Patent Description:
To improve the linearity of a radio frequency power amplifier (Power Amplifier, PA), the linearization technology is usually used. At present, the linearization technology is mainly implemented through the DPD technology. The DPD technology can improve the linearity of a PA, optimize radio frequency performance, and reduce radio frequency power consumption.

A feedback mechanism needs to be introduced in the DPD technology, that is, output signals of the PA are sampled to correct a DPD coefficient. However, when an antenna is close to a face or is held by a user, the performance of the antenna deteriorates, resulting in distortion of sampled signals and low DPD calibration accuracy. As a result, this causes a series of problems such as increase of radio frequency power consumption. However, the related art has no corresponding solution to the problem of low DPD calibration accuracy.

D1 (<CIT>) discloses that an integrated circuit radio transceiver and method therefor includes an integrated circuit radio transceiver operable to provide specified gain levels and transmit path filter responses to correspond with a selected power spectral density mask. Changes in gain may be provided solely digital gain changes or may include analog gain module gain changes. A transmitter selects from one of at least three masks to reduce or eliminate spectral regrowth out of band to satisfy EVM requirements. Circuitry is provided to allow a transceiver to determine in advance what pre-distortion compensation settings are required for the various gain settings.

D2 (<CIT>) discloses that a method for digital pre-distortion for a power amplifier system. The method includes determining one or more system characteristics for the power amplifier system comprising at least a power amplifier that produces output with non-linear distortions, with the one or more system characteristics corresponding, based on the one or more system characteristics corresponding to the estimate for the complex load metric, digital pre-distortion coefficients to compensate for the nonlinear behavior of the power amplifier system.

Embodiments of the present invention provide a digital pre-distortion processing method and an electronic device, to solve the problem of low DPD calibration accuracy.

To resolve the foregoing technical problem, the embodiments of the present invention are implemented as follows:.

Further advantageous embodiments of the present invention are indicated in the dependent claims.

It is to be understood that both the foregoing general description and the following detailed description are exemplary only, and are not restrictive of the present invention.

The accompanying drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and descriptions thereof are used to explain the present invention, and do not constitute any improper limitation on the present invention. In the accompanying drawings:.

The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

As shown in <FIG>, an embodiment of the present invention provides a digital pre-distortion processing method <NUM>. The method may be applied to an electronic device, and includes the following steps.

S <NUM>: Detect a standing wave status of an antenna of the electronic device.

The antenna in the embodiments of the present invention not only may be a Wi-Fi antenna, but also may be an antenna used in mobile network standards such as Long Term Evolution (Long Term Evolution, LTE) or New Radio (New Radio, NR). The Wi-Fi antenna is used as an example below.

The detection of the standing wave status of the antenna of the electronic device in this step may specifically be: detection of an offset between a feedback power of a power amplifier (PA) and a feedback power of the antenna. A specific detection principle is shown in <FIG> below. In <FIG>, an output end of a pre-distortion module is connected to an input end of the PA, and an output end of the PA is connected to the antenna.

The pre-distortion module can be configured to correct a DPD coefficient according to a power of an input sampling signal and a power of a feedback sampling signal (hereinafter abbreviated as a feedback power). The input sampling signal is a signal inputted to the pre-distortion module, and the feedback sampling signal is determined according to an output signal of the PA, for example, can be detected by a detection pin of a coupler. When the standing wave status of the antenna changes, the feedback power of the detection pin changes. Therefore, in this embodiment, the standing wave status of the antenna can be detected by detecting the feedback power of the detection pin.

In a preferred embodiment, the coupler shown in <FIG> is a coupler used in a DPD system, and a feedback power detected by the coupler can also be used to correct a DPD coefficient in subsequent steps. In this embodiment, no additional hardware costs are added to the electronic device. This helps to save resources and reduce the volume of the electronic device.

This embodiment of the present invention shows a specific implementation manner of step S102. Certainly, it should be understood that step S102 can also be implemented in other manners, for example, a distance/light/image sensor detects whether the antenna is held by a user, or detects whether a face approaches the antenna, to determine the standing wave status of the antenna. This is not limited in this embodiment of the present invention.

