WO2022247655A1

WO2022247655A1 - Method for determining nonlinear feature parameters of power amplifier, and related apparatus

Info

Publication number: WO2022247655A1
Application number: PCT/CN2022/092677
Authority: WO
Inventors: 高翔; 郭志恒; 谢信乾
Original assignee: 华为技术有限公司
Priority date: 2021-05-28
Filing date: 2022-05-13
Publication date: 2022-12-01
Also published as: CN115413009A

Abstract

The present application provides a method for determining nonlinear feature parameters of a power amplifier, and a related apparatus. The method comprises: receiving, on at least one first frequency band, a first reference signal and a second reference signal from a network device, the first reference signal corresponding to a first transmit power, the second reference signal corresponding to a second transmit power, the first transmit power being less than a first threshold, the second transmit power being greater than or equal to the first threshold, and the at least one first frequency band being a frequency band on which a terminal supports post-distortion processing; and determining nonlinear feature parameters of a power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal. By means of the technical solution provided by the present application, the accuracy of determining the nonlinear feature parameters of the power amplifier can be improved, thereby reducing the interference of EVM within the bandwidth of a received signal and that outside the bandwidth to adjacent-frequency signals, improving the demodulation performance of a receiving end, and improving the peak rate of a communication system.

Description

A method for determining nonlinear characteristic parameters of a power amplifier and related devices

This application claims the priority of the Chinese patent application submitted to the China Patent Office on May 28, 2021, with the application number 202110593591.8 and the application name "A Method for Determining the Nonlinear Characteristic Parameters of a Power Amplifier and Related Devices", and the entire content of the application is passed References are incorporated in this application.

technical field

The present application relates to the technical field of wireless communication, and in particular to a method for determining nonlinear characteristic parameters of a power amplifier (PA) and related devices.

Background technique

In wireless communication systems, power amplifiers are used to convert an input signal into a higher power output signal. When the power of the input signal is small or within a certain range, the power of the output signal will change linearly with the change of the power of the input signal. Due to the nonlinear characteristics of some devices in the power amplifier, when the input signal power is high or exceeds a certain range, the power of the output signal will no longer increase linearly, and the phase will also be distorted. In a typical digital communication system, for example, long term evolution (LTE)/5G new radio access technology (new radio access technology) using technologies such as orthogonal frequency-division multiplexing (OFDM) , NR), the nonlinear distortion of the power amplifier will bring about an increase in the error vector magnitude (error vector magnitude, EVM) within the bandwidth of the transmitted signal and spectral leakage outside the bandwidth. At the receiving end, high EVM and spectrum leakage outside the bandwidth will cause intersymbol interference, affect the demodulation performance of high-order modulated signals, and reduce the peak rate of the communication system. Therefore, how to improve the accuracy of determining the nonlinear characteristic parameters in the power amplifier model is an urgent problem to be solved.

Contents of the invention

The embodiment of the present application provides a method for determining the nonlinear characteristic parameters of a power amplifier and related devices, which can improve the accuracy of determining the nonlinear characteristic parameters of the power amplifier, reduce the interference of the EVM within the bandwidth of the received signal and the interference of the adjacent frequency signal outside the bandwidth, and improve The demodulation performance of the receiving end improves the peak rate of the communication system.

In a first aspect, the present application provides a method for determining nonlinear characteristic parameters of a power amplifier. The method can be applied to a terminal or to a module (for example, a chip) in the terminal. The application to the terminal is used as an example for description below. The method may include: the terminal receives a first reference signal and a second reference signal from a network device on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power power, the first transmit power is less than the first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a terminal A frequency band supporting post-distortion processing; the terminal determines the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal.

In the solution provided by the present application, the terminal may use two reference signals with different transmission powers to determine the nonlinear characteristic parameter of the power amplifier on the network device side in at least one first frequency band. Different from the prior art, only one reference signal is used to estimate the nonlinear characteristics and the channel at the same time. In the embodiment of the present application, by decoupling the channel estimation and the nonlinear characteristic estimation, not only the accuracy of the channel estimation can be guaranteed, but also the channel estimation can be improved. Accuracy of Nonlinear Feature Estimation. Furthermore, the terminal can use the estimated nonlinear characteristics to perform better distortion compensation on the received signal, thereby improving demodulation performance and system throughput.

In a possible implementation manner, the first threshold is a power threshold value of an input signal that distorts an output signal of the power amplifier.

In the solution provided by the present application, the first threshold may be a power threshold value of the input signal that distorts the output signal of the power amplifier, and the power threshold value may also be understood as a critical value. When the power of the input signal is less than the first threshold, the power of the output signal changes linearly with the power of the input signal, and when the power of the input signal is greater than or equal to the first threshold, the power of the output signal no longer changes linearly, or It is said that when the power of the input signal is greater than or equal to the first threshold, the output signal is distorted. The terminal equipment uses the undistorted reference signal for channel estimation, and uses the distorted reference signal for nonlinear feature estimation to obtain more accurate nonlinear feature parameters. This scheme can improve the accuracy of determining the nonlinear characteristic parameters of the power amplifier under the premise of ensuring the accuracy of channel estimation.

In a possible implementation manner, the determining the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal includes: according to the first reference signal Determining channel state information; determining a nonlinear characteristic parameter of a power amplifier on the at least one first frequency band according to the channel state information and the second reference signal.

In the solution provided by this application, the terminal may first perform channel estimation according to the first reference signal to obtain channel state information, and then determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the channel state information and the second reference signal. In this way, the channel estimation is performed first according to the first reference signal, and the obtained channel state information is accurate, and then the nonlinear characteristic parameters of the power amplifier are determined according to the accurate channel state information and the second reference signal, which can improve the accuracy of determining the nonlinear characteristic parameters of the power amplifier. sex.

In a possible implementation manner, the modulation manner of the second reference signal is different from that of the first reference signal.

In a possible implementation manner, time domain resources occupied by the second reference signal and the first reference signal are different.

In a possible implementation manner, the interval between the OFDM symbols occupied by the first reference signal and the OFDM symbols occupied by the second reference signal is N, where N is a non-zero integer.

In a possible implementation manner, the method further includes: the terminal receiving first indication information from the network device, where the first indication information is used to instruct the terminal to determine on the at least one first frequency band Power amplifier nonlinear characteristic parameters.

In the solution provided by this application, the terminal determines whether to determine the nonlinear characteristics of the power amplifier in at least one first frequency band according to the first reference signal and the second reference signal according to whether it receives information indicating to determine the nonlinear characteristic parameters of the power amplifier parameter. It can prevent the terminal from always performing the behavior of determining at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal, thereby improving communication flexibility and saving terminal overhead.

In a possible implementation manner, the method further includes: the terminal reports the nonlinear characteristic parameter of the power amplifier to the network device.

In a possible implementation manner, the method further includes: the terminal receives a second signal from the network device, and the second signal is the first signal performed by the network device according to the nonlinear characteristic parameter of the power amplifier. The signal obtained by pre-distortion processing.

In the solution provided by this application, after the terminal reports the nonlinear characteristic parameters of the power amplifier to the network device, if the network device wants to send a signal to the terminal on at least one first frequency band, it can first perform a signal transmission according to the nonlinear characteristic parameter of the power amplifier. Perform pre-distortion processing, and then send the pre-distortion processed signal to the terminal. In this way, the signal received by the terminal is a non-distorted signal, which improves demodulation performance and reduces the complexity of signal processing by the terminal.

In a possible implementation manner, the method further includes: the terminal receiving a third signal from the network device; performing post-distortion processing on the third signal according to the nonlinear characteristic parameters of the power amplifier to obtain a fourth signal .

In the solution provided by this application, after the terminal determines the nonlinear characteristic parameters of the power amplifier on at least one first frequency band, it may perform post-distortion processing on the signal (such as the third signal) sent by the network device on at least one first frequency band, That is, distortion compensation is performed on the signal. After performing distortion compensation on the signal, the terminal can continue to demodulate the compensated signal, which can improve demodulation performance.

In a possible implementation manner, the method further includes: receiving second indication information from the network device, where the second indication information is used to instruct the terminal to perform post-distortion processing on the third signal.

In the solution provided by this application, after the terminal determines at least one nonlinear characteristic parameter of the power amplifier in the first frequency band, it may perform post-distortion processing on the signal sent by the network device in the frequency band, that is, perform distortion compensation on the signal. It is also possible not to perform distortion compensation on the signal. In such a case, the network device may send the second indication information to the terminal, instructing the terminal to perform post-distortion processing on the received signal on at least one first frequency band, and the terminal will perform post-distortion processing on the received signal only after receiving the second indication information. operation of distortion compensation. The terminal performs post-distortion processing on the signal according to the instruction information of the network device, instead of performing post-distortion processing on the signal all the time, enabling the terminal to perform post-distortion processing according to actual transmission requirements, and reducing the terminal's overhead.

In a possible implementation manner, the determining the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal includes: according to the first reference signal , the second reference signal, the maximum distortion order of the terminal and/or the maximum delay supported by the terminal, and the power amplifier model determining nonlinear characteristic parameters of the power amplifier on the at least one first frequency band.

In the solution provided by this application, the terminal may determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal, the second reference signal, the maximum distortion order of the terminal, and the power amplifier model, or the terminal may Determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal, the second reference signal, the maximum delay supported by the terminal, and the power amplifier model, or the terminal may determine according to the first reference signal, the second reference signal, The maximum distortion order of the terminal, the maximum delay supported by the terminal and the power amplifier model determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band.

In a possible implementation manner, the method further includes: reporting the first frequency band set, the maximum distortion order of the terminal, and/or the maximum delay supported by the terminal to the network device.

In the solution provided by this application, the terminal may first judge whether each frequency band performs post-distortion processing according to a predefined criterion, and report the first frequency band set including at least one first frequency band supporting post-distortion processing. Because power amplifier models are divided into power amplifier models without memory and power amplifier models with memory, different types of power amplifier models include different parameters. Therefore, the terminal can report at least one of the maximum distortion order of the terminal and the maximum delay supported by the terminal, so as to support determination of nonlinear characteristic parameters of the power amplifier according to different types of power amplifier models.

In the second aspect, the present application provides a method for determining the nonlinear characteristic parameters of a power amplifier. This method can be applied to network equipment, and can also be applied to modules (for example, chips) in network equipment. The following uses network equipment as an example to describe. The method may include: the network device sends a first reference signal and a second reference signal to the terminal on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power , the first transmit power is less than the first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to the first frequency band set, and the at least one first frequency band is supported by the terminal Frequency band for post-distortion processing.

In the solution provided by this application, the network device uses the first transmission power to send the first reference signal to the terminal on at least one first frequency band that the terminal supports post-distortion processing, and uses the second transmission power to send the second reference signal to the terminal, The first sending power is less than the first threshold, and the second sending power is greater than or equal to the first threshold. The terminal may determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band by using two reference signals with different transmission powers. Unlike in the prior art, only one reference signal is used to estimate the nonlinear characteristics and the channel at the same time. In the embodiment of the present application, the first reference signal is used for channel estimation, and the second reference signal is used for nonlinear characteristic estimation. By combining the channel estimation Decoupling with nonlinear feature estimation can not only ensure the accuracy of channel estimation, but also improve the accuracy of nonlinear feature estimation. The receiving end can use the estimated nonlinear characteristics to perform better distortion compensation on the received signal, thereby improving demodulation performance and system throughput.

It should be understood that the executive body of the second aspect is a network device, and the specific content of the second aspect corresponds to the content of the first aspect. The corresponding features and beneficial effects of the second aspect can refer to the description of the first aspect. To avoid repetition, the Detailed description is omitted here.

In a possible implementation manner, the method further includes: sending first indication information to the terminal, where the first indication information is used to instruct the terminal to determine that the power amplifier is not Linear feature parameters.

In a possible implementation manner, the method further includes: receiving nonlinear characteristic parameters of the power amplifier from the terminal.

In a possible implementation manner, the method further includes: performing predistortion processing on the first signal according to the nonlinear characteristic parameter of the power amplifier to obtain a second signal; and sending the second signal to the terminal.

In a possible implementation manner, the method further includes: sending a third signal to the terminal.

In a possible implementation manner, the method further includes: sending second indication information to the terminal, where the second indication information is used to instruct the terminal to perform post-distortion processing on the third signal.

In a possible implementation manner, the method further includes: receiving from the terminal the first frequency band set, the maximum distortion order of the terminal, and/or the maximum delay supported by the terminal.

In the third aspect, the embodiment of the present application provides a method for determining nonlinear characteristic parameters of a power amplifier. This method can be applied to a terminal or to a module (for example, a chip) in the terminal. The following uses the terminal as an example to describe . The method may include: sending a first reference signal and a second reference signal to a network device on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power, The first transmit power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a terminal supported Frequency band for distortion processing.

In the solution provided by this application, the terminal uses the first transmit power to send the first reference signal to the network device on at least one first frequency band that supports post-distortion processing, and uses the second transmit power to send the second reference signal to the network device, The first sending power is less than the first threshold, and the second sending power is greater than or equal to the first threshold. The network device may use the two reference signals with different transmission powers to determine at least one nonlinear characteristic parameter of the power amplifier on the terminal side on the first frequency band. Unlike in the prior art, only one reference signal is used to estimate the nonlinear characteristics and the channel at the same time. In the embodiment of the present application, the first reference signal is used for channel estimation, and the second reference signal is used for nonlinear characteristic estimation. By combining the channel estimation Decoupling with nonlinear feature estimation can not only ensure the accuracy of channel estimation, but also improve the accuracy of nonlinear feature estimation. The receiving end can use the estimated nonlinear characteristics to perform better distortion compensation on the received signal, thereby improving demodulation performance and system throughput.

In the solution provided by the present application, the first threshold may be a power threshold value of the input signal that distorts the output signal of the power amplifier, and the power threshold value may also be understood as a critical value. When the power of the input signal is less than the first threshold, the power of the output signal changes linearly with the power of the input signal, and when the power of the input signal is greater than or equal to the first threshold, the power of the output signal no longer changes linearly, or It is said that when the power of the input signal is greater than or equal to the first threshold, the output signal is distorted. Network devices perform channel estimation through undistorted reference signals, and use distorted reference signals to perform nonlinear feature estimation. This scheme can improve the accuracy of determining the nonlinear characteristic parameters of the power amplifier under the premise of ensuring the accuracy of channel estimation.

In a possible implementation manner, the method further includes: sending third indication information to the network device, where the third indication information is used to instruct the network device to determine power in the at least one first frequency band Amplifier nonlinear characteristic parameters.

In the solution provided by this application, the terminal may first send the third indication information to the network device, and through the third indication information, instruct the network device to determine the nonlinear characteristic parameters of the power amplifier in the frequency band that the terminal supports post-distortion processing, and the network device receives the first After three indications, at least one nonlinear characteristic parameter of the power amplifier in the first frequency band is determined according to the first reference signal and the second reference signal. Optionally, if the network device does not receive the third indication information reported by the terminal, when receiving the first reference signal and the second reference signal, it may also determine the nonlinear characteristic parameters of the power amplifier by itself.

