Method, apparatus, computer device and medium for suppressing third-order intermodulation distortion signals

Abstract

The present invention discloses a method, device, computer device and medium for suppressing third-order intermodulation distortion signals, relating to the field of signal processing. The method includes: when preset distortion suppression conditions are satisfied, acquiring an original input signal with a preset bandwidth of a radio frequency power amplifier circuit, and acquiring a third-order intermodulation signal corresponding to the original input signal based on a feedback circuit; constructing a third-order intermodulation suppression model based on the original input signal and the third-order intermodulation signal; solving model coefficients in the model; before the next satisfaction of the distortion suppression conditions, substituting target coefficients and the latest original input signal into the model to obtain an output result, inverting the output result to obtain a suppression signal, and then synthesizing the suppression signal and the latest original input signal to obtain an input signal of the radio frequency power amplifier circuit. Based on this, the present invention enables distortion suppression to be completed without a relatively high signal feedback bandwidth, reduces the sampling requirements of the feedback circuit, reduces the cost of distortion suppression, and improves the suppression efficiency.

Description

Technical Field

[0001] The present invention relates to the field of signal processing, and in particular, to a method, apparatus, computer device, and medium for suppressing third-order intermodulation distortion signals. Background Art

[0002] In a transmitter of a wireless communication system, a dual-band power amplifier is often used to save hardware resources, that is, two signals of different frequency bands are simultaneously transmitted on a radio frequency power amplifier circuit. Since the radio frequency power amplifier circuit is a non-linear system, when two signals of different frequency bands are simultaneously transmitted, it will cause the third-order intermodulation phenomenon of the power amplifier, that is, third-order intermodulation distortion signals are generated.

[0003] At present, the suppression of third-order intermodulation distortion signals is often achieved through a broadband digital predistortion model or digital post-compensation. Among them, the broadband digital predistortion model requires a high input signal bandwidth and signal feedback bandwidth, and the processing efficiency is low. Digital post-compensation requires converting the input signal to the digital domain for processing, which requires a high hardware cost. Therefore, how to efficiently and simply suppress third-order intermodulation distortion signals has become one of the urgent problems to be solved at present. Summary of the Invention

[0004] In view of this, the present invention provides a method, apparatus, computer device, and medium for suppressing third-order intermodulation distortion signals, which are used to solve the problem of how to efficiently and simply suppress third-order intermodulation distortion signals.

[0005] In a first aspect, an embodiment of the present invention provides a method for suppressing third-order intermodulation distortion signals, including:

[0006] When a preset distortion suppression condition is satisfied, obtain an original input signal with a preset bandwidth of a radio frequency power amplifier circuit, and obtain a third-order intermodulation signal corresponding to the original input signal based on a feedback circuit, where the radio frequency power amplifier circuit and the feedback circuit are electrically connected;

[0007] Construct a third-order intermodulation suppression model based on the original input signal and the third-order intermodulation signal, where the third-order intermodulation suppression model is used to describe the third-order intermodulation distortion characteristics of the radio frequency power amplifier circuit, the output parameter of the third-order intermodulation suppression model is the third-order intermodulation signal, and the input parameters include basis functions and model coefficients, and the basis functions are composed of the original input signal;

[0008] Solve the model coefficients in the third-order intermodulation suppression model to obtain target coefficients;

[0009] Before the next satisfaction of the distortion suppression condition, substitute the target coefficient and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the RF power amplifier circuit.

[0010] Optionally, in a feasible manner provided by an embodiment of the present invention, it further includes:

[0011] Based on the feedback circuit, obtain the signal power of the third-order intermodulation signal corresponding to each of the original input signals;

[0012] When the preset distortion suppression condition is satisfied, obtain the original input signal within a preset bandwidth, and based on the feedback circuit, obtain the third-order intermodulation signal corresponding to the original input signal, including:

[0013] If the signal power reaches the preset power, obtain the original input signal within a preset bandwidth, and based on the feedback circuit, obtain the third-order intermodulation signal corresponding to the original input signal;

[0014] Before the next satisfaction of the distortion suppression condition, substitute the target coefficient and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the RF power amplifier circuit, including:

[0015] Before the signal power reaches the preset power next time, substitute the target coefficient and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the RF power amplifier circuit.

