26 results about "Fountain code" patented technology

The invention discloses a method, a system, equipment and a medium for improving reliability of high-frequency data acquisition in a multi-element load scene, and relates to the technical field of power system communication and data acquisition, comprising the following steps: broadcasting beacons to a station area and receiving terminal response, constructing dynamic network topology and channel state information, executing dynamic channel allocation based on the received information, and sending the dynamic network topology and channel state information to the station area. The method comprises the following steps: acquiring minute-level data packets, performing fragment coding on the acquired minute-level data packets, selecting an optimal path for each terminal for transmission in combination with a network state, collecting fragments at a receiving side, checking integrity, decoding and restoring when conditions are met, and otherwise, starting a local retransmission mechanism until the data packets are successfully recovered. According to the method, the reliability guarantee system is constructed by dynamically sensing the network state, cooperatively optimizing channel allocation and transmission paths and combining fountain code coding and a precise retransmission mechanism, and the success rate and the integrity of high-frequency data acquisition are remarkably improved in a multi-element load scene.

The invention provides an underwater acoustic network online fountain code method, a sender device and a receiver device, and the method adopts a dynamic rule coding strategy of rule coding and random coding to generate a rule degree 2 coding packet, a random degree 2 coding packet and a random degree 1 coding packet, and random coding dynamically adjusts coding redundancy based on channel conditions, and two coding modes are dynamically fused, so that the decoding overhead can be effectively reduced, the feedback frequency is reduced, and the overall time delay is reduced. In the decoding stage, the feedback information in the feedback packet is fully utilized to remarkably improve the decoding efficiency, the optimal coding set information contained in the feedback packet can reflect the decoding state of a receiver more efficiently, the useful probability of the coding packet in the decoding process is improved, and the overall decoding overhead is reduced. According to the invention, the sender can estimate the channel state in real time and adaptively determine the redundant data sending amount, thereby realizing effective control of the decoding overhead, improving the decoding efficiency and reducing the number of feedback times.

The application provides a fountain code-based adaptive video transmission method, an electronic device and a storage medium, and the method comprises the following steps: receiving historical packet loss rates of all data packets corresponding to video image sent frames which are counted and fed back by a receiving end of a video transmission system; updating coding redundancy for fountain code encoding of a current frame of a video image based on the historical packet loss rates of the video image sent frames; compressively encoding the current frame of the video image to be transmitted to generate a compressed code stream data frame; fountain code encoding the compressed code stream data frame according to the coding redundancy to generate coding data packets corresponding to the current frame of the video image; and transmitting the coding data packets corresponding to the current frame of the video image to the receiving end of the video transmission system. The application can realize real-time video transmission with low computational complexity, low performance consumption and high decoding success rate.

The invention discloses a high-reliability low-flow data backhaul protocol method, and relates to the technical field of communication protocol and transmission strategy optimization. Comprising the following steps: S1, data coding and segmentation; s2, packaging and sending a micro package; s3, receiving and confirming data; s4, a retransmission mechanism; and S5, performing differential compression and uploading. According to the method, the redundancy rate is dynamically calculated, and the characteristics of fountain codes are combined, so that accurate packet loss compensation is realized, and the retransmission probability is remarkably reduced; based on a timeout retransmission mechanism, the anti-interference capability is further enhanced, and the data integrity in an extreme environment is ensured; through time-frequency and two-dimensional random sending strategies, co-frequency collision and channel congestion are effectively avoided, and the transmission success rate in a low signal-to-noise ratio scene is improved.

The application discloses a multi-mode multi-rate satellite signal transmitting device suitable for a rotorcraft, and relates to the technical field of satellite communication. The device comprises a monitoring generation module, a multi-mode control module, a service access module, a fountain coding module, an interface management module, a coding interleaving module, a data group framing module, a data retransmission module, a data modulation module and an intermediate frequency processing and control module. The multi-mode control module receives modulation coding information and transmission mode information transmitted by the monitoring generation module, and sends the transmission mode information to the fountain coding module, the coding interleaving module and the data retransmission module respectively, sends modulation mode information to the data modulation module, and sends coding mode to the coding interleaving module. The application can overcome the influence of rotorcraft rotor shielding on satellite signal transmission, adopts a multi-mode switching technology, and can select a suitable anti-rotor shielding mode according to different rotorcraft rotor speeds and different satellite conditions.

