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93 results about "Probability of error" patented technology

In statistics,the term "error" arises in two ways. Firstly, it arises in the context of decision making, where the probability of error may be considered as being the probability of making a wrong decision and which would have a different value for each type of error. Secondly, it arises in the context of statistical modelling (for example regression) where the model's predicted value may be in error regarding the observed outcome and where the term probability of error may refer to the probabilities of various amounts of error occurring.

Covert communication method based on near-field broadband super-large-scale array beam splitting

The invention provides a covert communication method based on near-field broadband super-large-scale array beam splitting. Comprising the following steps: S1, according to an applied near-field covert communication scene, constructing a corresponding communication model by using a beam splitting effect in a broadband XL-MIMO system, carrying out beam training, and describing a received signal expression of the communication model; s2, constructing a signal detection model of a listener according to a near-field covert communication scene, and describing a detection error probability expression and a covert constraint expression; and step S3, the hidden transmission rate is maximized by optimizing the transmitting power and the subcarrier number of the transmitter. According to the method, the two-dimensional optimization problem related to the transmitting power and the subcarriers is converted into the one-dimensional optimization problem related to the discrete variable quantum carrier number, and the concealment rate of a legal receiver is maximized.
Owner:FUZHOU UNIV

Method for estimating safety communication rate of near-earth satellites by using SDFS cooperating with GLRT

ActiveCN120896635ANetwork topologiesRadio transmissionEarth satelliteLikelihood-ratio test
The invention discloses a method for estimating the safety communication rate of a near-earth satellite by using an SDFS cooperating with a GLRT. The method comprises the following steps: constructing a communication system model between the near-earth satellite and a ground terminal; analyzing the signal and channel characteristics, and obtaining the distance between the nodes, the channel gain and the received signal distribution; under the condition that the transmitting power of each monitoring party is unknown, estimating the transmitting power by adopting generalized likelihood ratio test, and independently executing the generalized likelihood ratio test based on the observation data of each monitoring party; the superior manager performs joint judgment based on a soft decision fusion scheme in combination with the generalized likelihood ratio test result of each monitoring party and a joint threshold so as to estimate the detection error probability of the monitoring party; a joint optimization strategy of the transmitting power and the number of continuous transmission time slots is constructed, and the total throughput of the system is maximized under the condition that the cooperative concealment constraint is met; according to the invention, an innovative solution is provided for reliable communication of the near-earth satellite in a complex monitoring environment.
Owner:NANJING UNIV OF INFORMATION SCI & TECH

Intelligent checking system and method for customs affair compliance

The invention belongs to the field of customs affair auditing, and particularly relates to a customs affair compliance intelligent auditing system and method, and the method comprises the steps: a data collection module synchronously generates an auditing rule updating table and a customs declaration service information table in real time through a multi-mode extraction algorithm; the compliance auditing module completes multi-dimensional compliance verification based on a transverse service auditing node network, a longitudinal service transmission node chain and a declaration node network in combination with a dynamic rule priority index and reinforcement learning algorithm; the evaluation optimization module calculates a service transmission risk probability, an auditing delay probability and an error probability in real time through a bidirectional risk evaluation model, and feeds back the probability to an auditing space to optimize a rule weight and a flow path; through a composite auditing architecture of'declaration clustering + longitudinal encryption transmission + transverse topological association ', dynamic adaptation of auditing rules, accurate risk traceability and intelligent process optimization are realized, and the problems of low efficiency in integration of multi-source heterogeneous data and lagging auditing of complex business scenes in cross-border trade are effectively solved.
Owner:JIANGSU SHENZHOU BOHAI INFORMATION TECH CO LTD

MFT system automatic configuration method and system based on intelligent algorithm

The embodiment of the invention provides an MFT system automatic configuration method and system based on an intelligent algorithm, and belongs to the technical field of automatic control. The method comprises the following steps: preprocessing data, and executing value feature and mode extraction; constructing an MFT domain knowledge graph based on the extracted value features and modes, and optimizing a logic structure of an MFT system by using a genetic algorithm based on the MFT domain knowledge graph so as to generate an optimal logic structure by defining a fitness function; based on a reinforcement learning technology and the optimal logic structure, constructing an intelligent decision model by learning historical operation data; and creating a digital twinborn model of the target MFT system based on the intelligent decision model, verifying the configuration of the MFT system based on the digital twinborn model of the target MFT system, and importing the configuration of the MFT system passing the verification into a practical project. According to the scheme, the manual workload and the error probability are remarkably reduced, and high efficiency, intelligence and automation of the MFT system configuration process are achieved.
Owner:BEIJING GUODIAN ZHISHEN CONTROL TONGDY +1

