DPD correction method, system and device

Abstract

The invention provides a DPD correction method, system and device, and relates to the technical field of communication. In the embodiment of the invention, the output signals of the n PAs needing to be subjected to DPD correction can be combined into one fusion signal for feedback, and the digital feedback signal corresponding to each of the n PAs can be separated subsequently, so that the correction parameter corresponding to each PA can be calculated, and further the DPD correction of the forward signal of each PA can be realized. Based on the scheme of the invention, the DPD correction of the n PAs can be realized, the feedback of the output signals of the n PAs only needs one feedback loop, and the feedback of the output signals of the n PAs does not need to be carried out in a time-sharing manner, so that the hardware cost of designing the feedback loop for carrying out the DPD correction on the n PAs can be saved, and the time for carrying out the DPD correction on the n PAs can be greatly shortened.

Description

Technical Field

[0001] The present application relates to the field of communication technologies, and in particular, to a digital pre-distortion (DPD) correction method, system, and device. Background Art

[0002] A power amplifier (PA) is a device specifically designed to amplify radio frequency signals and can increase the power of radio frequency signals. However, the PA has performance bottlenecks. When the input power of the PA increases to a certain value, the output signal of the PA and the input signal no longer have a linear amplification relationship, and the signal will be distorted. To avoid signal distortion, the input power at which the PA operates is restricted to a certain extent.

[0003] In the field of wireless communication, the DPD technology can be used to perform DPD correction on the signal before it enters the power amplifier to compensate for or even cancel the nonlinear distortion generated by the PA. The DPD technology can expand the linear operating range of the PA, and thus can increase the input power at which the PA operates.

[0004] In the system architecture of DPD correction, the output signal of the PA needs to be fed back to the DPD calculation module through a feedback loop so that the DPD calculation module can recalculate the correction parameters for DPD correction according to the distortion condition of the output signal of the PA, and then optimize the compensation for the nonlinear distortion of the PA.

[0005] When performing DPD correction on a wireless communication device including multiple PAs, the output signals of multiple PAs all need to be fed back through a feedback loop. To save hardware costs, in one implementation, the output signals of multiple PAs can share the same feedback loop and be fed back in a time-division manner. However, this will increase the overall DPD calibration time of the device, and thus increase the production cost of the device. Summary of the Invention

[0006] The present application provides a DPD correction method, system, and device for solving the problem in the prior art that the DPD correction time for multiple PAs is long, resulting in a high production cost of the device.

[0007] To achieve the above object, the present application adopts the following technical solutions.

[0008] In a first aspect, a DPD correction device is provided, which includes: an analog signal fusion module, an ADC, a digital signal separation module, n DPD solution modules and n DPD correction modules. The analog signal fusion module is connected to the ADC, the ADC is also connected to the digital signal separation module, the digital signal separation module is also connected to the n DPD solution modules, the i-th DPD solution module among the n DPD solution modules is connected to the i-th DPD correction module among the n DPD correction modules, n is an integer equal to or greater than 2, and i is any integer from 1 to n. The analog signal fusion module is used to receive the output signals of n PAs, merge the output signals of the n PAs into a fused analog feedback signal, and send the fused analog feedback signal to the ADC. The i-th PA among the n PAs is connected to the i-th DPD correction module. The ADC is used to convert the fused analog feedback signal into a fused digital feedback signal, and send the fused digital feedback signal to the digital signal separation module. The digital signal separation module is used to obtain n digital feedback signals based on the fused digital feedback signal and the forward signals of n PAs, and send the i-th digital feedback signal among the n digital feedback signals to the i-th DPD solution module among the n DPD solution modules. The i-th DPD solution module is used to determine the correction parameters corresponding to the i-th PA based on the i-th digital feedback signal and the forward signal of the i-th PA, and send the correction parameters corresponding to the i-th PA to the i-th DPD correction module. The i-th DPD correction module performs DPD correction on the forward signal of the i-th PA based on the correction parameters corresponding to the i-th PA.

[0009] The above-mentioned DPD correction device can fuse the output signals of n PAs together for feedback, and can subsequently separate the digital feedback signal corresponding to each of the n PAs. The DPD correction device can also calculate the correction parameters corresponding to each PA based on each separated digital feedback signal, and then perform DPD correction on the forward signal of each PA. Based on this, the feedback of the output signals of n PAs only requires one feedback loop, and the feedback of the output signals of n PAs does not need to be performed in time-sharing, which can save the hardware cost of designing the feedback loop for DPD correction of n PAs, and can greatly shorten the time for n PAs to perform DPD correction, thereby reducing the production cost of wireless devices including n PAs.

[0010] In combination with the first aspect above, as a possible implementation method, the i-th digital feedback signal among the n digital feedback signals is determined based on the fused digital feedback signal and the forward signals of n-1 PAs among the n PAs except the i-th digital feedback signal.

[0011] Combined with the first aspect above, as a possible implementation, the digital signal separation module is further configured to determine n compensation coefficients according to the fused digital feedback signal and the forward signals of n PAs. The i-th compensation coefficient among the n compensation coefficients corresponds to the i-th PA. The i-th digital feedback signal is determined according to the fused digital feedback signal and the forward signals of n - 1 PAs among the n PAs except the i-th PA, and may include: the i-th digital feedback signal is determined according to the fused digital feedback signal, the forward signals of n - 1 PAs among the n PAs except the i-th PA, and the i-th compensation coefficient.

[0012] Combined with the first aspect above, as a possible implementation, the fused digital feedback signal is f(k), the i-th digital feedback signal is y i (k), the forward signal of the i-th PA is x i (k), and the i-th compensation coefficient is c i . Among them,

[0013] Combined with the first aspect above, as a possible implementation, the digital signal separation module is further configured to determine n compensation coefficients according to the fused digital feedback signal and the forward signals of n PAs, and may include: the digital signal separation module is further configured to determine n compensation coefficients according to the matrix of the fused digital feedback signal and the combined matrix of the forward signals of n PAs.

[0014] Combined with the first aspect above, as a possible implementation, the difference between the product of the combined matrix of the n compensation coefficients and the combined matrix of the forward signals of the n PAs and the matrix of the fused digital feedback signal is 0.

