Wireless communication device, system and signal processing method

Abstract

The present application discloses a wireless communication device, system, and signal processing method, which relate to the field of communication technology and help stabilize the characteristics of a power amplifier in a TDD scenario, thereby helping to improve the linearization performance of a DPD system. The wireless communication device includes a power amplifier and a bias circuit. The power amplifier includes a signal input port, a signal output port, a power supply port, and a bias port. The power amplifier is used to receive a power supply signal from the power supply port, a bias signal from the bias port, and a radio frequency signal from the signal input port, and output the power-amplified radio frequency signal through the signal output port. The bias circuit is connected to the bias port and is used to generate a bias signal, wherein the timing characteristics of the bias signal are synchronized with the timing characteristics of the switching signal of the power amplifier in the TDD scenario to compensate for the nonlinear changes of the power amplifier in the TDD scenario.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technologies, and in particular to wireless communication devices, systems, and signal processing methods. Background Art

[0002] The RF power amplifier (PA) is a key component in the transmission link of modern communication systems. Its main function is to amplify low-power signals to the rated power level specified by the communication system standard through DC function, and then feed it into the back-end devices (such as duplexers, antennas, etc.) for wireless transmission.

[0003] In communications systems, to improve the PA's energy conversion efficiency, it is typically required to operate in the saturation range. During this period, the PA exhibits very strong nonlinear characteristics. These PA nonlinearities can degrade system transmission quality and impact adjacent band systems. To combat these PA nonlinearities, digital predistortion (DPD) technology has been introduced. The basic principle of DPD technology is to fit the PA's distortion characteristics using a nonlinear behavioral model and, based on the fitting results, derive an inverse function of the PA's distortion characteristics. This inverse function is then implemented using digital circuits at the digital baseband / IF frequency. This way, before being transmitted, the signal passes through two nonlinear modules, the DPD and the PA, with opposing characteristics. Their distortion characteristics cancel each other out, resulting in a linear system transmission characteristic.

[0004] The essence of a DPD system is to identify and model the nonlinear characteristics of a PA. This requires that the PA characteristics used for modeling remain consistent or minimally different from those used after the model is built. Otherwise, the learned characteristics will not be applied, leading to degraded system performance or even failure.

[0005] Because the PA input signal fluctuates in time division duplex (TDD) scenarios, while the PA input signal used in modeling is constant, in TDD scenarios, "what is learned is not used", resulting in deteriorated system performance or even malfunction. Summary of the Invention

[0006] The embodiments of the present application provide a wireless communication device, system, and method, which help stabilize the characteristics of the PA in a TDD scenario, thereby helping to improve the linearization performance of the DPD system.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] In a first aspect, a wireless communication device is provided, comprising: a power amplifier and a bias circuit. The power amplifier includes a signal input port, a signal output port, a power supply port, and a bias port. The power amplifier is configured to receive a power supply signal from the power supply port, a bias signal from the bias port, and a radio frequency signal from the signal input port, and output the amplified radio frequency signal through the signal output port. The bias circuit is connected to the bias port and configured to generate a bias signal, wherein the timing characteristics of the bias signal are synchronized with the timing characteristics of the power amplifier's switching signal in a TDD scenario to compensate for nonlinear variations of the power amplifier in the TDD scenario.

[0009] The switching signal of the power amplifier is used to control the switching timing of the power amplifier.

[0010] In this solution, in the TDD scenario, the timing characteristics of the bias signal of the power amplifier are synchronized with the timing characteristics of the switching signal of the power amplifier. Since the switching signal input signal of the power amplifier in the TDD scenario has the characteristic of sometimes high and sometimes low, the bias signal of the power amplifier has the characteristic of sometimes high and sometimes low. That is to say, in this solution, the voltage of the bias signal of the power amplifier is not a constant value. In the prior art, in the TDD scenario, the voltage of the bias signal of the power amplifier is a constant value. Therefore, compared with the prior art, the present technical solution changes the voltage value of the bias signal. Furthermore, since the bias signal affects the signal transmission characteristics of the power amplifier, changing the voltage value of the bias signal helps to change the signal transmission characteristics of the power amplifier, thereby helping to stabilize the characteristics of the power amplifier in the TDD scenario (that is, the degree of nonlinear change is reduced), and thus helping to improve the linearization performance of the DPD system (including DPD and power amplifier).

[0011] In one possible design, the bias circuit includes a smoothing filter circuit configured to receive a switching signal from a power amplifier and smooth-filter the switching signal to generate a bias signal. In this solution, the bias signal is directly generated by smooth-filtering the switching signal from the power amplifier.

[0012] Optionally, the bias circuit further includes a signal acquisition circuit for generating a switching signal for the power amplifier. The signal acquisition circuit can be implemented using a module / device used in conventional technologies to generate a switching signal for a power amplifier. Therefore, the bias signal can be generated by processing the conventional power amplifier switching signal without the need for specialized modules / devices. This helps save hardware overhead and reduces the complexity and cost of signal processing. Furthermore, the complexity and cost of digital signal processing, such as DPD, are not required.

[0013] In one possible design, the bias circuit includes: a smoothing filter circuit, configured to receive a TDD timing signal and perform smoothing filtering on the TDD timing signal to generate a bias signal.

[0014] The TDD timing signal is used to control the timing of the signal transmission switch of the TDD system.

[0015] Optionally, the bias circuit further includes a signal acquisition circuit for generating a TDD timing signal. The signal acquisition circuit can be implemented using a module / device used in conventional technologies to generate TDD timing signals. Therefore, the bias signal can be generated by processing existing TDD timing signals in conventional technologies without the need for specialized modules / devices. This helps save hardware overhead and reduces the complexity and cost of signal processing. Furthermore, the complexity and cost of digital signal processing, such as DPD, do not need to be increased.

[0016] In one possible design, the wireless communication device is applied to an ET system. The bias circuit includes a smoothing filter circuit configured to receive an envelope signal of the ET system and smooth-filter the envelope signal to generate a bias signal.

[0017] Optionally, the bias circuit further includes a signal acquisition circuit for generating an envelope signal. This signal acquisition circuit can be implemented using modules / devices used in conventional technologies for generating envelope signals. Therefore, the bias signal can be generated by processing existing envelope signals without the need for specialized modules / devices. This helps reduce hardware overhead and signal processing complexity and cost. Furthermore, it eliminates the need for increased complexity and cost of digital signal processing, such as DPD.

[0018] In a second aspect, a wireless communication device is provided, comprising: a power amplifier and a bias circuit. The power amplifier is applied in a TDD scenario. The power amplifier includes a signal input port, a signal output port, a power supply port, and a bias port. The power amplifier is configured to receive a power signal from the power supply port, a bias signal from the bias port, and an RF signal from the signal input port, and output the amplified RF signal through the signal output port. The bias circuit is connected to the bias port of the power amplifier, and is configured to receive a target signal and generate a bias signal based on the target signal; the target signal includes a switching signal of the power amplifier, a TDD timing signal, or an envelope signal of an ET system.

[0019] In this solution, in the TDD scenario, a bias signal is generated based on the switching signal or TDD timing signal or envelope signal of the power amplifier. Since the switching signal, TDD timing signal and envelope signal of the power amplifier all have the characteristics of sometimes high and sometimes low, and their timing characteristics are synchronized, it helps to make the bias signal of the power amplifier have the characteristics of sometimes high and sometimes low. That is to say, in this solution, the voltage of the bias signal of the power amplifier is not a constant value. In the prior art, in the TDD scenario, the voltage of the bias signal of the power amplifier is a constant value. Therefore, compared with the prior art, this technical solution changes the voltage value of the bias signal. Furthermore, changing the voltage value of the bias signal helps to change the transmission characteristics of the power amplifier, thereby helping to stabilize the characteristics of the power amplifier in the TDD scenario, and thus helping to improve the linearization performance of the DPD system.

[0020] In one possible design, the bias circuit includes a smoothing filter circuit configured to receive a target signal and perform smoothing filtering on the target signal to generate a bias signal.

[0021] In one possible design, the bias circuit further includes a signal acquisition circuit for generating a target signal.

[0022] Based on any of the technical solutions provided in the first or second aspect above, several optional solutions are provided below:

[0023] Optionally, the wireless communication device includes multiple power amplifiers and at least one bias circuit, wherein the at least one bias circuit is connected to bias ports of the multiple power amplifiers. In other words, multiple power amplifiers can share a single bias circuit, which helps save hardware resource overhead, reduce hardware implementation costs, and reduce hardware size. Therefore, this technical solution is particularly suitable for devices with strict cost and size requirements.

[0024] Optionally, a plurality of power amplifiers as described above belong to different radio frequency transmission channels respectively, and the different radio frequency transmission channels are used for multiple-input multiple-output MIMO communication.

[0025] According to a third aspect, a wireless communication device is provided, comprising: a first power amplifier and a bias circuit. The first power amplifier is configured to amplify an input signal (i.e., a radio frequency signal) input to a signal input port of the first power amplifier based on a bias signal fed to the bias port of the first power amplifier. The bias signal is configured to compensate for a characteristic of the first power amplifier that changes with changes in the input signal in a TDD scenario (equivalently, the bias signal is configured to compensate for nonlinear changes in the first power amplifier in a TDD scenario). The bias circuit is connected to the bias port. The bias circuit is configured to generate the bias signal and feed the bias signal to the bias port (i.e., send the bias signal to the bias port).

[0026] Since the input signal of the power amplifier in the TDD scenario has the characteristic of sometimes high and sometimes low, the voltage of the bias signal of the power amplifier is not a constant value. In the prior art, in the TDD scenario, the voltage of the bias signal of the power amplifier is a constant value. That is to say, compared with the prior art, the present technical solution changes the voltage value of the bias signal. Furthermore, since the bias signal affects the signal transmission characteristics of the power amplifier, changing the bias signal helps to change the signal transmission characteristics of the power amplifier, thereby helping to stabilize the characteristics of the power amplifier in the TDD scenario (that is, the degree of change with the change of the input signal of the power amplifier is reduced), thereby helping to improve the linearization performance of the DPD system (including DPD and power amplifier).