Performance evaluation method for short packet coding communication

The invention provides a performance evaluation method for short packet coding communication, and belongs to the technical field of short packet communication. The method comprises the following steps that a system model of short packet coding communication is constructed, the system model comprises a ground base station, an unmanned aerial vehicle, a legal user side and a non-target user side which are in communication connection, and a reconfigurable intelligent surface is configured on the unmanned aerial vehicle; and according to all channel state information of the system model, carrying out average reachable secrecy rate analysis, average decoding error probability analysis and secrecy interruption probability analysis on the system model in sequence, and evaluating the performance of the system model according to all analysis results. According to the invention, the safety and reliability of performance evaluation of short packet coding communication can be improved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Buffer area-based auxiliary unmanned aerial vehicle relay covert communication method

The invention discloses a hidden communication method for assisting unmanned aerial vehicle relay based on a buffer area, and the method achieves the maximization of the average throughput of a system through the introduction of the buffer area, and meets the hidden detection constraint of an eavesdropper. Aiming at the characteristics that the position of an eavesdropper is uncertain and the eavesdropper has mobility, the optimal detection threshold of the eavesdropper is deduced, and then a closed expression for detecting error probability is obtained. In the aspect of system optimization, the concealment constraint is converted into a new form, an optimal transmitting power distribution scheme of an unmanned aerial vehicle relay and a friendly unmanned aerial vehicle jammer is designed, and the balance between the communication concealment and throughput is ensured. Meanwhile, the existence of the optimal unmanned aerial vehicle track is proved by analyzing the upper and lower bounds of the throughput of the system, and the optimal receiving and transmitting strategy of the unmanned aerial vehicle relay is provided by combining the size constraint of the buffer area. Numerical simulation and theoretical analysis results show that the method has remarkable effects in improving the average throughput of the system and guaranteeing the communication concealment.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Limited block length optimization method and system of cellular-free communication perception integrated system

The invention discloses a limited block length optimization method and system of a cellular-free communication perception integrated system, and belongs to the technical field of wireless communication. The method comprises the following steps: constructing a cellular-free multi-station cooperative communication perception integrated architecture, and establishing a channel estimation and data transmission model; deducing a closed expression of the communication transmission delay, the decoding error probability and the sensing precision Cramer-Rao bound under the limited block length; analyzing a Pareto optimal boundary of communication and sensing performance by adopting a non-dominated sorting genetic algorithm, and determining a block length feasible region; and designing a dynamic optimization algorithm based on a double-depth Q learning network, and realizing collaborative optimization of the communication performance by adaptively adjusting the block length. The method solves the problem that high communication reliability, low time delay and high sensing precision are difficult to consider in a dynamic environment, the overall performance of the system is remarkably improved, and the method is suitable for high-requirement scenes such as automatic driving and industrial Internet of Things.
Owner:SOUTHEAST UNIV

Covert communication method based on STAR-RIS and full duplex cognitive interference

The invention provides a covert communication method based on STAR-RIS and full-duplex cognitive interference. The method comprises the following steps: establishing a covert communication system model based on STAR-RIS and full-duplex cognitive interference; based on a binary hypothesis testing problem, evaluating a false alarm probability and a missed detection probability of hidden user UR spectrum interception; calculating the false alarm probability, the missed detection probability and the detection error probability of malicious monitor UW detection based on the average receiving power of the malicious monitor UW and the judgment criterion; obtaining the optimal detection threshold and the minimum detection error probability of the malicious monitor UW based on the definition of the detection error probability and the monotonicity of the false alarm probability and the missed detection probability under different classifications; the minimum average detection error probability of the malicious monitor UW is calculated based on the statistical magnitude of the channel hypothesis and the channel power gain. According to the method, the interference signal is transmitted by adopting the full-duplex hidden user, hidden communication is ensured, the inhibition effect of the interference of the direct and cascade double links on monitors in the same area is better, and the probability that information is detected can be effectively reduced.
Owner:HENAN UNIVERSITY

