Harmonic signal suppression device and wireless communication equipment

Abstract

The embodiment of the utility model relates to the technical field of wireless communication, and discloses a harmonic signal suppression device and wireless communication equipment. The device comprises a radio frequency excitation source, a harmonic suppression excitation source and a power amplifier which is respectively connected with the radio frequency excitation source and the harmonic suppression excitation source, the radio frequency excitation source is used for generating an excitation signal; the power amplifier is used for performing power amplification on the excitation signal to output a power amplification signal, and the power amplification signal comprises an interference harmonic signal; the harmonic suppression excitation source is used for generating a modulation harmonic signal according to the interference harmonic signal, the amplitude of the modulation harmonic signal is linearly related to the amplitude of the interference harmonic signal, and the phase of the modulation harmonic signal is opposite to the phase of the interference harmonic signal; an excitation signal generated by a radio frequency excitation source and a modulation harmonic signal generated by a harmonic suppression excitation source are jointly input into a power amplifier, so that the modulation harmonic signal counteracts an interference harmonic signal contained in a power amplification signal.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless communication technology, and in particular to a harmonic signal suppression device and a wireless communication device. Background Art

[0002] In the process of wireless communication, due to the nonlinear characteristics of the power amplifier, the radio frequency signal transmitted into the wireless channel often contains harmonic signals that are difficult to completely eliminate. The frequencies of harmonic signals of different orders are integer multiples of the effective transmission signal frequency, and the amplitude is directly related to the nonlinear degree of the power amplifier design. The existence of harmonic signals will not only waste the output power of the power amplifier and reduce the working efficiency of the wireless communication transmission equipment, but also interfere with the normal operation of other local wireless communication equipment. At the same time, it will inevitably send the signal to be transmitted to other communication frequency bands, causing information leakage in the wireless communication process.

[0003] Building a harmonic filter through analog circuits is a common technology for solving the above-mentioned harmonic signal problem. In view of the fact that the frequency of harmonic signals is higher than the frequency of useful signals, a low-pass filter can be designed and placed in the post-stage of the power amplifier to filter out harmonic signals. Since this low-pass filter usually uses analog circuits to build parameters and cannot be modified, it can only be normally effective for a specific frequency range after the filter design is completed. In the case where the frequency of the useful signal exceeds the passband range of the low-pass filter or the frequency of the harmonic signal is still within the passband range, this low-pass filter will not work. The usual way to deal with it is to design a group of low-pass filters with different parameters and use the corresponding low-pass filter according to the working frequency of the useful signal. Since this low-pass filter is placed in the post-stage of the power amplifier, the harmonic filter must be able to safely carry the full output power of the power amplifier, and the energy of the filtered harmonic signal will remain in the filter circuit in the form of heat. Therefore, the design of the harmonic filter must consider the power carrying and heat dissipation capabilities of the actual circuit components.

[0004] As mentioned above, in scenarios where multi-band wireless communication is required, especially across multiple frequency multiples, multiple low-pass filter circuits must be built, which will undoubtedly affect the cost of the equipment. At the same time, if the power of wireless communication is large, more expensive high-power carrying devices (such devices are often larger in size) must be selected for circuit design, further raising the cost of the equipment. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a harmonic signal suppression device and a wireless communication device, which can reduce the equipment cost of harmonic suppression.

[0006] In order to solve the above technical problems, an embodiment of the present application provides a device for suppressing harmonic signals, the device comprising: a radio frequency excitation source, a harmonic suppression excitation source, and a power amplifier connected to the radio frequency excitation source and the harmonic suppression excitation source respectively;

[0007] The radio frequency excitation source is used to generate an excitation signal;

[0008] The power amplifier is used to amplify the power of the excitation signal to output a power amplified signal, wherein the power amplified signal includes an interfering harmonic signal;

[0009] The harmonic suppression excitation source is used to generate a modulated harmonic signal according to the interfering harmonic signal, the amplitude of the modulated harmonic signal is linearly related to the amplitude of the interfering harmonic signal, and the phase of the modulated harmonic signal is opposite to the phase of the interfering harmonic signal;

[0010] The excitation signal generated by the radio frequency excitation source and the modulated harmonic signal generated by the harmonic suppression excitation source are input into the power amplifier together, so that the modulated harmonic signal cancels out the interfering harmonic signal contained in the power amplified signal.