[0027] In one possible design, the bias circuit is specifically configured to generate a bias signal based on a switching signal of the first power amplifier in a TDD scenario.

[0028] In one possible design, the bias circuit includes: a switching signal generating unit for generating a switching signal for a first power amplifier; a digital shaping unit for shaping the switching signal for the first power amplifier; and a DAC for performing digital-to-analog conversion on the shaped signal to obtain a bias signal.

[0029] In one possible design, the bias circuit includes: a switching signal generating unit for generating a switching signal for a first power amplifier; a DAC for performing digital-to-analog conversion on the switching signal of the first power amplifier to obtain an analog signal of the switching signal of the first power amplifier; and an analog shaping unit for shaping the analog signal of the switching signal of the first power amplifier to obtain a bias signal.

[0030] In one possible design, the bias circuit is specifically configured to generate a bias signal based on a TDD timing signal.

[0031] In one possible design, the bias circuit includes: a TDD timing generation unit for generating a TDD timing signal; a digital shaping unit for shaping the TDD timing signal; and a DAC for performing digital-to-analog conversion on the shaped signal to obtain a bias signal.

[0032] In one possible design, the bias circuit includes a TDD timing generation unit for generating a TDD timing signal; a DAC for performing digital-to-analog conversion on the TDD timing signal to obtain an analog signal of the TDD timing signal; and an analog shaping unit for shaping the analog signal of the TDD timing signal to obtain a bias signal.

[0033] In one possible design, the wireless communication device is applied to an ET system, and the bias circuit is specifically configured to generate a bias signal based on an envelope signal of the ET system.

[0034] In one possible design, the bias circuit includes: an envelope generation unit for generating an envelope signal; a digital shaping unit for shaping the envelope signal; and a DAC for performing digital-to-analog conversion on the filtered signal to obtain a bias signal.

[0035] In one possible design, the bias circuit includes: an envelope generation unit for generating an envelope signal; a DAC for performing digital-to-analog conversion on the envelope signal to obtain an analog signal of the envelope signal; and an analog shaping unit for shaping the analog signal to obtain a bias signal.

[0036] The switching signal generating unit, the TDD timing generating unit and the envelope generating unit can all be implemented by modules / devices used in traditional technologies to generate envelope signals of ET systems, thereby helping to save hardware overhead and reducing the implementation complexity and cost of signal processing.

[0037] In one possible design, the wireless communication device further includes a training unit, wherein a signal input port of the training unit is connected to a signal input port and a signal output port of the first power amplifier, and a signal output port of the training unit is connected to the first DPD. The bias circuit is further configured to adjust parameters of the bias circuit to generate a pre-bias signal; the bias signal is a pre-bias signal that satisfies the requirement of "compensating for the characteristic of the first power amplifier varying with input signal in a TDD scenario." The pre-bias signal is used to adjust the relationship between the output signal and input signal of the first power amplifier. The training unit is configured to perform training based on the output and input signals of the first power amplifier to obtain model coefficients for the first DPD and transmit the model coefficients to the first DPD. The model coefficients ensure that the characteristics of the first DPD satisfy the inverse function of the characteristic of the output signal of the first power amplifier varying with input signal in a TDD scenario (i.e., the signal transmission characteristics of the first power amplifier). In this case, the first DPD is specifically configured to perform pre-distortion processing on the first signal to be processed based on the model coefficients. The bias circuit is specifically configured to generate the bias signal based on target parameters; the target parameters are the parameters of the bias circuit when the training unit obtains the model coefficients.

[0038] In this technical solution, the signal transmission characteristics of the first power amplifier are changed by adjusting the parameters of the bias circuit. A feedback loop is then established to track this change. Subsequently, training is performed on the tracked information to obtain the model coefficients of the first DPD and the parameters used to generate the bias signal when the condition "the output signal of the first power amplifier varies with the input signal in a TDD scenario" is satisfied. This is only one example of how to obtain the model coefficients of the first DPD and the parameters used to generate the bias signal, and the embodiments of the present application are not limited thereto.

[0039] In one possible design, the training unit is specifically configured to perform training based on the output signal and input signal of the first power amplifier and a model extraction algorithm to obtain model coefficients of the first DPD. Optionally, the model extraction algorithm includes a least squares method or a minimum mean square error algorithm.

[0040] In one possible design, a wireless communication device includes a first transmission channel and a second transmission channel; the first transmission channel includes a first power amplifier and a first DPD. The second transmission channel includes: a second power amplifier, which is used to amplify an input signal received by a signal input port of the second power amplifier based on a bias signal fed into the bias port of the second power amplifier. The bias signal is also used to compensate for the characteristics of the second power amplifier that change with the input signal in a TDD scenario. Based on this technical solution, in a MIMO scenario, the power amplifiers of multiple transmission channels can share one bias signal. This helps to save hardware resource overhead, reduce hardware implementation costs and reduce hardware volume. Therefore, this technical solution is particularly suitable for equipment with strict cost and volume requirements.

[0041] In a third aspect, a signal processing method is provided, which is applied to a wireless communication device, wherein the wireless communication device includes a power amplifier; the method includes: generating a bias signal, wherein the timing characteristics of the bias signal are synchronized with the timing characteristics of the switching signal of the power amplifier in the TDD scenario to compensate for the nonlinear changes of the power amplifier in the TDD scenario; enabling the power amplifier, and amplifying the input signal of the power amplifier based on the bias signal and the power supply signal.

[0042] In one possible design, generating the bias signal includes: smoothing and filtering a switching signal of a power amplifier to generate the bias signal.

[0043] In one possible design, the method further includes generating a switching signal for the power amplifier.

[0044] In one possible design, generating the bias signal includes: performing smoothing filtering on the TDD timing signal to generate the bias signal.

[0045] In one possible design, the method further includes generating a TDD timing signal.

[0046] In one possible design, the wireless communication device is applied to an ET system; generating a bias signal includes: smoothing and filtering an envelope signal of the ET system to generate the bias signal.

[0047] In one possible design, the method further includes: generating an envelope signal.

[0048] In a fourth aspect, a signal processing method is provided, which is applied to a wireless communication device, wherein the wireless communication device includes a power amplifier; the method includes: generating a bias signal based on a target signal; the target signal includes a switching signal of the power amplifier or a TDD timing signal or an envelope signal of the ET system; then, enabling the power amplifier and amplifying the input signal of the power amplifier based on the bias signal and the power supply signal.

[0049] In one possible design, the method further includes: generating a target signal.

[0050] Based on any of the methods provided in the third or fourth aspects above, several optional implementations are provided below:

[0051] Optionally, the wireless communication device includes multiple power amplifiers, and at least two power amplifiers among the multiple power amplifiers share a bias signal.

[0052] Optionally, the multiple power amplifiers belong to different radio frequency transmission channels, respectively, and the different radio frequency transmission channels are used for MIMO communication.

[0053] In a sixth aspect, a signal processing method is provided for use in a wireless communication device including a first power amplifier. The method includes generating a bias signal for compensating for a characteristic of the first power amplifier that varies with an input signal in a TDD scenario. The method also includes enabling the first power amplifier and amplifying the input signal of the first power amplifier based on the bias signal and a power supply signal.

[0054] In one possible design, generating a bias signal includes generating the bias signal based on a switching signal of a power amplifier.

[0055] In one possible design, generating a bias signal based on a TDD timing signal includes: generating a switching signal of a power amplifier; shaping the switching signal of the power amplifier; and performing digital-to-analog conversion on the shaped signal to obtain a bias signal.

[0056] In one possible design, a bias signal is generated based on a switching signal of a power amplifier, including: generating a switching signal of the power amplifier; performing digital-to-analog conversion on the switching signal of the power amplifier to obtain an analog signal of the switching signal of the power amplifier; and shaping the analog signal of the switching signal of the power amplifier to obtain a bias signal.

[0057] In one possible design, generating a bias signal includes generating the bias signal based on a TDD timing signal.

[0058] In one possible design, generating a bias signal based on a TDD timing signal includes: generating a TDD timing signal; shaping the TDD timing signal; and performing digital-to-analog conversion on the shaped signal to obtain a bias signal.

[0059] In one possible design, generating a bias signal based on a TDD timing signal includes: generating a TDD timing signal; performing digital-to-analog conversion on the TDD timing signal to obtain an analog signal of the TDD timing signal; and shaping the analog signal of the TDD timing signal to obtain a bias signal.

[0060] In one possible design, the wireless communication device is applied to an ET system. In this case, generating a bias signal includes: generating the bias signal based on an envelope signal of the ET system.

[0061] In one possible design, generating a bias signal based on an envelope signal of the ET system includes: generating an envelope signal; shaping the envelope signal; and performing digital-to-analog conversion on the shaped envelope signal to obtain a bias signal.

[0062] In one possible design, generating a bias signal based on an envelope signal of the ET system includes: generating an envelope signal; performing digital-to-analog conversion on the envelope signal to obtain an analog signal of the envelope signal; and shaping the analog signal to obtain a bias signal.

[0063] In one possible design, the method further includes: adjusting the parameters of the wireless communication device to generate a pre-bias signal. The bias signal is a pre-bias signal that satisfies the requirement of compensating for the characteristic of the first power amplifier that changes with the input signal in a TDD scenario. The pre-bias signal is used to adjust the relationship between the output signal and the input signal of the first power amplifier. Then, based on the output signal and the input signal of the first power amplifier, training is performed to obtain the model coefficients used in the pre-distortion processing. The model coefficients make the characteristics of the pre-distortion processing satisfy the inverse function of the characteristic that the output signal of the first power amplifier changes with the input signal in the TDD scenario. In this case, generating the bias signal includes: generating the bias signal based on the target parameters; wherein the target parameters are the parameters of the wireless communication device when obtaining the model coefficients. Pre-distortion processing is performed on the first signal to be processed, including: pre-processing the first signal to be processed based on the model coefficients.

[0064] In one possible design, training based on the output signal and input signal of the first power amplifier to obtain model coefficients used in predistortion processing includes training based on the output signal and input signal of the first power amplifier and a model extraction algorithm to obtain model coefficients used in predistortion processing. Exemplarily, the model extraction algorithm includes a least squares method or a minimum mean square error algorithm.