S104: In a case that the standing wave status of the antenna satisfies a preset working condition, obtain a calibration result through digital pre-distortion calibration.

In this step, if the standing wave status of the antenna satisfies the preset working condition, it indicates that the standing wave status of the antenna is normal. Specifically, a standing wave ratio of the antenna may be less than a threshold.

Optionally, the detection of the standing wave status of the antenna of the electronic device in step S <NUM> is: detection of the offset between the feedback power of the PA and the feedback power of the antenna. In this case, that the standing wave status of the antenna in this step satisfies the preset working conditions includes: the offset between the feedback powers is less than or equal to a preset threshold, that is, a difference (absolute value) between a detected feedback power and a preset feedback power is less than or equal to the preset threshold.

In this embodiment, if the standing wave status of the antenna does not satisfy the preset working condition, for example, the offset between the feedback powers is greater than the preset threshold, that is, a standing wave difference of the antenna, the antenna may be close to a face or may be held by a user with a hand. In this embodiment, DPD calibration can be stopped, to avoid DPD calibration when antenna performance is poor and avoid low DPD calibration accuracy. Certainly, in this embodiment, when DPD calibration is stopped, a DPD function of the electronic device can also be stopped, that is, the pre-distortion module no longer performs DPD processing on an input signal.

In this step, DPD calibration is performed, and the obtained calibration result may specifically be: the calibration succeeds or the calibration fails.

Specifically, in this step, DPD calibration may be performed to obtain a DPD coefficient. If the distortion of the PA is within an acceptable range after the pre-distortion module uses the obtained DPD coefficient to enable the DPD function, it is determined that the DPD calibration succeeds. Otherwise, if the distortion of the PA is not within the acceptable range after the pre-distortion module uses the obtained DPD coefficient to enable the DPD function, it is determined that the DPD calibration fails, and the DPD calibration can be performed again later.

The DPD coefficient can be calculated based on the following models and estimation algorithms: Models include, for example, a memory polynomial model, a Wiener model, a Hammerstein model, or a Volterra model. Estimation algorithms include, for example, the least square method, the least mean square algorithm, or the recursive least square method. The DPD coefficient is used to instruct the pre-distortion module to perform DPD processing on an input signal to obtain a required pre-distorted output signal and input the output signal to the PA, thereby optimizing the linearity of the PA.

S106: Determine whether to enable a digital pre-distortion function according to the calibration result.

As mentioned above, the calibration result includes: the calibration succeeds or the calibration fails. If the digital pre-distortion calibration succeeds, the digital pre-distortion function is enabled. If the digital pre-distortion calibration fails, step S <NUM> of performing digital pre-distortion calibration is performed again.

In the DPD processing method provided in the embodiments of the present invention, the electronic device can detect the standing wave status of the antenna at regular intervals. If the standing wave status meets the preset working condition, that is, when the standing wave of the antenna is normal, the DPD calibration is performed immediately.

In the embodiments of the present invention, in the process of DPD calibration, a feedback signal fed back by the detection pin of the coupler is captured, the distortion of the PA is analyzed in digital domain, and then a signal inputted to the PA is adjusted (that is, pre-distorted), to reduce the physical distortion of the PA to an acceptable level. If the calibration succeeds (that is, the distortion is at an acceptable level), the digital pre-distortion function is enabled; otherwise, DPD calibration is performed again.

In the DPD processing method provided in the embodiments of the present invention, the standing wave status of the antenna is detected, the calibration result is obtained through digital pre-distortion calibration when the standing wave status satisfies the preset working condition, and whether to enable the digital pre-distortion function is determined according to the calibration result.

The embodiments of the present invention can avoid the problem of low DPD calibration accuracy caused because DPD calibration is performed when the standing wave of the antenna is poor, to improve the DPD calibration accuracy, reduce the distortion of the PA, improve the radio frequency performance, and facilitate the optimization of an error vector magnitude (Error Vector Magnitude, EVM) and an adjacent channel power ratio (Adjacent Channel Power Ratio, ACPR) of the PA.