A dynamic transmission control method and system for floating LoRa network

The present invention provides a dynamic transmission control method and system for a floating LoRa network, the method comprising the steps of: presetting an error probability threshold in the LoRa network, calculating a minimum signal-to-noise ratio according to the error probability threshold; calculating a first boundary angle according to the minimum signal-to-noise ratio, and obtaining a first angle interval; calculating data packet delivery rates and data rates corresponding to different spreading factors and polarization angles, calculating a maximum throughput, extracting an optimal polarization angle parameter and an optimal spreading factor parameter according to the maximum throughput, using the optimal polarization angle parameter as a second boundary angle, and calculating a second angle interval; calculating a transmission period according to the second angle interval, and calculating a data packet payload transmitted during the transmission period. The present application calculates a maximum throughput according to the data packet delivery rate and the data rate, finds a second angle interval, transmits in the second angle interval, improves transmission efficiency, calculates a data packet payload size according to the second angle interval, and transmits data in the second angle interval, preventing antenna posture from affecting transmission.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Satellite navigation application terminal multi-fault excitation integrity evaluation method

The invention relates to a satellite navigation application terminal multi-fault excitation integrity evaluation method. The method comprises the following steps: determining a risk source fault mode needing excitation according to a risk source fault mode occurrence probability; converting the integrity risk index into an equivalent omission ratio index, and determining the occurrence probability of each fault mode in the test sample; determining a worst fault amplitude based on a worst fault criterion; constructing an I / II type error probability evaluation model according to the equivalent omission ratio index to quantitatively evaluate the confidence coefficient; determining the number of test samples needing to be collected and an evaluation test threshold according to an I / II type error probability evaluation model, randomly selecting a plurality of test sites in a global range, determining the number of test samples of each test site, and injecting a worst fault into the test samples used in each test site; and collecting a test sample generated by the satellite navigation application terminal and evaluating whether the integrity risk of the satellite navigation application terminal meets the expectation or not.
Owner:HARBIN ENG UNIV

NOMA-based electric energy quality real-time monitoring method, system and equipment

The invention belongs to the technical field of wireless communication, and particularly relates to an electric energy quality real-time monitoring method, system and equipment based on NOMA (Non-Orthogonal Multiple Access). The real-time monitoring method comprises the following steps: firstly, constructing to obtain a distribution power optimization problem of an electric energy quality monitoring system by taking minimization of an overall error probability as a target; the optimization variable of the distribution power optimization problem is the transmitting power of each electric energy quality monitoring terminal device, then a non-convex term in the distribution power optimization problem is converted into a convex term by adopting continuous convex approximation, and the distribution power optimization problem is solved through iteration to obtain a transmitting power distribution optimization scheme; and finally, controlling the electric energy quality monitoring system to carry out electric energy quality monitoring based on the transmitting power distribution optimization scheme. According to the method, the overall error probability can be reduced by optimizing a terminal equipment transmitting power distribution scheme, so that high communication reliability in a multi-terminal equipment scene is ensured.
Owner:STATE GRID HUBEI ELECTRIC POWER INFORMATION & TELECOMMUNICATION COMPANY +1

A quantum error correction method

PCT designated stageWO2025248232A1Quantum computersDatasheetQuantum devices
Disclosed herein is a computer-implemented quantum error correction method for decoding errors in a quantum computer system. The quantum computer system comprises a decoder apparatus and a register of quantum devices. The method comprises receiving, at the decoder apparatus, syndrome data in an initial state, the syndrome data being representative of an error state of the quantum devices in the register of quantum devices, and graph data representative of a graph comprising a plurality of error nodes and a plurality of check nodes. The error nodes represent error mechanisms that can occur on the register of quantum devices. Each check node is associated with one or more measurements which can be performed on the register of quantum devices. The initial state of the syndrome data indicates a check value of marked or unmarked for each check node based on an outcome of its associated one or more measurements. The method further comprises determining, based on a statistical model of error rates associated with the error mechanisms, an error probability associated with each of the one or more error nodes; and generating modified graph data by iteratively performing linear operations on the graph data and syndrome data based on a current state of the syndrome data to determine an independent error node associated with each marked check node. The method also comprises determining, by the decoder apparatus, a correction for the error state based on the modified graph data and, optionally, based on the error probabilities associated with the one or more error nodes.
Owner:RIVERLANE LTD

