A method, system, device and medium for reducing high PAPR waveform in radio frequency power amplifier

Abstract

The present invention provides a method, system, device and medium for reducing high PAPR waveforms in radio frequency power amplifiers, the method comprising dividing an input high PAPR waveform into two sub-waveforms with lower PAPR; using two independent radio frequency power amplifiers to respectively amplify the sub-waveforms, wherein the sub-waveform received by the first radio frequency power amplifier is a sub-waveform with a PAPR reduced by 6dB compared with the original waveform, and the second radio frequency power amplifier receives a sub-waveform with a fixed amplitude; synthesizing the amplified sub-waveforms output by the two radio frequency power amplifiers to obtain a synthesized waveform. The present invention can improve the performance of radio frequency power amplifiers, optimize signal transmission, reduce costs, and improve the performance of the overall communication system.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency communication technology, and more specifically, to a method, system, medium and computing device for reducing a high PAPR waveform in a radio frequency power amplifier. Background Art

[0002] In the field of RF communications, high PAPR (Peak-to-Average Power Ratio) waveforms are a long-standing problem. High PAPR waveforms can cause nonlinear distortion in RF power amplifiers, which not only reduces the signal transmission quality but also increases the energy consumption of the system. When processing such waveforms, traditional RF power amplifiers often require a large power back-off to avoid excessive nonlinear distortion, which limits the efficiency and performance of the amplifier.

[0003] In existing technologies, researchers have proposed a variety of methods to reduce PAPR, such as coding, filtering, pre-distortion, digital pre-distortion, etc. However, these methods often have certain limitations, such as complex signal processing algorithms, high computational costs, potential impact on signal quality, or difficulty in achieving ideal PAPR reduction effects in practical applications.

[0004] In the process of implementing the embodiments of the present invention, the inventors found that there are at least the following problems or defects in the prior art: Although the prior art provides some methods to reduce PAPR, they often cannot effectively reduce PAPR without sacrificing signal quality, especially in application scenarios that require high efficiency and high power amplification. In addition, the prior art may require complex hardware support and high energy consumption when processing high PAPR waveforms, which limits their application in energy-constrained environments such as mobile communications and wireless networks. In addition, the existing waveform synthesis technology may have problems of phase inconsistency and amplitude mismatch when synthesizing two sub-waveforms, which will lead to a decrease in the performance of the synthesized waveform. Moreover, for high PAPR waveforms such as orthogonal frequency division multiplexing (OFDM) that are widely used in modern communication systems, the prior art often lacks targeted solutions and is difficult to meet the growing communication needs and the pursuit of high efficiency and high reliability. Summary of the invention

[0005] The present invention provides a method, system, medium and computing device for reducing high PAPR waveform in a radio frequency power amplifier.

[0006] In a first aspect of the present invention, there is provided a method for reducing a high PAPR waveform in a radio frequency power amplifier, comprising:

[0007] Split the input high PAPR waveform into two sub-waveforms with lower PAPR;

[0008] Using two independent radio frequency power amplifiers to amplify the sub-waveforms respectively, wherein the sub-waveform received by the first radio frequency power amplifier is a sub-waveform with a PAPR reduced by 6 dB compared with the original waveform, and the second radio frequency power amplifier receives a sub-waveform with a fixed amplitude;

[0009] The amplified sub-waveforms output by the two radio frequency power amplifiers are synthesized to obtain a synthesized waveform.

[0010] Further, the step of dividing the input high PAPR waveform into two sub-waveforms with lower PAPR comprises:

[0011] The input high PAPR waveform is processed by a waveform folding algorithm to generate the two sub-waveforms with lower PAPR.

[0012] Furthermore, the waveform folding algorithm comprises the following steps:

[0013] A frequency conversion mixer is provided at the transmitting end of the radio frequency power amplifier, and a continuous wave radio frequency signal is generated based on the frequency conversion mixer;

[0014] Using the continuous wave radio frequency signal, the envelope of the input signal is measured through an envelope ranging mechanism, and the envelope is adjusted according to the measurement result to achieve normalization;

[0015] The envelope of the normalized continuous wave radio frequency signal is controlled, the amplitude is increased at the peak value of the continuous wave radio frequency signal, and the amplitude is reduced at the valley value, so as to realize the folding of the waveform.

[0016] Further, increasing the amplitude at the peak value of the signal and reducing the amplitude at the valley value includes:

[0017] The amplitude is increased by 1 / 2 at the peak of the continuous wave RF signal, and is reduced by 1 / 2 at the valley.

