method, device and storage medium

cross reference

The present invention requires the priority of a Chinese patent application submitted to the Chinese Patent Office on September 17, 2018, with an application number of 201811081946.X and an invention name of "simultaneous co-frequency full-duplex self-interference signal cancellation method, device and storage medium" Right, the entire contents of this application are incorporated in the present invention by reference.

Technical field

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.

Background technique

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. Compared with Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) modes, 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. However, in the process of transmitting and receiving signals in both directions, the transmitted signals fall into the receiving channel through various channels and thus interfere with the received useful signals.

Theoretically, 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. However, in some cases, the elimination of simultaneous co-frequency full-duplex self-interfering signals only stays at the conceptual level, and there is no operational implementation solution.

Summary of the Invention

In view of this, 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.

To achieve the above object, the technical solution of the embodiment of the present invention is implemented as follows:

A method for eliminating a self-interference signal at the same frequency and full duplex. The method 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 is processed to obtain a target signal.

A simultaneous co-frequency full-duplex self-interference signal cancellation device, the 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 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; if the second intensity value of the second signal is less than a first preset threshold, determine a target phase based on the second phase offset and the second attenuation amount An offset and a target attenuation; based on the target phase offset and the target attenuation, processing the second signal to obtain a target signal.

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.

BRIEF DESCRIPTION OF THE DRAWINGS

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;

2 is a circuit block diagram of a device for separating transmitting and receiving antennas according to an embodiment of the present invention;

3 is a circuit block diagram of a device for transmitting and receiving a common antenna according to an embodiment of the present invention;

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.

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.

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.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments 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.

In 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.

It should be noted that, at the same time, 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, and the second interference signal is Interference signals generated when the transmitted signal falls directly into the receiving channel of the device.

Exemplarily, in order to facilitate understanding of steps 101 to 102, the embodiment of the present invention provides the following two implementation manners of filtering and obtaining the second signal from the first signal.

First, combined with a circuit block diagram of a device for transmitting and receiving antenna separation provided by an embodiment of the present invention, 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.

Specifically, the baseband and control unit 21 controls the radio frequency transmission unit 22 to transmit signals. After 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. At this time, 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. In order to avoid the influence of the first interference signal on the second transmission signal, 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.

It should be noted that, for a device with separate transmitting and receiving antennas, there is no need to use a circulator because there is no way for the transmitted signal to directly enter the receiving channel of the device. However, for the interference signal generated by entering the transmission channel of the device, an isolator can be used on the transmission channel to achieve isolation.

Secondly, in combination with a circuit block diagram of a device for transmitting and receiving a common antenna provided by an embodiment of the present invention, a first interference signal, a second interference signal and a second signal in the first signal are separated by an isolator and a circulator. , And the second signal is selected from the first signal for specific description. Please refer to FIG. 3, 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 receiver 29, the combiner 31, the second filter 32, the low-noise amplifier 33, and the radio frequency receiving unit 34.

Specifically, the baseband and control unit 21 controls the radio frequency transmission unit 22 to transmit signals. After 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. After 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. In order to avoid the influence of the first interference signal and the second interference signal, the first interference signal and the second interference signal can be absorbed by the circulator 35, and the remaining signal is the second signal.

After the second transmitted signal is processed by the adjustable phase shifter 28 and the adjustable attenuator 29, 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.

It should be noted that the phase represents the initial position of the signal waveform at a specific moment, and the phase offset represents the offset of the signal waveform from the initial position; the amplitude represents the peak of the signal waveform, and the attenuation represents the peak value of the signal after transmission. The amount of change.

Specifically, the first phase offset amount and the first attenuation amount can be preset according to empirical values. For example, the preset first phase offset is -180 degrees, and 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.

It should be noted that since different phase offsets and attenuations will affect the strength value of the received signal, the 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.

It should be noted that after obtaining the adjusted phase offset and 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.