Hidden NOMA communication method based on STAR-RIS partition cooperative interference

The invention provides a hidden NOMA communication method based on STAR-RIS partition cooperative interference, and the method comprises the steps: building a STAR-RIS assisted hidden communication system, and enabling the STAR-RIS to be virtually divided into an enhanced transmission region and a cooperative interference region; calculating the communication interruption probability of the hidden user, and simplifying the communication interruption probability by utilizing the probability distribution of the intermediate variable; based on a binary hypothesis testing problem, determining a receiving signal and average receiving power of a malicious monitor, determining a minimum detection error probability of the malicious monitor adopting an optimal detection strategy, and calculating a lower bound of the minimum detection error probability; determining a concealment constraint; and establishing an optimization problem according to the communication interruption probability and the concealment constraint of the concealed user, and solving the optimization problem by adopting an alternating iterative optimization algorithm to obtain the optimal values of the power distribution coefficient and the area unit number of the enhanced transmission area. According to the invention, the transmission reliability and concealment can be improved by using the information relay and interference dual functions of STAR-RIS, and the spectrum utilization rate can be improved through regional cooperation.
Owner:HENAN UNIVERSITY

A polar code SCLF decoding method based on an improved first key set

The application particularly relates to a polar code SCLF decoding method based on an improved first key set, and belongs to the technical field of channel coding, which takes the first key set as an initial key set, then calculates a theoretical value of bit unreliability by using a channel error probability, calculates an actual value of the bit unreliability by using a path metric value obtained through CA-SCL decoding, compares the actual value of the bit unreliability with the theoretical value, identifies error bits containing SC state paths in the first key set, arranges the error bits in ascending order of channel reliability to form an improved first key set, and finally exchanges decision results on SC state paths in the improved first key set when the first CA-SCL decoding fails. Simulation results show that the method has better error performance and lower complexity compared with RCS-SCLF and D-Post-SCLF decoding methods, and can be combined with a small list CA-SCL decoder to achieve the performance of a large list CA-SCL decoder.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Adaptive frequency domain equalization method for underwater acoustic OFDM communication using transformer

The application discloses a kind of underwater acoustic OFDM communication adaptive frequency domain equalization methods using Transform, it is related to underwater acoustic communication technical field, to solve the problems that existing underwater acoustic OFDM equalization method relies on cyclic prefix, is not sensitive to channel dynamic change, hard decision is prone to error propagation, the Transform framework containing only encoder is used in the present application, the soft decision of received symbol is completed by multi-head self-attention mechanism, and adaptive filtering is realized in combination with feedforward network;In the training phase, the loss function is calculated based on the network output and the true value, and the network parameters and the feedforward equalization filter coefficients are updated synchronously;In the inference phase, the network output is fed back to update the filter coefficients, and the real-time changes of the channel are adapted;The present application significantly reduces the probability of error propagation, and improves the communication reliability under complex underwater acoustic channel.
Owner:KUNMING UNIV OF SCI & TECH

Channel reencoding to reduce invalid physical downlink control channel signals

A device may receive a PDCCH signal, may decode encoded bits of the PDCCH signal to generate coded bits, may reencode the coded bits, and may calculate a detection error probability of each coded bit at an output of soft demodulation. The device may calculate a channel decoding error probability that cyclic redundancy check bits are still attached to the coded bits, and may calculate an error probability of channel reencoding, of each coded bit, due to error propagation of polar decoding and reencoding. The device may calculate a probability density of a BMR associated with the coded bits, and may calculate a threshold based on the detection error probability, the channel decoding error probability, the error probability of channel reencoding, and the probability density of a BMR. The device may determine that the PDCCH signal is invalid based on the BMR being greater than the threshold.
Owner:VIAVI SOLUTIONS INC(US)

A wireless covert detection method and system based on intelligent reflecting surface assistance