[0011] In some optional embodiments, the order of the interfering harmonic signal is N, and the harmonic suppression excitation source includes at least N harmonic suppression generators, where N≥2;

[0012] Different harmonic suppression generators are used to generate modulated harmonic signals corresponding to interference harmonic signals of different orders; wherein the amplitude of the modulated harmonic signal of each order is linearly related to the amplitude of the interference harmonic signal of the corresponding order, and the phase of the modulated harmonic signal of each order is opposite to the phase of the interference harmonic signal of the corresponding order, so that the modulated harmonic signals of different orders cancel out the interference harmonic signals of the corresponding order.

[0013] In some optional embodiments, at least N of the harmonic suppression generators are further used to sequentially generate modulated harmonic signals corresponding to interference harmonic signals of different orders based on the principle that the orders of the interference harmonic signals are from low to high.

[0014] In some optional embodiments, the number of the harmonic suppression generators is N+2.

[0015] In some optional embodiments, the device further comprises: a control unit connected to the radio frequency excitation source and the harmonic suppression excitation source respectively;

[0016] The control unit is used to set the design parameters of the RF excitation source and the harmonic suppression excitation source respectively, so that the RF excitation source and the harmonic suppression excitation source generate excitation signals and modulated harmonic signals according to the corresponding design parameters respectively, and the design parameters include frequency, amplitude and phase.

[0017] In some optional embodiments, the device further comprises: a directional coupler connected to the power amplifier and the control unit respectively;

[0018] The directional coupler is used to feed back the magnitude of the power amplified signal output by the power amplifier to the control unit according to a preset ratio, and the amplitude and phase of the power amplified signal of the preset ratio are the same as the amplitude and phase of the power amplified signal;

[0019] The control unit is also used to set the amplitude and phase of the harmonic suppression excitation source according to the amplitude and phase of the power amplification signal of the preset ratio, so that the harmonic suppression excitation source generates a modulated harmonic signal according to the set amplitude and phase.

[0020] An embodiment of the present application further provides a wireless communication device, comprising the above-mentioned harmonic signal suppression device.

[0021] The harmonic signal suppression device provided in the embodiments of the present application has at least the following beneficial effects:

[0022] In the present application, when eliminating the harmonic signal (i.e., the interfering harmonic signal) generated after the power amplifier amplifies the excitation signal, the device used abandons the harmonic filter and sets a harmonic suppression excitation source for generating a modulated harmonic signal. The modulated harmonic signal is generated specifically according to the amplitude and phase of the interfering harmonic signal contained in the signal output by the power amplifier, so that the amplitude of the modulated harmonic signal is linearly related to the amplitude of the harmonic signal, and the phase of the modulated harmonic signal is opposite to the phase of the harmonic signal. Therefore, the excitation signal and the modulated harmonic signal can be input into the power amplifier together, so that the modulated harmonic signal cancels out the interfering harmonic signal contained in the power amplified signal, thereby avoiding the interfering harmonic signal from interfering with the operation of the wireless communication device. Moreover, the device for achieving harmonic signal suppression - the harmonic suppression excitation source is set in the front stage of the power amplifier, which can completely avoid the use of electronic components with large power capacity and large volume, thereby effectively reducing the cost and volume of the wireless communication device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by the pictures in the corresponding drawings, and these exemplary descriptions do not constitute limitations on the embodiments.

[0024] Figure 1The structure of a harmonic signal suppression device provided according to an embodiment of the present application is schematically shown. Figure 1 ;

[0025] Figure 2 is a control logic flow chart of a harmonic suppression excitation source provided according to an embodiment of the present application;

[0026] Figure 3 The structure of a harmonic signal suppression device provided according to an embodiment of the present application is schematically shown. Figure 2 ;

[0027] Figure 4 The structure diagram of an existing harmonic signal suppression solution is shown in FIG. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0029] An embodiment of the present application relates to a harmonic signal suppression device. The implementation details of the harmonic signal suppression device of this embodiment are specifically described below. The following content is only the implementation details provided for the convenience of understanding and is not necessary for implementing this solution.