This invention discloses a secure transmission method for satellite constellation communication based on post-quantum cryptography, relating to the fields of satellite communication and information security technology. The method includes: analyzing the satellite constellation topology to determine the latency sensitivity level of the secure handshake; pre-screening a set of candidate PQC algorithms based on the sensitivity level; sensing the channel and extracting non-stationary features such as fading depth, duration, and Doppler rate of change; constructing a multi-dimensional joint optimization model with algorithm identifier, fragmentation granularity, redundancy, and modulation and coding scheme as joint decision variables, aiming to maximize the handshake probability within the expected duration; solving the model to generate an adaptive transmission strategy, and performing adaptive non-uniform fragmentation and fountain code encoding on PQC protocol data units; predicting link trends based on Doppler rate of change and dynamically scheduling symbol transmission. This invention achieves deep coupling optimization of network topology, cryptographic algorithms, and channel characteristics, improving the transmission reliability of PQC in dynamic satellite networks.

The invention provides a 5G NTN waveform anti-rotor-shielding method suitable for helicopter communication, and the method comprises the steps: setting a switching threshold value of an adaptive modulation code and a fountain code, and carrying out the switching according to the channel quality; when the channel quality is good, adaptive modulation and coding are adopted, channel feedback CQI is obtained, and according to the adaptive modulation and coding technology, a proper modulation mode and coding efficiency are selected, and uplink and downlink waveforms of a 5G NTN system conforming to a target modulation mode and a target code rate are constructed; and when the channel quality is poor, using a fountain code, taking the LDPC code under the 5G NTN specification as an outer code, and taking the LT code as an inner code, and constructing uplink and downlink waveforms of the 5G NTN system conforming to the target modulation mode and the target code rate. According to the method, the adaptive modulation coding technology and the Raptor fountain code are utilized, so that the communication quality is ensured under the condition that the helicopter rotor is shielded, and the rotor shielding resistance of helicopter communication is improved.

Methods, systems, and devices for encoding data for storage in genetic material are disclosed. For example, a computing system can segment user data into a plurality of data blocks and generate seed data characterizing a plurality of fountain code seeds. Additionally, the computing system can, for each data block, implement a set of operations to generate one or more data packets. In some instances, the set of operations can include, for each of the plurality of fountain code seeds, determining a bit value and a corresponding meta code value, and determining which of the fountain code seeds has a meta code value for the bit value that matches a value for the bit position identified in the metadata. Furthermore, the computing system can, for each data packet, cause implementation of a second set of operations to synthesize a polynucleotide strand from at least the bit values of the corresponding data packet.

The invention provides a joint degree distribution design and optimization method for fountain codes. The method comprises the steps of obtaining to-be-transmitted test data in a current scene; using to-be-transmitted test data to form an optimized joint degree distribution model by taking the minimum average decoding overhead as an optimization target under the joint degree distribution model; the joint degree distribution model is obtained by joint construction of probability distribution of modified Poisson distribution, probability distribution of ideal soliton distribution and probability distribution of sliding robust soliton distribution; based on the optimized joint degree distribution model, performing global optimal solution search processing on a to-be-optimized weight coefficient in the optimized joint degree distribution model by adopting a Monte Carlo simulation method and a double-layer nested search method to obtain a global optimal weight; and substituting the global optimal weight into the joint degree distribution model to obtain final fountain code joint degree distribution in the current scene. Therefore, the rationality of the degree distribution structure, the consistency of the optimization target and the system performance and the improvement of the global optimality of the design method are realized.

This invention relates to the field of channel communication technology, specifically disclosing a method for improving the communication performance of plasma sheath channels based on fountain code soft decoding. After establishing a plasma channel model, the amplitude attenuation function follows a log-normal distribution, and the phase shift function follows a Gaussian distribution. The probability densities of the amplitude attenuation function and the phase shift function are calculated respectively. Then, combined with the plasma channel model, the conditional probability density of the plasma sheath channel for matched filtering of the received signal is calculated. The log-likelihood ratio in the plasma sheath channel under BPSK modulation of ideal channel information is calculated, as well as the likelihood probability value and log-likelihood ratio of the received signal under unknown plasma sheath channel parameters. This determines the initial values ​​for iteration, which are then used for fountain code soft-decision decoding. This invention enables the reuse of usable information in discarded fountain code packets, thereby further improving the utilization rate of fountain code packets and enhancing the overall communication efficiency of the plasma sheath channel.

