A method and system for demodulating and equalizing a high-order modulation signal

Abstract

The present application discloses a method and system for high-order modulation signal demodulation and equalization processing. A data transmission demodulation unit test system that supports high-order modulation and multi-loop targeted processing based on a distorted constellation diagram and its equalization processing method can effectively address various channel distortion problems and ensure high demodulation performance even under low signal-to-noise ratio conditions through an improved CMA and LMS combined equalization scheme, a multi-loop targeted processing module based on a distorted constellation diagram, and a line amplifier distortion compensation module. This scheme has broad application prospects and is particularly suitable for high-demand digital communication systems, especially in the fields of satellite communication and broadband communication.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and system for demodulating and equalizing high-order modulation signals. Background Art

[0002] With the development of communication technology, high-order modulation technology (such as 32APSK, 64APSK) has been widely used in satellite communication, broadband communication and other fields to improve spectrum utilization. However, high-order modulated signals are more sensitive to channel distortion (such as amplitude-frequency distortion, group delay distortion, multipath effect, line distortion and frequency deviation), especially under low signal-to-noise ratio conditions. Traditional equalization technology is difficult to effectively deal with these complex distortion problems. Especially in high-order modulation, the constellation points of different circles (such as outer circle, middle circle, inner circle) are affected differently by distortion. The constellation points of the inner circle have a smaller amplitude and poor noise resistance, while the constellation points of the outer circle have a larger amplitude and strong noise resistance. Therefore, how to design an equalization scheme that can perform targeted processing on the constellation points of different circles according to the distorted constellation diagram has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0003] Based on this, an embodiment of the present application provides a method and system for demodulating and equalizing high-order modulated signals. This method solves the problem that it is difficult to cope with high-order modulated signals and complex channel distortion in the prior art through an improved CMA (constant modulus algorithm) and LMS (least mean square algorithm) combined equalization scheme, combined with a multi-circle targeted processing module based on a distortion constellation diagram, to ensure high demodulation performance under low signal-to-noise ratio conditions.

[0004] In a first aspect, a method for demodulating and equalizing a high-order modulated signal is provided, the method comprising:

[0005] Acquire a high-order modulation signal, and perform timing recovery on the high-order modulation signal;

[0006] A CMA equalizer is used to perform coarse equalization processing on the signal after timing recovery; wherein the CMA equalizer adopts a fractionally spaced linear transverse equalizer structure, operates at 2 times the symbol frequency, and is used to solve non-specific channel linear distortion;

[0007] The signal after coarse equalization is subjected to multi-turn targeted processing based on the distorted constellation diagram; wherein the multi-turn targeted processing based on the distorted constellation diagram includes performing constellation diagram analysis on the received signal and entering the multi-turn targeted processing module based on the distorted constellation diagram, wherein the module analyzes the constellation diagram of the signal, identifies constellation points of different circles, and performs targeted processing on the constellation points of each circle according to the distortion situation;

[0008] Carry out carrier recovery on the signal after multi - loop targeted processing, and then enter the LMS equalizer for fine equalization processing; among them, the LMS equalizer adopts a fractionally spaced linear transversal equalizer structure, operates at twice the symbol frequency, and eliminates inter - symbol interference and line amplifier distortion.

[0009] Optionally, the step of entering the LMS equalizer for fine equalization processing further includes:

[0010] Analyze the amplitude and phase changes of the signal after carrier recovery, and extract the characteristic parameters related to line amplifier distortion;

[0011] According to the extracted characteristic parameters, dynamically adjust the weight coefficients of the LMS equalizer through an adaptive algorithm to compensate for line amplifier distortion in real - time;

[0012] During the compensation process, continuously monitor the amplitude and phase changes of the signal to ensure the accuracy and real - time nature of line amplifier distortion compensation, thereby ensuring the demodulation performance of high - order modulation signals under line amplifier distortion conditions.