[0015] Combined with the first aspect above, as a possible implementation, the matrix of the fused digital feedback signal is The matrix of the forward signal of the i-th PA is The combined matrix of the forward signals of n PAs is V = (V1……V n ), and the matrix of the i-th compensation coefficient is The combined matrix of the n compensation coefficients is S is the number of sampling points, and M is the memory depth. Among them,

[0016] Combined with the above first aspect, as a possible implementation, the DPD correction device further includes a down-conversion module, and the down-conversion module can be connected between the analog signal fusion module and the ADC. The analog signal fusion module sends the fused analog feedback signal to the ADC, which may include: the analog signal fusion module forwards the fused analog feedback signal to the ADC through the down-conversion module. Wherein, the down-conversion module is used to perform down-conversion processing on the fused analog feedback signal.

[0017] Combined with the above first aspect, as a possible implementation, the digital signal separation module sends the i-th digital feedback signal among the n digital feedback signals to the i-th DPD solving module, which may include: the digital signal separation module performs time-delay alignment and gain alignment on the i-th digital feedback signal according to the forward signal of the i-th PA. Then, the digital signal separation module sends the i-th digital feedback signal after time-delay alignment and gain alignment to the i-th DPD solving module.

[0018] Combined with the above first aspect, as a possible implementation, the digital signal separation module may include: the digital signal separation module includes: a signal separation component, n time-delay alignment components, and n gain alignment components. The signal separation component is connected to the n time-delay alignment components, the i-th time-delay alignment component among the n time-delay alignment components is connected to the i-th gain alignment component among the n gain alignment components, and the i-th gain alignment component is further connected to the i-th DPD solving module. Wherein, the signal separation component is used to determine n digital feedback signals according to the fused digital feedback signal and the forward signals of the n PAs, and send the i-th digital feedback signal among the n digital feedback signals to the i-th time-delay alignment component. The i-th time-delay alignment component is used to perform time-delay alignment on the i-th digital feedback signal according to the forward signal of the i-th PA, and send the i-th digital feedback signal after time-delay alignment to the i-th gain alignment component. The i-th gain alignment component is used to perform gain alignment on the i-th digital feedback signal after time-delay alignment according to the forward signal of the i-th PA, and send the i-th digital feedback signal after time-delay alignment and gain alignment to the i-th DPD solving module.

[0019] In a second aspect, a DPD correction method is provided, which may include: receiving output signals of n power amplifiers PA, where n is an integer equal to or greater than 2. Combining the output signals of the n PAs into a fused analog feedback signal. Converting the fused analog feedback signal into a fused digital feedback signal. Obtaining n digital feedback signals based on the fused digital feedback signal and the forward signals of the n PAs. Among them, the i-th digital feedback signal among the n digital feedback signals corresponds to the i-th PA among the n PAs, and i is any integer from 1 to n. Obtaining a correction parameter corresponding to the i-th PA based on the i-th digital feedback signal and the forward signal of the i-th PA. Performing DPD correction on the forward signal of the i-th PA according to the i-th correction parameter.

[0020] According to this method, the output signals of n PAs can be integrated for feedback, and subsequently, the digital feedback signals corresponding to each of the n PAs can be separated. Each separated digital feedback signal can be used to calculate the correction parameters corresponding to each PA, and then the forward signal of each PA can be DPD corrected according to the correction parameters corresponding to each PA. Based on this, the feedback of the output signals of n PAs only requires one feedback loop, and the feedback of the output signals of n PAs does not need to be performed in time-sharing, which can save the hardware cost of designing the feedback loop for DPD correction of n PAs, and can greatly shorten the time for n PAs to perform DPD correction, thereby reducing the production cost of wireless devices including n PAs.

[0021] In combination with the above second aspect, as a possible implementation manner, the i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of n-1 PAs except the i-th PA among the n PAs.

[0022] In combination with the above-mentioned second aspect, as a possible implementation, the method may further include: the digital signal separation module is also used to determine n compensation coefficients based on the fused digital feedback signal and the forward signals of n PAs, and the i-th compensation coefficient among the n compensation coefficients corresponds to the i-th PA. The i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of n-1 PAs other than the i-th PA among the n PAs, and may include: the i-th digital feedback signal is determined based on the fused digital feedback signal, the forward signals of n-1 PAs other than the i-th PA among the n PAs, and the i-th compensation coefficient.

[0023] In combination with the above second aspect, as a possible implementation method, the fused digital feedback signal is f(k), and the i-th digital feedback signal is y i (k), the forward signal of the i-th PA is x i (k), the i-th compensation coefficient is c i .in,

[0024] Combined with the above second aspect, as a possible implementation manner, determining a plurality of compensation coefficients according to the fused digital feedback signal and the forward signals of multiple PAs may include: determining a plurality of compensation coefficients according to the matrix of the fused digital feedback signal and the combined matrix of the forward signals of multiple PAs.

[0025] Combined with the above second aspect, as a possible implementation manner, the difference between the product of the combined matrix of n compensation coefficients and the combined matrix of the forward signals of n PAs and the matrix of the fused digital feedback signal is 0.

[0026] Combined with the above second aspect, as a possible implementation manner, the matrix of the fused digital feedback signal is The matrix of the forward signal of the i-th PA is The combined matrix of the forward signals of n PAs is V=(V1……V n ), and the matrix of the i-th compensation coefficient is The combined matrix of n compensation coefficients is S is the number of sampling points, and M is the memory depth. Wherein,

[0027] In a third aspect, a DPD calibration system is provided, and the DPD calibration system may include: the DPD calibration device in the above first aspect, n digital-to-analog converters DAC, n up-conversion modules, and n power amplifiers PA, where n is an integer equal to or greater than 2. Among them, the n DPD calibration modules in the DPD calibration device are connected to the n DACs in one-to-one correspondence, and the i-th DPD calibration module among the n DPD calibration modules corresponds to the i-th DAC among the n DACs. The n DACs are also connected to the n up-conversion modules in one-to-one correspondence, and the i-th DAC among the n DACs corresponds to the i-th up-conversion module among the n up-conversion modules. The n up-conversion modules are also connected to the n PAs in one-to-one correspondence, and the i-th up-conversion module among the n up-conversion modules corresponds to the i-th PA among the n PAs. The n PAs are also connected to the analog signal fusion module in the DPD calibration device. i is any integer from 1 to n. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a system architecture for DPD calibration provided by an embodiment of the present application;

[0029] Figure 2 It is another schematic diagram of a system architecture for DPD calibration provided by an embodiment of the present application;

[0030] Figure 3A time allocation schematic diagram for n-channel time-division execution of DPD calibration provided by an embodiment of the present application;

[0031] Figure 4 A structural schematic diagram of a DPD calibration device provided by an embodiment of the present application;

[0032] Figure 5 A structural schematic diagram of a digital signal separation module provided by an embodiment of the present application;

[0033] Figure 6 A flowchart schematic diagram of a DPD calibration method provided by an embodiment of the present application;

[0034] Figure 7 A structural schematic diagram of a DPD calibration system provided by an embodiment of the present application;

[0035] Figure 8 A structural schematic diagram of another DPD calibration system provided by an embodiment of the present application;

[0036] Figure 9 A structural schematic diagram of yet another DPD calibration system provided by an embodiment of the present application. Detailed implementation manners

[0037] For ease of understanding, first, some simple introductions to the related technologies involved in the present application are made.