In addition, the embodiments of the present invention may be implemented at preset time intervals, that is, DPD calibration is performed at preset time intervals. Compared with DPD calibration performed only when the PA is started, DPD calibration accuracy can be further improved.

The improvement of the DPD calibration accuracy in the embodiments of this specification may specifically be improvement of the accuracy of the obtained DPD coefficient.

DPD calibration performed when the standing wave of the antenna is poor lead to deterioration of radio frequency performance. If DPD calibration is performed again at regular intervals through the foregoing embodiment <NUM>, the impact of DPD deterioration on radio frequency performance can be largely avoided. However, frequent DPD calibration degrades Wi-Fi performance. This is because a radio frequency link cannot perform normal communication during DPD calibration, and time resources occupied by DPD calibration reduce the throughput of Wi-Fi. Optionally, before digital pre-distortion calibration is performed in S <NUM> of the foregoing embodiment, the following step may be further included: detecting a throughput of wireless-fidelity Wi-Fi of the electronic device. In this case, S104 of the foregoing embodiment may specifically be: obtaining the calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies the preset working condition and the throughput of the Wi-Fi is less than a preset threshold.

In this embodiment, the throughput of the Wi-Fi is fully considered during DPD calibration, and DPD calibration is performed when the throughput of the Wi-Fi is less than the preset threshold, to minimize the impact of DPD calibration on Wi-Fi and improve Wi-Fi communication efficiency.

In practical applications, the electronic device may support Wi-Fi connection in a plurality of bands, that is, a radio frequency module of the electronic device has a plurality of Wi-Fi operating bands, and the obtaining the calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies the preset working condition and the throughput of the Wi-Fi is less than a preset threshold in the foregoing embodiment includes:.

To describe in detail the digital pre-distortion processing method provided in the embodiments of the present invention, several specific embodiments are described below. As shown in <FIG>, the embodiment <NUM> includes the following steps.

S302: Detect a standing wave status of an antenna of an electronic device.

S304: Determine whether the standing wave status of the antenna is normal.

S306: Skip performing DPD calibration and disable a DPD function.

S310: Determine whether DPD calibration succeeds.

S312: Determine whether the number of DPD calibrations is less than the maximum number of calibrations.

The DPD calibration result includes a DPD coefficient. When a PA subsequently operates, a signal inputted to the PA can be pre-distorted according to the DPD coefficient, thereby ensuring the linearity of the PA and reducing the distortion of PA.

The embodiments of the present invention can avoid the problem of low DPD calibration accuracy caused because DPD calibration is performed when an antenna standing wave is poor, to improve the DPD calibration accuracy and reduce the distortion of the PA, improve the radio frequency performance, and facilitate the optimization of an EVM and an ACPR of the PA.

<FIG> is a digital pre-distortion processing method provided in another embodiment of the present invention. As shown in <FIG>, this embodiment <NUM> includes the following steps.

S404: Determine whether a DPD re-calibration cycle is reached.

S406: Detect a throughput of Wi-Fi of the electronic device.

S408: Determine whether the throughput of Wi-Fi is less than a preset threshold.

S410: Detect a standing wave status of an antenna of the electronic device.

Subsequent steps in this embodiment may continue to be performed with reference to S304 to S314 in the foregoing embodiment. To avoid repetition, the description of the foregoing repeated steps are omitted herein.

Optionally, in this embodiment, when the radio frequency module of the electronic device has a plurality of Wi-Fi operating bands (for example, when the electronic device can use <NUM> and <NUM> Wi-Fi at the same time), traffic usage statuses of <NUM> and <NUM> bands can be monitored simultaneously in the background. DPD re-calibration is performed on a band that does not use Wi-Fi traffic.

The digital pre-distortion processing method according to the embodiments of the present invention is described in detail above with reference to <FIG>. The electronic device according to the embodiments of the present invention will be described in detail below with reference to <FIG> is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in <FIG>, the electronic device <NUM> includes:.

