67 results about "Short Code" patented technology

The invention discloses a polarization code and multi-bit even parity check code cascaded error correction coding method. The method comprises the steps: a transmitting end encoder utilizes a multi-bit even parity check code as an outer code, and utilizes a polarization code as an inner code; a receiving end decoder decodes by utilizing a modified successive cancellation list (SCL) decoding algorithm. On the aspect of error correction performance, comparing with the prior art utilizing middle-short code length non-cascaded polarization codes of the SCL decoding algorithm, the polarization code and multi-bit even parity check code cascaded error correction coding method has the advantages that frame error rate performance of a system can be remarkably improved, and a maximum likelihood bound (ML Bound), which cannot be broken through by the SCL decoding algorithm, can be remarkably broken through. On the aspect of engineering realization, according to the polarization code and multi-bit even parity check code cascaded error correction coding method, the outer code utilizes the multi-bit even parity check code, which is simple to code; the modified SCL decoding algorithm is utilized to decode, bit decision and even parity check are combined to be carried out in a decoding process, and compared with the original SCL decoding algorithm, the method provided by the invention does not increase the decoding complexity, and facilitates the engineering realization.

According to this invention, encoded data of a target data amount can be generated by one image input operation while both lossless encoding and lossy encoding are adopted. For this purpose, a first encoding unit which generates lossy encoded data, a second encoding unit which generates lossless encoded data, and an attribute determination unit which detects the number of colors in a pixel block to be encoded parallel-process the same pixel block. When the number of colors in the pixel block of interest is equal to or smaller than a predetermined number, an encoding sequence control unit stores lossless encoded data in a first memory. When the number of colors exceeds the predetermined number, the encoding sequence control unit stores encoded data of a shorter code length among lossy encoded data and lossless encoded data in the first memory.

System and method for decoding variable-length codes. A variable-length decoder includes an address generator and a local memory unit. The local memory stores a variable-length code look-up table. The local memory can be programmed to include a look-up table supporting substantially any decoding algorithm. In one embodiment, a decoder memory unit and a system memory unit are employed together with the local memory to store a codeword look-up table. The shortest codes are stored in local memory, the next shortest in decoder memory, and the longest codes are stored in system memory. A multistage search algorithm is employed to search for the longest codes. The address generator generates the address of the code table to be searched by adding the value of the bits to be searched to a base address.

The invention provides a signaling coding method and a signaling coding system based on BCH code and short LDPC code cascading. The method comprises the following steps: establishing a zero padding group table of the correspondence between the sequences of zero padding groups divided in turn and the positions of the zero padding groups based on a default LDPC code check matrix and establishing a punching group table of the correspondence between the sequences of punching groups divided in turn and the positions of the punching groups based on the default LDPC code check matrix; zero-padding an input signaling after scrambling treatment according to the zero padding group; sequentially calculating the BCH code check bit and the LPDC code check bit corresponding to the signaling after zero padding based on preset BCH code and LPDC code error correction coding parameters; and determining the number of punching bits of the LPDC code check bit based on the preset linear relationship between the code length of the signaling and the number of punching bits, and punching the LDPC code check bit according to the number and according to the punching group table.

The invention discloses a carrier synchronization method based on coding and pilot frequency joint assistance. The method comprises the steps that: first, an LDPC-Hadamard code with a short code length and low code rate is designed, an optimal pilot frequency structure is designed based on a valuation theory, a carried rough synchronization method is designed based on correlation functions and ideas, and the valuation precision can reach a Cramer-Rao bound (CRB); and then soft demodulation and decoding operation are carried out on a roughly synchronized signal, soft modulation is carried out on soft information which is output after decoding, and the fine synchronization of carrier is carried out with the soft modulation signal based on expectation maximum algorithm. Simulation shows that the high-order QAM carrier synchronization method based on coding and pilot frequency joint assistance can greatly improve the carrier synchronization accuracy and scope, reduce the decoding times of a decoder, and work in deep space, a satellite and other communication systems with low signal-to-noise ratio.

The present invention provides a data lossless remote code updating method and apparatus. The method comprises: S1, a server side sends a ProcessAppInfoMsg frame, the frame transmits a total byte number and a total packet number of a code to a controller, the controller writes the total byte number and the total packet number of the code into a designated position of an SD card for a checking frame to check, and the controller returns the ProcessAppInfoMsg frame; S2, the server side sends the ProcessAppInfoMsg frame, a controller side checks the frame according to a check code of the frame and if the frame is correct, the codes are written into corresponding addresses of the SD card according to a record format of the SD card; S3, the server side sends the ProcessAppInfoMsg frame, the frame is sent after code frames are sent, a 32-bit total checksums of all the codes is recorded in the frame, checking is successfully carried out if a 32-bit total checksum of all the code frames read from the SD card is equal to that of all the codes, or error information is carried by a return frame of the frame and a server is requested to resend the frame; and S4, the server side sends the ProcessAppInfoMsg frame, a user application skips to the position of a bootloader after receiving the frame, and the bootloader completes the code updating operation. The data lossless remote code updating method and apparatus have the advantages of short code updating time and lossless data.

