WO2023092341A1 - Appareil de communication et procédé de traitement de signal - Google Patents

Appareil de communication et procédé de traitement de signal Download PDF

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Publication number
WO2023092341A1
WO2023092341A1 PCT/CN2021/132847 CN2021132847W WO2023092341A1 WO 2023092341 A1 WO2023092341 A1 WO 2023092341A1 CN 2021132847 W CN2021132847 W CN 2021132847W WO 2023092341 A1 WO2023092341 A1 WO 2023092341A1
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Prior art keywords
link
signal
radio frequency
parameter
transfer function
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PCT/CN2021/132847
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English (en)
Chinese (zh)
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郭衍
李伟男
李峰
吉尔伯特皮尔
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华为技术有限公司
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Priority to PCT/CN2021/132847 priority Critical patent/WO2023092341A1/fr
Priority to CN202180104364.2A priority patent/CN118302954A/zh
Publication of WO2023092341A1 publication Critical patent/WO2023092341A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers

Definitions

  • the present application relates to the field of communication technologies, and in particular to a communication device and a signal processing method.
  • the power amplifier (power amplifier, PA) is a key device in the radio frequency link of the communication equipment of the communication system.
  • the specified rated power gear is then input to the back-end devices (such as duplexers, antennas, etc.) for wireless transmission.
  • PA is a nonlinear device, and its nonlinear characteristics will cause PA amplification loss and reduce PA amplification efficiency, thus affecting the signal transmission quality and efficiency of the communication system.
  • digital pre-distortion (DPD) technology can be used to pre-distort the signal, and then the processed signal is input to the PA for amplification, so that the pre-distortion processing characteristics and the nonlinear characteristics of the PA cancel each other out. Thereby reducing the influence of the non-linear distortion characteristics of the PA.
  • the envelope tracking (envelope tracking, ET) technology can also be used to power the PA. By providing a relatively appropriate amount of power to reduce energy waste, the amplification loss of the PA can be reduced and the amplification efficiency of the PA can be improved.
  • ET technology for example, LTE systems usually process 10 Megahertz (MHz) or even lower bandwidth signal, ET technology is used. It is generally believed that the ET power module will not have nonlinear distortion problems, so it is only necessary to deal with the nonlinear distortion of the PA. For example, the above-mentioned DPD technology corrects the nonlinear distortion of the PA.
  • the bandwidth supported by the communication system has increased significantly.
  • the bandwidth of the signal that needs to be processed by the communication system or device using ET technology will increase significantly, resulting in non-linearity of the ET power module Distortion, memory effect and other problems, which will directly aggravate the nonlinear distortion problem when the signal passes through the PA, resulting in a decrease in the signal processing performance and efficiency of the PA.
  • the present application provides a communication device and a signal processing method for improving the linearity of a PA output signal.
  • the present application provides a communication device, which includes: an envelope tracking ET link, a feedback link, at least one radio frequency link for outputting a radio frequency signal, and a first device for receiving the output radio frequency signal Power amplifier PA; wherein, the input end of the first PA is connected to the output end of the at least one radio frequency link, the power supply end of the first PA is connected to the output end of the ET link, and the first PA The output end of the PA is connected to the input end of the feedback link through a coupler; the ET link is used to provide a power supply voltage for the first PA; the first PA is used to use the The power supply voltage provided by the ET link, and performing power amplification processing on the output radio frequency signal, and outputting the processed signal; wherein, the adjacent band leakage ratio of the output signal of the first PA is lower than that of the first PA The adjacent band leakage ratio of the input signal; the feedback link is used to obtain the output signal of the first PA.
  • the adjacent band leakage ratio is an important index to reflect the linearity.
  • the adjacent band leakage ratio of the output signal of the PA is lower than that of the input signal of the PA, so the nonlinear distortion generated when the signal passes through the PA is reduced, and the output of the PA can be guaranteed.
  • the signal has a high linearity, thereby improving the working performance and efficiency of the PA.
  • the ET link includes a power supply module; wherein, the output terminal of the power supply module is connected to the power supply terminal of the first PA; the power supply module is used to generate The power supply voltage provided by the PA; wherein, the adjacent-band nonlinear leakage of the output signal of the power module is lower than the adjacent-band nonlinear leakage of the input signal of the power module.
  • the adjacent-band nonlinear leakage of the output signal of the power module in the RF link is lower than the adjacent-band nonlinear leakage of the input signal of the power module, indicating that the actual output signal of the power module is closer to the ideal output signal, so
  • the output signal of the power module has high linearity, which can reduce the influence of the nonlinear characteristics of the radio frequency link, especially the power module, on the performance of the PA, thereby improving the linearity of the PA output signal, and further improving the working performance and performance of the PA. efficiency.
  • the target radio frequency link includes: a radio frequency processing module and a first digital predistortion module; wherein the target radio frequency link is one or more radio frequency links in the at least one radio frequency link ;
  • the input end of the first digital pre-distortion module is the input end of the target radio frequency link, the output end of the first digital pre-distortion module is connected to the input end of the radio frequency processing module, and the radio frequency processing module
  • the output terminal of the target radio frequency link is the output terminal of the target radio frequency link;
  • the first digital predistortion module is used to perform digital predistortion processing on the input signal of the target radio frequency link;
  • the radio frequency processing module is used to perform digital predistortion processing on the input signal of the target radio frequency link;
  • the signal output by the first digital pre-distortion module is subjected to radio frequency processing.
  • the digital pre-distortion module can perform pre-distortion processing on the signal input to the radio frequency link, thereby canceling the nonlinear distortion that occurs when the signal on the radio frequency link passes through the PA , and then improve the linearity of the output signal of the PA.
  • the ET link further includes: an envelope shaping module and a second digital predistortion module; wherein, the input end of the envelope shaping module is connected to the input end of the at least one radio frequency link connected, the output end of the envelope shaping module is connected to the first input end of the second digital pre-distortion module; the output end of the second digital pre-distortion module is connected to the input end of the power supply module; the An envelope shaping module, configured to perform envelope shaping processing on the input signal of the at least one radio frequency link to obtain a target envelope signal, and the amplitude of the target envelope signal is greater than or equal to the input signal of the at least one radio frequency link The maximum value in the amplitude of the signal; the second digital pre-distortion module is configured to perform digital pre-distortion processing on the target envelope signal.
  • the feedback link is further used to: determine the first parameter and the second parameter of the first PA according to the output signal of the first PA; wherein, the first parameter is used for Characterize the nonlinear distortion characteristic of the first PA; the second parameter is used to characterize the nonlinear distortion characteristic of the ET link for the first PA.
  • the input end of the PA in the communication device is connected to the radio frequency link, and the power supply end is connected to the output end of the ET link. Therefore, the output signal of the PA can reflect the nonlinear distortion of the ET link and the non-linear distortion of the PA at the same time.
  • the effect of linear distortion on a signal on an RF link can respectively determine parameters reflecting the nonlinear distortion characteristics of the ET link and the nonlinear distortion characteristics of the PA according to the output signal of the PA.
  • the communication device can perform predistortion processing on the signals on the radio frequency link and the ET link respectively before the signals are input into the PA according to the parameter, so as to reduce the nonlinear distortion of the final output signal of the PA.
  • the communication device can support the communication device to perform more accurate pre-distortion processing for the PA and the ET link respectively by determining the above parameters to reduce the nonlinear distortion The impact on the signal processing performance of the PA, and then improve the working performance and efficiency of the PA.
  • the output end of the feedback link includes a first output end, and the first output end is used to output the first parameter; the second input end of the first digital predistortion module Connected to the first output end of the feedback link; when the first digital pre-distortion module performs digital pre-distortion processing on the input signal of the target radio frequency link, it is specifically used to: receive the input signal of the feedback link The first parameter output by the first output terminal; according to the first parameter, digital predistortion processing is performed on the input signal of the target radio frequency link.
  • the feedback link can send the determined nonlinear distortion characteristic parameters of the PA to the digital predistortion module on the radio frequency link, and then the digital predistortion module on the radio frequency link can , to perform more accurate pre-distortion processing on the signal on the radio frequency link, so that the pre-distortion processing and the nonlinear distortion of the PA cancel each other, and realize the linear output of the PA.
  • the output end of the feedback link includes a second output end, and the second output end is used to output the second parameter;
  • the second input end of the second digital predistortion module Connected to the second output end of the feedback link;
  • the second digital pre-distortion module when performing digital pre-distortion processing on the target envelope signal, is specifically configured to: receive the second output of the feedback link The second parameter output from the output terminal; perform digital pre-distortion processing on the target envelope signal according to the second parameter.
  • the feedback link can send the determined nonlinear distortion characteristic parameters of the ET link to the digital pre-distortion module on the ET link, and then the digital pre-distortion module on the ET link can Linear distortion characteristic parameters, more accurate pre-distortion processing for signals on the ET link, so that the pre-distortion processing and the nonlinear distortion of the ET link cancel each other out, reducing the impact of the nonlinear distortion of the ET link on the PA , in order to achieve a linear output of the PA.