Specifically, when 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.

It should be noted that, for devices with a common antenna for transmitting and receiving, 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. Although 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. Advantageously, 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 provided 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. In this way, 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 self-interference signal on the received signal is avoided.

Based on the foregoing embodiments, 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.

In 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.

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.

Step 207: Process the second signal to obtain a target signal based on the target phase offset and the target attenuation.

In step 207, 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:

Based on the target phase offset amount and the target attenuation amount, the third interference signal in the second signal is superimposed to obtain the target signal.

It should be noted that 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.

In other embodiments of the present invention, 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.

It should be noted that descriptions of the same steps and the same contents in this embodiment as in other embodiments may refer to descriptions in other embodiments, and are not repeated here.

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.

Based on the foregoing embodiment, in other embodiments of the present invention, if the second intensity value of the second signal is less than the first preset threshold in step 206, the target phase offset is determined based on the second phase offset and the second attenuation. And target attenuation can also be achieved by the following steps:

A1. If the second intensity value of the second signal is less than the first preset threshold, 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.

It should be noted that if the self-interference signal is completely eliminated, 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.

A2. If the first power value of the second signal is less than a second preset threshold, 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.

It should be noted that the second preset threshold may be any real number, which is not limited in the embodiment of the present invention.

A3. If the first power value of the second signal is greater than or equal to the second preset threshold, adjust the second phase offset and the second attenuation based on the first power value of the second signal to obtain a fourth phase offset and Fourth attenuation.

A4. 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 the second preset threshold, adjust the fourth phase offset and the fourth attenuation until the adjusted The power value of the second signal corresponding to the phase offset amount and the adjusted attenuation amount is less than a second preset threshold.

It should be noted that since different phase offsets and attenuations also affect the power value of the received signal, the phase offsets and attenuations can be adjusted based on the power values of the received signals. To obtain accurate self-interference signal cancellation parameters.

To facilitate a better understanding of the above steps 201 to 206, a specific implementation process is taken as an example for illustration. As shown in Figure 5, the process includes the following steps:

Step 301: Place in a microwave dark room.

It should be noted that 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.

It should be noted that the user presets the first phase offset of the adjustable phase shifter in the device to -180 degrees.

Among them, 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.

It should be noted that the user presets the first attenuation amount of the adjustable attenuator in the device to 0 dB.

Among them, 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.

It should be noted that 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.

Specifically, the device detects a first strength value of the received second signal. The second signal is a signal received for the transmitted third signal.

It should be noted that the received signal strength indicator (Received Signal Strength Indicator) (RSSI) characterizes the strength of the received overall signal.

In 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.

Specifically, the device fixes the first phase offset and continuously adjusts the attenuation of the adjustable attenuator in the device.

It should be noted that when 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.

It should be noted that, as the attenuation amount changes, 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.

It should be noted that after the second attenuation amount meeting the requirements is obtained, 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.

It should be noted that 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.

It should be noted that, in order to more accurately adjust the attenuation of the adjustable attenuator and the phase offset of the adjustable phase shifter, the device can detect the reference signal received power (Reference Living Power, RSRP) through a module that receives a useful signal. ).

In 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.

It should be noted that 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.

It should be noted that because 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.

It should be noted that by detecting that the RSRP value is less than a preset threshold, 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.

It should be noted that 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.

It should be noted that by detecting that the RSRP value is less than a preset threshold, the device can obtain a target phase offset that meets the requirements at this time.

In step 317, the target attenuation amount and the target phase offset amount are stored in a memory.

It should be noted that 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.

Based on the foregoing embodiment, in other embodiments of the present invention, 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:

B1. Obtain the emission cancellation function based on the second signal function and the third signal function.

It should be noted that the second signal function represents the second signal, and 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.

Wherein, obtaining the emission cancellation function based on the second signal function and the third signal function can be implemented in the following ways:

B2. Obtain a second signal function and a third signal function, and perform an operation on the third signal function and the second signal function to obtain a first transmission function.