The application discloses a wireless covert detection method and system based on intelligent reflecting surface assistance. The method is as follows: a system model is established, and detection error probabilities of a legal receiver and an illegal detector are derived; an optimal detection threshold is obtained by analyzing an expression of the detection error probability, and the detection error probability is determined; a joint optimization problem of an intelligent reflecting surface phase shift matrix and a transmission power is established; a lower bound of the optimization problem is selected to simplify the optimization problem, and a simplified optimization problem is obtained; the simplified optimization problem is solved, and an optimal intelligent reflecting surface phase shift matrix is determined, and a feasible transmission power is selected to meet a covert constraint requirement. The system comprises a model establishment module, a detection error probability determination module, a joint optimization problem construction module, an optimization problem simplification module and an optimal intelligent reflecting surface phase shift matrix determination module. The application improves the detection performance of the legal receiver, and reduces the detection performance of the illegal detector, so that the requirement of the covert constraint is met.
Owner:HAINAN UNIV

Coal mine wireless communication system and method

The invention belongs to the technical field of wireless communication networks, and discloses a coal mine wireless communication system and method. The method comprises the following steps: firstly, constructing a coal mine wireless communication model, wherein the coal mine wireless communication model comprises a plurality of servers and a plurality of sensors; then, based on a coal mine wireless communication model, constructing an end-to-end error probability minimization problem taking a sensor-server matching strategy, a code length and transmitting power as optimization variables; and finally, solving an end-to-end error probability minimization problem, determining a matching strategy, and obtaining a code length-transmitting power allocation optimization scheme. And performing coal mine wireless communication configuration based on the distribution optimization scheme. According to the invention, the end-to-end reliability in a coal mine wireless transmission scene can be improved.
Owner:XIAN UNIV OF SCI & TECH

Adaptive pilot transmission method for FDD massive MIMO system

The application discloses a kind of adaptive pilot transmission methods suitable for FDD Massive MIMO system, utilize the stage stationary nature of channel and divide time-varying non-stationary channel into multiple stationary channel blocks, and respectively carry out coherence time estimation to multiple stationary channel blocks, and the pilot transmission interval currently used is decided by coherence time.The steps mainly include channel correlation estimation and pilot interval selection.The application carries out high confidence interval estimation to channel correlation, controls the error probability of coherence time estimation, and tries to avoid the influence of system throughput caused by overestimation of coherence time;The application estimates coherence time using threshold method, and according to the relationship between threshold and system effective signal-to-noise ratio, the threshold setting method is given, so that the adaptive pilot method can meet the demand of channel capacity for specific task.
Owner:NANJING UNIV

A microprogram configuration method and system

The present invention provides a microprogram configuration method and system, which relates to the field of microprogram design technology. By receiving a microprogram request from a first user, performing authentication and certification according to the first user, and obtaining the first user authentication and certification result, when the first user authentication and certification result is passed, a matching microprogram is activated, and a microprogram configuration plan is generated according to the microprogram request. According to the microprogram configuration plan, the matching microprogram is configured in combination with a microprogram controller. The method achieves the technical effect of significantly reducing manual intervention, reducing the probability of error, realizing efficient and flexible configuration of microprograms, and improving configuration efficiency and accuracy. The method solves the technical problem in the prior art that microprogram configuration relies on manual intervention, resulting in low configuration efficiency and accuracy, and insufficient flexibility. The method achieves the technical effect of significantly reducing manual intervention, reducing the probability of error, realizing efficient and flexible configuration of microprograms, and improving configuration efficiency and accuracy.
Owner:BEIJING LIANXUN XINGYE TECH CO LTD

Method and system for mutual indexing of lookup table fields

The invention relates to the technical field of computer communication, in particular to a method and system for mutual indexing of lookup table fields, and the method comprises the following steps: S1, reading and caching all script files; s2, reading a table name and a field name of a table of which the index needs to be detected; s3, traversing all the script files in the step S1, and searching and recording the script files referencing the table names read in the step S2; step S4, for the script file recorded in the step S3, searching whether the field name in the step S2 is acquired line by line, and if so, reading the table name and the field name referenced by the acquired field name; when other configuration tables need to be indexed in the detection configuration table, the reference relation can be automatically detected, the situation that the reference relation is manually filled in by adding fields is avoided, compared with the situation that the reference relation is manually filled in, time can be saved, the error probability can be reduced, tool processing can be conducted when the configuration table is added, deleted and modified, and the project progress is accelerated.
Owner:FUJIAN TQ DIGITAL

Hidden performance detection optimization method in IRS-UAV information transmission