[0016] Optionally, in a feasible manner provided by an embodiment of the present invention, solving the model coefficients in the third-order intermodulation suppression model to obtain the target coefficient includes:

[0017] Based on the least squares method, solve the model coefficients in the third-order intermodulation suppression model to obtain the target coefficient.

[0018] Optionally, in a feasible manner provided by an embodiment of the present invention, the original input signal includes a high-frequency signal and a low-frequency signal with different signal center frequencies, the third-order intermodulation signal includes a lower-band third-order intermodulation signal and an upper-band third-order intermodulation signal, and the third-order intermodulation suppression model includes:

[0019]

[0020] where y IMD3_L (n) represents the nth third-order intermodulation signal in the lower frequency band, and y IMD3_U (n) represents the nth third-order intermodulation signal in the upper frequency band, and the value range of n is [1, 2,..., L] T , L represents the number of signals of the original input signal of the preset bandwidth, bl k，q and bu k，q both represent model coefficients, and both represent basis functions, x U and x L respectively represent the high-frequency signal and the low-frequency signal, x U * and x L * respectively represent the conjugate signal of the high-frequency signal and the conjugate signal of the low-frequency signal, K is the memory depth, and Q is the nonlinear order.

[0021] In a second aspect, an embodiment of the present invention provides a device for suppressing third-order intermodulation distortion signals, including:

[0022] An acquisition module, configured to acquire the original input signal of the preset bandwidth of the radio frequency power amplifier circuit and acquire the third-order intermodulation signal corresponding to the original input signal based on the feedback circuit when the preset distortion suppression condition is satisfied, wherein the radio frequency power amplifier circuit and the feedback circuit are electrically connected;

[0023] A construction module, configured to construct a third-order intermodulation suppression model based on the original input signal and the third-order intermodulation signal, wherein the third-order intermodulation suppression model is used to describe the third-order intermodulation distortion characteristics of the radio frequency power amplifier circuit, the output parameter of the third-order intermodulation suppression model is the third-order intermodulation signal, and the input parameters include basis functions and model coefficients, and the basis functions are composed of the original input signal;

[0024] A solution module, configured to solve the model coefficients in the third-order intermodulation suppression model to obtain target coefficients;

[0025] An input module, configured to substitute the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result before the next satisfaction of the distortion suppression condition, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit.

[0026] Optionally, in a feasible manner provided by an embodiment of the present invention, it further includes:

[0027] A power acquisition module, configured to acquire the signal power of the third-order intermodulation signal corresponding to each of the original input signals based on the feedback circuit;

[0028] The acquisition module is further configured to, if the signal power reaches a preset power, acquire the original input signals within a preset bandwidth, and acquire the third-order intermodulation signals corresponding to the original input signals based on the feedback circuit;

[0029] The input module is further configured to, before the signal power reaches the preset power next time, substitute the target coefficient and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal and the latest original input signal to obtain the input signal of the RF power amplifier circuit.

[0030] Optionally, in a feasible manner provided by an embodiment of the present invention, the solving module is further configured to solve the model coefficients in the third-order intermodulation suppression model based on the least square method to obtain the target coefficient.

[0031] Optionally, in a feasible manner provided by an embodiment of the present invention, the original input signals include a high-frequency signal and a low-frequency signal with different signal center frequencies, the third-order intermodulation signals include a lower-band third-order intermodulation signal and an upper-band third-order intermodulation signal, and the third-order intermodulation suppression model includes:

[0032]

[0033]

[0034] wherein, y IMD3_L (n) represents the nth lower-band third-order intermodulation signal, y IMD3_U (n) represents the nth upper-band third-order intermodulation signal, and the value range of n is [1, 2,..., L] T , L represents the number of signals of the original input signals within the preset bandwidth, bl k，q and bu k，q both represent model coefficients, and both represent basis functions, x U and x L respectively represent the high-frequency signal and the low-frequency signal, x U * and x L * respectively represent the conjugate signal of the high-frequency signal and the conjugate signal of the low-frequency signal, K is the memory depth, and Q is the nonlinear order.

[0035] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor. The memory stores a computer program, and when the computer program runs on the processor, it executes any one of the methods for suppressing third-order intermodulation distortion signals disclosed in the first aspect.

[0036] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program runs on the processor, it executes any one of the methods for suppressing third-order intermodulation distortion signals disclosed in the first aspect.