B3. Operate the third signal function and the first transmission function to obtain a first emission cancellation function.

It should be noted that the first transmission function represents a change of the third signal after the transmission process.

B4. Differentiate the fourth interference signal in the second signal based on the target phase offset, the target attenuation, and the emission cancellation function to obtain the target signal.

It should be noted that 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.

In other embodiments of the present invention, 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:

C1, Get the verification signal function.

The verification signal is a received signal corresponding to the transmitted fourth signal.

C2. Based on the fourth signal function and the first transmission function, a second emission cancellation function is obtained.

C3. Obtain a first matching degree between the verification signal function and the second emission cancellation function.

C4. If the first matching degree is less than the third preset threshold, perform a calculation on the third signal function and the first transmission function to obtain a first emission cancellation function.

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.

C5. If the first matching degree is greater than or equal to the third preset threshold, obtain a fifth signal function and a sixth signal function.

The fifth signal is a received signal corresponding to the transmitted sixth signal.

C6. Perform operations on the fifth signal function and the sixth signal function until the obtained fifth signal function and the emission cancellation function obtained based on the verification signal function and the fourth signal function are less than the third preset threshold.

It should be noted that if 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.

To facilitate a better understanding of the technical solutions of the embodiments of the present invention, a specific implementation process is taken as an example for description. As shown in Figure 6, the process includes the following steps:

Step 401: Connect to the network.

It should be noted that 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.

It should be noted that 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.

It should be noted that during the detection time slot, the device does not receive signals transmitted by the base station.

Step 405: Radio frequency elimination on-site calibration.

It should be noted that, taking into account the special conditions during the use of the device, such as the device antenna being held by the hand, or the device being close to a metal body or other highly reflective objects, and the device status significantly changing, the device's antenna performance will be greater. Variety. At this time, 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. That is, 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.

It should be noted that 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.

It should be noted that the device transmits a third signal.

Step 408: The received signal is demodulated.

It should be noted that the device demodulates the received second signal.

Step 409: Obtain a transfer function.

It should be noted that 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. Among them, the transmission function of the fallback channel characterizes the change of the signal during transmission.

Step 410: Obtain a transmission cancellation function.

It should be noted that the device performs an operation on the transmitted third signal function and the first transmission function to obtain a first transmission cancellation function.

In step 411, a verification signal is transmitted.

It should be noted that, in order to verify whether the transmission function of the falling channel is correct, the device transmits a fourth signal at this time.

Step 412: The received verification signal is demodulated.

It should be noted that the device demodulates the received verification signal. The verification signal is a received signal corresponding to the transmitted fourth signal.

Step 413: Verify.

It should be noted that 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.

In 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.

It should be noted that the matching degree represents the similarity of the two signal waveforms.

Step 415: Exit the transmission fallback channel detection time slot.

It should be noted that when the degree of matching between the demodulated verification signal function and the second transmission cancellation function is less than a preset threshold, it indicates that there is no error in the transmission function of the falling channel. Therefore, it is necessary to exit the transmission fallback channel detection slot.

Step 416: The base station is notified to enable the simultaneous full-frequency full-duplex transmission function.

It should be noted that 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.

It should be noted that 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.

In step 418, the channel is decoded to calculate a bit error rate.

It should be noted that after the device obtains the received signal sequence from the base station, it performs channel decoding and calculates the bit error rate.

In 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.

In 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.

It should be noted that 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.

It should be noted that when the transmission function of the transmission fallback channel is incorrect, the device corrects the transmission fallback channel algorithm through an adaptive algorithm.

In step 423, it is determined whether the channel tracking is normal. If so, step 416 is performed; if not, step 403 is performed.

It should be noted that 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.

Based on the foregoing embodiments, 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. Referring to FIG. 7, 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:

Get the first signal.

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.

