163results about How to "Strong error correction ability" patented technology

The invention discloses a channel-polarization-based encoder for a staggered structure duplication code, and an encoding method and decoding methods thereof. The encoder consists of a duplication bit buffer with a storage capacity of L bits, a bit position mapper with a length N and a channel polarization device with the length N which are connected in sequence. The encoding method based on the encoder comprises the following steps of: embedding duplicated encoding into a channel polarization process, and introducing a duplicated relationship between parts of the bits of code blocks transmitted in sequence during the channel polarization for encoding. In addition, the invention further provides two decoding methods, which comprise the following steps of: decoding by using a simple and rapid successive cancellation (SC) algorithm, and performing iterative decoding by using a Tanner-graph-based belief propagation algorithm with excellent performance. On the basis of the innovative structure encoder, the encoding and decoding methods provided by the invention are stronger in error correction capability under the condition of not increasing the decoding complexity, and the transmission performance is obviously improved. The encoding and decoding methods are particularly applicable to an actual communication engineering system and have a good popularization and application prospect.

The invention discloses a coder based on repeated coding and channel polarization and a coding/decoding method thereof. The coder comprises two coding modules with the same structure; each coding module is provided with a repeated coder group, a bit position mapper with the length of N and a channel polarization device with the length of N, wherein the repeated coder group has m*L output ports and is composed of L sequentially-arranged repeated coders with the repeating times of m; and the two coding modules are connected together through a coding mode selector between the repeated coder and the bit position mapper. The invention provides a concrete method of embedding repeated codes in the channel polarization process to perform channel coding and decoding based on the coder; and compared with the polarization code of the limited length in the prior art, the coding/decoding method disclosed by the invention has stronger error correction capability and obviously improves the transmission performance on the premise of rarely increasing the decoding complexity, is particularly suitable for the practical engineering systems of mobile communication, satellite communication, underwatercommunication and the like, and has good popularization and application prospects.

The invention relates to a polarization code decoding method for cyclic redundancy check assistance. When a polarization code is decoded, in all the routes with cyclic redundancy check values of corresponding bit estimation sequences of being zero from a root node to leaf nodes on a code tree corresponding to the polarization code, one route with maximum reliability metric value is searched by taking a list or stack as assistance for route search, and the bit estimation sequence corresponding to the route is output as a decoding result. The method comprises the following operation steps of: determining parameters according to a search assistance method, constructing an auxiliary structure of the decoding method, searching a candidate bit estimation sequence and executing cyclic redundancy check. By adopting the method disclosed by the invention, error correcting capability of a communication system which adopts the polarization code as channel coding is greatly improved, operation steps are simpler, and operation complexity is equivalent to or even lower than that of a Turbo code coding and decoding method used in a WCDMA (wideband code division multiple access) system, thus the method disclosed by the invention has a good practical prospect.

A communication node which can reliably transfer a packet with a payload including data having error resistance in radio environments is disclosed. A packet to be transmitted is divided into segments to form a plurality of packet segments. From among a plurality of error correction schemes that have been prepared in advance, the scheme to be employed is selected for each of the packet segments in accordance with predetermined criteria, and the selected error correction scheme is applied to each packet segment. Subsequently, the processed packet segment is transmitted to the network. Packet segments are received from the network. From among a plurality of error correction schemes prepared in advance, the scheme to be employed is selected for each of the received packet segments based on predetermined information contained in each received packet segment, and the selected error correction scheme is applied to the received packet segment. An original packet is formed from the plurality of processed packet segments.

The invention provides an anti-single-event-upset error checking and correction method for memory, which comprises: (1) receiving K-bit information data from CPU; (2) generating N-bit check data A corresponding to the K-bit information data; (3) storing the K-bit information data and the N-bit check data A to a memory; (4) reading the K-bit information data from the memory and regenerating a N-bit check data B corresponding to the K-bit information data; (5) performing XOR operation on the check data A and the check data B to obtain a corrector; and (6) locating error in the information data and the check data A by the corrector. If one or two bits of data error occurs, the data error is corrected and correct data is outputted; if two bits or testable more than three bits of data error occurs, the information that non-correctable error occurs is prompted. The method has strong error correction ability, simple operation, and one-bit or two-bit error of memory caused by single event effect is effectively corrected.