[0037] In the method for suppressing third-order intermodulation distortion signals provided by the embodiments of the present invention, first, when a preset distortion suppression condition is satisfied, an original input signal with a preset bandwidth of a radio frequency power amplifier circuit is acquired, and a third-order intermodulation signal corresponding to the original input signal is acquired based on a feedback circuit; then, a third-order intermodulation suppression model is constructed based on the original input signal and the third-order intermodulation signal; the model coefficients in the third-order intermodulation suppression model are solved to obtain target coefficients that can characterize the power amplifier characteristics of the radio frequency power amplifier circuit; finally, before the next time the distortion suppression condition is satisfied, the target coefficients and the latest original input signal are substituted into the third-order intermodulation suppression model to obtain an output result, and the inversion of the output result is performed to obtain a third-order intermodulation suppression signal, and the third-order intermodulation suppression signal is synthesized with the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit. Based on this, the present invention enables the suppression process of third-order intermodulation distortion signals to be completed without a relatively high signal feedback bandwidth, reducing the sampling requirements of the feedback circuit; and, since the embodiments of the present invention can achieve third-order intermodulation suppression only by introducing a feedback circuit in hardware, and the suppression of third-order intermodulation distortion signals can be achieved only based on the calculation results of the original input signal and the model coefficients, the distortion suppression cost is reduced, and the suppression of third-order intermodulation distortion signals can be efficiently completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the protection scope of the present invention. In each drawing, similar components are numbered similarly.

[0039] Figure 1 FIG. shows a schematic flow chart of a first method for suppressing third-order intermodulation distortion signals provided by an embodiment of the present invention;

[0040] Figure 2 FIG. shows a schematic flow chart of a second method for suppressing third-order intermodulation distortion signals provided by an embodiment of the present invention;

[0041] Figure 3The flowchart of the third method for suppressing third-order intermodulation distortion signals provided by the embodiments of the present invention is shown;

[0042] Figure 4 The schematic diagram of the signal simulation result provided by the embodiments of the present invention is shown;

[0043] Figure 5 The structural schematic diagram of the device for suppressing third-order intermodulation distortion signals provided by the embodiments of the present invention is shown. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0045] Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but only represents the selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0046] Hereinafter, the terms "including", "having" and their cognates that can be used in various embodiments of the present invention are only intended to represent specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be construed as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0047] In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0048] Unless otherwise limited, all terms (including technical terms and scientific terms) used herein have the same meaning as those commonly understood by those of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in a general-use dictionary) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in various embodiments of the present invention.

[0049] Embodiment 1

[0050] Refer to Figure 1, which shows a schematic flowchart of the first method for suppressing third-order intermodulation distortion signals provided by the embodiments of the present invention. The method for suppressing third-order intermodulation distortion signals provided by the embodiments of the present invention includes:

[0051] Step S110, when the preset distortion suppression condition is satisfied, obtain the original input signal within the preset bandwidth of the radio frequency power amplifier circuit, and obtain the third-order intermodulation signal corresponding to the original input signal based on the feedback circuit, where the radio frequency power amplifier circuit and the feedback circuit are electrically connected.

[0052] It should be noted that in the embodiments of the present invention, when the distortion suppression condition is satisfied, it indicates that there is a relatively serious signal distortion phenomenon in the radio frequency power amplifier circuit, and thus distortion suppression is required. It can be understood that the setting of the distortion suppression condition can be set according to the actual situation.

[0053] It should also be noted that in the embodiments of the present invention, the radio frequency power amplifier circuit and the feedback circuit are electrically connected. After the radio frequency power amplifier circuit receives the input signal, it will generate an output signal. The feedback circuit is used to detect the output signal generated by the radio frequency power amplifier circuit. In other words, the output signal / feedback signal refers to the signal transformed after the original signal passes through the non-linear system (i.e., the radio frequency power amplifier circuit).

[0054] In addition, it is not difficult to understand that since the embodiments of the present invention are directed to the suppression of third-order intermodulation distortion signals, the original input signal in the embodiments of the present invention is a dual-frequency signal, which includes a high-frequency signal and a low-frequency signal with different signal center frequencies.