  • the feedback link includes a processing module; the processing module is configured to perform the following steps: determining an error between an output signal of the first PA and an input signal of the target radio frequency link signal; obtain a first transfer function and a second transfer function; wherein, the first transfer function is used to characterize the relationship between the input signal of the target radio frequency link and the output signal of the first PA, and the first The second transfer function is used to characterize the relationship between the input signal and the output signal of the ET link, the first parameter is an unknown parameter in the first transfer function, and the second parameter is the second transfer function An unknown parameter in the function; calculating the first parameter and the second parameter based on the error signal, the first transfer function and the second transfer function.
  • the influence of the nonlinearity of the PA on the output signal of the PA can be reflected in the first transfer function
  • the influence of the nonlinearity of the ET link on the output signal of the PA can be reflected in the second transfer function
  • the error signal The influence of the nonlinearity of the PA and the nonlinearity of the ET link on the output signal of the PA is integrated. Therefore, according to the relationship between the error signal and the first transfer function and the second transfer function, it can ensure that the nonlinear characteristics of the PA and the nonlinear characteristics of the ET link can be determined, and then the signal input to the PA and the ET link More accurate pre-distortion processing on the signal above.
  • the feedback link further includes: a feedback module and an analog-to-digital conversion module; wherein, the input end of the feedback module is connected to the output end of the first PA through the coupler, so The output end of the feedback module is connected to the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is connected to the input end of the processing module; the feedback module is used to obtain the first PA The output signal of the first PA is sent to the analog-to-digital conversion module; the analog-to-digital conversion module is used to perform analog-to-digital conversion processing on the output signal of the first PA, and the processed The output signal of the first PA is sent to the processing module.
  • the feedback link can couple and sample the output signal of the PA through the coupler. On the one hand, it will not affect the subsequent processing of the output signal of the PA. On the other hand, the PA and ET link can be determined according to the sampled signal. Non-linear distortion characteristics, and then facilitate digital pre-distortion processing on the signal input to the PA and the information on the ET link according to the determined non-linear distortion characteristics.
  • the processing module when determining the error signal between the output signal of the first PA and the input signal of the target radio frequency link, is specifically configured to:
  • the output signal of the first PA is divided by the gain coefficient of the first PA to obtain the normalized output signal of the first PA;
  • the input signal of the target radio frequency link is divided by the normalized output signal of the first PA subtracted to obtain the error signal.
  • the source of system distortion is the nonlinearity of the ET link and the nonlinearity of the PA
  • the final impact on the system linearity is reflected in the error between the output signal of the PA and the input signal of the RF link . Therefore, only based on the error signal between the output signal of the PA and the input signal of the radio frequency link, the nonlinear distortion characteristics of the ET link and the PA can also be determined, ensuring the accuracy of determining various factors that affect the linearity of the system.
  • the nonlinear distortion characteristic parameters of the two structures of the ET link and the PA can be obtained by sampling the signal of the output path of the PA, which avoids the adverse effects of increasing the number of devices and reducing the integration degree caused by the signal sampling of the ET link.
  • the processing module when calculating the first parameter and the second parameter according to the error signal, the first transfer function and the second transfer function, the processing module specifically uses In: determining a target transfer function according to the first transfer function and the second transfer function; wherein the target transfer function is used to characterize the data coupling between the first transfer function and the second transfer function Relationship, the unknown parameter in the target transfer function includes the first parameter and the second parameter; after using the error signal as the function value of the target transfer function, calculate the unknown parameter in the target function, The first parameter and the second parameter are obtained.
  • the expressions of the first transfer function and the second transfer function can be determined, thus the expression of the objective function for expressing the relationship between the first transfer function and the second transfer function can be determined.
  • the relationship between the first transfer function, the second transfer function and the error signal can be determined, so the relationship between the objective function and the error signal can be determined.
  • the unknowns in the objective function namely the first parameter and the second parameter, can be solved. Therefore, the method can accurately solve the first parameter and the second parameter of the PA through mathematical calculation.
  • the processing module when calculating the first parameter and the second parameter according to the error signal, the first transfer function and the second transfer function, the processing module specifically uses In: establishing a nonlinear model for representing the corresponding relationship between the error signal and the first transfer function and the second transfer function; calculating the norm of the error signal; converting the norm of the error signal The number is used as the objective function of the nonlinear model, and the unknown parameters in the first transfer function and the second transfer function are solved to obtain the first parameter and the second parameter.
  • the optimal solution of unknown parameters can be obtained by using the objective function to solve the parameters. Therefore, solving the first parameter and the second parameter by using the objective function can also obtain the first parameter and the second parameter that more accurately reflect the nonlinear characteristics of the PA and ET links. In addition, in the process of solving the first parameter and the second parameter, there is no need to obtain the specific expression of the above-mentioned objective function, and the first parameter and the second parameter can also be solved. In the case of a complex objective function, a certain calculation speed.
  • the apparatus further includes: a second PA configured to receive output radio frequency signals of one or more radio frequency links in the at least one radio frequency link; wherein, the The input end is connected to the output end of the one or more radio frequency links, the power supply end of the second PA is connected to the output end of the ET link, and the output end of the second PA is connected to the feedback link
  • the input terminal of is connected through a coupler; the ET link is also used to: provide a power supply voltage for the second PA; the second PA is used to use the power supply voltage provided by the ET link through the power supply terminal, and , performing power amplification processing on the output radio frequency signals of the one or more radio frequency links, and outputting the processed signal; wherein, the adjacent band leakage ratio of the output signal of the second PA is lower than that of the second PA The adjacent band leakage ratio of the input signal; the feedback link is also used to: obtain the output signal of the second PA.
  • the communication device can include multiple PAs and RF links connected to the PAs, the ET link in the communication device can supply power to multiple PAs, and the feedback link can also obtain the output signals of multiple PAs respectively . Therefore, the method is also applicable to the scenario of multiple radio frequency links and/or multiple PAs, and multiple PAs share the ET link and the feedback link, which can reduce the impact on the hardware distribution and integration of the communication device.
  • the communication device may perform nonlinear distortion on signals on the radio frequency link and the ET link for each PA, so as to improve the linearity of the output signal of each PA.
  • the present application provides a signal processing method, which is applied to a feedback link in a communication device, and the communication device further includes an ET link, at least one radio frequency link is used to output a radio frequency signal, and is used to receive The first PA that outputs radio frequency signals; wherein, the input end of the first PA is connected to the output end of the at least one radio frequency link, and the power supply end of the first PA is connected to the output end of the ET link connected, the output end of the first PA is connected to the input end of the feedback link through a coupler; the method includes: obtaining the output signal of the first PA; wherein, the output signal of the first PA The adjacent band leakage ratio is lower than the adjacent band leakage ratio of the input signal of the first PA; the first parameter and the second parameter of the first PA are determined according to the output signal of the first PA; wherein, the first The first parameter of the PA is used to characterize the nonlinear distortion characteristic of the first PA, and the second parameter of the first PA is used to characterize the nonlinear
  • the first parameter of the first PA is used to perform digital predistortion processing on the input signal of the target radio frequency link; wherein the target radio frequency link is the One or more radio frequency links; the second parameter of the first PA is used to perform digital predistortion processing on signals on the ET link.
  • determining the first parameter and the second parameter of the first PA according to the output signal of the first PA includes: determining the relationship between the output signal of the first PA and the target radio frequency link The error signal between the input signals of the input signal; obtain the first transfer function and the second transfer function; wherein, the first transfer function is used to characterize the difference between the input signal of the target radio frequency link and the output signal of the first PA The relationship between the second transfer function is used to characterize the relationship between the input signal and the output signal of the ET link, the first parameter is an unknown parameter in the first transfer function, and the second The parameters are unknown parameters in the second transfer function; the first parameter and the second parameter are calculated according to the error signal, the first transfer function and the second transfer function.
  • determining the error signal between the output signal of the first PA and the input signal of the target radio frequency link includes: combining the output signal of the first PA with the first PA The gain coefficient of the first PA is divided to obtain the normalized output signal of the first PA; the input signal of the target radio frequency link is subtracted from the normalized output signal of the first PA to obtain the error signal.
  • calculating the first parameter and the second parameter according to the error signal, the first transfer function and the second transfer function includes: according to the first transfer function and the second transfer function to determine a target transfer function; wherein the target transfer function is used to characterize the data coupling relationship between the first transfer function and the second transfer function, and the target transfer function in The unknown parameters include the first parameter and the second parameter; after the error signal is used as the function value of the target transfer function, the unknown parameters in the target function are calculated to obtain the first parameter and the second parameter.
  • calculating the first parameter and the second parameter according to the error signal, the first transfer function, and the second transfer function includes: establishing a A nonlinear model of the corresponding relationship between the signal and the first transfer function and the second transfer function; calculate the norm of the error signal; use the norm of the error signal as the target of the nonlinear model function, solving unknown parameters in the first transfer function and the second transfer function to obtain the first parameter and the second parameter.
  • an embodiment of the present application provides a device, the device includes a processor and a memory; the memory is used to store computer program instructions; the processor is used to execute the computer program instructions stored in the memory to implement the above-mentioned first The method described in the second aspect or any possible design of the second aspect.
  • the present application provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program runs on a computer, the computer executes the above-mentioned second aspect or the second Aspects of any possible design of the described method.