[0038] Figure 1 It is a schematic diagram of a DPD calibration system architecture. As Figure 1 shown, the system may include: a DPD calibration module 101, a digital-to-analog converter (DAC) 102, an up-conversion module 103, a PA 104, a down-conversion module 105, an analog-to-digital converter (ADC) 106, and a DPD calculation module 107. Among them, the DPD calibration module 101 is connected to the DAC 102, the DAC 102 is further connected to the up-conversion module 103, the up-conversion module 103 is further connected to the PA 104, the PA 104 is further connected to the down-conversion module 105, the down-conversion module 105 is further connected to the ADC 106, the ADC 106 is further connected to the DPD calculation module 107, and the DPD calculation module 107 is further connected to the DPD calibration module 101.

[0039] In Figure 1In the shown system architecture, the DPD correction module 101 is used to receive the forward signal, perform DPD correction on the forward signal, and then output it to the DAC 102. The DAC 102 is used to perform digital-to-analog conversion on the signal from the DPD correction module 101 and then output it to the up-conversion module 103. The up-conversion module 103 is used to perform up-conversion processing on the signal from the DAC 102 and then output it to the PA 104. The PA 104 is used to perform power amplification on the signal from the up-conversion module 103 and then output it to the antenna, and then transmit it from the antenna. In addition, a part of the output signal of the PA 104 can be fed back to the down-conversion module 105. The down-conversion module 105 can perform down-conversion processing on the signal from the PA 104 and then output it to the ADC 106. The ADC 106 is used to perform analog-to-digital conversion on the signal from the down-conversion module 105 and then output it to the DPD calculation module 107. The DPD calculation module 107 can be used to calculate the correction parameters according to the signal from the ADC 106 and the forward signal input to the DPD correction module 101, and output the correction parameters to the DPD correction module 101. The DPD correction module 101 can also perform DPD correction on the subsequent received forward signal according to the correction parameters from the DPD calculation module 107.

[0040] It should be understood that in Figure 1 the shown system architecture, the DPD correction module is connected in series before the PA, and can perform DPD correction on the forward signal in advance, so as to compensate for the non-linear distortion generated by the subsequent PA.

[0041] In some scenarios, the wireless device may include multiple PAs, and these multiple PAs can share a feedback loop to feedback the output signal. Figure 2 Another schematic diagram of the system architecture for DPD correction is shown. As Figure 2 shown, the system may include: multiple DPD correction modules 201, multiple DACs 202, multiple up-conversion modules 203, multiple PAs 204, a first multiplexer 205, a down-conversion module 206, an ADC 207, a DPD calculation module 208, a second multiplexer 209, and a third multiplexer 210. Among them, the multiple DPD correction modules 201, the multiple DACs 202, the multiple up-conversion modules 203, and the multiple PAs 204 are connected in one-to-one correspondence. The multiple PAs 204 are also connected to the down-conversion module 206 through the first multiplexer 205. The down-conversion module 206 is also connected to the ADC 207. The ADC 207 is also connected to the DPD calculation module 208. The DDP calculation module 208 is also connected to the multiple DPD correction modules 201 through the second multiplexer 209. The DDP calculation module 208 also receives the forward signal through the third multiplexer 210.

[0042] In Figure 2 the shown system architecture, the DPD correction module 201 can refer toFigure 1 Regarding the relevant description of the DPD calibration module 101 in [reference], DAC 202 can refer to Figure 1 Regarding the relevant description of DAC 102 in [reference], the down-conversion module 203 can refer to Figure 1 Regarding the relevant description of the down-conversion module 103 in [reference], PA 204 can refer to Figure 1 Regarding the relevant description of PA 104 in [reference], it will not be elaborated here. Different from the system shown in Figure 1 The system shown in Figure 2 includes multiple signal channels formed by connecting multiple DPD calibration modules, multiple DACs, multiple up-conversion modules, and multiple PAs. The output signal of a PA 204 in one of the multiple signal channels can be fed back to the down-conversion module 206 through the first multiplexer 205. The down-conversion module 206 can refer to Figure 1 Regarding the relevant description of the down-conversion module 105 in [reference], the function of ADC 207 can refer to Figure 1 Regarding the relevant description of ADC 106 in [reference], it will not be elaborated here. The DPD calculation module 208 can receive the output signal of a PA 204 processed by the down-conversion module 206 and ADC 207, and receive the forward signal of this PA 204 through the third multiplexer 210. The DPD calculation module 208 can determine the calibration parameters corresponding to this PA according to the output signal and the forward signal of this PA 204, and output the calibration parameters corresponding to this PA to the DPD calibration module 201 connected to this PA 204 through the second multiplexer 209. The function of the DPD calibration module 201 can refer to Figure 1 Regarding the relevant description of the DPD calibration module 101 in [reference], it will not be elaborated here.

[0043] It should be understood that through the selection of the first multiplexer 205, the second multiplexer 209, and the third multiplexer 210, Figure 2 multiple PAs 204 in multiple signal channels can reuse the same feedback loop (including the above-mentioned down-conversion module 206 and ADC 207) to execute the DPD calibration process. Since the multiplexer can only select one path to be connected at a time, the DPD calibration of these multiple signal channels needs to be carried out time-divisionally.

[0044] Exemplarily, assume Figure 2 the number of signal channels in [reference] is n, and the time allocation schematic diagram for the n channels to execute DPD calibration time-divisionally can be as shown in Figure 3 First, channel 1 can execute DPD calibration, then channel 2 can execute DPD calibration, and so on. Finally, channel n can execute DDP calibration.

[0045] It should be understood that the multiple signal channels corresponding to multiple PAs executing DPD calibration time-divisionally will result in a relatively long total duration of DPD calibration. For example, as shown inFigure 3 As shown, the total time for n channels to perform calibration is the sum of the times taken for the n channels to perform DPD calibration individually. Based on this, the more PAs a device includes, the longer the time required for DPD calibration during the production of the device. This increases the production line calibration time of the device, and thus increases the production cost.