[0055] Optionally, in a feasible manner provided by the embodiments of the present invention, the output signal corresponding to the high-frequency signal, the low-frequency signal corresponding to the low-frequency signal, and the third-order intermodulation signal are obtained based on the feedback circuit. The third-order intermodulation signal includes a lower-band third-order intermodulation signal and an upper-band third-order intermodulation signal. Among them, assuming that the signal center frequencies of the low-frequency signal and the high-frequency signal in the original input signal are ω1 and ω2 respectively, the signal center frequency of the lower-band third-order intermodulation signal in the feedback signal is 2ω1 - ω2, and the signal center frequency of the upper-band third-order intermodulation signal is 2ω2 - ω1.

[0056] Step S120, construct a third-order intermodulation suppression model based on the original input signal and the third-order intermodulation signal, where the third-order intermodulation suppression model is used to describe the third-order intermodulation distortion characteristics of the radio frequency power amplifier circuit. The output parameter of the third-order intermodulation suppression model is the third-order intermodulation signal, and the input parameters include basis functions and model coefficients, and the basis functions are composed of the original input signal.

[0057] That is, the embodiments of the present invention will use the third-order intermodulation suppression model to simulate the third-order intermodulation distortion characteristics of the radio frequency power amplifier circuit and reflect the relationship between the third-order intermodulation signal and the original input signal.

[0058] Furthermore, in the third-order intermodulation suppression model in the embodiments of the present invention, it includes basis functions, model coefficients, and output parameters. The calculation result of the product of the basis functions and the model coefficients is the output parameter (i.e., the third-order intermodulation signal).

[0059] It can be understood that the specific form of the third-order intermodulation suppression model in the embodiments of the present invention can be set according to the actual situation. For example, in a feasible manner provided in the embodiments of the present invention, since the memory polynomial can well represent the memory effect and nonlinear characteristics of the radio frequency power amplifier circuit, the memory polynomial is used to construct the third-order intermodulation suppression model.

[0060] In another feasible manner, since the two terms that contribute the most to the third-order intermodulation are respectively the product of the high-frequency signal and its conjugate signal in the original input signal, and the product of the low-frequency signal and its conjugate signal in the original input signal, on the basis of the above-mentioned construction of the third-order intermodulation suppression model based on the memory polynomial, the product of the high-frequency signal and its conjugate signal and the product of the low-frequency signal and its conjugate signal are also used to construct the third-order intermodulation suppression model.

[0061] Optionally, in a feasible manner provided in the embodiments of the present invention, the original input signal includes a high-frequency signal and a low-frequency signal with different signal center frequencies. The third-order intermodulation signal includes a lower-band third-order intermodulation signal and an upper-band third-order intermodulation signal. The third-order intermodulation suppression model includes:

[0062]

[0063] where y IMD3_L (n) represents the nth lower-band third-order intermodulation signal, y IMD3_U (n) represents the nth upper-band third-order intermodulation signal, and the value range of n is [1, 2,..., L] T , L represents the number of signals of the original input signal with the preset bandwidth, bl k，q and bu k，q both represent model coefficients, and both represent basis functions, x U and x L respectively represent the high-frequency signal and the low-frequency signal, x U * and x L * respectively represent the conjugate signal of the high-frequency signal and the conjugate signal of the low-frequency signal, K is the memory depth, and Q is the nonlinear order.

[0064] It is not difficult to find that the above-mentioned third-order intermodulation suppression model proposed in the embodiments of the present invention is the result of modeling in the frequency band at the third-order intermodulation distortion. Therefore, only a small feedback bandwidth is required when solving the above model. It is not difficult to think that it is also possible to understand modeling for other frequency bands to obtain the corresponding third-order intermodulation suppression model, which can be specifically selected according to the actual situation.

[0065] Step S130, solve the model coefficients in the third-order intermodulation suppression model to obtain the target coefficients.

[0066] That is to say, in the embodiments of the present invention, the model coefficients in the third-order intermodulation suppression model will be solved to determine the only unknown in the third-order intermodulation suppression model.

[0067] It can be understood that there are various ways to solve the third-order intermodulation suppression model, and the solution method is the content that can be selected according to the actual situation. For example, in a feasible way provided in the embodiments of the present invention, specifically refer to Figure 2 , which shows the schematic flow chart of the second method for suppressing the third-order intermodulation distortion signal provided in the embodiments of the present invention. The above step S130 specifically includes the following in this feasible way:

[0068] S131, solve the model coefficients in the third-order intermodulation suppression model based on the least squares method to obtain the target coefficients.