[0065] In one possible design, a wireless communication device includes a first transmission channel and a second transmission channel; the first transmission channel includes a first power amplifier; and the second transmission channel includes a second power amplifier. In this case, the method further includes: performing predistortion processing on the second signal to be processed to obtain a second signal to compensate for the distortion characteristics of the second power amplifier. Then, using the second power amplifier, the input signal of the second power amplifier is amplified based on a bias signal. The input signal of the second power amplifier is generated based on the second signal. In this case, the bias signal is also used to compensate for the characteristics of the second power amplifier that vary with changes in the input signal in a TDD scenario.

[0066] The devices in the wireless communication device involved in any wireless communication core device or method provided in any aspect provided above are integrated into one chip, or different devices in the wireless communication device are integrated into different chips.

[0067] Optionally, the wireless communication device is integrated into a radio frequency front-end device (RFFE).

[0068] Optionally, the wireless communication device is integrated into a radio frequency integrated circuit (RFIC).

[0069] Optionally, the wireless communication device is applied to the ET system, and the wireless communication device is integrated into the ET chip.

[0070] In a seventh aspect, a wireless communication system is provided, including a base station and a terminal, wherein the base station or the terminal includes any one of the wireless communication devices provided in the first to third aspects above.

[0071] In an eighth aspect, a wireless communication device is provided, which includes: a memory, and one or more processors; the memory is used to store computer instructions, and the processor is used to call the computer instructions to execute any one of the signal processing methods provided in aspects 4 to 6.

[0072] In a ninth aspect, a computer-readable storage medium, such as a non-transitory computer-readable storage medium, is provided. A computer program (or instruction) is stored thereon, and when the computer program (or instruction) is executed on a computer (such as a wireless communication device), the computer is caused to perform any one of the methods provided in aspects 4 to 6 above.

[0073] In a tenth aspect, a computer program product is provided, which, when executed on a computer, enables any one of the methods provided in aspects 4 to 6 to be executed.

[0074] It can be understood that any of the methods, systems, computer-readable storage media, and computer program products provided above can be applied to the wireless communication device provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding wireless communication device and will not be repeated here.

[0075] In this application, the names of the above-mentioned devices or functional modules do not limit the devices or functional modules themselves. In actual implementation, these devices or functional modules may appear with other names. As long as the functions of each device or functional module are similar to those of this application, they fall within the scope of the claims of this application and their equivalents.

[0076] These and other aspects of the present application will become more readily apparent from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 A schematic diagram of the structure of a wireless communication system provided in an embodiment of the present application;

[0078] Figure 2 A schematic structural diagram of a wireless communication device provided in an embodiment of the present application;

[0079] Figure 3 A schematic diagram illustrating the ideal conversion performance and actual conversion performance between the power of an input signal and the power of an output signal of a PA provided in an embodiment of the present application;

[0080] Figure 4 A schematic structural diagram of another wireless communication device provided in an embodiment of the present application;

[0081] Figure 5 A schematic diagram of a PA provided in an embodiment of the present application;

[0082] Figure 6 A schematic diagram showing the connection relationship between a DPD and a PA, and the gain of the DPD, PA, and their combination, provided in an embodiment of the present application;

[0083] Figure 7A A waveform diagram of an input signal of a PA in a TDD scenario provided in an embodiment of the present application;

[0084] Figure 7B A schematic diagram illustrating the relationship between a PA input signal and a PA switching signal in a TDD scenario provided in an embodiment of the present application;

[0085] Figure 7C A schematic diagram illustrating the relationship between the input signal, switching signal, and bias signal of a PA in a TDD scenario provided in an embodiment of the present application;

[0086] Figure 8A structural diagram of a DPD system in a non-ET system provided in an embodiment of the present application;

[0087] Figure 9 A schematic diagram of the structure of a DPD system under an ET system provided in an embodiment of the present application;

[0088] Figure 10A Schematic diagram of the structure of the wireless communication device provided in the embodiment of the present application Figure 1 ;

[0089] Figure 10B A schematic diagram illustrating synchronization of a timing characteristic of a PA bias signal and a timing characteristic of a PA switch signal provided in an embodiment of the present application;

[0090] Figure 10C A schematic diagram illustrating how a bias signal affects the transmission characteristics of a PA is provided in an embodiment of the present application;

[0091] Figure 11A Schematic diagram of the structure of the wireless communication device provided in the embodiment of the present application Figure 2 ;

[0092] Figure 11B Schematic diagram of the structure of the wireless communication device provided in the embodiment of the present application Figure 3 ;

[0093] Figure 12A Schematic diagram of the structure of the wireless communication device provided in the embodiment of the present application Figure 4 ;

[0094] Figure 12B Schematic diagram of the structure of the wireless communication device provided in the embodiment of the present application Figure 5 ;

[0095] Figure 13A Schematic diagram of the structure of the wireless communication device provided in the embodiment of the present application Figure 6 ;

[0096] Figure 13B Schematic diagram 7 of the structure of the wireless communication device provided in an embodiment of the present application;

[0097] Figure 14 A schematic diagram of the structure of a wireless communication device for MIMO scenarios provided in an embodiment of the present application Figure 1 ;

[0098] Figure 15 A schematic diagram of the structure of a wireless communication device for MIMO scenarios provided in an embodiment of the present application Figure 2 ;

[0099] Figure 16 A schematic diagram of the structure of a wireless communication device for MIMO scenarios provided in an embodiment of the present application Figure 3 ;

[0100] Figure 17 Schematic diagram of the signal processing method provided in this embodiment of the application Figure 1 ;

[0101] Figure 18 Schematic diagram of the signal processing method provided in this embodiment of the application Figure 2 ;

[0102] Figure 19 Schematic diagram of the signal processing method provided in this embodiment of the application Figure 3 . DETAILED DESCRIPTION

[0103] The technical solutions provided in the embodiments of the present application are mainly applicable to wireless communication systems. The wireless communication systems may comply with the wireless communication standards of the Third Generation Partnership Project (3GPP), or may comply with other wireless communication standards, such as the 802 series (such as 802.11, 802.15, or 802.20) of the Institute of Electrical and Electronics Engineers (IEEE).

[0104] It should be understood that in wireless communication systems, 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 those devices that make up the wireless communication network, which can be simply referred to as network equipment or network elements. Network equipment usually belongs to operators (such as China Mobile and Vodafone) or infrastructure providers (such as tower companies). Network equipment can be further divided into radio access network (RAN) equipment and core network (CN) equipment. Typical RAN equipment includes base stations (BS).

[0105] It should be understood that a base station may sometimes also be referred to as an access point (AP) or a transmission reception point (TRP). Specifically, a base station may be a generation Node B (gNB) in a 5G new radio (NR) system or an evolutionary Node B (eNB) in a 4G long term evolution (LTE) system. Depending on the physical form or transmit power of the base station, the base station may be divided into a macro base station or a micro base station. A micro base station is sometimes also referred to as a small base station or a small cell.

[0106] Devices that use wireless network services are usually located at the edge of the network and can be referred to as terminals. Terminals can establish connections with network devices and provide wireless communication services to users based on the services of network devices. It should be understood that due to the closer relationship between terminals and users, terminals are sometimes also referred to as user equipment (UE) or subscriber units (SU). In addition, compared to base stations that are usually placed in fixed locations, terminals often move with users and are sometimes also referred to as mobile stations (MS). In addition, some network devices, such as relay nodes (RN) or wireless routers, are sometimes also considered terminals because they have UE identities or belong to users.

[0107] Specifically, the terminal can be a mobile phone, a tablet computer, a laptop computer, a wearable device (such as a smart watch, a smart bracelet, a smart helmet, and 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 appliances) and smart city devices (such as security or monitoring equipment, and smart road traffic facilities).

[0108] For ease of description, this application uses base stations and terminals as examples for illustration. Figure 1 A schematic structural diagram of a wireless communication system provided in an embodiment of the present application. Figure 1 The wireless communication system shown includes a base station 01 and a terminal 02 .

[0109] In this wireless communication system, a base station 01 can provide communication coverage for a specific geographical area through integrated or external antenna equipment. One or more terminals 02 located within the communication coverage area of ​​the base station 01 can access the base station 01.

[0110] In this wireless communication system, terminal 02 and base station 01 must be aware of the predefined configurations of the wireless communication system, including the radio access technologies (RATs) supported by the system and the system-defined radio resource configurations, such as the basic configurations of radio frequency bands and carriers. These predefined configurations can be part of the standard protocols of the wireless communication system or determined through interaction between terminal 02 and base station 01. The content of the relevant standard protocols may be pre-stored in the memory of terminal 02 and base station 01, or embodied in the hardware circuits or software code of terminal 02 and base station 01.

[0111] In this wireless communication system, terminal 02 and base station 01 support one or more of the same RATs, such as 5G NR, 4G LTE, or a RAT of a future evolution system. Specifically, terminal 02 and base station 01 use the same air interface parameters, coding scheme, and modulation scheme, and communicate with each other based on system-defined radio resources.

[0112] Figure 2 This is a structural diagram of a wireless communication device 20 provided in an embodiment of the present application. The wireless communication device 20 may be the above-mentioned terminal 02 or base station 01. Figure 2 As shown, the wireless communication device 20 may include multiple components, such as an application subsystem 201, a memory 202, a massive storage 203, a baseband subsystem 204, a radio frequency integrated circuit (RFIC) 205, a radio frequency front end (RFFE) device 206, and an antenna (ANT) 207. These components may be coupled via various interconnection buses or other electrical connection methods.

[0113] Figure 2 In the figure, ANT_1 represents the first antenna, ANT_N represents the Nth antenna, and N is an integer greater than 1. Tx represents the transmit path, and Rx represents the receive path. Different numbers represent different paths. Each path can represent a signal processing channel. Among them, FBRx represents the feedback receive path, PRx represents the main receive path, and DRx represents the diversity receive path. HB represents high frequency, and LB represents low frequency. The two refer to the relative high and low frequencies. BB represents baseband. It should be understood that Figure 2The symbols and components are for illustrative purposes only and are only one possible implementation. The present invention also includes other implementations. For example, the wireless communication device 20 may include more or fewer paths and more or fewer components.