[0018] Further, obtaining the synthesized waveform includes:

[0019] A power combiner is configured, and the power combiner receives two sub-waveforms amplified by a high-efficiency radio frequency power amplifier;

[0020] Detecting and locking the phase information of the two sub-waveforms;

[0021] Adjust the phase of each sub-waveform to ensure that the phases of the two sub-waveforms are consistent at the synthesis point;

[0022] The amplitudes of the two sub-waveforms are measured and compared, and the sub-waveform with the smaller amplitude is compensated by the gain control element to ensure that the amplitudes of the two sub-waveforms are consistent.

[0023] Furthermore, the high PAPR waveform includes an orthogonal frequency division multiplexing waveform.

[0024] Furthermore, the PAPR of the synthesized waveform is the same as that of the original waveform.

[0025] In a second aspect of the present invention, there is provided a system for reducing a high PAPR waveform in a radio frequency power amplifier, comprising:

[0026] A segmentation module, for segmenting an input high PAPR waveform into two sub-waveforms with lower PAPR;

[0027] an amplification module, configured to respectively amplify the sub-waveforms using two independent radio frequency power amplifiers, wherein the sub-waveform received by the first radio frequency power amplifier is a sub-waveform with a PAPR reduced by 6 dB compared with the original waveform, and the second radio frequency power amplifier receives a sub-waveform with a fixed amplitude;

[0028] The synthesis module is used to synthesize the amplified sub-waveforms output by the two radio frequency power amplifiers to obtain a synthesized waveform.

[0029] In a third aspect of the present invention, an electronic device is provided, comprising: at least one processor, a memory and an input-output unit; wherein the memory is used to store a computer program, and the processor is used to call the computer program stored in the memory to execute any one of the methods described in the first aspect.

[0030] In a fourth aspect of the present invention, a computer-readable storage medium is provided, which includes instructions, and when the instructions are executed on a computer, the computer executes any one of the methods in the first aspect.

[0031] According to the above-mentioned embodiments of the present invention, at least the following beneficial effects are achieved: the method provided by the present invention significantly reduces the nonlinear distortion in the amplification process by dividing the input high PAPR waveform into two sub-waveforms with lower PAPR, and using independent RF power amplifiers to amplify these sub-waveforms respectively. This method not only improves the quality and reliability of signal transmission, but also reduces the energy consumption of the overall system by optimizing the use of amplifiers. In addition, through precise waveform synthesis technology, the synthesized waveform can maintain the same PAPR as the original waveform, ensuring that the performance of the signal is not lost during the transmission process. Further, the waveform folding algorithm and the design of the power synthesizer used in the embodiments of the present invention provide a novel and effective solution for reducing PAPR. This method achieves effective waveform folding by increasing the amplitude at the peak of the signal and reducing the amplitude at the valley, thereby further reducing the PAPR. At the same time, by adjusting the phase and amplitude of the sub-waveform, the consistency and high quality of the synthesized waveform are ensured. The application of this technology, especially when processing orthogonal frequency division multiplexing (OFDM) waveforms, can significantly improve the performance of the communication system and meet the requirements of modern communications for high efficiency and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0033] Figure 1 A schematic flow chart of a method for reducing a high PAPR waveform in a radio frequency power amplifier provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a flow chart of a waveform folding algorithm provided by an embodiment of the present invention;

[0035] Figure 3 A schematic flow chart of a method for obtaining a synthetic waveform provided by an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of an envelope folding process provided by an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the effect of reducing the PAPR waveform provided by an embodiment of the present invention;

[0038] Figure 6 A schematic diagram of a continuous wave radio frequency signal with a fixed amplitude provided by an embodiment of the present invention;

[0039] Figure 7 This is a comparison chart of traditional modulated RF and envelope normalized input;

[0040] Figure 8 A schematic diagram of a synthesis system provided by an embodiment of the present invention;

[0041] Fig. 9 A schematic diagram of the structure of a system for reducing high PAPR waveforms in a radio frequency power amplifier provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0043] Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, apparatus, method or computer program product. Therefore, the present invention can be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0044] It should be noted that any number of elements in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0045] Reference below Figure 1 , Figure 1 A flow chart of a method for reducing a high PAPR waveform in a radio frequency power amplifier provided by an embodiment of the present invention. Figure 1 As shown, a method 100 for reducing a high PAPR waveform in a radio frequency power amplifier includes:

[0046] Step 101, dividing an input high PAPR waveform into two sub-waveforms with lower PAPR;

[0047] In some embodiments, step 101 involves receiving a signal with a high PAPR and dividing it into two sub-signals using digital signal processing technology, wherein the PAPR of the two sub-signals is lower than that of the original signal. The purpose of the division is to enable each sub-signal to be amplified more efficiently.

[0048] Specifically, the segmentation process may include performing a time domain analysis on the original signal, identifying its envelope peak, and using a specific algorithm, such as peak halving or peak shifting, to create two sub-waveforms with lower PAPR.

