77 results about "Burst error" patented technology

A receiver for providing a corrected output symbol sequence is disclosed. A decision feedback equalizer (DFE) generates an output sequence of DFE decision symbols; a second feed forward equalizer (FFE) generates a second equalized output symbol sequence; and correction logic, responsive to determination of an end of burst error position of a burst error sequence in the DFE output sequence, determines a candidate earliest start of burst position, and determines the corrected output symbol sequence by comparing the second equalized output symbol sequence with candidate symbol sequences that correspond to corrections of DFE decision output symbols in the burst error sequence.

Technologies for storing burst error information in a buffer structure and signaling to prevent overflow and over-writing the buffer structure are described. One controller device includes error detection logic, a buffer, and buffer control logic. The error detection logic detects an error in a read operation associated with a memory device coupled to the controller device. The buffer stores error information associated with the error. The buffer control logic generates and outputs a first signal responsive to the buffer being full.

The embodiment of the invention discloses a data mapping method and a related device, which can obtain higher coding gain while keeping good compatibility, and can ensure the resistance to channel burst errors at the same time. Specifically, a first data stream encoded by an outer code is obtained. Afterwards, the first data stream is subjected to inner code coding to obtain a second data stream, the second data stream comprises L code words subjected to second FEC coding, L is an integral multiple of 8, each code word comprises n bits, and n is an odd number larger than 1. Furthermore, the L code words are interleaved and mapped to obtain n * L / 8 DP-16QAM symbols, any one of an X polarization direction I-path component, an X polarization direction Q-path component, a Y polarization direction I-path component and a Y polarization direction Q-path component of each DP-16QAM symbol is obtained by mapping two bits in the L code words, and each DP-16QAM symbol is obtained by mapping eight bits from eight code words.

The invention discloses a UWB-IMU-ODOM sequential fusion positioning algorithm based on AUKF, a storage medium and equipment, and relates to the technical field of indoor positioning, and the algorithm comprises the steps: completing the preliminary calculation of UWB data and a track plotting result in respective time steps; performing state prediction by a central UKF (Unscented Kalman Filter) based on a CTRV motion model, and eliminating abnormal measurement values by comparing a residual range with a chi-square distribution value so as to reduce the influence of noise peaks and burst errors on the positioning precision; through an adaptive noise adjustment mechanism, a sliding window is adopted to calculate the moving average of the residual error, and the noise covariance is dynamically adjusted according to the residual error change amplitude to adapt to the change of noise characteristics in a complex dynamic environment. A centralized sequential fusion framework is adopted, independence of UWB and IMU / ODOM data is reserved, sensor data at different moments are fused through a central UKF filter, and the method has low calculation complexity and good robustness and is suitable for an embedded system with limited resources.

A detection method includes: obtaining a decision feedback equalizer coefficient, where the decision feedback equalizer coefficient includes a tap coefficient; obtaining a decision signal sequence of a decision feedback equalizer; determining a first location of a decision signal of a start of burst error in the decision signal sequence when the tap coefficient is less than or equal to a first preset threshold; and determining a second location of a decision signal of an end of burst error in the decision signal sequence based on the first location.

The present application provides a data transmission method, a device, and a system. In the solution provided by the present application, on the basis of symbol groups, a sending end multiplexes a data streams to obtain b data streams, wherein a is an integer greater than or equal to 2, b is an integer greater than or equal to 1, b<a, any one of the b data streams comprises a plurality of symbol groups, any one of the symbol groups comprises a plurality of symbols from different codewords, and any one of the symbols comprises a plurality of bits; and the sending end transmits the b data streams. In the solution provided by the present application, a sending end performs multiplexing on the basis of symbol groups each comprising symbols, and even if a burst error of a plurality of consecutive bits occurs in the transmission process, when a receiving end performs demultiplexing on the basis of the symbol groups, the number of symbols affected by a burst error of the plurality of consecutive bits of the data streams multiplexed on the basis of the symbol groups is far smaller than the number of symbols affected by the burst error of the plurality of consecutive bits of the data streams multiplexed on the basis of bits, so that the error correction performance and the reliability of the system are improved.

The application discloses a computing system configured to measure a step response of a channel in an electronic device, determine a feedback voltage added to the channel by a decision feedback equalizer in response to detecting inter-symbol interference in a received symbol, and predict signal integrity of the channel based at least in part on the step response of the channel and the feedback voltage. The computing system may utilize the predicted signal integrity to determine a probability that a feedback voltage added to the channel by the decision feedback equalizer is wrong, and determine a signal integrity of the channel based at least in part on the step response of the channel, the feedback voltage, and a probability that the feedback voltage added to the channel by the decision feedback equalizer is wrong.