[0046] In view of this, the present application provides a DPD calibration method, system and device. The output signals of multiple PAs can be combined into a single integrated analog feedback signal and fed back through the same feedback loop. This integrated analog feedback signal can then be digitally separated to calculate the calibration parameters corresponding to the multiple PAs, thereby achieving DPD calibration for the multiple PAs. Compared with the case where the feedback loop does not need to be time-division multiplexed, the solution of the present application can greatly shorten the total time for DPD calibration of multiple PAs, and thus can reduce the cost of the product.

[0047] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application. Among them, in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship. For example, A / B can represent A or B. The "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. Also, in the description of the present application, unless otherwise specified, "multiple" means two or more than two. "At least one (item)" or similar expressions below refer to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple. In addition, in order to clearly describe the technical solutions in the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. Those skilled in the art can understand that the words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not necessarily mean different. At the same time, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific way for easy understanding.

[0048] The present application provides a DPD calibration device as follows Figure 4As shown, the DPD calibration device 40 may include: an analog signal fusion module 401, an ADC 402, a digital signal separation module 403, n DPD calculation modules 404 (such as Figure 4 the DPD calculation modules 404_1 to 404_n in Figure 4 ) and n DPD calibration modules 405 (such as Figure 4 the DPD calibration modules 405_1 to 405_n in ), where n is an integer equal to or greater than 2. Among them,

[0049] the analog signal fusion module 401 is connected to the ADC 402.

[0050] The ADC 402 is also connected to the digital signal separation module 403.

[0051] The digital signal separation module 403 is also connected to n DPD calculation modules 404. As Figure 4 shown, the digital signal separation module 403 is connected to each of the DPD calculation modules 404_1 to 404_n.

[0052] The n DPD calculation modules 404 are connected to the n DPD calibration modules 405 in a one-to-one correspondence. The DPD calculation module 404_i is connected to the DPD calibration module 405_i, where i is any integer from 1 to n. In the embodiments of the present application, the DPD calculation module 404_i may be referred to as the i-th DPD calculation module 404 among the n DPD calculation modules 404, and these two descriptions can be interchanged. The DPD calibration module 405_i may be referred to as the i-th DPD calibration module 405 among the n DPD calibration modules 405, and these two descriptions can be interchanged. This is explained uniformly here.

[0053] The n DPD calibration modules 405 may be connected to the input ends of n PAs 406 (such as Figure 4 the PAs 406_1 to 406_n in ) outside the DPD calibration device in a one-to-one correspondence. The DPD calibration module 405_i is connected to the PA 406_i. In the embodiments of the present application, the PA 406_i may be referred to as the i-th PA 406 among the n PAs 406, and these two descriptions can be interchanged. This is explained uniformly here.

[0054] Figure 4

[0055] Figure 4 The functions of the various modules in the DPD calibration device 40 shown in

[0056] The analog signal fusion module 401 may be configured to receive output signals of n PAs 406 , merge the output signals of the n PAs 406 into a fused analog feedback signal, and send the fused analog feedback signal to the ADC 402 .

[0057] The ADC 402 may be configured to receive the fused analog feedback signal, convert the fused analog feedback signal into a fused digital feedback signal, and send the fused digital feedback signal to the digital signal separation module 403 .

[0058] The digital signal separation module 403 can be used to receive the fused digital feedback signal and the forward signals of n PAs 406, obtain n digital feedback signals according to the fused digital feedback signal and the forward signals of n PAs 406, and send the n digital feedback signals to n DPD solution modules 404. The digital signal separation module 403 can send the i-th digital feedback signal among the n digital feedback signals to the DPD solution module 404_i.

[0059] The DPD solution module 404_i can be used to receive the i-th digital feedback signal and the forward signal of PA406_i, obtain the correction parameters corresponding to PA406_i according to the i-th digital feedback signal and the forward signal of PA406_i, and send the correction parameters corresponding to PA406_i to the DPD correction module 405_i.

[0060] The DPD correction module 405_i may be configured to perform DPD correction on the forward signal of the PA 406_i according to the correction parameters corresponding to the PA 406_i.

[0061] Based on the scheme of the embodiment of the present application, the DPD correction device can fuse the output signals of n PAs together for feedback, and can subsequently separate the digital feedback signal corresponding to each of the n PAs. The DPD correction device 40 can also calculate the correction parameters corresponding to each PA based on the separated digital feedback signal corresponding to each PA, and then perform DPD correction on the forward signal of each PA. Based on this, the DPD correction device 40 can implement DPD correction of the forward signals of n PAs, and the feedback of the output signals of n PAs only requires one feedback loop, and the feedback of the output signals of the n PAs does not need to be performed in time-sharing. Thereby, the hardware cost of designing the feedback loop for DPD correction of n PAs can be saved, and the time for DPD correction of n PAs can be greatly shortened, thereby reducing the production cost of wireless devices including n PAs.

[0062] Alternatively, if Figure 4As shown, the DPD calibration device 40 may further include a down-conversion module 407. The down-conversion module 407 may be connected between the analog signal fusion module 401 and the ADC 402, and may be configured to perform down-conversion processing on the fused analog feedback signal from the analog signal fusion module 401 and then transmit it to the ADC 402.

[0063] Optionally, the i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of n - 1 PA406s among the n PA406s excluding PA406_i.

[0064] Optionally, the digital signal separation module 403 may further be configured to determine n compensation coefficients based on the fused digital feedback signal and the forward signals of n PA406s. The i-th compensation coefficient among the n compensation coefficients corresponds to PA406_i. The i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of n - 1 PA406s among the n PA406s excluding PA406_i, and specifically may include: the i-th digital feedback signal is determined based on the fused digital feedback signal, the forward signals of n - 1 PA406s among the n PA406s excluding PA406_i, and the compensation coefficients corresponding to n - 1 PA406s among the n PA406s excluding PA406_i.

[0065] In one implementation, the fused digital feedback signal may be represented as f(k), the i-th digital feedback signal may be represented as y i (k), the forward signal of PA406_i may be represented as x i (k), and the compensation coefficient corresponding to PA406_i may be represented as c i . The above parameters may satisfy the following relationship:

[0066] Optionally, the digital signal separation module 403 determining n compensation coefficients based on the fused digital feedback signal and the forward signals of n PA406s may include: the digital signal separation module 403 determines n compensation coefficients based on the matrix of the fused digital feedback signal and the combined matrix of the forward signals of n PA406s.

[0067] As one implementation, the difference between the product of the combined matrix of n compensation coefficients and the combined matrix of the forward signals of n PA406s and the matrix of the fused digital feedback signal is 0, and the digital signal separation module 403 may solve for the n compensation coefficients based on this relationship.