[0049] Preferably, the segmentation algorithm may adopt an adaptive threshold determination technique to dynamically adjust the segmentation point according to the characteristics of the original signal to maximize the PAPR reduction effect while maintaining the signal quality.

[0050] Step 102, using two independent RF power amplifiers to respectively amplify the sub-waveform, wherein the sub-waveform received by the first RF power amplifier is a sub-waveform with a PAPR reduced by 6 dB compared with the original waveform, and the second RF power amplifier receives a sub-waveform with a fixed amplitude;

[0051] In some embodiments, step 102 involves using two independent power amplifiers to respectively amplify the two sub-waveforms obtained in step 101. The first amplifier processes the sub-waveform with a 6dB reduced PAPR, while the second amplifier processes the sub-waveform with a fixed amplitude.

[0052] Specifically, each amplifier is designed to operate at a specific power level and frequency range to achieve optimal amplification efficiency. The first amplifier may be configured to process signals with a high dynamic range, while the second amplifier is optimized to process signals with a constant envelope.

[0053] Preferably, each amplifier may adopt a Doherty amplifier architecture or an EER (Enhanced Efficiency Reduction)-like technology to further improve the amplification efficiency, especially when processing a signal with reduced PAPR.

[0054] Step 103, synthesizing the amplified sub-waveforms output by the two RF power amplifiers to obtain a synthesized waveform.

[0055] In some embodiments, step 103 involves combining the two amplified sub-waveforms through a synthesizer to restore the integrity of the original signal. The synthesizer is designed to accurately control the phase and amplitude of the two sub-waveforms to ensure the quality of the synthesized waveform.

[0056] Specifically, the synthesis process may include using a phase locked loop (PLL) to synchronize the phases of the two sub-waveforms, and using a variable gain amplifier (VGA) to adjust their amplitudes to achieve accurate synthesis.

[0057] Preferably, the synthesizer may integrate a digital signal processor (DSP) that is capable of not only adjusting the phase and amplitude but also performing post-processing on the synthesized waveform, such as filtering and equalization, to further optimize the signal quality and ensure that the PAPR of the synthesized waveform is the same as the original waveform.

[0058] Further, dividing the input high PAPR waveform into two sub-waveforms with lower PAPR includes processing the input high PAPR waveform by a waveform folding algorithm to generate the two sub-waveforms with lower PAPR.

[0059] Reference below Figure 2 , Figure 2 A schematic diagram of a flow chart of a waveform folding algorithm provided in one embodiment of the present invention.

[0060] The waveform folding algorithm comprises the following steps 200 including:

[0061] Step 201, setting a frequency conversion mixer at the transmitting end of the radio frequency power amplifier, and generating a continuous wave radio frequency signal based on the frequency conversion mixer;

[0062] In some embodiments, step 201 involves integrating a frequency conversion mixer at the transmitting end, which is capable of generating a stable continuous wave (CW) RF signal as a reference signal for the waveform folding process.

[0063] Specifically, the frequency conversion mixer may be a mixer based on direct digital synthesizer (DDS) technology, which can provide a high-precision and wide-bandwidth CW signal for a subsequent waveform folding algorithm.

[0064] Preferably, the DDS mixer can be configured to generate a CW signal synchronized with the carrier frequency of the OFDM signal to ensure phase continuity and frequency consistency of the signal during the waveform folding process.

[0065] Step 202, using the continuous wave radio frequency signal, measuring the envelope of the input signal through an envelope ranging mechanism, and adjusting the envelope according to the measurement result to achieve normalization;

[0066] In some embodiments, step 202 involves using a CW signal to measure the envelope of the input OFDM signal and normalizing the envelope by adjustment, which is to reduce the PAPR of the signal.

[0067] Specifically, a peak detector may be used to determine the peak value of the input signal, and then the peak value of the input signal is adjusted according to the amplitude of the CW signal to normalize it to a predetermined level.

[0068] Preferably, the normalization process can be implemented by a closed-loop control system, which includes an error amplifier and regulator, and automatically adjusts the gain of the input signal until its envelope matches the envelope of the CW signal.

[0069] Step 203, controlling the envelope of the normalized continuous wave radio frequency signal, increasing the amplitude at the peak of the continuous wave radio frequency signal, and reducing the amplitude at the valley, so as to achieve waveform folding.

[0070] In some embodiments, step 203 involves further amplitude adjustment of the normalized signal to achieve waveform folding, which is to further reduce the PAPR and prepare the signal for power amplification.

[0071] Specifically, the peak and valley values ​​of the signal can be precisely controlled by a programmable gain amplifier (PGA), wherein the gain at the peak value is reduced and the gain at the valley value is increased, thereby achieving waveform folding.

