CN110536329B

CN110536329B - Interference signal processing method and terminal

Info

Publication number: CN110536329B
Application number: CN201810503814.5A
Authority: CN
Inventors: 马猛; 刘昊; 秦飞
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2018-05-23
Filing date: 2018-05-23
Publication date: 2023-02-21
Anticipated expiration: 2038-05-23
Also published as: CN110536329A

Abstract

The embodiment of the invention provides an interference signal processing method and a terminal, wherein the method comprises the following steps: determining a first parameter corresponding to an even harmonic nonlinear interference signal model in a specific frequency range, wherein the specific frequency range is a frequency range in which a signal of a first link generates an even harmonic interference signal at a double frequency, and the double frequency is a double frequency of a carrier frequency of the first link; reconstructing a first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter to obtain an even harmonic interference signal, wherein the first baseband signal is a baseband signal transmitted by the terminal on a first link; and removing the even harmonic interference signal in a received signal, wherein the received signal is the received signal of the terminal in the specific frequency range of the second link. The embodiment of the invention can reduce the interference of the terminal.

Description

Interference signal processing method and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an interference signal processing method and a terminal.

Background

At the fifth generation new air interface (5) ^th generation New Radio,5G NR) systems support Dual Connectivity (duoco) technologies, such as: long Term Evolution (LTE) and NR dual connectivity technologies. Since in the dual connectivity technology, the terminal may perform signal transmission on multiple links at the same time, the signals transmitted on the multiple links may generate interference signals. For example: when the downlink carrier frequency is near the double frequency of the uplink carrier frequency in the LTE and NR dual connection, the received signal of the terminal receiver at the high frequency carrier will be interfered by the even harmonic generated by the signal at the low frequency carrier frequency transmitted by the terminal. Therefore, the problem that even harmonic interference is large exists in the current terminal.

Disclosure of Invention

The embodiment of the invention provides an interference signal processing method and a terminal, aiming at solving the problem that the terminal has larger even harmonic interference.

In a first aspect, an embodiment of the present invention provides an interference signal processing method, applied to a terminal, including:

determining a first parameter corresponding to an even harmonic nonlinear interference signal model in a specific frequency range, wherein the specific frequency range is a frequency range in which a signal of a first link generates an even harmonic interference signal at a double frequency, and the double frequency is a double frequency of a carrier frequency of the first link;

reconstructing a first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter to obtain an even harmonic interference signal, wherein the first baseband signal is a baseband signal transmitted by the terminal on a first link;

and removing the even harmonic interference signal in a received signal, wherein the received signal is the received signal of the terminal in the specific frequency range of the second link.

In a second aspect, an embodiment of the present invention provides a terminal, including:

a first determining module, configured to determine a first parameter corresponding to an even harmonic nonlinear interference signal model in a specific frequency range, where the specific frequency range is a frequency range in which a signal of a first link generates an even harmonic interference signal at a double frequency, and the double frequency is a double frequency of a carrier frequency of the first link;

a first reconstruction module, configured to reconstruct a first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter, to obtain an even harmonic interference signal, where the first baseband signal is a baseband signal transmitted by the terminal on a first link;

and a first removing module, configured to remove the even harmonic interference signal in a received signal, where the received signal is a received signal of the terminal in the specific frequency range of the second link.

In a third aspect, an embodiment of the present invention provides a terminal, including: the interference signal processing method comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps in the interference signal processing method provided by the embodiment of the invention when being executed by the processor.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of the interference signal processing method provided in the embodiment of the present invention.

The embodiment of the invention can reduce the interference of the terminal.

Drawings

Fig. 1 is a block diagram of a network system to which an embodiment of the present invention is applicable;

fig. 2 is a flowchart of an interference signal processing method according to an embodiment of the present invention;

fig. 3 is a flowchart of another interference signal processing method according to an embodiment of the present invention;

fig. 4 is a flowchart of another interference signal processing method according to an embodiment of the present invention;

fig. 5 is a schematic diagram of another interference signal processing method according to an embodiment of the present invention;

fig. 6 is a structural diagram of a terminal according to an embodiment of the present invention;

FIG. 7 is a block diagram of a computer system another structure of the terminal of (1);

fig. 8 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 9 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 10 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 11 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 12 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 13 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 14 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 15 is a block diagram of another terminal 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "comprises," "comprising," or any other variation thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in the specification and claims means that at least one of the connected objects, such as a and/or B, means that three cases, a alone, B alone, and both a and B, exist.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.

Embodiments of the present invention are described below with reference to the accompanying drawings. The method for configuring the physical downlink control channel, the user equipment and the network side equipment provided by the embodiment of the invention can be applied to a wireless communication system. The wireless communication system may be a 5G system, an Evolved Long Term Evolution (lte) system, or a subsequent lte communication system.

Referring to fig. 1, fig. 1 is a structural diagram of a network system to which an embodiment of the present invention is applicable, and as shown in fig. 1, the network system includes a terminal 11 and at least one base station 12, where the terminal 11 may support a dual connectivity technology, and the dual connectivity technology may refer to that the terminal 11 may perform signal transmission of two links at the same time, for example: when the terminal performs downlink transmission on the 5G NR downlink, the terminal may also perform uplink transmission on the LTE uplink, and of course, both links performing transmission at the same time may be 5G NR links, which is not limited. The terminal 11 may also support a multi-connection technology, which may mean that the terminal 11 may perform signal transmission of multiple links (here, the multiple links may be understood as three or more links) at the same time. Specifically, the terminal 11 may be a User Equipment (UE) or other terminal-side Equipment, for example: it should be noted that, in the embodiment of the present invention, a specific type of the terminal 11 is not limited, and the terminal may be a terminal-side Device such as a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal digital assistant (PDA for short), a Mobile Internet Device (MID), or a Wearable Device (Wearable Device). The base station 12 may be a 4G base station, or a 5G base station, or a later-version base station, or a base station in other communication systems, or referred to as a node B, an evolved node B, or other words in the field, and the base station is not limited to a specific technical word as long as the same technical effect is achieved. It should be noted that, in the embodiment of the present invention, only the 5G base station is taken as an example, but the specific type of the base station is not limited. In the drawings, two base stations 12 are illustrated as examples, and the two base stations 12 may be the same base station or may be different base stations, for example: one base station 12 is an LTE base station and the other base station 12 is a 5G base station.

Referring to fig. 2, fig. 2 is a flowchart of an interference signal processing method according to an embodiment of the present invention, where the method is applied to a terminal, and as shown in fig. 2, the method includes the following steps:

step 201, determining a first parameter corresponding to an even harmonic nonlinear interference signal model in a specific frequency range, where the specific frequency range is a frequency range in which an even harmonic interference signal is generated by a signal of a first link at a double frequency, and the double frequency is a double frequency of a carrier frequency of the first link.

The even harmonic nonlinear interference signal model may be configured in advance by the terminal, or defined in advance in a protocol, or configured in advance to the terminal by the network side, etc., without limitation. Before step 201 is executed, the parameters of the even harmonic nonlinear interference signal model acquired by the terminal may be unknown, and the parameters of the even harmonic nonlinear interference signal model corresponding to the specific frequency range are determined in step 201.

The carrier frequency of the first link may be a carrier frequency of the second link, for example: and the first link is a 1.8GHz LTE uplink, the specific frequency range may be a frequency range from 3.4GHz to 3.7GHz, or a frequency range from 3.5GHz to 3.6GHz, etc., so that the interference of the first link to the second link (e.g., 3.5GHz NR downlink) can be removed by the method. Since the specific frequency range is a frequency range in which the signal of the first link generates an even harmonic interference signal at a double frequency, even harmonic interference can be removed.