  • the present application provides a computer program product, the computer program product includes a computer program or an instruction, and when the computer program or instruction is run on a computer, the computer executes the above-mentioned second aspect or the second aspect Any possible design of the described method.
  • the present application provides a chip, where the chip includes the communication device described in the first aspect or any possible design of the first aspect.
  • the present application provides an electronic device, the electronic device includes the communication device described in the above first aspect or any possible design of the first aspect, or, the electronic device includes the communication device described in the sixth aspect above chip.
  • Fig. 1 is a schematic diagram of a digital predistortion processing system
  • FIG. 2 is a schematic diagram of the architecture of an ET system
  • FIG. 3a is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • FIG. 3b is a schematic structural diagram of another communication system provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a communication device provided in an embodiment of the present application.
  • FIG. 5a is a schematic diagram of a comparison of input and output signals of a power module provided by an embodiment of the present application.
  • FIG. 5b is a schematic diagram of a comparison of input and output signals of a PA provided in an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a communication device with a single radio frequency link provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another communication device with a single radio frequency link provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a communication device with multiple radio frequency links provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram of another multi-radio link communication device provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a signal processing method provided by an embodiment of the present application.
  • DPD digital Pre-distortion
  • the DPD module that performs digital pre-distortion processing when performing digital pre-distortion processing for the nonlinear distortion characteristics of the PA, can fit the nonlinear distortion characteristics of the PA through a nonlinear behavior model , obtain the inverse function of the nonlinear distortion characteristic of the PA and realize it in the digital baseband/IF through digital circuits.
  • the input signal will pass through the DPD module and the PA two nonlinear modules with opposite characteristics, so that the nonlinear distortion characteristics of each other cancel each other out, so as to achieve the final linear transmission characteristics, that is, the PA can linearly amplify the input signal to obtain the output signal. Effect.
  • Adjacent channel leakage ratio Adjacent channel leakage ratio, ACLR: also known as adjacent non-linear leakage ratio or adjacent channel leakage ratio or adjacent channel leakage ratio, usually defined as the power leakage in the adjacent channel and the power of the main channel
  • ACLR Adjacent channel leakage ratio
  • adjacent non-linear leakage ratio or adjacent channel leakage ratio or adjacent channel leakage ratio usually defined as the power leakage in the adjacent channel and the power of the main channel
  • the ratio can be used to measure the influence characteristics of radio frequency devices on channels other than the main operating frequency, so the adjacent band leakage ratio is a common indicator to measure the linearity of the system.
  • Adjacent-band leakage is the amount of power that the main power leaks to adjacent frequency channels. The smaller the adjacent band leakage, the smaller the main power leakage, the higher the system linearity, and the better the performance of the communication system; the larger the adjacent band leakage, the greater the main power leakage, the lower the system linearity, and the better the performance of the communication system. The worse the performance.
  • At least one in the embodiments of the present application refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the contextual objects are an “or” relationship.
  • At least one (item) of the following” or similar expressions refer to any combination of these items, including any combination of single item(s) or plural item(s).
  • At least one item (unit) of a, b or c can represent: a, b, c, a and b, a and c, b and c, or a, b and c, wherein a, b, c Can be single or multiple.
  • the PA In order to obtain the optimal amplification efficiency of the PA, it is usually necessary to make the PA work in a large signal range. However, due to some non-ideal characteristics of the structure of the PA itself, the PA usually exhibits very strong nonlinear characteristics when working in the large signal range. This nonlinear characteristic will deteriorate the signal transmission quality of the communication system and affect the adjacent frequency band system.
  • DPD technology and ET technology can be applied to the communication system to which the PA belongs, and the signal distortion caused by the nonlinear characteristics of the PA can be reduced by corresponding processing, and the power consumption of the PA can be reduced.
  • the principle of DPD technology is to fit the nonlinear distortion characteristics of the PA through the nonlinear behavior model of the DPD module, obtain the inverse function of the nonlinear distortion characteristics of the PA, and then determine the appropriate pre-distortion parameters according to the inverse function, and Before the signal is input to the PA, pre-distortion processing is performed on the signal according to the determined pre-distortion parameter. In this way, the signal passes through the DPD module and the PA two nonlinear modules with opposite characteristics in sequence, so that the nonlinear distortion characteristics between the DPD module and the PA cancel each other out, so that the final linear output can be realized.
  • the principle of ET technology is to modulate the power supply port or bias port of the PA according to the amplitude of the PA input signal to achieve the effect of reducing the amplification loss of the PA, thereby improving the working energy conversion efficiency of the PA.
  • the PA can be powered by the ET power module, and the voltage provided by the ET power module to the PA varies with the envelope of the signal. That is, when the signal envelope is large, a higher supply voltage is provided, and when the signal envelope is small, a lower supply voltage is provided. Therefore, the power consumption of the RF PA architecture based on ET technology can be greatly reduced in theory, thereby significantly improving the energy conversion efficiency of the RF front-end.
  • FIG. 2 is a schematic structural diagram of an ET system.
  • an ET link is connected between the input end of the radio frequency link and the drain port of the PA connected to the radio frequency link.
  • the road includes an envelope shaping module, a look-up table (look-up-table, LUT) module and an envelope-tracking modulation (envelope-tracking modulator, ETM) power supply (supply) connected in sequence.
  • ETM envelope-tracking modulator
  • the ET link determines the baseband envelope signal of the input RF link through the envelope shaping module, and then performs equal-gain nonlinear LUT processing on the baseband envelope signal through the LUT module, and finally provides the corresponding power supply through the ETM and feeds it into the drain of the PA Pole port, so as to realize the power supply to PA.
  • the radio frequency link can use DPD technology to pre-distort the signal before the signal is input to the PA, so that the nonlinear distortion of the signal when passing through the radio frequency link and the PA cancels each other, thereby achieving the linear output effect of the PA.
  • the signal bandwidth processed by the ET system will increase significantly (for example, in the future 5G communication scenarios, support for signal bandwidths above 200 MHz will be considered).
  • ETM in broadband communication scenarios will inevitably introduce problems such as very bad nonlinear distortion characteristics and memory effects, which will directly affect the linearity of PA output signals, resulting in PA
  • the decrease in signal processing performance and efficiency will also affect the overall linearity and signal processing performance of the ET system. Therefore, in the broadband communication scenario, in addition to the influence of the nonlinear distortion characteristics of the PA, the ET system must also consider the influence of the nonlinear distortion characteristics of the ETM itself on the PA and the signal processing process. In other words, the design of the ET system must be adapted to broadband communication scenarios.
  • the embodiment of the present application provides a communication device and a signal processing method, which are used to determine the nonlinear distortion characteristics of different structures that affect the linearity of the PA output signal, so as to perform corresponding correction processing according to the nonlinear distortion characteristics of different structures , and then improve the linearity of the PA output signal, and improve the performance and efficiency of the PA.
  • the solutions provided by the embodiments of the present application are more adaptable to communication scenarios with high system integration and compact system hardware layout.
  • the technical solutions of the embodiments of the present application may be applied to various wireless communication systems or communication nodes in the wireless communication systems.
  • the wireless communication system may be, for example, an LTE system, 3G, 4G, 5G communication system or New Radio (New Radio, NR), a next-generation communication system (such as a 6G system), etc., which are not specifically limited here.
  • the communication node may be, for example, a core network (core network, CN) device, a radio access network (radio access network, RAN) device (such as a base station), user equipment, etc., which is not specifically limited here.
  • devices can be divided into devices that provide wireless network services and devices that use wireless network services.
  • Devices that provide wireless network services refer to devices that form a wireless communication network, which can be referred to as network equipment or network elements for short.
  • Network equipment usually belongs to operators or infrastructure providers and is operated or maintained by these vendors.
  • Network equipment can be further divided into RAN equipment and CN equipment.
  • Typical RAN equipment includes a base station (base station, BS).
  • the base station may also be called a wireless access point (access point, AP), or a transmission reception point (transmission reception point, TRP).
  • the base station may be a general node B (generation Node B, gNB) in a 5G new radio (new radio, NR) system, or an evolved node B (evolutional Node B, eNB) in a 4G long term evolution (long term evolution, LTE) system.
  • the base station can be divided into a macro base station or a micro base station.
  • Micro base stations are also sometimes referred to as small base stations or small cells.
  • a device using a wireless network service may be referred to as a user device or a terminal (terminal) for short.
  • the terminal can establish a connection with the network equipment, and provide users with specific wireless communication services based on the services of the network equipment.
  • user equipment user equipment
  • subscriber unit subscriber unit
  • SU subscriber unit
  • the terminal compared with the base station usually placed in a fixed location, the terminal often moves with the user, and is sometimes called a mobile station (mobile station, MS).
  • some network devices such as a relay node (relay node, RN) or a wireless router, etc., can sometimes be considered as terminals because they have a UE identity or belong to a user.
  • the terminal can be a mobile phone (mobile phone), a tablet computer (tablet computer), a laptop computer (laptop computer), a wearable device (such as a smart watch, a smart bracelet, a smart helmet, smart glasses), and other Devices with wireless access capabilities, such as smart cars, various Internet of things (IOT) devices, including various smart home devices (such as smart meters and smart home appliances) and smart city devices (such as security or monitoring equipment, Intelligent road traffic facilities), etc.