[0114] The application subsystem 201 serves as the main control system or main computing system of the wireless communication device 20, running the main operating system and application programs, managing the software and hardware resources of the entire wireless communication device 20, and providing a user interface. The application subsystem 201 may also include driver software related to other subsystems (such as the baseband subsystem 204).

[0115] The application subsystem 201 may include one or more processors. The multiple processors may be multiple processors of the same type, or may include a combination of multiple types of processors. In the present application, the processor may be a general-purpose processor or a processor designed for a specific field. For example, the processor may be a central processing unit (CPU), a digital signal processor (DSP), or a microcontroller (MCU). The processor may also be a graphics processing unit (GPU), an image signal processor (ISP), an audio signal processor (ASP), and an AI processor specially designed for artificial intelligence (AI) applications. AI processors include but are not limited to neural network processing units (NPUs), tensor processing units (TPUs), and processors referred to as AI engines.

[0116] Figure 2In the figure, the RF integrated circuit 205 (including RFIC 1, and one or more optional RFIC 2) and the RF front-end device 206 can together constitute the RF subsystem. According to the different receiving or transmitting paths of the signal, the RF subsystem can also be divided into an RF receive path and an RF transmit path. Among them, the RF receive channel can receive the RF signal through the antenna, process the RF signal (such as amplification, filtering and down-conversion) to obtain a baseband signal, and pass it to the baseband subsystem 204. The RF transmit channel can receive the baseband signal from the baseband subsystem 204, process the baseband signal (such as up-conversion, amplification and filtering) to obtain an RF signal, and finally radiate the RF signal into space through the antenna. The RF integrated circuit 205 can be called an RF processing chip or an RF chip.

[0117] Specifically, the RF subsystem may include electronic devices such as an antenna switch, an antenna tuner, a low noise amplifier (LNA), a power amplifier (PA), a mixer, a local oscillator (LO), and a filter. These electronic devices can be integrated into one or more chips as needed.

[0118] The RF front-end device 206 can also be an independent chip. RF chips are sometimes also called receivers, transmitters or transceivers. With the evolution of technology, antennas can sometimes be considered as part of the RF subsystem and can be integrated into the chip of the RF subsystem. The antenna, RF front-end device 206 and RF chip can all be manufactured and sold separately. Of course, the RF subsystem can also use different devices or different integration methods based on power consumption and performance requirements. For example, some devices belonging to the RF front end are integrated into the RF chip, or even the antenna and the RF front-end device 206 are integrated into the RF chip. The RF chip can also be called an RF antenna module or antenna module.

[0119] Similar to the RF subsystem's primary function of processing RF signals, the baseband subsystem 204, as its name implies, primarily processes baseband signals. The baseband subsystem 204 can extract useful information or data bits from baseband signals, or convert them into baseband signals to be transmitted. These information or data bits can represent user data such as voice, text, and video, or control information. For example, the baseband subsystem 204 can perform signal processing operations such as modulation and demodulation, encoding, and decoding. Baseband signal processing operations vary across different wireless access technologies, such as 5G NR and 4G LTE.

[0120] Furthermore, since radio frequency signals are typically analog signals and the signals processed by the baseband subsystem 204 are primarily digital signals, the wireless communication device 20 also requires an analog-to-digital converter. In the embodiments of the present application, the analog-to-digital converter can be located in either the baseband subsystem 204 or the radio frequency subsystem. The analog-to-digital converter includes an analog-to-digital converter (ADC) that converts analog signals into digital signals, and a digital-to-analog converter (DAC) that converts digital signals into analog signals.

[0121] Similar to the application subsystem 201, the baseband subsystem 204 may also include one or more processors. In addition, the baseband subsystem 204 may also include one or more hardware accelerators (HACs). Hardware accelerators can be used to specifically complete some sub-functions with high processing overhead, such as data packet assembly and parsing, data packet encryption and decryption, etc. These sub-functions can also be implemented using general-purpose processors, but due to performance or cost considerations, the use of hardware accelerators may be more appropriate. In a specific implementation, the hardware accelerator is mainly implemented using an application-specific integrated circuit (ASIC). Of course, the hardware accelerator may also include one or more relatively simple processors, such as an MCU.

[0122] In the embodiment of the present application, the baseband subsystem 204 and the radio frequency subsystem together constitute the communication subsystem, which provides wireless communication functions for the wireless communication device 20. Generally, the baseband subsystem 204 is responsible for managing the software and hardware resources of the communication subsystem and can configure the operating parameters of the radio frequency subsystem. The processor of the baseband subsystem 204 can run a sub-operating system of the communication subsystem, which is often an embedded operating system or a real-time operating system (RTOS), such as the VxWorks operating system or Qualcomm's QuRT system.

[0123] The baseband subsystem 204 can be integrated into one or more chips, which can be referred to as a baseband processing chip or baseband chip. The baseband subsystem 204 can be a standalone chip, which can be referred to as a modem or modem chip. The baseband subsystem 204 can be manufactured and sold as a modem chip. A modem chip is sometimes also referred to as a baseband processor or mobile processor. In addition, the baseband subsystem 204 can be further integrated into a larger chip, which can be manufactured and sold as a larger chip. This larger chip can be referred to as a system-on-chip, a system-on-chip, or a system-on-a-chip (SoC), or simply an SoC chip. The software components of the baseband subsystem 204 can be built into the chip's hardware components before the chip leaves the factory, or can be imported from other non-volatile memory into the chip's hardware components after the chip leaves the factory, or these software components can be downloaded and updated online via a network.

[0124] In addition, the wireless communication device 20 also includes a memory, such as Figure 2 The memory 202 and the large-capacity memory 203 in the application subsystem and the baseband subsystem 204 may also include one or more caches respectively. In a specific implementation, the memory can be divided into volatile memory (volatile memory) and non-volatile memory (non-volatile memory, NVM). Volatile memory refers to a memory in which the data stored inside will be lost when the power supply is interrupted. At present, 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). Non-volatile memory refers to a memory in which the data stored inside will not be lost even if the power supply is interrupted. Common non-volatile memories include read-only memory (read-only memory, ROM), optical disks, magnetic disks, and various memories based on flash memory technology. Generally speaking, volatile memory can be used for the memory 202 and cache, and non-volatile memory, such as flash memory, can be used for the large-capacity memory 203.

[0125] The following describes the related technologies involved in the embodiments of this application:

[0126] 1) PA

[0127] Figure 3The figure shows the ideal conversion performance (i.e. linear characteristics) and actual conversion performance (i.e. nonlinear characteristics) between the power of the input signal and the power of the output signal of the PA. in1 When the actual power of the output signal is the same as the ideal power, both are P out1 When the power of the input signal is P in2 When the actual power of the output signal P out2 ' is less than the ideal power P out2 .

[0128] Figure 4 The structure diagram of a wireless communication device 30 provided in an embodiment of the present application is shown to illustrate the position of the PA in the wireless communication device. Figure 4 In the figure, the wireless communication device 30 includes a digital baseband chip 301, a DAC 302, a first low pass filter (LPF) 303, a PA 304, a band pass filter (BPF) 305, a second LPF 306, an ADC 307, an LO 308 and an antenna 309.

[0129] Among them, the digital baseband chip 301 can be equivalent to Figure 2 The baseband subsystem 204 in the other devices can be used as Figure 2 The connection relationship between these devices and the signal flow in these devices can be referred to Figure 4 The functions of these devices can be referred to the description above or the prior art, and will not be repeated here. Figure 4 The structure of the wireless communication device 30 shown is only an example and does not limit the structure of the wireless communication device 30 to which the embodiments of the present application are applicable.

[0130] It should be understood that Figure 4 The PA304 includes a signal input port 41 and a signal output port 42. In addition, the PA304 also includes a power supply port 43 and a bias port 44. Figure 5 FIG3 shows a schematic diagram of a PA 304. The PA 304 is configured to receive a power signal from a power supply port 43, a bias signal from a bias port 44, and a radio frequency signal from a signal input port 41, and output the amplified radio frequency signal through a signal output port 42.

[0131] In some descriptions of the embodiments of this application, the RF signal received by the PA's signal input port may also be referred to as the PA's input signal; and the power-amplified RF signal output by the PA's signal output port may also be referred to as the PA's output signal. This description is unified here and will not be repeated below.

[0132] 2) DPD

[0133] In order to combat the nonlinear characteristics of PA, the industry has introduced DPD technology. For the basic principles of DPD technology, please refer to the background technology and will not be repeated here.

[0134] Figure 6 The diagram illustrates the connection between the DPD and PA, as well as the gain diagram of the DPD, PA, and their combination. The gain diagram represents the relationship between the power of the processed signal and the gain (i.e., the ratio of the output signal power to the processed signal power). The processed signal is the DPD input signal, and the output signal is the PA output signal.

[0135] Since the DPD processes digital signals and the PA processes analog signals, a DAC and an ADC are usually connected between the DPD and the PA. In addition, some filters can also be connected between the DPD and the PA. In an example, see Figure 4 , DPD can be located in the digital baseband chip 301. Figure 4 It can be seen that a DAC and a first LPF are connected between the DPD and the PA.

[0136] It should be noted that Figure 6 The connection relationship between DPD and PA described in the figure is only for schematic description, that is, the signal first passes through DPD and then passes through PA before being sent. Figure 6 and Figure 4 The description of the connection relationship between DPD and PA is not contradictory.

[0137] It should be noted that, for the sake of completeness of description, the output signal of the PA is schematically illustrated in the wireless communication device provided in this application, which is uniformly illustrated here and will not be repeated in the following.

[0138] 3) TDD scenario

[0139] In the TDD scenario, the waveform of the PA input signal is as follows: Figure 7A shown. Figure 7A The horizontal axis represents time, denoted as t, and the vertical axis represents the signal voltage (or power). Such an input signal can cause the PA to fluctuate between high and low. In this case, the PA's nonlinear characteristics often change with changes in the input signal and operating environment. For example, when the PA switches from a non-transmitting signal to a transmitting signal, the PA switches from an off state to an on state, causing its internal temperature to fluctuate dramatically from low to high. This change prevents the PA's gain from stabilizing for an extended period of time.