The determining of the first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range may be determining the first parameter according to a signal component received by the terminal on the second link and transmitted by the terminal on the first link. Since the signal transmitted by the terminal on the first link is known to the terminal, and the signal component transmitted by the terminal on the first link and received by the terminal on the second link can be obtained by the even harmonic nonlinear interference signal model, except that the obtained signal component includes the unknown first parameter, so that the first parameter corresponding to the even harmonic nonlinear interference signal model in a specific frequency range can be estimated by transmitting the signal on the first link one or more times. Of course, in the embodiment of the present invention, the parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range may also be the first parameter obtained in advance, because when the interference performance of the terminal and the specific frequency range are fixed, then the first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range may also be fixed. Thus, in some embodiments, the parameter may be measured or estimated in advance, or the first parameter may be measured or estimated at one terminal and then applied to other terminals at the same terminal.

Step 202, reconstructing a first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter to obtain an even harmonic interference signal, where the first baseband signal is a baseband signal transmitted by the terminal on a first link.

After determining the parameters of the even harmonic nonlinear interference signal model, step 202 may reconstruct the baseband signal, for example: the baseband signal may be substituted into the interference signal model to obtain the reconstructed interference signal.

The baseband signal corresponding to the baseband signal transmitted by the terminal on the first link is used for reconstruction, so that the obtained interference signal is closer to or even the same as the real interference signal, and the interference elimination effect is improved.

Step 203, removing the even harmonic interference signal in a received signal, where the received signal is a received signal of the terminal in the specific frequency range of the second link.

The first link and the second link may be two links where the terminal performs data transmission simultaneously, for example: the first link is a downlink for downlink transmission between the terminal and the LTE base station, and the second link is an uplink for uplink transmission between the terminal and the NR base station, which is not limited, for example: in some scenarios, the first link is a downlink where the terminal transmits downlink with one NR base station, while the second link is an uplink where the terminal transmits uplink with another NR base station, and so on.

After reconstructing the even harmonic interference signal, step 203 may remove (or subtract) the even harmonic interference signal from the received signal to complete even harmonic interference cancellation.

It should be noted that, after reconstructing the even harmonic interference signal, step 203 may repeatedly use the even harmonic interference signal to perform interference removal, that is, in practical applications, step 203 may be repeatedly executed to perform interference removal on a plurality of received signals. And step 201 and step 202 may be performed once or according to a certain period to update the even harmonic interference signal.

It should be noted that the method provided in the embodiment of the present invention may be applied to a 5G NR system or a scenario in which a 5G NR system is combined with an LTE system, but the method is not limited to this, as long as it can achieve substantially the same function, and is applicable to other communication systems, for example: a 4G or 6G system or other communication system applying interference handling, etc. may be applied.

In the embodiment of the invention, the even harmonic interference signals reconstructed by the received signals can be removed through the steps, so that the interference of the terminal in the specific frequency range is reduced or eliminated.

Referring to fig. 3, fig. 3 is a flowchart of another interference signal processing method according to an embodiment of the present invention, as shown in fig. 3, including the following steps:

step 301, determining a first parameter corresponding to an even harmonic nonlinear interference signal model in a specific frequency range, where the specific frequency range is a frequency range in which a signal of a first link generates an even harmonic interference signal at a double frequency, and the double frequency is a double frequency of a carrier frequency of the first link.

As an optional implementation, the determining a first parameter corresponding to the even harmonic nonlinear interference signal model in a specific frequency range includes:

and estimating a first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range by using an even harmonic nonlinear component of a pilot signal received by the terminal on the second link, wherein the pilot signal is a pilot signal transmitted by the terminal on the first link.

The even harmonic nonlinear component may be an even harmonic nonlinear component received by the terminal on the second link when the terminal transmits the pilot signal on the first link. The even harmonic nonlinear interference signal model may be configured in advance by the terminal, or defined in advance in the protocol, or configured in advance by the network side, for example: a power series model or a nonlinear model, etc., which are not limited to the embodiments of the present invention, and the following formula can be specifically used for description.

It should be noted that, since the pilot signal is transmitted by the terminal and is known to the terminal, and the even harmonic nonlinear component is received by the terminal, it is also known to the terminal, and the relationship between the transmitted pilot signal and the received even harmonic nonlinear component can be represented by a specific nonlinear model or the even harmonic nonlinear interference signal model, and the parameters of the specific nonlinear model are the same as those of the even harmonic nonlinear interference signal model. Only in the specific non-linear model or the even harmonic non-linear interference signal model, different parameters may exist for different frequencies, so that in this embodiment, the first parameter corresponding to the specific non-linear model or the even harmonic non-linear interference signal model in the specific frequency range may be estimated by the even harmonic non-linear component.

The following describes, in a preferred embodiment, the estimation of the first parameter:

the estimating, by using the even harmonic nonlinear component of the pilot signal received by the terminal in the second link, a first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range may include:

receiving the pilot signal to obtain the even harmonic nonlinear component, wherein the relation between the even harmonic nonlinear component and the pilot signal is a nonlinear relation represented by a first nonlinear model, and parameters of the first nonlinear model are unknown parameters;

estimating parameters of the first nonlinear model using the even harmonic nonlinear component and the pilot signal, wherein the parameters of the first nonlinear model are the same as the first parameters

The first nonlinear model may be configured in advance by the terminal, or defined in advance in a protocol, or configured in advance by the network side to the terminal, which is not limited in this respect.

In this embodiment, the terminal may transmit the pilot signal through the transmitter of the first link, for example: the pilot signal may be transmitted once, multiple times, or periodically. Thus, the terminal receives the pilot signal and may obtain an even harmonic nonlinear component. The receiving of the pilot signal may be receiving the pilot signal by using a receiver of the terminal, where the receiver may correspond to the first link and the second link. For example: the first link is the LTE uplink and the second link NR downlink, and the pilot signal is transmitted by the first link, then the receiver receives the pilot signal, which can be understood as the second link receiving the pilot signal. Of course, in some embodiments, there may be multiple receivers, and different receivers correspond to different links, and then the receiving of the pilot signal may be performed by using a receiver corresponding to a second link to receive the pilot signal.

Since the relationship between the pilot signal transmitted by the terminal and the received even harmonic nonlinear component can be represented by the first nonlinear model, it can also be understood that the even harmonic nonlinear component can be derived by the first nonlinear model, except that the even harmonic nonlinear component includes an unknown first parameter, so that the first parameter can be estimated from the even harmonic nonlinear component actually received by the terminal.

In this embodiment, since the first parameter is estimated by the first nonlinear model, therefore, the estimated first parameter can be more accurate and the calculation amount is less.

Optionally, in this embodiment, the pilot signal is a dual-frequency signal located in the specific frequency range. Of course, in this embodiment, the pilot signal is not limited, for example: any complex signal (alternatively referred to as a complex pilot signal) may be used.

The complex signal may refer to a signal that can be transmitted by the terminal through the transmitter and includes a real part and an imaginary part, and specifically may refer to an arbitrary waveform signal that can be transmitted by the terminal through the transmitter, because the arbitrary waveform signal can be received by the terminal through the receiver, when the transmitted signal and the received signal are known, the first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range can be estimated. For example: signals within a certain frequency band or tri-band signals or quad-band signals, etc.

