12 results about "Short Code" patented technology

Methods, error correction circuits, and circuit modules using error correction circuits are provided for performing co-bit calculations for error correction by means of circuit complexity reduction. Methods and related devices for co-bit computations for error correction by means of circuit complexity reduction are provided. The method comprises: in an error correction circuit using a predetermined error correction code, configuring a first group of XOR operational circuits in a plurality of XOR operational circuits corresponding to a predetermined codeword length, rather than all XOR operational circuits in the plurality of XOR operational circuits, so as to reduce the circuit complexity of the error correction circuit and improve the error correction efficiency of the error correction circuit. Wherein the first set of XOR operational circuits may be a set of optimized XOR operational circuits implemented based on co-located bit coverage reduction; and performing the co-bit calculation using the first set of XOR operational circuits for error correction corresponding to a shorter codeword length, where a smaller XOR operand and a shorter critical path length can be achieved.

The invention relates to a short code length QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) code construction method based on a Stanley sequence and a genetic algorithm. According to the method, a Stanley sequence is used for forming first two rows of an index matrix meeting the condition that no four rings exist, then a genetic algorithm is used for searching a third row element which enables the index matrix to meet the requirements that the ring length is at least 8 and the number of trap sets is small, and therefore the index matrix with the girth length being at least 8 is obtained, the genetic algorithm can guarantee that the number of the trap sets is minimum, and the number of trap sets is small. And finally, the index matrix is expanded to obtain a parity check matrix of the index matrix, so that four rings and six rings do not exist in a Tanner graph of the check matrix, the number of trap sets is small, the storage space required by code words is small, and hardware implementation is easy. Simulation shows that compared with an HS-QC-LDPC code, an MT-QC-LDPC code and an SES-QC-LDPC code which have the same code rate and code length, the SS-QC-LDPC code constructed by the method has the advantages that the net coding gain is improved to a certain extent, and the constructed SS-QC-LDPC code has better waterfall region performance in a high signal-to-noise ratio region and has no obvious error leveling phenomenon.

The application relates to the communication technical field, and discloses an encoding method, a decoding method, a communication device and a communication system. Based on the method, the error correction performance and the decoding performance under a medium or short code length are improved by twice lifting of a base matrix. Since the element value of the second base matrix after the first lifting is modified, flexible matrix design is realized, the orthogonality between rows of the base matrix is improved, and the error correction performance and the decoding performance are further improved.

This invention relates to airspace coding, specifically to a multi-level unified coding system for low-altitude airspace. The system includes a coding hierarchy architecture module, which designs and constructs an eight-level coding architecture from the national level to the building level; a coding inheritance and short code setting module, which designs inheritance logic to achieve reversible traceability of codes and designs short code rules to improve coding efficiency; a coding fusion module, which combines a planar coordinate framework and altitude coding to achieve integrated coding of planar and altitude spaces; a coding splicing and storage module, which designs coding splicing rules, file naming conventions, directory hierarchy structures, and unified attribute fields to facilitate system storage, parsing, front-end loading, and spatial indexing; and a multi-standard compatibility module, which establishes compatibility conversion rules between grid data and various existing standards to ensure seamless integration with existing industry data systems. The technical solution provided by this invention overcomes the shortcomings of achieving accurate low-altitude airspace division, efficient traceability, and cross-industry data interoperability.

The present application provides a video compression method and device for dynamically adjusting the position of elements of a recent motion vector array in inter-frame prediction coding. The method and device effectively reduce the number of bits consumed in coding motion vectors and greatly improve coding efficiency by dynamically adjusting the elements of the motion vector array with high occurrence frequency to a specific part of the motion vector array and using a short code word to represent the storage address of the specific part.

The invention discloses a specific field text file custom dictionary auxiliary Huffman compression method and system, and belongs to the technical field of data compression. The method comprises the following steps: receiving and verifying a phrase-short code mapping dictionary customized by a user, and ensuring that the length of a short code is smaller than that of an original phrase and ambiguity is not generated; sorting the dictionaries in a descending order according to the phrase length to form a replacement priority queue; performing phrase-to-short code replacement on the text according to a priority sequence by adopting a block processing strategy; carrying out character frequency statistics on the replaced text and constructing a Huffman tree; generating a code based on a Huffman tree, and converting the text into a bit stream; and generating a structured compressed file containing the metadata area, the dictionary information area and the compressed data area. The system comprises a dictionary management module, a text replacement module, a Huffman coding module and a file storage module. According to the method, field specific dictionary preprocessing and Huffman coding optimization are combined, a repetition mode of a specific field text is fully utilized, and the high compression rate of 70%-80% is achieved and is far higher than that of a general algorithm by 40%-60%.

