210 results about "Constellation diagram" patented technology

A small sample modulation identification method based on combination of multi-domain contrast learning and reinforcement learning comprises the following steps: 1) obtaining a data set, dividing the data set into a base set, a support set and a verification set, converting the data set into a time domain, a frequency domain and a constellation diagram form, and obtaining a corresponding encoder and a common projection head; 2) inputting the base set data into an encoder for feature extraction, inputting the obtained features and accuracy as a state and an award into a decision body for reinforcement learning training to obtain a data enhancement action, inputting the original data and the enhancement data into the encoder and a projection head, and performing comparative learning training in a high-dimensional space to obtain a data enhancement action; the reinforcement learning training is repeated until the rewards are not increased any more; 3) loading and freezing encoder parameters, and training an attention module and a linear classifier by using a support set; and 4) loading and freezing all module parameters, and verifying the performance by using the verification set. According to the method, the signal model can have good performance in a small sample scene.

The invention discloses an electromagnetic target recognition method based on interpretable multi-task learning, a storage medium and equipment, and the method comprises the steps: firstly constructing a multi-task learning network facing modulation recognition and individual recognition, inputting an original signal, setting a hyper-parameter, and carrying out the training of the multi-task learning network; constructing a generator for outputting a disturbance signal, segmenting an original signal and generating an original mask, generating a disturbance mask through an inversion element, and further generating the disturbance signal; inputting the disturbance signals into the trained multi-task learning network to obtain probability distribution of classification results under different tasks; taking a prediction probability of a multi-task model to a disturbance signal as a supervision label, training a local linear model on an original mask and a disturbance mask, and taking a model weight Wg as a contribution degree of each subsequence to explanation through optimization; and performing normalization processing on the Wg, mapping the weight back to the original signal length, and visually marking a time-frequency domain signal region which plays a key role in model decision based on a constellation diagram.

The invention provides a coding modulation method and a related device, and the method comprises the steps: carrying out the coding of N input bit sequences through employing code rates corresponding to the N input bit sequences, and obtaining N coded bit sequences corresponding to the N input bit sequences; the length of each input bit sequence is determined according to at least one of a code rate, a modulation order or the number of resource elements (RE) used for data transmission corresponding to the input bit sequence; the N coded bit sequences are mapped to the same constellation diagram, the constellation diagram comprises M constellation points, each constellation point comprises N segmented bits, and the N segmented bits correspond to the N coded bit sequences respectively. According to the process, the transmission efficiency is guaranteed, the coding complexity of the sending end is reduced, in addition, the protocol modification degree is also reduced, and the coding implementation cost is further reduced.

The invention discloses a three-dimensional 16QAM constellation diagram based on geometric shaping and a digital communication method, and relates to the field of communication, in a three-dimensional space, 16 constellation points are distributed on the surface of a three-dimensional sphere with the radius of 2.5, and 8 constellation points are distributed on each of the upper hemispherical surface and the lower hemispherical surface; a regular pentagon parallel to the XOY plane is formed by five constellation points in the upper hemispherical surface, the center of the regular pentagon coincides with the projection of the sphere center on the XOY plane, and one edge of the regular pentagon is parallel to the XOZ plane; the other three constellation points form an equilateral triangle parallel to the XOY plane, the center of the equilateral triangle coincides with the projection of the sphere center on the XOY plane, and the vertical bisector of one edge of the equilateral triangle is parallel to the YOZ plane; and rotating the eight constellation points of the upper semi-spherical surface by 180 degrees along the center of the sphere in the direction parallel to the YOZ plane to obtain the distribution of the constellation points of the lower semi-spherical surface. According to the method, the channel noise tolerance and the overall transmission performance of the system are improved, the bit error rate is reduced, and the method has an important application prospect in a high-tolerance and high-performance transmission system.