The following description will be made by taking the pilot signal as a dual-frequency signal located in the specific frequency range.

For example: two frequency points can be selected in the specific frequency range, the modulated pilot signal is a dual-frequency signal using the selected frequency points, and the pilot signal can be expressed as:

s＝A(cosω ₁ t+cosω ₂ t) (1)

wherein, ω is ₁ And ω ₂ Representing the angular frequency of the two frequency points used by the dual frequency signal and a representing the signal amplitude. The selected frequency points should be uniformly distributed in the interference bandwidth to be eliminated, so that the parameters estimated according to the pilot frequency can reflect the characteristics of the frequency band in which the frequency points are located. E.g. in a certain frequency range [ omega ] _L ,ω _H ]In interval, two frequency points can be selected

Of course, this is only a preferred embodiment and is not limited thereto.

In addition, to ensure that the parameters of the pilot-estimated even harmonic nonlinear interference signal model are as close as possible to the parameters of the nonlinear model of the signal, the pilot signal may have a power close to or the same as the power of the signal actually transmitted by the terminal on the first link, for example: the maximum module value of the pilot frequency is designed to be equal to the maximum module value of the signal, so that the accuracy of parameters of the even harmonic nonlinear interference signal model is improved.

For example: taking the first nonlinear model as an example of a power series model, the even harmonic nonlinear component of the pilot signal received in a specific frequency range can be represented by the following formula:

wherein, y is equal to the right _2ω Represents the non-linear component of the even harmonic, wherein a ₂ 、a ₄ And a ₆ H (ω) represents a phase rotation of the channel between the transmitter of the terminal and the receiver of the terminal at ω frequency for the parameters corresponding to the first nonlinear model at the specific frequency range. For example: the phase rotation of the frequency component in the received second harmonic is taken as the phase rotation h (ω) of the channel.

Note that the pilot signal has been substituted into the first nonlinear model in the above formula, that is, ω is the above ₁ 、ω ₂ And h (ω) is a variable, the formula can be understood as the above-described first nonlinear model.

In this way, the parameters of the first nonlinear model, that is, the first parameters of the even harmonic nonlinear interference signal model corresponding to the specific frequency range, can be obtained by performing parameter estimation using the even harmonic nonlinear component of the received pilot signal and the first nonlinear model in the above equation by using least squares or mean square error.

Next, the estimation of the first parameter will be described by taking a pilot signal as an example of a pilot signal in a certain frequency band located in the specific frequency range.

For example: one frequency point (for example, a central frequency point) may be selected from the frequency band, and the modulated pilot signal is a single-frequency signal using the selected frequency point, or the pilot sequence, and the pilot signal may be represented in the time domain as:

x(t)＝Re[x ^s (t)]cosωt-Im[x ^s (t)]sinωt＝Acosωt-Bsinωt (3)

wherein, A and B are the real part and imaginary part of the pilot signal, and omega is the transmitting frequency point. Thus, the even harmonic nonlinear component of the pilot signal received by the terminal in the specific frequency range is:

wherein, is equal to y on the right _2ω Representing the non-linear component of the even harmonic, a ₂ 、a ₄ And a ₆ H (ω) represents a phase rotation of a channel between a transmitter of the terminal and a receiver of the terminal at ω frequency, which is a parameter corresponding to the first nonlinear model at the specific frequency range. For example: the phase rotation of the frequency component in the received second harmonic is taken as the phase rotation h (ω) of the channel.

Note that the pilot signal has been substituted into the first nonlinear model in the above equation, that is, ω is the above equation ₁ 、ω ₂ And h (ω) are variables, the formula can be understood as the above-described first nonlinear model.

Thus, after obtaining N even harmonic nonlinear components (for example, receiving sampling symbols), and when N >4, the terminal may perform parameter estimation by using the above formula and using methods such as least squares or mean square error, so as to obtain parameters of the first nonlinear model, that is, first parameters corresponding to the even harmonic nonlinear interference signal model in the specific frequency range.

In this embodiment, the first nonlinear model is not limited to the nonlinear models shown in the above equations 2 and 4, the nonlinear models shown in the equations 2 and 4 are only corresponding dual-frequency signals and complex signals in a certain frequency band, and if the pilot signal is a three-frequency signal or a four-frequency signal, other corresponding nonlinear models may be used.

For example: can be represented by the formula g (x) = a ₁ x ¹ +a ₂ x ² +a ₃ x3+a ₄ x ⁴ +...+a _n x ⁿ A corresponding non-linear model is determined, wherein,n is even numbers to indicate even harmonic components, and n is odd numbers to indicate odd harmonic components.

Step 302, reconstructing a first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter to obtain an even harmonic interference signal, where the first baseband signal is a baseband signal transmitted by the terminal on a first link.

The reconstructing the first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter may be to substitute the first baseband signal into the even harmonic nonlinear interference signal model after determining the first parameter, so as to obtain the even harmonic interference signal.

In an optional implementation manner, the reconstructing the first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter to obtain an even harmonic interference signal includes:

acquiring the first baseband signal, wherein the first baseband signal is a time domain baseband signal or a frequency domain baseband signal;

and under the condition that the first baseband signal is used as a variable of the even harmonic nonlinear baseband signal model and the parameter is the first parameter, acquiring a nonlinear component corresponding to the even harmonic nonlinear baseband signal model, wherein the nonlinear component is the even harmonic interference signal.

For example: after the determination of the first parameter of the even harmonic nonlinear interference signal model, the interfering baseband signal transmitted by the transmitter (the first baseband signal transmitted by the terminal on the first link) is transmitted to the receiver (the receiver of the second link), wherein the first baseband signal can be digitally modulated on each subcarrier, for example: quadrature Phase Shift Keying (QPSK) modulation, or other digital modulation, without limitation. In addition, in this embodiment, the pilot signal and the baseband signal may be digitally modulated, then sent from the transmitting antenna through the digital-to-analog conversion module after up-conversion, and then down-converted and analog-to-digital converted at the receiving end after linear channel transmission.

In this embodiment, the interference signal in the specific frequency range may be reconstructed based on the even harmonic nonlinear interference signal model and the first parameter. The interference signal can be reconstructed in the time domain or in the frequency domain.

The first baseband signal may be an Orthogonal Frequency Division Multiplexing (OFDM) signal, in which the OFDM signal x is reconstructed in a time domain, for example ^s (t) time-domain interference reconstruction as a baseband signal, where the transmitted signal can be expressed as:

x(t)＝Re[x ^s (t)]cosωt-Im[x ^s (t)]sinωt＝Acosωt-Bsinωt (5)

where a and B are the real and imaginary parts of the OFDM time domain signal, and ω is the transmission frequency, such that the non-linear component of the interference signal in the above-mentioned specific frequency range is expressed as:

that is, the above formula is understood as the above even harmonic nonlinear interference signal model, wherein a is ₂ 、a ₄ And a ₆ For the first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range, h (ω) represents the phase rotation of the channel between the transmitter of the terminal and the receiver of the terminal at ω frequency.

And substituting the baseband signal into an even harmonic nonlinear interference signal model to obtain a reconstructed even harmonic interference signal represented by the formula.

It should be noted that, the above is only exemplified by time domain reconstruction, and the frequency domain reconstruction may be to bring the frequency domain baseband signal into an even harmonic nonlinear interference signal model with determined parameters to obtain an even harmonic interference signal reconstructed in the frequency domain.