The invention discloses a battery management system of an electric vehicle, which comprises a primary vehicle-body system, a main controller and a battery pack, wherein, the battery pack is formed by more than two batter modules connected in series, the batter modules are formed by connecting more than two single cells in series, each battery module is provided with a battery collecting module, the battery pack is respectively connected with a complete vehicle power system through a discharging relay and a charging relay, the main controller is connected with a previous complete vehicle system through a first optical isolator, and the battery collecting module is connected with the main controller through a second optical isolator. The battery management system has the advantages that: as the battery management system is composed of the main controller (BMU) and the next battery collecting module (LECU), the composition of the system structure is simplified through the main controller and the next battery collecting module, the cost of the hardware of the system can be reduced, and simultaneously, the reliability of the management system can be greatly enhanced.

The invention discloses encoding system and method and decoding system and method of a two-dimension code. The encoding system comprises an image generation unit, a position mode generation unit and an encoding unit, wherein the image generation unit sets the partial area of the two-dimension code as an image area without being filled with encoding data, and one or a plurality of images are filled in the image area; the position mode generation unit is used for setting the partial area of the two-dimension code as a position setting area, and data information expressing the position of the two-dimension code is filled in the position setting area; the encoding unit is used for setting the partial area of the two-dimension code as a data area, and the encoding data is filled in the data area. The image or photo can be embedded into the generated two-dimension code; and in addition, the generated two-dimension code is easy to indentify and read and has high error correcting capability and lower requirements for identification equipment.

The invention discloses a method for preventing and distinguishing fake products by using the internet and two-dimension codes. The method comprises the following steps of: 1) randomly setting a set of unique two-dimension codes for each product by a manufacturer; 2) logging on an official database of the manufacturer through the internet to realize butting, wherein each time the two-dimension codes are scanned, a two-dimension code counter automatically accumulates a count; 3) scanning and logging on to verify the two-dimensional codes; and 4) judging whether a product is genuine by displaying the counting numerical value of the two-dimension code counter and the related identity information of a two-dimension code recognizer on the two-dimension code recognizer which scans the two-dimension codes at the same time. The method has the beneficial technical effect that the two-dimension code recognizer is combined with the internet to quickly identify the authenticity of the product on the spot through simple scanning, so that the aims of identifying and cracking down on fake products by the entire population of a country and ensuring that the fake products have no place to hide and disappear from the scene are achieved.

A method for receiving-transmitting ground mobile multimedia broadcast based on free charge DAB includes configuring parameter according multimedia service to carry out source and channel coding and embedding coded service data in master service channel MSC as well as carrying out channel coding to form T-MMB transmission frame being sent out at sending end, synchronizing and decoding received signal and picking up configured parameter as well as carrying out decoding on source and channel at receiving end.

The invention discloses a broadband power line carrier communication physical layer emission signal processing method based on OFDM. The method includes: receiving data from a link layer, and dividing the data into frame control data and load data; performing channel coding on the frame control data and the load data, and modulating the frame control data and the load data after channel coding to subcarriers; performing inverse Fourier transform on the modulated frame control data and the load data, performing power control, and generating a time domain frame control symbol and a time domain load symbol; and adding a cyclic prefix to the time domain frame control symbol and the time domain load symbol, adding a time domain leading symbol, performing windowing processing, and generating physical layer emission signals. According to the method, the utilization rate of the frequency band is high, the transmission rate is high, and the intersymbol interference resistance and the channel fading resistance are excellent.

The invention relates to the wireless network field and discloses a method for rapidly accessing to a wireless local area network and a mobile terminal thereof. By using the method for rapidly accessing to the wireless local area network, the mobile terminal can conveniently access to the wireless local area network. Simultaneously, network privacy information can be protected and network safety stabilization can be strengthened. The method for rapidly accessing to the wireless local area network of the invention comprises the following steps: shooting a barcode photo which stores wireless local area network information, wherein the wireless local area network information comprises a service set identifier (SSID) and a password; analyzing the wireless local area network information from the barcode photo; using the wireless local area network information to access to the wireless local area network.

The invention provides a data verification method in a storage medium, comprising: organizing an ECC data matrix; encoding the data to generate a row check code and a column check code; when performing data operations on the ECC data matrix, using the row check code and column The check code checks the data. The present invention has stronger error correction capability than the single row check, can correct more byte errors, can increase the number of check data, allows more error bits in the storage medium, and can be well Correct these errors. The invention can better support MLC and 4LC type storage media, and achieve the purpose of prolonging the service life of the storage medium, improving the utilization rate of the storage medium and reducing the system cost.