[0013] Optionally, the multi - loop targeted processing based on the distorted constellation diagram specifically includes:

[0014] Conduct constellation diagram analysis on the received signal to identify constellation points in different loops, including outer - loop, middle - loop, and inner - loop constellation points;

[0015] Perform frequency offset estimation and compensation on the outer - loop constellation points, and quickly estimate the frequency offset by analyzing the phase changes of the outer - loop constellation points;

[0016] Adjust the equalizer parameters for the middle - loop constellation points, and dynamically adjust the equalizer parameters according to the distortion conditions of the middle - loop constellation points;

[0017] Perform error correction on the inner - loop constellation points to ensure the demodulation quality by analyzing the error conditions of the inner - loop constellation points.

[0018] Optionally, the carrier recovery specifically includes:

[0019] Perform phase correction on the signal to ensure that the phase of the signal is aligned with the phase of the local oscillator;

[0020] During the carrier synchronization process, utilize the signal after coarse equalization and multi - loop targeted processing to further improve the accuracy of phase correction.

[0021] Optionally, the fine equalization processing of the LMS equalizer specifically includes:

[0022] Adopt a fractionally spaced linear transversal equalizer structure and operate at twice the symbol frequency;

[0023] Dynamically adjust the weight coefficients of the equalizer through an adaptive algorithm to eliminate inter - symbol interference and line amplifier distortion;

[0024] Include a line amplifier distortion compensation module in the LMS equalizer, and adjust the equalizer parameters in real time by analyzing the amplitude and phase changes of the signal to compensate for line amplifier distortion.

[0025] Optionally, the method further includes:

[0026] After the LMS equalizer, demodulate the signal processed by fine equalization to recover the original data;

[0027] During the demodulation process, use the signal after carrier recovery and fine equalization processing to ensure the accuracy and stability of demodulation.

[0028] In a second aspect, a high-order modulation signal demodulation and equalization processing system is provided, and the system includes:

[0029] A timing synchronization module, configured to obtain a high-order modulation signal and perform timing recovery on the high-order modulation signal;

[0030] A CMA equalization module, configured to perform coarse equalization processing on the signal after timing recovery by using a CMA equalizer; wherein, the CMA equalizer adopts a fractional-spaced linear transverse equalizer structure and operates at 2 times the symbol frequency to solve non-specific channel linear distortion;

[0031] A multi-loop targeted processing module, configured to perform multi-loop targeted processing based on the distorted constellation diagram on the signal after coarse equalization; wherein, the multi-loop targeted processing based on the distorted constellation diagram includes performing constellation diagram analysis on the received signal to enter the multi-loop targeted processing module based on the distorted constellation diagram, and the module analyzes the constellation diagram of the signal, identifies the constellation points of different loops, and performs targeted processing on the constellation points of each loop according to the distortion situation;

[0032] An LMS equalization module, configured to perform carrier recovery on the signal after multi-loop targeted processing, and then enter the LMS equalizer for fine equalization processing; wherein, the LMS equalizer adopts a fractional-spaced linear transverse equalizer structure and operates at 2 times the symbol frequency to eliminate inter-symbol interference and line amplifier distortion.

[0033] Optionally, the system further includes:

[0034] A line amplifier distortion compensation module, configured to analyze the amplitude and phase changes of the signal after carrier recovery, and extract characteristic parameters related to line amplifier distortion;

[0035] According to the extracted characteristic parameters, dynamically adjust the weight coefficients of the LMS equalizer through an adaptive algorithm to compensate for line amplifier distortion in real time;

[0036] During the compensation process, continuously monitor the amplitude and phase changes of the signal to ensure the accuracy and real-time performance of line amplifier distortion compensation.

[0037] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the high-order modulation signal demodulation and equalization processing method described in any one of the above first aspects is implemented.

[0038] In a fourth aspect, a computer program product is provided, including a computer program / instructions. When the computer program / instructions are executed by a processor, the high-order modulation signal demodulation and equalization processing method described in any one of the above first aspects is implemented.

[0039] The beneficial effects brought by the technical solutions provided in the embodiments of the present application at least include:

[0040] Support for high-order modulation: Through the improved CMA and LMS equalization schemes, the system can effectively support high-order modulation signals (such as 32APSK, 64APSK), ensuring the demodulation performance under high-order modulation conditions.

