43 results about "Symbol synchronization" patented technology

The invention relates to the technical field of semiconductor radio frequency signal processing, and discloses a narrowband signal receiving system and method, and the system comprises a coarse frequency offset value capturing module, a carrier phase locking module, a digital domain carrier tracking module, a timing synchronization and multipath correction module, and a vector amplitude phase correction and equalization module. In the prior art, the technical problems of lock losing, judgment errors and high bit error rate caused by serious multipath interference and frequency offset drifting of narrow-band signals are difficult to solve in complex environments with multipath effect and high frequency offset, such as urban canyons, basements and warehouses. According to the invention, by introducing analog phase locking, digital fine tuning, dual-correlation symbol synchronization based on multi-path sensing and vector amplitude-phase combined compensation overall architecture with cooperation of analog and digital, the problems of synchronization failure and demodulation performance reduction caused by multi-path distortion in the prior art are avoided; and the sensitivity and the overall reliability of radio frequency signal receiving are remarkably improved.

Methods, systems, and devices for a wakeup receiver operation is described. A receiver may include a conversion circuit that converts an RF signal to a baseband signal, where the baseband signal comprise a set of symbols received at a symbol rate. The receiver may include an analog-to-digital converter that converts the baseband signal to samples at a sample rate greater than the symbol rate. The receiver may include a set of correlators, each correlator of the set may receive a respective subset of the samples of the baseband signal and generate a respective output. The receiver may include a compare circuit that receives the respective outputs from the set of correlators and compares the respective outputs with a threshold, where the compare circuit also generates a wakeup command based at least in part on at least one output of the respective outputs satisfying the threshold.

The invention discloses a front-feedback combined burst signal fast symbol synchronization method, which relates to the technical field of digital signal processing and satellite communication, and comprises the following steps: firstly, sampling a received signal subjected to matched filtering processing according to a 4-time symbol rate by using an initial NCO (Network Controlled Oscillator), then dividing a sampling value into two paths, sending one path to an FIFO (First In First Out) register for caching, and using Oamp in the other path; the method comprises the following steps of: firstly, performing timing deviation estimation by using an FIFO (First In First Out) register and an M algorithm, secondly, determining a moment when the FIFO register starts to read data, an oscillation initial value of an interpolation control NCO and an initial value of an interpolation coefficient according to a timing deviation estimation result, starting the interpolation control NCO, and then, sending the data read by the FIFO register into a Farrow structure interpolation filter for interpolation processing according to the initial value of the interpolation coefficient. And finally, a Gardner loop is started, feedback control is carried out on the interpolation control NCO, and an interpolation result is output, so that the fast symbol synchronization speed and precision of the burst signal are improved, and the stability and timeliness of fast symbol synchronization of the burst signal are guaranteed.

This application provides a method, apparatus, and storage medium for vehicle-to-everything (V2X) symbol synchronization, relating to the field of communication technology. It addresses the problem of poor reliability and accuracy of traditional symbol synchronization algorithms in high-frequency bias and low signal-to-noise ratio (SNR) LTE-V2X practical communication scenarios. The method includes: performing coarse synchronization processing on the received baseband V2X signal and local synchronization signal to obtain a coarse synchronization point; calculating a frequency offset estimate based on the local synchronization signal and the coarsely synchronized baseband V2X signal, and using the frequency offset estimate to compensate the local synchronization signal; based on the coarse synchronization point, extracting the unsampled baseband V2X signal from the received baseband V2X signal; and performing fine synchronization processing on the unsampled baseband V2X signal and the frequency offset-compensated local synchronization signal to obtain a fine synchronization point. The embodiments of this application are used in the process of V2X symbol synchronization.

The invention discloses a service-adaptive satellite-borne non-uniform multicarrier demodulation device, and belongs to the field of digital signal processing. The method comprises the following steps of: firstly, performing orthogonal down-conversion and resampling filtering processing on a digital intermediate frequency signal sampled by an ADC (Analog to Digital Converter), processing the digital intermediate frequency signal by a non-uniform channelization splitter, and then serially outputting the digital intermediate frequency signal to a spread spectrum ratio self-adaptive variable burst capturer according to fixed quadruple sampling to capture a leading head and identify the spread spectrum ratio; the method comprises the following steps: completing symbol synchronization and de-spreading processing on an input signal according to a spread spectrum ratio, then completing carrier coarse synchronization and pattern word identification, completing modulation mode identification and carrier synchronization according to a pattern word, performing channel decoding through a multi-mode decoder to recover to an information bit stream, and outputting the information bit stream. And the information bit stream is sent to a service frame recombination processor for search identification and recombination splicing, and output is carried out after whole-frame CRC check is carried out. The method has the advantages of flexibility in use, low resource occupation and capability of realizing adaptive demodulation of variable-rate, multi-modulation-mode and multi-coding-mode service transmission signals without parameter configuration.