In a possible implementation manner, the method further includes: receiving fourth indication information from the network device, where the fourth indication information is used to indicate the difference between the first reference signal and the second reference signal The transmit power difference between them.

In the solution provided by this application, the network device can configure the terminal to send the transmit power difference between the first reference signal and the second reference signal through high-layer signaling, so that the first transmit power is less than the first threshold, and the second transmit power is greater than or equal to the first threshold.

In a possible implementation manner, the method further includes: receiving the nonlinear characteristic parameter of the power amplifier from the network device.

In the solution provided by the present application, after the network device determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band, it can perform post-distortion processing on the received signal through the nonlinear characteristic parameter of the power amplifier, or can use the nonlinear characteristic parameter of the power amplifier The parameters are sent to the terminal, so that the terminal performs pre-distortion processing on the transmitted signal.

In a possible implementation manner, the method further includes: performing predistortion processing on the fifth signal according to the nonlinear characteristic parameter of the power amplifier to obtain a sixth signal; and sending the sixth signal to the network device.

In the solution provided by the present application, after the terminal receives the nonlinear characteristic parameter of the power amplifier from the network device, if the terminal wants to send a signal to the network device on at least one first frequency band, it may first use the non-linear characteristic parameter of the power amplifier The parameter performs pre-distortion processing on the transmitted signal, and then sends the pre-distorted signal to the network device. In this way, the signal received by the network device is a non-distorted signal, which improves demodulation performance.

In a possible implementation manner, the method further includes: sending a seventh signal to the network device.

In a possible implementation manner, the method further includes: sending fifth indication information to the network device, where the fifth indication information is used to instruct the network device to perform post-distortion processing on the seventh signal.

In the solution provided by this application, after the network device determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band, it may perform post-distortion processing on the signal sent by the terminal in the frequency band, that is, perform distortion compensation on the signal. It is also possible not to perform distortion compensation on the signal. In such a case, the terminal may send fifth instruction information to the network device, instructing the network device to perform post-distortion processing on the received signal on at least one first frequency band, and the network device will not execute the receiving signal until the fifth instruction information is received. The signal is subjected to the operation of distortion compensation.

In a possible implementation manner, the method further includes: reporting the first frequency band set to the network device.

In the solution provided by this application, the terminal may first judge whether post-distortion processing is performed for each frequency band according to a predefined criterion, and report the first frequency band set including at least one first frequency band that supports post-distortion processing.

In the fourth aspect, the present application provides a method for determining the nonlinear characteristic parameters of a power amplifier, which can be applied to network equipment, or to modules (for example, chips) in the network equipment, and the application to network equipment is taken as an example below to describe. The method may include: receiving a first reference signal and a second reference signal from a terminal on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power, The first transmit power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a terminal supported A frequency band for distortion processing; determining a nonlinear characteristic parameter of the power amplifier in the at least one first frequency band according to the first reference signal and the second reference signal.

In the solution provided by this application, the terminal uses the first transmission power to send the first reference signal to the terminal on at least one first frequency band that supports post-distortion processing, and uses the second transmission power to send the second reference signal to the terminal. The first The sending power is less than the first threshold, and the second sending power is greater than or equal to the first threshold. The network device may use the two reference signals with different transmission powers to determine at least one nonlinear characteristic parameter of the power amplifier on the terminal side on the first frequency band. Unlike in the prior art, only one reference signal is used to estimate the nonlinear characteristics and the channel at the same time. In the embodiment of the present application, the first reference signal is used for channel estimation, and the second reference signal is used for nonlinear characteristic estimation. By combining the channel estimation Decoupling with nonlinear feature estimation can not only ensure the accuracy of channel estimation, but also improve the accuracy of nonlinear feature estimation. The receiving end can use the estimated nonlinear characteristics to perform better distortion compensation on the received signal, thereby improving demodulation performance and system throughput.

It should be understood that the executive body of the fourth aspect is a network device, and the specific content of the fourth aspect corresponds to the content of the third aspect. The corresponding features and beneficial effects of the fourth aspect can refer to the description of the third aspect. In order to avoid repetition, this Detailed description is omitted here.

In the solution provided by this application, the network device determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal: the channel estimation can be performed first according to the first reference signal, and then according to the second The reference signal determines the nonlinear characteristic parameters of the power amplifier; or first determines the nonlinear characteristic parameters of the power amplifier according to the second reference signal, and then performs channel estimation according to the first reference signal; or simultaneously determines the power amplifier according to the first reference signal and the second reference signal Amplifier nonlinear characteristic parameters. In practical applications, different implementation methods can be selected according to different algorithms. A preferred implementation manner: channel estimation may be performed first according to the first reference signal to obtain channel state information, and then at least one nonlinear characteristic parameter of the power amplifier on the first frequency band may be determined according to the channel state information and the second reference signal. In this way, the channel estimation is performed first according to the first reference signal, and the obtained channel state information is accurate, and then the nonlinear characteristic parameters of the power amplifier are determined according to the accurate channel state information and the second reference signal, which can improve the accuracy of determining the nonlinear characteristic parameters of the power amplifier. sex.

In a possible implementation manner, the method further includes: receiving third indication information from the terminal, where the third indication information is used to instruct the network device to determine power on the at least one first frequency band Amplifier nonlinear characteristic parameters.

In a possible implementation manner, the method further includes: sending fourth indication information to the terminal, where the fourth indication information is used to indicate the distance between the first reference signal and the second reference signal Poor transmit power.

In a possible implementation manner, the method further includes: sending the nonlinear characteristic parameter of the power amplifier to the terminal.

In a possible implementation manner, the method further includes: receiving a sixth signal from the terminal, where the sixth signal is that the terminal pre-distorts the fifth signal according to the nonlinear characteristic parameter of the power amplifier Process the resulting signal.

In a possible implementation manner, the method further includes: receiving a seventh signal from the terminal; performing post-distortion processing on the seventh signal according to the nonlinear characteristic parameter of the power amplifier to obtain an eighth signal.

In a possible implementation manner, the method further includes: receiving fifth indication information from the terminal, where the fifth indication information is used to instruct the network device to perform post-distortion processing on the seventh signal.

In the solution provided by this application, the network device may determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal, the second reference signal, the maximum distortion order of the terminal, and the power amplifier model, or, the network The device may determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal, the second reference signal, the maximum delay supported by the terminal, and the power amplifier model, or the network device may determine the nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal, the second The reference signal, the maximum distortion order of the terminal, the maximum delay supported by the terminal, and the power amplifier model determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band.

In a possible implementation manner, the method further includes: receiving a first frequency band set from the terminal.

In a fifth aspect, the embodiment of the present application provides a communication device.

For the beneficial effects, reference may be made to the description of the first aspect, which will not be repeated here. The communication device has the function of implementing the actions in the method example of the first aspect above. The functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible implementation manner, the communication device includes:

A receiving unit, configured to receive a first reference signal and a second reference signal from a network device on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power , the first transmit power is less than the first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to the first frequency band set, and the at least one first frequency band is supported by the terminal Frequency bands for post-distortion processing;

A determining unit, configured to determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal.

In a possible implementation manner, the determining unit determines the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal, specifically for:

determining channel state information according to the first reference signal;

determining a nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the channel state information and the second reference signal.

In a possible implementation manner, the receiving unit is further configured to:

Receive first indication information from the network device, where the first indication information is used to instruct the terminal to determine a nonlinear characteristic parameter of a power amplifier on the at least one first frequency band.

In a possible implementation manner, the device further includes:

A sending unit, configured to report the nonlinear characteristic parameters of the power amplifier to the network device.

receiving a second signal from the network device, where the second signal is a signal obtained by the network device performing pre-distortion processing on the first signal according to the nonlinear characteristic parameter of the power amplifier.

receiving a third signal from the network device;

The device also includes:

A processing unit, configured to perform post-distortion processing on the third signal according to the nonlinear characteristic parameters of the power amplifier to obtain a fourth signal.

receiving second indication information from the network device, where the second indication information is used to instruct the terminal to perform post-distortion processing on the third signal.

Determine the power on the at least one first frequency band according to the first reference signal, the second reference signal, the maximum distortion order of the terminal and/or the maximum delay supported by the terminal, and the power amplifier model Amplifier nonlinear characteristic parameters.

In a possible implementation manner, the sending unit is further configured to:

Reporting the first frequency band set, the maximum distortion order of the terminal and/or the maximum delay supported by the terminal to the network device.

In a sixth aspect, the embodiment of the present application provides a communication device.

For the beneficial effects, reference may be made to the description of the second aspect, which will not be repeated here. The communication device has the function of implementing the actions in the method example of the second aspect above. The functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible implementation manner, the communication device includes: a sending unit, configured to send a first reference signal and a second reference signal to the terminal on at least one first frequency band, the first reference signal corresponds to the first sending power, the second reference signal corresponds to a second transmission power, the first transmission power is less than the first threshold, the second transmission power is greater than or equal to the first threshold, and the at least one first frequency band belongs to the first A set of frequency bands, the at least one first frequency band is a frequency band for which the terminal supports post-distortion processing.

In a possible implementation manner, the sending unit is further configured to:

Sending first indication information to the terminal, where the first indication information is used to instruct the terminal to determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band.

In a possible implementation manner, the device further includes:

The receiving unit is configured to receive the nonlinear characteristic parameter of the power amplifier from the terminal.

In a possible implementation manner, the device further includes:

A processing unit, configured to perform predistortion processing on the first signal according to the nonlinear characteristic parameters of the power amplifier to obtain the second signal;

The sending unit is further configured to: send the second signal to the terminal.

In a possible implementation manner, the sending unit is further configured to:

Send a third signal to the terminal.

In a possible implementation manner, the sending unit is further configured to:

Sending second indication information to the terminal, where the second indication information is used to instruct the terminal to perform post-distortion processing on the third signal.

The first set of frequency bands, the maximum distortion order of the terminal, and/or the maximum delay supported by the terminal are received from the terminal.

In a seventh aspect, the embodiment of the present application provides a communication device.

For the beneficial effects, reference may be made to the description of the third aspect, which will not be repeated here. The communication device has the function of implementing the actions in the method example of the third aspect above. The functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible implementation manner, the communication device includes:

a sending unit, configured to send a first reference signal and a second reference signal to a network device on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power, The first transmit power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a terminal supported Frequency band for distortion processing.

In a possible implementation manner, the sending unit is further configured to:

Sending third indication information to the network device, where the third indication information is used to instruct the network device to determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band.

In a possible implementation manner, the device further includes:

A receiving unit, configured to receive fourth indication information from the network device, where the fourth indication information is used to indicate a transmission power difference between the first reference signal and the second reference signal.

The nonlinear characteristic parameter of the power amplifier is received from the network device.

In a possible implementation manner, the device further includes:

A processing unit, configured to perform predistortion processing on the fifth signal according to the nonlinear characteristic parameters of the power amplifier to obtain a sixth signal;

The sending unit is further configured to send the sixth signal to the network device.

In a possible implementation manner, the sending unit is further configured to:

sending a seventh signal to the network device.

In a possible implementation manner, the sending unit is further configured to:

Sending fifth indication information to the network device, where the fifth indication information is used to instruct the network device to perform post-distortion processing on the seventh signal.

In a possible implementation manner, the sending unit is further configured to:

Report the first frequency band set to the network device.

In an eighth aspect, the embodiment of the present application provides a communication device.

For the beneficial effects, reference may be made to the description of the fourth aspect, which will not be repeated here. The communication device has the function of implementing the actions in the method example of the fourth aspect above. The functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible implementation manner, the communication device includes:

a receiving unit, configured to receive a first reference signal and a second reference signal from a terminal on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power, The first transmit power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a terminal supported frequency band for distortion processing;

determining channel state information according to the first reference signal;

receiving third indication information from the terminal, where the third indication information is used to instruct the network device to determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band.

In a possible implementation manner, the device further includes:

A sending unit, configured to send fourth indication information to the terminal, where the fourth indication information is used to indicate a transmission power difference between the first reference signal and the second reference signal.

In a possible implementation manner, the sending unit is further configured to:

Send the nonlinear characteristic parameter of the power amplifier to the terminal.

Receive a sixth signal from the terminal, where the sixth signal is a signal obtained by performing predistortion processing on the fifth signal by the terminal according to the nonlinear characteristic parameter of the power amplifier.

receiving a seventh signal from the terminal;

The device also includes:

A processing unit, configured to perform post-distortion processing on the seventh signal according to the nonlinear characteristic parameters of the power amplifier to obtain an eighth signal.

receiving fifth indication information from the terminal, where the fifth indication information is used to instruct the network device to perform post-distortion processing on the seventh signal.

A first set of frequency bands is received from the terminal.

In a ninth aspect, a communication device is provided, and the communication device may be a terminal, or may be a module (for example, a chip) in the terminal. The device may include a processor, a memory, an input interface and an output interface, the input interface is used to receive information from other communication devices other than the communication device, and the output interface is used to send information to other communication devices other than the communication device Other communication devices output information, and the processor invokes the computer program stored in the memory to execute the first aspect or the method for determining the nonlinear characteristic parameters of the power amplifier provided by any implementation manner of the first aspect; or the third aspect or the third aspect Any implementation manner of the aspect provides a method for determining nonlinear characteristic parameters of a power amplifier.

In a tenth aspect, a communication device is provided, and the communication device may be a network device, or may be a module (for example, a chip) in the network device. The device may include a processor, a memory, an input interface and an output interface, the input interface is used to receive information from other communication devices other than the communication device, and the output interface is used to send information to other communication devices other than the communication device Other communication devices output information, and the processor calls the computer program stored in the memory to execute the second aspect or the method for determining the nonlinear characteristic parameters of the power amplifier provided by any implementation manner of the second aspect; or the fourth aspect or the fourth aspect Any implementation manner of the aspect provides a method for determining nonlinear characteristic parameters of a power amplifier.

In an eleventh aspect, the present application provides a communication system, which includes at least one terminal and at least one network device. When at least one of the aforementioned terminal devices and at least one of the aforementioned network devices are running in the communication system, use To perform any method described in the first or second aspect above, or to perform any method described in the third aspect or fourth aspect above.

In a twelfth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored. When the computer program or computer instructions are executed, the above-mentioned first aspect and any one of them may be , the second aspect and any possible implementation thereof, the third aspect and any possible implementation thereof, or the method described in the fourth aspect and any possible implementation thereof is performed.

In a thirteenth aspect, the present application provides a computer program product including executable instructions. When the computer program product runs on a user device, the above-mentioned first aspect and any possible implementation thereof, and the second aspect and any possible implementation thereof, the third aspect and any possible implementation thereof, and the fourth aspect and any possible implementation thereof are performed.

In a fourteenth aspect, the present application provides a chip system, which includes a processor and may also include a memory, for realizing the first aspect and any possible implementation thereof, the second aspect and any possible implementation thereof implementation, the third aspect and any possible implementation thereof, and the method in the fourth aspect and any possible implementation thereof. The system-on-a-chip may consist of chips, or may include chips and other discrete devices.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments.