[0140] Because PA switching is very frequent in TDD scenarios, the PA's nonlinear characteristics are constantly changing. This behavior differs significantly from the PA characteristics used during offline DPD system training. This dynamic gain change, known in academia as long-term memory effects, significantly degrades DPD system performance and can even lead to negative linearity gains. This presents a significant challenge for both base stations and terminals.

[0141] In the TDD scenario, the waveform of the PA switching signal is a square wave. The PA input signal is determined based on the PA switching signal. The relationship between the PA input signal and the PA switching signal is as follows: Figure 7B As shown. Among them, Figure 7B is based on Figure 7A To be drawn. Figure 7B The horizontal axis is the time axis, represented by t, and the vertical axis represents the voltage value (or power value) of the signal. Figure 7B The square wave signal shown by the thick line in the middle represents the switching signal of the PA.

[0142] 4) Bias signal

[0143] In current technology, in a TDD scenario, the voltage of the bias signal is usually a constant value.

[0144] In the embodiment of the present application, in the TDD scenario, the bias signal is based on the input signal of the PA (eg Figure 7A The bias signal is determined by the signal shown in FIG. 1 , which is used to compensate (or offset) the characteristic of the PA changing with the input signal in the TDD scenario. Since there is a similar Figure 7B Based on the relationship shown, it can be considered that in the embodiment of the present application, in a TDD scenario, the bias signal is determined based on the PA's switching signal. The bias signal is used to compensate (or offset) the characteristic of the PA in a TDD scenario that varies with the input signal, which is equivalent to: the bias signal is used to compensate for the nonlinear changes of the PA.

[0145] As an example, since in the embodiment of the present application, the bias signal is determined based on the input signal or switching signal of the PA, in the embodiment of the present application, the bias signal can be called a "dynamic bias signal".

[0146] As an example, the characteristic of a PA that changes with changes in an input signal in a TDD scenario, or the nonlinear change of a PA in a TDD scenario, can be referred to as a self-bias effect of the PA.

[0147] like Figure 7C, which is a schematic diagram of the relationship between an input signal and a bias signal of a PA provided in an embodiment of the present application. Figure 7C The horizontal axis represents the time axis, and the vertical axis represents the voltage value (or power value) of the signal. Figure 7C is based on Figure 7B To be drawn. Figure 7C The dotted line in represents a bias signal of a PA provided in an embodiment of the present application.

[0148] Figure 7C The bias signal shown by the dotted line is only an example, and Figure 7C The waveform of a bias signal applicable to the embodiment of the present application is merely schematically described, and does not limit the actual waveform of the bias signal applicable to the embodiment of the present application.

[0149] The embodiments of the present application provide the basic idea of ​​"compensating for the nonlinear changes of the PA in the TDD scenario based on the bias signal of the PA, or compensating for the characteristics of the PA that change with the input signal in the TDD scenario based on the bias signal of the PA", without being limited to how to obtain the actual waveform of the bias signal. Optionally, the actual waveform of the bias signal of the PA can be obtained by multiple debugging based on the characteristics of the PA itself (such as hardware characteristics) during the design phase. For details, please refer to Figure 11B The embodiment shown.

[0150] 5) Non-ET system and ET system

[0151] In non-ET systems, the voltage of the power signal input to the power supply port of the PA is constant, such as Figure 8 Figure 2 shows a schematic diagram of the structure of the DPD system in a non-ET system. Figure 8 The voltage of the power supply signal is a constant value.

[0152] In the ET system, the power signal input to the power supply port of the PA is generated based on the envelope signal generated by the envelope processor. Specifically, the envelope signal is converted from digital to analog by the DAC, and then the analog signal obtained after the digital-to-analog conversion is modulated by the ET modulator to obtain the power signal. Figure 9 Figure 2 shows the structural diagram of the DPD system under the ET system.

[0153] As an example, the envelope processor may be located in the baseband subsystem.

[0154] 6) Other terms

[0155] The terms "first" and "second" in the description and drawings of this application are used to distinguish different objects, or to distinguish different treatments of the same object, rather than to describe a specific order of objects. In addition, the terms "including" and "having" and any variations thereof mentioned in the description of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include other steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices. In the embodiments of the present application, "multiple" includes two or more. In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete way.

[0156] The port names of the devices described in the embodiments of the present application are only examples and may be called by other names in specific implementations. For example, the bias port of a PA may also be called an interface circuit.

[0157] In view of the problem that "in TDD scenarios, the DPD system has low performance and even causes negative linearity gain in the DPD system" in the current technology, the embodiment of the present application provides a wireless communication device. The wireless communication device can be Figure 2 Alternatively, the wireless communication device may be a communication subsystem (including a baseband subsystem 204, a radio frequency integrated circuit 205, and a radio frequency front-end device 206) in the wireless communication device 20. As described above, the communication subsystem may be implemented by one or more chips.

[0158] The basic idea of ​​the technical solution provided by the embodiments of this application is to compensate (or offset) the characteristic changes of the PA in the TDD scenario by using the DPD bias signal, thereby helping to stabilize the characteristics of the PA in the TDD scenario and further helping to improve the linearization performance of the DPD system. In some embodiments, the DPD bias signal is obtained by processing existing signals in the wireless communication device (such as TDD timing signals or envelope signals of the ET system). This helps to save hardware resource overhead and reduce the implementation complexity and cost of signal processing.

[0159] Hereinafter, the wireless communication device 4 provided in the embodiment of the present application will be described with reference to the accompanying drawings.

[0160] like Figure 10A, which is a structural diagram of a wireless communication device 4 provided in an embodiment of the present application. Figure 10A The wireless communication device 4 shown includes a first PA 41 and a bias circuit 42 .

[0161] The first PA41 includes a power supply port 410, a bias port 411, a signal input port 412 and a signal output port 413. The first PA41 is used to receive a power signal from the power supply port 410, receive a bias signal from the bias port 411, receive a radio frequency signal from the signal input port 412, and output the power-amplified radio frequency signal through the signal output port 413.

[0162] The bias circuit 42 is connected to the bias port 411 and is used to generate the bias signal, wherein the timing characteristics of the bias signal are synchronized with the timing characteristics of the switching signal of the first PA 41 to compensate for the nonlinear change of the first PA 41 .

[0163] The switching signal of the first PA 41 is used to control the switching timing of the first PA 41 in the TDD scenario. The switching signal of the first PA 41 is a square wave signal. As an example, the bias signal can be considered as a smoothed signal obtained by fitting the square wave signal.

[0164] The timing characteristics of the switching signal may include: the changing trend of the switching signal over time. Optionally, the timing characteristics of the switching signal may also include the time point when the change starts. The changing trend of the switching signal over time includes: a rising phase, a steady-state phase, a falling phase, and a shut-off phase. Among them, the rising phase refers to the phase from a low level to a high level. The steady-state phase refers to the phase of a continuous high level. The falling phase refers to the phase from a high level to a low level. The shut-off phase refers to the phase of a continuous low level. Optionally, the changing trend of the switching signal over time is: a periodic change according to the "rising phase, steady-state phase, falling phase, and shut-off phase."

[0165] Optionally, the timing characteristics of the bias signal of the first PA41 are synchronized with the timing characteristics of the switching signal of the first PA41, including: the bias signal of the first PA41 and the switching signal of the first PA41 have the same changing trend. Based on the above description, it can be seen that the changing trend of the bias signal over time includes a rising phase, a steady-state phase, a falling phase, and a shutdown phase. Optionally, the changing trend of the bias signal over time is: a periodic change according to the "rising phase, steady-state phase, falling phase, and shutdown phase."

[0166] Further optionally, the timing characteristics of the bias signal of the first PA41 are synchronized with the timing characteristics of the switching signal of the first PA41, and may also include: the starting time point of the rising phase of the bias signal of the first PA41 is the same as the starting time point of the rising phase of the switching signal of the first PA41, or the difference between the starting time point of the rising phase of the bias signal and the starting time point of the rising phase of the switching signal of the first PA41 is within a first preset range.

[0167] Further, optionally, the timing characteristics of the bias signal of the first PA41 are synchronized with the timing characteristics of the switching signal of the first PA41, and may further include: the starting time point of the falling phase of the bias signal is the same as the starting time point of the falling phase of the switching signal of the first PA41, or the difference between the starting time point of the falling phase of the bias signal and the starting time point of the falling phase of the switching signal of the first PA41 is within a second preset range. The first preset range and the second preset range may be the same or different.

[0168] like Figure 10B , which is a schematic diagram of synchronization of a timing characteristic of a bias signal of a PA and a timing characteristic of a switching signal of the PA provided by an embodiment of the present application.

[0169] It should be noted that for a switching signal, the rising phase is specifically the stage where the signal transitions from a low level to a high level, and the falling phase is specifically the stage where the signal transitions from a high level to a low level. For a bias signal, the rising phase is specifically the stage where the signal smoothly rises from a low level to a high level, which can be called the "ramp-up phase," and the falling phase is specifically the stage where the signal smoothly drops from a high level to a low level.

[0170] It should also be noted that the timing characteristics of the bias signal are synchronized with the timing characteristics of the switching signal. In actual implementation, the "synchronization" here can be replaced by coincidence, matching or equivalence.

[0171] The technical solution provided by the embodiment of the present application is that, in the TDD scenario, the timing characteristics of the PA bias signal are synchronized with the timing characteristics of the PA switching signal. Since the switching signal input signal of the PA in the TDD scenario has the characteristics of sometimes high and sometimes low, the bias signal of the PA has the characteristics of sometimes high and sometimes low. In other words, the voltage of the bias signal of the PA is not a constant value. Therefore, compared with the prior art, the technical solution provided by the embodiment of the present application changes the waveform of the bias signal. Furthermore, since the bias signal affects the transmission characteristics of the PA, changing the voltage value of the bias signal helps to change the transmission characteristics of the PA, thereby helping to stabilize the characteristics of the PA in the TDD scenario (i.e., the degree of nonlinear change is reduced, i.e., the degree of change with the change of the input signal of the PA is reduced), thereby helping to improve the linearization performance of the DPD system (including DPD and PA).