[0069] That is to say, in the embodiments of the present invention, the least squares method will be used to complete the solution of the model coefficients to ensure the effectiveness of the model coefficients.

[0070] Step S140, before the next satisfaction of the distortion suppression condition, substitute the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, and invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the RF power amplifier circuit.

[0071] That is to say, after substituting the target coefficients and the latest original input signal into the aforementioned third-order intermodulation suppression model in the embodiments of the present invention, the predicted value of the third-order intermodulation signal (i.e., the output result) is obtained; then the predicted value of the third-order intermodulation signal is inverted to obtain the third-order intermodulation suppression signal; subsequently, the third-order intermodulation suppression signal and the latest original input signal are synthesized at the same frequency to obtain a synthesized signal; finally, the synthesized signal is used as the input of the RF power amplifier circuit, thereby completing the suppression of the third-order intermodulation distortion signal of the RF power amplifier circuit. To better illustrate the advantages of the embodiments of the present invention, please refer to Figure 4, showing a schematic diagram of the signal simulation result provided by the embodiment of the present invention. Among them, the line segment corresponding to the "original signal" represents the original input signal of the radio frequency power amplifier circuit, and the line segment corresponding to the "PA direct output" in the figure represents the situation where the radio frequency power amplifier circuit does not adopt the third-order intermodulation suppression method provided by the embodiment of the present invention, and the line segment corresponding to the "this simulation result" represents the situation where the radio frequency power amplifier circuit adopts the third-order intermodulation suppression method provided by the embodiment of the present invention. It is not difficult to find that in Figure 4 , compared with the line segment corresponding to the "PA direct output", the power of the line segment corresponding to the "this simulation result" at the third-order intermodulation frequency is significantly suppressed.

[0072] It is not difficult to think that the basis function in the embodiment of the present invention represents the original signal parameters, and the model coefficients can be used to characterize the gain characteristics and phase shift characteristics of the radio frequency power amplifier circuit. And the amplitudes of the gain characteristics and phase shift characteristics changing with time are relatively small, so the interval between the satisfactions of the distortion suppression conditions in the previous and subsequent times is relatively long, which makes the next execution of step S110 after a relatively long time interval. Therefore, the embodiment of the present invention does not need to extract the feedback signal frequently, that is, the signal feedback bandwidth is small.

[0073] Based on this, the embodiment of the present invention enables the suppression process of the third-order intermodulation distortion signal to be completed without a relatively high signal feedback bandwidth, reducing the sampling requirements of the feedback circuit; and, because the embodiment of the present invention can achieve the third-order intermodulation suppression only by introducing a feedback circuit in hardware, and the suppression of the third-order intermodulation distortion signal can be achieved only based on the calculation results of the original input signal and the model coefficients, reducing the distortion suppression cost and being able to efficiently complete the suppression of the third-order intermodulation distortion signal.

[0074] Optionally, in a feasible manner provided by the embodiment of the present invention, specifically, reference can be made to Figure 3 , showing a schematic flowchart of the third method for suppressing the third-order intermodulation distortion signal provided by the embodiment of the present invention. In this feasible manner, the method for suppressing the third-order intermodulation distortion signal provided by the embodiment of the present invention further includes:

[0075] Step S150, based on the feedback circuit, obtain the signal power of the third-order intermodulation signal corresponding to each of the original input signals.

[0076] Furthermore, the above step S110 specifically includes in this feasible manner:

[0077] S111, if the signal power reaches a preset power, obtain the original input signal with a preset bandwidth, and obtain the third-order intermodulation signal corresponding to the original input signal based on the feedback circuit.

[0078] Furthermore, the above step S140 specifically includes in this feasible manner:

[0079] S141. Before the signal power reaches the preset power next time at the said signal power, substitute the target coefficient and the latest original input signal into the said third-order intermodulation suppression model to obtain an output result, invert the said output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the said latest original input signal to obtain the input signal of the said radio frequency power amplifier circuit.