FIG. 1 is a schematic diagram of a typical power amplifier model estimation algorithm flow provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a network architecture provided by an embodiment of the present application;

FIG. 3 is a schematic flowchart of a method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of time-domain resource positions of a first reference signal and a second reference signal provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application;

FIG. 6 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application;

FIG. 7 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application;

FIG. 8 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application;

FIG. 9 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

Fig. 11 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 12 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 13 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

Fig. 14 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 15 is a schematic structural diagram of a terminal provided by an embodiment of the present application.

Detailed ways

The embodiments of the present application will be described clearly and in detail below with reference to the accompanying drawings in the embodiments of the present application.

The terms used in the embodiments of the present application are only used to explain specific embodiments of the present application, and are not intended to limit the present application.

In wireless communication systems, power amplifiers are used to convert an input signal into a higher power output signal. When the power of the input signal is small or within a certain range, the power of the output signal will change linearly with the change of the power of the input signal. Due to the nonlinear characteristics of some devices in the power amplifier, when the input signal power is high or exceeds a certain range, the power of the output signal will no longer increase linearly, and the phase will also be distorted. In a typical digital communication system, such as long-term evolution LTE/5G NR using technologies such as OFDM, the nonlinear distortion of the power amplifier will cause EVM increase within the bandwidth of the transmitted signal and spectrum leakage outside the bandwidth. At the receiving end, high EVM and spectrum leakage outside the bandwidth will cause intersymbol interference, affect the demodulation performance of high-order modulated signals, and reduce the peak rate of the communication system. Therefore, how to improve the accuracy of determining the nonlinear characteristic parameters in the power amplifier model is an urgent problem to be solved.

The power amplifier model is divided into a power amplifier model without memory and a power amplifier model with memory. The specific formula of the power amplifier model with memory is as follows:

Among them, x(n) and y(n) are the input and output signals of the power amplifier at a certain moment respectively, and the complex number α _2d-1,q is the 2d-1 order nonlinear term of the power amplifier model after delay τ _q D is the maximum distortion order supported by the receiving end, and Q is the maximum delay number supported by the receiving end. The power amplifier model without memory is a special case of the model with memory, that is, Q=0 and τ _q =0. The specific formula of the memoryless power amplifier model is as follows:

In summary, the power amplifier model is a polynomial acting on any input signal composed of all complex numbers α _2d-1,q (corresponding to the power amplifier model with memory) or α _2d-1 (corresponding to the power amplifier model without memory). It can be seen that whether the transmitting end performs pre-distortion on the transmitted signal or the receiving end performs post-distortion on the received signal, accurately knowing the coefficient α in the polynomial is the key to improving demodulation performance. Although the coefficient α in the power amplifier model can be pre-configured to the receiving end, considering that the performance of power amplifiers produced in different batches is not the same, and the power amplifier model will change in real time with factors such as ambient temperature, it is measured in real time more accurate. Based on this, please refer to FIG. 1 , which is a schematic diagram of a typical power amplifier model estimation algorithm flow provided by an embodiment of the present application. As shown in Figure 1,

is the channel estimated by the receiver using a reference signal (such as a demodulation reference signal (DMRS) or a sounding reference signal (SRS)) and a received signal Y, x(n-τ _q )|x( n-τ _q )| ^2(d-1) is the reference signal distortion determined according to the maximum memory delay τ _q and the maximum nonlinear order 2(d-1). Then the polynomial coefficient α in the power amplifier model can be estimated (for example using least square method).

If the receiving end needs to estimate an accurate power amplifier model, the reference signal at the transmitting end must be fully distorted (such as increasing the transmission power, or selecting a sequence with a higher peak-to-average power ratio (PAPR) to generate a reference signal). In addition, accurate estimation of the power amplifier model also depends on the accuracy of channel estimation, but only when the reference signal transmitted by the transmitting end is less distorted, the estimated channel is more accurate. Therefore, when the communication system uses the same reference signal to estimate the power amplifier model and the channel, it is difficult to guarantee the estimation accuracy of the channel and the power amplifier model.

The technical problems to be solved in the embodiments of the present application may include: using two reference signals with different transmission powers to estimate the power amplifier model, that is, using the undistorted reference signal for channel estimation and using the distorted signal for nonlinear feature estimation, which can not only ensure channel estimation It can also improve the accuracy of nonlinear feature estimation, thereby improving the accuracy of estimating the power amplifier model. The receiving end can use the estimated nonlinear characteristics to perform better distortion compensation on the received signal, reduce the EVM within the bandwidth of the received signal and the interference to adjacent frequency signals outside the bandwidth, improve the demodulation performance, and then increase the peak rate of the communication system.

Based on the above, in order to better understand a method for determining a nonlinear characteristic parameter of a power amplifier and a related device proposed in the present application, the network architecture applied in the embodiment of the present application is firstly described below.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram of a network architecture provided by an embodiment of the present application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system for mobile communication (global system for mobile communication, GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), LTE system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, universal mobile telecommunications system (UMTS) system, enhanced data rate for GSM evolution (EDGE) system, worldwide interoperability for microwave access (WiMAX) system . The technical solution of the embodiment of the present application can also be applied to other communication systems, such as public land mobile network (public land mobile network, PLMN) system, advanced long-term evolution (LTE advanced, LTE-A) system, fifth generation mobile communication ( The 5th generation (5G) system, new radio (new radio, NR) system, machine-to-machine communication (machine to machine, M2M) system, or other communication systems that evolve in the future, etc., are not limited in this embodiment of the present application. The technical solutions provided by the embodiments of this application can also be applied to other communication systems, as long as there are entities in the communication system that can send control information and send (and/or receive) transport blocks, there are other entities in the communication system that can receive control information. information, and receiving (and/or sending) transport blocks.

As shown in FIG. 2 , the network device and terminals 1 to 6 form a communication system, and in the communication system, the network device sends control information and/or transmission blocks to one or more of terminals 1 to 6 . In addition, terminal 4 to terminal 6 can also form a communication system, in which terminal 5 can send control information and/or transmission blocks to one or more terminals among terminal 5 and terminal 6 .

The terminal in the embodiment of this application is an entity on the user side for receiving or transmitting signals, such as user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device , user terminal, terminal, wireless communication device, user agent or user device. The terminal can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), with a wireless communication function Handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminals in 5G networks or terminals in public land mobile networks (PLMN) that will evolve in the future, etc., The embodiment of the present application does not limit this.

As an example but not a limitation, in this embodiment of the application, the terminal may also be a wearable device. Wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.

In addition, in the embodiment of the present application, the terminal can also be a terminal in the Internet of Things (Internet of Things, IoT) system. IoT is an important part of the development of information technology in the future. Connection, so as to realize the intelligent network of man-machine interconnection and object interconnection. In the embodiment of the present application, the IOT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrow band (NB) technology.

In addition, in this embodiment of the application, the terminal can also include sensors such as smart printers, train detectors, and gas stations, and its main functions include collecting data (part of the terminal), receiving control information and downlink data from network devices, and sending electromagnetic waves to The network device transmits uplink data.

The network device in the embodiment of the present application is an entity for transmitting or receiving signals, and may be a device for communicating with a terminal. The network device may be a global system for mobile communications (GSM) system or a code division multiple Base station (base transceiver station, BTS) in code division multiple access (CDMA), also can be the base station (NodeB, NB) in wideband code division multiple access (wideband code division multiple access, WCDMA) system, can also be The evolved base station (evolved NodeB, eNB or eNodeB) in the LTE system can also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, or the network device can be a relay station, an access point , in-vehicle devices, wearable devices, and network devices in a 5G network or network devices in a future evolved PLMN network, etc., are not limited in this embodiment of the present application.

The network device in this embodiment of the present application may be a device in a wireless network, for example, a radio access network (radio access network, RAN) node that connects a terminal to the wireless network. At present, some examples of RAN nodes are: base station, next-generation base station gNB, transmission reception point (transmission reception point, TRP), evolved node B (evolved Node B, eNB), home base station, baseband unit (baseband unit, BBU) , or the access point (access point, AP) in the WiFi system, etc. In a network structure, the network device may include a centralized unit (centralized unit, CU) node, or a distributed unit (distributed unit, DU) node, or a RAN device including a CU node and a DU node.

In the embodiment of the present application, the terminal or network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that realize business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide the method according to the embodiment of the present application. For example, the execution subject of the method provided by the embodiment of the present application may be a terminal or a network device, or a functional module in a terminal or a network device that can call a program and execute the program.

Additionally, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application covers a computer program accessible from any computer readable device, carrier or media. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disk, floppy disk, or tape, etc.), optical disks (e.g., compact disc (compact disc, CD), digital versatile disc (digital versatile disc, DVD) etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), card, stick or key drive, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and/or carrying instructions and/or data.

It should be noted that the number and types of terminals included in the network architecture shown in FIG. 2 are just an example, and this embodiment of the present application is not limited thereto. For example, it may also include more or fewer terminals communicating with network devices, which are not described one by one in the accompanying drawings for brevity of description. In addition, in the network architecture shown in Figure 2, although network devices and terminals are shown, the application scenario may not be limited to include network devices and terminals, for example, it may also include core network nodes or bearer virtualization Devices with network functions and the like are obvious to those skilled in the art, and will not be repeated here.

The definitions of technical terms that may appear in the embodiments of the present application are first given below:

(1) channel state information (channel state information, CSI)

During the process of the signal passing through the channel from the transmitter to the receiver, it may experience scattering, fading, and energy attenuation with distance. Channel state information is used to characterize the channel. CSI may include channel quality indicator (channel quality indicator, CQI), precoding matrix indicator (precoding matrix indicator, PMI), CSI-RS resource indicator (CSI-RS resource indicator, CRI), synchronization signal/physical broadcast channel block (synchronization At least one of signal/physical bradcast channel block (SSB) resource indicator (SSB resource indicator, SSBRI), layer indicator (layer indicator, LI), rank indicator (rank indicator, RI), L1-RSRP and L1-SINR. These CSI information can be sent by the user equipment to the base station through PUCCH or PUSCH.

(2) Reference signal (reference signal, RS)

The reference signal is a known signal provided by the transmitting end to the receiving end for channel estimation or channel detection. In this application, the reference signal can be used for channel measurement, interference measurement, etc., such as measuring reference signal receiving quality (reference signal receiving quality, RSRQ), signal-noise ratio (signal-noise ratio, SNR), signal-to-interference-noise ratio (signal to interference plus noise ratio, SINR, short for SINR), channel quality indicator (Chanel quality indicator, CQI), precoding matrix indicator (precoding matrix indicator, PMI) and other parameters.

(3) Demodulation reference signal DMRS

The DMRS is a known sequence at the transceiver end, and is mapped on a time-frequency resource with a known location. For uplink transmission, the transmitting end uses the same precoding and antenna port as the uplink transmission signal to send DMRS. Since the DMRS and the uplink transmission signal experience the same fading channel, the receiving end can base on the received DMRS signal and the Based on the known DMRS sequence, the equivalent fading channel experienced by the uplink signal transmission is estimated, and the uplink data demodulation is completed based on the estimated equivalent channel state information. The downlink transmission is similar to the uplink transmission and will not be repeated here.

(4) Phase tracking reference signal (phase-tracking reference signal, PTRS)

Transmitter phase noise increases with operating frequency. PTRS plays a crucial role especially at mmWave frequencies to minimize the impact of oscillator phase noise on system performance. One of the main problems with the introduction of phase noise into OFDM signals is the common phase rotation of all subcarriers, which is known as common phase error. The main function of the PTRS is to track the phase of the local oscillators of the transmitter and receiver. PTRS can suppress phase noise and common phase errors, especially at higher mmWave frequencies, present in both uplink and downlink channels.

(5) frequency band

The frequency band, which may also be called a frequency band, or also called an operating frequency band, includes an uplink operating frequency band and a downlink operating frequency band. The uplink/downlink operating frequency band is a continuous frequency range, which is determined by the minimum frequency of the uplink/downlink operating frequency band and the maximum frequency of the uplink/downlink operating frequency band.

(6) Distortion

In a wireless communication system, when the power of the input signal of the power amplifier is small or within a certain range, the power of the output signal will change linearly with the change of the power of the input signal. However, when the power of the input signal is higher or exceeds a certain range, the power of the output signal no longer increases linearly due to the nonlinear characteristics of some devices in the power amplifier. In this application, this non-linear growth can be understood as the phase distortion of the signal during transmission.

(7) Predistortion

Predistortion technology is a widely used linearization technology for RF power amplifiers. Predistortion is to add a system whose characteristics are exactly opposite to the nonlinear distortion of the system including the power amplifier, and compensate each other. Before the input signal enters the power amplifier, the pre-distortion technology is used to compensate the gain and phase changes in the entire power range.

(8) post-distortion

Post-distortion technology is a widely used linearization technique for RF power amplifiers. The post-distortion is to add a system whose characteristics are just opposite to the nonlinear distortion of the system including the power amplifier, and compensate each other. After the output signal is output to the power amplifier, by using the post-distortion technology, the gain and phase changes are compensated within the entire power variation range.

(9) Time Division Duplex (TDD) and Frequency Division Duplex (FDD)

TDD and FDD are two duplex modes in the communication system. For the TDD mode, the uplink and downlink data transmissions are interleaved according to time allocation. For FDD, uplink and downlink data are transmitted simultaneously in different frequency bands.

(10) Flexible time slot

According to the type of time domain symbols contained in the time slot, the time slot can be divided into uplink time slot, downlink time slot and flexible time slot. Among them, all time domain symbols in the uplink time slot are uplink time domain symbols, all time domain symbols in the downlink time slot are downlink time domain symbols, and the time domain symbols contained in the flexible time slot are not all uplink time domain symbols Or not all downlink time domain symbols, the flexible time slot may include two or three kinds of uplink symbols, downlink symbols and flexible symbols. For example, a flexible time slot may include downlink time domain symbols and flexible time domain symbols, may also include flexible time domain symbols and uplink time domain symbols, and may also include downlink time domain symbols, flexible time domain symbols and uplink time domain symbols. Wherein, the uplink time domain symbols are used for uplink transmission, the downlink symbols are used for downlink transmission, and the flexible symbols can be used for uplink transmission or downlink transmission. In one frame, different numbers of uplink time slots, downlink time slots and flexible time slots can be configured according to the requirements of different uplink and downlink service rates. Table 1 is a schematic diagram of a common TDD frame structure.

Table 1 An example of the ratio of uplink and downlink time slots in the TDD frame structure

S means a flexible time slot, also known as a special time slot, D means a downlink time slot, and U means an uplink time slot. Usually, the uplink and downlink switching is performed in the S time slot. Among them, the S time slot contains downlink time domain symbols, flexible time domain symbols and upstream time-domain symbols.