[0172] like Figure 10C FIG. 1 is a schematic diagram of an embodiment of the present application for illustrating how a bias signal affects the transmission characteristics of a PA. Figure 10C is based on Figure 10B The bias signal shown in FIG is plotted. Figure 10C The horizontal axis in each figure represents the voltage value of the PA input signal, and the vertical axis represents the voltage value of the PA output signal. Figure 10C The following figure a and b are used to illustrate:

[0173] Figure a shows the signal transmission characteristics of the PA in the steady-state phase (as shown by the solid line in Figure a) and the signal transmission characteristics in the ramp-up phase (as shown by the dotted line in Figure a) in the TDD scenario when the voltage of the bias signal is a constant value of 2.4V.

[0174] Figure b shows that when the voltage of the bias signal is not constant (such as Figure 10B The bias signal shown in (b) is expressed as 2.4 + d(n) in Figure b to illustrate that the voltage value of the bias signal changes with time). At this time, the signal transmission characteristics of the PA in the steady-state phase in the TDD scenario (as shown by the solid line in Figure b) and the signal transmission characteristics in the ramp-up phase (as shown by the dotted line in Figure b) are shown.

[0175] Comparing Figures a and b, we can see that using the bias signal provided in the embodiments of the present application helps change the PA's transmission characteristics. Furthermore, compared to Figure a, the signal transmission characteristics during the ramp-up phase in Figure b are closer to those during the steady-state phase. Therefore, power amplification by the PA using the bias signal provided in the embodiments of the present application helps stabilize the PA's characteristics in TDD scenarios, thereby improving the linearization performance of the DPD system.

[0176] The following describes a specific implementation of the wireless communication device. Before that, it should be noted that for the sake of simplicity of the drawings, some drawings in this application, such as Figure 11A 、 Figure 11B 、 Figure 12A In the accompanying drawings, the power supply port is not shown. However, in actual implementation, the PA has a power supply port.

[0177] Optional, such as Figure 11A As shown, the wireless communication device 4 may further include a first DPD 43. The first DPD 43 is configured to perform pre-distortion processing on the first signal to be processed to obtain a first signal to compensate for the distortion characteristics of the first PA 41. The input signal of the first PA 41 is generated based on the first signal.

[0178] Ideally, the first signal to be processed can ensure linear gain after being pre-distorted by the first DPD43 and amplified by the first PA41. Figure 4 It can be seen that devices such as DAC and filter (such as LPF) can also be set between the first DPD43 and the first PA41. For the sake of simplicity in description, in the embodiment of the present application, the devices between the DPD and PA are collectively referred to as intermediate devices.

[0179] Figure 11A The bias signal in the described embodiment is a bias signal that can compensate for the characteristic of the first PA 41 that changes with the input signal in a TDD scenario, such as Figure 11B As shown, a wireless communication device 4 is provided. Figure 11A On the basis of the above, a training module 40 is added to obtain the parameters of the bias circuit 42 when generating the bias signal (specifically, the parameters of the analog shaping unit or the digital shaping unit described below), and the model coefficients used by the first DPD43 when generating the bias signal.

[0180] like Figure 11B As shown, the signal input port of the training unit 40 is connected to the signal input port 412 and the signal output port of the first PA 41, and the signal output port of the training unit 40 is connected to the first DPD 43. Based on this:

[0181] The bias circuit 42 is further configured to adjust the parameters of the bias circuit 42 to generate a pre-bias signal. The bias signal is a pre-bias signal sufficient to compensate for the characteristics of the first PA 41 that vary with input signals in TDD scenarios. The pre-bias signal is used to adjust the relationship between the output signal and the input signal of the first PA 41. In other words, the pre-bias signal is the signal generated by the bias circuit 42 during training (or, the pre-bias signal is the bias signal during training). During training by the training unit 40, the pre-bias signal may not satisfy the requirement of "compensating for the characteristics of the first PA 41 that vary with input signals in TDD scenarios."

[0182] The training unit 40 is used to perform training based on the output signal and input signal of the first PA41 to obtain the model coefficient of the first DPD. The model coefficient makes the characteristics of the first DPD43 satisfy the inverse function of the characteristic that the output signal of the first PA41 changes with the input signal in the TDD scenario. Optionally, the training unit is specifically used to perform training based on the output signal and input signal of the first PA41 and a model extraction algorithm to obtain the model coefficient of the first DPD43. For example, the model extraction algorithm includes: least square (LS) or least mean square error (LMS) algorithm. As an example, the training unit 40 can be located in the digital baseband chip 301.

[0183] based on Figure 11B The first DPD is specifically configured to perform predistortion processing on the first signal to be processed based on the above-mentioned model coefficients. The bias circuit 42 is specifically configured to generate a bias signal based on a target parameter; wherein the target parameter is a parameter of the bias circuit when the training unit obtains the model coefficients.

[0184] exist Figure 11B In the wireless communication device 4 shown, the signal transmission characteristics of the first PA41 are changed by continuously adjusting the parameters of the bias circuit 42. The training unit 40 is connected to the signal input port and the signal output port of the first PA41 to track the changes in the signal transmission characteristics of the first PA41 caused by adjusting the parameters of the bias circuit 42; then, the training unit 40 obtains the model coefficient of the first DPD43 through training based on the changes and the predefined model extraction algorithm. The model coefficient makes the characteristics of the first DPD meet the inverse function of the characteristics of the output signal of the first PA41 changing with the input signal in the TDD scenario. That is, the model coefficient makes the signal change characteristics of the signal to be processed after passing through the first DPD43 and the first PA41 in the TDD scenario still meet (or meet within a certain error range). Figure 6 The signal change characteristics of the signal to be processed after DPD and PA are shown in FIG. Therefore, it can be combined with Figure 6 The signal change characteristics of the signal to be processed after DPD and PA are shown to determine whether the model coefficients obtained by the training unit 40 can make the characteristics of the first DPD43 meet the "inverse function of the characteristics of the output signal of the first PA41 changing with the input signal in the TDD scenario".

[0185] It should be noted that before and after the above training process is completed, the adjacent channel leakage ratio (ACLR) of the PA signal output port will be significantly reduced.

[0186] The specific implementation of the bias circuit 42 is described below.

[0187] Mode 1: The bias circuit 42 is specifically configured to generate a bias signal based on a TDD timing signal. The bias circuit 42 provided in Mode 1 can be applied to both ET systems and non-ET systems.

[0188] In one implementation, Figure 12A FIG. 4 is a schematic diagram of the structure of a wireless communication device 4 provided in an embodiment of the present application. The bias circuit 42 in the wireless communication device 4 includes:

[0189] The TDD timing generation unit 421 is configured to generate a TDD timing signal, where the TDD timing signal is used to control the timing of the TDD system signal transmission switch.

[0190] The digital shaping unit 422 is used to shape the TDD timing signal. Optionally, the digital shaping unit 422 can be a filter, such as an RC filter or a CR filter, or a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter.

[0191] DAC423 is used to perform digital-to-analog conversion on the shaped TDD timing signal to obtain a bias signal.

[0192] In another implementation, Figure 12B FIG. 4 is a schematic diagram of the structure of another wireless communication device 4 provided in an embodiment of the present application. The bias circuit 42 in the wireless communication device 4 includes:

[0193] The TDD timing generation unit 421 is configured to generate a TDD timing signal, where the TDD timing signal is used to control the switching timing of the first PA 41 in a TDD scenario or the switching timing of a TDD system signal transmission.

[0194] DAC424 is used to perform digital-to-analog conversion on the TDD timing signal to obtain an analog signal.

[0195] The analog shaping unit 425 is used to shape the analog signal to obtain a bias signal.

[0196] In TDD scenarios, in order to achieve on / off control of RF front-end devices, the processor in the baseband subsystem (such as DSP or ASIC) usually generates a corresponding TDD timing signal, which is generally a digital step waveform. This waveform usually reflects the change in the average power of the transmitted signal. Therefore, the bias signal of DPD (such as ADC) can be generated by shaping and digital-to-analog converting the TDD timing signal. Figure 7C The “shaping” here can refer to the shaping of a digital signal or the shaping of an analog signal.

[0197] The components / modules in the bias circuit 42 may be implemented by software, hardware, or a combination of software and hardware, which is not limited in this application. For example, the TDD timing generation unit 421 may be implemented by hardware in a processor in the baseband subsystem, or by a processor in the baseband subsystem running a software program.

[0198] In the first approach, the TDD timing generation unit can be implemented using modules / devices used in conventional technologies to generate TDD timing signals. This means that this solution generates bias signals by processing existing TDD timing signals, eliminating the need for specialized modules / devices to generate bias signals. This reduces hardware overhead and the complexity and cost of signal processing. Furthermore, it eliminates the need to increase the complexity and cost of digital signal processing, such as DPD.

[0199] Method 2: The bias circuit 42 generates a bias signal based on the envelope signal of the ET system. The bias circuit 42 provided in Method 2 can be applied to the ET system.

[0200] Combine Figure 9 As can be seen, in an ET system, the wireless communication device also includes an envelope processor, a DAC, and an ET modulator. The envelope processor generates the ET system's envelope signal. The DAC performs digital-to-analog conversion on the envelope signal to generate an analog signal. The ET modulator modulates the analog signal to generate a power signal. This power signal is then input to the PA's power port.

[0201] In one implementation, Figure 13A FIG. 4 is a schematic diagram of the structure of a wireless communication device 4 provided in an embodiment of the present application. The bias circuit 42 in the wireless communication device 4 includes:

[0202] The envelope generating unit 426 is configured to generate an envelope signal of the ET system.

[0203] The digital shaping unit 427 is used to shape the envelope signal.

[0204] DAC428 is used for performing digital-to-analog conversion on the shaped envelope signal to obtain a bias signal.