The invention provides a low-bandwidth satellite image transmission system for token semantic importance matching. The low-bandwidth satellite image transmission system comprises a sending end, an erasure channel and a receiving end, the sending end is a satellite load end and comprises a token module and an unequal difference protection coding module based on an expansion window fountain code, the token module is used for converting a satellite image into a source token sequence containing semantic hierarchies, and the unequal difference protection coding module is used for generating an anti-erasure coding token according to a discrete token sequence; the coding token is transmitted by an erasure channel; the receiving end comprises a decoding module, a multi-mode token recovery module and an image reconstruction module, the decoding module is used for decoding the coded token, the multi-mode token recovery module is used for repairing the lost token, and the image reconstruction module is used for reconstructing the satellite image according to the repaired token. According to the method, the core semantic fidelity, the anti-interference capability and the spectrum efficiency can be effectively improved.

The application discloses an anchor point synchronous fountain code anti-cropping text watermarking method for a screen camera scene, and specifically comprises character instance extraction and carrier construction, watermark load construction and blocking, data block generation and in-block error correction, anchor point period mapping and character instance level embedding, screen camera and cropping attack, watermark extraction and anchor point synchronous block cutting, data block screening and two-section fountain recovery, and global verification output. The application can realize reliable recovery of watermark information under screen camera degradation and local cropping superposition conditions.

The application relates to a data transmission method based on a quantum key seed, a communication system and a storage medium, the method comprising: cutting an original data stream into data frames, performing fountain code encoding on each data frame to generate a coded symbol stream, generating a truly random quantum key seed, generating a time hopping control sequence through an encryption secure pseudo-random number generator with the quantum key seed as input, sending the coded symbol stream to a receiving end according to the time hopping control sequence, and recovering the original data stream from the data frames of the coded symbol stream by the receiving end according to the fountain code encoding, the quantum key seed and the coded symbol stream. According to the technical scheme, the'scissors difference' defect of the quantum key rate and the data rate is avoided, the real-time communication demand is met, and the time hopping pattern is generated by the quantum key seed, so that the security is established on two dimensions of quantum randomness and time uncertainty, and the security of data communication is improved.

The invention relates to the technical field of unmanned aerial vehicle cluster communication, and discloses an ultra-wide-angle laser and radio frequency adaptive converged communication method and system for a low-altitude unmanned aerial vehicle cluster. According to the method, effective throughput is calculated by obtaining real-time link parameters of an ultra-wide-angle laser link and a radio frequency link, data packet self-adaptive allocation weights are calculated based on the effective throughput proportion, data packets are allocated to a laser queue and a radio frequency queue according to the weights, fountain codes with differential redundancy rates are applied to the two queues for coding, and the two queues are coded according to the fountain codes with the differential redundancy rates. And performing joint decoding at a receiving end to recover the original data stream, and feeding back and adjusting the distribution weight and the redundancy rate parameter according to the decoding success rate. According to the invention, the technical problem that the overall throughput and reliability cannot be optimal during parallel transmission of heterogeneous links is solved.

The invention provides an ultraviolet communication channel coding method and system, and is applied to the technical field of ultraviolet communication, and the method comprises the steps: carrying out the fountain code coding of to-be-transmitted data, and obtaining a plurality of coding packets; performing spread spectrum processing on the coding packet based on the spread spectrum code to obtain a plurality of pieces of spread spectrum information; modulating the spread spectrum information to obtain modulation information; modulation information is transmitted to an atmospheric channel based on the ultraviolet photons. According to the ultraviolet communication channel coding method provided by the invention, the to-be-transmitted information is subjected to coding, spectrum spreading and modulation processing, so that the data transmission capability between the transmitting end and the receiving end is improved, the probability of data packet loss and error code occurrence in the ultraviolet communication transmission process is remarkably reduced, and the ultraviolet communication efficiency is improved.

The invention relates to a configuration file downloading method and system, computer equipment and a storage medium. The method comprises the following steps: receiving a downloading request sent by terminal equipment when the terminal equipment accesses a new mobile network of an operator; based on the downloading request, downloading a configuration file of an embedded subscriber identity module card installed on the terminal equipment from a cloud server of an operator, and splitting the configuration file into a plurality of data fragments according to a preset data fragment length; coding the plurality of data fragments based on a fountain code algorithm to generate a plurality of data fragment streams, and sending indication information to the terminal equipment; and when a transmission request generated by the terminal device on the basis of the indication information when the network quality of the terminal device meets a preset condition is received, transmitting the data fragment stream to the terminal device until a target number of data fragment streams are transmitted to the terminal device. According to the invention, the problem of repeated downloading failure of the configuration file due to network instability in a weak network environment can be solved.