In combination with the foregoing network architecture, a method for determining a nonlinear characteristic parameter of a power amplifier provided in an embodiment of the present application is described below. Please refer to FIG. 3 . FIG. 3 is a schematic flowchart of a method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application. Among them, Figure 3 illustrates the downlink transmission as an example, that is, the sending end is a network device, the receiving end is a terminal, the first reference signal and the second reference signal are transmitted from the network side to the terminal side, and the terminal side performs the power transmission of the network side. Estimation of nonlinear characteristics of amplifiers. The functions performed by the terminal in this embodiment may also be performed by modules (eg, chips) in the terminal, and the functions performed by the network device in this application may also be performed by modules (eg, chips) in the network device. As shown in FIG. 3 , the method for determining nonlinear characteristic parameters of a power amplifier may include the following steps.

Step S301: the network device sends the first reference signal and the second reference signal to the terminal on at least one first frequency band,

Correspondingly, the terminal receives the first reference signal and the second reference signal from the network device on at least one first frequency band. The first reference signal corresponds to the first transmission power, the reference signal corresponds to the first transmission power, and at least one first frequency band is a frequency band that the terminal supports post-distortion processing and belongs to the first frequency band set.

Specifically, the first reference signal is sent by the network device using the first transmit power, the second reference signal is sent by the network device using the second transmit power, the first transmit power is less than the first threshold, and the second transmit power is greater than or equal to the first threshold . Wherein, the first threshold may be a power threshold value of the input signal that distorts the output signal of the power amplifier, and the power threshold value may also be understood as a critical value. When the power of the input signal is less than the first threshold, the power of the output signal changes linearly with the power of the input signal, and when the power of the input signal is greater than or equal to the first threshold, the power of the output signal no longer changes linearly, or It is said that when the power of the input signal is greater than or equal to the first threshold, the output signal is distorted. For example, the first threshold is 40mW, and the transmission power of the first reference signal is less than 40mW, then the transmission power of the first reference signal does not fall within the distortion range of the power amplifier model on the network side, the first reference signal does not undergo distortion, and the second reference signal If the transmission power of the second reference signal is greater than 40 mW, the transmission power of the second reference signal falls within the distortion range of the power amplifier model on the network side, and the second reference signal is distorted.

When there is a first frequency band, the network device can transmit a first reference signal and a second reference signal on the first frequency band, or in other words, the network device can transmit a set of reference signals on the first frequency band, a set of The reference signals include a first reference signal and a second reference signal.

When there are N first frequency bands, the network device sends a first reference signal and a second reference signal to the terminal on each of the N first frequency bands respectively, or in other words, the network device sends A group of reference signals is sent to the terminal on each of the N first frequency bands, where the group of reference signals includes a first reference signal and a second reference signal. The first sending powers of the N first reference signals respectively sent on the N first frequency bands may be the same or different. For example, if the terminal supports post-distortion processing in both frequency band A and frequency band B, the network device can use the transmission power of 36mW on frequency band A to send the first reference signal to the terminal, and use the transmission power of 37mW on frequency band B to send the first reference signal to the terminal. Signal.

The transmission powers of the first reference signal and the second reference signal are different. Optionally, the first reference signal and the second reference signal may also satisfy at least one of the following modes:

Mode 1, the modulation mode of the second reference signal is different from that of the first reference signal. For example, on the first frequency range (frequency range1, FR1), the modulation order of the first reference signal is not greater than 4, and the modulation order of the second reference signal is not less than 6. For another example, in the second frequency range (frequency range2, FR2), the modulation order of the first reference signal is not greater than 2, and the modulation order of the second reference signal is not less than 4.

In a second manner, the time domain resources occupied by the second reference signal and the first reference signal are different. For example, the first reference signal and the second reference signal are reference signals sent by the network device at intervals of N OFDM symbols, N is a non-zero integer, and the interval of N OFDM symbols represents the time domain resource occupied by the first reference signal. The interval between the end point and the start point of the time domain resource occupied by the second reference signal. When N is a positive integer, it can mean that the first reference signal is in front and the second reference signal is in the back; when N is a negative integer, it can mean that the first reference signal is in the back and the second reference signal is in the front, and the time domain resources include At least one OFDM symbol. When multiple terminals access the same network device, the time-domain resources occupied by the multiple first reference signals and the multiple second reference signals are the same, and the occupied frequency-domain resources are different.

Mode 3, the type of the second reference signal and the first reference signal may be the same or different. The first reference signal may be CSI-RS/DMRS, and the second reference signal may be CSI-RS/DMRS. For example, both the first reference signal and the second reference signal are DMRS; or, the first reference signal is DMRS, and the second reference signal is CSI-RS; or, the first reference signal is CSI-RS, and the second reference signal is DMRS , the present application does not limit the specific type of the reference signal.

Mode 4, the first reference signal may include a single reference signal repeatedly sent in the time domain, or a reference signal composed of different sequences continuously sent in the time domain. For example, take the downlink transmission as an example. The first reference signal is DMRS. In order to ensure the coverage of information transmission, a repetition/repeat transmission mechanism (repetition) is configured. The sender can configure one or more DMRS for each PDSCH transmission. , the first reference signal in this case is all DMRSs in the PDSCH repeatedly transmitted. In terms of time domain resources, the second reference signal is before or after the first reference signal.

The transmission powers of the first reference signal and the second reference signal are different. Optionally, the scheduling manners of the first reference signal and the second reference signal may be the same or different.

In a possible implementation manner, both the first reference signal and the second reference signal are dynamically scheduled by the network device. Alternatively, the first reference signal is dynamically scheduled by the network device, and the second reference signal is semi-statically scheduled by the network device. Alternatively, both the first reference signal and the second reference signal are semi-persistently scheduled by the network device. In this application, dynamic scheduling may refer to downlink control information (DCI) scheduling. Semi-persistent scheduling can be understood as that information such as the time-frequency position and transmission cycle of the reference signal is configured by the network device through RRC, and when the network device sends the reference signal, it is notified through medium access control (MAC) CE signaling terminal.

In the case that the first reference signal is a downlink DMRS sent by PDSCH, and the second reference signal is also a downlink DMRS sent by PDSCH, the first reference signal can be dynamically scheduled by the network device, and the second reference signal can be semi-statically scheduled by the network device. The time-domain resources occupied by the second reference signal are different from those of the first reference signal, wherein the time-frequency resources occupied by the first reference signal and the second reference signal are different, specifically, they may be different OFDM symbols in the same time unit, or they may be different in time Different symbols of a time unit. In this application, a time unit may be a time slot, a mini-slot, a subframe, etc., and the specific form of the time unit is not limited. Taking the time unit as a time slot as an example, the protocol 38.211 stipulates the number of DMRSs that may be configured for PDSCHs of different lengths and the occupied OFDM symbol positions. Taking a single-symbol DMRS as an example, please refer to Table 2, which is an embodiment of this application A PDSCH DMRS position of a single-symbol DMRS is provided:

Table 2

As shown in Table 2, for the case where one OFDM symbol is configured to carry a DMRS in one time slot: the first reference signal may be configured as a DMRS carried on one OFDM symbol in the first time slot, and the second reference signal may be configured in DMRS carried on one OFDM symbol of the second time slot. The first time slot and the second time slot are different time slots, and optionally, the second time slot may be a time slot next to the first time slot. For example, the terminal may receive the first reference signal at ₁₀ of the first time slot, and receive the second reference signal at ₁₀ of the second time slot.

For the case where multiple OFDM symbols are configured to carry DMRS in one time slot, the first reference signal and the second reference signal can satisfy any of the following methods:

Mode 1: The first reference signal may be a DMRS configured on the first OFDM symbol in the first slot, and the second reference signal may be a DMRS configured in the multiple OFDM symbols in the first slot Except for the first OFDM symbol, the DMRS carried on at least one OFDM symbol among other OFDM symbols. When two OFDM symbols are configured to carry DMRS, the terminal receives the first reference signal in the first OFDM symbol in the time domain sequence of the two OFDM symbols, and the terminal receives the first reference signal in the second OFDM symbol in the time domain sequence in the two OFDM symbols. The symbols receive a second reference signal. That is, the DMRS carried on the first OFDM symbol in the time domain sequence in the two OFDM symbols is the first reference signal, and the DMRS carried on the second OFDM symbol in the time domain sequence in the two OFDM symbols is the first reference signal. reference signal. When two or more OFDM symbols are configured to carry DMRS, the terminal receives the first reference signal at the first OFDM symbol in the time domain sequence among the two or more OFDM symbols, and the terminal receives the first reference signal at the first OFDM symbol in the time domain sequence among the two or more OFDM symbols. The second reference signal is received on at least one OFDM symbol from the second to the last OFDM symbol. For example, the terminal may receive the first reference signal at l ₀ , and receive the second reference signal at l ₀ +n, where n may be configured by high-layer signaling, and l ₀ is the first OFDM symbol among the configured OFDM symbols carrying DMRS. Alternatively, the sequence number difference m between the DMRS signal corresponding to the second reference signal and the DMRS signal corresponding to the first reference signal may be configured by high-layer signaling, where m is a positive integer greater than 0, and the terminal may set the first The DMRS signal is used as the first reference signal, and the m+1 th DMRS signal in the order of the time domain is used as the second reference signal.

In one embodiment, two OFDM symbols are configured to carry DMRS in one time slot, l _d =5 in Table 1, and the positions of the two DMRS are configured at l ₀ and l ₀ +4. At this time, the terminal can receive DMRS as the first reference signal at l ₀ of the first time slot, and n is configured as 4 in high layer signaling, then the terminal receives DMRS at l ₀ +4 of the first time slot as the second reference signal. In one embodiment, one time slot is configured with 3 OFDM symbols to carry DMRS, where l _d =9 in Table 1, and the positions of the 3 DMRS are configured at l ₀ , l ₀ +4 and l ₀ +7. At this time, the terminal can receive DMRS at l ₀ of the first time slot as the first reference signal, and the high-level signaling configures n as 4 or 7, and the terminal can receive the DMRS at l ₀ +4 or l ₀ +7 of the first time slot according to the configured n Receive DMRS as the second reference signal.

In one embodiment, a time slot is configured with 2 OFDM symbols to carry DMRS, the terminal receives 2 DMRS signals in this time slot, and uses the first DMRS signal in the time domain sequence as the first reference signal, according to the high-layer signaling If m is configured as 1, the second DMRS signal in the time domain sequence is used as the second reference signal. It can also be understood that, as l _d =5 in Table 1, the positions of the two DMRSs are configured at l ₀ and l ₀ +4. At this time, the terminal may receive the DMRS at _l0 of the first time slot as the first reference signal, and receive the DMRS at _l0 +4 of the first time slot as the second reference signal. In one embodiment, a time slot is configured with 3 OFDM symbols to carry DMRS, the terminal receives 3 DMRS signals in the time slot, and uses the first DMRS signal in the time domain sequence as the first reference signal, if the high layer signaling If the configured m is 1, the second DMRS signal in the time domain sequence is used as the second reference signal, and if m is configured in high layer signaling as 2, the third DMRS signal in the time domain sequence is used as the second reference signal. It can also be understood that, as l _d =9 in Table 1, the positions of the three DMRSs are configured at l ₀ , l ₀ +4 and l ₀ +7. At this time, the terminal can receive DMRS at l ₀ of the first time slot as the first reference signal. If m is 1 in the high-level signaling configuration, the terminal receives DMRS at l ₀ +4 of the first time slot as the second reference signal. If If m is configured by high-level signaling as 2, then the terminal receives DMRS as the second reference signal at l ₀ +7 of the first time slot.

Mode 2: The first reference signal may be the DMRS configured on the first OFDM symbol in the first slot of the multiple OFDM symbols, and the second reference signal may be configured in the multiple OFDM symbols of the second slot DMRS carried on at least one OFDM symbol. When two OFDM symbols are configured to carry DMRS, the terminal receives the first reference signal in the first OFDM symbol in the time domain sequence of the two OFDM symbols in the first slot, and the terminal receives the first reference signal in the first to second OFDM symbols of the second slot. The second reference signal is received on at least one OFDM symbol in the last OFDM symbol. For example, the terminal may receive the first reference signal at l ₀ , and receive the second reference signal at l ₀ +n, where n may be configured by high-layer signaling, and l ₀ is the first OFDM symbol among the configured OFDM symbols carrying DMRS. Alternatively, the sequence number difference m between the DMRS signal corresponding to the second reference signal and the DMRS signal corresponding to the first reference signal may be configured by high-layer signaling, where m is a positive integer greater than 0, and the terminal may set the first The DMRS signal is used as the first reference signal, and the m+1 th DMRS signal in the order of the time domain is used as the second reference signal.

In one embodiment, two OFDM symbols are configured to carry DMRS in one time slot, l _d =5 in Table 1, and the positions of the two DMRS are configured at l ₀ and l ₀ +4. At this time, the terminal can receive DMRS at l ₀ of the first time slot as the first reference signal, and the high-level signaling configures n as 14 or 18, then the terminal receives DMRS at l ₀ or l ₀ +4 of the second time slot as the second reference signal. reference signal. In one embodiment, one time slot is configured with 3 OFDM symbols to carry DMRS, where l _d =9 in Table 1, and the positions of the 3 DMRS are configured at l ₀ , l ₀ +4 and l ₀ +7. At this time, the terminal can receive DMRS at l ₀ of the first time slot as the first reference signal, and the high-level signaling configures n as 14 or 18 or 25, and the terminal can receive the DMRS at l ₀ or l ₀ +4 of the second time slot according to the configured n Or l ₀ +7 receiving the DMRS as the second reference signal.

In one embodiment, a time slot is configured with 2 OFDM symbols to carry DMRS, the terminal receives 2 DMRS signals in this time slot, and uses the first DMRS signal in the time domain sequence as the first reference signal, according to the high-layer signaling If m is configured as 2, the third DMRS signal in the time domain sequence is used as the second reference signal. It can also be understood that, as l _d =5 in Table 1, the positions of the two DMRSs are configured at l ₀ and l ₀ +4. At this time, the terminal may receive the DMRS _{at 10} of the first time slot as the first reference signal, and receive the DMRS at ₁₀ of the second time slot as the second reference signal. In one embodiment, one time slot is configured with 3 OFDM symbols to carry DMRS, where l _d =9 in Table 1, and the positions of the 3 DMRS are configured at l ₀ , l ₀ +4 and l ₀ +7. The terminal receives 3 DMRS signals in this time slot, and uses the first DMRS signal in the time domain sequence as the first reference signal. If m is 3 in the high layer signaling configuration, then uses the fourth DMRS signal in the time domain sequence as the first reference signal. For the second reference signal, if m is 4 in the high-level signaling configuration, the fifth DMRS signal in the time domain sequence is used as the second reference signal; if m is 5 in the high-layer signaling configuration, the sixth DMRS signal in the time domain sequence is used as the second reference signal. A DMRS signal is used as the second reference signal. It can also be understood that, as l _d =9 in Table 1, the positions of the three DMRSs are configured at l ₀ , l ₀ +4 and l ₀ +7. At this time, the terminal can receive DMRS as the first reference signal at ₁₀ of the first time slot. If m is 3 in the high-layer signaling configuration, the terminal receives _DMRS as the second reference signal at Let the configured m be 4, then the terminal receives DMRS as the second reference signal at l ₀ +4 of the second time slot, and if the m configured by high-level signaling is 5, the terminal receives the DMRS at l ₀ +7 of the second time slot DMRS is used as the second reference signal.