[0072] Preferably, the gain adjustment of the PGA may be based on a predefined waveform folding function, which dynamically adjusts the gain according to the peak and valley values ​​of the signal to ensure that the PAPR of the sub-signal after waveform folding is significantly lower than that of the original signal.

[0073] For example, taking an OFDM signal with a high PAPR as an example, the waveform folding algorithm is used to convert it into two sub-waveforms with lower PAPR so as to perform power amplification more efficiently. The complete steps are as follows:

[0074] Step 1: Generate a CW RF signal

[0075] At the transmitting end of the RF power amplifier, we set a frequency conversion mixer. This mixer generates a continuous wave RF (CW) signal based on a stable reference frequency (for example, a crystal oscillator with low phase noise). The frequency of this CW signal is consistent with the center frequency of the OFDM signal, and the amplitude is adjustable.

[0076] Step 2: Envelope ranging and normalization

[0077] Next, the envelope of the OFDM signal is measured using the CW signal. The amount of adjustment required is determined by comparing the instantaneous amplitude of the OFDM signal with the amplitude of the CW signal. The measurement result is used to adjust the envelope of the OFDM signal so that its peak aligns with the amplitude of the CW signal to achieve normalization. This step can be accomplished with a dynamically adjusted gain control circuit.

[0078] Step 3: Waveform Folding

[0079] After the envelope of the OFDM signal is normalized, we adjust the amplitude of the CW signal to achieve waveform folding. Specifically, at the peak of the OFDM signal, we reduce the amplitude of the CW signal to half of the original amplitude, and at the valley, we increase the amplitude of the CW signal to half of the original amplitude. In this way, the peaks and valleys of the OFDM signal are redistributed around the new amplitude level of the CW signal, forming two sub-waveforms with lower PAPR.

[0080] Step 4: Sub-waveform zoom

[0081] The two sub-waveforms are then fed into two separate RF power amplifiers for amplification. The first amplifier receives a sub-waveform with a PAPR that is 6dB lower than the original OFDM signal, while the second amplifier receives a sub-waveform with a fixed amplitude adjustment.

[0082] Step 5: Synthesize the Waveform

[0083] Finally, the two amplified sub-waveforms are combined in a power combiner. The combiner ensures that the two sub-waveforms are precisely aligned in phase and amplitude to restore the shape and characteristics of the original OFDM signal with reduced PAPR.

[0084] Through the above exemplary embodiments, a high PAPR signal can be converted into two low PAPR signals suitable for efficient amplification through a waveform folding algorithm, and the original signal can be restored by synthesizing these signals, thereby improving the performance and efficiency of the entire communication system.

[0085] Further, increasing the amplitude at the peak value of the signal and reducing the amplitude at the valley value includes:

[0086] The amplitude is increased by 1 / 2 at the peak of the continuous wave RF signal, and is reduced by 1 / 2 at the valley.

[0087] In some embodiments, the method of increasing the amplitude at the peak of the signal and reducing the amplitude at the valley includes:

[0088] At the peak of the CW RF signal, a specific gain adjustment mechanism is used to increase the signal amplitude to 1.5 times its original value. This amplitude increase helps with subsequent waveform processing to reduce the overall PAPR.

[0089] Specifically, the amplitude adjustment can be achieved in the following ways:

[0090] An automatic gain control (AGC) system with threshold detection is used. When the instantaneous amplitude of the CW RF signal exceeds a preset threshold, indicating that the signal is at a peak, the AGC system automatically adjusts the signal amplitude.

[0091] Preferably, the gain adjustment can be adaptive, using a feedback loop to continuously monitor the quality and amplitude changes of the output signal and dynamically adjust the gain to ensure that accurate control of the peak amplitude is maintained under all operating conditions.

[0092] The reduction of the amplitude at the valley value of the signal can be achieved in the following way. When the signal detects a valley, the amplitude of the signal is reduced to half of its original value through the corresponding algorithm. This helps to balance the difference between the peak and valley of the signal and further reduce the PAPR.

[0093] Specifically, valley amplitude reduction can be achieved in the following way: A valley detection algorithm is set up that can accurately identify the valleys of the signal and apply amplitude reduction operations at these points.

[0094] Preferably, the valley amplitude reduction can be performed synchronously with the peak amplitude increase, ensuring smooth amplitude variation throughout the entire signal cycle, reducing possible distortion, and maintaining the overall quality of the signal.

[0095] In some embodiments, waveform folding can be achieved by accurately identifying peaks and valleys through a digital signal processing (DSP) algorithm and applying appropriate gain adjustments to achieve the desired waveform transformation. The system is able to learn the characteristics of the signal and optimize the gain adjustment strategy to achieve the best PAPR reduction effect while minimizing signal distortion.