The invention relates to the technical field of communication security, and discloses an IRS-UAV information transmission concealment performance detection optimization method, which comprises the following steps: constructing a closed analytic model; based on a closed analytic model, a legal communication link is based on adjustment of the number of reflection units so as to maximize the detection error probability; based on the closed analytic model, the illegal communication link is based on the adjustment of the detection threshold to minimize the probability of detection error. According to the method and the device, the problem that the optimal detection performance cannot be kept in a changing environment due to fixed or independent optimization of parameters in the prior art is solved, so that the system can re-calculate the optimal parameter combination according to the real-time channel state, the global lowest point of the detection error probability in the current environment is locked, and the detection accuracy is improved. Therefore, the reliable detection capability and the robustness in a complex confrontation environment are obviously improved.
Owner:湖南工商大学

Engineering mechanical equipment calling method and system based on big data

The invention relates to the technical field of information and communication technologies specially suitable for management or supervision, in particular to an engineering mechanical equipment calling method and system based on big data, and the method comprises the steps: obtaining a demand order, determining a longest calling route, executing callable equipment based on a target mechanical equipment library, and determining callable allowance. Obtaining specific information of callable equipment; determining a calling result of the callable equipment based on the longest route; and obtaining an optimal strategy based on a calling result. According to the method and the device, the called mechanical equipment is accurately determined, the error probability of selecting and calling the mechanical equipment is reduced, and the mechanical equipment is accurately and clearly called.
Owner:JIANGSU JIAOTONG COLLEGE +1

A code generation method for a low-code development platform

The present invention relates to the technical field of low-code development, and particularly relates to a code generation method for a low-code development platform. Based on the similarity between different statements, the present invention obtains the attention degree of each module and the high-similarity text segments; according to the relative distance between the word segments of the statements within the high-similarity text segments, a plurality of word segment clustering clusters are obtained; the similarity and sentiment features of the word segments of the statements between different word segment clustering clusters and the annotation fields of the modules are analyzed to obtain the overall sentiment intensity score of each module; furthermore, the error probability of each module is obtained, and the high-probability error modules are screened out; combining the similarity of the annotation fields between each high-probability error module and each other module, the substitution degree of each other module relative to each high-probability error module is obtained; and the modules of the low-code development platform are updated. The present invention updates the modules by accurately evaluating the error probability of the modules and analyzing the substitution degree of other modules, thereby improving the accuracy of code generation.
Owner:陕西开物智联科技有限公司

A probabilistic jamming UAV-assisted wireless covert communication method and system

The present invention discloses a probabilistic jamming UAV-assisted wireless covert communication method and system, comprising the following steps: constructing a transmission model and a communication process of the communication system; obtaining a signal received by a UAV, a forwarded signal of the UAV, and a forwarding amplification factor according to the transmission model and the communication process; during the signal forwarding process, a detector determines whether the UAV has signal forwarding by analyzing the transmitted signal of the UAV; the detector performs a binary hypothesis test based on the received signal, and obtains Willie's two detection error probability expressions according to the Neyman-Pearson optimal decision rule; constructing an optimization problem based on the effective concealment rate that can be obtained by the destination node under the condition that concealment constraints are met, and solving the optimization problem to obtain the maximized concealment rate; designing a source node function so that it sends probabilistic interference to confuse the detector's detection, thereby assisting the transmission of secret information, improving system performance through concealment performance constraints, and maximizing the final concealment rate that can be obtained.
Owner:XIAN UNIV OF POSTS & TELECOMM

Communication method and communication device

A communication method and a communication device based on LDPC codes, in the method, a device can perform encoding or decoding based on an LDPC check matrix, the LDPC check matrix is determined based on an LDPC basis matrix, the basis matrix comprises an extended check matrix, the extended check matrix is a lower triangular matrix with diagonal elements being 1, the extended check matrix comprises a plurality of lower triangular matrixes, and the lower triangular matrixes are arranged in the extended check matrix. The diagonal elements of each lower triangular matrix in the plurality of lower triangular matrixes are located on the diagonal of the expanded check matrix, the positions of the diagonal elements of the plurality of lower triangular matrixes are not overlapped, and the remaining elements in the expanded check matrix except the diagonal elements of the expanded matrix and the plurality of lower triangular matrixes are all 0 elements. According to the method, the column weight of the check area can be improved, the probability of error floor occurrence can be reduced, retransmission in some specific columns can be supported, and therefore the method can be compatible with an IR-HARQ scheme of LDPC codes of 5G.
Owner:HUAWEI TECH CO LTD

