89 results about "Symbol synchronization" patented technology

The invention belongs to the technical field of signal processing, and provides a blind demodulation method and device for a wireless signal, and the method comprises the steps: screening out a candidate modulation type from a plurality of modulation types according to the time domain features in the wireless signal; for each candidate modulation type, estimating a target parameter of the IQ data in the wireless signal corresponding to the candidate modulation type to obtain a target parameter estimation result; performing symbol synchronization processing on the target parameter estimation result to obtain a symbol synchronization point; calculating EVM (Error Vector Magnitude) corresponding to the candidate modulation type according to the symbol synchronization point, and determining the candidate modulation type corresponding to a minimum value as a target modulation type under the condition that the minimum value in the EVM corresponding to each candidate modulation type is smaller than or equal to an EVM threshold value; and demodulating the wireless signal based on the target modulation type to obtain a demodulation result. According to the method provided by the invention, the blind demodulation efficiency and accuracy of the composite modulation signal in a complex channel or a low signal-to-noise ratio environment are improved.

The invention provides a digital receiver circuit and a control method thereof. The digital receiver circuit comprises a frame synchronization detection module, a symbol synchronization detection module and a symbol decoding module, the frame synchronization detection module comprises a first matched filter and a first peak detection module; the first matched filter is used for performing convolution operation on a guide code sequence in the received synchronization signal to obtain a convolution operation result; the first peak value detection module is used for determining the position of a convolution peak value according to the convolution operation result; determining the end position of the guide code sequence according to the position of the convolution peak value; the symbol synchronization detection module is used for detecting positioning information of an end position of each symbol in effective data connected with the guide code sequence; according to the positioning information, determining a pulse sequence corresponding to a judgment moment of symbol decoding of the effective data; and the symbol decoding module is used for performing symbol decoding on the effective data according to the judgment time and the pulse sequence. The technology can improve the accuracy of signal detection and decoding.

The invention discloses a parallel transmission method from WiFi to LoRa, Bluetooth and ZigBee based on cross-protocol communication, which comprises the following steps: uniformly up-sampling wireless heterogeneous signals to the same sampling rate through a CCK symbol synchronization mechanism; generating a compensation carrier based on the estimated frequency offset, completing frequency band migration of different wireless heterogeneous signals according to the compensation carrier so as to place different signals on different carrier frequencies, and directly adding the generated wireless heterogeneous signals with different carrier frequencies in a time domain to obtain a mixed signal; and performing reverse engineering simulation on the mixed signal to obtain a WiFi signal carrying information of a plurality of wireless devices, performing scrambling processing on the WiFi signal, converting a scrambled bit stream into a radio frequency signal through a CCK modulator, and transmitting the radio frequency signal through an antenna. According to the invention, direct communication from WiFi to a plurality of Internet of Things devices can be realized.

The invention discloses an MAPSK blind equalization method and system suitable for a low signal-to-noise ratio complex channel environment. The system comprises a transverse filter, an error calculator and a weight vector updater, wherein the transverse filter is used for receiving an MAPSK signal sequence subjected to symbol synchronization processing and is provided with a plurality of taps, the error calculator is used for calculating the amplitude and / or phase error of a signal according to the output of the transverse filter, and the weight vector updater is used for updating the weights of the taps of the transverse filter according to the calculated error. According to the blind equalization method provided by the invention, rapid convergence can be realized in a low signal-to-noise ratio and complex channel environment, and the communication quality and reliability of satellite communication can be remarkably improved.

The invention discloses a low-power-consumption Bluetooth weak link communication method and device based on adaptive symbol extension and DNN demodulation technology, and the method comprises the steps: measuring a channel environment of a transmitting end, judging a current channel environment through transmitting different extension factors and data packet lengths, and determining an optimal symbol extension factor; sending data of a sending end, and after the optimal symbol expansion factor is determined, expanding a data packet and segmenting the data by a transmitter, and carrying out data de-whitening operation; a receiving end captures a BLE signal, captures the signal and preprocesses the signal; identifying a receiving end and positioning a BLE data packet, detecting a data packet preamble based on phase peak clustering, identifying the data packet and synchronizing symbols; and a receiving end demodulates the BLE signal to obtain final BLE data, and demodulates the wireless signal by adopting a demodulator based on a time-frequency domain combined DNN model. According to the invention, stable BLE communication can be maintained in a low signal-to-noise environment, the method is widely supported in commercial BLE chip equipment, the equipment does not need to be modified, and the communication capability of the BLE equipment in a weak link is improved.

The invention relates to a motion MPSK communication radiation source speed estimation method. The method comprises the following steps of: firstly, dividing a received MPSK signal into two paths, estimating motion phase deviation in one path by utilizing a minimum mean square error phase discrimination algorithm, compensating the motion phase deviation and demodulating a message symbol carried by the signal; carrying out signal segmentation on the other MPSK signal according to symbol synchronization information and a symbol period, and compensating a phase of a symbol waveform corresponding to a demodulated message symbol according to the demodulated message symbol; and finally, combining symbol waveform data after phase compensation into a two-dimensional matrix, and solving Doppler frequency for data of different symbols at the same sampling moment through a vertical Fourier transform method so as to obtain the speed of a moving target. Compared with a traditional sensing integrated speed measurement method, the method has the advantages of being low in probability of being found and long in operating distance.

