186 results about "Block error" patented technology

Apparatus and methods store error recovery data in different dimensions of a memory array. For example, in one dimension, block error correction codes (ECC) are used, and in another dimension, supplemental error correction codes, such as convolutional codes, are used. By using separate dimensions, the likelihood that a defect affects both error recovery techniques is lessened, thereby increasing the probability that error recovery can be performed successfully. In one example, block error correction codes are used for data stored along rows, and this data is stored in one level of multiple-level cells of the array. Supplemental error correction codes are used for data stored along columns, such as along the cells of a string, and the supplemental error correction codes are stored in a different level than the error correction codes.

A system and method for efficiently correcting block errors in packet-based digital communications are provided whereby the ratio of redundant symbols/message symbols over the length of a data packet decreases in order to more efficiently use available bandwidth. The reduction of this ratio, and subsequently the change in a corresponding framing schedule, may be determined through negotiations between the transmitting device and the receiving devices. Each receiving device calculates a redundancy requirement based on signal-to-noise ratio samples. This requirement is returned to the transmitting device in the form of a schedule request. The transmitting device determines if a new framing schedule is needed based on the schedule request, and communicates this new framing schedule to the receiving device. Once the receiving device acknowledges receipt of the new schedule, the transmitting device switches to the new framing schedule for future data packet transmissions.

A memory system comprising a qubit array configured to store therein and read one or more entangled qubit states encoded using a quantum stabilizer code. The quantum-memory system further comprises a quantum-state-refresh module configured to change an entangled qubit state in the qubit array when an error is detected therein. The quantum-state-refresh module is configured to detect an error by performing a redundant measurement of a set of syndrome values corresponding to the quantum stabilizer code, with the redundant measurement being based on a block error-correction code. In one embodiment, the block error-correction code is a low-density generator-matrix code or a low-density parity-check code constructed using an EXIT-function optimization method.

Systems, apparatus, and methods are provided to enhance transmitting and receiving video data streams with feedback information over a lossy and/or congested network. The systems, apparatus, and methods may optimize retransmission for lost packets or lost data frames. Optimizations are also provided to select reference frames in a data stream so that block errors are contained when RPS is used to encode data frames. Optimization in decoding may include reconstructing high-resolution data frames from low-resolution data frames.

A quantum-state-refresh module of a memory system is configured to detect an error in an entangled qubit state stored therein by performing a redundant measurement of syndrome values corresponding to a quantum stabilizer code, with the redundant measurement being based on a block error-correction code. The quantum-state-refresh module includes a plurality of measurement sub-modules, each configured to measure a respective syndrome value or a respective parity value corresponding to the entangled qubit state. The total number of the measurement sub-modules is smaller than the codeword length of the block error-correction code, and the initial approximation of the punctured syndrome values is replaced in the decoding process by erasure values. With the block error-correction code appropriately constructed for the use of erasure values, the quantum-state-refresh module is advantageously capable of providing reliable error detection with fewer quantum gates than that used for the full-length measurement of the codeword.

A wireless apparatus 1 receives reception quality information, propagation environment information, and block error rate detection information from a wireless apparatus of the other end of communication together with a data signal, and the target error rate selecting unit 7 selects any one of a plurality of tables in which target block error rates of respective ones of a plurality of transmission modes are registered in accordance with propagation environment information. The threshold value control unit 8 controls the threshold value of the reception quality to select the transmission mode by the control amount on the basis of the target block error rate in accordance with error rate detection information. The transmission mode selecting unit 9 compares reception quality information with the threshold value, selects any one of the transmission modes, and makes the selected one into the transmission mode to the wireless apparatus of the other end of communication.

The invention discloses a method for adjusting block error ratio. The method is used for realizing the adjustment on initial error block ratio, and further improves the veracity of the adjustment in a modulation coding mode. The method comprises the following steps of determining the QoS (Quality of Service) index of the current service of the user; judging whether the target initial block error rate (BLER) needs to be adjusted or not according to the determined QoS index; if so, carrying out the adjustment; and if not, keeping the current target initial BLER unchanged. The invention also discloses a device for implementing the method.

The invention relates to a self-adaption adjusting method and a self-adaption adjusting device of a PDCCH (physical downlink control channel). The device comprises the following steps: automatically adjusting the CFI (control format indicator) of the PDCCH according to the subscriber number UEnum and the presupposed CFI threshold value; scheduling the user needing scheduling in respective scheduling windows; automatically adjusting the current PDCCH transmitting power Po and the current CCE (control channel element) polymerization degree according to the BLER (block error ratio) of the PDCCH of the current scheduling user as well as the adjusting strategy of the presupposed power offset and the CCE polymerization degree; and the device comprises a CFI adjusting module, an initialization module, a scheduler module and a self-adaption adjusting module. According to the self-adaption adjusting method and the device of the PDCCH, the whole performance of an LTE (long-term evolution) system is optimized.