In addition, in the embodiment of the present invention, the even harmonic nonlinear interference signal model is not limited to the above formula, for example: the first parameter of the above equation 6 includes a ₂ 、a ₄ And a ₆ And in some other embodiments may include only a ₂ And a ₄ And the even harmonic nonlinear interference signal model corresponding to the even harmonic component corresponding to the two parameters. Or in order to further improve the accuracy of the interference signal, a can be added on the basis of equation 6 ₈ And a ₁₀ Corresponding even harmonic components to improve the accuracy of the interfering signal.

Step 303, removing the even harmonic interference signal from the received signal, where the received signal is the received signal of the terminal in the specific frequency range of the second link.

The step 301 to the step 303 can remove even harmonic interference signals from the received signal to reduce the interference of the terminal. Since the even harmonic interference signal is non-linear, removing the even harmonic interference signal may also be referred to as removing the non-linear interference signal.

As an alternative implementation, as shown in fig. 3, the method may further include:

step 304, reconstructing an image interference signal of the first link relative to the second link;

and 305, removing the image interference signal in the received signal.

The mirror image component may be a mirror image component with a negative frequency due to a deviation between an amplitude and a phase of an orthogonal path generated by up-down frequency conversion of a transmission signal and a reception signal of the terminal when the terminal has an IQ path imbalance (or a severe IQ path imbalance), and the mirror image component may affect demodulation of the reception signal at a reception frequency point. The IQ path is represented as two orthogonal signals, i.e., an I path and a Q path.

In this embodiment, the image interference signal in the received signal may be removed, so that the interference removal performance of the terminal may be further improved.

In this embodiment, the execution order of

steps

304 and 305 and steps 301 to 303 is not limited, and for example: step 304 is performed first, and step 305 is performed simultaneously with step 303, or steps 301 to 303 may be performed first, and then steps 304 and 305 are performed, and so on.

Optionally, the method further includes:

determining a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range;

the reconstructing the image jamming signal of the first link relative to the second link includes:

and reconstructing a second baseband signal based on the even harmonic nonlinear image interference signal model and the second parameter to obtain the image interference signal, wherein the second baseband signal is an image component of a baseband signal transmitted by the terminal on the first link.

The even harmonic nonlinear image interference signal model may be configured in advance by the terminal, or defined in advance in the protocol, or configured in advance by the network side, for example: a power series model or a nonlinear model, etc., which are not limited to the embodiments of the present invention, and the following formula can be specifically used for description.

The second parameter for determining the even harmonic nonlinear image interference signal model corresponding to the specific frequency range may be determined according to the fact that the terminal receives an image component transmitted by the terminal on the first link on the second link. Since the signal transmitted by the terminal on the first link is known to the terminal, and the image component transmitted by the terminal on the first link and received by the terminal on the second link can be obtained by the above even harmonic nonlinear image interference signal model, only the obtained image component includes the unknown second parameter, so that the second parameter corresponding to the above even harmonic nonlinear image interference signal model in a specific frequency range can be estimated by transmitting the signal on the first link one or more times. Of course, in the embodiment of the present invention, the second parameter of the even harmonic nonlinear image interference signal model corresponding to the specific frequency range may also be a second parameter obtained and configured in advance, because when the interference performance of the terminal and the specific frequency range are fixed, then the second parameter of the even harmonic nonlinear image interference signal model corresponding to the specific frequency range may also be fixed. Thus, in some embodiments, the parameter may be measured or estimated in advance, or the second parameter may be measured or estimated at one terminal and then applied to other terminals at the same terminal.

In this embodiment, the second parameter is estimated, and the second baseband signal is reconstructed based on the even harmonic nonlinear image interference signal model and the second parameter to obtain the image interference signal, so that the removed image interference signal can be more accurate, and the interference removal performance of the terminal can be further improved.

Optionally, the determining a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range includes:

and estimating a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range by using an image component of a pilot signal received by the terminal on the second link, wherein the pilot signal is a pilot signal transmitted by the terminal on the first link.

The image component may be an image component received by the terminal on the second link when the terminal transmits the pilot signal on the first link.

It should be noted that, since the pilot signal is transmitted by the terminal and is known to the terminal, and the image component is received by the terminal, it is also known to the terminal, and the relationship between the transmitted pilot signal and the received image component can be represented by a specific non-linear model or the even harmonic non-linear image interference signal model, and the parameters of the specific non-linear model are the same as those of the even harmonic non-linear image interference signal model. Only in the specific non-linear model or the even harmonic non-linear image interference signal model, different parameters may exist for different frequencies, so that in this embodiment, the second parameter corresponding to the specific non-linear model or the even harmonic non-linear image interference signal model in the specific frequency range may be estimated through the image component.

The following describes, in a preferred embodiment, the estimation of the second parameter:

the estimating, by using the image component of the pilot signal received by the terminal in the second link, a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range may include:

receiving an image component signal of the pilot signal to obtain an image component, wherein a relationship between the image component and the pilot signal is a nonlinear relationship represented by a second nonlinear model, and a parameter of the second nonlinear model is an unknown parameter;

estimating parameters of the second nonlinear model using the mirror image component and the pilot signal, wherein the parameters of the second nonlinear model are the same as the second parameters.

The second nonlinear model may be configured in advance by the terminal, or defined in advance in a protocol, or configured in advance by the network side to the terminal, which is not limited in this respect.

In this embodiment, the terminal may transmit the pilot signal through the transmitter of the first link, for example: the pilot signal may be transmitted once, multiple times, or periodically. Thus, the terminal receives the pilot signal, and can obtain an image component.

Since the relationship between the pilot signal transmitted by the terminal and the received image component can be represented by the second non-linear model, it can also be understood that the even harmonic non-linear component can be derived by the second non-linear model, but the image component includes the unknown first parameter, so that the first parameter can be estimated by the image component actually received by the terminal.

In this embodiment, the second parameter is estimated by the second nonlinear model, so that the estimated second parameter can be more accurate and the calculation amount can be reduced.

Assuming that the ideal received signal spectrum can be X (f), the received baseband signal spectrum under IQ imbalance is:

X(f)＝K ₁ X(f-f _c )+K ₂ X ^* (f _c -f) (7)

wherein f is _c For frequency offset, K ₁ Amplitude of the positive frequency component, K ₂ Is the amplitude of the image component, wherein the foregoing denotes the conjugate, so that the image component of the baseband signal is symmetrical to the conjugate of the original baseband signal.

The image component of the pilot signal can be expressed as:

s ^- ＝A(cosω _-1 t+cosω _-2 t) (8)

wherein, ω is _-1 And ω _-2 Two frequency points used by the dual-frequency image component signal are shown, and A represents the signal amplitude.

For example: taking the second nonlinear model as a power series model for example, the image component of the received pilot signal in a specific frequency range is represented as:

wherein, is equal to y on the right _2ω Represents a mirror component, wherein a ₂ 、a ₄ And a ₆ H (ω) represents a phase rotation of the channel between the transmitter of the terminal and the receiver of the terminal at ω frequency for the parameters corresponding to the second nonlinear model at the specific frequency range. For example: the phase rotation of the frequency component in the received second harmonic is taken as the phase rotation h (ω) of the channel.

Note that the pilot signal has been substituted into the second nonlinear model in the above formula, that is, ω is the above ₁ 、ω ₂ And h (ω) is a variable, the formula can be understood as the above-mentioned secondTwo non-linear models.

For the first parameter estimation of the even harmonic nonlinear mirror interference signal model, reference may be made to the parameter estimation of the above formula 2, which is not described herein again.