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication method, device and system, and the method comprises the steps: generating a transmission frame which comprises a plurality of OFDM symbols; a first OFDM symbol of the transmission frame is a synchronous pilot symbol, and a second OFDM symbol is a reference pilot symbol; based on the transmission frame, configuring at least two demodulation modes according to channel conditions or communication requirements; when the first demodulation mode is configured, the receiving end performs differential phase shift keying differential demodulation on subsequent data symbols based on the reference pilot symbols; and when a second demodulation mode is configured, the receiving end performs channel estimation by using the reference pilot symbol, and performs quadrature amplitude modulation equalization and demodulation on subsequent data symbols according to a channel estimation result. According to the invention, ultralow pilot frequency overhead can be realized, the pilot frequency overhead is compressed to only two symbols, a synchronization sequence and a reference pilot frequency sequence in each frame, and the frequency spectrum utilization rate is greatly improved.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a one-symbol primary synchronization signal (PSS) over a set of tones in a frequency domain. The UE may monitor for a three-symbol synchronization signal block (SSB) based at least in part on whether a group of resource blocks (RBs) includes at least one of an SSB identifier associated with the three-symbol SSB or offset information. Numerous other aspects are described.

The invention relates to the technical field of signal transmission, and particularly discloses a wireless temperature and humidity sensing method and system for an industrial site, and the method comprises the steps: achieving the dynamic generation of a frequency hopping sequence driven by a single-frame snapshot through building a millisecond-level disturbance feature sensing channel; a frequency point stability weighting factor is constructed in combination with judgment reliability feedback, so that frequency point selection gives consideration to an instantaneous state and historical performance; a frequency point marking preamble extension section and cross-frame trend tracking are further introduced, so that the synchronization efficiency of a receiving end is improved, and sequence evolution has inherent continuity; finally, the context is solidified in the node dormancy awakening process, and the availability of the first frame under intermittent communication is guaranteed. Therefore, the destructive effect of broadband electromagnetic pulses on lead code capture and symbol synchronization is effectively suppressed, the first frame data packet loss rate and the CRC verification failure probability are remarkably reduced, and the transmission robustness and the time certainty of temperature and humidity sensing data in a strong interference industrial environment are improved.

The invention discloses a signal modulation analysis and data recovery method and system based on a zero-span mode, and provides a complete process which can complete FSK / ASK modulation signal identification and original binary data recovery only by using a general frequency spectrograph without special demodulation hardware. Low-cost and high-compatibility signal analysis is realized through a five-step method of frequency domain scanning, modulation identification, zero-span time domain observation, symbol synchronization and decision reduction, and frequency information is converted into a waveform of which the amplitude changes along with time by utilizing a zero-span mode of a frequency spectrograph, so that a common engineer can also intuitively observe and decode a digital modulation signal, and the accuracy of the digital modulation signal is improved. Symbol-level time synchronization and automatic judgment threshold setting are realized, and the accuracy and repeatability of data reduction are remarkably improved.

The application discloses a time-frequency synchronization method of a non-cooperative OFDM communication system, a blind synchronization algorithm of cyclic prefix autocorrelation is used to perform initial frame synchronization on a received signal to realize frame header positioning, a sliding correlation window is used to position a time domain position of a synchronization sequence of the received signal, clustering decision is performed on the synchronization sequence in continuous multiple frames of signals, and an initial synchronization sequence is extracted through autocorrelation peak value statistics of multiple frame decision results. According to autocorrelation characteristics and cycle characteristics of the synchronization sequence, the application provides a fast symbol synchronization and optimal sampling point synchronization method, and frequency offset estimation is realized based on a Moose algorithm. After the received signal is subjected to time-frequency synchronization, the synchronized sequence is fed back to the clustering decision step to perform iterative updating on a local synchronization sequence, and the overall system performance is further improved.