[0041] Multi-loop targeted processing based on the distorted constellation diagram: By introducing a multi-loop targeted processing module based on the distorted constellation diagram, the system can perform targeted processing according to the characteristics of the constellation points in different loops, ensuring the accuracy of frequency offset estimation, the optimization of equalizer parameters, and the error correction of the inner-loop constellation points.

[0042] Line amplifier distortion compensation: By introducing a line amplifier distortion compensation module, the system can effectively cope with the line amplifier distortion problem, ensuring the demodulation performance under line amplifier distortion conditions.

[0043] High demodulation performance: Through the combined equalization scheme of CMA and LMS, the system can achieve high demodulation performance under low signal-to-noise ratio conditions, ensuring the stable recovery of the signal.

[0044] Low-threshold demodulation: The CMA equalizer, as a coarse equalizer, can effectively reduce the threshold of carrier synchronization, ensuring the initial signal recovery even in the case of large channel distortion.

[0045] Inter-symbol interference cancellation: The LMS equalizer, as a fine equalizer, can further eliminate inter-symbol interference, improve the demodulation quality, and ensure stable demodulation performance even under complex channel conditions. Description of the Drawings

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0047] Figure 1Flowchart of steps of a high - order modulation signal demodulation and equalization processing method provided by an embodiment of the present application;

[0048] Figure 2 Block diagram of a high - order modulation signal demodulation and equalization processing system provided by an embodiment of the present application. Detailed implementation manners

[0049] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] In the description of the present invention, the terms "including", "having" and any variations thereof are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily limit to the clearly listed steps or units, but may also include other steps or units inherent to these processes, methods, products or devices that are not explicitly listed, or steps or units added by further optimized solutions based on the concept of the present invention.

[0051] The objective of the present invention is to provide a data transmission demodulation unit test system and its equalization processing method that support high - order modulation (32APSK, 64APSK) and multi - loop targeted processing based on a distorted constellation diagram. By an improved combination equalization scheme of CMA (Constant Modulus Algorithm) and LMS (Least Mean Square Algorithm), and combined with a multi - loop targeted processing module based on a distorted constellation diagram, the problem in the prior art of being difficult to handle high - order modulation signals and complex channel distortions is solved, ensuring high demodulation performance can still be achieved under low signal - to - noise ratio conditions.

[0052] To achieve the above objective, the present invention provides the following technical solutions. Please refer to Figure 1 , which shows a flowchart of a high - order modulation signal demodulation and equalization processing method provided by an embodiment of the present application, and may include the following steps:

[0053] S1. Obtain a high - order modulation signal and perform timing recovery on the high - order modulation signal;

[0054] Timing recovery: The signal first passes through a timing synchronization module, which performs timing recovery on the signal through a specific algorithm (such as a timing recovery algorithm based on zero - crossing detection or interpolation - based), ensuring that the sampling points of the signal are aligned with the symbol boundaries. This step provides an accurate timing reference for subsequent equalization processing.

[0055] S2. Use a CMA equalizer to perform coarse equalization processing on the signal after timing recovery.

[0056] Among them, the CMA equalizer adopts a fractionally-spaced linear transversal equalizer structure, operates at twice the symbol frequency, and is used to solve non-specific channel linear distortion.

[0057] The implementation details in this step specifically include obtaining a high-order modulation signal: The receiving end captures the high-order modulation signal after channel transmission, such as 32APSK or 64APSK signals.

[0058] CMA equalizer processing: The signal after timing recovery enters the CMA equalizer. The CMA equalizer adopts a fractionally-spaced linear transversal equalizer (LTE) structure and operates at twice the symbol frequency. This structure allows signal processing at twice the symbol rate, enabling more refined signal adjustment. The CMA equalizer preliminarily corrects the amplitude distortion and group delay distortion of the signal by adjusting its weight coefficients. The algorithm of the CMA equalizer is based on the amplitude characteristics of the signal, and optimizes the weights of the equalizer by minimizing the modulus error of the signal, thereby solving non-specific channel linear distortion. The purpose of this step is to preliminarily recover the signal before carrier synchronization and reduce the threshold of carrier synchronization.