[0096] Reference below Figure 3 , Figure 3 A schematic diagram of a process for obtaining a synthetic waveform provided by an embodiment of the present invention.

[0097] like Figure 3 As shown, further, obtaining the synthesized waveform includes the following steps:

[0098] Step 301, configuring a power combiner, and receiving two sub-waveforms amplified by a high-efficiency radio frequency power amplifier based on the power combiner;

[0099] In some embodiments, step 301 involves configuring a power combiner designed to receive and process two sub-waveforms amplified by a high-efficiency RF power amplifier. The power combiner plays a key role in this process to ensure the quality and performance of the combined waveform.

[0100] Specifically, a system consisting of multiple amplifiers and corresponding control circuits is used, each amplifier is responsible for processing a sub-waveform. These amplifiers can be solid-state amplifiers, such as metal oxide semiconductor field effect transistor (MOSFET) or high electron mobility transistor (HEMT) amplifiers.

[0101] The power combiner may incorporate a signal distribution network to ensure that the two sub-waveforms have uniform power distribution and phase relationship before entering the combiner.

[0102] Step 302, detecting and locking the phase information of the two sub-waveforms;

[0103] In some embodiments, step 302 involves accurately detecting and tracking the phase of each sub-waveform using a phase locked loop (PLL) or similar synchronization technique.

[0104] In some embodiments, the PLL system can quickly lock to the frequency and phase of the sub-waveform, ensuring phase consistency during the synthesis process. A fully digital PLL or a mixed signal PLL can be used to provide higher locking speed and more accurate phase tracking.

[0105] Step 303, adjusting the phase of each sub-waveform to ensure that the phases of the two sub-waveforms are consistent at the synthesis point;

[0106] In some embodiments, step 303 involves dynamically adjusting the phase of each sub-waveform using digital signal processing (DSP) techniques or an analog phase adjuster. The dynamic adjustment can be based on a feedback signal provided by the PLL to compensate for any phase deviation caused by propagation delay or amplifier characteristics.

[0107] Preferably, a real-time programmable DSP algorithm may be used to achieve more flexible and precise phase adjustment.

[0108] Step 304, measuring and comparing the amplitudes of the two sub-waveforms, and compensating the sub-waveform with the smaller amplitude through the gain control element to ensure that the amplitudes of the two sub-waveforms are consistent.

[0109] In some embodiments, step 304 involves using an amplitude detector to measure the amplitude of the two sub-waveforms and compare it to a predetermined reference value. The amplitude detector can be a peak detector or an average detector, which can provide accurate amplitude readings.

[0110] Preferably, a variable gain amplifier (VGA) or a gain control element may be used to adjust the gain of the sub-waveform according to the output of the amplitude detector to ensure that the two sub-waveforms have consistent amplitude levels before being synthesized.

[0111] Through the above steps, the PAPR of the synthesized waveform is effectively reduced, while ensuring the phase and amplitude consistency of the synthesized waveform, thereby improving the efficiency of the RF power amplifier and the quality of signal transmission.

[0112] Furthermore, the high PAPR waveform includes an orthogonal frequency division multiplexing waveform.

[0113] In some embodiments, the present invention is particularly directed to Orthogonal Frequency Division Multiplexing (OFDM) waveforms, which are a modulation technique widely used in modern wireless communication systems such as 4G LTE, 5G, and Wi-Fi. OFDM waveforms improve spectrum utilization and resist frequency selective fading by distributing data across many closely spaced subcarriers.

[0114] Specifically, in some embodiments, OFDM signals can be processed to reduce their high PAPR characteristics. This is usually achieved by applying specific techniques in the signal generation stage, such as the Selected Mapping (SLM) or Tone Reservation (TR) method. The Selected Mapping method involves selecting the symbol with the lowest PAPR from multiple OFDM symbols for transmission, while the Tone Reservation method adds additional control signals to the OFDM signal to reduce the PAPR.

[0115] Furthermore, in some embodiments, digital signal processing techniques may be used to adjust the amplitude and phase of the OFDM signal to further reduce the PAPR. For example, a dynamic range control (DRC) algorithm may be used to adjust the amplitude of the subcarrier, or a phase adjustment technique may be used to change the phase distribution of the signal.

[0116] After the signal has been processed for PAPR reduction, the method involves using two separate RF power amplifiers to amplify the processed sub-waveforms. These amplifiers are designed to operate at different power levels to optimize efficiency. For example, the first amplifier may be optimized for the portion of the signal with a higher PAPR, while the second amplifier is optimized for the portion of the signal with a lower PAPR or a fixed amplitude.