This invention discloses a UAV swarm communication method and system for resisting channel degradation based on dynamic block-based cooperative transmission, belonging to the field of wireless communication and UAV swarm communication technology. It constructs a network consisting of a ground control station, a cluster head, and multiple UAVs, monitors link status, and selects cooperative nodes under threshold triggering. The network is block-based according to channel capabilities and uses precoding and fountain code concatenation encoding. Strategies and synchronization are issued in the control time slot, while random access and parallel transmission occur in the data time slot. The ground control station receives data out of order and iteratively decodes it, adjusting redundancy and access parameters in a closed loop based on statistical results. This scheme maintains stable transmission under channel degradation and topology change scenarios and is suitable for tasks such as swarm video and radar backhaul.

The invention relates to the field of short-wave communication, in particular to an FBMC-SS peak-to-average power ratio control method based on fountain code shift peak shifting and phase rotation. Through a shift peak shifting and phase rotation strategy, peak signals of different subcarriers are prevented from being overlapped as far as possible, so that the PAPR is reduced, the time domain distribution of coded data packets on each subcarrier is changed by shift peak shifting, the phase relation of the coded data packets on each subcarrier is changed by phase rotation, and the PAPR is reduced. Multiplying individual coded data packets with peak values exceeding a threshold value by a phase twiddle factor, and avoiding generation of the peak values by fine tuning the phase; subsequent subcarriers are subjected to shifting peak shifting and phase rotation in sequence, so that the effect of peak clipping and valley filling is achieved; the method not only can effectively reduce the peak-to-average power ratio of the filter bank multicarrier spread spectrum system and reduce nonlinear distortion, but also can improve the anti-interference capability of the FBMC-SS system in short-wave communication by the fountain code, and ensures the communication reliability.

The invention relates to the technical field of underwater acoustic networks, in particular to a state feedback-based double-set online fountain code and encoding and decoding method for an underwater acoustic network, which comprises an encoding and decoding process under a lossless channel condition and an encoding and decoding process under a lossy channel condition. The double-set online fountain codes adopt a double-set coding strategy in the establishment stage and the completion stage so as to quickly form a maximum connected component; and under the condition of a lossy channel, a state feedback strategy is adopted, so that the coding and decoding efficiency is improved, the number of feedback packets is effectively reduced, and the channel utilization rate is improved. The method shows better performance in the aspects of overhead and the number of feedback packets, and is more suitable for the UANs.

The invention relates to a double-perception online fountain code transmission system and method based on deep reinforcement learning. The system is applied to an underwater wireless sensor network, and comprises a network modeling module which is used for constructing an underwater acoustic sensor network model of a three-dimensional hierarchical clustering topology by adopting a fuzzy clustering algorithm according to spatial distribution and residual energy of nodes, and determining a transmission mechanism of half-duplex underwater acoustic communication; the reinforcement learning optimization module is used for modeling a decoding process of an online fountain code into a Markov decision process and training an agent in combination with a deep learning algorithm to generate an optimal coding degree sequence; and the coding transmission execution module is used for executing the optimal coding degree sequence to generate a coding data packet, performing multi-hop transmission, and performing coding degree switching based on limited feedback triggering until the aggregation node recovers all original data. Based on a half-duplex underwater acoustic communication mechanism, channel conflicts are avoided, the optimal coding degree sequence can be dynamically matched with a decoding state, and the data transmission reliability in an extreme underwater environment is improved.

The invention discloses a secure firmware upgrading method for an electric energy meter, and aims to solve the problems that in a weak network environment, a link loses packets and is out of order, the bandwidth is small, the internal memory of a meter end is limited, and traditional differential and general compression is easy to fail and easy to be decompressed and bomb. According to the method, a Merkel directed acyclic graph resource list is constructed through a limited differential script only containing a copy instruction and an insertion instruction, a double-anchor address and page certificate verification, fountain code redundancy is only carried out on an insertion piece in a window, piece-level hash and node affiliation verification, guard quota control and leading edge pointer monotonically advancing are implemented at a meter end, and the method is simple and convenient to implement. According to the method, the technical effects of stable transmission and high-success-rate upgrading under the weak network, memory depletion and forged chip attack suppression, verifiability and restorability improvement and the like are achieved by using the weak network, writing intention persistence and page sealing witness and not executing general decompression.

