47 results about "Forward error correction" patented technology

In one aspect, a method includes receiving, in a first wireless device, a data transmission including at least one orthogonal frequency division multiplexing (OFDM) packet from a second wireless device; processing the at least one OFDM packet to recover data and providing the data to a host processor of the first wireless device; encoding, in the first wireless device, at least one decoded symbol of the at least one OFDM packet using forward error correction coding; processing the encoded at least one decoded symbol to recover at least one corresponding transmission symbol of the at least one OFDM packet; and determining a distance estimate between the first wireless device and the second wireless device based at least in part on the corresponding transmitted symbols.

The application relates to a power grid special communication protocol transmission method, system and device based on FPGA. The method mainly comprises the following steps: packaging data to be transmitted into frame structure data; performing forward error correction coding on the frame structure data at a sending end to form extended frame structure data; transmitting the extended frame structure data to a receiving end through a communication link; performing forward error correction decoding on the received frame structure data at the receiving end to obtain decoded frame structure data; performing frame disassembling processing on the decoded frame structure data to extract valid data; and checking the valid data, and completing data receiving when the checking is passed. The application can solve the protocol jamming problem caused by asymmetric bandwidth, and improve the reliability and efficiency of data transmission of a power optical fiber communication system.

The application discloses a UAV long-distance aerial photography data encryption transmission method, and relates to the cross technical field of information security and UAV remote sensing communication. In the process of UAV flight, the original aerial photography image data collected is pretreated and dynamically blocked by the airborne processing unit, and each data block is allocated a unique identification sequence; a session key is generated in real time in combination with wireless channel state information, UAV flight attitude parameters and ground station relative position information; different intensity encryption processing is respectively performed according to the sensitivity of the data block; after the encrypted data block is subjected to priority scheduling, forward error correction coding and adaptive modulation coding, it is sent to the ground receiving end; after the ground receiving end completes integrity check, a selective retransmission request is initiated, and the airborne processing unit only re-executes the encryption and transmission process for the specified data block; after all the data blocks are received, the ground receiving end recombines according to the unique identification sequence, and decrypts and restores by using the session key, and outputs complete aerial photography image data.

The application relates to the technical field of data acquisition and state processing of embedded optical communication equipment, and particularly relates to an embedded optical module data acquisition and processing system. The system generates an original state sequence through a link sampling module, obtains a synchronous state sequence, forward error correction residual consumption and forward error correction deviation through a state feature construction module, adjusts sampling and generates a fusion weight set and a normal confidence suppression coefficient through an adaptive control module, and finally obtains optical module state data processing results through a collaborative discrimination module. The application forms an original state sequence by collecting optical power state quantities, forward error correction code state quantities and forward error correction load state quantities, and obtains a synchronous state sequence through preprocessing. The original state sequence is combined with the forward error correction residual consumption and the forward error correction deviation to adaptively control sampling and collaboratively discriminate, so that the optical module state processing accuracy is improved.

The present specification provides a method, network architecture and network device for reducing the error rate of Ethernet, the method comprising: setting a FlexE shim layer between an Ethernet media access control (MAC) layer and a physical (PHY) layer, performing first forward error correction (FEC) calculation on encoded traffic through interleaving multiplexing using the 5G slot of the FlexE shim layer to obtain first traffic after error correction, and performing second FEC calculation on the first traffic using the PHY layer to obtain second traffic after error correction. Through the method, the error rate of Ethernet can be reduced.

The application discloses a kind of high-frequency test data's adaptive compression and lossless fast transmission method and system.The method includes: real-time extraction of high-frequency test data multidimensional dynamic feature vector and mark feature point;Based on feature, network bandwidth and target compression ratio, through pre-training decision model dynamic selection compression algorithm combination and parameter;According to algorithm combination, data is framed and type is preprocessed;With multistage pipeline execution compression, and interstage insertion based on statistical characteristics correction link;Three-dimensional transmission state matrix is constructed, which fuses priority, link and quality score, dynamically allocates link and adaptively adds forward error correction code;After error correction decompression at receiving end, lossless verification is realized by multidimensional comparison of the feature point sequence of reconstructed data and original data.The application realizes the whole process adaptation of compression strategy and transmission scheduling, improves the compression and transmission efficiency while ensuring the lossless and reliable recovery of data.