In other embodiments of the invention, 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.

In other embodiments of the present invention, 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.

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.

Correspondingly, if the second intensity value of the second signal is greater than or equal to the first preset threshold, 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. And 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.

In other embodiments of the present invention, 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:

Obtaining the first power value of the second signal based on the second phase offset and the second attenuation; if the first power value of the second signal is less than the second preset threshold, based on the second phase offset and the second attenuation The amount determines the amount of target phase offset and the amount of target attenuation.

Correspondingly, if the first power value of the second signal is greater than or equal to the second preset threshold, 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.

In other embodiments of the present invention, 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:

In other embodiments of the present invention, 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:

Based on the second signal function and the third signal function, 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.

In other embodiments of the present invention, 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:

Obtain a second signal function and a third signal function; perform an operation on the third signal function and the second signal function to obtain a first transmission function; and perform a calculation on the third signal function and the first transmission function to obtain a first emission cancellation function.

In other embodiments of the present invention, 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:

Get the verification signal function.

Based on the fourth signal function and the first transmission function, 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.

Correspondingly, if the first matching degree is greater than or equal to the third preset threshold, a fifth signal function and a sixth signal function are obtained.

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.

It should be noted that, for the specific implementation process of the steps performed by the processor in this embodiment, reference may be made to the implementation process in the simultaneous co-frequency full-duplex self-interference signal cancellation method provided by the embodiment corresponding to FIGS. 1 and 4. No longer.

The simultaneous co-frequency full-duplex self-interference signal canceling device provided by the embodiment of the present invention 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 the received signal is effectively eliminated, and the influence of the self-interference signal on the received signal is avoided.

Based on the foregoing embodiments, 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:

Obtaining a first signal; separating the second signal in the first signal from the first interference signal through an isolator, and screening the first signal to obtain a second signal.

Or, 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.

In other embodiments of the present invention, 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:

In other embodiments of the present invention, 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:

In other embodiments of the present invention, 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:

In other embodiments of the present invention, 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:

In other embodiments of the present invention, 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:

Get the verification signal function.

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.

Those skilled in the art should understand that 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.

The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, so that the instructions generated by the processor of the computer or other programmable data processing device are used to generate instructions Means for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

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.

The above description is only the preferred embodiments of the present invention, and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in Within the scope of the present invention.

Claims

A method for eliminating simultaneous full-duplex self-interference signals at the same frequency, wherein the method includes:

Obtaining a first signal;

Separating the second signal in the first signal from the first interference signal through an isolator, and filtering the second signal to obtain the second signal;

Or separating the second interference signal, the second signal, and the first interference signal in the first signal through the isolator and the circulator, and filtering the first signal to obtain the Second signal

Obtaining a first intensity value of the second signal based on a preset first phase offset and a preset first attenuation amount; wherein the second signal is a received signal corresponding to the transmitted third signal ;

Adjusting the preset first phase offset amount and the 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;

Obtaining a second intensity value of the second signal based on the second phase offset and a second attenuation amount;

If a second intensity value of the second signal is less than a first preset threshold, determining a target phase offset amount and a target attenuation amount based on the second phase offset amount and the second attenuation amount;

Processing the second signal to obtain a target signal based on the target phase offset amount and the target attenuation amount.
The method according to claim 1, further comprising:

If the second intensity value of the second signal is greater than or equal to the first preset threshold, adjusting the second phase offset amount and the second attenuation amount based on the second intensity value of the second signal, Obtaining a third phase offset amount and a third attenuation amount;

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 The third attenuation amount is described until the intensity value of the second signal corresponding to the adjusted phase offset amount and the adjusted attenuation amount is less than the first preset threshold.
The method according to claim 1, wherein if the second intensity value of the second signal is less than a first preset threshold, determining a target phase based on the second phase offset and the second attenuation amount Offset and target attenuation, including:

Obtaining a first power value of the second signal based on the second phase offset amount and the second attenuation amount;

If the first power value of the second signal is less than a second preset threshold, a target phase offset amount and a target attenuation amount are determined based on the second phase offset amount and the second attenuation amount.
The method according to claim 2, wherein the method further comprises:

If the first power value of the second signal is greater than or equal to the second preset threshold, adjusting the second phase offset amount and the second attenuation amount based on the first power value of the second signal, Obtaining a fourth phase offset and a 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 the second preset threshold, adjusting the fourth phase offset and the The fourth attenuation amount is described until the power value of the second signal corresponding to the adjusted phase offset amount and the adjusted attenuation amount is less than the second preset threshold.
The method according to any one of claims 1-4, wherein the processing the second signal based on the target phase offset amount and the target attenuation amount to obtain a target signal comprises:

Based on the target phase offset amount and the target attenuation amount, a third interference signal in the second signal is superimposed to obtain a target signal.
The method according to claim 5, wherein, based on the target phase offset and the target attenuation, superimposing the third interference signal in the second signal to obtain a target signal comprises:

Obtaining an emission cancellation function based on the second signal function and the third signal function;

Based on the target phase offset amount, the target attenuation amount, and the emission cancellation function, a fourth interference signal in the second signal is subjected to differential processing to obtain a target signal.
The method according to claim 6, wherein the obtaining an emission cancellation function based on the second signal function and the third signal function comprises:

Acquiring the second signal function and the third signal function;

Performing an operation on the third signal function and the second signal function to obtain a first transmission function;

Operate the third signal function and the first transmission function to obtain a first emission cancellation function.
The method according to claim 7, wherein the operation of the third signal function and the first transmission function to obtain a first emission cancellation function comprises:

Acquiring a verification signal function; wherein the verification signal is a received signal corresponding to a fourth signal transmitted;

Obtaining a second emission cancellation function based on the fourth signal function and the first transmission function;

Acquiring a first matching degree between the verification signal function and the second emission cancellation function;

If the first matching degree is less than a third preset threshold, the third signal function and the first transmission function are operated to obtain a first emission cancellation function.
The method according to claim 8, wherein the method further comprises:

If the first matching degree is greater than or equal to the third preset threshold, obtaining a fifth signal function and a sixth signal function; wherein the fifth signal is a received signal corresponding to the transmitted sixth signal;

Perform operations on the fifth signal function and the sixth signal function until the acquired fifth signal function and the emission cancellation function obtained based on the verification signal function and the fourth signal function are less than the matching degree The third preset threshold.
A simultaneous co-frequency full-duplex self-interference signal cancellation device, wherein the device includes: a processor, a memory, an isolator, and a communication bus;

The communication bus is used to implement a communication connection between the processor, the memory, and the isolator;

The processor is configured to obtain a first signal;

The processor is further configured to separate the second signal in the first signal from the first interference signal through the isolator, and obtain the second signal by filtering from the first signal;

The device further includes a circulator, wherein:

The processor is further configured to separate the second interference signal, the second signal, and the first interference signal from the first signal through the isolator and the circulator, and remove Screening the first signal to obtain the second signal;

The processor is further configured to obtain a first intensity value of the second signal based on a preset first phase offset and a preset first attenuation amount, wherein the second signal is a transmitted first Received signal corresponding to three signals;

Adjusting the preset first phase offset amount and the 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;

Obtaining a second intensity value of the second signal based on the second phase offset and a second attenuation amount;

If a second intensity value of the second signal is less than a first preset threshold, determining a target phase offset amount and a target attenuation amount based on the second phase offset amount and the second attenuation amount;

Processing the second signal to obtain a target signal based on the target phase offset amount and the target attenuation amount.
A computer-readable storage medium, wherein 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 implement claims 1 to 9 The steps of the simultaneous co-frequency full-duplex self-interference signal cancellation method according to any one of the preceding claims.