The invention provides a communication radiation source individual identification method based on time domain and time sequence coding constellation diagram feature fusion. The method is used for realizing stable identification of different transmitters under non-ideal conditions of carrier frequency offset, noise interference and the like. The method comprises the following steps: firstly, carrying out normalization and fixed-length interception on a received I / Q signal, and calculating an oversampling multiple according to a symbol rate and a time resolution; then, a time domain and time sequence coding constellation diagram double-branch feature extraction network is constructed, a time domain structure feature is extracted from a time domain branch by adopting a one-dimensional modified ResNet18, and a constellation diagram with time information is generated from a time sequence coding constellation diagram branch through a time sequence coding constellation module and the feature that the phase changes along with time is extracted; and carrying out joint modeling on the two types of features through a trainable weighted fusion mechanism. In the training stage, the performance of the model is improved by adopting cross entropy loss, an Adam optimizer, learning rate scheduling and an early stop strategy. In the reasoning process, input signals are classified by using the model weight with the highest verification accuracy, and a communication radiation source individual identification result is output. Experimental results show that the method can effectively enhance the frequency offset robustness and generalization ability of the model, realizes high-precision identification of the individual communication radiation source, and is suitable for the fields of security access of the Internet of Things, spectrum monitoring, electronic countermeasures and the like.

The invention discloses a hollow-core optical fiber communication method and system for reducing complexity, and the method comprises the steps: obtaining original bit data, and mapping the original bit data to an initial constellation diagram through a quadrature amplitude modulation mapping algorithm; rotating the initial constellation diagram according to a preset rotation angle to obtain a first constellation optimization diagram, adjusting the first constellation optimization diagram by using a sparrow search algorithm to obtain a second constellation optimization diagram, converting the second constellation optimization diagram into a transmission signal, and transmitting the transmission signal to the receiving end through a hollow-core optical fiber; performing data preprocessing on the received transmission signal to obtain a de-noised signal, performing phase recovery on the de-noised signal based on a quadratic algorithm to obtain a second constellation optimization graph, and performing de-mapping on the second constellation optimization graph to re-convert the second constellation optimization graph into original bit data; according to the invention, the complexity of digital signal processing is reduced, and the accuracy and efficiency of phase recovery are obviously improved, so that the performance of a coherent optical communication system based on the hollow-core optical fiber is comprehensively improved.

The invention relates to a task-oriented semantic communication-oriented adaptive source channel coding system, which belongs to the field of wireless communication, and comprises a sending end for extracting a semantic feature map for evaluation from input data through a feature extractor initialized based on a pre-training large model, executing nested quantization and arithmetic coding based on a calculated importance score, and sending the semantic feature map to a task-oriented semantic communication-oriented adaptive source channel coding system; generating a scalable semantic bit stream with importance levels; the physical layer is used for carrying out reordering and grouping according to importance levels of bit streams, a channel encoder is combined with an interleaver to realize unequal error protection of semantic matching, and encoded bits are mapped to sign bits with different fault-tolerant capabilities in a constellation diagram through division modulation; and a receiving end: recovering the semantic feature map through arithmetic decoding and nested inverse quantization. According to the invention, on the premise of keeping compatibility with a digital communication protocol stack, through distortion-driven joint rate self-adaption, the transmission effectiveness for machine tasks and human vision is obviously improved under a limited bandwidth.

The present invention discloses a signal modulation recognition method based on feature fusion, comprising: obtaining a data set of modulated signal samples; preprocessing the modulated signal samples, including extracting a spectrum and constellation diagram of the modulated signal samples; normalizing the spectrum and constellation diagram, and concatenating the normalized spectrum and constellation diagrams to obtain a corresponding fused feature diagram, and dividing the fused feature diagram into a training set and a test set; establishing a deep neural network model, the deep neural network model including a CNN network, an LSTM network, an attention mechanism module, and a classifier connected in sequence; inputting the fused feature diagram in the training set into the deep neural network model for training to obtain a trained deep neural network model; inputting the fused feature diagram of the actual received signal into the trained deep neural network model for recognition to obtain a modulation recognition result. This method enhances feature diversity and has high recognition accuracy and generalization capability.

The invention discloses an orthogonal frequency division multiplexing transmission method and system based on probability shaping. The method comprises the following steps: grouping constellation points according to transmitting power to obtain a symbol mode; constructing a mapping relation between index bits and modulation strategies according to a set mapping probability to obtain the mode distribution table; the method comprises the following steps: dividing an input original bit into an index bit sequence and a data bit sequence, querying a preset mode allocation table according to the index bit sequence to obtain a modulation strategy, and performing constellation mapping on the data bit according to the modulation strategy to generate a constellation point; mapping the constellation points to a subcarrier to generate an orthogonal frequency division multiplexing symbol block; converting the orthogonal frequency division multiplexing symbol block into a transmission signal; in response to the received transmission signal, the transmission signal is recovered to obtain the original bit, probability shaping is performed on the constellation points in the constellation diagram, so that a high-power symbol is allocated with fewer subcarriers, and the bit error rate in the communication transmission process is improved.

