190 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.

It is possible to accurately detect a physical block which has caused a fixture defect in a flash memory so as to limit the use of the physical block. By recording a history of generation of a physical block error and a history of physical erasing in an ECC error record, it is judged whether the error which has occurred is accidental or caused by a fixture defect. When no error is caused in the data written by physical erasing after a first read error occurrence, the first error is accidental and if another error is caused, the error is judged to be caused by a fixture defect. By using such an ECC error record, it is possible to accurately judge whether the error is accidental or caused by a fixture defect. By eliminating use of the physical block judged to have a fixture defect, it is possible to reduce read errors.

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.

In one embodiment of the method of adaptively selecting an airlink coding scheme in a telecommunications network, a coding scheme operating region is determined based on a currently used coding scheme and measurements representative of a block error rate. A block error coding scheme is determined based on the determined coding scheme operating region. In another embodiment of the method of adaptively selecting an airlink coding scheme in a telecommunications network, a first coding scheme is determined based on measurements representative of one or more conditional channel quality metrics, and a second coding scheme is determined based on measurements representative of a block error rate. One of the first and second coding schemes is selected as the coding scheme.

Search engine devices include a content addressable memory (CAM) core having a plurality of CAM array blocks therein and a control circuit that is electrically coupled to the CAM core. The control circuit is configured to support internal error detection and correction operations using modified Hamming code words. These operations are performed without significant impact on the compare bandwidth of the search engine device, even when operations to read entries from the CAM core are performed as foreground operations that may block concurrent search operations. The control circuit may perform the error detection and correction operations by issuing multiple read instructions. These instructions include a first instruction (e.g., error check instruction) to read at least a first entry into the CAM core for the purpose of error detection and then, in response to detecting the first entry as erroneous, issuing a second instruction to read the first entry from the CAM core. The entry is then corrected and written back into the CAM core.

A sending node of a networked system includes an encoding module configured to receive a series of data groups with each data group comprising a data block comprising data bits, and control / status bits including at least one error status bit having a state indicative of a presence or absence of at least one type of data block error. The sending node is configured to generate for at least one of the data groups of the series an expected cyclic redundancy code (CRC) comprising a plurality of bits that is a function of the data block and control / status bits, not including the at least one error status bit. The sending node is further configured to encode the expected CRC with the state of the at least one error status bit to thereby generate for the at least one data group an encoded CRC comprising a plurality of bits.

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 method comprising: a step for partitioning (1) 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 (3, 4), 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 (10) 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 (1) 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 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.

A method decodes a soft-input cost function for an [N,k]q linear block error- correcting code that has a fast sparse transform factor graph (FSTFG) representation, such as Reed-Solomon codes. First, the code is selected and its FSTFG representation is constructed. The representation is simplified and is made redundant if the improved performance is more important than the increased decoding complexity. An encoding method consistent with the representation is selected. A set of message-update and belief-update rules are selected. The messages are initialized according to a soft-input cost function. An iterative decoding cycle is then begun, in which the first step consists of updating the messages according to the pre-selected message-update rules. In the second step of the decoding cycle, a trial code word is determined from the messages, the pre- selected message-update rules, and the encoding method. In the third step of the decoding cycle, the tentative output code word of the decoding method is replaced with the trial code word if the trial code word has lower cost. Finally, the decoding cycle terminates if a termination condition is true, and outputs the tentative code word, and otherwise repeats the decoding cycle. The decoding method can be combined or concatenated with other decoding methods for FSTFG codes.

Image block error concealing apparatus and methods in a mobile communication system can improve a picture quality. When a pixel / block has an error, a motion vector is generated by fast-motion-estimating a preceding frame and a subsequent frame, and the error-generated pixel / block can be restored using the motion-compensated pixel / block. Filtering can be performed by selecting first or second filters (e.g., an adaptive weight sum and an average sum) according to a difference value between the restored pixel / block and an average value of adjacent pixels / blocks, to refine the restored pixel / block.