This application provides a location detection method and a related apparatus, and relates to the field of communication technologies. The method includes: obtaining a decision feedback equalizer coefficient, where the decision feedback equalizer coefficient includes a tap coefficient; obtaining a decision signal sequence of a decision feedback equalizer; determining a first location of a decision signal of a start of burst error in the decision signal sequence when the tap coefficient is less than or equal to a first preset threshold; and determining a second location of a decision signal of an end of burst error in the decision signal sequence based on the first location. In this application, the corresponding location detection method is determined based on a relationship between the tap coefficient and a preset threshold, and a location of a decision signal corresponding to a burst error in the decision signal sequence is accurately determined according to the location detection method, to help eliminate the burst error in the decision signal sequence.

The application relates to the technical field of memory data error correction, and provides a layered error correction method and system for DDR5 memory and a medium, which comprises the following steps: configuring initial resource weights for three layered levels of single-bit error correction, double-adjacent error correction and triple-discrete error detection; after reading memory data and corresponding ECC error correction check bits, determining an error category through comparison operation, and dynamically adjusting resource proportions of each level in combination with parameters such as a real-time running frequency of the memory; then, corresponding error correction is completed or triple-discrete error alarm is triggered according to the error type, and the process is continuously cycled. The application can support mixed processing of multiple error types, dynamically allocate resources in an adaptive high-frequency working state, improve the detection and response capability for burst errors, and improve the error detection and correction efficiency.

The memory includes a link training circuit having a pseudo-random bit sequence (PRBS) generator and a burst error detection counter including a comparator, a first input coupled to the data input, a second input coupled to the PRBS generator, and a counter operable to increment an error count value by one in response to detecting any number of errors greater than zero in a sequence of symbols including a predetermined number of symbols.

Embodiments herein describe re-ordering bit-interleaved data to be byte-interleaved data before transmitting the data on an OTN. For example, a transmitter can receive interleaved bits for different symbols that are part of an error correction code to be transmitted in an optical transport network. The transmitter re-orders the interleaved bits into interleaved bytes where each of the interleaved bytes correspond to one of the different symbols. The interleaved bytes can then be transmitted on the OTN.

A method for improving the forward error correction in serial coding in a data transmission in a vehicle allowing the physical behavior on a transmission channel to always be deterministically controlled despite a reduction in the resource requirements. Tit errors are minimal and a transmission error can be corrected efficiently. In addition, encoders used are designed with a minimum number of gates and an interleaving is implicit in the proposed method, which is based on the fact that burst errors can be corrected particularly advantageously. This interleaving makes it possible to dispense with conventional buffer memory required for explicit interleaving. In addition, user data together with correcting metadata can be encoded advantageously. It can be ensured that not only the user data is line-coded or line-encoded, but also the correction data. Also provided is a system for implementing the method.

The invention discloses a method and an apparatus in a node for wireless communication. A node receives a first information block, the first information block indicating a first sub-band, the first sub-band comprising at least one resource block that can be used for uplink transmission in a downlink symbol; receiving a first signal in a second sub-band, the second sub-band comprising a plurality of resource blocks, the first signal being allocated with a plurality of virtual resource blocks; any one of the plurality of virtual resource blocks belongs to a target virtual resource block set, and the virtual resource blocks included in the target virtual resource block set are divided into a plurality of virtual binding; the plurality of virtual binding are respectively mapped to a plurality of physical binding, and any one of the plurality of physical binding comprises at least one physical resource block; the target virtual resource block set depends on a frequency domain relative position relationship between the first sub-band and the second sub-band. According to the invention, the ability to resist burst errors is improved.

The present invention belongs to the field of free-space laser communication, and in particular, is a relay laser communication coding method for FSO systems, comprising the following steps: Step 1, obtaining a sequence to be coded at a source node, and polarization coding of K=k+m codewords as information bits; Step 2, using an interleaver to change the information position to the maximum extent and resist long-segment errors; Step 3, sending the codeword sequence at the source node to the destination node and the relay node via BPSK modulation. The present invention integrates cooperative communication with channel coding technology to achieve efficient cooperative transmission of Polar codes in a cooperative relay system to achieve the capacity of the relay system. A single link cannot resist channel interference well, and cooperative technology can effectively combat fading, thereby improving the ability of the relay system to resist continuous burst errors, and combining channel coding and cooperative diversity technology to achieve the capacity of the relay system.

The present invention relates to a method for generating a bit sequence that can be transmitted efficiently and has a limited disparity and a limited run length. The proposed method allows data to be able to be transmitted particularly efficiently on a transmission channel. Compared to the prior art, the invention offers, among other things, the advantage that the physical behaviour on a transmission channel can always be deterministically controlled despite a reduction in resource requirements. Thus, according to the proposed method, bit errors are minimal and a transmission error can be corrected efficiently, i.e. with minimal technical effort. Furthermore, the encoders used are designed with a minimal number of gates, and the proposed method implicitly includes an form of nesting that allows so-called burst errors to be corrected particularly advantageously.