A generator generates a composite code from dithered copies of a reference code to form an optimal stationary dither code. The generator either dithers the length of the reference code to generate a boundary dither code composed of a series varying length short codes, or it dithers the phase of the reference code to generate rotation dither code composed of a series of fixed length short codes that vary in phase. The generator dithers the reference code according to a dither pattern. The composite code is an optimal dither code, having an optimal autocorrelation properties, by generating a dither pattern in which phase vectors for the constituent code are not repeated within the code.

The invention relates to the field of artificial intelligence, in particular to an oil and gas well liquid level intelligent monitoring method and device. Characteristic data in the oil and gas well in the current time period are collected; calculating the abnormal degree of the feature data at each moment; calculating the transmission urgent degree of the feature data; grading the feature data in the current time period, and calculating an adjustment coefficient of the feature data of each grade; constructing an adjustment coefficient sequence of each level of feature data; performing Huffman coding according to the adjustment coefficient sequence of the feature data of each level in the current time period, correcting the duration of the next acquisition time period to obtain a coding result of each time period, and transmitting the coding result; and decoding the coding result to obtain oil and gas well characteristic data, and regulating and controlling oil and gas well parameters according to the abnormal degree of the characteristic data. According to the method, the problem that the abnormal data is not the shortest code value in the traditional Huffman coding is solved by calculating the adjustment coefficient, and the rapid and accurate transmission of the abnormal data can be realized.

The invention belongs to the technical field of signal processing, and particularly relates to an aperiodic long-code direct sequence spread spectrum signal time delay estimation method and system based on norm fitting, and the method comprises the steps: carrying out the carrier synchronization and timing synchronization of a received signal, and obtaining an aperiodic long-code direct sequence spread spectrum CDMA baseband waveform; modeling the long code direct sequence spread spectrum signal into a short code direct sequence spread spectrum signal containing missing observation, rearranging the baseband waveform into a missing data matrix according to the code element width of the information code, and obtaining an F norm curve of the missing data matrix; setting an equivalent period,representing the missing data matrix as cyclic repeat representation of a cellular matrix, and obtaining a user signal F norm curve square template according to the cellular matrix and the screening matrix; and modeling the multi-user signal F norm curve as cyclic convolution of a template curve, and solving the model by using a least square method to obtain an out-of-step time parameter of each user. According to the method, the time delay estimation of the high-capacity asynchronous NPLCDSSSCDMA system under the non-cooperative receiving condition can be realized, and the operation complexity of the system is effectively reduced while the good estimation precision is ensured.

The invention relates to a Chinese character input method, in particular to a computer type code Chinese character keyboard technology. The computer type code Chinese character keyboard technology has the main characteristics of few code elements, short code strings, no repeated codes, code-character one-to-one correspondence, touch typing, difficulty in forgetting, and high in regularity. The computer type code Chinese character keyboard technology adopts a design principle that basic unit strokes which composite Chinese characters serve as unique coding elements; on the basis of essential attributes, the strokes are divided into three classes, namely horizontal strokes, vertical strokes and slant strokes; on the basis of structural attributes, the strokes are divided into single strokes, composite strokes and crossed strokes; and on the basis of dimension and coupling attributes, the strokes are divided into main strokes, auxiliary strokes and body strokes. Coding is performed according to the natural state of the strokes in a character, Chinese characters can be input on keyboards with various key orders by using a set of codes, and the codes are true universal codes for the Chinese characters.

The invention provides a QKD post-processing system and method based on a CRC-SCL decoding algorithm, the system comprises a sender and a receiver, the sender comprises an information interaction unit, a parameter estimation unit, an error correction unit and a confidential amplification unit; the receiver comprises an information interaction unit, a parameter estimation unit, an error correction unit and an amplification unit. According to the continuous variable quantum key distribution characteristic, performance characteristics of error correction codes with different code lengths are combined, on the basis of classical multilateral LDPC code multidimensional negotiation, the polarization codes are introduced for cascade decoding, the excellent error correction performance of the polarization codes based on the CRC-SCL decoding algorithm in medium and short code lengths is fully utilized, and finally decoding is completed. According to the method, the data coordination efficiency is improved, the error correction efficiency is guaranteed, the quantum key generation rate of the QKD system is further improved, and the overall performance of the system is guaranteed.