It should be noted that, here, only the dual-frequency signal is taken as an example, and in this embodiment, the pilot signal may also be a complex signal. And the interference signal model shown in equation 4 may also be used as the second non-linear model. Or may be represented by the formula g (x) = a ₁ x ¹ +a ₂ x ² +a ₃ x3+a ₄ x ⁴ +...+a _n x ⁿ Other non-linear models are determined.

Optionally, the reconstructing a second baseband signal based on the even harmonic nonlinear image interference signal model and the second parameter to obtain the image interference signal includes:

acquiring the second baseband signal, wherein the second baseband signal is a time domain baseband signal or a frequency domain baseband signal;

and under the condition that the second baseband signal is used as a variable of the even harmonic nonlinear image interference signal model and the parameter is the second parameter, acquiring a nonlinear component corresponding to the even harmonic nonlinear image interference signal model, wherein the nonlinear component is the image interference signal.

For example: after the second parameter of the even harmonic nonlinear image interference signal model is determined, the baseband signal transmitted by the transmitter may be transmitted to the receiver for reconstruction. The baseband signal used for reconstructing (or called as: reconstructing) the mirror image component is the mirror image component of the baseband signal transmitted by the terminal on the first link, that is, the base station signal is conjugate symmetric with the original baseband signal (the baseband signal transmitted by the terminal on the first link) about the zero point in the frequency domain. The image component of the transmitted signal at this time can be expressed as:

x ^- (t)＝Acosωt+Bsinωt (10)

where A and B are the real and imaginary parts of the OFDM time domain signal, and ω is the transmit frequency. Thus, for the image component, the nonlinear component of the interference signal in the above-mentioned specific frequency range is expressed as:

that is, the above formula is understood as the above even harmonic nonlinear image interference signal model, wherein a is ₂ 、a ₄ And a ₆ And h (omega) represents the phase rotation of the channel between the transmitter of the terminal and the receiver of the terminal on the omega frequency for the second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range.

And substituting the second baseband signal into the even harmonic nonlinear image interference signal model to obtain a reconstructed image interference signal represented by the formula, thereby realizing the removal of image interference.

It should be noted that, the above is only exemplified by time domain reconstruction, and the frequency domain reconstruction may be to bring the frequency domain baseband signal into an even harmonic nonlinear image interference signal model with determined parameters to obtain an even harmonic interference signal reconstructed in the frequency domain.

In addition, in the embodiment of the present invention, the even harmonic nonlinear image interference signal model is not limited to the above formula, for example: the first parameter of the above equation 11 includes a ₂ 、a ₄ And a ₆ And in some other embodiments may include only a ₂ And a ₄ And the even harmonic nonlinear interference signal model corresponding to the even harmonic component corresponding to the two parameters. Or in order to further improve the accuracy of the interference signal, a can be added on the basis of the formula 6 ₈ And a ₁₀ Corresponding image components to improve the accuracy of the interference signal.

In an optional embodiment, the even harmonic nonlinear interference signal model is a coupled interference signal model, and the coupled interference signal model includes: the non-linear component of even harmonic wave under the condition of no influence of DC bias and the non-linear component of DC bias influence DC;

reconstructing a first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter to obtain an even harmonic interference signal, including:

reconstructing a first baseband signal based on the coupled interference signal model and the first parameter to obtain an even harmonic interference signal and a direct-current component interference signal, wherein the first baseband signal is a baseband signal which is transmitted by the terminal on the first link and is mixed with a direct-current component;

the removing the even harmonic interference signal in the received signal includes:

and removing the even harmonic interference signal and the direct current component interference signal in the received signal.

The above coupled interference signal model may be configured in advance by the terminal, or defined in advance in a protocol, or configured in advance by the network side, for example: a power series model or a nonlinear model, etc., which are not limited to the embodiments of the present invention, and the following formula can be specifically used for description.

In this embodiment, even harmonic interference and dc component interference can be removed when the transmitted signal is mixed with a dc component under the influence of actual circuit nonlinearity, and an odd harmonic frequency component is generated in the above-mentioned specific frequency range, thereby affecting demodulation of the received signal.

Here, taking the OFDM signal transmitted by the terminal as the first baseband signal for example, it may be represented as a' = d _a + A and B' = d _b + B, A and B are the real and imaginary parts of the OFDM time domain signal, d _a And d _b For the dc component, for example: d _a Is much smaller than B and d _b And also much smaller than B, the received signal in the above-mentioned specific frequency range is:

i.e. the above formula is to be understood as the above couplingInterference signal model, wherein a above ₂ 、a ₄ And a ₆ For the first parameter corresponding to the coupled interference signal model in the specific frequency range, h (ω) represents a phase rotation of the channel between the transmitter of the terminal and the receiver of the terminal at ω frequency.

Wherein y (t) is the non-linear component of the even harmonic in the specific frequency range without the influence of the dc offset, i.e. the even harmonic interference signal. That is, y (t) may be equal to y in equation 6 _2ω . For the y (t) reconstruction method and the interference cancellation method, reference may be made to the above-described even harmonic interference removal implementation, which is not described herein again. The latter two terms in equation 12 are dc nonlinear components, i.e., dc component interference signals, caused by the dc component passing through the nonlinear model and the linear channel.

Optionally, the determining a first parameter corresponding to the even harmonic nonlinear interference signal model in a specific frequency range includes:

and using the direct current component of the pilot signal received by the terminal in the second link to couple an interference signal, and estimating the first parameter corresponding to the coupled interference signal model in the specific frequency range.

The dc component coupled interference signal may be a signal component received by the terminal in the second link when the terminal transmits the pilot signal in the first link.

It should be noted that, since the pilot signal is transmitted by the terminal and is known to the terminal, and the dc component coupling interference signal is received by the terminal, it is also known to the terminal, and the relationship between the transmitted pilot signal and the received dc component coupling interference signal can be represented by a specific non-linear model or the coupling interference signal model, and the parameters of the specific non-linear model are the same as the parameters of the coupling interference signal model. Only in the specific non-linear model or the coupled interference signal model, different parameters may exist for different frequencies, so that in this embodiment, the first parameter corresponding to the specific non-linear model or the coupled interference signal model in the specific frequency range may be estimated by the above-mentioned dc component coupled interference signal.

the coupling, by using the dc component of the pilot signal received by the terminal in the second link, an interference signal, and estimating the first parameter corresponding to the coupled interference signal model in the specific frequency range may include:

receiving the pilot signal to obtain the direct current component coupling interference signal, wherein a relationship between the direct current component coupling interference signal and the pilot signal is a nonlinear relationship represented by a third nonlinear model, and a parameter of the third nonlinear model is an unknown parameter;

and estimating parameters of the third nonlinear model by using the direct current component coupled interference signal and the pilot signal, wherein the parameters of the third nonlinear model are the same as the first parameters.

The third nonlinear model may be configured in advance by the terminal, or defined in advance in a protocol, or configured in advance by the network side to the terminal, which is not limited in this respect.

In this embodiment, the terminal may transmit the pilot signal through the transmitter of the first link, for example: the pilot signal may be transmitted once, multiple times, or periodically. Therefore, the terminal receives the pilot signal and can obtain a direct current component coupling interference signal.

Since the relationship between the pilot signal transmitted by the terminal and the received dc component coupled interference signal can be represented by the third nonlinear model, it can also be understood that the dc component coupled interference signal can be derived by the third nonlinear model, but the dc component coupled interference signal includes an unknown first parameter, so that the first parameter can be estimated by the dc component coupled interference signal actually received by the terminal.