[0059] S3, The signal after coarse equalization is subjected to multi-loop targeted processing based on the distorted constellation diagram.

[0060] Among them, the multi-loop targeted processing based on the distorted constellation diagram includes performing constellation diagram analysis on the received signal and entering the multi-loop targeted processing module based on the distorted constellation diagram. The module analyzes the constellation diagram of the signal, identifies the constellation points of different loops, and performs targeted processing on the constellation points of each loop according to the distortion situation.

[0061] The implementation details in this step specifically include constellation diagram analysis: The signal after coarse equalization by the CMA equalizer enters the multi-loop targeted processing module based on the distorted constellation diagram. This module first performs constellation diagram analysis on the received signal. Constellation diagram analysis is to map the complex representation of the signal onto a two-dimensional plane to form a constellation point distribution diagram. By analyzing the distribution of constellation points, the constellation points of different loops are identified, such as the outer-loop, middle-loop, and inner-loop constellation points. The outer-loop constellation points have a larger amplitude and stronger noise resistance, the middle-loop constellation points have a moderate amplitude, and the inner-loop constellation points have a smaller amplitude.

[0062] Targeted processing: Perform targeted processing on the constellation points of each loop according to the distortion situation:

[0063] Outer-loop constellation points: Since the outer-loop constellation points have a larger amplitude and strong noise resistance, they are mainly used for frequency offset estimation and compensation. The frequency offset estimation module quickly estimates the frequency offset by analyzing the phase change of the outer-loop constellation points and compensates it before carrier synchronization.

[0064] Middle circle constellation points: The amplitude of the middle circle constellation points is moderate, mainly used for the parameter adjustment of the equalizer. By analyzing the distortion of the middle circle constellation points, the equalizer parameters are dynamically adjusted to further eliminate channel distortion.

[0065] Inner circle constellation points: The amplitude of the inner circle constellation points is small, and the anti-noise ability is poor. They are mainly used for error correction. By analyzing the error situation of the inner circle constellation points, error correction is performed to ensure the demodulation quality of the inner circle constellation points.

[0066] S4, Carrier recovery is performed on the signal after multi-loop targeted processing, and then it enters the LMS equalizer for fine equalization processing.

[0067] Among them, the LMS equalizer adopts the structure of a fractionally-spaced linear transversal equalizer, operating at 2 times the symbol frequency to eliminate inter-symbol interference and line amplifier distortion.

[0068] In this step, specifically, the signal after multi-loop targeted processing enters the carrier synchronization module for carrier recovery. The carrier synchronization module performs phase correction on the signal through specific algorithms (such as the phase-locked loop PLL or Costas loop) to ensure that the phase of the signal is aligned with the phase of the local oscillator. This step further improves the signal quality and provides an accurate phase reference for subsequent fine equalization processing.

[0069] The signal after carrier synchronization enters the LMS equalizer for fine equalization processing. The LMS equalizer also adopts the structure of a fractionally-spaced linear transversal equalizer (LTE), operating at 2 times the symbol frequency. The LMS equalizer dynamically adjusts its weight coefficients through an adaptive algorithm to further eliminate inter-symbol interference and line amplifier distortion. The algorithm of the LMS equalizer is based on the least mean square error criterion, and the weights of the equalizer are optimized by minimizing the error of the signal.

[0070] The line amplifier distortion compensation module is included in the LMS equalizer. This module includes:

[0071] S5, By analyzing the amplitude and phase changes of the signal, the equalizer parameters are dynamically adjusted to eliminate the influence of line amplifier distortion on the signal. The line amplifier distortion compensation module monitors the amplitude and phase changes of the signal in real time through an adaptive algorithm to ensure the accuracy and real-time performance of line amplifier distortion compensation. This step ensures the demodulation performance of high-order modulation signals under line amplifier distortion conditions.

[0072] The signal after fine equalization by the LMS equalizer and line amplifier distortion compensation finally enters the demodulation module to complete demodulation. The demodulation module restores the equalized signal to the original data to complete the entire demodulation process.