[0068] In one implementation, the matrix of the fused digital feedback signal may be where S is the number of sampling points, and this matrix F is a S×1 matrix.

[0069] The matrix of the forward signal of PA406_i can be where S is the number of sampling points, M is the memory depth of sampling, and the matrix V i is an S×M matrix, and each element in the matrix V i is a sequence of length M obtained by sampling the forward signal x i (k).

[0070] The combined matrix of the forward signals of n PA406s from PA406_1 to PA406_n can be V = (V1……V n ), and the combined matrix V is horizontally merged from the matrices V1,……,V n of the forward signals of PA406_1 to PA406_n.

[0071] The matrix of the compensation coefficients corresponding to PA406_i can be where T represents the transpose of the matrix, M is the memory depth of sampling, and the matrix C i is a M×1 matrix.

[0072] The combined matrix of the n compensation coefficients corresponding to n PA406s from PA406_1 to PA406_n is The combined matrix C is vertically merged from the matrices C1,……,C n of the compensation coefficients corresponding to PA406_1 to PA406_n.

[0073] The matrix F for fusing digital feedback signals, the combined matrix V of the forward signals of n PAs, and the combined matrix C of n compensation coefficients can satisfy the following relationship: where represents the 2-norm of the matrix. It should be understood that the smaller the 2-norm of the matrix, the closer the matrix is to the true value.

[0074] In the embodiments of the present application, it can be assumed that Based on this equation, the compensation coefficients are solved.

[0075] As an implementation, the least squares method can be used to solve this equation, and the following relationship can be calculated: C = (V H ·V) -1 ·V H ·F. Where V H represents the conjugate transpose of V, (V H ·V) represents the autocorrelation matrix of V, and (V H ·V) -1 represents the inverse matrix of the autocorrelation matrix of V.

[0076] Since V = (V1……V n ), so C = (V H ·V) -1 ·V H ·F can be specifically expressed as:

[0077] Among them, is the autocorrelation matrix of (V1……V n ), is the inverse matrix of the autocorrelation matrix of (V1……V n ), is the conjugate transpose of (V1……V n ).

[0078] Based on this, substituting the matrix F of the above-mentioned fused digital feedback signal f(k) and the actual sampling values of the forward signals of n PAs, V1,……,V n into the above formula, the matrices C1,……,C n of n compensation coefficients can be solved, and then the values of n compensation coefficients c1,……,c n can be determined.

[0079] When the values of n compensation coefficients are solved, the digital signal separation module can separate n digital feedback signals from the fused digital feedback signal.

[0080] Optionally, as another possible implementation, the above equation can also use the least mean square (LMS) algorithm to solve for C.

[0081] Optionally, the digital signal separation module 403 sends the i-th digital feedback signal among the n digital feedback signals to the DPD calculation module 404_i, specifically including: the digital signal separation module 403 performs time delay alignment and gain alignment on the i-th digital feedback signal according to the forward signal of PA406_i. After that, the digital signal separation module sends the i-th digital feedback signal after time delay alignment and gain alignment to the DPD calculation module 404_i.

[0082] As an implementation, as Figure 5 shown, the digital signal separation module 403 may include: a signal separation component 403a, n time delay alignment components 403b (such as 403b1 to 403bi in Figure 4 ), and n gain alignment components 403c (such as 403c1 to 403ci in Figure 4 ). Among them,

[0083] The signal separation component 403a is connected to n time-delay alignment components 403b.

[0084] The n time-delay alignment components 403b are also connected to n gain alignment components 403c in a one-to-one correspondence, and the time-delay alignment component 403bi is connected to the gain alignment component 403ci. In the embodiments of the present application, the time-delay alignment component 403bi can be referred to as the i-th time-delay alignment component 403b among the n time-delay alignment components 403b, and these two descriptions can be interchanged. A unified description is provided here.

[0085] The n gain alignment components 403c are also connected to the above-mentioned n DPD calculation modules 404 in a one-to-one correspondence, and the gain alignment component 403ci is connected to the DPD calculation module 404_i. In the embodiments of the present application, the gain alignment component 403ci can be referred to as the i-th gain alignment component 403c among the n gain alignment components 403c, and these two descriptions can be interchanged. A unified description is provided here.

[0086] The signal separation component 403a can be used to determine n digital feedback signals according to the fused digital feedback signal and the forward signals of n PAs, and send the n digital feedback signals to the n time-delay alignment components 403b respectively. Among them, the i-th digital feedback signal among the n digital feedback signals can be sent to the time-delay alignment component 403bi.

[0087] The time-delay alignment component 403bi can be used to perform time-delay alignment on the i-th digital feedback signal according to the forward signal of PA406_i, and send the time-delay-aligned i-th digital feedback signal to the gain alignment component 403ci.

[0088] The gain alignment component 403ci can be used to perform gain alignment on the time-delay-aligned i-th digital feedback signal according to the forward signal of PA406_i, and send the time-delay-aligned and gain-aligned i-th digital feedback signal to the DPD calculation module 404_i.

[0089] The present application also provides a DPD correction method 600. The schematic flow diagram of this method can be as Figure 6 shown, and can include S601 to S606.

[0090] S601. Receive the output signals of n PAs.

[0091] S602. Combine the output signals of n PAs into a fused analog feedback signal.

[0092] S603. Convert the fused analog feedback signal into a fused digital feedback signal.

[0093] S604. Obtain n digital feedback signals based on the fused digital feedback signal and the forward signals of n PAs. Among them, the i-th digital feedback signal among the n digital feedback signals corresponds to the i-th PA among the n PAs.

[0094] S605. Obtain the correction parameter corresponding to the i-th PA based on the i-th digital feedback signal and the forward signal of the i-th PA.

[0095] S606. Perform DPD correction on the forward signal of the i-th PA according to the correction parameter corresponding to the i-th PA.

[0096] Among them, the implementation manners of the above S601 and S602 can refer to the implementation manner of the analog signal fusion module 401 described above, the implementation manner of S603 can refer to the implementation manner of the ADC 402 described above, the implementation manner of S604 can refer to the implementation manner of the digital signal separation module 403 described above, the implementation manner of S605 can refer to the implementation manner of the DPD calculation module 404 described above, and the implementation manner of S606 can refer to the implementation manner of the DPD correction module 405 described above. All can refer back to the previous descriptions and will not be elaborated here.