[0030] The specific structure of the harmonic signal suppression device of this embodiment can be as follows: Figure 1 As shown, it includes: a radio frequency excitation source 10, a harmonic suppression excitation source 11, and a power amplifier 12 connected to the radio frequency excitation source 10 and the harmonic suppression excitation source 11 respectively. Among them, the radio frequency excitation source 10 is used to generate an excitation signal, and the power amplifier 12 is used to amplify the power of the excitation signal to output a power amplified signal containing a harmonic signal. And it is used to generate a modulated harmonic signal according to the interference harmonic signal, and the amplitude of the modulated harmonic signal is linearly related to the amplitude of the interference harmonic signal, and the phase is opposite to the phase of the interference harmonic signal. At this time, by inputting the excitation signal generated by the radio frequency excitation source and the modulated harmonic signal generated by the harmonic suppression excitation source into the power amplifier together, the modulated harmonic signal can offset the interference harmonic signal contained in the power amplified signal.

[0031] Specifically, when the harmonic signal suppression device is working, the excitation signal is first generated by the RF excitation source 10 according to the established transmission process. For example, the RF excitation source 10 emits an excitation signal of a fixed frequency according to the set working parameters, and at the same time, a modulated harmonic signal is generated by the harmonic suppression excitation source 11, and the frequency of the modulated harmonic signal generated by the harmonic suppression excitation source 11 is an integer multiple of the excitation signal frequency, and the amplitude and phase are set to 0. The excitation signal and the modulated harmonic signal will be sent to the power amplifier 12 for power amplification, and finally a power amplified signal containing an interfering harmonic signal is output. Among them, setting the amplitude of the modulated harmonic signal to 0 means that the modulated harmonic signal is not output, so as to obtain a power amplified signal (including the initial interfering harmonic signal) after the excitation signal is power amplified. In order to prevent the harmonic signal from interfering with the operation of the wireless communication device, it is necessary to suppress the interfering harmonic signal. Therefore, in this embodiment, the harmonic suppression excitation source 11 will adjust the modulated harmonic signal generated according to the harmonic signal. The adjustment direction is: the amplitude of the modulated harmonic signal is linearly related to the amplitude of the interfering harmonic signal, and the phase of the modulated harmonic signal is opposite to the phase of the interfering harmonic signal. In this way, the interfering harmonic signal contained in the power amplification signal can be offset by the adjusted modulated harmonic signal.

[0032] In a specific implementation, the order of the interference harmonic signal is N, and the harmonic suppression excitation source includes at least N harmonic suppression generators, and N ≥ 2. Different harmonic suppression generators are used to generate modulated harmonic signals corresponding to interference harmonic signals of different orders; wherein the amplitude of the modulated harmonic signal of each order is linearly related to the amplitude of the interference harmonic signal of the corresponding order, and the phase of the modulated harmonic signal of each order is opposite to the phase of the interference harmonic signal of the corresponding order, so that the modulated harmonic signals of different orders cancel out the interference harmonic signals of the corresponding order.

[0033] Specifically, the RF excitation source 10 first generates an excitation signal according to the set working parameters and then sends it to the power amplifier. Due to the nonlinear characteristics of the power amplifier, the output signal of the power amplifier 12 (i.e., the power amplified signal) contains interference harmonic signals of different orders. For example, the order of the interference harmonic signal is N, and N ≥ 2, that is, the interference harmonic signal contains at least a 2nd order harmonic signal. At this time, continue to refer to Figure 1The harmonic suppression excitation source 11 includes at least N harmonic suppression generators, and different harmonic suppression generators are used to generate modulated harmonic signals corresponding to interference harmonic signals of different orders, and adjust the modulated harmonic signals of corresponding orders according to the interference harmonic signals of different orders, so that the amplitude of each order of modulated harmonic signals is linearly related to the amplitude of the corresponding order of interference harmonic signals, and the phase of each order of modulated harmonic signals is opposite to the phase of the corresponding order of interference harmonic signals, so as to offset the interference harmonic signals of corresponding orders through the adjusted modulated harmonic signals of different orders. In other words, one harmonic suppression generator corresponds to an interference harmonic signal of one order, for example, the harmonic suppression generator 1 corresponds to a second-order interference harmonic signal, and is used to generate a modulated harmonic signal that offsets the second-order harmonic signal.

[0034] In an example, when the at least N harmonic suppression generators adjust the modulated harmonic signals corresponding to the interference harmonic signals of different orders according to the interference harmonic signals of different orders, considering that the modulated harmonic signal input to the power amplifier 12 will further generate a new interference harmonic signal of a higher frequency without affecting the lower frequency, in this embodiment, at least N harmonic suppression generators are selected to generate modulated harmonic signals corresponding to the interference harmonic signals of different orders in sequence based on the principle of the order of the interference harmonic signal from low to high, that is, the modulated harmonic signals of different orders are adjusted in sequence.