[0073] The following presents another alternative implementation of this application: The present invention provides a data transmission demodulation unit test system, which adopts a combined equalization scheme of improved CMA equalization and LMS equalization, and combines a multi-loop targeted processing module based on a distorted constellation diagram. The specific steps are as follows:

[0074] 1. CMA adaptive blind equalization:

[0075] a) The CMA equalizer is located after timing synchronization and before carrier synchronization. As a coarse equalizer, it is used to solve non-specific channel linear distortion, especially amplitude distortion and group delay distortion for high-order modulation signals (such as 32APSK, 64APSK).

[0076] b) The CMA equalizer adopts a fractional-spaced (FSE) linear transverse equalizer (LTE) structure, operates at 2 times the symbol frequency, and is optimized for high-order modulation signals to ensure initial signal recovery can still be achieved under low signal-to-noise ratio conditions.

[0077] c) The main function of the CMA equalizer is to ensure a low threshold for carrier synchronization and ensure initial signal recovery can still be achieved when the channel distortion is large.

[0078] 2. Multi-loop targeted processing module based on a distorted constellation diagram:

[0079] a) After the CMA equalizer, the system introduces a multi-loop targeted processing module based on a distorted constellation diagram, which is used to perform targeted processing on constellation points in different loops according to the distorted constellation diagram.

[0080] b) This module first analyzes the constellation diagram of the received signal, identifies constellation points in different loops (such as the outer loop, middle loop, inner loop), and performs different processing on the constellation points in each loop according to the distortion situation.

[0081] c) Outer loop constellation points: Since the outer loop constellation points have a large amplitude and strong noise resistance, they are mainly used for frequency offset estimation and compensation. The frequency offset estimation module quickly estimates the frequency offset by analyzing the phase change of the outer loop constellation points and compensates it before carrier synchronization.

[0082] d) Middle loop constellation points: The middle loop constellation points have a moderate amplitude and are mainly used for adjusting the parameters of the equalizer. By analyzing the distortion situation of the middle loop constellation points, the equalizer parameters are dynamically adjusted to further eliminate channel distortion.

[0083] e) Inner loop constellation points: The inner loop constellation points have a small amplitude and poor noise resistance, and are mainly used for error correction. By analyzing the error situation of the inner loop constellation points, error correction is performed to ensure the demodulation quality of the inner loop constellation points.

[0084] f) This module can perform targeted processing on the constellation points of different circles according to the distorted constellation diagram, ensuring high demodulation performance even under low signal-to-noise ratio conditions.

[0085] 3. LMS Adaptive Blind Equalization:

[0086] a) The LMS equalizer is located after carrier synchronization and serves as a fine equalizer to further solve non-specific channel linear distortion, especially inter-symbol interference and line amplifier distortion for high-order modulation signals.

[0087] b) The LMS equalizer also adopts the structure of a linear transversal equalizer (LTE) with fractional-spaced equalization (FSE), operates at twice the symbol frequency, and is optimized for high-order modulation signals and line amplifier distortion.

[0088] c) The main function of the LMS equalizer is to further improve the demodulation quality and ensure stable demodulation performance even under low signal-to-noise ratio conditions.

[0089] 4. Line Amplifier Distortion Compensation:

[0090] a) To address the line amplifier distortion problem, the system introduces a line amplifier distortion compensation module in the LMS equalizer, which performs real-time compensation for line amplifier distortion through an adaptive algorithm to ensure the demodulation performance of high-order modulation signals under line amplifier distortion conditions.

[0091] b) The line amplifier distortion compensation module analyzes the amplitude and phase changes of the signal and dynamically adjusts the equalizer parameters to eliminate the impact of line amplifier distortion on the signal.

[0092] 5. Advantages of Combined Equalization:

[0093] a) Through the combined equalization scheme of improved CMA and LMS, combined with the multi-circle targeted processing module based on the distorted constellation diagram, the system can achieve stable demodulation performance under different channel conditions, especially in the complex environment of high-order modulation signals (such as 32APSK, 64APSK) and line amplifier distortion.