[0097] This application also provides a DPD correction system, as Figure 7 shown. The DPD correction system may include an analog signal fusion module 701, an ADC 702, a digital signal separation module 703, n DPD calculation modules 704 (such as Figure 7 the DPD calculation module 704_1 to the DPD calculation module 704_n), n DPD correction modules 705 (such as Figure 7 the DPD correction module 705_1 to the DPD correction module 705_n), n DACs 706 (such as Figure 7 the DAC 706_1 to the DAC 706_n), n up-conversion modules 707 (such as Figure 7 the up-conversion module 707_1 to the up-conversion module 707_n) and n PAs 708 (such as Figure 7 the PA 708_1 to the PA 708_n). Among them,

[0098] the analog signal fusion module 701 corresponds to Figure 4 the analog signal fusion module 401, the ADC 702 corresponds to Figure 4 the ADC 402, the digital signal separation module 703 corresponds to Figure 4 the digital signal separation module 403, the DPD calculation module 704 corresponds to Figure 4 the DPD calculation module 404, the DPD correction module 705 corresponds to Figure 4The DPD correction module 405 therein. For the connection relationship among the analog signal fusion module 701, the ADC 702, the digital signal separation module 703, the n DPD calculation modules 704, and the n DPD correction modules 705, reference can be made to Figure 4 the connection relationship among the analog signal fusion module 401, the ADC 402, the digital signal separation module 403, the n DPD calculation modules 404, and the n DPD correction modules 405 in it, which will not be elaborated here.

[0099] The n DPD correction modules 705 are connected to the n DACs 706 in a one-to-one correspondence, and the DPD correction module 705_i is connected to the DAC 706_i. In the embodiments of the present application, the DPD correction module 705_i can be referred to as the i-th DPD correction module 705 among the n DPD correction modules 705, and these two descriptions can be interchanged. The DAC 706_i can be referred to as the i-th DAC 706 among the n DACs 706, and these two descriptions can be interchanged. This is uniformly stated here.

[0100] The n DACs 706 are connected to the n upconversion modules 707 in a one-to-one correspondence, and the DAC 706_i is connected to the upconversion module 707_i. In the embodiments of the present application, the upconversion module 707_i can be referred to as the i-th upconversion module 707 among the n upconversion modules 707, and these two descriptions can be interchanged. This is uniformly stated here.

[0101] The n upconversion modules 707 can be connected to the n PAs 708 in a one-to-one correspondence, and the upconversion module 707_i is connected to the PA 708_i. In the embodiments of the present application, the PA 708_i can be referred to as the i-th PA 708 among the n PAs 708, and these two descriptions can be interchanged. This is uniformly stated here.

[0102] The n PAs 708 are also connected to the analog signal fusion module 701.

[0103] Optionally, the DPD correction system may further include a downconversion module 709, and the downconversion module 709 is connected between the analog signal fusion module 701 and the ADC 702. For the functional role of the downconversion module 709, reference can be made to the relevant description of the downconversion module 407 above, which will not be elaborated here.

[0104] It should be understood that Figure 7 any number of devices or modules in the shown DPD correction system can be combined, and the above Figure 4 shown DPD correction device 40 is only an example provided by the present application. In actual implementation, there may be other combination methods, and the present application is not limited thereto.

[0105] As an implementation, the up-conversion module in the embodiments of the present application may at least include an up-conversion mixer (mixer). In addition, the up-conversion module may further include devices such as a low-pass filter (LPF) and a pre-power amplifier (PPA). It should be understood that there are various implementation manners for the up-conversion module in the art, and the present application does not make any limitations.

[0106] As an implementation, the down-conversion module in the embodiments of the present application may at least include a down-conversion mixer. In addition, the down-conversion module may further include devices such as an attenuator (ATT) and a variable gain amplifier (VGA). It should be understood that there are various implementation manners for the down-conversion module in the art, and the present application does not make any limitations.

[0107] As an implementation, the analog signal fusion module in the embodiments of the present application may be implemented by a combiner to perform power fusion on the output signals of n PAs.

[0108] Exemplarily, Figure 8 is a schematic structural diagram of another DPD calibration system provided by the present application. As Figure 8 shown, the DPD calibration system may include n DPD calibration modules 801 (such as Figure 8 the DPD calibration module 801_1 to the DPD calibration module 801_n in Figure 8 ), n DACs 802 (such as Figure 8 the DAC 802_1 to the DAC 802_n in Figure 8 ), n up-conversion mixers 803 (such as Figure 8 the up-conversion mixer 803_1 to the up-conversion mixer 803_n in

[0109] It should be understood that Figure 8 the DPD correction module 801 in Figure 7 can correspond to the DPD correction module 705 in Figure 8 the DAC 802 in Figure 7 can correspond to the DAC 706 in Figure 8 the PA 804 in Figure 7 can correspond to the PA 708 in, and the ADC 806 can correspond to Figure 7 the ADC 702 in, and the digital signal separation module 807 can correspond to Figure 7 the digital signal separation module 703 in, and the DPD calculation module 808 can correspond to Figure 7 the DPD calculation module 704 in. For relevant descriptions, please refer to the previous text and will not be elaborated here. Additionally, Figure 8 the up-conversion mixer 803 in Figure 7 can be used as the up-conversion module 707 in Figure 8 the combiner 805 in Figure 7 can be used as the analog signal fusion module 701 in

[0110] Optionally, Figure 8 the DPD correction system shown in Figure 8 can further include n LPFs 809 (such as LPF809_1 to LPF809_n in Figure 8 ) and n PPAs 810 (such as PPA810_1 to PPA810_n in Figure 7 ). The LPF809_i is connected between the DAC802_i and the up-conversion mixer 803_i, and the PPA810_i is connected between the up-conversion mixer 803_i and the PA804_i, where i is any integer from 1 to n. In this case, the LPF809, the up-conversion mixer 803, and the PPA810 can jointly serve as

[0111] Optionally, Figure 8 the DPD correction system shown in Figure 7 can further include a down-conversion mixer 811. The down-conversion mixer 811 can be connected between the combiner 805 and the ADC806, and this down-conversion mixer 811 can be used as

[0112] Optionally, Figure 8 the DPD correction system shown in Figure 7The down-conversion module 709 therein.

[0113] As an implementation manner, the analog signal fusion module in the embodiments of the present application can also be implemented by a down-conversion mixer to perform frequency fusion on the output signals of n PAs. It should be noted that when the analog signal fusion module is implemented by a down-conversion mixer, the down-conversion mixer can perform down-conversion processing on the output signal of each PA and then combine them into a fused analog feedback signal.