On the premise that the position of the second reference signal is configured by high-layer signaling, the terminal can determine whether the PDSCH scheduled by the DCI contains the second reference signal according to the identification bit in the DCI, and whether to perform nonlinear characteristic parameter estimation. Optionally, the format of the DCI may be format1_1.

In the case that the first reference signal is a reference signal of a known sequence at the receiving end and the second reference signal is a data signal unknown at the receiving end, the first reference signal can be dynamically scheduled by the network device, and the second reference signal can be half-timed by the network device. Static scheduling. Wherein, the second reference signal may be a reference signal modulated by quadrature phase shift keying (quadrature phase shift keying, QPSK) or a higher order modulation manner. The network device may configure the sending period and time-domain resource location of the first reference signal through high-layer signaling.

Optionally, when the network device and the terminal work in a time division duplex (time division duplex, TDD) mode, the first reference signal may be configured to be sent at the switching point of the uplink and downlink in the TDD uplink and downlink time slot mode. For example, if the first reference signal and the second reference signal both occupy the S time slot, then the terminal device can use the measurement result on the D time slot to post-process the received signal to improve the demodulation performance of downlink data.

For example, in the case where the first reference signal is a downlink DMRS transmitted by the PDSCH and the second reference signal is a data signal transmitted by the PDSCH, the second reference signal may be configured as the PDSCH closest to the time domain resource occupied by the first reference signal. For example, please refer to FIG. 4 . FIG. 4 is a schematic diagram of time-domain resource locations of a first reference signal and a second reference signal provided by an embodiment of the present application. As shown in Figure 4, under the DDDSU time slot structure, the subcarrier spacing of the current TDD carrier is 15kHz (the time slot length is 1ms), and the uplink and downlink time slot mode is 'DDDSU' (the uplink and downlink time slot mode period is 5ms), The network device configures the sending period of the first reference signal as 5 ms, and the occupied time domain resource is located in the S time slot. The network device schedules the PDSCH in both the second and third downlink time slots, and the terminal determines that the second reference signal is the PDSCH in the third downlink time slot according to the principle of "the PDSCH closest to the first reference signal".

In the case where both the first reference signal and the second reference signal are reference signals of a known sequence at the transceiver end, the first reference signal may be semi-persistently scheduled by the network device, and the second reference signal may be semi-persistently scheduled by the network device. The network device needs to configure the sending period and time-domain resource location of the first reference signal and the second reference signal through high-layer signaling.

Optionally, when the network device and the terminal work in the TDD mode, the first reference signal and the second reference signal may be configured to be sent at the switching point of the uplink and downlink in the TDD uplink and downlink time slot mode. For example, if the first reference signal and the second reference signal both occupy the S time slot, then the terminal device can use the measurement result to process the received signal in the D time slot, so as to improve the demodulation performance of downlink data.

Step S302: the terminal determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal.

After receiving the first reference signal and the second reference signal from the network device on the at least one first frequency band, the terminal may determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal. Specifically, the terminal may perform channel estimation according to the first reference signal, and then determine the nonlinear characteristic parameters of the power amplifier according to the second reference signal; or, the terminal may first determine the nonlinear characteristic parameters of the power amplifier according to the second reference signal, and then determine the nonlinear characteristic parameters of the power amplifier according to the second reference signal. A reference signal is used to perform channel estimation; or, the terminal simultaneously determines the nonlinear characteristic parameter of the power amplifier according to the first reference signal and the second reference signal. In practical applications, different implementations may be selected according to different algorithms. In this application, there is no restriction on the order in which the terminal uses the first reference signal and the second reference signal.

In an implementation manner: the terminal may first perform channel estimation according to the first reference signal to obtain channel state information, and then determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the channel state information and the second reference signal. In this way, the channel estimation is performed first according to the first reference signal, and the obtained channel state information is accurate, and then the nonlinear characteristic parameters of the power amplifier are determined according to the accurate channel state information and the second reference signal, which can improve the accuracy of determining the nonlinear characteristic parameters of the power amplifier. sex. For example, the terminal uses the first reference signal to perform channel estimation:

y(n)=H×x _A +n

Among them, y(n) is the output signal of the power amplifier, H is the channel estimation, x _A is the first reference signal received at the current moment, n is white noise, and the channel estimation result H′ can be obtained:

The terminal uses the channel estimation result H′ obtained through the first reference signal and the second reference signal x _B to estimate the nonlinear feature α:

In the above-mentioned embodiments, the network device schedules the first reference signal and/or the second reference signal through DCI, which can make the time-frequency position of the first reference signal and/or the second reference signal flexible and configurable; the network device uses RRC or MAC CE Scheduling the first reference signal and/or the second reference signal can make the period of the first reference signal and/or the second reference signal flexible and configurable, therefore, the flexibility of scheduling the first reference signal and the second reference signal can be improved . The terminal side estimates the nonlinear characteristics of the power amplifier on the network side. By decoupling the channel estimation and the nonlinear characteristic estimation, the accuracy of the nonlinear characteristic estimation can be improved under the premise of ensuring the accuracy of the channel estimation.

In combination with the foregoing network architecture, another method for determining a nonlinear characteristic parameter of a power amplifier provided in an embodiment of the present application is described below. Please refer to FIG. 5 . FIG. 5 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided by an embodiment of the present application. Among them, Figure 5 illustrates the downlink transmission as an example, that is, the sending end is a network device, the receiving end is a terminal, the first reference signal and the second reference signal are transmitted from the network side to the terminal side, and the terminal side performs the power transmission of the network side. Estimation of nonlinear characteristics of amplifiers. As shown in Fig. 5, the method for determining nonlinear characteristic parameters of a power amplifier may include the following steps. Wherein, step S502 is optional.

Step S501: The terminal sends at least one of the first set of frequency bands, the maximum distortion order of the terminal, or the maximum delay supported by the terminal to the network device. Correspondingly, the network device receives the first set of frequency bands and the maximum distortion order of the terminal from the terminal. at least one of the number or the maximum latency supported by the terminal.

The terminal can first judge whether post-distortion processing is performed for each frequency band according to a predefined criterion:

When the modulation order of the transmission signal on the second frequency band is greater than or equal to the second threshold, the terminal determines that the second frequency band supports post-distortion processing, and the second frequency band is any frequency band in the first frequency band set, for example, the second threshold is 4 or 6, or other numerical values, wherein the transmission signal may be a reference signal or a data signal.

After determining whether post-distortion processing is performed for each frequency band, the terminal reports the first frequency band set including at least one first frequency band that supports post-distortion processing, and the reporting method can meet any of the following:

Mode 1, the terminal can report the capability of distorted processing after the set of frequency bands is reported. For example, the terminal reports that the FR1 set does not support the post-distortion processing capability, and the second frequency range FR2 set supports the post-distortion processing capability.

In the second manner, the terminal may report the post-distortion processing capability in each frequency band in the frequency band set. For example, the terminal reports that the first, third, and fifth frequency bands in the FR1 set do not support post-distortion processing capabilities, and the second, fourth, and sixth frequency bands in the FR1 set support post-distortion processing capabilities, FR2 The first frequency band, the third frequency band, and the fifth frequency band in the set do not support post-distortion processing capability, the second frequency band, fourth frequency band, and sixth frequency band in the FR2 set support post-distortion processing capability, and so on. Compared with the overall reporting of the FR1 set or FR2 set, the way of reporting each frequency band in the set makes the terminal's ability to report the post-distortion processing of each frequency band more accurate.

In addition to reporting the first frequency band set, the terminal may also report the maximum distortion order of the terminal and/or the maximum delay supported by the terminal. The types of power amplifier models are divided into power amplifier models without memory and power amplifier models with memory. If it is a power amplifier model without memory, the terminal can report the highest distortion order supported by the terminal; if it is a power amplifier model with memory, the terminal can report the highest distortion order and maximum delay supported by the terminal.

Further optionally, the network device may determine the type of the power amplifier model in a frequency band that supports post-distortion processing according to the maximum distortion order of the terminal and/or the maximum delay supported by the terminal reported by the terminal. Alternatively, the terminal may directly report the type of the power amplifier model of each frequency band that supports post-distortion processing.

For example, the terminal supports the first frequency band in FR1 (such as frequency band n78 in FR1, with a center frequency of 3.5 GHz), and supports the second frequency band in FR2 (such as frequency band n257 in FR2, with a center frequency of 28 GHz). The terminal can report the following content on the first frequency band in FR1 and the second frequency band in FR2 respectively:

1. Whether to support post-distortion processing;

2. On the premise of supporting post-distortion processing, support the power amplifier model without memory or support the power amplifier model with memory;

3. Under the premise of supporting the memoryless power amplifier model, the highest distortion order supported;

4. Under the premise of supporting the power amplifier model with memory, the highest distortion order and maximum delay supported.

table 3

频带frequency band	后失真处理位Post Distortion Bits	功率放大器模型位Power Amp Model Bits	最大失真阶数字段Maximum Distortion Stage field	最大延迟量字段Maximum delay field
n78n78	11	00	011011	000000
n257n257	11	11	011011	010010

As shown in Table 3, a possible reporting signaling format, the post-distortion processing bit can indicate whether the terminal supports post-distortion processing on the current frequency band, for example, a value of 0 means no support, and a value of 1 means support. The power amplifier model bit can indicate the power amplifier model supported by the terminal. For example, a value of 0 means that only the memoryless power amplifier model is supported for post-distortion processing, a value of 1 means that both memoryless and memory power amplifier models are supported, and a value of 2 Delegates only support post-distortion with memory PA models. The maximum distortion order field may indicate the maximum distortion order D supported by the terminal, and the field is fixed at 3 bits. The maximum delay field can indicate the maximum delay Q supported by the terminal, and the field is fixed at 3 bits.

The terminal may carry the first frequency band set, the maximum distortion order of the terminal and/or the maximum delay supported by the terminal in uplink control information (uplink control information, UCI) or physical uplink shared channel (physical uplink shared channel, PDSCH) in the PUCCH )middle.

For the n78 frequency band, the terminal supports post-distortion processing, and only supports the memoryless power amplifier model using D=3. According to the definition of the memoryless power amplifier model, the vector [α ₁ ,α ₃ ,α ₅ ] can represent the terminal in n78 Memoryless power amplifier model used on frequency band. Similarly, for the n257 frequency band, the terminal supports post-distortion processing, and supports the use of D=3 memoryless power amplifier model, or D=3, Q=2 memory power amplifier model, the following vector/matrix can be used to characterize the terminal in n257 Power amplifier models used on frequency bands:

[α ₁ ,α ₃ ,α ₅ ], or

For the low frequency band, the memoryless power amplifier model can accurately characterize the nonlinear characteristics of the device, and there is no need to use the memory power amplifier model with high computational complexity and storage overhead; for the high frequency band, the memoryless power amplifier model is not accurate enough . Therefore, the differentiated capability reporting and parameter configuration for different frequency bands can avoid excessive overhead while satisfying the nonlinear estimation accuracy of different frequency bands.

Step S502: The network device sends to the terminal first indication information for instructing the terminal to determine the nonlinear characteristic parameters of the power amplifier on at least one first frequency band, and correspondingly, the terminal receives information from the network device for instructing the terminal to determine the non-linear characteristic parameters of the power amplifier in at least one first frequency band. The first indication information for determining the nonlinear characteristic parameter of the power amplifier on the frequency band.

When the first frequency band set includes a first frequency band, the network device may use the first indication information to instruct the terminal to determine the nonlinear characteristic parameter of the power amplifier of the first frequency band. After receiving the first indication information, the terminal determines the nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal. When the first frequency band includes multiple first frequency bands, the network device may instruct the terminal to determine a power amplifier nonlinear characteristic parameter of a certain first frequency band among the multiple first frequency bands.

Optionally, if the terminal does not receive the first indication information issued by the network device, when receiving the first reference signal and the second reference signal, the terminal may also determine the nonlinear characteristic parameters of the power amplifier by itself.

Step S503: the network device sends the first reference signal and the second reference signal to the terminal on at least one first frequency band.

It should be understood that step S603 corresponds to step S301, and related descriptions in step S603 may refer to the description of step S301 above, and details are not repeated here to avoid repetition.

Step S504: the terminal determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal.

In a possible implementation manner, after receiving the first indication information issued by the network device, the terminal determines at least one nonlinear characteristic of the power amplifier in the first frequency band according to the first indication information, the first reference signal and the second reference signal parameter.

In another possible implementation manner, the terminal does not receive the first indication information issued by the network device, and when receiving the first reference signal and the second reference signal, it determines by itself according to the first reference signal and the second reference signal Non-linear characteristic parameters of the power amplifier on at least one first frequency band.

The terminal determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal:

The terminal may determine at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal, the second reference signal, the maximum distortion order of the terminal, and the power amplifier model, or the terminal may determine the nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal, the second The reference signal, the maximum delay supported by the terminal, and the power amplifier model determine at least one non-linear characteristic parameter of the power amplifier on the first frequency band, or the terminal may determine the first reference signal, the second reference signal, the maximum distortion order of the terminal, and the terminal The supported maximum delay and power amplifier models determine power amplifier non-linear characteristic parameters in at least one first frequency band.

The power amplifier model is divided into a power amplifier model without memory and a power amplifier model with memory. Wherein, the power amplifier model without memory includes the nonlinear characteristic parameters of the power amplifier and the maximum distortion order of the terminal, and the power amplifier model with memory includes the nonlinear characteristic parameters of the power amplifier, the maximum distortion order of the terminal and the maximum delay supported by the terminal. When the terminal determines the nonlinear characteristic parameter of the power amplifier on at least one first frequency band, it may be based on the type of power amplifier model (memoryless power amplifier model and/or memory power amplifier model) supported by each first frequency band. For example, the terminal supports post-distortion processing in frequency band A, frequency band B, and frequency band C, and frequency band A supports a memoryless power amplifier model. The terminal can use the first reference signal, the second reference signal, the maximum distortion order of the terminal and the memoryless power amplifier model The power amplifier model determines the nonlinear characteristic parameters of the power amplifier on frequency band A; frequency band B supports a memoryless power amplifier model and a memory power amplifier model, and if the memoryless power amplifier model is used, the terminal can use the first reference signal, the second reference The maximum distortion order of the signal and the terminal and the memoryless power amplifier model determine the nonlinear characteristic parameters of the power amplifier on the frequency band B. If the power amplifier model with memory is used, the terminal can use the first reference signal, the second reference signal, the terminal The maximum distortion order, the maximum delay supported by the terminal, and the power amplifier model with memory determine the nonlinear characteristic parameters of the power amplifier on frequency band B; frequency band C supports the power amplifier model with memory, and the terminal can base on the first reference signal, the second reference The signal, the maximum distortion order of the terminal, the maximum delay supported by the terminal and the power amplifier model with memory determine the nonlinear characteristic parameters of the power amplifier on the frequency band C.