[0094] b) The CMA equalizer, as a coarse equalizer, can perform preliminary recovery of the signal before carrier synchronization and reduce the threshold of carrier synchronization.

[0095] c) The multi-circle targeted processing module based on the distorted constellation diagram can perform targeted processing on the constellation points of different circles before carrier synchronization to ensure the accuracy of frequency offset estimation and the optimization of equalizer parameters.

[0096] d) The LMS equalizer, as a fine equalizer, can further eliminate inter-symbol interference and line amplifier distortion after carrier synchronization and improve the demodulation quality.

[0097] The following gives an optional implementation process:

[0098] System structure:

[0099] The data transmission demodulation unit test system includes a timing synchronization module, a CMA equalizer, a multi-loop targeted processing module based on a distortion constellation diagram, a carrier synchronization module, an LMS equalizer (including a line amplifier distortion compensation module) and a demodulation module.

[0100] The signal first passes through the timing synchronization module for timing recovery, then enters the CMA equalizer for coarse equalization, and then passes through the multi-loop targeted processing module based on the distortion constellation diagram for frequency offset estimation, equalizer parameter adjustment and error correction, and then passes through the carrier synchronization module for carrier recovery, and finally enters the LMS equalizer for fine equalization and line amplifier distortion compensation, and finally the demodulation module completes the demodulation.

[0101] Equalizer Design:

[0102] Both CMA and LMS equalizers use a fractionally spaced (FSE) linear transverse equalizer (LTE) structure, operate at twice the symbol frequency, and are optimized for high-order modulation signals and line amplifier distortion.

[0103] The parameter setting of the CMA equalizer is mainly aimed at the initial recovery of the channel linear distortion, and the parameter setting of the LMS equalizer is mainly aimed at the elimination of inter-symbol interference and line distortion.

[0104] Multi-loop targeted processing module based on distortion constellation diagram:

[0105] The multi-circle targeted processing module based on the distortion constellation diagram analyzes the constellation diagram of the received signal, identifies the constellation points of different circles (such as the outer circle, middle circle, and inner circle), and processes the constellation points of each circle differently according to the distortion situation.

[0106] The outer circle constellation points are used for frequency offset estimation and compensation, the middle circle constellation points are used for equalizer parameter adjustment, and the inner circle constellation points are used for error correction.

[0107] Line amplifier distortion compensation module:

[0108] The line amplifier distortion compensation module uses an adaptive algorithm to compensate for the line amplifier distortion in real time and dynamically adjusts the equalizer parameters to eliminate the impact of the line amplifier distortion on the signal.

[0109] This module analyzes the amplitude and phase changes of the signal and adjusts the equalizer parameters in real time to ensure the demodulation performance under the condition of line amplifier distortion.

[0110] Simulation and testing:

[0111] Through simulation analysis and actual tests, the performance of the improved combined CMA and LMS equalization scheme and the multi-loop targeted processing module based on the distorted constellation diagram under high-order modulation signals (such as 32APSK and 64APSK) and line amplifier distortion conditions was verified.

[0112] The test results show that the combined equalization scheme can effectively cope with amplitude-frequency distortion, group delay distortion, multipath effect, line amplifier distortion and frequency offset problems, ensuring high demodulation performance even under low signal-to-noise ratio conditions.

[0113] In summary, the present invention provides a data transmission demodulation unit test system and its equalization processing method that support high-order modulation (32APSK, 64APSK) and multi-loop targeted processing based on the distorted constellation diagram. Through the improved combined CMA and LMS equalization scheme, the multi-loop targeted processing module based on the distorted constellation diagram and the line amplifier distortion compensation module, it can effectively cope with various channel distortion problems and ensure high demodulation performance even under low signal-to-noise ratio conditions. This scheme has broad application prospects and is especially suitable for high-demand digital communication systems, especially in the fields of satellite communication and broadband communication.