The application is particularly a kind of interactive transmission method and system of digital live data, relating to streaming media transmission technical field, comprising: sliding window segmentation is carried out to dynamic interaction environment characteristic vector of continuous multiple collection periods to obtain time sequence characteristic sequence, after standardization processing is carried out to the time sequence characteristic sequence, input lightweight time sequence prediction model, output link state prediction confidence and predicted deterioration duration.The lightweight time sequence prediction model is deployed in the edge computing node in the application to predict the link deterioration trend, and when the prediction confidence reaches the trigger threshold, the forward error correction code redundancy upgrade and cache pre-population compensation operation are carried out in advance, which solves the technical problem that the existing passive retransmission strategy introduces additional round trip delay waiting and causes high video stuttering frequency under weak network conditions.

This invention proposes an adaptive cross-frame forward error correction method for low-latency video streams, comprising: acquiring cached video frame data within a protection block; calculating the minimum expected total cost achievable by immediately sending the current protection block as a first minimum expected total cost; calculating the minimum expected total cost achievable by sending the protection block to add the next frame of video as a second minimum expected total cost; if the second minimum expected total cost is less than the first minimum expected total cost, keeping the protection block open to add the next frame of video; if the second minimum expected total cost is greater than or equal to the first minimum expected total cost, closing the protection block and encoding and sending the current protection block. This method significantly improves the video stream's resilience to sudden packet loss and image quality while ensuring a low-latency interactive experience in mobile network environments.

The application discloses a sparse regression code encoding and decoding method for MIMO multiple access channel capacity domain reachability, which adopts a sparse regression code as a forward error correction code of a system. A random transformation matrix is introduced at an encoding end to perform encoding processing on a block sparse signal, so that an equivalent channel matrix is converted into a universal matrix, thereby ensuring decoding reliability of an MA-OAMP receiver under any channel matrix condition, and overcoming the dependence of a traditional AMP receiver on statistical characteristics of an observation matrix. Encoding of the sparse regression code is performed according to an optimal encoding criterion based on the MA-OAMP receiver, power distribution is reasonably performed on sparse blocks, and a time division technique is combined, so that approximation to the whole MIMO-MAC capacity domain is realized.

Various embodiments include methods and devices that enable cable modems or network elements to monitor upstream channels for communications between cable modems and the Cable Modem Termination System (CMTS) and prompt the CMTS to impair an upstream channel with an error rate exceeding a threshold. In some embodiments, cable modems or a network element may periodically request Forward Error Correction (FEC) data from the CMTS and identify whether an upstream channel should be impaired based on predefined error rate thresholds. If an upstream channel is found to have error rates exceeding an acceptable error rate threshold, the cable modem or network element may signal the CMTS to impair that channel. Additionally, the cable modem or network element may continue to monitor impaired upstream channels and signal the CMTS to recover channels that exhibit error rates less than corresponding thresholds.

Systems and methods to transmit data over multiple communication channels in parallel with forward error correction. Original packets are evenly distributed to the channels as the initial systematically channel-encoded packets. Subsequent channel-encoded packets are configured to be linearly independent of their base sets of channel-encoded packets, where a base set for a subsequent channel-encoded packet includes those scheduled to be transmitted before the subsequent packet in the same channel as the subsequent packet, and optionally one or more initial packets from other channels. The compositions of the sequences of the encoded packets can be predetermined without the content of the packets; and the channel-encoded packets can be generated from the original packets on-the-fly by the transmitters of the channels during transmission. When a sufficient number of packets have been received via the channels, a recipient may terminate their transmissions.