[0114] Exemplarily, Figure 9 is a schematic structural diagram of another DPD calibration system provided by the present application. As Figure 9 shown, the DPD calibration system can include n DPD calibration modules 901 (such as Figure 9 the DPD calibration module 901_1 to the DPD calibration module 901_n in Figure 9 ), n DACs 902 (such as Figure 9 the DAC 902_1 to the DAC 902_n in Figure 9 ), n up-conversion mixers 903 (such as Figure 9 the up-conversion mixer 903_1 to the up-conversion mixer 903_n in

[0115] It should be understood that Figure 9 the DPD calibration module 901 in Figure 7 can correspond to the DPD calibration module 705 in Figure 9 the DAC 902 in Figure 7 can correspond to the DAC 706 in Figure 9 the PA 904 in Figure 7 can correspond to the PA 708 in Figure 7 the ADC 906 can correspond to the ADC 702 inFigure 7 In the digital signal separation module 703, the DPD calculation module 908 can correspond to Figure 7 In the DPD calculation module 704, reference can be made to the relevant descriptions in the foregoing, which will not be elaborated here. Additionally, Figure 9 The up-conversion mixer 903 in Figure 7 can serve as the up-conversion module 707 in Figure 9 The down-conversion mixer 905 in Figure 7 can serve as both the analog signal fusion module 701 in Figure 7 and the down-conversion module 709 in

[0116] Optionally, Figure 9 The DPD calibration system shown in Figure 9 may further include n LPFs 909 (such as LPF909_1 to LPF909_n in Figure 9 ) and n PPAs 910 (such as PPA910_1 to PPA910_n in Figure 7 ). The LPF909_i is connected between the DAC902_i and the up-conversion mixer 903_i, and the PPA910_i is connected between the up-conversion mixer 903_i and the PA904_i, where i is any integer from 1 to n. In this case, the LPF909, the up-conversion mixer 903, and the PPA910 can jointly serve as

[0117] Optionally, Figure 8 The DPD calibration system shown in Figure 9 may further include n ATTs 911 (such as ATT911_1 to ATT911_n in Figure 7 ) and a VGA 912. The ATT911_i can be connected between the PA904_i and the down-conversion mixer 905, and the VGA912 can be connected between the down-conversion mixer 905 and the ADC806, where i is any integer from 1 to n. In this case, the down-conversion mixer 905, the ATT911, and the VGA912 can jointly serve as

[0118] Optionally, in the DPD calibration system shown in the above Figure 7 , Figure 8 or Figure 9 , the output signal of the PA can be coupled to the analog signal fusion module through a coupler, and the forward signal of the PA can also be coupled to the PDP calculation module and the digital signal separation module through a coupler, which is hereby noted.

[0119] It should be understood that in various embodiments of the present application, the magnitudes of the sequence numbers of the above processes do not imply the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0120] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0121] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0122] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of devices or units can be in an electrical, mechanical, or other form.

[0123] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0124] In addition, the functional units in various embodiments of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0125] 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 program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. 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 wire (such as coaxial cable, fiber optic, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). 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 includes one or more media integrated therein. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a digital versatile disc (DVD)), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0126] As used in this application, the terms "component", "module", "system", etc. are intended to refer to computer-related entities, which can be hardware, firmware, a combination of hardware and software, software, or software in operation. For example, a component can be, but is not limited to: a process running on a processor, a processor, an object, an executable file, a thread in execution, a program, and / or a computer. As an example, an application running on a computing device and the computing device can both be components. One or more components can exist in a process and / or thread in execution, and the components can be located in one computer and / or distributed between two or more computers. In addition, these components can execute from various computer-readable media having various data structures thereon. These components can communicate in a local and / or remote process manner through signals such as according to one or more data packets (for example, data from one component that interacts with another component in a local system, a distributed system, and / or communicates with other systems in a signal manner through a network such as the Internet).

[0127] Aspects, embodiments or features of the present application are presented in the context of a system that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all of the devices, components, modules, etc. discussed in connection with the figures. In addition, combinations of these solutions may also be used.

[0128] In addition, in the embodiments of the present application, the term "exemplary" is used to mean an example, illustration or demonstration. Any embodiment or design described as "exemplary" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the term "exemplary" is intended to present concepts in a concrete manner.

[0129] In the embodiments of the present application, the terms "information", "signal", and "message" may sometimes be used interchangeably. It should be noted that when the differences are not emphasized, their intended meanings are the same. The terms "of", "corresponding", and "corresponding to" may sometimes be used interchangeably. It should be noted that when the differences are not emphasized, their intended meanings are the same. The terms "system" and "network" may sometimes be used interchangeably. When the differences are not emphasized, their intended meanings are the same. For example, a "communication network" is also referred to as a "communication system".

[0130] The network architectures and service scenarios described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. As is known to those of ordinary skill in the art, with the evolution of network architectures and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0131] As described above, the above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A digital pre-distortion (DPD) correction device, characterized in that, The DPD correction device includes: an analog signal fusion module, an analog-to-digital converter ADC, a digital signal separation module, n DPD calculation modules, and n DPD correction modules; the analog signal fusion module is connected to the ADC, the ADC is further connected to the digital signal separation module, the digital signal separation module is further connected to the n DPD calculation modules, and the i-th DPD calculation module among the n DPD calculation modules is connected to the i-th DPD correction module among the n DPD correction modules; n is an integer equal to or greater than 2, and i is any integer from 1 to n; where, The analog signal fusion module is configured to receive output signals of n power amplifiers PA, combine the output signals of the n PAs into a fused analog feedback signal, and send the fused analog feedback signal to the ADC; where, the i-th PA among the n PAs is connected to the i-th DPD correction module; The ADC is configured to convert the fused analog feedback signal into a fused digital feedback signal and send the fused digital feedback signal to the digital signal separation module; The digital signal separation module is configured to determine n digital feedback signals based on the fused digital feedback signal and the forward signals of the n PAs, and send the i-th digital feedback signal among the n digital feedback signals to the i-th DPD calculation module; The i-th DPD calculation module is configured to determine a correction parameter corresponding to the i-th PA based on the i-th digital feedback signal and the forward signal of the i-th PA, and send the correction parameter corresponding to the i-th PA to the i-th DPD correction module; The i-th DPD correction module is configured to perform DPD correction on the forward signal of the i-th PA according to the correction parameter corresponding to the i-th PA.

2. The device according to claim 1, wherein The i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of n - 1 PAs among the n PAs other than the i-th PA.

3. The device according to claim 2, wherein, The digital signal separation module is further configured to determine n compensation coefficients based on the fused digital feedback signal and the forward signals of the n PAs, and the i-th compensation coefficient among the n compensation coefficients corresponds to the i-th PA; The i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of n - 1 PAs among the n PAs other than the i-th PA, including: The i-th digital feedback signal is determined based on the fused digital feedback signal, the forward signals of n - 1 PAs among the n PAs other than the i-th PA, and the i-th compensation coefficient.