  • IOT Internet of things
  • smart home devices such as smart meters and smart home appliances
  • smart city devices such as security or monitoring equipment, Intelligent road traffic facilities
  • Fig. 3a is a schematic structural diagram of a communication system provided by an embodiment of the present application, and the communication system may be a terminal or a base station in the embodiment of the present application.
  • the communication system may include multiple components, such as: application subsystem, memory (memory), mass storage (massive storage), baseband subsystem, radio frequency integrated circuit (radio frequency integrated circuit, RFIC) , RF front end (radio frequency front end, RFFE) device, and antenna (antenna, ANT). These components can be coupled by various interconnecting buses or other electrical connections.
  • ANT_1 represents the first antenna
  • ANT_N represents the Nth antenna
  • N is a positive integer greater than 1.
  • Tx represents the sending path
  • Rx represents the receiving path
  • different numbers represent different paths.
  • Each path can represent a signal processing channel.
  • FBRx represents a feedback receiving path
  • PRx represents a main receiving path
  • DRx represents a diversity receiving path.
  • HB means high frequency
  • LB means low frequency, both refer to the relative high and low frequencies.
  • BB means baseband.
  • the application subsystem can be used as the main control system or main computing system of the communication system to run the main operating system and application programs, manage the software and hardware resources of the entire communication system, and provide users with user interface.
  • the application subsystem may also include driver software related to other subsystems (eg, baseband subsystem).
  • An application subsystem may include one or more processors. Multiple processors may be multiple processors of the same type, or may include a combination of multiple types of processors.
  • the processor may be a general-purpose processor or a processor designed for a specific field.
  • the processor may be a central processing unit (center processing unit, CPU), a digital signal processor (digital signal processor, DSP), or a microcontroller (micro control unit, MCU).
  • the processor can also be a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processing, ISP), an audio signal processor (audio signal processor, ASP), and an artificial intelligence (artificial intelligence, AI) Apply a specially designed AI processor.
  • AI processors include but are not limited to neural network processing unit (NPU), tensor processing unit (TPU) and processors called AI engines.
  • radio frequency integrated circuits including RFIC 1, and one or more optional RFIC 2 and radio frequency front-end devices can together form a radio frequency subsystem.
  • the RF subsystem can also be divided into RF receive path (RF receive path) and RF transmit path (RF transmit path).
  • the radio frequency transmitting channel also called radio frequency transmitting link
  • the radio frequency receiving channel also called radio frequency receiving link
  • process the radio frequency signal such as amplified, filtered and down-converted
  • the radio frequency transmission channel can receive the baseband signal from the baseband subsystem, process the baseband signal (such as up-converting, amplifying and filtering) to obtain a radio frequency signal, and finally radiate the radio frequency signal into space through the antenna.
  • Radio frequency integrated circuits may be referred to as radio frequency processing chips or radio frequency chips.
  • the radio frequency subsystem may include an antenna switch, an antenna tuner, a low noise amplifier (low noise amplifier, LNA), a power amplifier (power amplifier, PA), a mixer (mixer), a local oscillator (local oscillator, LO ), filters and other electronic devices, these electronic devices can be integrated into one or more chips as required.
  • Radio frequency integrated circuits may be referred to as radio frequency processing chips or radio frequency chips.
  • the RF front-end device can also be a stand-alone chip. RF chips are sometimes called receivers, transmitters or transceivers. With the evolution of technology, the antenna can sometimes be considered as a part of the radio frequency subsystem and can be integrated into the chip of the radio frequency subsystem.
  • radio frequency subsystem can also use different devices or different integration methods based on power consumption and performance requirements. For example, if some devices belonging to the radio frequency front end are integrated into the radio frequency chip, even the antenna and the radio frequency front end devices are integrated into the radio frequency chip, the radio frequency chip may also be called a radio frequency antenna module or an antenna module.
  • the radio frequency signal is usually an analog signal
  • the signal processed by the baseband subsystem is mainly a digital signal
  • an analog-to-digital conversion device is also required in the communication system.
  • the analog-to-digital conversion device may be set in the baseband subsystem, or may be set in the radio frequency subsystem.
  • Analog to digital conversion devices include an analog to digital converter (analog to digital converter, ADC) that converts an analog signal into a digital signal, and a digital to analog converter (digital to analog converter, DAC) that converts a digital signal to an analog signal.
  • the baseband subsystem may also include one or more processors.
  • the baseband subsystem may also include one or more hardware accelerators (hardware accelerator, HAC).
  • Hardware accelerators can be used to specifically complete some sub-functions with high processing overhead, such as assembly and analysis of data packets, encryption and decryption of data packets, etc.
  • These sub-functions can also be implemented by using a general-purpose processor, but due to performance or cost considerations, it may be more appropriate to use a hardware accelerator.
  • the hardware accelerator is mainly realized by an application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • one or more relatively simple processors, such as MCUs may also be included in the hardware accelerator.
  • the baseband subsystem and the radio frequency subsystem together form a communication subsystem, which provides wireless communication functions for the communication system.
  • the baseband subsystem is responsible for managing the hardware and software resources of the communication subsystem, and can configure the working parameters of the radio frequency subsystem.
  • the processor of the baseband subsystem can run the subsystem operating system of the communication subsystem, which is usually an embedded operating system or a real time operating system (real time operating system).
  • the baseband subsystem can be integrated into one or more chips, which can be called baseband processing chips or baseband chips.
  • the baseband subsystem can be used as an independent chip, and the chip can be called a modem (modem) or a modem chip.
  • the baseband subsystem can be manufactured and sold in units of modem chips. Modem chips are sometimes called baseband processors or mobile processors.
  • the baseband subsystem can also be further integrated into a larger chip, and manufactured and sold in units of a larger chip. This larger chip can be called a system-on-a-chip, system-on-a-chip, or system-on-a-chip (SoC), or simply an SoC chip.
  • SoC system-on-a-chip
  • the software components of the baseband subsystem can be built into the hardware components of the chip before the chip leaves the factory, or can be imported into the hardware components of the chip from other non-volatile memories after the chip leaves the factory, or can be downloaded online through the network and update these software components.
  • the communication system also includes storage, such as the internal memory and mass storage in Fig. 3a.
  • the application subsystem and the baseband subsystem may also include one or more buffers respectively.
  • the memory can be divided into volatile memory (volatile memory) and non-volatile memory (non-volatile memory, NVM).
  • Volatile memory refers to memory in which data stored inside will be lost when the power supply is interrupted.
  • volatile memory is mainly random access memory (random access memory, RAM), including static random access memory (static RAM, SRAM) and dynamic random access memory (dynamic RAM, DRAM).
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • Non-volatile memory refers to memory in which the data stored inside will not be lost even if the power supply is interrupted.
  • Non-volatile memories include read only memory (ROM), optical discs, magnetic disks, and various memories based on flash memory technology.
  • volatile memory can be used for memory and cache
  • non-volatile memory such as flash memory, can be used for large-capacity storage.
  • Fig. 3b is a schematic structural diagram of another communication system provided by an embodiment of the present application.
  • Figure 3b shows some common devices used for RF signal processing in communication systems. It should be understood that although only one radio frequency receiving channel and one radio frequency transmitting channel are shown in FIG. 3b, the communication system in the embodiment of the present application is not limited thereto. launch channel.
  • each radio frequency transmission channel may include devices such as a DAC and a mixer, and before the output signal of each radio frequency transmission channel is transmitted through the antenna, power adjustment processing is performed on the output signal of the radio frequency signal transmission channel through the PA.
  • the radio frequency receiving channel may include devices such as mixers, filters, and ADCs, and the antenna received by the radio frequency receiving channel from the antenna may also be processed by devices such as a low noise amplifier (LNA).
  • LNA low noise amplifier
  • FIG. 3 b is only an example, and the embodiments of the present application do not enumerate the devices included in the radio frequency receiving channel and the radio frequency transmitting channel one by one.
  • the communication system may further include an ET link for supplying power to the PA.
  • ET link for supplying power to the PA.
  • FIG. 4 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • the communication device provided by the embodiment of the present application may include: at least one radio frequency link, at least one PA, an ET link, and a feedback link.
  • the at least one radio frequency link is used to output radio frequency signals
  • the number of the at least one radio frequency link is N
  • N is a positive integer.
  • each radio frequency link is used to receive an input signal, perform radio frequency processing on the input signal, and send the processed signal to a PA connected to the radio frequency link.
  • the signal received by the radio frequency link may be a baseband signal to be sent to other communication devices.
  • the at least one PA includes at least the first PA.
  • the input end of the first PA is connected to the output end of the at least one PA, and the first PA is used to receive a radio frequency signal output by the at least one PA.
  • the input end of the first PA is connected to the output end of one or more PAs in the at least one PA, and the first PA is used to receive the output end of the one or more PAs output RF signal.
  • the first PA may be the PA connected to radio frequency link 1 shown in FIG. 4 , and in this scenario, the input end of the first PA is only connected to the output end of one radio frequency link.