The embodiment of the invention provides a communication method and a communication device. A method includes transmitting a retransmission including one or more cross-CB code blocks, the cross-CB code blocks including a first cross-CB code block generated by encoding a portion of information bits of the CB according to an LDPC code, the retransmission having a code rate lower than a code rate of the initial transmission. Therefore, the receiving device can decode the cross-CB code block in the retransmission of this time. If the cross-CB code block is successfully decoded, the portion of information bits may be considered as frozen bits, which enables the remaining information bits in the last (re-) transmission to be decoded at a lower CR. Embodiments may reduce decoding complexity and improve retransmission performance by decoding a plurality of short codewords.

The application discloses a kind of railway three-dimensional geological space intelligent route selection method and system based on multi-source data fusion, which comprises the following steps: establishing graphic database, creating external database and preprocessing, constructing the three-dimensional entity model of geological body;Based on the graphic template selected by user, the parameter variables of entity object are associated with related design parameters, the track line is obtained, the control point is loaded, the control point is inserted at the specified position and the short code is entered, and the short code corresponds to the geological disaster risk level, the stability of rock-soil mass, the geological safety evaluation information of line crossing area;The track line is obtained, and if the data layer graphic template is selected, the intelligent route selection algorithm layer linkage is executed, and the optimal line scheme is output. By establishing graphic database and external database, fusing multi-source geological, remote sensing and topographic data, constructing three-dimensional geological entity model, and combining graphic template and control point mechanism, the intelligent route selection of railway line is realized.

This application discloses a method, apparatus, device, and storage medium for generating short links, belonging to the field of computer technology. The method includes: receiving a service request from a user terminal, the service request carrying long link information, the service request requesting the generation of N short links, where N is an integer greater than 1; generating N short codes based on a continuous factor, a random factor, and the long link information, each short code being a string, the continuous factor including a first string sequence comprising N regular first strings, and the random factor including N random second strings; performing deduplication processing on the N short codes, and generating N target short links based on the deduplication result, thereby reducing the probability of hash collisions in scenarios with a large number of short link requests and improving the effectiveness of the short links.

The application provides a material attribution type short chain generation method based on a pseudo-random hash algorithm, and relates to the technical field of electric digital data processing. The method comprises the following steps: normalizing and splitting a link service data to generate a plurality of material attribution units and construct offline material attribution basic records; encoding and mapping the offline material attribution basic records to generate a service short code and encapsulate the service short code with a material receiving mark to generate a UrlLink access entrance; performing material paving confirmation and attribution state determination on a material to be paved to obtain a material attribution state determination result and perform state solidification processing on the plurality of material attribution units to generate an activated material attribution short chain; and performing matching verification on a UrlLink receiving field to obtain a matching verification result and generate a branch jump decision instruction to perform a jump operation, so as to realize accurate attribution association of offline material delivery and online access entrance, and improve the attribution recognition ability and data tracing ability of the material attribution short chain.

The invention discloses a double-link coding event triggered nonlinear multi-agent system control method and system, and belongs to the crossing field of automatic control and network security. According to the method, a double-link coding event triggering module is designed, a self-adaptive threshold triggering mechanism and short code word compression are adopted, 16-bit signals are compressed into 3-bit signals, and sensitive information is hidden; the performance boundary is dynamically adjusted through the self-adaptive preset performance strategy module, and the limitation of a traditional method on an initial error is broken through; and in combination with an estimation compensation module, unknown disturbance and virtual control input discontinuity are processed by using a nonlinear disturbance observer and a high-order filter. According to the method and the system, the communication efficiency and the safety can be improved under limited communication resources, the steady-state precision and the global stability of the system under any initial condition and external interference are ensured, and the method and the system are suitable for unmanned vehicle formation, unmanned aerial vehicle cooperation and other scenes.