The present invention proposes a method for data enhancement and individual identification of small-sample radiation sources based on equipotential constellation diagrams, comprising the following steps: preprocessing the collected I / Q signals emitted by the radiation source, and mapping the one-dimensional I / Q signal sequence data onto a two-dimensional equipotential constellation diagram image. An improved generative adversarial network is used to perform data enhancement on the two-dimensional equipotential constellation diagram of the I / Q signal sample, and a structural similarity measurement method is used to screen the generated equipotential constellation diagram to optimize the quality of the generated samples. A residual neural network recognition model is constructed, and the generated sample data set is merged with the original data set for model training. Finally, the obtained radiation source recognition model identifies the radiation source device in the small-sample scenario. By comprehensively applying technologies such as mapping the I / Q signal sequence data to images, data enhancement and screening, the model provides an effective solution for individual identification of radiation sources in small-sample scenarios.

The invention discloses a wireless communication transmitter and method based on a transmission-type space-time joint coding metasurface, and belongs to the technical field of high-frequency-band wireless communication. The transmitter comprises a 10 * 10 transmission type intelligent metasurface array, a four-way space-time joint encoder and a control system, 0-degree, 90-degree, 180-degree and 270-degree four-phase compensation of + 1-order harmonic waves is generated by applying four-way control signals with different time delays (0, 0.25 T, 0.5 T and 0.75 T), baseband signal modulation is completed by combining QPSK mapping, and dynamic beam forming is achieved through spatial domain phase gradient compensation. The time delay configuration of the difference 90-degree phase of the four paths of signals enables each column unit of the metasurface to synchronously complete information modulation and beam pointing control under time domain and space domain joint coding. According to the invention,-30-30-degree beam scanning is realized in the 6.6 GHz frequency band, the main lobe gain reaches 17.8 dBi, the orientation error is less than 2 degrees, and the constellation diagram EVM is superior to 8%. The method has the advantages of low loss, high orientation precision and confidentiality, and is suitable for a 6G communication system and a dynamic reconfigurable network.

The invention provides a communication method and a communication device, which are applied to the technical field of communication. In the technical scheme provided by the invention, the bit sequence is modulated by using the constellation diagram which is linearly combined with the plurality of constellation diagrams to meet the preset relational expression, so that the complex value modulation symbol is obtained. According to the technical scheme of the invention, the transmission requirements of information with different transmission performances can be met.

The invention provides a signal-to-noise ratio estimation method and device suitable for PSK (Phase Shift Keying) modulation. The method comprises the following steps: calculating the average power of an input signal sequence; estimating the average power of the pilot frequency sequence; and calculating a signal-to-noise ratio. According to the method, the influence degree of noise on the distance between the PSK modulation signal and the original point in the constellation diagram is estimated, a traditional method for calculating the signal-to-noise ratio by estimating the deviation degree of the actual signal from the ideal signal due to the influence of noise is replaced, high accuracy can still be kept when the signal is influenced by Doppler frequency deviation and sampling deviation, the method is more suitable for an actual communication system, and compared with the prior art, the method has the advantages of simple operation and low cost. In an actual communication system, signal-to-noise ratio estimation is usually carried out after signal timing synchronization and carrier synchronization processing, however, the signal-to-noise ratio calculation method provided by the invention can be used for estimating the signal-to-noise ratio after synchronization before synchronization according to PSK modulation characteristics, and has certain application advantages in scenes such as switching modulation waveforms according to the signal-to-noise ratio.

The present application provides a communication method and a communication apparatus, applicable to a simultaneous wireless information and power transfer scenario. A constellation diagram for an energy transmission frequency domain resource unit is designed, so that modulation symbols on the energy transmission frequency domain resource unit and a data frequency domain resource unit correspond to different constellation diagrams, that is, the data frequency domain resource unit and the energy transmission frequency domain resource unit are modulated by means of different modulation modes, enabling a receiving end device to correctly identify the position of the energy transmission frequency domain resource unit, thereby demodulating correct data.