[0205] In the ET system, the digital circuit part (such as baseband / digital intermediate frequency) generally includes a corresponding envelope generation unit to complete the generation of the envelope signal of the ET system, for example, see Figure 9The envelope generation unit 426 can be implemented by an envelope processor in the baseband subsystem. This envelope signal usually reflects the change in the average power of the transmitted signal. Therefore, the envelope signal can be shaped (such as filtering / smoothing) and processed, such as low-order IIR filtering, and then converted by digital-to-analog conversion to generate a bias signal (for example, Figure 7C bias signal shown).

[0206] In this implementation, the envelope generating unit may generate an envelope signal of the ET system by using a module / device (such as Figure 9 That is, the present technical solution generates a bias signal by processing the envelope signal of the ET system already existing in the traditional technology, and does not require a special module / device to generate the envelope signal of the ET system, thus helping to save hardware overhead and reduce the implementation complexity and cost of signal processing.

[0207] In another implementation, Figure 13B FIG. 4 is a schematic diagram of the structure of a wireless communication device 4 provided in an embodiment of the present application. The bias circuit 42 in the wireless communication device 4 includes:

[0208] The envelope generating unit 426 is configured to generate an envelope signal of the ET system.

[0209] DAC429 is used for performing digital-to-analog conversion on the envelope signal to obtain an analog signal of the envelope signal.

[0210] The analog shaping unit 430 is used to shape the analog signal to obtain a bias signal.

[0211] In this implementation, the analog signal of the envelope generating unit can be generated by a module / device (such as Figure 9 This technology is implemented using an envelope processor and DAC (in a conventional ET system). Specifically, this technology generates a bias signal by processing the analog envelope signal of the ET system, eliminating the need for dedicated modules or devices to generate the ET system's envelope signal. This helps save hardware overhead and reduces the complexity and cost of signal processing. Furthermore, it eliminates the need to increase the complexity and cost of digital signal processing, such as DPD.

[0212] It should be noted that the digital shaping unit in any of the above implementations may be located in the digital circuit part of the wireless communication device, such as Figure 2 The DAC can be located in the digital circuit part of the wireless communication device (such as Figure 2 The analog shaping unit may be located in the analog circuit part of the wireless communication device.

[0213] It should be noted that for the sake of simplicity, Figure 13A and Figure 13B In the figure, the bias circuit 42 is not shown. Figure 13A In the embodiment, the DAC and ET modulator for generating the power supply signal are used as devices in the wireless communication device 4; Figure 13B In the embodiment, the ET modulator for generating the power supply signal is used as a component in the wireless communication device 4. In actual implementation, the embodiment of the present application is not limited thereto. For example, the wireless communication device 4 may not include these components.

[0214] It should be noted that the shaping in the process of shaping the envelope signal to obtain the PA power signal is a small-scale shaping, while the shaping in the process of shaping the envelope signal to obtain the PA bias signal is a large-scale shaping.

[0215] Method 3: The bias circuit 42 is specifically configured to generate a bias signal based on the switching signal of the first PA. The bias circuit 42 provided in Method 1 can be applied to both ET systems and non-ET systems. Specifically, the bias circuit 42 can include a switching signal generating unit, etc.

[0216] The switching timing of the first PA 41 can be the same as or different from the switching timing of the TDD system signal transmission. In one example, the input signal of the first PA 41 can be considered synchronized with the TDD timing signal. Therefore, the modules / devices used to generate the bias signal based on the switching signal of the first PA 41 can refer to the above-mentioned method 1. Of course, the specific implementation is not limited to this.

[0217] It should be noted that the TDD timing generation unit, envelope signal generation unit, and switch signal generation unit may correspond to (or be equivalent to) the signal acquisition circuit mentioned above. The analog shaping unit and digital shaping unit may correspond to (or be equivalent to) the smoothing filter circuit mentioned above.

[0218] The following describes a specific implementation of the bias circuit when the wireless communication device includes multiple PAs, taking a MIMO scenario as an example, but is not limited thereto.

[0219] Current communication systems, especially mobile communication systems, generally use multiple-input multiple-output (MIMO) technology to increase system capacity or coverage. In a MIMO scenario, a wireless communication device includes multiple transmission channels, each of which typically includes a DPD and PA. The following describes the technical solutions provided by embodiments of the present application for use in MIMO scenarios.

[0220] In one implementation, in a MIMO scenario, an independent bias signal generation circuit is designed for the PA of each transmission channel in a wireless communication device. In this way, the bias signal of each transmission channel can be independently controlled.

[0221] like Figure 14 FIG. 4 is a structural diagram of a wireless communication device 4 applied to a MIMO scenario based on the above-mentioned method 1. The wireless communication device 4 includes a first transmission channel and a second transmission channel. The first transmission channel includes the above-mentioned Figure 12A The second transmission channel includes a second DPD 46, a second PA 44, and a second bias circuit 45. The second bias circuit 45 includes: a TDD timing generation unit 451, a digital shaping unit 452, and a DAC 453. The connection relationship between these devices can be referred to Figure 14 . The second DPD46 is used to process the second processed signal to obtain a second signal. After the second signal is processed by the intermediate device, an input signal is obtained. The input signal is sent to the signal input port of the second PA44. The TDD timing generation signal 451 in the second bias circuit 45 is used to generate a TDD timing signal, and send the TDD timing signal to the digital shaping unit 452 for shaping. The signal obtained after shaping is converted from digital to analog by DAC453 to obtain a bias signal. The bias signal is sent to the bias port of the second PA. The second PA44 is used to amplify the input signal under the control of the bias signal to obtain an output signal. Optionally, the first processed signal and the second processed signal may be the same or different.

[0222] It should be noted that another implementation method of the above-mentioned method 1 and the two implementation methods of the above-mentioned method 2, when applied to the MIMO scenario, can also independently generate a configuration signal for each transmitting channel, thereby realizing independent control of the bias signal of each transmitting channel, which is not described here.

[0223] In another implementation, in a MIMO scenario, the PAs of at least two transmit channels in a wireless communication device can share a bias signal. Compared to designing a separate bias signal for each transmit channel, this solution helps save hardware resources, lower hardware implementation costs, and reduce hardware size. This technical solution is particularly suitable for devices with strict cost and size requirements, such as mobile terminals and customer premises equipment (CPE).

[0224] Based on the aforementioned approach, both base stations and terminal devices currently employ digital beam forming (DBF) for MIMO transmission weighting. In this approach, although the transmit signals (corresponding to the first and second processed signals) of different transmit channels can differ, their TDD timing signals are generally consistent. This means that when bias signals are generated using the aforementioned approach, different transmit channels can share a single bias signal.

[0225] like Figure 15 As shown, it is a structural diagram of a wireless communication device 4 applied to a MIMO scenario provided by the first implementation method based on the above-mentioned method 1. This technical solution can be applied to ET-MIMO scenarios and non-ET-MIMO scenarios. The wireless communication device 4 includes: a first transmission channel and a second transmission channel. The first transmission channel includes the above-mentioned Figure 12A The components / modules shown in FIG. The second transmission channel includes a second DPD 46 and a second PA 44. The second DPD 46 is configured to process the second processed signal to obtain a second signal. After the second signal is processed by the intermediate component, an input signal is obtained. This input signal is transmitted to the signal input port of the second PA 44. The bias signal generated in the first transmission channel is fed into the bias port of the second PA 44. The second PA 44 is configured to amplify the input signal under the control of the bias signal to obtain an output signal. In this example, the bias signal can also be used to compensate for the self-bias effect of the second PA.

[0226] Optionally, the first processed signal and the second processed signal may be the same or different.

[0227] like Figure 16 As shown, it is a structural diagram of a wireless communication device 4 applied to a MIMO scenario based on the first implementation of the above-mentioned method 2. This technical solution can be applied to the ET-MIMO scenario. The wireless communication device 4 includes: a first transmission channel and a second transmission channel. The first transmission channel includes the above-mentioned Figure 13A The modules / devices included in the second transmission channel and the functions of each module / device can refer to the above Figure 15 The description of the functions of the modules / devices in the second sending channel will not be repeated here.

[0228] It should be noted that, when the second implementation of the above-mentioned method 1 and the second implementation of the above-mentioned method 2 are applied in a MIMO scenario, different transmission channels may also share configuration signals, which is not described here.

[0229] It should be noted that the technical solutions mentioned above applied to MIMO scenarios all use the same method (to generate configuration signals for different transmission channels. Scalable, different transmission channels can use different methods to generate configuration signals. For example, the wireless communication device includes a first transmission channel, a second transmission channel, and a third transmission channel; wherein the first transmission channel and the second transmission channel share a bias signal, and the bias signal is generated based on the first implementation method of the above-mentioned method one; and the third transmission channel uses the first implementation method of the above-mentioned method two to generate a configuration signal. Other examples are not listed one by one.

[0230] The following describes a signal processing method provided by an embodiment of the present application.

[0231] like Figure 17 FIG2 is a flow chart of a signal processing method provided in an embodiment of the present application. The method can be applied to a wireless communication device, which includes a first PA. The wireless communication device can be the wireless communication device 4 provided above, and the first PA can be the first PA 41 described above. The method includes the following steps S201 to S203:

[0232] S201: The wireless communication device generates a bias signal, which is used to compensate for a characteristic of a first PA that varies with an input signal in a TDD scenario. In combination with any of the wireless communication devices 4 provided above, S201 may be performed by the bias circuit 42.

[0233] Optionally, the wireless communication device generates a bias signal based on a switching signal or a TDD timing signal of the first PA. For example, first, a TDD timing signal is generated. Then, the TDD timing signal is shaped and the shaped signal is digital-to-analog converted to obtain a bias signal; alternatively, the TDD timing signal is digital-to-analog converted to obtain an analog signal of the TDD timing signal; and the analog signal of the TDD timing signal is shaped to obtain a bias signal.

[0234] Optionally, in the ET system, the wireless communication device generates a bias signal based on an envelope signal of the ET system. For example, the envelope signal is first generated. Then, the envelope signal is shaped; the filtered signal is digital-to-analog converted to obtain the bias signal; or, the envelope signal is digital-to-analog converted to obtain an analog version of the envelope signal; the analog signal is shaped to obtain the bias signal.