This application relates to a decoding path determination method, apparatus, computer device, and storage medium. The method includes: constructing a symbol-based equivalent directed graph based on a polar code generator matrix; obtaining at least two initial symbol synchronization sets based on the equivalent directed graph; optimizing each initial symbol synchronization set based on frozen symbols in each initial symbol synchronization set and information symbols in a preset set to obtain an optimized symbol synchronization set; and determining the target decoding path based on the optimized symbol synchronization set. This method optimizes the symbol enumeration order, improves path evaluation at each decoding level, and further optimizes the enumeration order of symbols in the optimized symbol synchronization set, resulting in a more accurate final target decoding path.

This invention provides a 100G coherent acquisition closed-loop demodulation method and system integrating TIADC and demodulation, belonging to the field of digital signal processing. The method includes: TIADC mismatch correction, frame synchronization and symbol synchronization, resampling clock recovery, frequency domain full dispersion compensation, three-level polarization demultiplexing (CMA+LMS+DDLMS), joint carrier frequency offset estimation and compensation, Viterbi-Viterbi carrier phase recovery, soft decision and full performance monitoring. This invention is the first to use TIADC front-end correction as the first stage of demodulation, achieving deep integration of acquisition and demodulation. The three-level cascaded equalization architecture balances convergence speed and compensation accuracy. A joint carrier recovery closed loop is established through phase residual feedback, significantly improving demodulation robustness and accuracy. This method can output full test indicators in real time, uses FPGA parallel pipelines to reduce processing latency, and is suitable for engineering applications such as 100G coherent acquisition cards and optical communication test instruments.

The embodiment of the invention provides a synchronization implementation method for a low-orbit satellite terminal receiver, and relates to the technical field of wireless communication, and the method comprises the steps: carrying out the frame header detection of a received baseband signal through employing a superframe header sequence and a posterior detection integral algorithm, and obtaining a superframe signal; performing digital AGC on the superframe signal; performing frequency offset estimation and compensation on the superframe signal after the digital AGC; performing frame tail detection on the compensated super-frame signal by using a local lead code sequence and a posterior detection integral algorithm to obtain a super-frame symbol; segmenting the superframe symbol, and estimating a timing error of segmented data; performing symbol segmentation processing according to the timing error; performing symbol interpolation on the data subjected to symbol segmentation; and carrying out symbol synchronization output control and superframe length limitation on the data subjected to symbol interpolation. The method can solve the problems of frame synchronization, frequency offset estimation and compensation, symbol timing and symbol synchronization.

This invention discloses an adaptive link transmission method for airborne missile swarm networks, comprising: receiving a signal and then digitally down-converting it to obtain sampled data; passing the sampled data through a correlator to obtain a coherently demodulated data sequence; performing an N-point FFT spectral analysis on the obtained coherently demodulated data sequence to obtain the carrier frequency offset; after the FFT spectral analysis, detecting whether spectral peaks appear in the spectral analysis results, making an acquisition decision, and thus completing coarse synchronization; after the signal is acquired, calculating the peak values ​​of the corresponding power spectrum of the acquired signal, and finding the maximum value of these peaks, with the sampling point corresponding to this maximum peak value being the fine synchronization point; through the above steps, fast frame synchronization, precise symbol synchronization, and initial frequency offset estimation are performed on the signal. This invention achieves efficient and reliable communication of airborne missile swarms in complex electromagnetic environments by combining correlation-based FFT fast acquisition and synchronization technology and spatial diversity reception technology.

The invention provides a satellite signal symbol level processing method and electronic equipment. The method comprises the following steps: firstly, carrying out matched filtering processing on baseband oversampling data, and carrying out oversampling processing on a local synchronization head sequence to obtain a local oversampling synchronization head sequence; performing pairwise conjugation processing on the local oversampling synchronous head sequence to obtain a local synchronous head differential sequence, performing differential correlation on the local synchronous head differential sequence and a baseband oversampling differential sequence obtained after pairwise conjugation processing on baseband oversampling data to obtain a cross-correlation sequence, and taking out the baseband oversampling synchronous head differential sequence to obtain a local synchronous head sequence; and calculating a compensation frequency offset value based on the phase deviation between the local synchronization head differential sequence and the local synchronization head differential sequence to carry out frequency offset compensation, and carrying out symbol synchronization processing and carrier recovery processing on each frame of data after frequency offset compensation in parallel, thereby improving the satellite signal processing efficiency, effectively resisting the influence of large frequency offset, and improving the satellite signal quality. The problem that the estimation accuracy of blind frequency offset estimation is reduced during low signal-to-noise ratio or high-order modulation is solved.