A pilot signal design method may be to select two frequency points within the above specific step range, and modulate the pilot signal to be a dual-frequency signal using the selected frequency points, where the dual-frequency signal may be represented as:

A＝cosω ₁ t+cosω ₂ t，B＝sinω ₁ t+sinω ₂ t (13)

for example: the third nonlinear model is a power series model, only the main component is considered, and the coupling interference signal of the direct current component mixed with the direct current offset of the transmitter in the specific frequency range is expressed as:

wherein, is equal to y on the right _2ω Represents the dc component coupling interference signal, where y (t) is the even harmonic nonlinear component in the specific frequency range without the influence of dc offset, i.e. the even harmonic nonlinear component. That is, y (t) may be equal to y in equations 2 and 4 _2ω . The first parameter in y (t) may refer to the embodiments of equation 2 and equation 4 for estimating the first parameter, which are not described herein again.

Equation 14 represents a third nonlinear model using a power series model, but this is not limited, because only the main components are considered in equation 14, such as: to remove the dc component interference more accurately, more components may be added, for example: a is ₄ And a ₆ Corresponding components, etc. Wherein exp () represents an exponential function with a natural constant e as a base.

By equation 14 can be found at ω ₁ ,ω ₂ Receiving the DC component coupling interference signal at the frequency point, and estimating the DC by least square or least mean square error methodComponent d _a And d _b 。

Optionally, the reconstructing the first baseband signal based on the coupled interference signal model and the first parameter to obtain an even harmonic interference signal and a dc component interference signal includes:

and under the condition that the first baseband signal is used as a variable of the coupled interference signal model and the parameter is the first parameter, acquiring a nonlinear component corresponding to the coupled interference signal model, wherein the nonlinear component is the even harmonic interference signal and the direct current component interference signal.

In this embodiment, the interfering baseband signal transmitted by the transmitter may be transmitted to the receiver, and then the baseband signal may be reconstructed by using equation 12 to obtain the even harmonic interference signal and the dc component interference signal, for example: the baseband signal is substituted into equation 12 to obtain the even harmonic interference signal and the dc component interference signal.

In this embodiment, even harmonic interference signals and the dc component interference signals may be removed to reduce interference of the terminal.

In this embodiment, various optional implementation manners are added on the basis of the embodiment shown in fig. 2, and even harmonic interference signals, image interference signals, and direct-current component interference signals can be removed, so as to improve the terminal interference cancellation performance.

Referring to fig. 4, fig. 4 is a flowchart of an interference signal processing method according to an embodiment of the present invention, where the method is applied to a terminal, and as shown in fig. 4, the method includes the following steps:

step 401, determining a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range, where the specific frequency range is a frequency range in which the signal of the first link generates an even harmonic interference signal at a double frequency, and the double frequency is a double frequency of the carrier frequency of the first link;

step 402, reconstructing a second baseband signal based on the even harmonic nonlinear image interference signal model and the second parameter to obtain an image interference signal, wherein the second baseband signal is an image component of a baseband signal transmitted by the terminal on a first link;

step 403, removing the image interference signal from a received signal, where the received signal is a received signal of the terminal in the specific frequency range of the second link.

It should be noted that, in this embodiment, embodiments of obtaining the second parameter and reconstructing the image disturbing signal and the like may refer to the embodiment shown in fig. 3, which are not described herein again, and the same beneficial effects may be achieved.

Referring to fig. 5, fig. 5 is a schematic diagram of another interference signal processing method according to an embodiment of the present invention, and as shown in fig. 5, even harmonic interference signals, image interference signals, and direct current component interference signals can be removed.

In this embodiment, a power series method is used for modeling even harmonic nonlinear interference signals, and parameters in the model are estimated by transmitting pilot signals. And secondly, transmitting the baseband signal transmitted by the interference transmitter to a receiver, and substituting the baseband signal into a nonlinear interference signal model to calculate to obtain a reconstructed interference signal. And finally, subtracting the reconstructed interference signal from the received signal to complete the elimination of the nonlinear interference.

In this embodiment, the pilot sequence is selected as a dual-frequency signal, the baseband signal is an OFDM signal, and digital modulation is performed on each subcarrier. In addition, in order to ensure that the nonlinear model parameters estimated by the pilot frequency are as close as possible to the nonlinear model parameters of the signal, the maximum modulus value of the pilot frequency is designed to be equal to the maximum modulus value of the signal. The dual-band signal and the baseband signal are digitally modulated and then passed through a digital-to-analog conversion module (DAC) for up-conversion (e.g., f as shown in FIG. 5) ₁ ) Then, the signal is transmitted from a transmitting antenna, and after linear channel transmission, down-converted at a receiving end (for example: as shown in fig. 5 f ₂ ) Andanalog to digital conversion (ADC).

Wherein, the signal at the receiving frequency point completes the parameter estimation of the even harmonic nonlinear model through the even harmonic parameter estimation module:

wherein, the estimation module comprises two steps: firstly, the least square method is adopted to carry out the treatment on a in the formula (2) ₂ ,a ₄ ,a ₆ And (6) estimating. Second, the second harmonic omega is received ₁ +ω ₂ The phase rotation of the intermediate frequency component is taken as the phase rotation h (ω) of the channel. And then, directly transmitting the transmitted OFDM baseband signal to an even harmonic interference reconstruction module, and reconstructing an even harmonic interference signal according to a formula (5) by combining channel parameters output by a pilot parameter estimation module. Finally, the reconstructed even harmonic interference signal is subtracted from the received signal, and then the interference elimination can be completed.

Consider the case where the system has IQ path imbalance: sending the pilot signal and baseband signal after digital modulation into a mirror component parameter estimation module, and receiving a frequency point omega by the pilot mirror component _-1 And omega _-2 The received signal adopts a least square method to complete the nonlinear model parameter a _-2 ,a _-4 ,a _-6 Is estimated. And receiving the second harmonic omega _-1 +ω _-2 The phase of the intermediate frequency component is rotated as the phase rotation h' (ω) of the channel. And then, transmitting the baseband signal transmitted by the transmitter to a mirror image component interference reconstruction module, taking a signal of the original baseband signal which is conjugate and symmetrical about a zero point on a frequency domain as a baseband signal of the mirror image component in an IQ path unbalanced state, completing reconstruction of the mirror image component according to a formula (11), and eliminating the reconstructed signal at a receiving end through a subtracter.

Consider the case where the system has dc bias: and sending the pilot signal and the baseband signal after digital modulation into a direct current component parameter estimation module, and performing parameter estimation on a direct current component interference signal model by adopting a least square method. And then, transmitting the baseband signal transmitted by the transmitter to a direct current component reconstruction module, and combining the parameters obtained from the parameter estimation module to complete the interference reconstruction of the direct current component. And is cancelled at the receiving end by a subtractor.

In this embodiment, whether to eliminate the interference of the dc component and the image component may be selected according to actual conditions. For example: whether the interference of the dc component and the image component is eliminated can be controlled by two switches in fig. 5.