[0080] That is, the embodiment of the present invention determines whether there are significant changes in the power amplifier characteristics (i.e., gain characteristics and phase shift characteristics) in the radio frequency power amplifier circuit based on the signal power of the feedback signal (i.e., the third-order intermodulation signal). Specifically, if the model coefficient is solved at the current moment and the suppression of the third-order intermodulation distortion signal is completed using the model coefficient, the signal power of the third-order intermodulation signal collected by the feedback circuit at the current moment should be low and lower than the preset power. After a period of time, as the radio frequency power amplifier circuit operates, its power amplifier characteristics change accordingly, and thus the previously solved model coefficient cannot correctly represent the power amplifier characteristics at the current moment, resulting in a decrease in the suppression effect of the third-order intermodulation distortion signal over time and causing the signal power of the third-order intermodulation signal to rise to the preset power over time.

[0081] Therefore, the embodiment of the present invention enables the model coefficient to be adaptively updated when the power amplifier characteristics change significantly, thereby achieving persistent suppression of the third-order intermodulation distortion signal.

[0082] To better illustrate the solution process of the foregoing third-order intermodulation suppression model provided by the embodiment of the present invention, a brief description is given here as follows.

[0083]

[0084] After collecting L third-order intermodulation signals corresponding to L original input signals and constructing the above two models, the above two models are transformed into matrix form to obtain the following formula:

[0085] Y IDM3_L =Y XL B L

[0086] Y IDM3_U =V XU B U

[0087] Where:

[0088] Y IDM3_L =[y IDM3_L (1),y IDM3_L (2),…y IDM3_L (L)] T

[0089] B L =[blk,q , bl k,q , … bl k,q T

[0090]

[0091] It is not difficult to understand that the above u XL (n) k,q is a lower sideband basis function sequence composed of a low-frequency signal x L and a high-frequency signal x U . It can be understood that since the upper sideband basis function sequence is similar to the lower sideband basis function sequence and has the same construction method, the description here is omitted.

[0092] Based on the L third-order intermodulation signals corresponding to the determined L original input signals, solve the above two matrix-form third-order intermodulation suppression models to obtain the target coefficients and That is:

[0093]

[0094] Thus, after obtaining the latest original input signals x' L and x' U , use x' L and x' U to construct new basis functions V X′L and basis function V X′U .

[0095] Then, substitute the basis function V X′L and the basis function V X′U as well as the target coefficients and into the matrix form of the aforementioned third-order intermodulation suppression model, and then obtain the corresponding model output results Z IDM3_L and Z IDM3_U , that is:

[0096]

[0097] Subsequently, invert Z IDM3_L to obtain the corresponding third-order intermodulation suppression signal Invert Z IDM3_U to obtain the corresponding third-order intermodulation suppression signal

[0098] Finally, perform co-frequency synthesis on x' L , x' U , and to obtain the latest input signal of the RF power amplifier circuit ​

[0099] Embodiment 2

[0100] Corresponding to the method for suppressing third-order intermodulation distortion signals provided in Embodiment 1 of the present invention, Embodiment 2 of the present invention further provides a device for suppressing third-order intermodulation distortion signals. Referring to Figure 5 , a schematic structural diagram of the device for suppressing third-order intermodulation distortion signals provided in the embodiments of the present invention is shown. The device 200 for suppressing third-order intermodulation distortion signals provided in the embodiments of the present invention includes:

[0101] An acquisition module 210, configured to acquire an original input signal with a preset bandwidth of a radio frequency power amplifier circuit when a preset distortion suppression condition is satisfied, and acquire a third-order intermodulation signal corresponding to the original input signal based on a feedback circuit, where the radio frequency power amplifier circuit and the feedback circuit are electrically connected;

[0102] A construction module 220, configured to construct a third-order intermodulation suppression model based on the original input signal and the third-order intermodulation signal, where the third-order intermodulation suppression model is used to describe the third-order intermodulation distortion characteristics of the radio frequency power amplifier circuit, the output parameter of the third-order intermodulation suppression model is the third-order intermodulation signal, and the input parameters include basis functions and model coefficients, and the basis functions are constituted by the original input signals;

[0103] A solving module 230, configured to solve the model coefficients in the third-order intermodulation suppression model to obtain target coefficients;

[0104] An input module 240, configured to substitute the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result before the next distortion suppression condition is satisfied, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal and the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit.

[0105] Optionally, in a feasible manner provided in the embodiments of the present invention, it further includes:

[0106] A power acquisition module, configured to acquire the signal power of the third-order intermodulation signal corresponding to each original input signal based on the feedback circuit;

[0107] The acquisition module is further configured to acquire an original input signal with a preset bandwidth and acquire a third-order intermodulation signal corresponding to the original input signal based on the feedback circuit if the signal power reaches a preset power;

[0108] The input module is further configured to substitute the target coefficient and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the RF power amplifier circuit.