A method for synchronizing video signals with audio signals in decoder system is characterized by that the display time label PTS of currently received audio signals and video signals is compared with the local reference clock LCR obtained from program reference clock PCR, and when the absolute value of their difference is lower than a predefined threshold, the received audio signals and video signals are normally played in synchronous mode. For MPEG-2 stream, the audio signals and video signal can be well synchronized.

The invention discloses a image counterfeit deterrence method based on the chaotic feature, comprising: first, by the chaotic mapping system, using the information needed keep secret and counterfeit deterrence to generate the chaotic sequence which is used to encode the information, then, printing the encoded information to the two-dimension bar code image according to the PDF417 bar code; collecting the two-dimension bar code image by the scanner, and operating the preprocessing of image segmentation, filtration, geometric correction and stratified on collected image, then decoding the bar code according to the decoding rule of national standard PDF417 bar code to attain the chaotic encoded information carried by bar code image. The invention fully utilizes the features of chaotic system and two-dimension bar code technique which are combined for image counterfeit deterrence. The invention has the characters as strong secret-keeping property and large information carried, while it can recognize automatically.

The invention provides a path coverage software test-based automatic test case generation method. The method comprises the following steps of: analyzing a code of a tested program to obtain a controlflow graph (CFG) of the program and a path of the program; obtaining and calculating a fitness function of a group of corresponding test cases according to the control flow graph obtained in the laststep and a branch distance-based method; carrying out iterative updating on a randomly initialized population by using the fitness function through a differential evolution algorithm and a convergencespeed controller; and recording the first test case of paths corresponding to a coverage program until the test cases of all the paths are obtained or the iteration frequency of the algorithm exceedsa limit, and outputting a test case set of the paths corresponding to the coverage program. The method is capable of effectively utilizing the tested program to cover heuristic information of the test cases on the basis of the paths, and can be applied to practical software test work environment.

The present invention relates to the field of digital information transmission technology. The hierarchical block product code (BPC) error correcting, encoding and modulation method includes: coding the input data code stream with different priority level in separate BPC code to obtain BPC stream, mapping the BPC stream based on definition to different bits of planisphere symbol of set modulationmode to obtain hierarchical modulation signal output with different antijamming capability. The present invention has the advantages of simple embodiment, more priority levels, powerful error correcting capacity and high reliability, and may be used in ground digital TV broadcasting system and other fields.

The invention discloses a mobile robot localization method based on a data matrix code, relates to the technical field of mobile robots, and solves the technical problems of reducing localization realization cost and improving localization accuracy. The method is as follows: first a plurality of localization points are set in a mobile robot work area, coordinates of each localization point are compiled into a 2D data matrix code to print into a tag, the localization tag of each localization point is pasted on a ceiling; a mobile robot uses a camera to obtain a localization tag mage on the ceiling, then relative coordinates between the camera and the localization tag can be calculated according to coordinates of the localization tag mage in a camera itself image coordinate system, and by combination of coordinates of the localization point marked by the data matrix code in the localization tag, specific coordinates of a current position point of the mobile robot can be calculated. The mobile robot localization method is suitable for mobile localization for the mobile robots.

The invention discloses a method and a device for forward error correction encoding, a method and a device for forward error correction decoding, and a communication device and system, which belong to the technical field of communication. The encoding method comprises: to-be-transmitted data of the ith row are obtained, wherein the i is an arbitrary value; interleaving processing of the encoded to-be-transmitted data of the (i - 1)th to (i - h)th row is carried out, and interleaved data of the ith row are obtained, wherein the h is no less than 2 and is an integer; the to-be-transmitted data and the interleaved data of the ith row are joined and merged, and to-be-encoded data of the ith row are obtained; BCH encoding is conducted on the to-be-encoded data of the ith row, and encoded data corresponding to the to-be-encoded data of the ith row are obtained; and the encoded data are used to fill an expense portion of the to-be-transmitted data of the ith row, and the encoded to-be-transmitted data of the ith row are obtained and transmitted. The method is good in error correction capability, short in processing time delay and low in implementation cost. The method can satisfy the requirements of data frames in need of high speed transmission.