Referring to fig. 6, fig. 6 is a structural diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 6, a terminal 600 includes:

a first determining module 601, configured to determine a first parameter corresponding to an even harmonic nonlinear interference signal model in a specific frequency range, where the specific frequency range is a frequency range in which a signal of a first link generates an even harmonic interference signal at a double frequency, and the double frequency is a double frequency of a carrier frequency of the first link;

a first reconstructing module 602, configured to reconstruct a first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter, to obtain an even harmonic interference signal, where the first baseband signal is a baseband signal transmitted by the terminal on a first link;

a first removing module 603, configured to remove the even harmonic interference signal from a received signal, where the received signal is a received signal of the terminal in the specific frequency range of the second link.

Optionally, the first determining module 601 is configured to estimate a first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range by using an even harmonic nonlinear component of a pilot signal received by the terminal in the second link, where the pilot signal is a pilot signal transmitted by the terminal in the first link.

Optionally, as shown in fig. 7, the first determining module 601 includes:

a first receiving unit 6011 is configured to receive the pilot signal to obtain the even harmonic nonlinear component, where a relationship between the even harmonic nonlinear component and the pilot signal is a nonlinear relationship expressed by a first nonlinear model, and a parameter of the first nonlinear model is an unknown parameter;

a first estimating unit 6012 is configured to estimate parameters of the first nonlinear model by using the even harmonic nonlinear component and the pilot signal, where the parameters of the first nonlinear model are the same as the first parameters.

Optionally, as shown in fig. 8, the first reconstruction module 602 includes:

a first obtaining unit 6021, configured to obtain the first baseband signal, where the first baseband signal is a time domain baseband signal or a frequency domain baseband signal;

a first reconstructing unit 6022, configured to obtain a nonlinear component corresponding to the even harmonic nonlinear baseband signal model when the first baseband signal is used as a variable of the even harmonic nonlinear baseband signal model and a parameter is the first parameter, where the nonlinear component is the even harmonic interference signal.

Optionally, as shown in fig. 9, the terminal 600 further includes:

a second re-modeling block 604 for re-establishing an image interference signal of the first link with respect to the second link;

a second removing module 605, configured to remove the image interference signal from the received signal.

Optionally, as shown in fig. 10, the terminal 600 further includes:

a second determining module 606, configured to determine a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range;

the second reconstructing module 604 is configured to reconstruct a second baseband signal based on the even harmonic nonlinear image interference signal model and the second parameter to obtain the image interference signal, where the second baseband signal is an image component of a baseband signal transmitted by the terminal on the first link.

Optionally, the second determining module 606 is configured to estimate a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range by using an image component of a pilot signal received by the terminal in the second link, where the pilot signal is a pilot signal transmitted by the terminal in the first link.

Optionally, as shown in fig. 11, the second determining module 606 includes:

a second receiving unit 6061, configured to receive an image component signal of the pilot signal, so as to obtain an image component, where a relationship between the image component and the pilot signal is a nonlinear relationship represented by a second nonlinear model, where a parameter of the second nonlinear model is an unknown parameter;

a second estimating unit 6062 for estimating parameters of the second nonlinear model using the mirror component and the pilot signal, wherein the parameters of the second nonlinear model are the same as the second parameters.

Optionally, as shown in fig. 12, the second reconstruction module 604 includes:

a second obtaining unit 6041, configured to obtain the second baseband signal, where the second baseband signal is a time-domain baseband signal or a frequency-domain baseband signal;

a second reconstructing unit 6042, configured to, when the second baseband signal is used as a variable of the even harmonic nonlinear image interference signal model and the parameter is the second parameter, obtain a nonlinear component corresponding to the even harmonic nonlinear image interference signal model, where the nonlinear component is the image interference signal.

Optionally, the even harmonic nonlinear interference signal model is a coupling interference signal model, and the coupling interference signal model includes: the non-linear component of even harmonic wave under the condition of no influence of DC bias and the non-linear component of DC bias influence DC;

the first reconstruction module 602 is configured to reconstruct a first baseband signal based on the coupled interference signal model and the first parameter, to obtain an even harmonic interference signal and a dc component interference signal, where the first baseband signal is a baseband signal that is transmitted by the terminal on the first link and mixed with a dc component;

the first removing module 603 is configured to remove the even harmonic interference signal and the dc component interference signal from the received signal.

Optionally, the first determining module 601 is configured to estimate the first parameter corresponding to the coupled interference signal model in the specific frequency range by using a direct current component coupled interference signal of the pilot signal received by the terminal in the second link.

Optionally, as shown in fig. 13, the first determining module 601 includes:

a third receiving unit 6013, configured to receive the pilot signal to obtain the dc component coupled interference signal, where a relationship between the dc component coupled interference signal and the pilot signal is a nonlinear relationship represented by a third nonlinear model, where a parameter of the third nonlinear model is an unknown parameter;

a third estimating unit 6014, configured to estimate parameters of the third nonlinear model by using the dc component coupled with the interference signal and the pilot signal, where the parameters of the third nonlinear model are the same as the first parameters.

Optionally, as shown in fig. 14, the first reconstruction module 602 includes:

a third obtaining unit 6023, configured to obtain the first baseband signal, where the first baseband signal is a time-domain baseband signal or a frequency-domain baseband signal;

a third reconstructing unit 6024, configured to obtain a nonlinear component corresponding to the coupled interference signal model when the first baseband signal is used as a variable of the coupled interference signal model and a parameter is the first parameter, where the nonlinear component is the even harmonic interference signal and the dc component interference signal.

Optionally, the pilot signal is a dual-frequency signal located in the specific frequency range. Of course, in this embodiment, the pilot signal is not limited, for example: any complex signal (alternatively referred to as a complex pilot signal) may be used.

The terminal provided by the embodiment of the present invention can implement each process implemented by the terminal in the method embodiments of fig. 2 to fig. 5, and for avoiding repetition, details are not described here, and interference of the terminal can be reduced.

Figure 15 is a schematic diagram of the hardware architecture of a terminal implementing various embodiments of the invention,

the terminal 1500 includes, but is not limited to: a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, a processor 1510, and a power supply 1511. Those skilled in the art will appreciate that the terminal configuration shown in fig. 15 is not intended to be limiting, and that the terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

A processor 1510 configured to determine a first parameter corresponding to an even harmonic nonlinear interference signal model in a specific frequency range, wherein the specific frequency range is a frequency range in which a signal of a first link generates an even harmonic interference signal at a double frequency, and the double frequency is a double frequency of a carrier frequency of the first link;

Optionally, the determining, performed by the processor 1510, a first parameter corresponding to the even harmonic nonlinear interference signal model in a specific frequency range includes:

Optionally, the estimating, by the processor 1510, a first parameter corresponding to the even harmonic nonlinear interference signal model in the specific frequency range by using an even harmonic nonlinear component of a pilot signal received by the terminal in the second link includes:

receiving the pilot signal to obtain the even harmonic nonlinear component, wherein the relationship between the even harmonic nonlinear component and the pilot signal is a nonlinear relationship represented by a first nonlinear model, and parameters of the first nonlinear model are unknown parameters;

estimating parameters of the first nonlinear model using the even harmonic nonlinear component and the pilot signal, wherein the parameters of the first nonlinear model are the same as the first parameters.

Optionally, the reconstructing, performed by the processor 1510 based on the even harmonic nonlinear interference signal model and the first parameter, the first baseband signal to obtain an even harmonic interference signal includes:

Optionally, the processor 1510 is further configured to:

reconstructing an image interference signal of the first link relative to the second link;

and removing the image interference signal in the received signal.