[0117] In some embodiments, the two amplified sub-waveforms are combined to restore the shape of the original OFDM signal. This is typically accomplished using a power combiner that can accurately combine the two signals while maintaining phase and amplitude consistency. The design of the combiner can include the use of techniques such as phase arrays or Wilkinson combiners that can combine the signals without adding additional distortion.

[0118] Through the above embodiments, the PAPR of the OFDM signal is effectively reduced, while the integrity and transmission quality of the signal are maintained, thereby improving the efficiency of the radio frequency power amplifier and the performance of the overall communication system.

[0119] Furthermore, the PAPR of the synthesized waveform is the same as that of the original waveform.

[0120] In some embodiments, the method of synthesizing a waveform with the same PAPR as the original waveform involves the following key steps and components:

[0121] Waveform preprocessing: The original high PAPR waveform is preprocessed to reduce its PAPR before the signal is amplified. This may include the use of digital signal processing techniques such as peak halving, signal distortion, or superimposed sidetone.

[0122] Sub-waveform amplification: The pre-processed waveform is split into two sub-waveforms and amplified using two independent RF power amplifiers. The first amplifier processes the sub-waveform with reduced PAPR, while the second amplifier processes the sub-waveform with fixed amplitude.

[0123] Phase and amplitude synchronization: Before combining the waveforms, ensure that the two sub-waveforms are synchronized in phase and amplitude. This usually involves using a phase-locked loop (PLL) and gain control elements to adjust the sub-waveforms.

[0124] Power combining: The two adjusted sub-waveforms are combined into a single combined waveform using a power combiner. The combiner is designed to minimize distortion and phase deviation during the combining process.

[0125] Specifically, methods for maintaining the PAPR of the synthesized waveform the same as that of the original waveform may include:

[0126] Step 1: During the synthesis process, the PAPR of the synthesized waveform is monitored in real time and compared with the PAPR of the original waveform.

[0127] Step 2: Based on the monitoring results, the amplification parameters of the sub-waveform, such as gain and phase, are dynamically adjusted through a feedback control system to ensure that the PAPR of the synthesized waveform matches the original waveform.

[0128] Step 3, using an optimization algorithm, such as a genetic algorithm or a gradient descent method, to determine the best sub-waveform amplification parameters to minimize the PAPR of the synthesized waveform.

[0129] Preferably, PAPR control of the synthesized waveform can be achieved by:

[0130] Adaptive filtering: The synthesized waveform is post-processed using an adaptive filter to further reduce the PAPR while maintaining signal quality.

[0131] Digital pre-distortion correction: Digital pre-distortion correction technology is applied in the power amplifier to compensate for nonlinear effects and ensure that the PAPR of the synthesized waveform is not affected by the amplifier nonlinearity.

[0132] Multi-objective optimization: When designing amplifiers and synthesizers, a multi-objective optimization approach is used, simultaneously considering PAPR reduction and other performance metrics such as signal distortion and efficiency.

[0133] Reference below Figure 4 , Figure 4 A schematic diagram of an envelope folding process provided by an embodiment of the present invention.

[0134] As attached Figure 4 As shown, Figure 4The envelope folding process is demonstrated, which is one of the core steps of the present invention. In this process, the envelope of the input signal is adjusted to reduce its peak value, thereby reducing the overall PAPR. Through this process, the peak-to-average power ratio of the signal is effectively controlled, laying the foundation for the subsequent improvement of the power amplifier efficiency.

[0135] Envelope folding may involve the use of specific algorithms, such as peak halving or peak shifting, to reduce the peak amplitude of the signal. This process not only reduces the PAPR, but also maintains the spectral characteristics of the signal to ensure signal quality. The envelope folding process can also be combined with other PAPR reduction techniques, such as selected sequences or superimposed sidetone technology, to further optimize the PAPR reduction effect. This comprehensive approach provides a more flexible signal processing scheme to adapt to different communication standards and application requirements.

[0136] The envelope folding process is a key technical means to achieve PAPR reduction. Through this technology, the signal has been optimized before entering the power amplifier, reducing the impact of high power peaks on amplifier efficiency.

[0137] Reference below Figure 5 , Figure 5 A schematic diagram of the effect of reducing the PAPR waveform provided by an embodiment of the present invention.

[0138] like Figure 5 As shown in Figure 1, the difference between the peak power (Pmax) and the average power (Pavg) of the original signal is reduced by 6dB. This reduction is achieved by adjusting the envelope of the signal, thereby reducing the dynamic range of the signal.

[0139] In an embodiment of the present invention, the reduction of PAPR is achieved by accurately controlling the peak and valley values ​​of the signal. For example, the signal can be pre-distorted or gain controlled by digital signal processing technology to achieve the required PAPR reduction. The PAPR reduction effect is crucial to improving the efficiency of the RF power amplifier. By reducing the peak power demand of the signal, the power amplifier can operate at a lower power back-off level, thereby reducing energy consumption and improving overall amplification efficiency.