The invention discloses an SOQPSK demodulation performance monitoring method and system based on upper computer visual feedback. An SOQPSK signal is demodulated by adopting a maximum likelihood sequence detection method based on a Viterbi algorithm; removing the influence of a phase pulse function through matched filtering processing, extracting I / Q data of a fixed sampling point in each symbol period, carrying out time domain superposition, and generating eye pattern data in real time; based on the mapping relation between the grid state variable of the SOQPSK demodulator and the CPM phase state, the maximum survival state in the Viterbi algorithm is used as a phase value, and constellation diagram data is generated in real time in combination with the survival path measurement increment; and packaging the eye diagram data and the constellation diagram data to an upper computer for display, performing performance parameter evaluation and feeding back to a demodulator. The FPGA generates eye diagram and constellation diagram data in real time and sends the eye diagram and constellation diagram data to the upper computer for display and performance evaluation, and visual performance monitoring is provided. And parameters of the demodulator are adjusted in real time, so that a closed loop is integrally formed.

The embodiment of the invention provides a signal transmission method and a communication device, and the method comprises the steps: receiving a data signal and a DMRS, and obtaining a symbol borne by the data signal according to the data signal and the DMRS; according to the method, the power offset proportionality coefficient between the data signal and the DMRS is determined according to the power offset proportionality coefficient, and then the constellation point corresponding to the symbol can be determined according to the power offset proportionality coefficient during demodulation, so that the offset between the coordinate point corresponding to the symbol on the constellation diagram and the constellation point actually corresponding to the symbol in the constellation diagram can be reduced through the power offset proportionality coefficient; therefore, the probability that the symbol is misjudged as other constellation points is reduced, namely the bit error rate in the data signal transmission process is reduced.

The invention provides a communication method and related equipment, relates to the field of communication, and is used for improving the sensing performance in a communication system in a communication and sensing integrated scene. In the method, first equipment sends first information, the first information is used for scheduling a first resource, the first resource comprises N orthogonal frequency division multiplexing (OFDM) symbols on a first time slot, N is a positive integer, and time domain intervals between adjacent OFDM symbols in the N OFDM symbols are first intervals; the first device transmits a sensing signal, the sensing signal is carried in the N OFDM symbols, the sensing signal is modulated according to a first modulation mode, and the amplitudes of different constellation points in a constellation diagram corresponding to the first modulation mode are equal, or the amplitudes of the different constellation points in the constellation diagram corresponding to the first modulation mode are equal; the difference value of the amplitudes of different constellation points in the constellation diagram corresponding to the first modulation mode is smaller than or equal to a first threshold value.

The invention discloses an underwater CSK-OFDM modulation and detection method based on LED linear constraint, and the method comprises the steps: enabling a transmitter to map a data bit stream of a constellation diagram into a complex symbol stream, converting the complex symbol stream into a real number time domain sequence through an ACO-OFDM module, carrying out the LED amplitude limiting of the time domain sequence, and obtaining a time domain clipping sequence; transmitting the time domain clipping sequence in a UOWC channel through a corresponding LED, introducing symbol timing deviation and amplitude limiting noise into a frequency domain by a receiver, and processing the time domain clipping sequence by using an ACO-OFDM module again to obtain a received signal; under the maximum expectation framework, the probability from each alternative constellation diagram is calculated, symbol timing deviation and additive white Gaussian noise variance are estimated, a globally optimal solution is obtained, and a constellation diagram recognition result is output through maximum likelihood demodulation. According to the method, the linear range constraint of the LED and the complex environment under the UOWC scene are comprehensively considered.

The embodiment of the invention provides a digital signal equalization processing method and device, electronic equipment and a readable medium, and the method comprises the steps: judging whether a historical equalization digital signal output when a preset filter carries out the equalization processing of a historical digital signal exists in preset equipment or not; if yes, determining position information of the historical balanced digital signal in a preset constellation diagram according to a preset constellation point position determination strategy; according to the position information of the historical equalization digital signal, determining an error determination strategy for the historical equalization digital signal, and according to the error determination strategy, determining an equalization processing error of the filter on the historical digital signal; adjusting a filter according to the equalization processing error to obtain a target filter; the target filter is used for carrying out equalization processing on the current digital signal to obtain the current equalized digital signal, and the problem of phase ambiguity existing in the current digital signal cannot be aggravated.

The embodiment of the invention provides a communication method and device, a storage medium and a program product, relates to the technical field of communication, and is used for reducing interference between users. The method comprises the following steps: a first node receives capability information sent by a second node, wherein the capability information is used for representing capability supported by the second node; based on the capability information, the first node sends first indication information to the second node, the first indication information is used for indicating a codebook to be used by the second node, the codebook is obtained based on a plurality of user constellation diagrams, and the plurality of user constellation diagrams are obtained by decomposing a superposed constellation diagram.