In the embodiments of the present invention, the standing wave status of the antenna is detected, in the case that the standing wave status satisfies the preset working condition, the calibration result is obtained through digital pre-distortion calibration, and whether to enable the digital pre-distortion function is determined according to the calibration result. The embodiments of the present invention can avoid the problem of low DPD calibration accuracy caused because DPD calibration is performed when an antenna standing wave is poor, to improve the DPD calibration accuracy and reduce the distortion of the PA.

Optionally, as an embodiment, the electronic device <NUM> further includes: a throughput detection module, configured to detect a throughput of Wi-Fi of the electronic device; and
the pre-distortion module <NUM> is configured: to obtain the calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies the preset working condition and the throughput of the Wi-Fi is less than a first threshold.

Optionally, as an embodiment, a radio frequency module of the terminal device has a plurality of Wi-Fi operating bands, and the pre-distortion module <NUM> is configured to:.

Optionally, as an embodiment, the pre-distortion module <NUM> is configured to:.

Optionally, as an embodiment, the standing wave status detection module <NUM> is configured to: detect an offset between a feedback power of a power amplifier of the electronic device and a feedback power of the antenna; and
in a case that the offset is less than or equal to a second threshold, determine that the standing wave status satisfies the preset working condition.

For the electronic device according to this embodiment of the present invention, refer to the corresponding procedure of the digital pre-distortion processing method according to an embodiment of the present invention, and each unit/module in and the foregoing other operations and/or functions of the electronic device are used to implement the corresponding procedure of the digital pre-distortion processing method, and will no longer be described herein for the purpose of brevity.

<FIG> is a schematic structural diagram of hardware of an electronic device implementing the embodiments of the present invention. The electronic device <NUM> includes but is not limited to: a radio frequency unit <NUM>, a network module <NUM>, an audio output unit <NUM>, an input unit <NUM>, a sensor <NUM>, a display unit <NUM>, a user input unit <NUM>, an interface unit <NUM>, a memory <NUM>, a processor <NUM>, a power supply <NUM>, and other components. A person skilled in the art may understand that the structure of the electronic device shown in <FIG> constitutes no limitation on the electronic device. The electronic device may include more or fewer components than those shown in the figure, or a combination of some components, or an arrangement of different components. In this embodiment of the present invention, the electronic device includes but is not limited to a mobile phone, a tablet computer, a notebook computer, a palmtop computer, an in-vehicle terminal, a wearable device, a pedometer, and the like.

The processor <NUM> is configured to: detect a standing wave status of an antenna of the electronic device; obtain a calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies a preset working condition; and determine whether to enable a digital pre-distortion function according to the calibration result.

In the embodiments of the present invention, the standing wave status of the antenna of the electronic device is detected, in the case that the standing wave status satisfies the preset working condition, the calibration result is obtained through digital pre-distortion calibration, and whether to enable the digital pre-distortion function is determined according to the calibration result. The embodiments of the present invention can avoid the problem of low DPD calibration accuracy caused because DPD calibration is performed when an antenna standing wave is poor, to improve the DPD calibration accuracy and reduce the distortion of the PA.

It should be understood that in this embodiment of the present invention, the radio frequency unit <NUM> may be configured to receive and transmit information, or receive and transmit signals during a call. Specifically, the radio frequency unit receives downlink data from a base station, and transmits the downlink data to the processor <NUM> for processing; and transmits uplink data to the base station. Generally, the radio frequency unit <NUM> includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, and a duplexer. In addition, the radio frequency unit <NUM> may also communicate with a network and other devices through a wireless communication system.

The electronic device provides users with wireless broadband Internet access through the network module <NUM>, for example, helps users receive and send e-mails, browse web pages, and access streaming media.

The audio output unit <NUM> may convert audio data received by the radio frequency unit <NUM> or the network module <NUM> or stored in the memory <NUM> into an audio signal and output the audio signal as a sound. Moreover, the audio output unit <NUM> can further provide audio output related to a specific function performed the electronic device <NUM> (for example, call signal receiving sound and message receiving sound). The audio output unit <NUM> includes a speaker, a buzzer, a telephone receiver, and the like.