A technique for recovering of “squeezed” sectors in a set of sequential sectors such as are used in Shingled Magnetic Recording (SMR) is described. Embodiments of the invention use a programmable erased sector recovery scheme, which is a concatenation of a “Cauchy-type” track erasure correction code, together with a media-error correction code that generates N-weighted parity-sectors per track and is capable of replacing up to N-erased sectors per track in any possible combination.

An embodiment of the invention provides an adaptive modulation and coding method for a wireless communication system, which includes the steps: acquiring current signal-to-noise ratio and block error ratio of signal channel transmission; judging whether the block error ratio is larger than a first preset threshold value or not, if not, the block error ratio offset is increased, and the increasing quantity is a product of a preset step length and an up-regulated factor, and if yes, judging whether the block error ratio is larger than a second preset threshold value or not, and if the block error ratio is larger than the second preset threshold value, the signal-to-noise ratio offset is decreased, and the decreasing quantity is a product of the preset step length and a down-regulated factor; selecting a modulation and coding grade from a preset modulation and coding table according to a sum of the current signal-to-noise ratio and the signal-to-noise ratio offset; and performing modulation and coding according to selected modulation and coding grades corresponding to modulation and coding formats. By the aid of the embodiment of the adaptive modulation and coding method, the possible problems of adaptive modulation only depending on CQI (channel quality indicator) are avoided, and data transmission efficiency of an adaptive system is improved.

The method comprising: a step for partitioning the image into regions, a region being made up of a set of consecutive or non-consecutive blocks, according to the television scanning order of the image, an inter- or intra-block coding step, the blocks being coded by region according to an ordering of the regions, and, for a region, according to the order of succession of the blocks that make up the region, a coded block error correction step, is characterized in that, a step for analysing the field of movement is carried out to calculate a “lifespan” parameter assigned to a block and corresponding to its probability of existence in subsequent images, according to the movement vector associated with this block, the partitioning step is performed taking into account the value of this parameter to define and order the regions of the image from most important to least important, the error correction step uses a more effective error correction algorithm for the coded data corresponding to the first regions than for the data corresponding to the latter regions.

The present invention is designed to provide a radio communication system, a user terminal and a radio communication method that make it possible to monitor communication quality adequately even when a new radio resource structure is employed. A radio communication system is provided, which transmits downlink control information from a radio base station to a user terminal by using an enhanced downlink control channel that is frequency-division-multiplexed with a downlink shared data channel, and which also monitors downlink quality based on the received quality of downlink reference signals that are transmitted from the radio base station to the user terminal, and, in this radio communication system, the user terminal determines radio link failures by comparing the received quality of the downlink reference signals transmitted from the radio base station, against one or both of first criteria, which are constituted of two thresholds that correspond to predetermined block error rates of a downlink control channel, and second criteria, which are constituted of two thresholds that are different from the two thresholds of the first criteria.

The invention concerns an adaptive link adaptation method and system for a packet data enabled mobile telecommunication network. Data packets are transferred over one or more radio links, each packet is coded using a given coding scheme. Statistical data including channel quality estimates, information about successfully or unsuccessfully received data packets, and information about the used coding schemes are accumulated. Block error rates for one or more coding schemes are determined based on the accumulated statistical data, each block error rate including a function of coding scheme and channel quality estimate. A coding scheme with the best performance for a current data packet to be transmitted over a given radio link with current channel quality is selected based on the determined block error rates.

The invention is used for solving the issue that is the currently-used technology can't control the block-missing rate so as to cause low throughout. It comprises: setting up a corresponding table between the initial adjustment value and the block-missing rate, and calculating the block-missing rate at unit time and at a certain times; if the block-missing rate is more than an upper threshold and less than a threshold, then according to the block-missing rate, the code rate is adjusted. By setting up a frequency counter and a timer, the invention ensures the accuracy and real-time statistic of block-missing rate. The invention is mainly used in high speed downlink packet access (HSDPA) system.

The invention discloses a halftone watermarking method based on pixel block odd-even check and pixel block error dispersion. The halftone watermarking method includes steps: (1) image color separating; (2) watermark image preprocessing; (3) pixel block odd-even check value calculating; (4) watermark embedding strength determining; (5) watermark embedding; (6) image correction and (7) watermark drawing. The halftone watermarking method solves the problems in the prior art that scanned images to be detected are required to be subjected to binaryzation during watermark drawing and watermarks are poor in robustness and cannot really resist printing scanning attack. The halftone watermarking method has the advantages of being good in robustness, capable of effectively resisting printing scanning, random altering and tailoring and other attack and capable of drawing watermarks easily.