  • the input end of the first PA may also be connected to the output end of a radio frequency link other than the radio frequency link 1, for example, connected to the output end of the radio frequency link N.
  • the ET link is configured to provide a power supply voltage for the first PA.
  • the power supply end of the first PA is connected to the output end of the ET link, and the output end of the first PA is connected to the input end of the feedback link through a coupler.
  • the first PA is configured to use the power supply voltage provided by the ET link through the power supply terminal, and perform power amplification processing on the radio frequency signal from the radio frequency link connected to the first PA, and output the processed signal; wherein, in a steady state, the adjacent-band leakage ratio of the output signal of the first PA is lower than the adjacent-band leakage ratio of the input signal of the first PA.
  • the feedback link is used to obtain the output signal of the first PA.
  • the at least one PA further includes a second PA
  • the second PA is configured to receive output radio frequency signals of one or more radio frequency links in the at least one radio frequency link.
  • the input end of the second PA is connected to the output end of the one or more radio frequency links
  • the power supply end of the second PA is connected to the output end of the ET link
  • the The output end is connected to the input end of the feedback link through a coupler.
  • the ET link is also used to provide a power supply voltage for the second PA
  • the feedback link is also used to obtain an output signal of the second PA.
  • the second PA may be used to use the power supply voltage provided by the ET link through the power supply terminal, and perform power amplification processing on the output radio frequency signals of the one or more radio frequency links, and output the processed signal; Wherein, in a steady state, the adjacent-band leakage ratio of the output signal of the second PA is lower than the adjacent-band leakage ratio of the input signal of the second PA.
  • the second PA may be the PA connected to the radio frequency link N shown in FIG. 4 .
  • the connection mode and working mode of the second PA are similar to those of the first PA, and reference may be made to the introduction of the first PA, which will not be described in detail here.
  • each PA in the communication device is connected to only one radio frequency link as an example for illustration, but the number of radio frequency links that each PA can actually be connected to is not limited to one.
  • different PAs may be connected to different radio frequency links, or may be connected to the same radio frequency link, which is not particularly limited in this embodiment of the present application.
  • the input end of the ET link is connected to the input end of the at least one radio frequency link.
  • the ET link is configured to determine a power supply voltage provided for the at least one PA according to an input signal of the at least one radio frequency link, and supply power to the at least one PA according to the power supply voltage.
  • the power supply voltages provided by the ET link to the at least one PA are the same.
  • the signal waveform of the power supply voltage provided by the ET link to the at least one PA is an envelope shape.
  • the signal energy amplitude corresponding to any moment is greater than the maximum value of the signal energy amplitude of the input signal of the at least one radio frequency link at this moment.
  • the feedback link may respectively acquire an output signal of each PA.
  • the first parameter and the second parameter of the corresponding PA can be determined according to the output signal of each PA, and the first parameter and the second parameter of each PA can be output through the output terminal. parameter.
  • the first parameter of any PA is used to characterize the nonlinear distortion characteristic of the PA
  • the second parameter of any PA is used to characterize the nonlinear distortion characteristic of the ET link for the PA.
  • each radio frequency link may receive the first parameter of the PA corresponding to the radio frequency link output by the feedback link, and transmit the parameter on the radio frequency link according to the received first parameter.
  • the digital pre-distortion correction processing is performed on the signal to cancel the nonlinear distortion caused by the nonlinear distortion characteristic of the PA when the signal on the radio frequency link passes through the corresponding PA.
  • the ET link may receive the second parameter of each PA output by the feedback link, and perform digital processing on the signal on the ET link according to the latest received second parameter
  • the pre-distortion correction process is to cancel the nonlinear distortion of the signal passing through the at least one PA caused by the nonlinear distortion characteristic of the ET link when the ET link supplies power to the at least one PA.
  • each radio frequency link and feedback link are processed by digital pre-distortion correction, which can maximize the improvement of the signal generated when the signal passes through the PA.
  • nonlinear distortion an output signal with high linearity is obtained.
  • the adjacent-band nonlinear leakage of the output signal of the power module in the ET link is lower than the adjacent-band nonlinear leakage of the input signal of the power module, and the adjacent-band leakage ratio of the output signal of each PA is lower than
  • the adjacent band leakage ratio of the input signal of the corresponding PA can ensure that the output signal of each PA has a high linearity. Therefore, the above solution can improve the linearity of the PA output signal, thereby improving the working performance and efficiency of the PA, and at the same time, can improve the signal transmission performance of the communication device.
  • FIG. 5a is a schematic diagram of comparison of input and output signals of a power module provided in an embodiment of the present application.
  • FIG. 5a it can be seen from the comparison that the adjacent-band nonlinear leakage of the actual output signal of the ET link is lower than the adjacent-band nonlinear leakage of the input signal of the ET link.
  • the digital pre-distortion process is performed on the signal in the ET link, so the error between the actual output signal of the power module and the ideal output signal (that is, the output signal when there is no nonlinearity in the ET link) is smaller and closer to in the ideal output signal. Therefore, in the solution provided by the embodiment of the present application, the linearity of the ET link output signal can be improved, thereby reducing the impact on the linearity of the PA.
  • Fig. 5b is a schematic diagram of a comparison of input and output signals of a PA provided by an embodiment of the present application.
  • FIG. 5 b it can be seen from the comparison that the adjacent band leakage of the output signal of the PA is lower than the adjacent band leakage of the input signal of the PA.
  • digital predistortion processing is performed on the signal in the RF link, and digital predistortion processing is also performed on the signal in the ET link. Therefore, the adjacent band leakage of the corresponding output signal after the RF link signal passes through the PA will be If it decreases, the linearity of the corresponding output signal will increase. Therefore, in the solution provided by the embodiment of the present application, the linearity of the output signal of the PA can be improved, thereby improving the working performance of the PA.
  • the communication device provided in the embodiment of the present application will be described in detail below by taking the communication device provided in the embodiment of the present application including one radio frequency link and including multiple radio frequency links as examples.
  • Embodiment 1 Single radio frequency link scenario
  • the communication device may include: a first radio frequency link 601 and a PA connected to the radio frequency link.
  • the first PA 602 connected to the first radio frequency link 601, as well as the ET link 603 and the feedback link 604.
  • the input end of the first PA 602 is connected to the output end of the first radio frequency link 601, and the power supply end of the first PA 602 is connected to the output end of the ET link 603 , the output end of the first PA 602 is connected to the input end of the feedback link 604 through a coupler, the input end of the ET link 603 is connected to the input end of the first radio frequency link 601, and the Output ends of the feedback link 604 are respectively connected to the first radio frequency link 601 and the ET link 603 .
  • the first radio frequency link 601, the ET link 603 and the feedback link 604 are introduced respectively below.
  • the first radio frequency link 601 is 1. The first radio frequency link 601
  • the target radio frequency link in the communication device may include: a radio frequency processing module and a first digital predistortion module; wherein, the target radio frequency link may be each of at least one radio frequency link included in the communication device or, the target radio frequency link may be any one or more of at least one radio frequency link included in the communication device.
  • the first radio frequency link 601 may include: a radio frequency processing module, a first digital predistortion module.
  • the first input end of the first digital pre-distortion module is the input end of the first radio frequency link 601
  • the output end of the first digital pre-distortion module is connected to the input end of the radio frequency processing module
  • the output end of the radio frequency processing module is the output end of the first radio frequency link 601 .
  • the first digital pre-distortion module is configured to perform digital pre-distortion processing on the input signal of the first radio frequency link 601 .
  • the radio frequency processing module is used to perform radio frequency processing on the signal output by the first digital pre-distortion module, for example, it can perform digital-to-analog conversion processing, frequency up-conversion processing, filtering processing, etc., which can be determined according to actual business requirements.
  • the output end of the feedback link 604 includes a first output end, the first output end is used to output the first parameter of the first PA 602, and the second input of the first digital pre-distortion module The terminal is connected to the first output terminal of the feedback link 604. Then the first digital pre-distortion module may perform digital pre-distortion processing on the input signal of the first radio frequency link 601 according to the first parameter from the feedback link 604 . Specifically, the first digital pre-distortion module may receive the first parameter of the first PA 602 output by the first output end of the feedback link 604, and according to the first parameter of the first PA 602, Perform digital predistortion processing on the input signal of the first radio frequency link 601 .
  • the first parameter is used to characterize the nonlinear distortion characteristic of the first PA 602, therefore, the first digital predistortion module can estimate the Non-linear distortion occurs to the signal after passing through the PA, so that the input signal of the first radio frequency link 601 is subjected to digital pre-distortion processing opposite to the characteristics of the non-linear distortion.
  • the first radio frequency link 601 may be a radio frequency transmission link, for example, it may be a radio frequency transmission link/radio frequency transmission channel in the communication system shown in FIG. 3a.
  • the structure and composition of the first radio frequency link 601 shown in FIG. 6 is only used as an implementable manner of the radio frequency link in the embodiment of the present application.
  • the first radio frequency link 601 is not limited to include the above-mentioned structures or modules, and other related structures or modules can be added to the first radio frequency link 601.
  • the first radio frequency link 601 Each module can also be further divided into different modules, or modules can be combined.