[0140] Reference below Figure 6 , Figure 6 A schematic diagram of a continuous wave radio frequency signal with a fixed amplitude provided by an embodiment of the present invention.

[0141] A fixed amplitude continuous wave RF signal, which is generated during the waveform folding process. The amplitude of this signal remains constant and does not change over time, providing a stable reference for signal synthesis. In the present invention, the fixed amplitude signal can be used to synthesize with another adjusted sub-waveform to restore the shape of the original signal. This synthesis method helps to ensure that the PAPR of the synthesized waveform is the same as the original waveform while improving the amplification efficiency. The fixed amplitude signal can also be used to calibrate the power amplifier to ensure that the amplitude of the signal remains consistent during the amplification process. This calibration process is critical to maintaining signal integrity and communication quality.

[0142] Reference below Figure 7 , Figure 7 A comparison chart of traditional modulated RF and envelope normalized input.

[0143] Attached Figure 7 The conventional modulated RF signal and the input signal after envelope normalization are compared. The envelope of the conventional modulated signal varies greatly, while the signal after normalization has a more stable envelope. In the present invention, envelope normalization is achieved by adjusting the peak and valley values ​​of the signal to reduce the dynamic range of the signal. This processing not only reduces the PAPR, but also provides more favorable conditions for signal power amplification. Figure 7 The normalized input signal in can be combined with other signal processing techniques, such as digital pre-distortion correction or adaptive filtering, to further optimize signal quality and reduce PAPR. This integrated approach provides a comprehensive signal processing strategy to meet the needs of modern communication systems.

[0144] Reference below Figure 8 , Figure 8 A schematic diagram of a synthesis system provided in an embodiment of the present invention.

[0145] Attached Figure 8 A synthesis system provided by some embodiments of the present invention is shown, which combines two sub-waveforms amplified by a radio frequency power amplifier into a single output signal. The system ensures that the PAPR of the synthesized waveform is the same as that of the original waveform.

[0146] In some embodiments, the design of the synthesis system allows for precise control of the phase and amplitude of the two sub-waveforms. By using a phase locked loop (PLL) and gain control elements, the synthesis system can ensure the consistency and accuracy of the sub-waveforms when synthesizing.

[0147] The synthesis system may also include a feedback control mechanism for real-time monitoring of the PAPR and signal quality of the synthesized waveform. Such monitoring and adjustment ensure that the synthesized waveform meets predetermined performance criteria, such as signal-to-noise ratio (SNR) and error vector magnitude (EVM).

[0148] like Fig. 9 As shown, in some embodiments, a system 900 for reducing a high PAPR waveform in a radio frequency power amplifier includes:

[0149] A segmentation module 901, configured to segment an input high PAPR waveform into two sub-waveforms with lower PAPR;

[0150] an amplification module 902, configured to amplify the sub-waveforms respectively using two independent RF power amplifiers, wherein the sub-waveform received by the first RF power amplifier is a sub-waveform with a PAPR reduced by 6 dB compared with the original waveform, and the second RF power amplifier receives a sub-waveform with a fixed amplitude;

[0151] The synthesis module 903 is used to synthesize the amplified sub-waveforms output by the two RF power amplifiers to obtain a synthesized waveform.

[0152] It is understood that the modules described in the system 900 for reducing high PAPR waveforms in a radio frequency power amplifier are similar to those described in the reference Figure 1 Therefore, the operations, features and beneficial effects described above for the method for reducing a high PAPR waveform in a radio frequency power amplifier are also applicable to the system 900 for reducing a high PAPR waveform in a radio frequency power amplifier and the modules contained therein, and will not be described in detail here.

[0153] Another embodiment of the present invention provides an electronic device. The electronic devices in some embodiments of the present invention may include but are not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc.

[0154] Electronic devices may include processing devices (e.g., central processing units, graphics processing units, etc.), which may perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) or programs loaded from a storage device into a random access memory (RAM). In RAM, various programs and data required for the operation of the electronic device are also stored. The processing device, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0155] Typically, the following devices may be connected to the I / O interface: input devices including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices including, for example, a magnetic tape, a hard disk, etc.; and communication devices. The communication device may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. It should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have alternatively.

[0156] Furthermore, the storage medium of the embodiment of the present application stores program instructions that can implement all the above methods, wherein the program instructions can be stored in the above storage medium in the form of a software product, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or terminal devices such as a computer, a server, a mobile phone, and a tablet.

[0157] The above descriptions are only some preferred embodiments of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present invention is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present invention to form a technical solution.