In one embodiment, the first reference signal is an undistorted reference signal, and the terminal can first perform channel estimation based on the first reference signal to obtain channel state information; the second reference signal is a distorted reference signal, and then according to the channel state information and the second The two reference signals determine at least one nonlinear characteristic parameter of the power amplifier in the first frequency band.

If the power amplifier model is a memoryless power amplifier model, the formula for determining the nonlinear characteristic parameters of the power amplifier can be:

Among them, y(n) is the output signal of the power amplifier, H is the channel estimation, x _A is the first reference signal received at the current moment, n is white noise, and the channel estimation result H′ can be obtained, and x _B is the received signal at the current moment The second reference signal obtained, D is the maximum distortion order of the terminal.

If the power amplifier model is a power amplifier model with memory, the formula for determining the nonlinear characteristic parameters of the power amplifier can be:

Among them, Q is the maximum delay supported by the terminal.

Step S505: the terminal sends the nonlinear characteristic parameters of the power amplifier to the network device, and correspondingly, the network device receives the nonlinear characteristic parameters of the power amplifier from the terminal.

After determining the nonlinear characteristic parameters of the power amplifier according to the first reference signal and the second reference signal, the terminal may report the nonlinear characteristic parameters of the power amplifier to the network device, enabling the network device to perform pre-distortion processing on the transmitted signal.

In a possible implementation manner, the terminal may carry the nonlinear characteristic parameter of the power amplifier in the PUSCH and report it to the network device.

Step S506: The network device performs pre-distortion processing on the first signal according to the nonlinear characteristic parameters of the power amplifier to obtain the second signal.

After the network device receives the nonlinear characteristic parameters of the power amplifier from the terminal, if the network device wants to send a signal to the terminal on at least one first frequency band, it may first perform pre-distortion processing on the transmitted signal according to the nonlinear characteristic parameter of the power amplifier, and then pre-distort the signal to the terminal. The distorted signal is sent to the terminal. For example, the network device may perform pre-distortion processing on the first signal according to the nonlinear characteristic parameter of the power amplifier to obtain the second signal.

Step S507: the network device sends the second signal to the terminal, and correspondingly, the terminal receives the second signal from the network device.

After the network device performs pre-distortion processing on the first signal according to the nonlinear characteristic parameter of the power amplifier to obtain the second signal, it sends the second signal to the terminal. After receiving the second signal, the terminal normally demodulates the second signal.

In the foregoing embodiments, the estimation of the nonlinear characteristics of the power amplifier on the network side by the terminal side can be realized. By decoupling channel estimation and nonlinear feature estimation, the accuracy of nonlinear feature estimation can be improved while ensuring the accuracy of channel estimation. In the communication between the network equipment and the terminal, the network equipment can pre-distort the signal according to the nonlinear characteristic parameters of the power amplifier, so that the terminal demodulates the signal more accurately, improves the demodulation performance of the terminal, and then increases the peak rate of the communication system .

In combination with the foregoing network architecture, another method for determining a nonlinear characteristic parameter of a power amplifier provided in an embodiment of the present application is described below. Please refer to FIG. 6 . FIG. 6 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application. Among them, Figure 6 illustrates the downlink transmission as an example, that is, the sending end is a network device, the receiving end is a terminal, the first reference signal and the second reference signal are transmitted from the network side to the terminal side, and the terminal side performs the power transmission of the network side. Estimation of nonlinear characteristics of amplifiers. The functions performed by the terminal in this embodiment may also be performed by modules (eg, chips) in the terminal, and the functions performed by the network device in this application may also be performed by modules (eg, chips) in the network device. As shown in Fig. 6, the method for determining nonlinear characteristic parameters of a power amplifier may include the following steps. Wherein, step S602 and step S606 are optional.

Step S601: the terminal sends at least one of the first frequency band set, the maximum distortion order of the terminal, or the maximum delay supported by the terminal to the network device.

It should be understood that step S601 corresponds to step S501, and the relevant description in step S601 may refer to the description of step S501 above, and details are not repeated here to avoid repetition.

Step S602: the network device sends to the terminal first indication information for instructing the terminal to determine the nonlinear characteristic parameter of the power amplifier on at least one first frequency band.

It should be understood that step S602 corresponds to step S502, and for related descriptions in step S602, refer to the description of step S502 above, and details are not repeated here to avoid repetition.

Step S603: the network device sends the first reference signal and the second reference signal to the terminal on at least one first frequency band.

Step S604: the terminal determines at least one nonlinear characteristic parameter of the power amplifier in the first frequency band according to the first reference signal and the second reference signal.

It should be understood that step S604 corresponds to step S504, and the relevant description in step S604 may refer to the description of step S504 above, and details are not repeated here to avoid repetition.

Step S605: the network device sends a third signal to the terminal, and correspondingly, the terminal receives the third signal from the network device.

Step S606: The network device sends to the terminal second instruction information for instructing the terminal to perform post-distortion processing on the third signal, and correspondingly, the terminal receives second instruction information from the network device for instructing the terminal to perform post-distortion processing on the third signal. Instructions.

After determining at least one nonlinear characteristic parameter of the power amplifier in the first frequency band, the terminal may perform post-distortion processing on the signal sent by the network device in the frequency band, that is, perform distortion compensation on the signal. It is also possible not to perform distortion compensation on the signal. In such a case, the network device may send the second indication information to the terminal, instructing the terminal to perform post-distortion processing on the received signal on at least one first frequency band, and the terminal will perform post-distortion processing on the received signal only after receiving the second indication information. operation of distortion compensation.

Optionally, the second indication information may be DCI. The terminal determines whether to perform post-distortion processing according to the frequency band scheduled by the DCI and the modulation order (modulation order) corresponding to the modulation coding scheme (modulation coding scheme, MCS) indicated in the DCI. For example, when the frequency band belongs to FR1, if the modulation order is 6 (64QAM) or higher, post-distortion processing is performed, otherwise no processing is performed; when the frequency band belongs to FR2, if the modulation order is 4 (16QAM) or higher, Then carry out post-distortion processing, otherwise do not process.

Step S607: the terminal performs post-distortion processing on the third signal according to the nonlinear characteristic parameters of the power amplifier to obtain the fourth signal.

In a possible implementation manner, when the terminal receives the second indication information, it may perform post-distortion processing on the third signal according to the nonlinear characteristic parameter of the power amplifier to obtain the fourth signal, and demodulate the fourth signal. The terminal performs post-distortion processing on the signal according to the second instruction information of the network device, instead of performing post-distortion processing on the signal all the time, enabling the terminal to perform post-distortion processing according to actual transmission requirements, and reducing terminal overhead.

In another possible implementation manner, when the terminal does not receive the second indication information, it may also determine whether to perform processing on the third signal according to the post-distortion processing capabilities of the frequency bands receiving the first reference signal and the second reference signal. post-distortion processing. Specifically, when the modulation order of the transmission signal on the frequency band is greater than or equal to the second threshold, it is determined that the frequency band supports post-distortion processing, for example, the second threshold is 4 or 6, or other values, then the post-distortion processing is performed on the third signal The fourth signal is obtained through distortion processing, and the fourth signal is demodulated. The terminal performs post-distortion processing on the signal according to the post-distortion processing capability of the frequency band, instead of performing post-distortion processing on the signal all the time, enabling the terminal to perform post-distortion processing according to actual transmission requirements, and reducing terminal overhead.

In the foregoing embodiments, the estimation of the nonlinear characteristics of the power amplifier on the network side by the terminal side can be realized. By decoupling channel estimation and nonlinear feature estimation, the accuracy of nonlinear feature estimation can be improved while ensuring the accuracy of channel estimation. In the communication between the network equipment and the terminal, the terminal can perform post-distortion processing on the signal according to the nonlinear characteristic parameters of the power amplifier, so that the terminal demodulates the signal more accurately, improves the demodulation performance of the terminal, and then increases the peak rate of the communication system.

It can be understood that the flow of the method for determining the nonlinear characteristic parameters of the power amplifier shown in FIG. 3 is also applicable to the specific implementation of uplink transmission. That is, the transmitting end is a terminal, and the receiving end is a network device, the first reference signal and the second reference signal are transmitted from the terminal to the network device, and the network device performs nonlinear characteristic estimation of the power amplifier on the terminal side. Please refer to FIG. 7 . FIG. 7 is a schematic flowchart of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application. The functions performed by the terminal in this embodiment may also be performed by modules (eg, chips) in the terminal, and the functions performed by the network device in this application may also be performed by modules (eg, chips) in the network device. As shown in FIG. 7 , the method for determining nonlinear characteristic parameters of a power amplifier may include the following steps.

Step S701: the terminal sends the first reference signal and the second reference signal to the network device on at least one first frequency band, and correspondingly, the network device receives the first reference signal and the second reference signal from the terminal on at least one first frequency band .

For the description of the uplink transmission in step S701, reference may be made to the description of the downlink transmission in step S301 above, and to avoid repetition, details are not repeated here.

In addition, the types of the second reference signal and the first reference signal in manner three may be the same or different. The first reference signal may be PTRS/SRS/DMRS, and the second reference signal may be PTRS/SRS/DMRS. For example, both the first reference signal and the second reference signal are DMRS; or, the first reference signal is DMRS, and the second reference signal is PTRS/SRS; or, the first reference signal is PTRS/SRS, and the second reference signal is DMRS , the present application does not limit the specific type of the reference signal.

In the case that the first reference signal is an uplink DMRS sent by PUSCH, and the second reference signal is also an uplink DMRS sent by PUSCH, the first reference signal may be dynamically scheduled by the network device, and the second reference signal may be semi-statically scheduled by the network device. The time-domain resources occupied by the second reference signal are different from those of the first reference signal, wherein the time-frequency resources occupied by the first reference signal and the second reference signal are different, specifically, they may be different OFDM symbols in the same time unit, or they may be different in time Different symbols of a time unit. In this application, a time unit may be a time slot, a mini-slot, a subframe, etc., and the specific form of the time unit is not limited. Taking the time unit as a time slot as an example, the protocol 38.211 stipulates the number of DMRSs that may be configured for PUSCHs of different lengths and the occupied OFDM symbol positions. Taking a single-symbol DMRS as an example, please refer to Table 4, which is an embodiment of this application A PUSCH DMRS position of a single-symbol DMRS is provided:

Table 4

For the dynamic scheduling manner of the first reference signal and the second reference signal, reference may be made to the description in step S301, and details are not repeated here to avoid repetition.

Step S702: The network device determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal.

After the network device receives the first reference signal and the second reference signal from the terminal on the at least one first frequency band, it may determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal. For specific implementation, refer to the description of the terminal determining at least one nonlinear characteristic parameter of the power amplifier in the first frequency band according to the first reference signal and the second reference signal in step S302 above. To avoid repetition, details are not repeated here.

Optionally, the network device may configure the transmit power difference between the first reference signal and the second reference signal for the terminal according to high-layer signaling. For example, the network device sends fourth indication information to the terminal, where the fourth indication information is used to indicate the transmission power difference between the first reference signal and the second reference signal, and the terminal can select the frequency band corresponding to the first frequency band set according to the transmission power difference above, use the first transmit power to send the first reference signal to the network device, and use the second transmit power to send the second reference signal to the network device, so that the first transmit power is less than the first threshold, and the second transmit power is greater than or equal to the first threshold.

Optionally, the network device may configure the first threshold according to high-level signaling.

In the above embodiment, the terminal can enable the network side to estimate the nonlinear characteristics of the power amplifier on the terminal side through the first reference signal and the second reference signal that are flexibly configurable in time-frequency position and period. By decoupling channel estimation and nonlinear feature estimation, the accuracy of nonlinear feature estimation can be improved while ensuring the accuracy of channel estimation.

It can be understood that the flow of the method for determining the nonlinear characteristic parameters of the power amplifier shown in FIG. 5 and FIG. 6 is also applicable to the specific implementation of uplink transmission. That is, the transmitting end is a terminal, and the receiving end is a network device, the first reference signal and the second reference signal are transmitted from the terminal to the network device, and the network device performs nonlinear characteristic estimation of the power amplifier on the terminal side. Please refer to FIG. 8 and FIG. 9 . FIG. 8 and FIG. 9 are schematic flowcharts of another method for determining nonlinear characteristic parameters of a power amplifier provided in an embodiment of the present application. The functions performed by the terminal in this embodiment may also be performed by modules (eg, chips) in the terminal, and the functions performed by the network device in this application may also be performed by modules (eg, chips) in the network device. As shown in FIG. 8 , the method for determining nonlinear characteristic parameters of a power amplifier may include the following steps. Wherein, step S802 is optional.

Step S801: the terminal sends the first frequency band set to the network device, and correspondingly, the network device receives the first frequency band set from the terminal.

For the description of the uplink transmission in step S801, reference may be made to the description of the downlink transmission in step S501 above, and to avoid repetition, details are not repeated here.

Step S802: The terminal sends to the network device third indication information for instructing the terminal to determine the nonlinear characteristic parameters of the power amplifier on at least one first frequency band, and correspondingly, the network device receives the third indication information from the terminal for instructing the terminal to determine the non-linear characteristic parameters of the power amplifier in at least one first frequency band. The third indication information for determining the nonlinear characteristic parameter of the power amplifier on the frequency band.

When the first frequency band set includes a first frequency band, the terminal may use the third indication information to instruct the network device to determine the nonlinear characteristic parameter of the power amplifier of the first frequency band. After receiving the third indication information, the network device determines the nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal. When the first frequency band includes multiple first frequency bands, the terminal may instruct the network device to determine a power amplifier nonlinear characteristic parameter of a certain first frequency band among the multiple first frequency bands.

Optionally, if the network device does not receive the third indication information sent by the terminal, when the first reference signal and the second reference signal are received, the network device may also determine the nonlinear characteristic parameters of the power amplifier by itself.

Step S803: the network device sends to the terminal fourth indication information for indicating the transmission power difference between the first reference signal and the second reference signal, and correspondingly, the terminal receives the fourth indication information from the network device for indicating the first reference signal and the second reference signal Fourth indication information of the transmission power difference between the two reference signals.

The network device may configure the transmit power difference between the first reference signal and the second reference signal for the terminal according to high-layer signaling. The terminal may use the first transmission power to send the first reference signal to the network device on the frequency band corresponding to the first frequency band set according to the transmission power difference, and use the second transmission power to send the second reference signal to the network device, so that the first transmission power is less than the first threshold, and the second transmit power is greater than or equal to the first threshold.

Step S804: the terminal sends the first reference signal and the second reference signal on at least one first frequency band according to the fourth indication information.

It should be understood that step S804 corresponds to step S701, and for related descriptions in step S804, refer to the description of step S701 above, and details are not repeated here to avoid repetition.

Step S805: The network device determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal.

It should be understood that step S805 corresponds to step S702, and for related descriptions in step S805, refer to the description of step S702 above, and details are not repeated here to avoid repetition.