The invention discloses a medical Internet of Things human body local area network baseband processing method and system, and the method comprises the steps: S1, carrying out the preprocessing of collected medical data through a transmitting end baseband module, obtaining modulation data, and transmitting the modulation data to a control module; s2, a receiving end baseband module receives the data sent by the control module, samples the data, calculates the peak value of the sampled data, and judges whether the sampled data is modulation data according to the peak value, if yes, the step S3 is executed, and if not, data receiving and sampling are continued; s3, calculating the frequency offset of the modulation data, generating a compensation signal according to the frequency offset, and compensating the modulation data to obtain a corrected modulation signal; s4, performing symbol synchronization on the corrected modulation data to obtain synchronous modulation data; and S5, decoding the synchronous modulation data, and outputting restored medical data.

The application discloses a signal processing method of power carrier communication based on OFDM modulation, relates to the technical field of power carrier communication, and comprises the following steps: S1, cyclic prefix and guard interval design and insertion; S2, improved synchronization algorithm for frequency offset processing; S3, noise suppression optimization of a front-end signal processing module; S4, parallel processing architecture design and task allocation; S5, channel estimation at a receiving end; S6, frequency domain equalization processing; S7, OFDM demodulation processing; and S8, symbol synchronization and data recovery. Through the steps S1 and S2, the effects of effectively resisting power line channel multipath delay, reducing inter-symbol interference and inter-carrier interference are achieved. Through the steps S3, S5 and S6, the effects of accurately identifying power line impulse noise and Gaussian noise characteristics and dynamically suppressing noise are achieved. Through the steps S4 and S8, the effects of improving signal processing efficiency by using a parallel processing architecture and avoiding processor overload are achieved, and meanwhile, the data error correction capability is enhanced by convolution coding or Turbo coding, so that the real-time performance and reliability of high-speed data transmission are ensured.

The application provides a synchronization method of an OFDM system based on a ZC sequence, which comprises the following steps: firstly, constructing two ZC sequences ZC1 and ZC2 with different roots; then, taking values of the ZC1 sequence and the ZC2 sequence and arranging them to obtain a training sequence; transforming the training sequence through IFFT; adding a cyclic prefix to a data frame; then, sending the training sequence out from a sending end and transmitting the training sequence through a channel; calculating the cross-correlation of data of a receiving end and a local training sequence; finally, selecting a symbol synchronization position according to the cross-correlation calculation value; and after the synchronization position is determined, estimating a carrier frequency offset. The application scheme can satisfy accurate symbol synchronization and frequency offset estimation in a large-fading and low-signal-to-noise-ratio wired channel environment, enhances the reliability of synchronization and reduces the operation amount.

The application discloses a wireless local area network terminal time domain wake-up method, system, device and storage medium, and belongs to the technical field of wireless communication. The method comprises the following steps: an access point (AP) allocates a unique cyclic prefix (CP) length to each wireless terminal, and establishes a mapping table of the CP length and the wireless terminal; when a wake-up signal is sent, the AP adds a CP with a corresponding length to a selected OFDM short training sequence according to the CP length of a target wireless terminal; when the wireless terminal is in a silent state, only a front-end radio frequency part is used to collect air interface wireless time domain signals, window sliding calculation is performed on the collected wireless time domain signals, and a symbol synchronization point is judged through a Schmidl algorithm; the wireless terminal counts the number of continuous symbol synchronization points, obtains the CP length, compares the CP length with the CP length allocated by the wireless terminal, and if the CP lengths are equal, the wireless terminal exits the silent state and is woken up. The application can realize fast wake-up while keeping low power consumption, and avoids additional hardware.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a one-symbol primary synchronization signal (PSS) over a set of tones in a frequency domain. The UE may monitor for a three-symbol synchronization signal block (SSB) based at least in part on whether a group of resource blocks (RBs) includes at least one of an SSB identifier associated with the three-symbol SSB or offset information. Numerous other aspects are described.