  • the communication device may further include an antenna, configured to broadcast a signal of the communication device.
  • the antenna can be connected to the output end of the first PA 602, and then the antenna can send the signal output by the first PA 602, for example, to other communication devices.
  • the radio frequency processing module on the first radio frequency link 601 may further include a digital-analog converter (digital-analog converter) module and an up-conversion module.
  • a digital-analog converter digital-analog converter
  • the input end of the digital-to-analog conversion module is connected to the output end of the first digital pre-distortion module
  • the output end of the digital-to-analog conversion module is connected to the input end of the up-conversion module
  • the up-conversion module The output terminal of is connected with the input terminal of the first PA 602.
  • the digital-to-analog conversion module is used to convert the digital signal from the first digital pre-distortion module into an analog signal
  • the up-conversion module is used to perform up-conversion processing on the analog signal output by the digital-to-analog conversion module, and Send the processed signal to the first PA 602, so that the first PA 602 performs signal power amplification processing, and broadcasts the amplified signal through the antenna.
  • the first PA 602 may also be a structure in which multiple PAs are cascaded (for convenience of description, it may still be referred to as the first PA 602). Then the first parameter of the first PA 602 determined by the feedback link 604 essentially reflects the overall nonlinear distortion characteristic of multiple cascaded PAs.
  • the first radio frequency link 601 can first perform pre-distortion processing on the input signal, and then send the pre-distortion processed signal to the first PA 602, thereby improving the linearity of the signal after passing through the first PA 602.
  • the ET link 603 includes a power module; as shown in FIG. 6, the output end of the power module is connected to the power supply end of the first PA 602.
  • the power module may be used to generate a power supply voltage provided to the at least one PA; wherein, in a steady state, the adjacent band nonlinear leakage of the output signal of the power module is lower than that of the input signal of the power module. with non-linear leakage.
  • the ET link 603 may further include: an envelope shaping module and a second digital predistortion module. As shown in FIG. 6, the input end of the envelope shaping module is connected to the input end of the first radio frequency link 601, and the output end of the envelope shaping module is connected to the second digital predistortion module. An input terminal is connected; the output terminal of the second digital pre-distortion module is connected with the input terminal of the power supply module.
  • the envelope shaping module is configured to perform envelope shaping processing on the input signal of the first radio frequency link 601 to obtain a target envelope signal.
  • the amplitude of the target envelope signal is greater than or equal to the amplitude of the input signal of the first radio frequency link 601
  • the energy amplitude of the target envelope signal is greater than or equal to the amplitude of the first radio frequency link 601
  • An energy magnitude of an input signal of an RF link 601 it can be ensured that the power supply of the ET link 603 is sufficient for the first PA 602.
  • the second digital pre-distortion module is configured to perform digital pre-distortion processing on the target envelope signal; the power supply module is configured to generate the power supply voltage according to a signal output by the second digital pre-distortion module.
  • the output end of the feedback link 604 includes a second output end, the second output end is used to output the second parameter of the first PA 602, and the second input end of the second digital pre-distortion module is connected to The second output end of the feedback link 604 is connected, then the second digital pre-distortion module can perform digital pre-distortion on the signal on the ET link 603 according to the second parameter from the feedback link 604 deal with.
  • the second digital pre-distortion module may receive the second parameter of the first PA 602 output by the second output end of the feedback link 604, and according to the received first PA 602
  • the second parameter is to perform digital pre-distortion processing on the target envelope signal output by the envelope shaping module.
  • the second parameter is used to characterize the nonlinear distortion characteristic of the ET link 603, therefore, the second digital pre-distortion module can estimate the signal on the ET link 603 according to the second parameter (That is, the nonlinear distortion that occurs when the target envelope signal) is transmitted on the ET link 603, so that the signal on the ET link 603 is subjected to digital pre-distortion processing that is opposite to the characteristics of the nonlinear distortion, thereby reducing the Effect of nonlinear distortion characteristics of ET link 603 on first PA 602.
  • the second parameter That is, the nonlinear distortion that occurs when the target envelope signal
  • the structural composition of the ET link 603 shown in FIG. 6 or FIG. 7 is only used as an implementable manner of the radio frequency link in the embodiment of the present application.
  • the ET link 603 is not limited to include the above-mentioned structures or modules, and other related structures or modules can be added to the ET link 603, and each module on the ET link 603 can also be It is further divided into different modules, or modules are merged, etc.
  • the ET link 603 may further include a LUT module.
  • the LUT module is located between the envelope shaping module and the second digital predistortion module.
  • the input end of the LUT module is connected to the output end of the envelope shaping module, and the output end of the LUT module is connected to the input end of the second digital predistortion module.
  • the LUT module may be used as a storage table and a look-up table for predistortion parameters of the second digital predistortion module. After the second digital pre-distortion module obtains the second parameter of the first PA 602, it can be stored in the LUT module.
  • the second parameter can be loaded from the LUT module, and the nonlinear characteristic opposite to the nonlinear distortion characteristic of the ET link 603 can be configured according to the second parameter, thereby canceling the nonlinear distortion characteristic of the ET link 603, thereby Realize the linear output of the ET link 603, and reduce the nonlinear interference to the first PA 602.
  • the ET link 603 further includes a selection module.
  • the input end of the selection module is connected to the input end of the first digital pre-distortion module, or connected to the output end of the first digital pre-distortion module, and the output end of the selection module is connected to the envelope shaping module connect.
  • the selection module adopts a closed-loop control method, and can be used to select to transmit the input signal of the first digital pre-distortion module to the second digital pre-distortion module, or select to transmit the output signal of the first digital pre-distortion module to the The second digital pre-distortion module.
  • the power supply module may further include a digital-to-analog conversion module and an ETM power supply (supply).
  • the ETM power supply is referred to as ETM for short.
  • the input end of the digital-to-analog conversion module is connected to the output end of the second digital pre-distortion module, and is used to perform digital-to-analog conversion on the output signal of the second digital pre-distortion module, and send the converted signal to
  • the ETM can generate a corresponding power supply voltage according to the signal from the digital-to-analog conversion module, and provide it to the first PA 602 through an output terminal.
  • the nonlinear distortion of the ET link 603 mainly comes from ETM.
  • the ET link 603 can first perform pre-distortion processing on the input signal, and then determine the power supply voltage provided to the first PA 602 according to the pre-distortion processed signal. Due to the nonlinear distortion characteristics of the ET link 603 Digital pre-distortion processing is performed, so the influence of the nonlinear distortion characteristic of the ET link 603 on the first PA 602 can be reduced, thereby improving the linearity of the signal after passing through the first PA 602.
  • the feedback link 604 may include: a feedback module, an analog-to-digital conversion module, and a processing module.
  • the input end of the feedback module is connected with the output end of the first PA 602
  • the output end of the feedback module is connected with the input end of the analog-to-digital conversion module, and the analog-to-digital conversion
  • the output terminal of the module is connected to the input terminal of the processing module
  • the first output terminal of the processing module is connected to the second input terminal of the first digital predistortion module
  • the second output terminal of the processing module is connected to the second digital predistortion module.
  • the second input end of the predistortion module is connected.
  • the feedback module is configured to acquire the output signal of the first PA 602, and send the output signal of the first PA 602 to the analog-to-digital conversion module.
  • the feedback module can acquire the output signal of the first PA 602 through coupled sampling.
  • the feedback module may be implemented as a coupler.
  • the analog-to-digital conversion module is configured to perform analog-to-digital conversion processing on the output signal of the first PA 602, and send the processed output signal of the first PA 602 to the processing module.
  • the processing module is configured to perform parameter extraction processing on the output signal of the first PA 602 to obtain a first parameter and a second parameter of the first PA 602.
  • the process of parameter extraction processing includes the following steps 1 to 3:
  • Step 1 The processing module determines an error signal between the output signal of the first PA 602 and the input signal of the first radio frequency link 601.
  • the processing module can divide the output signal of the first PA 602 by the gain coefficient of the first PA 602 to obtain a normalized output signal of the first PA 602, and then divide the The input signal of the first radio frequency link 601 is subtracted from the normalized output signal of the first PA 602 to obtain the error signal.
  • the processing module may calculate the error signal according to the following formula:
  • e(k) is the error signal
  • x(k) is the input signal of the first radio frequency link 601
  • y(k) is the output signal of the first PA 602
  • g is the first The gain factor (or amplification factor or normalized complex gain) of the PA 602.
  • the error signal may be used as a model target to construct a nonlinear model of the communication device through a nonlinear modeling method.
  • a linear model can be used to represent the relationship between the error signal and the transfer function of the first radio frequency link 601 and the transfer function of the ET link 603. Therefore, the nonlinear model can be expressed as the following formula The abstract form shown:
  • e(k) is the error signal
  • x(k) is the input signal of the first radio frequency link 601
  • v(k) is the input signal of the second digital pre-distortion module
  • H 1 [ ⁇ ] is the transfer function (i.e. the first transfer function) of the first digital pre-distortion module
  • H 2 [ ] is the transfer function (i.e. the second transfer function) of the second digital pre-distortion module
  • F[ ] It is a function reflecting the data coupling relationship between H 1 [ ⁇ ] and H 2 [ ⁇ ].