4. The device according to claim 3, wherein, The fused digital feedback signal is f(k), and the i-th digital feedback signal is y i (k), the forward signal of the i-th PA is x i (k), and the i-th compensation coefficient is c i ; Among them, 5. The device according to claim 3 or 4, characterized in that, The digital signal separation module is further configured to determine the n compensation coefficients based on the fused digital feedback signal and the forward signals of the n PAs, including: The digital signal separation module is further configured to determine the n compensation coefficients according to the matrix of the fused digital feedback signal and the combined matrix of the forward signals of the n PAs.

6. The device according to claim 5, characterized in that, The difference between the product of the combined matrix of the n compensation coefficients and the combined matrix of the forward signals of the n PAs and the matrix of the fused digital feedback signal is 0.

7. The device according to claim 6, characterized in that The plurality is n, and n is an integer equal to or greater than 2; The matrix integrating the digital feedback signals is The matrix of the forward signal of the i-th PA is The combined matrix of the forward signals of the n PAs is V = (V1……V n ), and the matrix of the i-th compensation coefficient is The combined matrix of the n compensation coefficients is S is the number of sampling points, and M is the memory depth; Among them, 8. The device according to any one of claims 1-7, characterized in that The DPD correction device further includes a down-conversion module, and the down-conversion module is connected between the analog signal fusion module and the ADC; The analog signal fusion module sending the fused analog feedback signal to the ADC includes: The analog signal fusion module forwards the fused analog feedback signal to the ADC through the down-conversion module; Wherein, the down-conversion module is configured to perform down-conversion processing on the fused analog feedback signal.

9. The device according to any one of claims 1 to 8, characterized in that, The digital signal separation module sending the i-th digital feedback signal among the n digital feedback signals to the i-th DPD solving module includes: The digital signal separation module performs time delay alignment and gain alignment on the i-th digital feedback signal according to the forward signal of the i-th PA; The digital signal separation module sends the i-th digital feedback signal after time delay alignment and gain alignment to the i-th DPD solving module.

10. The device according to claim 9, characterized in that The digital signal separation module includes: a signal separation component, n time delay alignment components, and n gain alignment components. The signal separation component is connected to the n time delay alignment components. The i-th time delay alignment component among the n time delay alignment components is connected to the i-th gain alignment component among the n gain alignment components. The i-th gain alignment component is further connected to the i-th DPD solving module; wherein, The signal separation component is configured to determine the n digital feedback signals according to the fused digital feedback signal and the forward signals of the n PAs, and send the i-th digital feedback signal among the n digital feedback signals to the i-th time delay alignment component; The i-th time delay alignment component is configured to perform time delay alignment on the i-th digital feedback signal according to the forward signal of the i-th PA, and send the i-th digital feedback signal after time delay alignment to the i-th gain alignment component; The i-th gain alignment component is configured to perform gain alignment on the i-th digital feedback signal after time delay alignment according to the forward signal of the i-th PA, and send the i-th digital feedback signal after time delay alignment and gain alignment to the i-th DPD solving module.

11. A digital pre-distortion (DPD) correction method, characterized in that, The method includes: Receiving output signals of n power amplifiers (PAs), where n is an integer equal to or greater than 2; Combining the output signals of the n PAs into a fused analog feedback signal; Converting the fused analog feedback signal into a fused digital feedback signal; Obtaining n digital feedback signals according to the fused digital feedback signal and the forward signals of the n PAs; wherein, the i-th digital feedback signal among the n digital feedback signals corresponds to the i-th PA among the n PAs, and i is any integer from 1 to n; Obtain the calibration parameter corresponding to the i-th PA based on the i-th digital feedback signal and the forward signal of the i-th PA; Perform DPD calibration on the forward signal of the i-th PA according to the i-th calibration parameter.

12. The method according to claim 11, wherein The i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of the n - 1 PAs among the n PAs excluding the i-th PA.

13. The method according to claim 12, characterized in that, The method further includes: The digital signal separation module is further configured to determine n compensation coefficients based on the fused digital feedback signal and the forward signals of the n PAs, and the i-th compensation coefficient among the n compensation coefficients corresponds to the i-th PA; The i-th digital feedback signal is determined based on the fused digital feedback signal and the forward signals of the n - 1 PAs among the n PAs excluding the i-th PA, including: The i-th digital feedback signal is determined based on the fused digital feedback signal, the forward signals of the n - 1 PAs among the n PAs excluding the i-th PA, and the i-th compensation coefficient.

14. The method according to claim 13, wherein, The fused digital feedback signal is f(k), and the i-th digital feedback signal is y i (k), the forward signal of the i-th PA is x i (k), and the i-th compensation coefficient is c i ; Among them, 15. The method according to claim 13 or 14, characterized in that, The determining of the n compensation coefficients based on the fused digital feedback signal and the forward signals of the n PAs includes: Determine the n compensation coefficients based on the matrix of the fused digital feedback signal and the combined matrix of the forward signals of the n PAs.

16. The method according to claim 15, characterized in that, The difference between the product of the combined matrix of the n compensation coefficients and the combined matrix of the forward signals of the n PAs and the matrix of the fused digital feedback signal is 0.

17. The method according to claim 16, wherein, The matrix integrating the digital feedback signals is The matrix of the forward signal of the i-th PA is The combined matrix of the forward signals of the n PAs is V = (V1……V n ), and the matrix of the i-th compensation coefficient is The combined matrix of the n compensation coefficients is S is the number of sampling points, and M is the memory depth; Among them, 18. A digital pre-distortion (DPD) correction system, characterized in that, The DPD calibration system includes the DPD calibration device according to claims 1 - 10, and further includes n digital-to-analog converters DAC, n up-conversion modules, and n power amplifiers PA, where n is an integer equal to or greater than 2; The n DPD calibration modules in the DPD calibration device are connected to the n DACs in one-to-one correspondence, and the i-th DPD calibration module among the n DPD calibration modules corresponds to the i-th DAC among the n DACs, where i is any integer from 1 to n; The n DACs are further connected to the n up-conversion modules in one-to-one correspondence, and the i-th DAC among the n DACs corresponds to the i-th up-conversion module among the n up-conversion modules; The n up-conversion modules are further connected to the n PAs in one-to-one correspondence, and the i-th up-conversion module among the n up-conversion modules corresponds to the i-th PA among the n PAs; The n PAs are further connected to the analog signal fusion module in the DPD calibration device.

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