Abstract: Described examples provide for digital communication circuits and systems that implement digital pre-distortion (DPD). In an example, a system includes a DPD circuit configured to compensate an input signal for distortions resulting from an amplifier. The DPD circuit includes an infinite impulse response (IIR) filter configured to implement a transfer function. The IIR filter includes a selection circuit configured to selectively output a selected parameter. The transfer function is based on the selected parameter.

Abstract: A fall detection-based help-seeking method and an electronic device, to improve accuracy of fall detection performed by an electronic device and reduce a probability of mistakenly triggering automatic help-seeking of the electronic device. A solution includes: the electronic device includes a motion sensor and the motion sensor includes an acceleration sensor or a gyro sensor. The electronic device collects a first motion parameter of a user by using the motion sensor. The electronic device obtains a fall confidence of the first motion parameter if the first motion parameter matches a first preset fall parameter, where the fall confidence of the first motion parameter is used to represent a probability that the first motion parameter is a motion parameter collected when the user falls. The electronic device sends help-seeking information if the fall confidence of the first motion parameter is greater than a preset confidence threshold.

Abstract: A transmitter for a communication system comprises a digital pre-distortion (DPD) circuit configured to generate a digital intermediate signal by compensating an input signal for distortions resulting from an amplifier, and an adaptation circuitry configured to update the first parameter based on the adjustment signal, the input signal, and an output signal output by the amplifier and based on the digital intermediate signal. The DPD circuit includes an infinite impulse response filter configured to implement a transfer function based on a first parameter, and thermal tracking circuitry configured to generate an adjustment signal corresponding to a thermal change of the amplifier.

Abstract: This application relates to the field of terminals, and discloses a message processing method, message viewing method, and terminal, configured to implement quick message processing and viewing without affecting a current operation. The message processing method is applied to a terminal including a display screen, and the method includes: displaying, by the terminal, an application interface on the display screen; receiving, by the terminal, a message; displaying, by the terminal, a prompt of the message on the application interface; receiving, by the terminal, an input of a user; and continuing displaying, by the terminal, the application interface, responding to the input, terminating displaying the prompt, and processing the message. Embodiments of this application are applied for processing the message.

Abstract: A positioning method applied to a mobile device having a sensor system and a positioning system includes determining that the mobile device is in a preset state; determining a speed reference value of the mobile device based on data detected by the sensor system; determining a position reference value of the mobile device based on preset map data and an estimated positioning value that is output by the positioning system; and correcting, based on the speed reference value and the position reference value, an estimated speed value and the estimated positioning value that are output by the positioning system.

Abstract: A method and an apparatus for setting a sports mode are provided. Two metal endpoints on an outer surface of an intelligent device are respectively used as an output end and a receive end of signals. A signal sent by the output end is compared with a signal received by the receive end to determine whether the intelligent device currently meets a preset condition. First sports characteristic data detected by a sports sensing apparatus is obtained to determine whether the first sports characteristic data matches preset sports characteristic data corresponding to a swimming mode. When two determining results are both “yes”, it can be determined that the intelligent device meets a setting condition of the swimming mode.

Abstract: A transmit circuit operated with time-interpolated digital pre-distortion (DPD) coefficients to improve adjacent channel power ratio (ACPR) performance during a power mode change is provided. The transmit circuit includes a DPD circuit configured to operate with a first DPD coefficient according to a first transmit power level of a transmit power amplifier of the transmit circuit. The transmit circuit further includes a DPD coefficient management engine configured to retrieve a second DPD coefficient corresponding to the second transmit power level. The transmit circuit further includes a DPD coefficient time-interpolation engine configured to compute a set of time-interpolated DPD coefficients corresponding to a set of time instants for a transient period when the transmit power amplifier is adapted to the second DPD coefficient.

Abstract: A digital predistortion (DPD) system includes an input configured to receive a DPD input signal. In some embodiments, a non-linear datapath is coupled to the input, where the non-linear datapath includes a plurality of parallel datapath elements each coupled to the input. By way of example, each of the plurality of parallel datapath elements is configured to add a different inverse non-linear component to the DPD input signal corresponding to a non-linear component of an amplifier. In various examples, a first combiner combines an output of each of the plurality of datapath elements to generate a first predistortion signal. In some embodiments, the DPD system further includes a linear datapath coupled to the input in parallel with the non-linear datapath to generate a second predistortion signal. In addition, a second combiner combines the first predistortion signal and the second predistortion signal to generate a DPD output signal.

Abstract: A method for calculating a tread frequency of a bicycle includes obtaining a first state of an acceleration signal in a first time window, determining a feature point set from the acceleration signal when the first state includes a riding state, where time distribution of a feature point in the feature point set meets a preset periodic distribution condition, and amplitude meets a physical rule, determining that the first state is the riding state when a feature point subset in the feature point set meets a preset reasonableness condition, and calculating, based on the feature point subset, a quantity of circles and a tread frequency that are in the first time window.

Abstract: A method includes: collecting an original signal in a specified time interval, and performing combined acceleration processing on the original signal to obtain a combined acceleration signal; performing state processing on the combined acceleration signal to obtain a motion time interval, and extracting a plurality of feature groups from the combined acceleration signal according to a preset motion rule; and performing screening on the plurality of feature groups to obtain a first feature group, extracting a median value from the first feature group, and obtaining a stride frequency in the specified time interval based on the median value and a collection frequency, and obtaining a quantity of steps through calculation based on the motion time interval and the stride frequency.

