CN-122026860-A - System, method, equipment and storage medium for adaptively suppressing radio frequency spurious signals

CN122026860ACN 122026860 ACN122026860 ACN 122026860ACN-122026860-A

Abstract

The invention discloses a system, a method, equipment and a storage medium for adaptively suppressing radio frequency spurious signals, and belongs to the technical field of radio frequency of wireless communication. The system comprises a reference signal input module, an unknown stray system, a first-stage signal cancellation module, a second-stage signal cancellation module and a feedback control module. The method comprises the following steps of obtaining a reference signal and a mixed signal containing strays, dynamically generating a first cancellation signal through feedback control to eliminate a main signal and extract the strays, and further generating a second cancellation signal through feedback control to eliminate the strays. The amplitude and the phase of the cancellation signal are adjusted in real time through closed loop feedback mechanisms such as quadrature decomposition, mixing, integration and the like, so that the self-adaption and high-precision suppression of spurious signals with unknown frequency or adjacent frequency is realized, and meanwhile, useful signals are protected to the greatest extent. The invention has the advantages of nondestructive inhibition, strong adaptability, quick response and easy integration.

Inventors

REN RUOFEI
ZHENG ZHAOJIAN
WANG WUGUI

Assignees

电信科学技术第一研究所有限公司
上海迪爱斯信息技术有限公司
中国信息通信科技集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260123

Claims (10)

1. A radio frequency spurious signal adaptive suppression system, comprising: a reference signal input module for inputting a reference signal , wherein, For the reference signal amplitude to be a reference signal, Is the frequency of the primary signal and, Initial phase for the reference signal; unknown spurious system for generating a mixed signal comprising a main signal and spurious signals , wherein, Is the amplitude of the primary signal, Is the phase of the main signal and is the phase of the main signal, For the amplitude of the spurious signal, For the spurious frequencies to be present, Is the spurious signal phase; the first-stage signal cancellation module is connected with the reference signal input module and the unknown spurious system and is used for canceling the main signal in the mixed signal and extracting the spurious signal; The second-stage signal cancellation module is connected with the first-stage signal cancellation module and is used for canceling the extracted stray signals; the feedback control module is respectively connected with the first-stage signal cancellation module and the second-stage signal cancellation module, and is used for generating error voltage in real time according to the cancelled residual signals and dynamically generating control signals to adjust the cancellation process according to the error voltage; the first-stage signal cancellation module and the second-stage signal cancellation module comprise a signal coupler, a quadrature power divider, a mixer, a traffic blocking straight device, an integrator and a vector amplitude modulator which are sequentially connected, wherein the output end of the vector amplitude modulator is connected with the input end of the signal coupler to form a cancellation loop.
2. The system according to claim 1, wherein: the feedback control module comprises an inverting integrator and an in-phase integrator, which are respectively used for controlling the voltage according to the error And Output control voltage And ; The output control voltage of the inverting integrator satisfies: , wherein, And The resistance value and the capacitance value of the integrator are respectively; the output control voltage of the in-phase integrator satisfies the following conditions: ; The vector amplitude modulator is used for controlling the voltage according to the control voltage And Generating a cancellation signal: 。
3. the system of claim 2, wherein the error voltage generation process of the feedback control module satisfies: The orthogonal power divider divides an input signal Decomposing into in-phase signals And quadrature signal , wherein, Is that Is a hilbert transform of (c); The mixer will reference signals Mixing with the in-phase signal and the quadrature signal respectively to obtain a mixed output: , ; The traffic isolating DC filters out high-frequency components in the mixed output and extracts DC error voltage: , 。
4. the system according to claim 1, wherein: The system also comprises a time delay structure which is connected between the output end of the first-stage signal cancellation module and the input end of the second-stage signal cancellation module, and is used for compensating the processing time of the first-stage signal cancellation module and inputting the extracted stray signals into the second-stage signal cancellation module.
5. The system according to any one of claims 1 to 4, wherein: The system is suitable for suppressing spurious signals in wireless communications, radio frequency microwave transceivers or power amplifiers, and is particularly suitable for situations where the frequency of the spurious signals is unknown or very close to the frequency of the main signal.
6. The adaptive suppression method for the radio frequency spurious signals is characterized by comprising the following steps of: step S1, acquiring a reference signal And a mixed signal comprising a main signal and a spurious signal , wherein, For the reference signal amplitude to be a reference signal, Is the frequency of the primary signal and, Initial phase for the reference signal; is the amplitude of the primary signal, Is the phase of the main signal and is the phase of the main signal, For the amplitude of the spurious signal, For the spurious frequencies to be present, Is the spurious signal phase; step S2, a first-stage cancellation step of dynamically generating a first cancellation signal by feedback control based on the reference signal Coupling the first cancellation signal with the mixed signal, and canceling the main signal in the mixed signal to obtain an intermediate signal mainly comprising stray signals ; Step S3, a second-stage cancellation step, namely dynamically generating a second cancellation signal through feedback control based on the intermediate signal, and canceling the spurious signals in the intermediate signal; the feedback control comprises quadrature decomposition and mixing of residual signals, extraction of error voltages, generation of control voltages through integral operation, and vector modulation driven by the control voltages to generate cancellation signals.
7. The method of claim 6, wherein the feedback control procedure in the first stage cancellation step or the second stage cancellation step specifically comprises: Will residual signal Input quadrature power divider for decomposition into in-phase components And orthogonal component , wherein, Is that Is a hilbert transform of (c); The reference signal is processed Respectively mixing with the in-phase component and the quadrature component to obtain a mixed signal And ; The mixed signal is subjected to low-pass filtering to extract direct-current error voltage And ; The error voltage is set to And Respectively input into an inverting integrator and an in-phase integrator for integration to generate control voltage And Wherein: , , And The resistance value and the capacitance value of the integrator are respectively; driving a vector amplitude modulator according to the control voltage to generate a cancellation signal 。
8. The method according to claim 6 or 7, characterized in that: the method further comprises a delay compensation step of performing delay processing on the intermediate signal after the first-stage cancellation step and before the second-stage cancellation step to compensate for a pre-stage processing time.
9. An electronic device, comprising: At least one processor; A memory storing a computer program; the method of adaptive suppression of radio frequency spurious signals according to any of claims 6 to 8, when said computer program is executed by said processor.
10. A computer-readable storage medium, characterized by: The storage medium has stored thereon a computer program which, when executed by a processor, implements a method of adaptive suppression of radio frequency spurious signals according to any of claims 6 to 8.