Step S806: the network device sends the nonlinear characteristic parameters of the power amplifier to the terminal, and accordingly, the terminal receives the nonlinear characteristic parameters of the power amplifier from the network device.

After the network device determines the nonlinear characteristic parameters of the power amplifier according to the first reference signal and the second reference signal, it may send at least one nonlinear characteristic parameter of the power amplifier on the first frequency band to the terminal through the first signaling, and may also use the first signaling The second signaling instructs the terminal to use a certain nonlinear characteristic parameter of the power amplifier in the at least one nonlinear characteristic parameter of the power amplifier on the first frequency band.

Optionally, the first signaling may be an RRC parameter carried in the PDSCH. The second signaling can be the MAC CE carried in the PDSCH, or the DCI carried in the PDCCH. For example, the RRC parameters include at least one set of non-linear characteristic parameters of power amplifiers reported by each terminal that may be used in frequency bands (n78/n257...) that support post-distortion processing. In MAC CE, a set of nonlinear characteristic parameters of power amplifiers used on each frequency band is indicated, or DCI may indicate a set of power amplifiers in at least one set of nonlinear characteristic parameters of power amplifiers configured by RRC signaling on the current frequency band Nonlinear feature parameters.

The network device can flexibly switch among multiple sets of pre-configured nonlinear characteristic parameters, and more accurately match the changing nonlinear characteristic parameters of the power amplifier.

Step S807: The terminal performs pre-distortion processing on the fifth signal according to the nonlinear characteristic parameter of the power amplifier to obtain the sixth signal.

After the terminal receives the nonlinear characteristic parameters of the power amplifier from the network device, if the terminal wants to send a signal to the network device on at least one first frequency band, it may first perform pre-distortion processing on the transmitted signal according to the nonlinear characteristic parameters of the power amplifier, and then pre-distort the transmitted signal. The distorted signal is sent to network equipment. For example, the terminal performs predistortion processing on the fifth signal according to the nonlinear characteristic parameter of the power amplifier to obtain the sixth signal.

Step S808: the terminal sends a sixth signal to the network device, and correspondingly, the network device receives the sixth signal from the terminal.

After the terminal performs predistortion processing on the fifth signal according to the nonlinear characteristic parameter of the power amplifier to obtain the sixth signal, the terminal sends the sixth signal to the network device. After receiving the sixth signal, the network device normally demodulates the sixth signal.

In the foregoing embodiments, the estimation of the nonlinear characteristics of the power amplifier at the terminal side by the network side can be implemented. By decoupling channel estimation and nonlinear feature estimation, the accuracy of nonlinear feature estimation can be improved while ensuring the accuracy of channel estimation. In the communication between the network equipment and the terminal, the terminal can pre-distort the signal according to the nonlinear characteristic parameters of the power amplifier, so that the demodulation signal on the network side is more accurate, the demodulation performance on the network side is improved, and the peak value of the communication system is further improved. rate.

As shown in FIG. 9 , the method for determining nonlinear characteristic parameters of a power amplifier may include the following steps. Wherein, step S902 and step S907 are optional.

Step S901: the terminal sends the first frequency band set to the network device.

It should be understood that step S901 corresponds to step S801, and the relevant description in step S901 may refer to the description of step S801 above, and details are not repeated here to avoid repetition.

Step S902: the terminal sends third indication information for instructing the terminal to determine the nonlinear characteristic parameter of the power amplifier on at least one first frequency band to the network device.

It should be understood that step S902 corresponds to step S802, and for related descriptions in step S902, refer to the description of step S802 above, and details are not repeated here to avoid repetition.

Step S903: the network device sends to the terminal fourth indication information for indicating the transmission power difference between the first reference signal and the second reference signal.

It should be understood that step S903 corresponds to step S803, and related descriptions in step S903 may refer to the description of step S803 above, and details are not repeated here to avoid repetition.

Step S904: the terminal sends the first reference signal and the second reference signal on at least one first frequency band according to the fourth indication information.

It should be understood that step S904 corresponds to step S701, and the relevant description in step S904 may refer to the description of step S701 above, and details are not repeated here to avoid repetition.

Step S905: The network device determines at least one nonlinear characteristic parameter of the power amplifier on the first frequency band according to the first reference signal and the second reference signal.

It should be understood that step S905 corresponds to step S702, and for related descriptions in step S905, refer to the description of step S702 above, and details are not repeated here to avoid repetition.

Step S906: the terminal sends a seventh signal to the network device, and correspondingly, the network device receives the seventh signal from the terminal.

Step S907: the terminal sends to the network device fifth instruction information for instructing the network device to perform post-distortion processing on the seventh signal, and correspondingly, the network device receives the instruction information from the terminal for instructing the network device to perform post-distortion processing on the seventh signal Fifth instruction information.

After the network device determines at least one nonlinear characteristic parameter of the power amplifier in the first frequency band, it may perform post-distortion processing on the signal sent by the terminal in the frequency band, that is, perform distortion compensation on the signal. It is also possible not to perform distortion compensation on the signal. In such a case, the terminal may send the second instruction information to the network device, instructing the network device to perform post-distortion processing on the received signal on at least one first frequency band, and the network device will not execute the receiving signal until the second instruction information is received. The signal is subjected to the operation of distortion compensation.

Optionally, the fifth indication information may be UCI. The network device determines whether to perform post-distortion processing according to the frequency band scheduled by the UCI and the modulation order (modulation order) corresponding to the modulation coding scheme (MCS) indicated in the UCI. For example, when the frequency band belongs to FR1, if the modulation order is 6 (64QAM) or higher, post-distortion processing is performed, otherwise no processing is performed; when the frequency band belongs to FR2, if the modulation order is 4 (16QAM) or higher, Then carry out post-distortion processing, otherwise do not process.

Step S908: The network device performs post-distortion processing on the seventh signal according to the nonlinear characteristic parameters of the power amplifier to obtain the eighth signal.

In a possible implementation manner, when the network device receives the fifth indication information, it may perform post-distortion processing on the seventh signal according to the nonlinear characteristic parameter of the power amplifier to obtain the eighth signal, and demodulate the eighth signal. The network device performs post-distortion processing on the signal according to the fifth instruction information of the terminal, instead of performing post-distortion processing on the signal all the time, enabling the network device to perform post-distortion processing according to actual transmission requirements, and reducing the overhead of the network device.

In another possible implementation manner, when the network device does not receive the fifth indication information, it may also determine whether to process the seventh signal according to the post-distortion processing capability of the frequency bands of the first reference signal and the second reference signal. post-distortion processing. Specifically, when the modulation order of the transmission signal on the frequency band is greater than or equal to the second threshold, it is determined that the frequency band supports post-distortion processing, for example, the second threshold is 4 or 6, or other values, then the post-distortion processing is performed on the seventh signal The eighth signal is obtained through the distortion processing, and the eighth signal is demodulated. Wherein, the transmission signal may be a reference signal or a data signal.

In the foregoing embodiments, the estimation of the nonlinear characteristics of the power amplifier at the terminal side by the network side can be realized. By decoupling channel estimation and nonlinear feature estimation, the accuracy of nonlinear feature estimation can be improved while ensuring the accuracy of channel estimation. In the communication between network devices and terminals, the network side can perform post-distortion processing on the signal according to the nonlinear characteristic parameters of the power amplifier, so that the demodulation signal on the network side is more accurate, the demodulation performance on the network side is improved, and the communication system is improved. peak rate.

The method embodiments provided by the embodiments of the present application are described above, and the virtual device embodiments involved in the embodiments of the present application are described below.

Please refer to FIG. 10 . FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application. The device may be a terminal or a module (for example, a chip) in the terminal. As shown in Figure 10, the apparatus 1000 at least includes: a receiving unit 1001, a determining unit 1002, a sending unit 1003, and a processing unit 1004; wherein:

The receiving unit 1001 is configured to receive a first reference signal and a second reference signal from a network device on at least one first frequency band, the first reference signal corresponds to the first transmission power, and the second reference signal corresponds to the second transmission power power, the first transmit power is less than the first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a terminal Frequency bands that support post-distortion processing;

The determining unit 1002 is configured to determine the nonlinear characteristic parameter of the power amplifier in the at least one first frequency band according to the first reference signal and the second reference signal.

In one embodiment, the first threshold is a power threshold value of the input signal that causes the output signal of the power amplifier to be distorted.

In an embodiment, the determining unit 1002 determines the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal, specifically for:

determining channel state information according to the first reference signal;

In an embodiment, the second reference signal is different from the modulation mode of the first reference signal.

In an embodiment, the time domain resources occupied by the second reference signal and the first reference signal are different.

In one embodiment, the receiving unit 1001 is also used for:

In one embodiment, the device 1000 also includes:

The sending unit 1003 is configured to report the nonlinear characteristic parameter of the power amplifier to the network device.

In one embodiment, the receiving unit 1001 is also used for:

receiving a third signal from the network device;

The device 1000 also includes:

The processing unit 1004 is configured to perform post-distortion processing on the third signal according to the nonlinear characteristic parameters of the power amplifier to obtain a fourth signal.

In one embodiment, the receiving unit 1001 is also used for:

In one embodiment, the sending unit 1003 is further configured to:

For a more detailed description of the above-mentioned receiving unit 1001, determining unit 1002, sending unit 1003, and processing unit 1004, please refer directly to the relevant description of the terminal in the method embodiments shown in FIG. 3, FIG. 5, and FIG.

Please refer to FIG. 11 . FIG. 11 is a schematic structural diagram of another communication device provided by an embodiment of the present application. The apparatus may be a network device, or a module (for example, a chip) in the network device. As shown in Figure 11, the device 1100 at least includes: a sending unit 1101, a receiving unit 1102, and a processing unit 1103; wherein:

A sending unit 1101, configured to send a first reference signal and a second reference signal to a terminal on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power, The first transmit power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a terminal supported Frequency band for distortion processing.

In one embodiment, the sending unit 1101 is also used to:

In one embodiment, the device 1100 also includes:

The receiving unit 1102 is configured to receive the nonlinear characteristic parameter of the power amplifier from the terminal.

In one embodiment, the device 1100 also includes:

A processing unit 1103, configured to perform pre-distortion processing on the first signal according to the nonlinear characteristic parameters of the power amplifier to obtain a second signal;

The sending unit 1101 is further configured to send the second signal to the terminal.

In one embodiment, the sending unit 1101 is also used to:

Send a third signal to the terminal.

In one embodiment, the sending unit 1101 is also used to:

In one embodiment, the receiving unit 1102 is also used to:

For a more detailed description of the above-mentioned sending unit 1101, receiving unit 1102, and processing unit 1103, reference may be made directly to relevant descriptions of network devices in the method embodiments shown in FIG. 3, FIG. 5, and FIG. 6, and details are not repeated here.

Please refer to FIG. 12 . FIG. 12 is a schematic structural diagram of another communication device provided by an embodiment of the present application. The device may be a terminal or a module (for example, a chip) in the terminal. As shown in Figure 12, the device 1200 at least includes: a sending unit 1201, a receiving unit 1202, and a processing unit 1203; wherein:

A sending unit 1201, configured to send a first reference signal and a second reference signal to a network device on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power , the first transmit power is less than the first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to the first frequency band set, and the at least one first frequency band is supported by the terminal Frequency band for post-distortion processing.

In one embodiment, the sending unit 1201 is also configured to:

In one embodiment, the device 1200 also includes:

The receiving unit 1202 is configured to receive fourth indication information from the network device, where the fourth indication information is used to indicate the transmission power difference between the first reference signal and the second reference signal.

In one embodiment, the receiving unit 1202 is also used to:

In one embodiment, the device 1200 also includes:

A processing unit 1203, configured to perform pre-distortion processing on the fifth signal according to the nonlinear characteristic parameters of the power amplifier to obtain a sixth signal;

The sending unit 1201 is further configured to send the sixth signal to the network device.

In one embodiment, the sending unit 1201 is also configured to:

sending a seventh signal to the network device.

In one embodiment, the sending unit 1201 is also configured to:

Report the first frequency band set to the network device.

For a more detailed description of the above-mentioned sending unit 1201, receiving unit 1202, and processing unit 1203, reference may be made directly to relevant descriptions of terminals in the method embodiments shown in FIG. 7, FIG. 8, and FIG.

Please refer to FIG. 13 . FIG. 13 is a schematic structural diagram of another communication device provided by an embodiment of the present application. The apparatus may be a network device, or a module (for example, a chip) in the network device. As shown in Figure 13, the apparatus 1300 at least includes: a receiving unit 1301, a determining unit 1302, a sending unit 1303, and a processing unit 1304; wherein:

The receiving unit 1301 is configured to receive a first reference signal and a second reference signal from a terminal on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power , the first transmit power is less than the first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to the first frequency band set, and the at least one first frequency band is supported by the terminal Frequency bands for post-distortion processing;

A determining unit 1302, configured to determine the nonlinear characteristic parameter of the power amplifier in the at least one first frequency band according to the first reference signal and the second reference signal.

In an embodiment, the determining unit 1302 determines the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal, specifically for:

determining channel state information according to the first reference signal;

In one embodiment, the receiving unit 1301 is also used to:

In one embodiment, the device 1300 also includes:

The sending unit 1303 is configured to send fourth indication information to the terminal, where the fourth indication information is used to indicate the transmission power difference between the first reference signal and the second reference signal.

In one embodiment, the sending unit 1303 is also used to:

In one embodiment, the receiving unit 1301 is also used to:

receiving a seventh signal from the terminal;

The device 1300 also includes:

The processing unit 1304 is configured to perform post-distortion processing on the seventh signal according to the nonlinear characteristic parameters of the power amplifier to obtain an eighth signal.

In one embodiment, the receiving unit 1301 is also used to:

A first set of frequency bands is received from the terminal.

For a more detailed description of the above-mentioned receiving unit 1301, determining unit 1302, sending unit 1303, and processing unit 1304, you can directly refer to the relevant descriptions of the network devices in the method embodiments shown in FIG. 7, FIG. 8, and FIG. .

Based on the foregoing network architecture, please refer to FIG. 14 , which is a schematic structural diagram of another communication device provided by an embodiment of the present application. As shown in FIG. 14 , the apparatus 1400 may include one or more processors 1401, and the processors 1401 may also be referred to as processing units, and may implement certain control functions. The processor 1401 may be a general-purpose processor or a special-purpose processor. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, DU or CU, etc.), execute software programs, and process Data for Software Programs.

In an optional design, the processor 1401 may also store instructions and/or data 1403, and the instructions and/or data 1403 may be executed by the processor, so that the device 1400 executes the method described in the above-mentioned embodiment. described method.

In another optional design, the processor 1401 may include a transceiver unit configured to implement receiving and sending functions. For example, the transceiver unit may be a transceiver circuit, or an interface, or an interface circuit, or a communication interface. The transceiver circuits, interfaces or interface circuits for realizing the functions of receiving and sending can be separated or integrated together. The above-mentioned transceiver circuit, interface or interface circuit may be used for reading and writing code/data, or the above-mentioned transceiver circuit, interface or interface circuit may be used for signal transmission or transfer.