The invention relates to a method for generating an efficiently transmittable bit sequence with a limited degree of discrepancy and a limited run length. The proposed method allows a particularly efficient transmission of data over a transmission channel. Compared with the prior art, one of the advantages of the invention is that the physical behavior on the transmission channel can be certainly controlled all the time although the resource demand is reduced. Thus, according to the proposed method, bit errors are few, and transmit errors can be corrected efficiently (i.e., with little technical effort). Furthermore, the encoder used is designed to have a minimum number of gates, and interlacing is implied in the proposed method, which ensures that so-called burst errors can be particularly advantageously corrected.

The invention discloses a method for improving voice quality of a receiving end of a voice communication system, and relates to the technical field of voice communication. According to the invention, in the aspect of protocol design, a mode of combining frame synchronization with RS coding is adopted, so that the influence of unstable factors such as disorder, packet loss and burst error codes introduced on a transmission path on voice can be reduced, and the integrity and continuity of voice frames are ensured; a coding post-processing module is designed at a sending end, a frame synchronization head and an RS code can be added to a voice frame, a UDP voice packet processing module and a decoding driving module are designed at a receiving end, and a UDP voice packet is fully preprocessed before being sent to a decoding chip; the processing method comprises the steps of caching, sorting, UDP voice packet number moving average in a cache pool, rate adjustment state circulation, a rate dynamic adjustment mechanism, frame synchronization, RS decoding and the like, the problems of delay, packet interval jitter and the like can be effectively relieved after preprocessing, the overall balance and stability of the voice code rate are guaranteed, and the voice quality of a receiving end is improved.

The application provides a search method and device for secondary permutation polynomial interleaving parameters, and belongs to the technical field of communication. The method comprises the following steps: receiving the data block length N of a communication system as an interleaving length; reducing redundancy candidates by equivalent class parameter compression; generating two candidate sets of parameters; performing permutation combination on the two candidate sets to obtain all parameter candidate pairs, and sequentially performing algebraic metric preliminary screening and S distance fine screening on the candidate parameter pairs to output high-performance interleaving parameters; and configuring the screened optimal QPP interleaving parameters into a Turbo code interleaver of the communication system to perform interleaving processing on actual signals. The application can be used in various communication systems, solves the problems of low search efficiency, large candidate set scale and insufficient local burst error suppression capability of existing QPP interleaving parameters, and effectively reduces the complexity of parameter search and simulation workload.

The application discloses a data interleaving method and device, and relates to the field of optical fiber communication systems.The method comprises the following steps: dividing an input bit data stream into a plurality of first data blocks by taking 4 bits as a unit, exchanging 2 bits of data in the middle of each first data block; dividing the exchanged bit data stream into second data blocks by taking 512 bits as a unit, and performing intra-block interleaving; and performing inter-block interleaving on the bit data stream after the intra-block interleaving through two random access memories.The application guarantees the original probability distribution characteristics of the PCS technology, and improves the ability of correcting burst errors in the joint application of the FEC technology and the PCS technology.

Techniques are described herein for intelligent shedding of inroutes determined to have high burst error rates. Embodiments operate in context of a multi-spot beam satellite communication system that uses time-division multiple access (TDMA) communication protocols and inroute groups. Burst error rates of inroutes can be monitored over time to identify bad inroutes. Each bad inroute can be shut down and quarantined. After a predetermined amount of time, one or more selected terminals can be redistributed to the bad inroutes, and the burst error rates of those inroutes can be monitored again to determine whether those inroutes should remain quarantined. If an inroute is no longer bad, it can be removed from quarantine and returned to an inroute group list. If the inroute is still bad, it can be periodically re-checked until it ultimately improves, is permanently quarantined, etc.

Technologies for storing burst error information in a buffer structure and signaling to prevent overflow and over-writing the buffer structure are described. One controller device includes error detection logic, a buffer, and buffer control logic. The error detection logic detects an error in a read operation associated with a memory device coupled to the controller device. The buffer stores error information associated with the error. The buffer control logic generates and outputs a first signal responsive to the buffer being full.

Provided are a communication device, a communication controlling method, and a non-transitory computer-readable medium storing a communication controlling program that each make it possible to grasp the condition of communication quality. A communication device (1) includes acquiring means (2) configured to acquire quality information concerning a burst error that has occurred in an optical communication line. The communication device (1) includes estimating means (3) configured to estimate a first index value based on the quality information acquired by the acquiring means (2), the first index value indicating a degree of influence of the burst error on communication quality in a first communication device.