[0235] For example, in conjunction with the above, generating a TDD timing signal may be performed by the TDD timing generation unit 421. Generating an envelope signal may be performed by the envelope generation unit 426. Shaping a digital signal (such as a TDD timing signal or an envelope signal) may be performed by a digital shaping unit, and shaping an analog signal (such as an analog signal of the TDD timing signal or an analog signal of the envelope signal) may be performed by an analog shaping unit. Digital-to-analog conversion may be performed by a DAC.

[0236] S202: The wireless communication device performs pre-distortion processing on the first signal to be processed to obtain a first signal to compensate for the distortion characteristics of the first PA. In combination with any of the wireless communication devices 4 provided above, S202 can be performed by the first DPD 43.

[0237] The embodiment of the present application does not limit the execution order of S201 and S202.

[0238] S203: The wireless communication device enables the first PA and amplifies the input signal of the first PA based on the bias signal. The input signal of the first PA is generated based on the first signal. In combination with the wireless communication device 4 provided above, the amplification step can be performed by the first PA 41.

[0239] As an example, the above S201 to S203 can be considered as the execution stage, specifically the stage of performing signal amplification. In actual implementation, optionally, before the execution stage, the above method can also include a pre-processing stage, specifically the stage of obtaining the model parameters used for pre-distortion processing and the bias signal of the first PA. Specifically: Figure 18 As shown, the pre-processing stage may include S101 to S102:

[0240] S101: The wireless communication device adjusts the parameters of the wireless communication device to generate a pre-bias signal; wherein the bias signal is a pre-bias signal that satisfies the requirement of compensating for the characteristic of the first PA changing with the input signal in a TDD scenario; the pre-bias signal is used to adjust the relationship between the output signal and the input signal of the first PA. Figure 11B In the provided wireless communication device 4 , the adjustment step may be performed by the bias circuit 42 .

[0241] S102: The wireless communication device performs training based on the output signal and input signal of the first PA to obtain the model coefficients used in the pre-distortion processing; wherein the model coefficients make the characteristics of the pre-distortion processing satisfy the inverse function of the characteristics of the output signal of the first PA changing with the input signal in the TDD scenario. Figure 11BIn the provided wireless communication device 4, the training step may be performed by a training unit 40. Optionally, the wireless communication device performs training based on the output signal and input signal of the first PA and a model extraction algorithm to obtain model coefficients used in predistortion processing; wherein the model extraction algorithm includes a least squares method or a minimum mean square error algorithm.

[0242] In this case, the above S201 may include: S201A, the wireless communication device generates a bias signal based on a target parameter; wherein the target parameter is a parameter of the wireless communication device when obtaining the model coefficient.

[0243] In this case, the above S202 may include: S202A, the wireless communication device performs pre-distortion processing on the first signal to be processed based on the model coefficient to obtain a first signal to compensate for the distortion characteristics of the first PA.

[0244] Optionally, the wireless communication device includes a first transmission channel and a second transmission channel; the first transmission channel includes a first PA; and the second transmission channel includes a second PA. In this case, Figure 18 On the basis of, the method further includes S204 to S205, such as Figure 19 As shown. Specifically:

[0245] S204: The wireless communication device performs pre-distortion processing on the second signal to be processed to obtain a second signal to compensate for the distortion characteristics of the second PA. Figure 14 The wireless communication device 4 provided, S204 may be executed by the second DPD 44 .

[0246] S205: The wireless communication device uses a second PA and amplifies the input signal of the second PA based on the bias signal; wherein the input signal of the second PA is generated based on the second signal. The bias signal is also used to compensate for the characteristics of the second PA that change with the input signal in the TDD scenario. Figure 14 In the provided wireless communication device 4 , S205 may be executed by the second PA 45 .

[0247] The embodiment of the present application does not limit the execution order of S202 to S203 and S204 to S205. For example, S202 to S203 may be executed first and then S204 to S205, or S204 to S205 may be executed while S202 to S203 are being executed.

[0248] For the detailed description of the relevant contents in any of the above steps, please refer to the description of the wireless communication device 4, which will not be repeated here. In addition, for the description of the beneficial effects of any of the above methods, please refer to the description of the corresponding wireless communication device 4, which will not be repeated here.

[0249] Another embodiment of the present application further provides a computer-readable storage medium, which stores instructions. When the instructions are executed by a terminal, the terminal executes each step in the method flow shown in the above method embodiment.

[0250] In some embodiments, the disclosed methods may be implemented as computer program instructions encoded in a machine-readable format on a computer-readable storage medium or on other non-transitory media or articles of manufacture.

[0251] Should be understood that the arrangement described here is only for the purpose of example. Thus, those skilled in the art will understand that other arrangements and other elements (such as, machines, interfaces, functions, sequences, and functional groups, etc.) can be used instead, and some elements can be omitted altogether according to the desired result. In addition, many of the described elements can be implemented as discrete or distributed components or in any appropriate combination and position in conjunction with the functional entities implemented by other components.

[0252] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer execution instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more media that can be integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0253] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless communication device, characterized in that: include: A power amplifier and a bias circuit; wherein, The power amplifier includes a signal input port, a signal output port, a power supply port and a bias port. The power amplifier is used to receive a power signal from the power supply port, receive a bias signal from the bias port, receive a radio frequency signal from the signal input port, and output the power-amplified radio frequency signal through the signal output port; The bias circuit is connected to the bias port and is used to generate the bias signal, wherein the timing characteristics of the bias signal are synchronized with the timing characteristics of the switching signal of the power amplifier in the time division duplexing TDD scenario to compensate for the nonlinear changes of the power amplifier in the TDD scenario; the bias signal is generated based on the switching signal or TDD timing signal or envelope signal of the power amplifier.

2. The wireless communication device according to claim 1, wherein: The bias circuit includes: a smoothing filter circuit, configured to receive a switching signal of the power amplifier and perform smoothing filtering on the switching signal of the power amplifier to generate the bias signal.

3. The wireless communication device according to claim 2, wherein: The bias circuit further includes: a signal acquisition circuit, configured to generate a switching signal for the power amplifier.

4. The wireless communication device according to claim 1, wherein: The bias circuit includes a smoothing filter circuit configured to receive a TDD timing signal and perform smoothing filtering on the TDD timing signal to generate the bias signal.

5. The wireless communication device according to claim 4, wherein: The bias circuit further includes: a signal acquisition circuit, configured to generate the TDD timing signal.

6. The wireless communication device according to claim 1, wherein: The wireless communication device is applied to an envelope tracking ET system; The bias circuit includes a smoothing filter circuit configured to receive an envelope signal of the ET system and perform smoothing filtering on the envelope signal to generate the bias signal.

7. The wireless communication device according to claim 6, wherein: The bias circuit further includes: a signal acquisition circuit, configured to generate the envelope signal.

8. The wireless communication device according to any one of claims 1 to 7, wherein: The wireless communication device includes a plurality of the power amplifiers and at least one bias circuit, wherein the at least one bias circuit is connected to bias ports of the plurality of power amplifiers.

9. The wireless communication device according to claim 8, wherein: The multiple power amplifiers belong to different radio frequency transmission channels respectively, and the different radio frequency transmission channels are used for multiple-input multiple-output MIMO communication.

10. The wireless communication device according to any one of claims 1 to 7, wherein: The wireless communication device is integrated into a radio frequency front-end device RFFE.

11. The wireless communication device according to any one of claims 1 to 7, wherein: The wireless communication device is integrated into a radio frequency integrated circuit (RFIC).

12. The wireless communication device according to any one of claims 1 to 7, wherein: The wireless communication device is applied to an ET system and is integrated into an ET chip.

13. A signal processing method, characterized in that: Applied to a wireless communication device, the wireless communication device including a power amplifier; the method comprising: generating a bias signal, wherein a timing characteristic of the bias signal is synchronized with a timing characteristic of a switching signal of the power amplifier in a time division duplex (TDD) scenario to compensate for nonlinear changes of the power amplifier in the TDD scenario; the bias signal is generated based on the switching signal or the TDD timing signal or the envelope signal of the power amplifier; The power amplifier is enabled, and amplifies the radio frequency signal input to the power amplifier based on the bias signal and the power supply signal.

14. The method according to claim 13, characterized in that Generating a bias signal comprises: The switching signal of the power amplifier is smoothed and filtered to generate the bias signal.

15. The method according to claim 14, characterized in that The method further comprises: A switching signal for the power amplifier is generated.

16. The method according to claim 13, characterized in that Generating a bias signal comprises: The TDD timing signal is smoothed and filtered to generate the bias signal.

17. The method according to claim 16, characterized in that The method further comprises: The TDD timing signal is generated.

18. The method according to claim 13, characterized in that The wireless communication device is applied to an envelope tracking (ET) system; the generating of the bias signal includes: The envelope signal of the ET system is smoothed and filtered to generate the bias signal.

19. The method according to claim 18, characterized in that The method further comprises: The envelope signal is generated.

20. The method according to any one of claims 13 to 19, characterized in that The wireless communication device includes a plurality of the power amplifiers, and at least two of the plurality of power amplifiers share the bias signal.

21. The method according to claim 20, characterized in that The multiple power amplifiers belong to different radio frequency transmission channels respectively, and the different radio frequency transmission channels are used for multiple-input multiple-output MIMO communication.

22. The method according to any one of claims 13 to 19, characterized in that The wireless communication device is integrated into a radio frequency front-end device RFFE.

23. The method according to any one of claims 13 to 19, characterized in that: The wireless communication device is integrated into a radio frequency integrated circuit (RFIC).

24. The method according to any one of claims 13 to 19, characterized in that: The wireless communication device is applied to an ET system and is integrated into an ET chip.

25. A wireless communication device, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store a computer program, and when the processor calls the computer program, the method according to any one of claims 13 to 24 is executed.

26. A computer-readable storage medium, characterized in that A computer program is stored, and when the computer program is run on a wireless communication device, the wireless communication device is caused to perform the method according to any one of claims 13 to 24.

27. A wireless communication system, characterized in that: Comprising a terminal and a base station; wherein the terminal or the base station comprises the wireless communication device according to any one of claims 1 to 12 or claim 25.

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