The invention discloses an underwater acoustic network dynamic unequal error protection online fountain code transmission method, and particularly relates to the technical field of underwater acoustic network data transmission, the method comprises the following steps: dividing original data into a Most Important Symbols (MIS) set and a Least Important Symbols (LIS) set according to importance, in an establishment stage, adopting an MIS traversal extension window strategy, and in an establishment stage, adopting an MIS traversal extension window strategy to carry out dynamic unequal error protection on the basis of the MIS traversal extension window strategy to carry out dynamic unequal error protection on the basis of the dynamic unequal error protection on the basis of the dynamic unequal error protection on the basis of the dynamic unequal error protection. Based on unequal error protection requirements, dynamically setting a window selection probability, and realizing priority connection and protection of the MIS by adjusting the selection probability of two coding windows; in the completion stage, a sequential window strategy is adopted to preferentially recover the MIS, a dynamic component representative feedback mechanism is designed, and only component representative information in each connected component is fed back, so that the feedback overhead is reduced; and according to the decoding progress and feedback elements fed back by the receiver, the sender dynamically adjusts the data priority to realize closed-loop adaptive transmission. According to the method, the data transmission efficiency can be ensured while the key data in the dynamic environment of the underwater acoustic network is preferentially recovered.

The application relates to the technical field of one-way channel communication, and particularly discloses a self-adaptive space transmission method and system suitable for one-way channels, which comprises the following steps: a channel sending end senses a channel state and adjusts a space transmission mode accordingly; source information is encoded by using a fountain code to obtain N encoded packages; the N encoded packages are respectively spread coded according to the space transmission mode to obtain spread coded packages; the spread coded packages are modulated and amplified to serve as sending signals and are sent out; a part of the sending signals is coupled, the coupled signals are analyzed to determine the current channel state, and the space transmission mode is adjusted accordingly. The method and system can switch decoding modes adaptively at the receiving end after the space transmission mode is changed at the sending end, so that the self-adaptive space transmission of information of one-way channels is realized, and the method and system are suitable for absolute one-way communication link systems containing multiple antennas.

The invention relates to the technical field of low-altitude travel immersive experience, and discloses a VR (virtual reality)-combined low-altitude travel immersive experience implementation method, which comprises the following steps of: constructing a multi-source data storage and distribution architecture based on a distributed hash table, and mapping multi-source data to corresponding nodes; in a data transmission process, original data is segmented by adopting a fountain code technology to generate infinite coding packets; building a multi-modal fusion neural network based on a space-time attention mechanism for interactive recognition, and fusing visual data of a depth camera and data of an inertial measurement unit; a physical environment real-time sensing system is constructed by using a laser radar. By constructing a multi-source data storage and distribution architecture based on a distributed hash table and matching with high-performance data nodes and 10-gigabit Ethernet connection, the effects of improving the data storage and distribution efficiency, accelerating the data transmission speed, effectively balancing the data storage load and avoiding slow system operation caused by overlarge storage pressure of a single node are achieved.

The invention discloses an anchor point synchronous fountain code anti-cutting text watermarking method for a screen shooting scene, and the method specifically comprises the steps: character instance extraction and carrier construction, watermark load construction and blocking, data block generation and in-block error correction, anchor point period mapping and character instance level embedding, screen shooting and cutting attack, watermark extraction and anchor point synchronous cutting. And carrying out data block screening, two-stage fountain recovery and global verification output. According to the invention, reliable recovery of watermark information under the condition of screen camera degradation and local cutting superposition can be realized.

Methods, systems, and apparatuses to encode data for storage in genetic materials. For example, a computing system may segment user data into a plurality of data blocks and generate seed data characterizing a plurality of fountain code seeds. Additionally, the computing system may, for each data block, implement a set of operations that generate one or more data packets. In some instances, the set of operations may include, for each of the plurality of fountain code seeds, determining a bit value and corresponding metaCode value and determining which of the fountain code seeds has a metaCode value of the bit value that matches a value of the bit position identified in the metadata. Moreover, the computing system may, for each data packet, cause an implementation of a second set of operations that synthesize a polynucleotide strand in accordance with at least bit values of the corresponding data packet.