Claims

1. A method for reducing high PAPR waveforms in a radio frequency power amplifier, characterized in that: The following steps are involved: Split the input high PAPR waveform into two sub-waveforms with lower PAPR; Using two independent radio frequency power amplifiers to amplify the sub-waveforms respectively, wherein the sub-waveform received by the first radio frequency power amplifier is a sub-waveform with a PAPR reduced by 6 dB compared with the original waveform, and the second radio frequency power amplifier receives a sub-waveform with a fixed amplitude; The amplified sub-waveforms output by the two radio frequency power amplifiers are synthesized to obtain a synthesized waveform; The step of dividing the input high PAPR waveform into two sub-waveforms with lower PAPR comprises: Processing the input high PAPR waveform by a waveform folding algorithm to generate the two sub-waveforms with lower PAPR; The waveform folding algorithm comprises the following steps: A frequency conversion mixer is provided at the transmitting end of the radio frequency power amplifier, and a continuous wave radio frequency signal is generated based on the frequency conversion mixer; Using the continuous wave radio frequency signal, the envelope of the input signal is measured through an envelope ranging mechanism, and the envelope is adjusted according to the measurement result to achieve normalization; Controlling the envelope of the normalized continuous wave radio frequency signal, increasing the amplitude at the peak of the continuous wave radio frequency signal and reducing the amplitude at the valley, thereby realizing waveform folding; The increasing the amplitude at the peak value of the continuous wave radio frequency signal and reducing the amplitude at the valley value includes: The amplitude is increased by 1 / 2 at the peak of the continuous wave RF signal, and decreased by 1 / 2 at the valley; The obtaining of the synthetic waveform comprises: A power combiner is configured, and the power combiner receives two sub-waveforms amplified by a high-efficiency radio frequency power amplifier; Detecting and locking the phase information of the two sub-waveforms; Adjust the phase of each sub-waveform to ensure that the phases of the two sub-waveforms are consistent at the synthesis point; The amplitudes of the two sub-waveforms are measured and compared, and the sub-waveform with the smaller amplitude is compensated by the gain control element to ensure that the amplitudes of the two sub-waveforms are consistent.

2. A method for reducing high PAPR waveform in a radio frequency power amplifier according to claim 1, characterized in that: The high PAPR waveform comprises an orthogonal frequency division multiplexing waveform.

3. A method for reducing high PAPR waveform in a radio frequency power amplifier according to claim 1, characterized in that: The PAPR of the synthesized waveform is the same as that of the original waveform.

4. A system for reducing high PAPR waveforms in a radio frequency power amplifier, characterized in that: include: A segmentation module, for segmenting an input high PAPR waveform into two sub-waveforms with lower PAPR; an amplification module, configured to respectively amplify the sub-waveforms using two independent radio frequency power amplifiers, wherein the sub-waveform received by the first radio frequency power amplifier is a sub-waveform with a PAPR reduced by 6 dB compared with the original waveform, and the second radio frequency power amplifier receives a sub-waveform with a fixed amplitude; A synthesis module, used for synthesizing the amplified sub-waveforms output by the two radio frequency power amplifiers to obtain a synthesized waveform; The step of dividing the input high PAPR waveform into two sub-waveforms with lower PAPR comprises: Processing the input high PAPR waveform by a waveform folding algorithm to generate the two sub-waveforms with lower PAPR; The waveform folding algorithm comprises the following steps: A frequency conversion mixer is provided at the transmitting end of the radio frequency power amplifier, and a continuous wave radio frequency signal is generated based on the frequency conversion mixer; Using the continuous wave radio frequency signal, the envelope of the input signal is measured through an envelope ranging mechanism, and the envelope is adjusted according to the measurement result to achieve normalization; Controlling the envelope of the normalized continuous wave radio frequency signal, increasing the amplitude at the peak of the continuous wave radio frequency signal and reducing the amplitude at the valley, thereby realizing waveform folding; The increasing the amplitude at the peak value of the continuous wave radio frequency signal and reducing the amplitude at the valley value includes: The amplitude is increased by 1 / 2 at the peak of the continuous wave RF signal, and decreased by 1 / 2 at the valley; The obtaining of the synthetic waveform comprises: A power combiner is configured, and the power combiner receives two sub-waveforms amplified by a high-efficiency radio frequency power amplifier; Detecting and locking the phase information of the two sub-waveforms; Adjust the phase of each sub-waveform to ensure that the phases of the two sub-waveforms are consistent at the synthesis point; The amplitudes of the two sub-waveforms are measured and compared, and the sub-waveform with the smaller amplitude is compensated by the gain control element to ensure that the amplitudes of the two sub-waveforms are consistent.

5. An electronic device comprising: one or more processors; a storage device having one or more programs stored thereon; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 3.

6. A computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, enables the processor to implement the method according to any one of claims 1 to 3.

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