Two-way relay-based covert communication method and system for power monitoring network

The invention discloses a two-way relay-based covert communication method and system for a power monitoring network, and the method comprises the steps: constructing a transmission model and a communication scheme of a two-way relay covert communication system, and enabling nodes in the transmission model to comprise two legal information sources S1 and S2, a relay R and a covert user B; according to the transmission model and the communication scheme, obtaining a necessary condition for uninterrupted communication and a necessary condition for the relay to carry out covert communication; a joint detection mechanism is determined, and in covert communication, two legal information sources jointly serve as detectors and are independently detected; jointly making a judgment result according to the respective detection results of the two legal information sources; and determining a two-way relay-based covert communication performance evaluation method, and determining the total detection error probability of the system and the effective covert transmission rate of the covert user under the condition of meeting the covert constraint condition. The method can be used for realizing the positive hidden transmission rate under the two-way relay network.
Owner:JIANGSU UNIV OF SCI & TECH +1

Satellite navigation application terminal integrity evaluation method considering non-Gaussian error

PendingCN120370347ASatellite radio beaconingIntegrity assessmentAlgorithm
The invention relates to a satellite navigation application terminal integrity evaluation method considering a non-Gaussian error. The method comprises the following steps: 1) determining an error source of a satellite navigation application terminal needing to be considered in a test environment and constructing an error model; 2) establishing a basic test scene of distance measurement error non-Gaussian distribution; 3) determining a fault mode occurrence probability and a fault mode which needs to be excited for integrity evaluation; 4) obtaining the corresponding fault mode occurrence probability of the integrity test sample under each risk source; 5) determining the worst fault and amplitude under the non-Gaussian distribution condition; (6) constructing an I / II type error probability evaluation model, and determining the minimum number of test samples needing to be collected and an evaluation test threshold; 7) randomly selecting a plurality of test sites, determining the number of test samples used by each test site, and injecting the worst fault and amplitude into the test samples; and 8) collecting a test sample generated by the satellite navigation application terminal, and evaluating whether the integrity risk of the test sample meets the expectation or not.
Owner:HARBIN ENG UNIV

Decision fusion method and system in multi-listening scene of covert communication

The application discloses a decision fusion method and system in a multi-listening scenario in covert communication and belongs to the technical field of wireless communication. The method comprises the following steps: configuring a limited total block length for each listening node, and dividing the total block length into a detection block length and a transmission block length; each listening node performs local signal sensing, generates a local decision result by using the detection block length, and sends the local decision result to a fusion center by using the transmission block length; the fusion center allocates an optimal fusion weight for each decision result based on the local detection performance and the transmission performance of each listening node according to the criterion of minimizing the global detection error probability; the fusion center calculates a weighted sum based on the fusion weight and the corresponding decision result, compares the weighted sum with an optimal decision threshold of the fusion center, and makes a global decision on whether the target signal exists. The application realizes the optimal performance of a whole link from sensing to fusion, and improves the reliability and accuracy of signal detection.
Owner:SHANDONG NORMAL UNIV

Unmanned aerial vehicle assisted short packet covert communication method based on ground node cooperative jamming

The application claims a kind of unmanned aerial vehicle assisted short packet covert communication method based on ground node cooperative interference, the theoretical lower bound of detection error probability is deduced, and then the exact robust concealment constraint condition is built.In terms of system optimization, the highly coupled non-convex objective problem is decomposed, and a joint optimization scheme of unmanned aerial vehicle transmission power, interference beam forming, multi-user scheduling decision and flight trajectory is designed to ensure the balance between covert communication and multi-user resource allocation fairness.Meanwhile, by integrating continuous convex approximation and semi-positive relaxation technology, combined with generalized Benders decomposition algorithm, effective decoupling of discrete decision variables and continuous physical variables is realized, and an alternating optimization solution strategy with strict theoretical convergence guarantee is proposed.Numerical simulation and theoretical analysis results show that the application significantly outperforms existing benchmark schemes in improving the average transmission rate of the worst user, with significant superiority.
Owner:CHONGQING UNIV OF POSTS & TELECOMM