Description

System, method, equipment and storage medium for adaptively suppressing radio frequency spurious signals Technical Field The invention relates to the technical field of wireless communication radio frequency, in particular to a system, a method, equipment and a storage medium for adaptively suppressing radio frequency spurious signals. Background Radio frequency spurious signal suppression is one of the key technologies in systems such as wireless communications, radio frequency transceivers, and power amplifiers. The presence of spurious signals can severely interfere with the useful signal, reduce the signal-to-noise ratio of the system, affect spectral efficiency, and may cause interference to nearby frequency band devices. Therefore, how to effectively and accurately suppress spurious signals has been the focus of research in the art. Currently, the mainstream spurious suppression technology mainly relies on two schemes of passive filtering and open loop cancellation, but the schemes have a plurality of inherent defects in practical application. The passive filter technology is the most widely used method at present, and passive elements such as an LC filter, a dielectric filter or a surface acoustic wave filter are generally adopted to form a band stop or low pass filter, so that spurious frequency components are filtered from a main radio frequency path. However, this technique has obvious drawbacks in that firstly, the filter itself introduces a non-negligible insertion loss, resulting in attenuation of the useful signal, thereby reducing the efficiency and signal-to-noise ratio of the whole system, secondly, its frequency response characteristics (such as center frequency, bandwidth and roll-off characteristics) are fixed after the manufacturing is completed, and lack of flexibility, and it is not effective to cope with spurious signals that vary due to component aging, temperature variation or switching of the operating frequency points of the system, especially spurious beams that are randomly generated, and finally, when the frequencies of the spurious signals are very close to those of the useful signal, the filter needs to have an extremely high roll-off characteristic in order to suppress the spurious signals while protecting the useful signal, which directly leads to a sharp increase in design difficulty, an increase in cost and an increase in physical size. The simple open loop cancellation technology provides a different thought, and the technical scheme is that parameters such as amplitude, phase and the like of stray signals are estimated in advance, and a fixed opposite phase signal is generated to be overlapped with an original signal, so that cancellation is realized. However, the open loop mode has the fundamental limitations that firstly, due to the lack of a feedback mechanism, the system cannot track and adapt to stray signal parameter drift caused by factors such as temperature drift, device aging, power supply fluctuation and the like, so that the cancellation effect rapidly deteriorates with time, secondly, in an analog circuit, the temperature drift and time drift of devices such as an amplifier, a phase shifter and the like cause that the matching precision of amplitude and phase is difficult to maintain for a long time, and the cancellation depth is limited and unstable. In summary, the prior art generally has the problems of poor flexibility, extra loss, incapability of self-adaptive change, limited long-term precision and the like, and is difficult to meet the requirements of a modern radio frequency system on high performance, high reliability and intelligence. The processing power of the prior art is especially placket in the face of "adjacent spurs" whose frequency is unknown, randomly occurring or very close to the frequency of the main signal. Therefore, there is a strong need in the industry for a new adaptive spurious suppression solution that can be perceived in real time, dynamically adjusted, and does not compromise the performance of the main signal. Disclosure of Invention The invention aims to provide a system, a method, equipment and a storage medium for adaptively suppressing radio frequency spurious signals, which are used for solving the problems that the conventional passive filter provided in the background art is poor in flexibility, large in insertion loss and incapable of tracking signal change by an open loop cancellation technology. In order to achieve the above purpose, the present invention provides the following technical solutions: a radio frequency spurious signal adaptive suppression system comprising: a reference signal input module for inputting a reference signal , wherein,For the reference signal amplitude to be a reference signal,Is the frequency of the primary signal and,Initial phase for the reference signal; unknown spurious system for generating a mixed signal comprising a main signal and spurious signals , wherein,Is the amplitude of