Abstract: This application provides a prompt method, applied to a portable device adsorbed on a magnetic holder. The method includes: a display of the portable device being off; and detecting, by the portable device, that a parameter related to a magnetic induction intensity deviates from a preset threshold range, lightening the display of the portable device when, before, or after outputting a voice prompt, and displaying, on the display, prompt information about moving the portable device. By using this method, a user can learn, in time, that the adsorption of the portable device on the magnetic holder is unstable, and move the portable device based on the prompt information, so that the portable device can be stably adsorbed on the magnetic holder, thereby effectively preventing the portable device from sliding down from the magnetic holder.

Abstract: A positioning method and a mobile device, where the method is applied to the mobile device and includes periodically detecting a status of the mobile device, where the status of the mobile device includes a driving state and a walking state, positioning the mobile device using a first positioning algorithm when detecting that a quantity of times that the driving state consecutively occurs reaches M, where the M is an integer greater than one, and positioning the mobile device using a second positioning algorithm when detecting that a quantity of times that the walking state consecutively occurs reaches N, where the N is an integer greater than one. Hence, the status of the mobile device can be more accurately determined by implementing this technical solution to position the mobile device using a positioning algorithm matching an actual status of the mobile device, thereby improving accuracy of a positioning result.

Abstract: A method includes collecting an original signal in a specified time interval, performing combined acceleration processing on the original signal to obtain a combined acceleration signal, combining n data points of the combined acceleration signal into one data segment, extracting a feature point of the data segment, transforming feature points of all data segments into a feature point signal, analyzing the feature point signal to obtain a stable stage and a fluctuation stage of the feature point signal, performing interference period elimination on the feature point signal with the stable stage and the fluctuation stage according to a specified motion rule to obtain a second feature point signal, and counting a quantity of wave crests of the second feature point signal, where the quantity of wave crests is a quantity of steps.

Abstract: A preset application or an application determined by an electronic device based on a preset rule is automatically started when it is detected that an electronic device is attached onto a vehicle magnetic suction bracket. Therefore, the electronic device can automatically respond to an operation of attaching the electronic device onto the vehicle magnetic suction bracket by a user.

Abstract: A method includes calculating, based on a first coordinate transformation matrix and a measured value of a gyroscope that corresponds to the ith sampling moment, a second coordinate transformation matrix corresponding to the ith sampling moment, where the first coordinate transformation matrix is a constant matrix, the first coordinate transformation matrix is a coordinate transformation matrix between a sensor coordinate system and a foot coordinate system, the second coordinate transformation matrix is a coordinate transformation matrix between the foot coordinate system and a ground coordinate system, and i is an integer greater than 0, and calculating, based on the first coordinate transformation matrix and the second coordinate transformation matrix corresponding to the ith sampling moment, an attitude matrix corresponding to the ith sampling moment, where the attitude matrix is a coordinate transformation matrix between the sensor coordinate system and the ground coordinate system.

Abstract: This application provides a prompt method, applied to a portable device adsorbed on a magnetic holder. The method includes: a display of the portable device being off; and detecting, by the portable device, that a parameter related to a magnetic induction intensity deviates from a preset threshold range, lightening the display of the portable device when, before, or after outputting a voice prompt, and displaying, on the display, prompt information about moving the portable device.

Abstract: This application relates to the field of terminals, and discloses a message processing method, message viewing method, and terminal, configured to implement quick message processing and viewing without affecting a current operation. The message processing method is applied to a terminal including a display screen, and the method includes: displaying, by the terminal, an application interface on the display screen; receiving, by the terminal, a message; displaying, by the terminal, a prompt of the message on the application interface; receiving, by the terminal, an input of a user; and continuing displaying, by the terminal, the application interface, responding to the input, terminating displaying the prompt, and processing the message. Embodiments of this application are applied for processing the message.

Abstract: A digital predistortion (DPD) system includes an input configured to receive a DPD input signal. In some examples, a non-linear datapath is coupled to the input, where the non-linear datapath is configured to add a non-linear mirror image component to the DPD input signal to provide a non-linear signal that is used to generate a first predistortion signal. In some embodiments, a linear datapath is coupled to the input in parallel with the non-linear datapath to generate a second predistortion signal. A first combiner is configured to combine the first predistortion signal and the second predistortion signal to generate a DPD output signal.

Abstract: A preset application or an application determined by an electronic device based on a preset rule is automatically started when is detected that an electronic device is attached onto a vehicle magnetic suction bracket. Therefore, the electronic device can automatically respond to an operation of attaching the electronic device onto the vehicle magnetic suction bracket by a user.

Abstract: Described examples provide for digital communication circuits and systems that implement digital pre-distortion (DPD). In an example, a circuit includes a baseband DPD circuit, up-conversion circuitry, and feedback circuitry. The baseband DPD circuit comprises a baseband signal path and pre-distortion path. The pre-distortion path is configured to generate a pre-distortion signal based on the baseband signal. The baseband DPD circuit includes a first adder configured to add the baseband signal from the baseband signal path and the pre-distortion signal from the pre-distortion path to generate a pre-distorted baseband signal. The up-conversion circuitry is configured to convert the pre-distorted baseband signal to a radio frequency signal. The up-conversion circuitry is configured to be coupled to an input of a cable television (CATV) amplifier.