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.

The present invention discloses a detection and synchronization method and system for M110-39T based on signal time-frequency characteristics, belonging to the field of short-wave communication technology. It includes: using a frequency-domain peak template to perform a sliding search on the signal to complete signal presence detection and carrier synchronization, where the frequency-domain peak template is constructed comprehensively based on the first-stage pre-synchronization code and Doppler tone of the M110-39T signal; using a time-domain phase template to perform a sliding search on the signal to complete signal coarse timing synchronization, where the time-domain phase template is constructed based on the second-stage pre-synchronization code of the M110-39T signal; adopting a cyclic prefix sliding correlation method to perform symbol synchronization on the data segment of the M110-39T signal. The present invention effectively utilizes various time-domain and frequency-domain characteristics to capture the pre-synchronization code, realizes accurate detection and synchronization of M110-39T in a short-wave time-varying channel, provides input parameters for signal demodulation, can adapt to the fading and changeable short-wave channel, and can cope with the scenario of large frequency offset, and has good robustness and practicability.

A method for synchronizing a data frame and data symbols in a communication system includes generating a training sequence including a serial sequence of data symbols that are conjugate symmetric, inserting the training sequence in a transmitter-side data frame, converting constituent data symbols of the transmitter-side data frame to communication signals, transmitting the communication signals from a transmitter to a receiver, converting the communication signals to a stream of received data symbols, detecting presence of the training sequence in the stream of received data symbols, and identifying a position of a received data frame from the presence of the training sequence.

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 relates to the technical field of data transmission, and discloses a method and system for realizing U disk data transmission based on UWB communication, and the method comprises the steps: firstly obtaining equipment characteristic parameters corresponding to a target U disk, recognizing a UWB hardware identification code to determine a communication spectrum range, and dividing a wireless channel environment in combination with a scanning protocol to obtain an accessible frequency band; detecting interference intensity of each frequency band, and analyzing pulse fluctuation characteristics, a transmission error code threshold value and data retransmission times; determining a data attenuation threshold, analyzing a transmission time delay component and calculating a balance compensation index; determining a symbol synchronization path according to the index, and checking the phase deviation tolerance to determine the data transfer state; and finally, based on the state, checking file writing characteristics, and through anti-interference adjustment and time slot optimization, generating a UWB communication data transmission scheme. According to the invention, the USB flash disk data transmission distance, speed and scene adaptability can be improved.

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.

The invention provides a communication method and device, belongs to the technical field of communication, and is used for enabling a synchronization signal to meet higher detection requirements of the synchronization signal in the future. In the method, the phase modulation code is determined through the barker code, and the phase modulation code is used for performing phase modulation on the time domain basic sequence, so that the synchronization signal has better delimiting capability, namely symbol synchronization capability, that is, the terminal node can more accurately determine the starting position of the symbol, the performance of detecting the first synchronization signal by the terminal node can be improved, and the user experience is improved. Therefore, the terminal node can accurately detect the synchronization signal. In addition, the time domain basic sequence comprises multiple segments of same elements, and frequency synchronization can be facilitated. Therefore, the synchronizing signal can meet higher synchronizing requirements in the future.

The invention relates to a device and a transmission system for synchronizing symbol clocks during data transmission between a sender and a receiver, the device having an estimation means (30) and a symbol synchronizer (40). An estimation unit (30) receives a first signal (S1) generated by a sender (10) and estimates a phase deviation (POFF) and / or a frequency deviation (FOFF) between a symbol clock of the sender (10) and a symbol clock of a receiver (20) on the basis of the first signal, generates the first signal (S1) on the basis of the symbol clock of the sender, and analyzes and evaluates the first signal in the receiver on the basis of the symbol clock of the receiver. The device (5) initializes the symbol synchronizer (40) on the basis of the evaluated phase deviation (POFF) and / or the evaluated frequency deviation (FOFF). The symbol synchronizer (40) receives a second signal (S2) generated by the sender (10) in order to generate, on the basis of the second signal (S2), an output signal (SO) representing symbols transmitted inside the second signal (S2) synchronized with the symbol clock of the receiver (20).