[0109] Optionally, in a feasible manner provided by an embodiment of the present invention, the solving module is further configured to solve the model coefficients in the third-order intermodulation suppression model based on the least squares method to obtain the target coefficient.

[0110] Optionally, in a feasible manner provided by an embodiment of the present invention, the original input signal includes a high-frequency signal and a low-frequency signal with different signal center frequencies, the third-order intermodulation signal includes a lower-band third-order intermodulation signal and an upper-band third-order intermodulation signal, and the third-order intermodulation suppression model includes:

[0111]

[0112] In the formula, y IMD3_L (n) represents the nth lower-band third-order intermodulation signal, y IMD3_U (n) represents the nth upper-band third-order intermodulation signal, and the value range of n is [1, 2,..., L] T , L represents the number of signals of the original input signal within the preset bandwidth, bl k，q and bu k，q both represent model coefficients, and both represent basis functions, x U and x L respectively represent the high-frequency signal and the low-frequency signal, x U * and x L * respectively represent the conjugate signal of the high-frequency signal and the conjugate signal of the low-frequency signal, K is the memory depth, and Q is the nonlinear order.

[0113] The third-order intermodulation distortion signal suppression device 200 provided by the embodiments of the present application can implement each process of the third-order intermodulation distortion signal suppression method corresponding to Embodiment 1 and achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0114] An embodiment of the present invention further provides a computer device, including a memory and a processor. The memory stores a computer program, and when the computer program runs on the processor, it executes the third-order intermodulation distortion signal suppression method described in Embodiment 1.

[0115] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program runs on a processor, it executes the method for suppressing third-order intermodulation distortion signals as described in Embodiment 1.

[0116] In several embodiments provided by the present application, it should be understood that the disclosed device and method can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and structure diagrams in the drawings show the possible architectures, functions, and operations of the device, method, and computer program product according to multiple embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in an alternative implementation, the functions marked in the block may occur in a different order from that marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the structure diagram and / or flowchart, as well as the combination of blocks in the structure diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0117] In addition, in each embodiment of the present invention, the various functional modules or units may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0118] If the above functions are implemented in the form of software functional modules and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0119] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A method for suppressing third-order intermodulation distortion signals, characterized in that, Including: When a preset distortion suppression condition is satisfied, obtain an original input signal with a preset bandwidth of a radio frequency power amplifier circuit, and obtain a third-order intermodulation signal corresponding to the original input signal based on a feedback circuit, where the radio frequency power amplifier circuit and the feedback circuit are electrically connected; Construct a third-order intermodulation suppression model based on the original input signal and the third-order intermodulation signal, where the third-order intermodulation suppression model is used to describe the third-order intermodulation distortion characteristic of the radio frequency power amplifier circuit, the output parameter of the third-order intermodulation suppression model is the third-order intermodulation signal, and the input parameters include basis functions and model coefficients, and the basis functions are composed of the original input signal; Solve the model coefficients in the third-order intermodulation suppression model to obtain target coefficients; Before the next time the distortion suppression condition is satisfied, substitute the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit.

2. The method for suppressing the third-order intermodulation distortion signal according to claim 1, wherein, Also including: Based on the feedback circuit, obtain the signal power of the third-order intermodulation signal corresponding to each original input signal; The step of, when a preset distortion suppression condition is satisfied, obtaining an original input signal with a preset bandwidth and obtaining a third-order intermodulation signal corresponding to the original input signal based on the feedback circuit includes: If the signal power reaches a preset power, obtain an original input signal with a preset bandwidth and obtain a third-order intermodulation signal corresponding to the original input signal based on the feedback circuit; The step of, before the next time the distortion suppression condition is satisfied, substituting the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, inverting the output result to obtain a third-order intermodulation suppression signal, and synthesizing the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit includes: Before the signal power reaches the preset power next time, substitute the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, invert the output result to obtain a third-order intermodulation suppression signal, and synthesize the third-order intermodulation suppression signal with the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit.

3. The method for suppressing the third-order intermodulation distortion signal according to claim 1, wherein The step of solving the model coefficients in the third-order intermodulation suppression model to obtain target coefficients includes: Solve the model coefficients in the third-order intermodulation suppression model based on the least squares method to obtain target coefficients.