The application discloses a symbol synchronization method for super-nyquist transmission signals and belongs to the technical field of wireless communication. The method comprises the following steps: setting the sampling time of the peak point, the front zero-crossing point and the rear zero-crossing point of a current symbol, and sampling the signal; calculating the relative error rates of the front zero-crossing point and the peak point and the relative error rates of the rear zero-crossing point and the peak point, and calculating the difference between the two relative error rates; determining the adjustment direction of the sampling time of the current symbol according to the difference, dynamically adjusting the sampling time of the subsequent symbol, realizing symbol synchronization, and outputting the data of the peak point as an output signal. The application uses the relative error rate difference between the front zero-crossing point, the rear zero-crossing point and the peak point to determine whether the sampling point is ahead or behind, thereby dynamically adjusting the sampling time, realizing the symbol synchronization of the system, and solving the symbol synchronization problem of the super-nyquist transmission system caused by the inter-symbol interference.

This invention relates to the field of wireless communication technology, specifically disclosing a soft-decision method for GFSK signals based on multi-sampling point adaptive weighting. The method includes: extracting phase change features from the I / Q signal and performing three-level anti-interference processing to obtain an optimized phase difference sequence; performing frequency offset correction and symbol synchronization on the optimized phase difference sequence based on a predefined local ZC preamble sequence and a local gold code sequence in the frame structure; selecting three sampling points (middle, left, and right) from eight times the oversampling points in each symbol period; performing interference compensation on the data from the three sampling points and then weighting and fusing them to obtain a weighted fused sequence; constructing a reference sequence based on the local gold code sequence, and calculating the log-likelihood ratio between the reference sequence and the weighted fused sequence bit by bit as the soft decision value; and performing subsequent decoding based on the soft decision value. This invention can stably reduce the bit error rate and maximize the system coding gain in low signal-to-noise ratio and multipath interference scenarios.

The application relates to the field of digital signal processing, in particular to a symbol synchronization method suitable for a wired communication system of THP, a feedforward transversal filter FFE is used to pre-process baseband receiving symbols, phase discrimination processing is carried out on the symbols processed by the FFE, in the phase discrimination processing part, an estimated value of the current receiving symbol is obtained through modulo operation and decision, an error between the receiving symbol and the estimated value is calculated, threshold comparison and compensation are carried out on the error, sampling phase deviation information is obtained by correlating the compensated error with an expected symbol; finally, the sampling deviation information is processed by using a direct path and an integral path of a loop filter, and is used for controlling a numerically controlled oscillator NCO to adjust a next sampling position. The sampling phase error information is processed in a linear domain, the influence of nonlinear modulo operation of THP on the phase discrimination algorithm is avoided, the stability of the symbol synchronization method is improved, and low calculation complexity is maintained.

This invention provides a 100G coherent acquisition closed-loop demodulation method and system integrating TIADC and demodulation, belonging to the field of digital signal processing. The method includes: TIADC mismatch correction, frame synchronization and symbol synchronization, resampling clock recovery, frequency domain full dispersion compensation, three-level polarization demultiplexing (CMA+LMS+DDLMS), joint carrier frequency offset estimation and compensation, Viterbi-Viterbi carrier phase recovery, soft decision and full performance monitoring. This invention is the first to use TIADC front-end correction as the first stage of demodulation, achieving deep integration of acquisition and demodulation. The three-level cascaded equalization architecture balances convergence speed and compensation accuracy. A joint carrier recovery closed loop is established through phase residual feedback, significantly improving demodulation robustness and accuracy. This method can output full test indicators in real time, uses FPGA parallel pipelines to reduce processing latency, and is suitable for engineering applications such as 100G coherent acquisition cards and optical communication test instruments.

The invention discloses an IQ imbalance estimation and compensation method based on a constellation diagram, and belongs to the technical field of wireless communication signal processing. The method comprises the following steps: preprocessing a received signal, including frequency offset compensation, power normalization, matched filtering, symbol synchronization and phase correction; extracting constellation points of the demodulated signals, and mapping the constellation points to ideal constellation points; respectively constructing an amplitude error function and a phase error function, and estimating an IQ amplitude imbalance factor and a phase imbalance factor with high precision by using a least square method; and finally, compensating a received signal by using the estimated factor, and correcting a distorted constellation diagram. The core of the method is that low-complexity and high-precision IQ imbalance blind estimation and compensation can be realized only by using demodulated constellation point information without depending on a training sequence or pilot frequency, the bit error rate of the system is effectively reduced, and the method is particularly suitable for burst communication and high-order modulation systems.