The invention discloses a low-complexity unequal error protection method based on two-stage cascading, and relates to the technical field of communication. Comprising the following steps: constructing a multi-stage coded modulation system with a two-stage cascade structure; respectively coding the information bits with different importance degrees based on a two-stage cascade structure of the multi-stage coding modulation system to form differentiated coding data streams; designing an optimal constellation diagram through constellation geometric shaping according to the transmission requirements of the differentiated coded data streams after coding; performing constellation mapping on the obtained differentiated coded data stream according to the optimal constellation diagram, and performing signal transmission on the mapped constellation symbols; and after the transmitted constellation symbols are received, decoding processing is performed on the constellation symbols by adopting a multi-stage decoding strategy. According to the method, the decoding complexity is greatly reduced on the premise that the error code performance is not lost.

The invention relates to the technical field of communication security, and particularly provides an encryption method based on a dynamic coupling image lattice, comprising the following steps: S1, acquiring to-be-encrypted constellation diagram data, and taking the constellation diagram data as plaintext data; s2, carrying out DNA coding on the plaintext data, then carrying out arithmetic operation, and then carrying out DNA anti-coding to complete data disturbance encryption; rules of DNA coding, operation and DNA anti-coding are determined through a preset method. The preset method comprises the following steps: S21, acquiring a key sequence, and dividing the key sequence; s22, generating a first intermediate one-dimensional pseudo-random sequence by using a first chaotic mapping model; s23, performing dynamic iteration on the first intermediate one-dimensional pseudo-random sequence by using a one-dimensional coupling mapping lattice model fused by a second chaotic mapping model to obtain a second intermediate one-dimensional pseudo-random sequence; and S24, determining the rules of DNA coding, operation and DNA anti-coding through the second intermediate one-dimensional pseudorandom sequence. The method is high in sequence randomness and high in communication security.

The present invention discloses a method and system for QPSK and 8PSK identification and demodulation. The method identifies the modulation type of an input signal, performs M-th power calculation on the input signal according to the modulation type, and calculates the index corresponding to the maximum value of the amplitude spectrum power; calculates the coarse frequency deviation point corresponding to the index and the corresponding compensation signal, calculates the frequency point value corresponding to the maximum value of the phase difference value of the compensation signal, and uses the frequency point value to perform frequency compensation on the input signal to obtain a frequency-free signal; calculates the position of each point of the frequency-free signal on the phase-free standard constellation diagram corresponding to each point on the constellation diagram to obtain a phase-free standard signal; corrects the phase deviation between the phase-free standard signal and the frequency-free signal, takes the average of the corrected phase deviation to obtain the phase deviation to be compensated, and performs phase deviation compensation on the frequency-free signal to obtain a phase-free signal. The modulation type identification of the input signal is automatically completed during the frequency deviation estimation process, and the frequency deviation estimation and phase deviation estimation process have fewer steps and a simpler process.

The invention discloses an interference detection method and a related device, and is applied to the technical field of communication, and the method comprises the steps: obtaining a plurality of to-be-demodulated data signal segments in a time slot; determining a modulation mode corresponding to the data signal segment; for each to-be-demodulated data signal segment, determining an error vector amplitude corresponding to the data signal segment based on an ideal constellation diagram corresponding to the modulation mode; determining a reference error vector amplitude based on the error vector amplitude of each data signal segment; and if the data signal segment satisfies a set condition, determining that interference data exist in the data signal segment, the data signal segment satisfying the set condition comprises that a difference value between an error vector amplitude of the data signal segment and a reference error vector amplitude is greater than a set threshold. According to the scheme, the situation that data signals with interference data cannot be detected can be reduced, and the accuracy of interference detection is improved.

This application discloses an encoding and modulation method, a decoding method, and related equipment, which provides an encoding and modulation method that can adjust the spectral efficiency of the encoding system and achieve better encoding performance. The method of this application includes: the encoding device dividing target bit information into a first bit set and a second bit set; the encoding device generating amplitude bits from the first bit set and phase bits from the second bit set using a distribution matching algorithm; and the encoding device transforming the amplitude bits and phase bits into corresponding four-dimensional symbol information according to a D4Lattice isomorphic constellation diagram.