The invention provides an error propagation suppression method for a differential decoder based on error endpoint positioning, and the digital signal processing of a receiving end comprises the steps: recovering a part of response signals through employing the differential decoder, and detecting an input signal of a fourth-order pulse amplitude modulation PAM4 decision device in the differential decoder through employing a threshold detector, when the input signal of the PAM4 decision device is greater than a preset threshold value, judging that the current sampling point is the end point of the burst error, recording the polarity of the error and activating the error correction step; forward backtracking is carried out from the end point of the burst error, and judgment noise of the first L symbols is calculated; marking the symbol with the maximum noise as a starting point of error propagation; and finally, symbols in a range from an error propagation starting point to an error propagation ending point are corrected so as to suppress burst errors caused by a differential decoder. According to the invention, error propagation introduced by the differential decoder can be effectively suppressed, the sensitivity of the receiver is remarkably improved, and the transmission performance of the system is improved.

The present invention relates to a method for generating an efficiently transmittable bit sequence with limited disparity and limited run-length. The proposed method enables data to be transmitted particularly efficiently over a transmission channel. One of the advantages of the present invention over the prior art is that the physical behavior on the transmission channel can always be controlled deterministically while reducing resource requirements. Thus, according to the proposed method, bit errors are minimized, and transmission errors can be corrected efficiently, i.e., with minimal technical effort. Furthermore, the encoder used is designed with a minimum number of gates, and interleaving is implicitly present in the proposed method, which ensures that so-called burst errors can be corrected particularly favorably.

According to the coding method and device for communication while drilling, the coding method and device for communication while drilling and the decoding method and device for communication while drilling and the terminal, a data bit vector to be sent to the ground is coded based on an error correction code coding rule, and the error resistance of the vector is improved; an information structure is changed by utilizing an interleaving rule, so that the randomness of data is improved, burst errors possibly occurring in transmission are dispersed, and the anti-interference capability of data transmission is improved; and performing combined code coding on the obtained second error correction code codeword vector, thereby realizing combined coding of error correction code coding, interleaving and combined code association, enhancing constraints between coding bits, improving the error resistance of the pulse sequence vector generated based on the combined code, establishing a pulse communication link considering both energy efficiency and error resistance, and improving the communication efficiency of the pulse communication link. A basis is provided for reliable transmission of data in a mud pulse communication channel, and a technical support is provided for realizing reliable well-ground uploading communication.

The present disclosure relates to systems and methods for FGPA-based burst-error performance and optimization of regular and irregular SD-LDPC codes for 50G-PON / 100G-PON and beyond. In particular, the burst-error performance of the regular low-density parity-check (LDPC) code is evaluated and the irregular LDPC code that has been considered for ITU-T's 50G-PON standard via experimental measurements in FPGA. By using intra codeword interleaving and parity-check matrix rearrangement, it is demonstrated that the BER performance can be improved under ˜44-ns-duration burst errors for 50 Gb / s / 100 Gb / s upstream signals.

Disclosed in the embodiments of the present application are a data transmission method, apparatus and system. Specifically, a data frame transmitted by a transmitter comprises NSF subframes in one polarization direction, NSF being an integer greater than 1, wherein each of the NSF subframes comprises a training symbol and a pilot symbol, and at least two of the NSF subframes each comprise a reserved symbol. In this way, reserved symbols are distributed in a relatively dispersed manner in any polarization direction of a data frame; thus, regardless of what function the reserved symbols are used to implement, the reserved symbols have relatively high resistance to burst errors and relatively good transmission reliability, and can be well applied to various future coherent transmission scenarios.

The invention discloses an alignment mark searching method, device and system and a computer readable storage medium, and relates to the technical field of communication. The method comprises: a first module receiving a first data stream, the first data stream being obtained by multiplexing a plurality of second data streams according to a reference granularity, any second data stream comprising AM and data from at least one FEC codeword, the reference granularity being a bit number corresponding to n symbols included in the FEC codeword; and obtaining the first data segment from the first position of the first data stream according to the reference granularity, and performing AM search on the first data segment. According to the method, the reference granularity is the number of bits corresponding to the n symbols, so that the number of symbols influenced by burst error codes is small when the burst error codes occur in the first data stream. Compared with a data stream obtained by bit multiplexing, the first data stream in the method has higher tolerance to burst error codes.

The invention relates to the technical field of telecommunication, in particular to a method for realizing error correction of an optical transport network based on a parallel coding and decoding technology, which remarkably improves the processing efficiency of data coding and decoding by adopting a combined parallel working mode of eight single-path encoders and a combined parallel working mode of eight single-path decoders. The data is protected by using RS coding, the anti-interference capability and reliability of the data are further enhanced through an interleaving technology, the integrity of the data in the transmission process is ensured, and the performance of the whole OTN system is improved through a parallel coding and interleaving technology. The method can better adapt to the requirement of high-speed data transmission, and solves the problem that the RS code cannot be corrected due to the fact that some code words contain too many errors when burst errors periodically occur.