The application provides a residual frequency offset and phase offset joint estimation method and device based on linear fitting, which comprises the following steps: obtaining symbol data after symbol synchronization based on a preset target modulation mode, obtaining a signal model based on the symbol data, obtaining a continuous phase sequence of the signal model, performing linear fitting based on the continuous phase sequence, calculating a residual frequency offset estimation value, compensating the signal model based on the residual frequency offset estimation value to obtain a target signal model after residual frequency offset compensation, performing operation on the target signal model and solving to obtain a phase value of each symbol sample, taking an average value of the phase value of each symbol sample to obtain a final initial phase offset estimation value, and performing phase compensation on the target signal model based on the initial phase offset estimation value to obtain target symbol data after final carrier synchronization.

The application discloses a digital circuit demodulation and decoding method, device and equipment and a storage medium. The method is applied to a tag receiver and comprises the following steps: acquiring a downlink signal of a digital circuit, wherein the downlink signal comprises a pilot sequence and an effective signal; performing frame synchronization detection on the pilot sequence to determine a pilot end position, thereby indirectly determining the start and end of the effective data; acquiring a symbol length, performing symbol synchronization detection on a pilot position sequence interval according to the symbol length to determine a best decision time sequence; and determining a decoding value of the effective signal according to the best decision time sequence. The pilot position sequence interval is acquired by performing frame synchronization detection on the pilot sequence, and then the best decision time sequence is determined by combining the symbol length to perform symbol synchronization detection, so that the tag receiver can accurately locate the signal, the decoding error caused by synchronization deviation is reduced, the tag receiver can adapt to complex working conditions, and the anti-interference capability is enhanced. By locating the best decision time, the decoding value can be quickly determined, and redundant operation is reduced.

The invention discloses an orthogonal time-frequency-space transceiver suitable for a satellite-ground scene, and relates to the technical field of satellite communication, in particular to the orthogonal time-frequency-space transceiver suitable for the satellite-ground scene. The invention aims to solve the problem that the bit error rate is too high. The method comprises the following steps of: 1, enabling transmission data to sequentially pass through a convolutional coding module, an interleaving module, a scrambling module, a QAM (Quadrature Amplitude Modulation) module, an OTFS (Over the Top File System) module and a CP (Content Program) adding module, and inserting DMRS (Demodulation Reference Signal) into output data of the 2, framing a data symbol, an information symbol and a leader sequence; 3, the framed data sequentially pass through a DAC and an antenna to enter a time-frequency double-selection channel, an antenna on the other FPGA receives a signal, then the signal passes through an ADC to reach a frame synchronization module, output data are sequentially input into CFO frequency offset estimation and correction, symbol synchronization, CP removal, FFT, channel estimation and equalization, inverse two-dimensional Fourier transform, information symbol solution, QAM demodulation, descrambling, de-interleaving and de-convolution coding modules, and then the output data are sent to a frame synchronization module. And the received 01 sequence is obtained.

This invention discloses a MAPSK blind equalization method and system suitable for complex channel environments with low signal-to-noise ratios (SNR). The system includes: a transverse filter with multiple taps that receives a MAPSK signal sequence after symbol synchronization processing; an error calculator that calculates the amplitude and / or phase error of the signal based on the output of the transverse filter; and a weight vector updater that updates the weights of the transverse filter taps based on the calculated error. The blind equalization method of this invention can converge quickly in low SNR and complex channel environments, significantly improving the communication quality and reliability of satellite communications.

This invention discloses a low-complexity symbol synchronization method and system. The method includes: S1, preprocessing the received signal; S2, inputting the preprocessed signal to the adaptive equalizer of the adaptive equalization module for equalization processing. The adaptive equalizer equalizes the signal by updating the tap weights. In the steady-state phase, its tap weight distribution tracks the fractional delay changes caused by SFO (Segmented Time Delay); S3, monitoring the amplitude changes of each tap weight in the adaptive equalization module in real time and recording the position of the tap with the maximum weight; S4, when the offset of the position of the tap with the maximum weight relative to a preset position exceeds a preset threshold, it is determined that the symbol timing has generated cumulative symbol timing drift, triggering the symbol synchronization operation; S5, executing and completing symbol synchronization. Its advantages are: this method reuses an existing adaptive equalizer, using its weight distribution as a direct observation of the synchronization state, significantly reducing FPGA resource consumption.