  • Step 2 The processing module acquires the first transfer function and the second transfer function.
  • the first transfer function is used to characterize the relationship between the input signal of the first radio frequency link 601 and the output signal of the first PA 602
  • the second transfer function is used to characterize the ET chain
  • the first parameter of the first PA 602 is an unknown parameter in the first transfer function
  • the second parameter of the first PA 602 is the second Unknown parameter in transfer function.
  • the processing module may respectively select the first transfer function corresponding to the first radio frequency link 601 and the second transfer function corresponding to the ET link 603 from a plurality of preset candidate transfer functions. transfer function.
  • the plurality of candidate transfer functions are all basis functions, and key parameters in the plurality of candidate transfer functions need to be determined according to actual transfer characteristics of the communication link.
  • the multiple candidate transfer functions described in the embodiments of the present application can be directly obtained from the currently existing transfer functions. choose.
  • the multiple candidate transfer functions may include a memory polynomial (memory polynomial, MP), a generalized memory polynomial (general memory polynomial, GMP), and the like.
  • the transfer function of the first digital pre-distortion module is H 1 [ ⁇ ] in the formula of the above nonlinear model, and H 1 [ ⁇ ] is the input signal x( k) related functions
  • the transfer function of the first digital pre-distortion module is H 2 [ ⁇ ] in the formula of the above-mentioned nonlinear model
  • H 2 [ ⁇ ] is the input signal with the second digital pre-distortion module Functions related to v(k).
  • the processing module selects and obtains the transfer functions of the first digital pre-distortion module and the second digital pre-distortion module, it may construct the above-mentioned nonlinear model based on the corresponding transfer functions.
  • Step 3 The processing module calculates the first parameter and the second parameter of the first PA 602 according to the error signal, the first transfer function and the second transfer function.
  • the processing module may adopt any of the following ways 1 and 2 to solve the first parameter and the second parameter of the first PA602.
  • the processing module determines a target transfer function according to the first transfer function and the second transfer function; wherein the target transfer function is used to characterize the first transfer function and the second transfer function
  • the data coupling relationship between, the unknown parameters in the target transfer function include the first parameter and the second parameter of the first PA 602.
  • the unknown parameters in the target function are calculated to obtain the first parameter and the second parameter of the first PA 602.
  • the processing module uses a parameterized method to solve the unknown parameters.
  • the expressions of the first transfer function and the second transfer function are known, so the expressions of the second transfer function and the second transfer function can be
  • the expression to construct the target transfer function is the above-mentioned F[ ⁇ ]
  • the value of the target transfer function is the error signal, which is the above-mentioned e(k), so the target transfer function can be expanded to solve the unknown parameters.
  • the processing module establishes a nonlinear model for representing the correspondence between the error signal, the first transfer function, and the second transfer function, calculates a norm of the error signal, and converts the The norm of the error signal is used as the objective function of the nonlinear model, and the unknown parameters in the first transfer function and the second transfer function are solved to obtain the first parameter and the corresponding first PA 602 second parameter.
  • the processing module uses a non-parameterized method to solve the unknown parameters. Specifically, the processing module may ignore the construction of the target transfer function in the above method 1, but directly solve the unknown parameters in the first transfer function and the second transfer function.
  • the processing module can use the norm of the error signal as the objective function of the nonlinear model to solve H 1 [ ⁇ ] and H 2 [ ⁇ ] respectively , so as to obtain the first parameter and the second parameter.
  • the value of the unknown parameter in the functions H 1 [ ⁇ ] and H 2 [ ⁇ ] when the value of the objective function is minimized is the solution of the unknown parameter sought.
  • the processing module may perform the above step 1 on the input signal of each radio frequency link according to the output signal of the first PA 602 ⁇ Step 3, so as to obtain the first parameter corresponding to the radio frequency link obtained by using the input signal of each radio frequency link, and send the obtained first parameter to the corresponding radio frequency link, then each radio frequency chain
  • the channel may perform digital pre-distortion processing on the signal input to the radio frequency link according to the first parameter corresponding to the radio frequency link.
  • the structural composition of the feedback link 604 shown in FIG. 6 or FIG. 7 is only used as a realizable manner of the radio frequency link in the embodiment of the present application.
  • the feedback link 604 is not limited to include the above structures or modules, other related structures or modules can be added to the feedback link 604, and each module on the feedback link 604 can also be further divided For different modules, or to merge modules, etc.
  • the first parameter described in the embodiment of the present application may be a single parameter, or a group of parameters including multiple parameters. The second parameter is the same.
  • the feedback link may adopt an interleaved training manner to update parameters of the first digital pre-distortion module and the second digital pre-distortion module.
  • the feedback link can first train any module in the first digital pre-distortion module and the second digital pre-distortion module for a set number of times (greater than or equal to once), and then perform a set number of times for the other module after completion training.
  • the above two training processes are executed alternately to ensure optimal system linearity and signal processing efficiency.
  • the feedback link can obtain the output signal of the PA through multiple coupling sampling, and calculate the first digital pre-distortion module according to the obtained output signal The corresponding first parameter or the second parameter corresponding to the second digital pre-distortion module.
  • the feedback link respectively sends the first parameter and the second parameter obtained through multiple calculations to the corresponding first digital predistortion module and the second digital predistortion module.
  • the first digital pre-distortion module or the second digital pre-distortion module may perform digital pre-distortion processing on the signal according to the latest received parameters.
  • the nonlinear distortion characteristic parameters of the PA and ET link are calculated separately above, and based on this, the digital predistortion processing for the nonlinearity of the PA and the nonlinearity of the ET link can be performed separately, which can improve the linearity of the ET link and the PA, and at the same time can Ensure the efficiency of the transmission chain.
  • the communication device only needs to add a feedback link at the output end of the PA to calculate the nonlinear distortion characteristic parameters of the PA and the nonlinear distortion characteristic parameters of the ET link, and according to the calculated parameters , respectively carry out digital predistortion processing for PA nonlinearity and ET link nonlinearity, which can reduce the influence of system nonlinearity on the signal processing performance of PA, further improve the signal processing performance and efficiency of PA, and the corresponding overall system work Performance will also be significantly improved.
  • a feedback link in the communication device can realize the feedback of PA nonlinearity and ET link nonlinearity, so there is no need to add a feedback link for the ET link alone, which can reduce the impact on the system after adding the feedback link. Influenced by the degree of integration, it can meet the relatively compact system distribution requirements, therefore, the scheme has high implementability.
  • Embodiment 2 multi-radio link scenario
  • the following uses an example in which the communication device includes three radio frequency links and each radio frequency link is connected to a PA for illustration.
  • the three radio frequency links are a first radio frequency link 801 , a second radio frequency link 802 and a third radio frequency link 803 .
  • the structure of each radio frequency link may refer to the first radio frequency link 601 shown in FIG. 6 or FIG. 7 above, which will not be repeated here.
  • the PAs corresponding to the first radio frequency link 801, the second radio frequency link 802, and the third radio frequency link 803 are a first PA 804, a second PA 805, and a third PA 806, respectively.
  • the three PAs are respectively connected to the same ET link 807 and the same feedback link 808, wherein the connection method of each PA can also refer to the connection method of the first PA 602 shown in the above-mentioned FIG. 6 or FIG. Let me repeat.
  • the three signals input to the three radio frequency links may be the same stream or layer after precoding (precoding) can also be signals of different streams or layers.
  • the envelope shaping module in the ET link 807 performs joint envelope processing on the three signals to obtain a shared envelope signal (i.e. the target envelope signal described in the above embodiment), and the envelope signal is processed It is sent to the second digital pre-distortion module for digital pre-distortion processing, and then the final multi-channel shared envelope signal is obtained through the power supply module.
  • the power supply module provides the first radio frequency link 801, the second radio frequency Link 802 and third radio frequency link 803 provide power.
  • the signal amplitude value corresponding to each moment is greater than or equal to the maximum value among the input signal amplitude values of the three radio frequency links corresponding to the moment.
  • the structure or signal processing mode of the ET link 807 may refer to the structure or signal processing mode of the ET link 603 shown in FIG. 6 or FIG. 7 , which will not be repeated here.
  • the feedback modules in the feedback link 808 may be sorted according to the settings of at least one PA included, sequentially select one of the at least one PA, and obtain the output of the one PA signal, and sending the output signal of the one PA to an analog-to-digital conversion module.
  • the feedback module may be implemented as a multiplex switch (such as a single-pole multiple-throw switch), and the multiple input terminals of the multiplex switch are respectively connected to the output terminals of multiple PAs.
  • the output terminal of the channel selection switch is connected with the input terminal of the analog-to-digital conversion module.
  • the feedback module may separately sample the output signal of each PA in a switch polling manner.
  • the communication device when the communication device includes three radio frequency links and corresponding three PAs, the three input terminals of the feedback module are respectively connected to the output terminals of the three PAs, and the output terminals of the feedback module The end is connected with the input end of the analog-to-digital conversion module.
  • the feedback module can sequentially sample the output signals of the first PA 804, the second PA 805 and the third PA 806 through the three coupling ports, and send them to the analog-to-digital conversion module in sequence.