The invention discloses a Manchester decoding device capable of carrying out error correction and a method thereof. The device comprises a clock frequency divider module, a multipoint sampling module, a jump edge detection module and a decoding module. The clock frequency divider module carries out frequency division processing on a clock signal of an input apparatus and outputs the clock signal after the frequency division processing to the multipoint sampling module. The multipoint sampling module carries out multi-point sampling on a Manchester code element and outputs a sampling result to the decoding module. The jump edge detection module detects a level jump edge of each input Manchester code element and the level jump edge is taken as a reference signal of the multipoint sampling module. The decoding module carries out decoding according to a sampling result of the multipoint sampling module. A traditional Manchester decoding device based on a single point sampling method has the following technical problems that an error correction capability is poor; working is not stable; the device is easy to be interfered and reliability is not high. By using the device and the method of the invention, the above problems are well solved.

The invention provides a retrieval condition error correction prompt processing method based on Pinyin in retrieval application. The method can provide error correction prompts when Chinese character retrieval conditions are input through a Pinyin input method and input errors occur, supports error correction prompts in a Chinese character mode, a Pinyin mode and a Chinese character and Pinyin mixing mode, and provides the error correction prompts according to misused character entry retrieval of homonyms and fuzzy words. According to the retrieval condition error correction prompt processing method based on the Pinyin, a dictionary tree serves as a data structure for query processing, has the advantages of being high in query speed, strong in error correction capacity, little in occupied data space and the like, can improve error correction prompt processing efficiency and response speed of a search engine on retrieval conditions, brings good use experience for users, and therefore improves loyalty of the users to retrieval application products.

The invention relates to a multi-channel flash memory controller, which solves the defect of slow data read-write speed of a flash memory data in the prior art. The controller comprises an IDE interface module, a microprocessor and a flash memory management module which are connected with one another through two-port caches, wherein the flash memory management module comprises a flash memory interface command resolving unit, an inner management unit, a data interface management unit, a channel arbitration unit, a channel cache and a flash memory sequence unit; the data interface management unit, the channel arbitration unit and the flash memory sequence unit are sequentially connected; the data interface management unit and the channel arbitration unit are connected with the flash memory interface command resolving unit through the inner management unit; and a data transmission channel is independent of a command transmission channel. The multi-channel flash memory controller has the advantages of fast flash memory read-write speed, high data read-write reliability, high error correcting capacity, and long flash memory service life.

The invention relates to a constant speed servo unit for controlling angle signals and a control method thereof. A steering vertical column is supported to a flange in a rotation manner, a lower gearbox is fixed to the lower portion of the steering vertical column, a large swiveling gear is mounted on the upper portion of the steering vertical column, a hydraulic steering motor is fixed onto the flange, an output shaft of the hydraulic steering motor is connected with an input shaft of a planetary reducer, a drive pinion is mounted on an output shaft of the planetary reducer, the drive pinion is meshed with the large swiveling gear, the large swiveling gear is further meshed with a reduction gear which is provided with a rotary encoder, the rotary encoder is in communication connection with a rubber angle display and a PLC (programmable logic controller) control unit respectively, the PLC control unit is in control connection with a potentiometer on an operation handle and a proportional valve respectively, and the proportional valve is located in an oil circuit of the hydraulic steering motor. Margin calculation is performed to a rubber angle instruction and rubber angle feedback, a rubber angle feedback signal is subjected to differential transformation of time to calculate steering speed, and the proportional valve is regulated according to difference between a steering speed instruction and actual steering speed.

The invention provides a decoding method for automatically repairing and identifying code pattern symbols of two-dimensional codes. The decoding method includes the following steps that: 1) code pattern symbol images of a two-dimensional code are obtained, and binaryzation is performed on the obtained code pattern symbol images; 2) boundary detection is performed on round unit modules in the code pattern symbol images so as to obtain boundary images; 3) closed boundary tracking is performed on the boundary images; 4) after the closed boundary tracking, identification is performed on the round unit modules, and non circular closed boundaries are discarded; 5) round unit modules in different code pattern symbol images are distinguished and rejected; 6) direction positioning is performed and specifically includes the following steps that: the minimum bounding rectangles of the round unit modules can be obtained through calculation according to the closed boundary coordinates of the round unit modules; a horizontal line and a vertical line which pass through the center coordinates of each minimum bounding rectangle are drawn; and the point of intersection of the horizontal line and the vertical line is adopted as the original point of an image, and each round unit module is divided into an upper left region, an upper right region, a lower left region and a lower right region, and a point in each region, which is farthest to the center of the corresponding minimum bounding rectangle is a positioning round unit module in the corresponding region; and 7) codeword reduction and error correction are performed.