The invention relates to a long term evolution (LTE) downlink control information channel resource allocation method and a base station. The method includes that the base station issues resource scheduling information to a physical layer through a media access control (MAC) layer, a search space which resources to be allocated belong to is judged according to the scheduling information, and resource allocation of a current downlink information channel is performed according to the quality level of the current downlink information channel when the resources to be allocated belong to a user equipment (UE) special search space. The LTE downlink control information channel resource allocation method and the base station can dynamically and reasonably allocate physical downlink control channel (PDCCH) resources according to the quality of downlink information channels, and can further obtain the quality level of the downlink information channels through channel quality indication (CQI) fed back by the UE or block error ratio (BLER) of a hybrid auto repeat request (HARQ) or measurement results of uplink information channels. Therefore, reasonable use ratio of downlink resources is improved, resources occupied by control information channels are reduced, more information channel resources can be reserved to be used for business transmission, or more users can be scheduled on the basis of resources occupied by the control information channels, and accordingly performance of the integral system is improved and capacity of the system is increased.

A radio communication device includes: a directivity control unit that configures each of directivities of a plurality of antennas; a directivity switching unit that switches between the directivities of the antennas; a reception quality estimation unit that measures a reception quality of a received signal received by the antennas; and a block error estimation unit that estimates a block error in reception data which is obtained by decoding the received signal. In the case where a block error occurs continuously for a predetermined number of times or longer and an amount of decrease in the reception quality is lower than a predetermined value, the directivity control unit re-adjusts a directivity to decrease the block error, based on a result of the estimation of the block error and a result of the measurement of the reception quality, the re-adjusted directivity being one of the directivities of the antennas.

An outer-loop power control method and a communication apparatus having an outer-loop power control function for increasing target SIR if an error is detected in a block-error observation interval and decreasing target SIR if not a single error is detected in the block-error observation interval. At least one of the block-error observation interval, an incrementing step for when target SIR is increased and a decrementing step for when target SIR is decreased is varied based upon the number of erroneous blocks among error-detecting blocks contained in a transmission time interval TTI.

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.

The invention discloses an adaptive modulation and coding method and an adaptive modulation and coding device. The adaptive modulation and coding method comprises the following steps of: firstly, under the condition that the reported CQI (Channel Quality Indicator) appears for the first time, recording the reported CQI, initializing parameters of the reported CQI, executing the second step and directly executing the second step under the condition that the reported CQI does not appear for the first time; secondly, updating the block error ratio of the CQI corresponding to ACK (Acknowledgement) / NACK (Negative Acknowledgement) according to the reported ACK / NACK and updating a modulation coding mode correction value and a status marker bit of the CQI corresponding to the ACK / NACK when the status marker bit of the CQI corresponding to the ACK / NACK is positioned in an instable state; and thirdly, under the condition that the status marker bit of the reported CQI is instable, acquiring a final MCS (Modulation and Coding Scheme) according to the reported CQI and the modulation coding mode correction value of the reported CQI; and under the condition that the status marker bit of the reported CQI is stable, determining the final MCS according to the reported CQI and the corresponding block error ratio of the reported CQI.

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.

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.

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 provides a method and a device for upstream resource allocation. The method comprises the following steps of: determining a terminal is in a power limited state by a base station, wherein the power limited state means that an expected transmitting power of the terminal is beyond a maximum transmitting power of the terminal, and the condition of a scheduled BLER (Block Error Ratio) is met by the expected transmitting power; determining a SingleRB_SINR (Single Resource Block_Signal Interference Noise Ratio) by the base station by using an SINR and a PHR (Power Headroom Report) reported by the terminal; and determining the upstream resource allocation by the base station by using the SingleRB_SINR. According to the method and the device for the upstream resource allocation, provided by the invention, the utilization rate of an upstream resource is increased.

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.