The input unit <NUM> is configured to receive audio or radio frequency signals. The input unit <NUM> may include a graphics processing unit (Graphics Processing Unit, GPU) <NUM> and a microphone <NUM>, and the graphics processing unit <NUM> processes image data of a still picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. A processed image frame may be displayed on the display unit <NUM>. The image frame processed by the graphics processing unit <NUM> may be stored in the memory <NUM> (or another storage medium) or sent by using the radio frequency unit <NUM> or the network module <NUM>. The microphone <NUM> may receive sound and can process such sound into audio data. The audio data obtained through processing may be converted, in a telephone call mode, into a format that may be sent to a mobile communication base station via the radio frequency unit <NUM> for output.

The electronic device <NUM> further includes at least one sensor <NUM>, for example, a light sensor, a motion sensor, and another sensor. Specifically, the light sensor includes an ambient light sensor and a proximity sensor. The ambient light sensor may adjust brightness of a display panel <NUM> according to ambient light brightness. The proximity sensor may switch off the display panel <NUM> and/or backlight when the electronic device <NUM> moves close to an ear. As a motion sensor, an accelerometer sensor may detect magnitude of acceleration in various directions (usually three axes), may detect magnitude and the direction of gravity when stationary, may be configured to identify electronic device postures (such as switching between a landscape mode and a portrait mode, related games, and magnetometer posture calibration), may perform functions related to vibration identification (such as a pedometer and a knock), and the like. The sensor <NUM> may further include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, or the like.

The display unit <NUM> is configured to display information entered by the user or information provided for the user. The display unit <NUM> may include a display panel <NUM>, and the display panel <NUM> may be configured in a form of a liquid crystal display (Liquid Crystal Display, LCD), an organic light-emitting diode (Organic Light-Emitting Diode, OLED), or the like.

The user input unit <NUM> may be configured to receive entered number or character information, and generate key signal input related to user settings and function control of the electronic device. Specifically, the user input unit <NUM> includes a touch panel <NUM> and another input device <NUM>. The touch panel <NUM>, also called a touch screen, can collect a touch operation of the user on or near the touch panel <NUM> (for example, an operation performed by the user with any suitable object or accessory such as a finger or a stylus on or near the touch panel <NUM>). The touch panel <NUM> may include two parts: a touch detection apparatus and a touch controller. The touch detection apparatus detects a touch position of the user, detects a signal brought by the touch operation, and transmits the signal to the touch controller. The touch controller receives touch information from the touch detection apparatus, converts the touch information into contact coordinates, and sends the contact coordinates to the processor <NUM>, and can receive and execute a command sent by the processor <NUM>. In addition, the touch panel <NUM> may be implemented by various types such as a resistive type, a capacitive type, an infrared ray type or a surface acoustic wave type. In addition to the touch panel <NUM>, the user input unit <NUM> may further include another input device <NUM>. Specifically, the another input device <NUM> may include but is not limited to: a physical keyboard, a function key (such as a volume control key, a switch key), a trackball, a mouse, and a joystick, which is no longer repeated here.

Further, the touch panel <NUM> may cover the display panel <NUM>. When detecting a touch operation on or near the touch panel <NUM>, the touch panel <NUM> transmits the touch operation to the processor <NUM> to determine a type of a touch event. Then, the processor <NUM> provides corresponding visual output on the display panel <NUM> based on the type of the touch event. Although in <FIG>, the touch panel <NUM> and the display panel <NUM> are configured as two independent components to implement input and output functions of the electronic device, in some embodiments, the touch panel <NUM> and the display panel <NUM> can be integrated to implement the input and output functions of the electronic device. Details are not limited herein.

The interface unit <NUM> is an interface for connecting an external apparatus and the electronic device <NUM>. For example, the external apparatus may include a wired or wireless headset jack, an external power supply (or a battery charger) port, a wired or wireless data port, a storage card port, a port for connecting an apparatus having an identification module, an audio input/output (I/O) port, a video I/O port, a headset jack, or the like. The interface unit <NUM> can be configured to receive input from an external apparatus (for example, data information and power) and transmit the received input to one or more elements in the electronic device <NUM>, or can be configured to transmit data between the electronic device <NUM> and the external apparatus.