The invention provides a ZC sequence-based OFDM (Orthogonal Frequency Division Multiplexing) system synchronization method, which comprises the following steps of: firstly constructing two ZC sequences ZC1 and ZC2 with different roots, then valuing and arranging the ZC1 sequence and the ZC2 sequence to obtain a training sequence, carrying out IFFT (Inverse Fast Fourier Transform) on the training sequence, adding a cyclic prefix to a data frame, then sending the training sequence by a sending end and transmitting the training sequence through a channel, and calculating the cross correlation between the receiving end data and the local training sequence, finally selecting a symbol synchronization position according to a cross correlation calculation value, and after the synchronization position is determined, estimating the carrier frequency offset. According to the scheme of the invention, accurate symbol synchronization and frequency offset estimation can be carried out in a large-fading and low-signal-to-noise-ratio wired channel environment, the synchronization reliability is enhanced, and the operand is reduced.

The embodiment of the invention provides a decoding circuit, a decoding method and a passive internet of things tag, and the circuit comprises a frame synchronization module which is used for transmitting a downlink instruction, an effective frame signal and a symbol feature sequence to a symbol synchronization module; the symbol synchronization module is used for sending the symbol synchronization signal to the symbol decoding module; the convolution result is a convolution output value corresponding to each group of symbol feature sequences; and the symbol decoding module is used for reading convolution output values at two moments at each optimal judgment moment based on the symbol synchronization signal, comparing the convolution output values at the two moments based on a preset comparison rule, generating symbol judgment results, and combining the symbol judgment results to generate effective data. In the mode, effective data can be stably extracted in a complex communication environment, so that the decoding sensitivity and the anti-interference capability of the passive Internet of Things tag in the complex environment are improved, and the decoding precision and the stability of the passive Internet of Things tag are further 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 present invention discloses a symbol synchronization method, device, equipment and medium for caller number recognition. The method includes: determining the capture sampling point of the caller number recognition signal as the initial symbol synchronization point, and obtaining multiple candidate symbol synchronization points corresponding to the initial symbol synchronization point; obtaining a set of sampling points corresponding to each candidate symbol synchronization point, and obtaining the demodulation result of each candidate symbol synchronization point based on a preset number of sampling points; obtaining the prediction variance of each candidate symbol synchronization point according to the demodulation result, and obtaining the target symbol synchronization point corresponding to the minimum prediction variance. The technical solution of this embodiment can improve the accuracy and robustness of the symbol synchronization of caller number recognition by obtaining multiple candidate symbol synchronization points with the capture sampling point of the caller number recognition signal as the starting point, and calculating the prediction variance corresponding to each candidate symbol synchronization point respectively, and then screening the target symbol synchronization point corresponding to the minimum prediction variance among each candidate symbol synchronization point.

The present application discloses a 32APSK parallel demodulation method and system, which first receives a radio frequency signal through an antenna and converts the radio frequency signal into an intermediate frequency signal through a receiving channel through frequency conversion processing, obtains an intermediate frequency digital signal through digital-to-analog conversion, groups the intermediate frequency digital signal in the data packet with two in-phase orthogonal carriers to obtain a mixed signal, and then filters the mixed signal through a low-pass filter to generate an in-phase baseband signal and an orthogonal baseband signal; the in-phase baseband signal and the orthogonal baseband signal are sequentially resampled, frequency offset estimated, carrier synchronized, coherently demodulated and judged to obtain the judged signal, and finally equalized to remove inter-symbol interference. The method has the advantages of low data dependence and high parallelism. After obtaining the I and Q signals, symbol synchronization and carrier synchronization are achieved by open loop, with high parallelism, and is suitable for 32APSK signal demodulation on GPU platforms and at any rate.

The present invention discloses a multi-level overmodulation short packet communication method, comprising: first information is modulated with a first overmodulation sequence to obtain second information; the second information is received as third information through a channel, the third information traverses all correlators to perform correlation operations, and the correlation value with the largest absolute value related to each correlator is taken as fourth information, and the first information to be transmitted is solved according to the correlator corresponding to the correlation value with the largest absolute value; the fourth information is multiplied with the corresponding element of the second overmodulation sequence and then summed, and the absolute value is taken to obtain the evaluation function value; when the evaluation function value is the largest, the corresponding second overmodulation sequence is the second overmodulation sequence used to modulate the first information. The present invention does not need to increase the demodulation complexity of the user, improves the information frame symbol synchronization performance, and adds additional information for without increasing the length of the data packet.

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 invention discloses an MSK fast frame capture and symbol synchronization method based on a super symbol, and belongs to the technical field of wireless communication. The method comprises the following steps: firstly, by taking a super symbol as a basic processing unit, completing multi-template complex matching of the super symbol by using Fourier transform on the basis of high-power oversampling processing to form a super symbol matching matrix; and then, on the basis of the super-symbol matching matrix, extracting a corresponding super-symbol sequence from the frame header sequence according to the content of the frame header sequence, completing quasi-coherent combination of the super-symbol sequence by using Fourier transform, extracting the most possible path from multiple paths of quasi-coherent combination results to perform peak judgment, and completing frame capture and symbol synchronization after successful judgment. According to the method, the problem that the symbol boundary is difficult to directly judge through phase jump in the complete MSK modulation waveform is solved, and the requirements of MSK burst communication on frame capture and symbol synchronization are met.

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.