The systems and methods described herein provide techniques for improving asset download time using forward error correction to recover lost packets or data. In various implementations, a sending device may be configured to encode redundant data in a data stream that enables a receiving device to reconstruct the data in the file if a portion of the data is not received. The redundant data may be based on single parity, in which the redundant data is generated using XOR (similar to the RAID-5 encoding methods), or the redundant data may be based on dual parity, in which the redundant data is generated using Galois fields (similar to the RAID-6 encoding methods). In some embodiments, the redundant data may be transmitted in separate packets. In other embodiments, the redundant data may be included as part of the data stream.

In one aspect, a method comprises: receiving a data transmission containing at least one orthogonal frequency division multiplexing (OFDM) packet from a second wireless device in a first wireless device; processing the at least one orthogonal frequency division multiplexing (OFDM) packet to recover data and provide the data to a host processor of the first wireless device; encoding at least one decoded symbol of the at least one orthogonal frequency division multiplexing (OFDM) packet with forward error correction encoding in the first wireless device; processing the encoded at least one decoded symbol to recover at least one corresponding transmitted symbol of the at least one OFDM packet; and determining a distance estimate between the first wireless device and the second wireless device, at least partially based on the corresponding transmitted symbol.

Described herein are systems, methods, and other techniques for performing forward error correction in a communication system. A set of data blocks to be transmitted over a wireless channel are received. Rows of a flexible matrix are formed using the set of data blocks based on arrival times of the set of data blocks, each of the rows corresponding to a different time window. A set of random parity blocks are computed by performing row-wise parity operations on the flexible matrix. A set of burst parity blocks are computed by performing column-wise parity operations on the flexible matrix in accordance with a burst parity computation scheme. The set of data blocks, the set of random parity blocks, and the set of burst parity blocks are transmitted over the wireless channel to a receiver.

The application discloses a kind of downlink data processing method, device, equipment and storage medium.The method comprises: receiving the downlink data sent by base station, obtaining time slice field for indicating frame level service attribute from the frame header information of downlink data;Time slice field is parsed as the mapping bitmap for representing terminal equipment set;In the case where the bit of terminal equipment in mapping bitmap is set, forward error correction decoding is carried out to the downlink data to recover the baseband frame payload of downlink data;Protocol encapsulation is carried out to baseband frame payload to obtain protocol data unit;In the case where protocol data unit corresponds to terminal, upper layer processing is carried out to protocol data unit.The scheme introduces frame level service attribute sensing mechanism based on time slice field, mapping bitmap driven terminal determination mechanism and hierarchical downlink data analysis and processing flow, and realizes the efficient cooperation of downlink data in receiving, determination, decoding and protocol processing stage.

It enables IP multicast from a transmitting device to a receiving device via wireless communication, providing stable transmission quality. [Solution] The IP multicast wireless transmission system transmits IP multicast packets from a transmitting device to one or more receiving devices via unidirectional communication. The transmitting device and receiving device are equipped with wireless communication units using a WHDI transmission method or WirelessHD transmission method for transmitting and receiving video signals using radio waves. The system includes a first control device that encapsulates IP multicast packets into a video signal format that can be transmitted using the WHDI transmission method or WirelessHD transmission method and outputs it to the transmitting device, and a second control device that extracts IP multicast packets from the video signals output from the receiving device. Data transmission is performed using an FEC method in which errors occurring in the transmission path between the transmitting device and the receiving device are corrected on the receiving device side.

This application relates to the field of real-time video transmission technology. It proposes a video transmission system, method, device, and medium. In this system, the transmitting end is configured to adaptively calculate the number of original fragments and redundant fragments corresponding to each frame of video, and perform forward error correction coding on each frame based on the original and redundant fragment numbers to obtain the original data packet and redundant data packet corresponding to each frame. The receiving end is configured to sequentially perform forward error correction decoding, frame reconstruction, and decoding operations on the original and redundant data packets to obtain the video. This application performs forward error correction coding by adaptively determining the forward error correction coding parameters for each frame, strictly limiting the forward error correction coding window to a single frame. This allows each frame to perform forward error correction coding and decoding independently, without relying on data from subsequent frames, thereby significantly reducing the first frame recovery latency.