[0035] As described above, at least N harmonic suppression generators adjust the modulated harmonic signal by adjusting the amplitude and phase of the modulated harmonic signal. Therefore, this embodiment shows the specific process of how at least N harmonic suppression generators included in the harmonic suppression excitation source 11 adjust the modulated harmonic signals corresponding to the interference harmonic signals of different orders according to the amplitude and phase of the interference harmonic signals of different orders, such as Figure 2 As shown: At the beginning, the amplitude and phase of all modulated harmonic signals are 0. First, the amplitude and phase of the second-order interference harmonic signal are analyzed, and then the amplitude and phase of the modulated harmonic signal 1 generated by the harmonic suppression generator 1 are adjusted, so that the amplitude of the modulated harmonic signal 1 is linearly related to the amplitude of the second-order interference harmonic signal, and the phase of the modulated harmonic signal 1 is opposite to the phase of the second-order interference harmonic signal, thereby completing the adjustment of the modulated harmonic signal 1. Then, it is determined whether the amplitude and phase of the second-order interference harmonic signal meet the system performance requirements, that is, whether the second-order interference harmonic signal is offset by the modulated harmonic signal 1. If so, the next step is entered, that is, the adjustment of the third-order interference harmonic signal. The adjustment method is the same as the adjustment method of the second-order interference harmonic signal, which will not be repeated here, until the N-order interference harmonic signal is adjusted, and the N-order interference harmonic signal meets the system performance requirements, that is, the suppression process of the interference harmonic signal contained in the power amplification signal is completed.

[0036] In one example, the number of harmonic suppression generators in the harmonic suppression excitation source 11 is related to the nonlinearity of the power amplifier 12 and the performance requirements of the system design. Specifically, if the N-order interference harmonic signal of the original power amplifier 12 is small enough to meet the performance requirements of the system design, the number of harmonic suppression generators in the harmonic suppression excitation source 11 can be designed to be N. However, considering that the design of system performance should retain some margin to avoid the instability caused by changes in the system working environment causing the deterioration of system performance, it is necessary to add 2 more harmonic suppression generators according to actual engineering experience. Therefore, when the order of the interference harmonic signal is N, the number of harmonic suppression generators can be set to N+2.

[0037] In some embodiments, the specific structure of the harmonic signal suppression device of the embodiment of the present application can be as follows: Figure 3 As shown, on the basis of the above embodiment, a control unit 13 is respectively connected to the RF excitation source 10 (i.e., the excitation source in the figure) and the harmonic suppression excitation source 11, and a directional coupler 14 is respectively connected to the power amplifier 12 and the control unit 13. The specific contents of the RF excitation source 10, the harmonic suppression excitation source 11, and the power amplifier 12 can be referred to the above embodiment, and will not be repeated here.

[0038] The control unit 13 is used to set the design parameters of the RF excitation source 10 and the harmonic suppression excitation source 11 respectively, so that the RF excitation source 10 and the harmonic suppression excitation source 11 generate an excitation signal and a modulated harmonic signal according to the corresponding design parameters, and the design parameters include frequency, amplitude and phase. That is, the control unit 13 can control the RF excitation source 10 to generate an excitation signal with a preset frequency, amplitude and phase, and control the harmonic suppression excitation source 11 to generate a modulated harmonic signal with a preset frequency, amplitude and phase. After the excitation signal and the modulated harmonic signal enter the power amplifier 12 for power amplification, the power amplifier 12 outputs a power amplified signal containing an interference harmonic signal, and then the power amplified signal containing the interference harmonic signal can be directly fed back to the control unit 13, and the control unit 13 can control the harmonic suppression excitation source 11 to generate a modulated harmonic signal that is linearly related to the amplitude of the interference harmonic signal and has an opposite phase according to the amplitude and phase of the interference harmonic signal to offset the harmonic signal.

[0039] It can be understood that the control unit 13 is pre-set with harmonic signal analysis software in the form of software. After receiving the feedback power amplification signal, the amplitude and phase of the interfering harmonic signal can be analyzed by the harmonic signal analysis software. However, how the harmonic signal analysis software specifically analyzes the amplitude and phase of the interfering harmonic signal is not the core point of the embodiments of the present application and will not be repeated here.