The invention discloses a polar code fast serial cancellation list decoding algorithm based on bit flipping. According to the algorithm, the decoding rate is increased by adding identification of fourspecial nodes; meanwhile, a critical set is constructed, error propagation caused by previous decoding errors is avoided; a turnover position is judged and determined by respectively calculating loglikelihood ratio (LLR) values of two special nodes, namely an information bit R1 node and a single parity check (SPC) node; when the parity check bit does not meet the requirement, only the information bit corresponding to the most unreliable input LLR needs to be overturned, so that the overturning frequency is reduced, and the complexity is reduced. Simulation results show that when the block error rate is 10 <-5 >, the signal-to-noise ratio of the improved fast SCL decoding algorithm based on bit flipping is improved by 0.09 dB compared with that of an original SCL decoding algorithm basedon bit flipping, so that the improved decoding algorithm provides a reference algorithm under the condition of medium and short code lengths.

The present invention provides a rapid keyboard input method of computer Pinyin codes. The theory of the method is as follows: initials, finals and tones are defined on the key elements of a keyboard; for a fixed final in a Pinyin scheme, the fixed final is inputted by double-clicking the key element belonging to the final, and other initials and finals can be inputted by clicking respective key elements. The method has the following outstanding characteristics of: a simple input rule, straightforwardness, convenient operation, a high input speed, no need to dismantle character patterns, no need to remember, a large code capacity, a short code length and a good word-building effect.

The invention discloses an encoding method of a Turbo code and a decoding method. The encoding method comprises: on the one hand, directly carrying out low-order modulation on externally input information bits x(k), currently outputting information bits, and marking the same as x''(k); sending the information bits x(k) into a first sub-encoder at the same time; firstly receiving the information bits x(k) by the first sub-encoder, and outputting check bits y(k); appending zeroing bits at the tail part of the x(k) at the same time to enable the first sub-encoder to be in a zero state after encoding is completed; marking the x(k) and the zeroing bits as x'(k); using an interleaver to scramble the order of the x'(k), then sending the same to a second sub-encoder, and outputting check bits z(k); directly carrying out high-order modulation on the check bits y(k) and z(k), carrying out combining to form a symbol yz(k), and outputting the same at the same time; and carrying out alternate switching of a multiplexing module mux on the x''(k) and the yz(k), then alternately outputting the x''(k) and the yz(k), and obtaining a data stream Rx(k) with a code rate as 1/2. The method achieves gooderror correction capability of the Turbo code under a short code condition; and uses the code rate of 1/2 to achieve performance better than that of an existing code rate of 1/3. The method is suitable for use in the field of digital communication.

The invention provides a method and device for generating an aperiodic long-code spreading code, equipment and storage medium, and a storage medium. The method comprises the following steps: determining a primitive polynomial and an initial phase of a local short-period spreading code according to a PRN number, a weekly count and an intra-weekly day count of a satellite; generating a period short code according to the primitive polynomial and the initial phase; capturing a burst frame according to the periodic short code, and performing frame synchronization; generating a first m sequence according to the primitive polynomial and the initial phase; processing the m1 sequence to obtain a decoding result of the user address; obtaining a second m sequence according to the primitive polynomial and the decoding result of the user address; and generating a spreading code of the data segment according to the m1 sequence and the m2 sequence. According to the invention, the aperiodic long-code spreading code with the variable initial phase can be generated, and the interference of illegal users is effectively avoided.

Systems, methods, apparatus, and computer program products are provided for facilitating immediate activation of a promotion. One example embodiment may include an apparatus for facilitating immediate activation of a promotion, the apparatus comprising registration circuitry configured to receive promotion component information, the promotion component information comprising one or more products or services and a price, generate a promotion comprising the promotion component information, and assign promotion identification information to the promotion; and activation circuitry configured to receive information provided in a text message, the text message comprising at least the promotion identification information, a command, the text message addressed to a short code, the command indicative of an instruction to perform with regard to the promotion identified by the promotion identification information.

The invention relates to the field of communication security. The invention discloses a cascade decoding method suitable for CV-QKD system data post-processing. The method comprises: by using a mode of combining long-code-length coding and medium-short-code-length coding, firstly performing error correction by using long-code-length coding so that the number of errors can be quickly reduced to a preset threshold value within a small number of iterations; then reducing the length of the error correction code, regrouping all bits, verifying the code words of the groups of the receiving party andthe transmitting party based on a verification function, performing error correction on the code word groups with inconsistent verification results by adopting medium-short code length coding, and finally correcting all errors to finish decoding. According to the method, the advantages of coding technologies with different code lengths are fully combined, and the error correction rate is increased while the error correction success rate is ensured, so that the overall performance of a CV-QKD system is ensured.