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.

The application discloses a data transmission method, device, equipment, medium and program product. The method comprises the following steps: acquiring an environment state parameter of to-be-transmitted information, wherein the environment state parameter at least comprises a state parameter of a receiving end, and the state parameter of the receiving end comprises a buffer capacity of the receiving end, a freeze frame time length of the receiving end and a signal reconstruction quality of the receiving end; inputting the environment state parameter into a first forward error correction (FEC) unequal error protection strategy model to obtain an FEC protection rate corresponding to the environment state parameter; performing FEC packetization on the to-be-transmitted information according to the FEC protection rate to obtain target transmission information; and performing transmission on the target transmission information based on a transmission link. Stable high-quality data transmission is realized.

The application provides an optical signal processing device, method and electronic equipment, and relates to the technical field of communication. The optical signal processing device comprises: a coherent receiver; an intermediate processing module; a phase and frequency offset recovery module; a phase noise detection module configured to detect the spectral distribution of first phase noise in a signal output by the phase and frequency offset recovery module, wherein the first phase noise is phase noise introduced by XPM; a phase noise whitening module configured to perform whitening processing on the signal output by the phase and frequency offset recovery module according to the spectral distribution of the first phase noise, to obtain a first signal; and a forward error correction module. By converting the probability density distribution of the OSC and the phase noise introduced by the optical signal XPM from not subjecting to Gaussian distribution to subjecting to Gaussian distribution or near Gaussian distribution, the error correction performance of the FEC module can be recovered, and the cross-phase modulation damage can be inhibited while the existing optical signal receiving end structure design is compatible.

This invention discloses a method, system, and medium for coordinating information in continuous-variable quantum key distribution, relating to the field of quantum secure communication technology. The method includes: acquiring initial coherent state data from both parties in a continuous-variable quantum key distribution system; performing reliability enhancement processing on the initial coherent state data falling within a preset fault-tolerant interval, and calculating the reliability of data not falling within the interval and the enhanced data; dividing the data not falling within the interval and the enhanced data according to the reliability and allocating them to a multi-dimensional coordination branch and a slice coordination branch; calculating the log-likelihood ratio soft information in each branch; matching the log-likelihood ratio soft information obtained from each branch with the forward error correction code to meet reliability requirements, performing hybrid forward error correction decoding and verification, and generating a consistent secure key. This invention improves the reliability of soft information, overcomes the performance limitations caused by the independent processing of traditional coordination branches, and improves the coordination efficiency and final secure key rate of the quantum key distribution system.

The application relates to the field of electric communication technology, in particular to a bank remote monitoring video acquisition system and a method thereof, which comprises the following steps: acquiring a maximum time delay, a jitter value and a packet loss rate of a bank remote monitoring video transmission in a first predetermined period before a current time; determining the instability degree of a network in the first predetermined period according to the maximum time delay, the jitter value and the packet loss rate; determining a first adjustment redundancy rate of the current time; determining a real-time video code rate of the current time according to the CPU total load, the CPU load in the first predetermined period, the first adjustment redundancy rate of each time in the first predetermined period and the real-time video code rate of the current time, and performing forward error correction processing on the remote monitoring video transmitted at the current time based on the first adjustment redundancy rate and the real-time video code rate. The application improves the setting accuracy of the redundancy rate parameter, and further optimizes the smooth transmission effect of the video.

Aspects presented herein may improve the latency and power consumption for communications by enabling a wireless device to apply outer coding (OC) (with forward error correction (FEC)) to transmission(s). In one aspect, a wireless device segments each packet data convergence protocol (PDCP) packet in a plurality of PDCP packets into a set of OC symbols, where the plurality of PDCP packets corresponds to a packet data unit (PDU) set. The wireless device assembles multiple sets of OC symbols into an OC block. The wireless device applies an FEC encoding to the OC block. The wireless device outputs the OC block based on the FEC encoding. In some examples, the wireless device also adds an OC header to the OC block, where the OC header includes a symbol size, a set of source symbols, and / or a symbol index associated with the FEC encoding.