[0114] Please refer to Figure 2 , which shows a block diagram of a high-order modulation signal demodulation and equalization processing system provided by an embodiment of the present application. The system may include:

[0115] A timing synchronization module for acquiring a high-order modulation signal and performing timing recovery on the high-order modulation signal;

[0116] A CMA equalization module for performing coarse equalization processing on the signal after timing recovery using a CMA equalizer; wherein, the CMA equalizer adopts a fractionally-spaced linear transversal equalizer structure and operates at 2 times the symbol frequency to solve non-specific channel linear distortion;

[0117] A multi-loop targeted processing module for performing multi-loop targeted processing based on the distorted constellation diagram on the signal after coarse equalization; wherein, the multi-loop targeted processing based on the distorted constellation diagram includes performing constellation diagram analysis on the received signal to enter the multi-loop targeted processing module based on the distorted constellation diagram. The module analyzes the constellation diagram of the signal, identifies the constellation points of different loops, and performs targeted processing on the constellation points of each loop according to the distortion situation;

[0118] An LMS equalization module for performing carrier recovery on the signal after multi-loop targeted processing and then entering the LMS equalizer for fine equalization processing; wherein, the LMS equalizer adopts a fractionally-spaced linear transversal equalizer structure and operates at 2 times the symbol frequency to eliminate inter-symbol interference and line amplifier distortion.

[0119] The system further includes:

[0120] The line amplifier distortion compensation module is used to analyze the amplitude and phase changes of the signal after carrier recovery and extract the characteristic parameters related to the line amplifier distortion;

[0121] According to the extracted characteristic parameters, the weight coefficients of the LMS equalizer are dynamically adjusted through an adaptive algorithm to compensate for the line amplifier distortion in real time;

[0122] During the compensation process, the amplitude and phase changes of the signal are continuously monitored to ensure the accuracy and real-time performance of the line amplifier distortion compensation.

[0123] For the specific limitations of the high-order modulation signal demodulation and equalization processing system, reference can be made to the limitations of the high-order modulation signal demodulation and equalization processing method in the above text, which will not be elaborated here. Each module in the above high-order modulation signal demodulation and equalization processing system can be implemented in whole or in part by software, hardware, and their combination. The above-mentioned modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.

[0124] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored, covering all or part of the processes in the method of the above embodiment.

[0125] In one embodiment, a computer program product is further provided, including a computer program / instructions, covering all or part of the processes in the method of the above embodiment.

[0126] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in M forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Symchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0127] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0128] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for demodulating and equalizing a high-order modulation signal, characterized in that The method includes: Obtain a high - order modulation signal and perform timing recovery on the high - order modulation signal; Use a CMA equalizer to perform coarse equalization processing on the signal after timing recovery; wherein, the CMA equalizer adopts a fractional - interval linear transversal equalizer structure, operates at 2 times the symbol frequency, and is used to solve non - specific channel linear distortion; The signal after coarse equalization is subjected to multi - loop targeted processing based on the distorted constellation diagram; wherein, the multi - loop targeted processing based on the distorted constellation diagram includes performing constellation diagram analysis on the received signal to enter the multi - loop targeted processing module based on the distorted constellation diagram. The module analyzes the constellation diagram of the signal, identifies constellation points in different loops, and performs targeted processing on the constellation points in each loop according to the distortion situation; Carry out carrier recovery on the signal after multi - loop targeted processing, and then enter the LMS equalizer for fine equalization processing; wherein, the LMS equalizer adopts a fractional - interval linear transversal equalizer structure, operates at 2 times the symbol frequency, and eliminates inter - symbol interference and line amplifier distortion; The entering the LMS equalizer for fine equalization processing further includes: Analyze the amplitude and phase changes of the signal after carrier recovery, and extract characteristic parameters related to line amplifier distortion; According to the extracted characteristic parameters, dynamically adjust the weight coefficients of the LMS equalizer through an adaptive algorithm to compensate for line amplifier distortion in real - time; During the compensation process, continuously monitor the amplitude and phase changes of the signal to ensure the accuracy and real - time nature of line amplifier distortion compensation, thereby ensuring the demodulation performance of the high - order modulation signal under line amplifier distortion conditions; The multi - loop targeted processing based on the distorted constellation diagram specifically includes: Perform constellation diagram analysis on the received signal to identify constellation points in different loops, including outer - loop, middle - loop, and inner - loop constellation points; Perform frequency offset estimation and compensation on the outer - loop constellation points, and quickly estimate the frequency offset by analyzing the phase changes of the outer - loop constellation points; Adjust the equalizer parameters for the middle - loop constellation points, and dynamically adjust the equalizer parameters according to the distortion situation of the middle - loop constellation points; Perform error correction on the inner - loop constellation points, and ensure the demodulation quality by analyzing the error situation of the inner - loop constellation points.