  • the analog-to-digital conversion module performs analog-to-digital conversion on the received signal and sends it to the processing module.
  • the processing module can calculate the first parameter and the second parameter of the first PA 804 according to the signal after receiving the signal corresponding to the first PA 804; after receiving the signal corresponding to the second PA 805, calculate the first parameter according to the signal The first parameter and the second parameter of the second PA 805; after receiving the signal corresponding to the third PA 806, calculate the first parameter and the second parameter of the third PA 806 according to the signal.
  • the processing module calculates the first parameter and the second parameter of each PA
  • the calculated parameters are respectively sent to the first digital predistortion module on the corresponding radio frequency link or the second digital predistortion module on the ET link 807 , each of the first digital pre-distortion module and the second digital pre-distortion module can perform corresponding digital pre-distortion processing on the passed signal.
  • the feedback link 808 may also include a radio frequency processing module, which may be located between the feedback module and the digital-to-analog conversion module, and may be used to perform some radio frequency processing on the signal from the PA.
  • a radio frequency processing module which may be located between the feedback module and the digital-to-analog conversion module, and may be used to perform some radio frequency processing on the signal from the PA. Processing, such as down-conversion processing, filtering processing, etc., can be determined according to actual service needs, and is not specifically limited here.
  • each link shown in FIG. 8 or FIG. 9 is only used as an implementable manner of the corresponding link in the embodiment of the present application.
  • each link is not limited to include the above-mentioned structures or modules, and other related structures or modules can also be added or some modules can be reduced.
  • Each module on each link can also be further divided into different modules, or the module merge etc.
  • the feedback link 808 may also jointly process the output signals of the PAs corresponding to some radio frequency links in the multiple radio frequency links.
  • the feedback link 808 can only be connected to the output terminals of the first PA 804 and the second PA 805, then the feedback link 808 can only be connected to the first parameter of the first PA 804, the second PA 805 and the first parameter of the second PA 805.
  • the second parameter is determined and the subsequent feedback processing.
  • the communication device uses a single feedback channel, that is, a shared feedback link, and performs only the output signal of the PA corresponding to the radio frequency link. Acquisition and feedback to complete the acquisition and update of the digital predistortion processing parameters of the ET link and multiple radio frequency links.
  • digital pre-distortion processing can be performed on PA nonlinearity and ET link nonlinearity respectively, thereby improving the linearity of ET link and PA, and further improving the signal processing performance and efficiency of PA.
  • multiple radio frequency links can share one feedback link and ET link, so adding a feedback link has little impact on system integration and can meet the requirements of relatively compact system distribution. Therefore, the above The feasibility of the program is high.
  • the embodiment of the present application also provides a signal processing method, which is applied to the feedback link in the communication device, the communication device also includes an ET link, and at least one radio frequency link is used to output A radio frequency signal, and a first PA for receiving the output radio frequency signal; wherein, the input end of the first PA is connected to the output end of the at least one radio frequency link, and the power supply end of the first PA is connected to the The output end of the ET link is connected, and the output end of the first PA is connected to the input end of the feedback link through a coupler.
  • the method can be applied to the feedback link in the communication device as shown in any one of the schematic diagrams in FIG. 4 or FIG. 6 to FIG. 9 above. As shown in Figure 10, the method includes:
  • the feedback link acquires the output signal of the first PA; wherein the adjacent band leakage ratio of the output signal of the first PA is lower than the adjacent band leakage ratio of the input signal of the first PA.
  • the feedback link determines the first parameter and the second parameter of the first PA according to the output signal of the first PA; wherein, the first parameter of the first PA is used to characterize the non- The linear distortion characteristic, the second parameter of the first PA is used to characterize the nonlinear distortion characteristic of the ET link for the first PA.
  • the first PA may be one or more PAs in the communication device.
  • the first parameter of the first PA is used to perform digital predistortion processing on the input signal of the target radio frequency link; wherein the target radio frequency link is the One or more radio frequency links; the second parameter of the first PA is used to perform digital predistortion processing on signals on the ET link.
  • determining the first parameter and the second parameter of the first PA according to the output signal of the first PA includes: determining the relationship between the output signal of the first PA and the target radio frequency link The error signal between the input signals of the input signal; obtain the first transfer function and the second transfer function; wherein, the first transfer function is used to characterize the difference between the input signal of the target radio frequency link and the output signal of the first PA The relationship between the second transfer function is used to characterize the relationship between the input signal and the output signal of the ET link, the first parameter is an unknown parameter in the first transfer function, and the second The parameters are unknown parameters in the second transfer function; the first parameter and the second parameter are calculated according to the error signal, the first transfer function and the second transfer function.
  • determining the error signal between the output signal of the first PA and the input signal of the target radio frequency link includes: combining the output signal of the first PA with the first PA The gain coefficient of the first PA is divided to obtain the normalized output signal of the first PA; the input signal of the target radio frequency link is subtracted from the normalized output signal of the first PA to obtain the error signal.
  • calculating the first parameter and the second parameter according to the error signal, the first transfer function and the second transfer function includes: according to the first transfer function and the second transfer function to determine a target transfer function; wherein the target transfer function is used to characterize the data coupling relationship between the first transfer function and the second transfer function, and the target transfer function in The unknown parameters include the first parameter and the second parameter; after the error signal is used as the function value of the target transfer function, the unknown parameters in the target function are calculated to obtain the first parameter and the second parameter.
  • calculating the first parameter and the second parameter according to the error signal, the first transfer function, and the second transfer function includes: establishing a A nonlinear model of the corresponding relationship between the signal and the first transfer function and the second transfer function; calculate the norm of the error signal; use the norm of the error signal as the target of the nonlinear model function, solving unknown parameters in the first transfer function and the second transfer function to obtain the first parameter and the second parameter.
  • an embodiment of the present application also provides a device, the device includes a processor and a memory; the memory is used to store computer program instructions; the processor is used to execute the computer program stored in the memory The instruction realizes the signal processing method provided by the above-mentioned embodiment.
  • the embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program runs on a computer, the computer executes The signal processing method provided by the above embodiments.
  • the embodiment of the present application also provides a computer program product, the computer program product includes a computer program or an instruction, when the computer program or instruction is run on a computer, it causes the computer to execute the above-mentioned The signal processing method provided by the embodiment.
  • embodiments of the present application further provide a chip, where the chip includes the communication device provided in the above embodiments.
  • the embodiments of the present application further provide an electronic device, the electronic device includes the communication device provided in the above embodiments, or the electronic device includes the above chip.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) having computer-usable program code embodied therein.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
  • the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)

Abstract

La présente demande divulgue un appareil de communication et un procédé de traitement de signal. L'appareil comprend une liaison de suivi d'enveloppe (ET), une liaison de rétroaction, au moins une liaison radiofréquence pour délivrer en sortie un signal radiofréquence, et un premier amplificateur de puissance (PA) pour recevoir le signal radiofréquence délivré en sortie; une extrémité d'entrée du premier PA est connectée à une extrémité de sortie de l'au moins une liaison radiofréquence, une extrémité d'alimentation du premier PA est connectée à une extrémité de sortie de la liaison ET, et une extrémité de sortie du premier PA est connectée à une extrémité d'entrée de la liaison de rétroaction au moyen d'un coupleur; la liaison ET est configurée pour fournir une tension d'alimentation; le premier PA est configuré pour utiliser, au moyen de l'extrémité d'alimentation, la tension d'alimentation fournie par la liaison ET, et pour effectuer un traitement d'amplification de puissance sur le signal radiofréquence délivré en sortie et pour délivrer en sortie un signal traité; un rapport de fuite de bande adjacente d'un signal de sortie du premier PA est inférieur à un rapport de fuite de bande adjacente d'un signal d'entrée; la liaison de rétroaction est configurée pour obtenir le signal de sortie du premier PA. La solution divulguée dans la présente demande peut améliorer la linéarité du signal de sortie du PA.
PCT/CN2021/132847 2021-11-24 2021-11-24 Appareil de communication et procédé de traitement de signal WO2023092341A1 (fr)

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Citations (4)

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US20140213196A1 (en) * 2013-01-31 2014-07-31 Andreas Langer Recalibration of envelope tracking transfer function during active transmission
US20160164550A1 (en) * 2014-12-09 2016-06-09 Intel Corporation Envelope tracking path delay fine tuning and calibration
CN105703719A (zh) * 2014-12-10 2016-06-22 英特尔公司 校正包络线追踪系统中功率放大器负载特性的方法和装置
CN105991096A (zh) * 2015-03-20 2016-10-05 英特尔Ip公司 基于输出信号调节功率放大器激励

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140213196A1 (en) * 2013-01-31 2014-07-31 Andreas Langer Recalibration of envelope tracking transfer function during active transmission
US20160164550A1 (en) * 2014-12-09 2016-06-09 Intel Corporation Envelope tracking path delay fine tuning and calibration
CN105703719A (zh) * 2014-12-10 2016-06-22 英特尔公司 校正包络线追踪系统中功率放大器负载特性的方法和装置
CN105991096A (zh) * 2015-03-20 2016-10-05 英特尔Ip公司 基于输出信号调节功率放大器激励

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