The application discloses a network positioning method and system based on topological correlation analysis, relates to the technical field of communication network fault positioning, and comprises the following steps: acquiring a receiving optical power sequence, a forward error correction count sequence, a logical topological relationship and physical resource organization data of a network branch, calculating a branch drift sequence, and establishing a membership relationship between the network branch and a candidate physical positioning unit; generating a common mode drift sequence based on a nearest common ancestor, and performing common mode processing to calculate a selective synchronization coefficient; further calculating a selective interpretation degree of the candidate physical positioning unit, and combining a hierarchical search graph and a swarm intelligence algorithm to obtain an optimal physical positioning unit; finally, determining an affected branch set and a relative confidence degree, and outputting a positioning result. The application can realize fine positioning of a local physical abnormal position of a PON tree-shaped optical network.

A method performed by an electronic device for restoring a loss of data packets is provided. The method includes transmitting, by the electronic device through a communication circuit, first data packets, receiving, by the electronic device through the communication circuit, second data packets transmitted from another electronic device in response to the first data packets, obtaining, by the electronic device, received data based on the second data packets, and by using a forward error correction (FEC) algorithm, restoring, by the electronic device, a lossy packet in the received data and generating, by the electronic device, loss-restored data.

The present application relates to the technical field of audio transmission, and discloses an audio transmission method and device based on a wireless environment, equipment and a storage medium, which are used for improving the continuity and sound quality stability of audio transmission. The audio transmission method based on the wireless environment comprises the following steps: determining a transmission mode level and a corresponding playing layer target depth by acquiring multi-dimensional channel quality parameters and scoring; adjusting a sending rate and determining a retransmission time window according to a buffer occupancy rate; switching an encoding format at an audio frame boundary; and performing forward error correction and negative acknowledgement retransmission in a window when a data packet is lost.

The application provides an optical forward error correction encoding method and device, comprising a laser, a signal generator, an electro-optical intensity modulator, a mode beam splitter, a mode demultiplexer and a photoelectric detector. The application realizes electro-optical conversion of a signal to be processed through the electro-optical intensity modulator, and changes power of different mode optical signals to load weight matrix element values through the mode beam splitter. The output signals of different modes are separated through the mode demultiplexer, and then are transmitted to different photoelectric detectors in parallel. The photoelectric detector re-maps the signals to the electrical domain for post-processing, and completes matrix-vector multiplication calculation. The application has high integration, good scalability and low energy consumption, can conveniently load weights, and has the potential to realize high-speed calculation. The application can not only be applied to forward error correction encoding, but also be applied to other scenarios requiring matrix calculation.

An encoder includes: a feedforward module configured to receive to-be-encoded data with a parallelism of n symbols per cycle, and perform calculation in a finite field based on a symbol of the to-be-encoded data in a current cycle, to obtain a single-cycle polynomial corresponding to the current cycle; and a feedback module configured to receive the single-cycle polynomial corresponding to the current cycle output by the feedforward module, and perform calculation in the finite field based on the single-cycle polynomial corresponding to the current cycle and a first polynomial indicating a symbol received in a historical cycle, to obtain a second polynomial, where the second polynomial is used to determine a target polynomial indicating the to-be-encoded data, and the target polynomial is to generate a check sequence of the to-be-encoded data, to obtain a codeword obtained by encoding the to-be-encoded data based on a forward error correction (FEC) encoding scheme.

In one aspect, a method includes: receiving, in a first wireless device, a data transmission that includes at least one orthogonal frequency division multiplexing (OFDM) packet from a second wireless device; processing the at least one OFDM packet to recover data and provide the data to a host processor of the first wireless device; encoding, in the first wireless device, at least one decoded symbol of the at least one OFDM packet with forward error correction coding; processing the encoded at least one decoded symbol to recover at least one corresponding transmitted symbol of the at least one OFDM packet; and determining a distance estimate between the first wireless device and the second wireless device based at least in part on the corresponding transmitted symbol.