Optionally, the processor 1510 is further configured to:

the reconstructing of the image interference signal of the first link relative to the second link performed by processor 1510 includes:

Optionally, the determining, performed by the processor 1510, a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range includes:

Optionally, the estimating, by the processor 1510, a second parameter corresponding to the even harmonic nonlinear image interference signal model in the specific frequency range by using an image component of a pilot signal received by the terminal in the second link includes:

Optionally, the reconstructing, performed by the processor 1510, a second baseband signal based on the even harmonic nonlinear image interference signal model and the second parameter to obtain the image interference signal includes:

the reconstructing the first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter performed by the processor 1510 to obtain an even harmonic interference signal includes:

the removing of the even harmonic interference signals in the received signal performed by processor 1510 comprises:

Optionally, the determining, by the processor 1510, a first parameter corresponding to the even harmonic nonlinear interference signal model in a specific frequency range includes:

Optionally, the step of the processor 1510 coupling an interference signal using a direct current component of a pilot signal received by the terminal on the second link, and estimating the first parameter corresponding to the coupled interference signal model in the specific frequency range includes:

Optionally, the reconstructing the first baseband signal based on the coupled interference signal model and the first parameter by the processor 1510 to obtain an even harmonic interference signal and a dc component interference signal includes:

The terminal can reduce interference.

It should be understood that, in the embodiment of the present invention, the rf unit 1501 may be configured to receive and transmit signals during a message transmission or a call, and specifically, receive downlink data from a base station and then process the received downlink data to the processor 1510; in addition, the uplink data is transmitted to the base station. In general, the radio frequency unit 1501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Further, the radio frequency unit 1501 may also communicate with a network and other devices through a wireless communication system.

The terminal provides wireless broadband internet access to the user through the network module 1502, such as assisting the user in sending and receiving e-mails, browsing web pages, and accessing streaming media.

The audio output unit 1503 may convert audio data received by the radio frequency unit 1501 or the network module 1502 or stored in the memory 1509 into an audio signal and output as sound. Also, the audio output unit 1503 may provide audio output (e.g., a call signal reception sound, a message reception sound, etc.) related to a specific function performed by the terminal 1500. The audio output unit 1503 includes a speaker, a buzzer, a receiver, and the like.

The input unit 1504 is used to receive audio or video signals. The input Unit 1504 may include a Graphics Processing Unit (GPU) 15041 and a microphone 15042, and the Graphics processor 15041 processes image data of still pictures or videos obtained by an image capturing apparatus (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 1506. The image frames processed by the graphic processor 15041 may be stored in the memory 1509 (or other storage medium) or transmitted via the radio frequency unit 1501 or the network module 1502. The microphone 15042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 1501 in case of the phone call mode.

Terminal 1500 also includes at least one sensor 1505, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 15061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 15061 and/or a backlight when the terminal 1500 moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer and tapping), and the like; sensors 1505 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 1506 is used to display information input by the user or information provided to the user. The Display unit 1506 may include a Display panel 15061, and the Display panel 15061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 1507 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 1507 includes a touch panel 15071 and other input devices 15072. The touch panel 15071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 15071 (e.g., operations by a user on or near the touch panel 15071 using a finger, a stylus, or any suitable object or accessory). The touch panel 15071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, and sends the touch point coordinates to the processor 1510 to receive and execute commands sent by the processor 1510. In addition, the touch panel 15071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The user input unit 1507 may include other input devices 15072 in addition to the touch panel 15071. In particular, other input devices 15072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

Further, a touch panel 15071 may be overlaid on the display panel 15061, and when the touch panel 15071 detects a touch operation thereon or nearby, the touch panel is transmitted to the processor 1510 to determine the type of the touch event, and then the processor 1510 provides a corresponding visual output on the display panel 15061 according to the type of the touch event. Although in fig. 15, the touch panel 15071 and the display panel 15061 are two independent components to implement the input and output functions of the terminal, in some embodiments, the touch panel 15071 and the display panel 15061 may be integrated to implement the input and output functions of the terminal, which is not limited herein.

An interface unit 1508 is an interface for connecting an external device to the terminal 1500. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 1508 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 1500 or may be used to transmit data between the terminal 1500 and an external device.

The memory 1509 may be used to store software programs as well as various data. The memory 1509 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 1509 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 1510 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by running or executing software programs and/or modules stored in the memory 1509 and calling data stored in the memory 1509, thereby monitoring the entire terminal. Processor 1510 may include one or more processing units; preferably, the processor 1510 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 1510.

The terminal 1500 may also include a power supply 1511 (such as a battery) for powering the various components, and preferably, the power supply 1511 is logically coupled to the processor 1510 via a power management system that provides functionality for managing charging, discharging, and power consumption.

In addition, the terminal 1500 includes some functional modules that are not shown, and are not described in detail herein.

Preferably, an embodiment of the present invention further provides a terminal, including a processor 1510, a memory 1509, and a computer program stored in the memory 1509 and capable of running on the processor 1510, where the computer program, when executed by the processor 1510, implements each process of the foregoing interference signal processing method embodiment, and can achieve the same technical effect, and details are not repeated here to avoid repetition.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the interference signal processing method embodiment provided in the embodiment of the present invention, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An interference signal processing method applied to a terminal is characterized by comprising the following steps:

2. The method of claim 1, wherein determining a first parameter corresponding to the even harmonic nonlinear interference signal model at a particular frequency range comprises:

3. The method of claim 2, wherein estimating the first parameter corresponding to the even harmonic nonlinear interference signal model at the particular frequency range using the even harmonic nonlinear component of the pilot signal received by the terminal at the second link comprises:

4. The method according to any of claims 1 to 3, wherein said reconstructing the first baseband signal based on the even harmonic nonlinear interference signal model and the first parameter to obtain an even harmonic interference signal comprises:

5. The method of claim 1, wherein the method further comprises:

and removing the image interference signal in the received signal.

6. The method of claim 5, wherein the method further comprises:

7. The method of claim 6, wherein determining a second parameter corresponding to the even harmonic nonlinear image interference signal model at the particular frequency range comprises:

8. The method of claim 7, wherein estimating second parameters of the even harmonic nonlinear image interference signal model corresponding to the particular frequency range using an image component of a pilot signal received by the terminal on the second link comprises:

estimating parameters of the second non-linear model using the image component and the pilot signal, wherein the parameters of the second non-linear model are the same as the second parameters.

9. The method according to any one of claims 6 to 8, wherein reconstructing the second baseband signal based on the even harmonic nonlinear image interference signal model and the second parameter to obtain the image interference signal comprises:

10. The method of claim 1, wherein the even harmonic nonlinear interferer model is a coupled interferer model, the coupled interferer model comprising: the non-linear component of even harmonic wave under the condition of no influence of DC bias and the non-linear component of DC bias influence DC;

11. The method of claim 10, wherein determining a first parameter corresponding to the even harmonic nonlinear interference signal model at a particular frequency range comprises:

12. The method as claimed in claim 11, wherein said estimating the first parameter corresponding to the coupled interference signal model in the specific frequency range by using the dc component coupled interference signal of the pilot signal received by the terminal in the second link comprises:

13. The method according to any of claims 10 to 12, wherein the reconstructing the first baseband signal based on the coupled interference signal model and the first parameter to obtain an even harmonic interference signal and a dc component interference signal comprises:

14. The method of claim 2, 3, 7, 8, 11 or 12, wherein the pilot signal is a dual frequency signal located in the specific frequency range.

15. A terminal, comprising:

16. A terminal, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps in the interference signal processing method according to any one of claims 1 to 14.

17. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the interference signal processing method according to any one of claims 1 to 14.