2. The high-order modulation signal demodulation and equalization processing method according to claim 1, characterized in that The carrier recovery specifically includes: Perform phase correction on the signal to ensure that the phase of the signal is aligned with the phase of the local oscillator; During the carrier synchronization process, use the signal after coarse equalization and multi - loop targeted processing to further improve the accuracy of phase correction.

3. The high-order modulation signal demodulation and equalization processing method according to claim 1, wherein The fine equalization processing of the LMS equalizer specifically includes: Adopt a fractional - interval linear transversal equalizer structure and operate at 2 times the symbol frequency; Dynamically adjust the weight coefficients of the equalizer through an adaptive algorithm to eliminate inter - symbol interference and line amplifier distortion; The LMS equalizer includes a line amplifier distortion compensation module, which analyzes the amplitude and phase changes of the signal and adjusts the equalizer parameters in real - time to compensate for line amplifier distortion.

4. The high-order modulation signal demodulation and equalization processing method according to claim 1, wherein The method further includes: After the LMS equalizer, demodulate the signal after fine equalization processing to recover the original data; During the demodulation process, use the signal after carrier recovery and fine equalization processing to ensure the accuracy and stability of demodulation.

5. A high-order modulation signal demodulation and equalization processing system, characterized in that, The system includes: A timing synchronization module, which is used to obtain a high - order modulation signal and perform timing recovery on the high - order modulation signal; CMA equalization module, which is used to perform coarse equalization processing on the signal after timing recovery by using a CMA equalizer; wherein, the CMA equalizer adopts a fractionally-spaced linear transversal equalizer structure and operates at 2 times the symbol frequency to solve non-specific channel linear distortion; Multi-loop targeted processing module, which is used to perform multi-loop targeted processing based on the distorted constellation diagram on the signal after coarse equalization; wherein, the multi-loop targeted processing based on the distorted constellation diagram includes performing constellation diagram analysis on the received signal to enter the multi-loop targeted processing module based on the distorted constellation diagram, and the module analyzes the constellation diagram of the signal, identifies the constellation points of different loops, and performs targeted processing on the constellation points of each loop according to the distortion situation; LMS equalization module, which is used to perform carrier recovery on the signal after multi-loop targeted processing, and then enter the LMS equalizer for fine equalization processing; wherein, the LMS equalizer adopts a fractionally-spaced linear transversal equalizer structure and operates at 2 times the symbol frequency to eliminate inter-symbol interference and line amplifier distortion; The system further includes: Line amplifier distortion compensation module, which is used to analyze the amplitude and phase changes of the signal after carrier recovery and extract the characteristic parameters related to line amplifier distortion; According to the extracted characteristic parameters, dynamically adjust the weight coefficients of the LMS equalizer through an adaptive algorithm to compensate for line amplifier distortion in real time; During the compensation process, continuously monitor the amplitude and phase changes of the signal to ensure the accuracy and real-time performance of line amplifier distortion compensation; The multi-loop targeted processing based on the distorted constellation diagram specifically includes: Performing constellation diagram analysis on the received signal to identify the constellation points of different loops, including the outer-loop, middle-loop, and inner-loop constellation points; Performing frequency offset estimation and compensation on the outer-loop constellation points, and quickly estimating the frequency offset by analyzing the phase changes of the outer-loop constellation points; Adjusting the equalizer parameters for the middle-loop constellation points, and dynamically adjusting the equalizer parameters according to the distortion situation of the middle-loop constellation points; Performing error correction on the inner-loop constellation points, and ensuring the demodulation quality by analyzing the error situation of the inner-loop constellation points.

6. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer program product comprising computer programs / instructions, characterized in that, When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

Images