4. The method for suppressing the third-order intermodulation distortion signal according to claim 1, wherein The original input signal includes a high-frequency signal and a low-frequency signal with different signal center frequencies, the third-order intermodulation signal includes a lower-band third-order intermodulation signal and an upper-band third-order intermodulation signal, and the third-order intermodulation suppression model includes: where y IMD3_L (n) represents the n-th lower frequency band third-order intermodulation signal, and y IMD3_U (n) represents the n-th upper frequency band third-order intermodulation signal, and the value range of n is [1, 2, …, L] T , where L represents the number of signals of the original input signal with the preset bandwidth, bl k，q and bu k，q both represent model coefficients, and both represent basis functions, x U and x L respectively represent the high-frequency signal and the low-frequency signal, x U * and x L * respectively represent the conjugate signal of the high-frequency signal and the conjugate signal of the low-frequency signal, K is the memory depth, and Q is the non-linear order.

5. A device for suppressing third-order intermodulation distortion signals, characterized in that, Including: An acquisition module, configured to, when a preset distortion suppression condition is satisfied, obtain an original input signal with a preset bandwidth of a radio frequency power amplifier circuit, and obtain a third-order intermodulation signal corresponding to the original input signal based on a feedback circuit, where the radio frequency power amplifier circuit and the feedback circuit are electrically connected; A building block for constructing a third-order intermodulation suppression model based on the original input signal and the third-order intermodulation signal, wherein the third-order intermodulation suppression model is used to describe the third-order intermodulation distortion characteristics of a radio frequency power amplifier circuit, the output parameter of the third-order intermodulation suppression model is the third-order intermodulation signal, and the input parameters include basis functions and model coefficients, and the basis functions are constituted by the original input signal; A solving module for solving the model coefficients in the third-order intermodulation suppression model to obtain target coefficients; An input module for substituting the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result before the next satisfaction of the distortion suppression condition, inverting the output result to obtain a third-order intermodulation suppression signal, and synthesizing the third-order intermodulation suppression signal and the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit.

6. The suppression device for the third-order intermodulation distortion signal according to claim 5, characterized in that, It further includes: A power acquisition module for acquiring the signal power of the third-order intermodulation signal corresponding to each original input signal based on the feedback circuit; The acquisition module is further configured to, if the signal power reaches a preset power, acquire the original input signal within a preset bandwidth and acquire the third-order intermodulation signal corresponding to the original input signal based on the feedback circuit; The input module is further configured to, before the signal power reaches the preset power next time, substitute the target coefficients and the latest original input signal into the third-order intermodulation suppression model to obtain an output result, inverting the output result to obtain a third-order intermodulation suppression signal, and synthesizing the third-order intermodulation suppression signal and the latest original input signal to obtain the input signal of the radio frequency power amplifier circuit.

7. The suppression device for third-order intermodulation distortion signals according to claim 5, characterized in that The solving module is further configured to solve the model coefficients in the third-order intermodulation suppression model based on the least squares method to obtain target coefficients.

8. The suppression device for third-order intermodulation distortion signals according to claim 5, wherein, The original input signal includes a high-frequency signal and a low-frequency signal with different signal center frequencies, the third-order intermodulation signal includes a lower-band third-order intermodulation signal and an upper-band third-order intermodulation signal, and the third-order intermodulation suppression model includes: where y IMD3_L (n) represents the nth lower - band third - order inter - modulation signal, and y IMD3_U (n) represents the nth upper - band third - order inter - modulation signal, and the value range of n is [1, 2, …, L] T , L represents the number of signals of the original input signal of the preset bandwidth, bl k，q and bu k，q both represent model coefficients, and both represent basis functions, x U and x L represent the high - frequency signal and the low - frequency signal respectively, x U * and x L * represent the conjugate signal of the high - frequency signal and the conjugate signal of the low - frequency signal respectively. K is the memory depth, and Q is the non - linear order.

9. A computer device, characterized in that, It includes a memory and a processor, the memory stores a computer program, and when the computer program runs on the processor, it executes the method for suppressing the third-order intermodulation distortion signal according to any one of claims 1-4.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program runs on the processor, it executes the method for suppressing the third-order intermodulation distortion signal according to any one of claims 1-4.

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