[0040] The directional coupler 14 is used to feed back the size of the power amplified signal output by the power amplifier 12 to the control unit 13 according to a preset ratio, and the amplitude and phase of the power amplified signal of the preset ratio are the same as the amplitude and phase of the power amplified signal. At this time, the control unit 13 is also used to set the amplitude and phase of the harmonic suppression excitation source 11 according to the amplitude and phase of the power amplified signal of the preset ratio, so that the harmonic suppression excitation source 11 generates a modulated harmonic signal according to the set amplitude and phase (that is, according to the amplitude and phase of the modulated harmonic signal). Since the power amplified signal output by the power amplifier 12 is too large, the power amplified signal actually fed back to the control unit 13 is a preset ratio of the original power amplified signal. For example, the power amplified signal is 100W, and the power amplified signal fed back to the control unit 13 is only 0.1W, that is, the preset ratio is 0.1%, but the amplitude and phase of this 0.1W power amplified signal are the same as the amplitude and phase of the original power amplified signal, so as to ensure that the modulated harmonic signal adjusted according to the power amplified signal can offset the interfering harmonic signal in the power amplified signal.

[0041] The preset ratio is determined according to the output power of the wireless communication device where the harmonic signal suppression device is located. For example, if the output power of the wireless communication device is 100W, the preset ratio can be set to 0.1%.

[0042] It should be noted that the directional coupler 14 is used to feed back the magnitude of the power amplified signal output by the power amplifier 12 to the control unit 13 according to a preset ratio, and the other power amplified signal is sent to the control unit 13. Figure 3 In the transmitting antenna 15 shown.

[0043] In a specific implementation, the harmonic signal suppression device of this embodiment also includes a multi-channel signal combiner 16 respectively connected to the RF excitation source 10, the harmonic suppression excitation source 11 and the power amplifier 12. The multi-channel signal combiner 16 can combine the excitation signals and modulated harmonic signals generated by the RF excitation source 10 and the harmonic suppression excitation source 11, and then input them into the power amplifier 12.

[0044] In a specific example, when the harmonic signal suppression device of this embodiment is working, the control unit 13 is first used to set the frequencies of the modulated harmonic signals of each order in the harmonic suppression excitation source 11 to be integer multiples of the excitation signal frequency, and the amplitude and phase are set to 0. The RF excitation source 10 generates an excitation signal according to a predetermined signal transmission process, and the multi-channel signal combiner 12 sends its output signal to the power amplifier 12. The power amplifier 12 amplifies the input signal, and the output signal of the power amplifier 12 is sent to the transmitting antenna 15 through the directional coupler 14. At the same time, the directional coupler 14 converts the output signal of the power amplifier 12 into an integer multiple of the excitation signal frequency. The harmonic signal analysis software in the control unit 13 analyzes the amplitude and phase of the interference harmonic signals of each order contained in the output signal of the power amplifier 12, and adjusts the amplitude and phase of the modulated harmonic signals of each order in the harmonic suppression excitation source 11 in turn according to the harmonic signal analysis result, wherein the amplitude of the modulated harmonic signal is linearly related to the amplitude of the interference harmonic signal of the corresponding order in the feedback signal, and the phase is opposite to the phase of the interference harmonic signal of the corresponding order in the feedback signal, so that the interference harmonic signal contained in the output signal of the power amplifier 12 is fully offset.

[0045] Figure 4 A schematic diagram of the structure of an existing harmonic signal suppression solution is shown (the excitation source in the figure is the RF excitation source 10 described in the embodiment of the present application), which converts the low-pass filter (i.e. Figure 4 The harmonic filter in the power amplifier is placed after the power amplifier to filter out interfering harmonic signals. In scenarios where multi-band wireless communication is required, especially across multiple frequency multiples, multiple low-pass filter circuits must be built, which will undoubtedly affect the cost of the equipment. At the same time, if the power of wireless communication is large, more expensive high-power load-bearing devices (such devices are often larger in size) must be selected for circuit design, which will not only further increase the cost of the equipment, but also hinder the miniaturization design of the equipment.