The invention discloses a radio frequency signal demodulation method and device. The method comprises the following steps: receiving an OFDM (Orthogonal Frequency Division Multiplexing)-based radio frequency signal comprising a plurality of subcarriers, each subcarrier time slot comprising a column of pilot signals; performing conversion processing on the radio frequency signal to obtain a frequency domain signal corresponding to each subcarrier, the frequency domain signal comprising a plurality of OFDM symbols; for each frequency domain signal, primary frequency offset compensation is carried out on each OFDM symbol in the frequency domain signal based on the pilot signal, and for a far-end OFDM symbol whose distance from the position of the pilot signal exceeds a preset distance, secondary frequency offset compensation is carried out on the far-end OFDM symbol based on the distribution state of each constellation point mapped to the constellation diagram; and recovering each frequency domain signal subjected to frequency offset compensation into original bit data. According to the method and the device, the technical problem that the error vector amplitude of a remote symbol demodulation result is relatively large when only a single-column pilot signal is configured in a subcarrier time slot in a traditional demodulation scheme is solved.

A communication method and a communication apparatus are provided. The method includes: a relay node receiving a first signal, the first signal including a first modulation symbol from a first source node and a second modulation symbol from a second source node, wherein the first modulation symbol includes a symbol mapped on a first constellation diagram, the first constellation diagram having multiple constellation points in the same quadrant, and the minimum distance between two adjacent constellation points in the same quadrant being less than 2k, where k is a constellation mapping normalization factor; the second modulation symbol includes a symbol mapped on a second constellation diagram, the second constellation diagram having no more than one constellation point in each quadrant, and the transmission power of the second modulation symbol being determined based on the transmission power of the first modulation symbol; the relay node then forwards the first signal. By reducing the distance between adjacent constellation points in the same quadrant and re-determining the transmission power, the bit error rate of the first signal received by the relay node is improved, thereby greatly reducing the risk of the relay node eavesdropping on information.

The invention discloses a low-complexity signal-to-noise ratio estimation method and device, and relates to the technical field of coherent optical communication, and the method comprises the steps: employing a modulation mode to map a signal to a constellation diagram in a communication link, and extracting a to-be-estimated real number signal from a received signal according to a preset signal-to-noise ratio estimation mode; judging the real number signal to be estimated according to an estimation mode to obtain a positive signal and a negative signal; carrying out addition and subtraction operation on the positive and negative signals respectively and carrying out modulus averaging to obtain a noise modulus value of linear representation; and inputting the noise module value into a preset lookup table, and combining a log value of a known signal module value to obtain a signal-to-noise ratio estimation value based on logarithm representation. According to the method, multiplication is completely removed, the complexity is greatly reduced, iteration is not involved in the table look-up process, so that the complexity is very low, the estimation precision can be freely set according to the size of the table, and the flexibility is high.

A communication method and apparatus, a computer program product, and a readable storage medium, the communication method comprising: acquiring a training sequence sent by N terminal devices, N being a positive integer and N > = 2; determining a reference collision pattern; the reference collision pattern is a constellation diagram corresponding to a collision result on a complex plane, and the collision result is formed by collision of training sequences sent by the N terminal devices. By adopting the scheme, the data in collision can be analyzed, so that the system capacity is improved.

The application discloses a detection synchronization and demodulation design method based on a high-speed burst communication system, comprising the following steps: S1, performing fast acquisition on a burst synchronization sequence in a high-speed QPSK and OQPSK satellite communication system; S2, after the matching flag of the synchronization sequence in S1 is valid, performing M&M frequency offset estimation on current on-the-fly complex signal data and a preset synchronization sequence, generating a corresponding carrier compensation value by using the calculated frequency difference value, and outputting the frequency-compensated on-the-fly complex signal; S3, performing phase estimation on the frequency-compensated on-the-fly signal and the preset synchronization sequence, generating a corresponding phase compensation value by using the calculated phase difference value, and outputting the frequency-phase-compensated on-the-fly signal; and S4, after the frequency-phase compensation is completed, the on-the-fly complex signal is sent into a small-bandwidth synchronization tracking loop to generate a compensation value, a constellation diagram is output, and a symbol hard decision is performed on the loop output to output a synchronization code stream. The application meets the requirements of low bit error rate and missed detection and false detection rate, and provides good demodulation performance.