The memory <NUM> may be configured to store a software program and various data. The memory <NUM> may mainly include a program storage area and a data storage area. The program storage area may store an operating system, an application required by at least one function (for example, a sound play function or an image display function), and the like. The data storage area may store data (for example, audio data or an address book) or the like created based on use of the mobile phone. In addition, the memory <NUM> may include a high-speed random access memory or a nonvolatile memory, for example, at least one disk storage device, a flash memory, or other volatile solid-state storage devices.

The processor <NUM> is a control center of the electronic device and connects all parts of the electronic device using various interfaces and circuits. By running or executing software programs and/or modules stored in the memory <NUM> and by calling data stored in the memory <NUM>, the processor <NUM> implements various functions of the electronic device and processes data, thus performing overall monitoring on the electronic device. The processor <NUM> may include one or more processing units. Optionally, the processor <NUM> may integrate an application processor and a modem processor. The application processor mainly deals with an operating system, a user interface, an application, and the like. The modem processor mainly deals with wireless communication. It may be understood that the modem processor may not be integrated into the processor <NUM>.

The electronic device <NUM> may further include the power supply <NUM> (such as a battery) supplying power to each component. Preferably, the power supply <NUM> may be logically connected to the processor <NUM> by using a power management system, so as to implement functions such as charging management, discharging management and power consumption management by using the power management system.

In addition, the electronic device <NUM> includes some functional modules not shown.

Preferably, an embodiment of the present invention further provides an electronic device, including a processor <NUM>, a memory <NUM>, and a computer program stored in the memory <NUM> and executable on the processor <NUM>. When the processor <NUM> executes the computer program, the foregoing processes of the method embodiments <NUM> to <NUM> are implemented and a same technical effect can be achieved. To avoid repetition, details are not described herein again.

An embodiment of the present invention further provides a computer readable storage medium. The computer readable storage medium stores a computer program. When the computer program is executed by a processor, the foregoing processes of the method embodiments <NUM> to <NUM> are implemented, and a same technical effect can be achieved. To avoid repetition, details are not described herein again. The computer-readable storage medium may be a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, a compact disc, or the like.

An embodiment of the present invention further provides a computer program product. The computer program product is stored in a nonvolatile storage medium. The program product is configured to be executed by at least one processor to implement the foregoing processes of the method embodiments <NUM> to <NUM>, and a same technical effect can be achieved. To avoid repetition, details are not described herein again.

An embodiment of the present invention further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the foregoing processes of the method embodiments <NUM> to <NUM>, and a same technical effect can be achieved. To avoid repetition, details are not described herein again.

An embodiment of the present invention further provides a digital pre-distortion processing apparatus. The digital pre-distortion processing apparatus is configured to implement the foregoing processes of the method embodiments <NUM> to <NUM>, and a same technical effect can be achieved. To avoid repetition, details are not described herein again.

It should be noted that in this specification, the term "include", "including", or any other variant is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements that are not explicitly listed, or includes elements inherent to such a process, method, article, or apparatus. Without more restrictions, an element defined by the statement "including a. " does not exclude another same element in this process, method, article, or apparatus that includes the element.

Claim 1:
A digital pre-distortion processing method (<NUM>), applied to an electronic device, and comprising:
detecting (S102) a standing wave status of an antenna of the electronic device;
obtaining (S104) a calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies a preset working condition; and
determining (S106) whether to enable a digital pre-distortion function according to the calibration result; characterized in that
before the obtaining (S104) a calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies a preset working condition, the method further comprises:
detecting a throughput of wireless-fidelity Wi-Fi of the electronic device; and
the obtaining (S104) a calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies a preset working condition comprises:
obtaining the calibration result through digital pre-distortion calibration in a case that the standing wave status satisfies the preset working condition and the throughput of the Wi-Fi is less than a first threshold.