[0046] In the embodiment of the present application, when eliminating the harmonic signal (i.e., the interfering harmonic signal) generated after the power amplifier amplifies the excitation signal, the device used abandons the harmonic filter, but sets a harmonic suppression excitation source for generating a modulated harmonic signal, and the modulated harmonic signal is specifically generated according to the amplitude and phase of the interfering harmonic signal contained in the signal output by the power amplifier, so that the amplitude of the modulated harmonic signal is linearly related to the amplitude of the harmonic signal, and the phase of the modulated harmonic signal is opposite to the phase of the harmonic signal, so that the excitation signal and the modulated harmonic signal can be input into the power amplifier together, so that the modulated harmonic signal cancels the interfering harmonic signal contained in the power amplified signal, thereby avoiding the interfering harmonic signal from interfering with the operation of the wireless communication device. In addition, the device for achieving harmonic signal suppression - the harmonic suppression excitation source is set in the front stage of the power amplifier, which can completely avoid the use of electronic components with large power capacity and large volume, thereby effectively reducing the cost and volume of the wireless communication device.

[0047] Another embodiment of the present application relates to a wireless communication device. The wireless communication device of this embodiment includes the harmonic signal suppression device described in any of the above embodiments.

[0048] It is not difficult to find that this embodiment is a device embodiment corresponding to the above method embodiment, and this embodiment can be implemented in conjunction with the above method embodiment. The relevant technical details and technical effects mentioned in the above embodiment are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied in the above embodiment.

[0049] Those skilled in the art can understand that the above embodiments are specific embodiments for implementing the present disclosure, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure, so the protection scope of the embodiments of the present disclosure shall be based on the scope defined in the claims.

Claims

1. A device for suppressing harmonic signals, characterized in that: The device comprises: a radio frequency excitation source, a harmonic suppression excitation source, and a power amplifier connected to the radio frequency excitation source and the harmonic suppression excitation source respectively; The radio frequency excitation source is used to generate an excitation signal; The power amplifier is used to amplify the power of the excitation signal to output a power amplified signal, wherein the power amplified signal includes an interfering harmonic signal; The harmonic suppression excitation source is used to generate a modulated harmonic signal according to the interfering harmonic signal, the amplitude of the modulated harmonic signal is linearly related to the amplitude of the interfering harmonic signal, and the phase of the modulated harmonic signal is opposite to the phase of the interfering harmonic signal; The excitation signal generated by the radio frequency excitation source and the modulated harmonic signal generated by the harmonic suppression excitation source are input into the power amplifier together, so that the modulated harmonic signal cancels out the interfering harmonic signal contained in the power amplified signal.

2. The harmonic signal suppression device according to claim 1, characterized in that: The order of the interfering harmonic signal is N, and the harmonic suppression excitation source includes at least N harmonic suppression generators, N≥2; Different harmonic suppression generators are used to generate modulated harmonic signals corresponding to interference harmonic signals of different orders; wherein the amplitude of the modulated harmonic signal of each order is linearly related to the amplitude of the interference harmonic signal of the corresponding order, and the phase of the modulated harmonic signal of each order is opposite to the phase of the interference harmonic signal of the corresponding order, so that the modulated harmonic signals of different orders cancel out the interference harmonic signals of the corresponding order.

3. The harmonic signal suppression device according to claim 2, characterized in that: At least N of the harmonic suppression generators are also used to sequentially generate modulated harmonic signals corresponding to interference harmonic signals of different orders based on the principle that the orders of the interference harmonic signals are from low to high.

4. The harmonic signal suppression device according to claim 3, characterized in that: The number of the harmonic suppression generators is N+2.

5. The harmonic signal suppression device according to claim 1, characterized in that: The device further comprises: a control unit connected to the radio frequency excitation source and the harmonic suppression excitation source respectively; The control unit is used to set the design parameters of the RF excitation source and the harmonic suppression excitation source respectively, so that the RF excitation source and the harmonic suppression excitation source generate excitation signals and modulated harmonic signals according to the corresponding design parameters respectively, and the design parameters include frequency, amplitude and phase.

6. The harmonic signal suppression device according to claim 5, characterized in that: The device further comprises: a directional coupler connected to the power amplifier and the control unit respectively; The directional coupler is used to feed back the magnitude of the power amplified signal output by the power amplifier to the control unit according to a preset ratio, and the amplitude and phase of the power amplified signal of the preset ratio are the same as the amplitude and phase of the power amplified signal; The control unit is also used to set the amplitude and phase of the harmonic suppression excitation source according to the amplitude and phase of the power amplification signal of the preset ratio, so that the harmonic suppression excitation source generates a modulated harmonic signal according to the set amplitude and phase.

7. A wireless communication device, characterized in that: The method comprises the device for suppressing harmonic signals as claimed in any one of claims 1 to 6.

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