In yet another possible design, the apparatus 1400 may include a circuit, and the circuit may implement the function of sending or receiving or communicating in the foregoing method embodiments.

Optionally, the device 1400 may include one or more memories 1402, on which instructions 1404 may be stored, and the instructions may be executed on the processor, so that the device 1400 executes the method described in the above embodiment. described method. Optionally, data may also be stored in the memory. Optionally, instructions and/or data may also be stored in the processor. The processor and memory can be set separately or integrated together. For example, the corresponding relationships described in the foregoing method embodiments may be stored in a memory, or stored in a processor.

Optionally, the apparatus 1400 may further include a transceiver 1405 and/or an antenna 1406 . The processor 1401 may be called a processing unit, and controls the apparatus 1400 . The transceiver 1405 may be called a transceiver unit, a transceiver, a transceiver circuit, a transceiver device, or a transceiver module, etc., and is used to implement a transceiver function.

Optionally, the apparatus 1400 in the embodiment of the present application may be used to execute the methods described in FIG. 4 and FIG. 6 in the embodiment of the present application.

In one embodiment, the communication device 1400 may be a terminal, or a module (for example, a chip) in the terminal. When the computer program instructions stored in the memory 1402 are executed, the processor 1401 is used to control the determination unit 1002 and The processing unit 1004 performs the operations performed in the above-mentioned embodiments, the transceiver 1405 is used to perform the operations performed by the receiving unit 1001 and the sending unit 1003 in the above-mentioned embodiments, and the transceiver 1405 is also used to send to other communication devices other than the communication device information. The above-mentioned terminal or modules in the terminal may also be used to execute various methods performed by the terminal in the above-mentioned method embodiments in FIG. 3 and FIG. 5 , which will not be repeated here.

In one embodiment, the communication device 1400 may be a network device, or a module (for example, a chip) in the network device. When the computer program instructions stored in the memory 1402 are executed, the processor 1401 is used to control the processing unit 1103 executes the operations performed in the above embodiments, the transceiver 1405 is used to receive information from other communication devices other than this communication device, and the transceiver 1405 is also used to perform the operations performed by the sending unit 1101 and the receiving unit 1102 in the above embodiments . The foregoing network device or a module within the network device may also be used to execute various methods performed by the network device in the method embodiment in FIG. 6 above, which will not be repeated here.

In one embodiment, the communication device 1400 may be a terminal, or a module (for example, a chip) in the terminal. When the computer program instructions stored in the memory 1402 are executed, the processor 1401 is used to control the processing unit 1203 to execute For the operations performed in the above embodiments, the transceiver 1405 is used to perform the operations performed by the sending unit 1201 and the receiving unit 1202 in the above embodiments, and the transceiver 1405 is also used to send information to other communication devices other than the communication device. The above-mentioned terminal or modules in the terminal may also be used to execute various methods performed by the terminal in the above-mentioned method embodiments in FIG. 7 and FIG. 8 , which will not be repeated here.

In one embodiment, the communication device 1400 may be a network device, or a module (for example, a chip) in the network device. When the computer program instructions stored in the memory 1402 are executed, the processor 1401 is used to control the determination unit 1302 and the processing unit 1304 execute the operations performed in the above-mentioned embodiments, the transceiver 1405 is used to receive information from other communication devices other than the communication device, and the transceiver 1405 is also used to execute the receiving unit 1301 and the sending unit in the above-mentioned embodiments Step 1303 is to execute the operation. The foregoing network device or a module within the network device may also be used to execute various methods performed by the network device in the method embodiment in FIG. 9 above, which will not be repeated here.

The processors and transceivers described in this application can be implemented in integrated circuits (integrated circuits, ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application specific integrated circuits (ASICs), printed circuit boards ( printed circuit board, PCB), electronic equipment, etc. The processor and transceiver can also be fabricated using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-oxide-semiconductor (NMOS), P-type Metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (Bipolar Junction Transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The devices described in the above embodiments may be network devices or terminals, but the scope of the devices described in this application is not limited thereto, and the structure of the devices may not be limited by FIG. 14 . A device may be a stand-alone device or may be part of a larger device. For example the device may be:

(1) Stand-alone integrated circuits ICs, or chips, or chip systems or subsystems;

(2) A set of one or more ICs, optionally, the set of ICs may also include a storage unit for storing data and/or instructions;

(3) ASIC, such as modem (MSM);

(4) Modules that can be embedded in other devices;

(5) Receivers, terminals, smart terminals, cellular phones, wireless devices, handsets, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, machine devices, household devices, medical devices, industrial devices, etc.;

(6) Others and so on.

Please refer to FIG. 15 . FIG. 15 is a schematic structural diagram of a terminal provided by an embodiment of the present application. For ease of description, FIG. 15 only shows main components of the terminal. As shown in FIG. 15 , a terminal 1500 includes a processor, a memory, a control circuit, an antenna, and an input and output device. The processor is mainly used to process communication protocols and communication data, control the entire terminal, execute software programs, and process data of the software programs. Memory is primarily used to store software programs and data. The radio frequency circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal. Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.

When the terminal is turned on, the processor can read the software program in the storage unit, analyze and execute the instructions of the software program, and process the data of the software program. When it is necessary to send data wirelessly, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit processes the baseband signal to obtain a radio frequency signal and sends the radio frequency signal through the antenna in the form of electromagnetic waves. . When data is sent to the terminal, the radio frequency circuit receives the radio frequency signal through the antenna, the radio frequency signal is further converted into a baseband signal, and the baseband signal is output to the processor, and the processor converts the baseband signal into data and processes the data .

For ease of illustration, only one memory and processor are shown in FIG. 15 . In an actual terminal, there may be multiple processors and memories. A storage may also be called a storage medium or a storage device, which is not limited in this embodiment of the present invention.

As an optional implementation, the processor may include a baseband processor and a central processing unit. The baseband processor is mainly used to process communication protocols and communication data. The central processor is mainly used to control the entire terminal and execute software. Programs, which process data for software programs. The processor in FIG. 15 integrates the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit can also be independent processors, interconnected through technologies such as a bus. Those skilled in the art can understand that the terminal may include multiple baseband processors to adapt to different network standards, the terminal may include multiple central processors to enhance its processing capability, and various components of the terminal may be connected through various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and communication data can be built in the processor, or can be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

In one example, the antenna and the control circuit with the transceiver function may be regarded as the transceiver unit 1501 of the terminal 1500 , and the processor with the processing function may be regarded as the processing unit 1502 of the terminal 1500 . As shown in FIG. 15 , a terminal 1500 includes a transceiver unit 1501 and a processing unit 1502 . The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, and the like. Optionally, the device in the transceiver unit 1501 for realizing the receiving function can be regarded as a receiving unit, and the device in the transceiver unit 1501 for realizing the sending function can be regarded as a sending unit, that is, the transceiver unit 1501 includes a receiving unit and a sending unit. Exemplarily, the receiving unit may also be called a receiver, receiver, receiving circuit, etc., and the sending unit may be called a transmitter, transmitter, or transmitting circuit, etc. Optionally, the above-mentioned receiving unit and sending unit may be one integrated unit, or may be multiple independent units. The above-mentioned receiving unit and sending unit may be located in one geographic location, or may be dispersed in multiple geographic locations.

In one embodiment, the processing unit 1502 is configured to perform the operations performed by the determining unit 1002 and the processing unit 1004 in the above embodiments, and the transceiver unit 1501 is configured to perform the operations performed by the receiving unit 1001 and the sending unit 1003 in the above embodiments. The terminal 1500 may also be used to execute the various methods performed by the terminal in the above method embodiments in FIG. 3 , FIG. 5 and FIG. 6 , which will not be repeated here.

In one embodiment, the processing unit 1502 is configured to perform operations performed by the processing unit 1203 in the above embodiments, and the transceiver unit 1501 is configured to perform operations performed by the sending unit 1201 and the receiving unit 1202 in the above embodiments. The terminal 1500 may also be used to execute various methods performed by the terminal in the method embodiments in FIG. 7 , FIG. 8 , and FIG. 9 , which will not be repeated here.

The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the process related to the terminal in the method for determining the nonlinear characteristic parameters of the power amplifier provided in the above method embodiment can be implemented. .

The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it can realize the network device-related functions in the method for determining the nonlinear characteristic parameters of the power amplifier provided in the above method embodiment. process.

The embodiment of the present application also provides a computer program product, which, when running on a computer or a processor, enables the computer or processor to execute one or more steps in any one of the methods for determining nonlinear characteristic parameters of a power amplifier described above. If each component module of the above-mentioned device is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in the computer-readable storage medium.

The embodiment of the present application also provides a chip system, including at least one processor and a communication interface, the communication interface and the at least one processor are interconnected through lines, and the at least one processor is used to run computer programs or instructions to execute It includes some or all of the steps described in any one of the method embodiments corresponding to FIG. 3 and FIG. 5 to FIG. 9 above. The system-on-a-chip may consist of chips, or may include chips and other discrete devices.

The embodiment of the present application also discloses a system for determining nonlinear characteristic parameters of a power amplifier. The system includes a terminal and a network device. For a specific description, reference may be made to the method for determining nonlinear characteristic parameters of a power amplifier shown in FIG. 3 , and FIG. 5-9 .

It should be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile memory and nonvolatile memory. Wherein, the non-volatile memory can be a hard disk (hard disk drive, HDD), a solid-state drive (solid-state drive, SSD), a read-only memory (read-only memory, ROM), a programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, many forms of RAM are available such as static random access memory (static rAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous dRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM ) and direct memory bus random access memory (direct rambus RAM, DR RAM). A memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory in the embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, and is used for storing program instructions and/or data.

It should also be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, the memory (storage module) is integrated in the processor.

It should be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments provided herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: various media capable of storing program codes such as U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk.

The steps in the methods of the embodiments of the present application can be adjusted, combined and deleted according to actual needs.

The modules/units in the device of the embodiment of the present application can be combined, divided and deleted according to actual needs.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the various embodiments of the application.

Claims

A method for determining nonlinear characteristic parameters of a power amplifier, comprising:

Receive a first reference signal and a second reference signal from a network device on at least one first frequency band, the first reference signal corresponds to a first transmission power, the second reference signal corresponds to a second transmission power, and the first The transmit power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a frequency band that the terminal supports post-distortion processing ;

Determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal.
The method according to claim 1, wherein the first threshold is a power threshold value of an input signal that distorts the output signal of the power amplifier.
The method according to claim 1 or 2, wherein the determining the nonlinear characteristic parameters of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal comprises:

determining channel state information according to the first reference signal;

determining a nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the channel state information and the second reference signal.
The method according to any one of claims 1-3, wherein the second reference signal is different from the first reference signal in a modulation manner.
The method according to any one of claims 1-4, wherein the time domain resources occupied by the second reference signal and the first reference signal are different.
The method according to any one of claims 1-5, wherein the method further comprises:

Receive first indication information from the network device, where the first indication information is used to instruct the terminal to determine a nonlinear characteristic parameter of a power amplifier on the at least one first frequency band.
The method according to claim 6, further comprising:

Reporting the nonlinear characteristic parameter of the power amplifier to the network device.
The method according to claim 7, wherein the method further comprises:

receiving a second signal from the network device, where the second signal is a signal obtained by the network device performing pre-distortion processing on the first signal according to the nonlinear characteristic parameter of the power amplifier.
The method according to any one of claims 1-8, wherein the determining the nonlinear characteristic parameters of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal ,include:

Determine the power on the at least one first frequency band according to the first reference signal, the second reference signal, the maximum distortion order of the terminal and/or the maximum delay supported by the terminal, and the power amplifier model Amplifier nonlinear characteristic parameters.
The method according to any one of claims 1-9, wherein the method further comprises:

Reporting the first frequency band set, the maximum distortion order of the terminal and/or the maximum delay supported by the terminal to the network device.
A method for determining nonlinear characteristic parameters of a power amplifier, comprising:

Send a first reference signal and a second reference signal to the terminal on at least one first frequency band, the first reference signal corresponds to a first transmission power, the second reference signal corresponds to a second transmission power, and the first transmission power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is a frequency band that the terminal supports post-distortion processing.
The method according to claim 11, wherein the first threshold is a power threshold value of an input signal that distorts the output signal of the power amplifier.
The method according to claim 11 or 12, wherein the second reference signal is different from the first reference signal in a modulation manner.
The method according to any one of claims 11-13, wherein the time domain resources occupied by the second reference signal and the first reference signal are different.
The method according to any one of claims 11-14, wherein the method further comprises:

Sending first indication information to the terminal, where the first indication information is used to instruct the terminal to determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band.
The method according to claim 15, further comprising:

Receive the nonlinear characteristic parameter of the power amplifier from the terminal.
The method according to claim 16, further comprising:

performing predistortion processing on the first signal according to the nonlinear characteristic parameters of the power amplifier to obtain a second signal;

sending the second signal to the terminal.
The method according to any one of claims 11-17, wherein the method further comprises:

The first set of frequency bands, the maximum distortion order of the terminal, and/or the maximum delay supported by the terminal are received from the terminal.
A communication device, characterized by comprising:

A receiving unit, configured to receive a first reference signal and a second reference signal from a network device on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power , the first transmit power is less than the first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to the first frequency band set, and the at least one first frequency band is supported by the terminal Frequency bands for post-distortion processing;

A determining unit, configured to determine the nonlinear characteristic parameter of the power amplifier on the at least one first frequency band according to the first reference signal and the second reference signal.
A communication device, characterized by comprising:

A sending unit, configured to send a first reference signal and a second reference signal to a terminal on at least one first frequency band, the first reference signal corresponds to a first transmission power, and the second reference signal corresponds to a second transmission power, so The first transmit power is less than a first threshold, the second transmit power is greater than or equal to the first threshold, the at least one first frequency band belongs to a first frequency band set, and the at least one first frequency band is post-distortion supported by the terminal The frequency band to be processed.
A communication device, characterized in that it includes a processor, a memory, an input interface and an output interface, the input interface is used to receive information from other communication devices other than the communication device, and the output interface is used to send information to the other communication means than said communication means to output information, when a stored computer program stored in said memory is invoked by said processor, such that

The method according to any one of claims 1-10 is implemented; or

The method according to any one of claims 11-18 is implemented.
A computer-readable storage medium, wherein a computer program or a computer instruction is stored in the computer-readable storage medium, and when the computer program or computer instruction is executed by a processor, the

The method according to any one of claims 1-10 is implemented; or

The method according to any one of claims 11-18 is implemented.
A chip system, characterized in that it includes at least one processor, a memory and an interface circuit, the memory, the interface circuit and the at least one processor are interconnected through lines, and instructions are stored in the at least one memory; said instructions, when executed by said processor, such that

The method according to any one of claims 1-10 is implemented; or

The method according to any one of claims 11-18 is implemented.
A communication system, characterized by comprising the device as claimed in claim 21.