11 results about "Frame error rate" patented technology

This invention relates to the field of MESH transmission technology and discloses a ring-redundant transmission system and method for MESH self-organizing networks on offshore platforms. The method involves: collecting the first channel quality parameters of each directed link between nodes and determining the primary transmission path and backup transmission paths; encapsulating the first service data into a ring-shaped transmission frame; when the second channel quality parameters of the primary transmission path meet the single-path transmission thresholds for received signal strength and frame error rate, sending the ring-shaped transmission frame unidirectionally to the destination node via the primary transmission path to obtain the second service data; when the second channel quality parameters of the primary transmission path meet the redundancy trigger thresholds for received signal strength and frame error rate, generating two copies of the ring-shaped transmission frame and sending them to the destination node respectively to obtain the second service data. This invention achieves continuous and stable operation of the MESH self-organizing network communication link on offshore platforms under fault conditions.

The invention discloses an interleaving method combining dynamic bit loading and ROBO interleaving. According to the method, sending parameters are configured at a sending end based on copy times, subcarrier granularity and a modulation loading table which are fed back by a receiving end; then frame control and frame load data are processed respectively, improved ROBO interleaving combined with Bitloading is adopted for frame load, and framing is carried out on the frame load and a preamble signal through the steps of IFFT, cyclic prefix adding and the like. And after completing signal recovery and subcarrier SNR evaluation, a receiving end dynamically determines and feeds back key parameters according to different system requirements of low feedback signaling or high transmission rate. And the sending end reconfigures and generates the data frame according to the feedback. Through deep fusion of Bitloading and ROBO interleaving and flexible parameter adaptation, transmission reliability, rate and feedback overhead are effectively considered in a complex channel environment, and efficient data transmission with a low frame error rate is realized.

The invention belongs to the technical field of carrier communication, and discloses an HPLC (High Performance Liquid Chromatography) anti-interference and dual-mode switching method and system based on channel state prediction, and the method comprises the steps: firstly, based on HPLC frame-level communication data, calculating frame-level statistical characteristics such as a frame bit error rate and average retransmission times, and constructing a time sequence; predicting the deterioration probability of a carrier channel based on the time sequence, and synchronously evaluating the prediction credibility; and finally, according to the deterioration probability and the prediction credibility, controlling the communication system to migrate among three communication states of carrier enhancement, double-link parallel and wireless primary use. The method can identify the channel degradation trend in advance, reduces frequent switching, improves the stability and reliability of a communication system, adapts to the existing dual-mode communication equipment, and has a remarkable practical value.

The present application relates to the technical fields of Internet of Things wireless communication and embedded device firmware upgrade, and relates to a self-adaptive differential firmware upgrade method and system for low-bandwidth wireless communication, the self-adaptive differential firmware upgrade method for low-bandwidth wireless communication comprising the following steps: S1: an upgrade end receives current channel quality parameters reported by a terminal device, wherein the channel quality parameters comprise signal-to-noise ratio and received signal strength; S2: the upgrade end calculates an optimal slice size for this round of transmission based on the signal-to-noise ratio and according to a preset slice size mapping function; the calculation process is as follows: when the channel quality is better than a preset threshold, the slice size is increased to improve the payload ratio; when the channel quality is worse than the preset threshold, the slice size is reduced to reduce the single-frame error rate; and S3: the upgrade end divides differential packets to be transmitted into an ordered slice sequence according to the optimal slice size, and independently calculates a CRC-16 check code for each slice and appends the check code to the tail of the slice.

The application provides a field bus remote diagnosis method and related device, and belongs to the technical field of industrial communication network diagnosis.The application solves the problems that the traditional field bus diagnosis system is difficult to realize real-time monitoring of remote equipment and remote communication is susceptible to electromagnetic interference, resulting in low data transmission reliability.The device comprises an optical communication unit, a data processing unit and a diagnosis analysis unit;the optical communication unit performs photoelectric conversion on the received optical signal and outputs a clock synchronization electrical signal;the data processing unit decodes and protocol analyzes the field bus sending data;the diagnosis analysis unit extracts the slave station response delay time, frame error rate, signal amplitude attenuation coefficient and bus load rate based on the analyzed data, and identifies faults accordingly.The application adopts optical communication transmission and adaptive clock recovery technology, realizes high-reliability remote real-time monitoring and intelligent fault diagnosis against strong electromagnetic interference within a range of 10 kilometers, and can be widely applied to large industrial fields such as thermal power generation and petrochemical industry.

Neural Normalized MinSum (N-NMS) decoding for improving frame error rate (FER) performance on linear block codes over conventional normalized MinSum (NMS). Dynamic multiplicative weights are assigned to each check-to-variable message in each iteration to efficiently provide training parameters of N-NMS that support N-NMS for longer block lengths. Embodiment are described for neural two-dimensional normalized MinSum (N-2D-NMS) decoders requiring fewer training parameters. The N-2D-NMS approaches for example use the same weight for edges with the same check and / or variable node degree. Simulation results indicate that that this LDPC decoding performs similarly to previous techniques while substantially reducing the amount of training necessary.

The application relates to the technical field of wireless networking, in particular to a dynamic ad hoc networking method and system for intercoms, which comprises the following steps: for a pre-established intercom network, in the process of adjusting the transmission rate of each node by an RRAA algorithm, the length of the next window of each window of each node is obtained; the time interval of two adjacent adjustment of the spreading factor of each node is recorded as a spreading factor stable interval, whether to adjust the spreading factor of each network is evaluated by comparing the frame error rate of each node in each window and the value of MTL and ORI in the spreading factor stable interval of each window; the spreading factor of each node is adjusted; in the route discovery process of the AODV protocol, the RREQ received by each node is updated; whether to discard the non-first RREQ received by each node is evaluated; and the routing selection of the intercom is carried out according to the AODV protocol. The application aims to improve the throughput and communication performance of the intercom network.

The application discloses a traffic mode analysis method and system for PON topology anomaly identification, and relates to the technical field of optical communication network management, wherein the method comprises the following steps: collecting operation and maintenance indexes such as traffic, optical power and frame error rate of each optical network unit, and constructing a traffic distribution vector based on the data, and combining historical normal states to perform time sequence characteristic modeling; using a self-encoder model, learning the mode of traffic behavior and detecting anomalies by calculating reconstruction error and information divergence; using traffic correlation matrix difference analysis to further quantify changes in the topology structure, and forming a comprehensive anomaly index by comprehensively considering three anomaly indexes, so that PON topology anomalies can be determined once the index exceeds a set threshold. Therefore, the real-time monitoring and intelligent identification of PON network faults can be realized through multi-dimensional operation and maintenance index fusion and time sequence convolution self-encoder modeling without additional physical equipment.

The invention discloses a string optimization method and system for a QC-QLDPC code and an SC-QLDPC code, and mainly solves the problem of low decoding performance caused by difficulty in suppressing a string structure from a topological structure level due to optimization only through a back-end decoding algorithm in the prior art. According to the implementation scheme, the method comprises the following steps: executing six-ring and eight-ring chord search for a QC-QLDPC code; and in a vector space of the QC-QLDPC code protograph matrix, a breadth-first search strategy is adopted to screen an optimal parameter combination satisfying quantum code structure constraints and having a minimized string number. The method comprises the following steps: for an SC-QLDPC code, dividing the SC-QLDPC code into a plurality of sub-blocks with a QC-QLDPC code structure, constructing a processing window, and executing string search in parallel to obtain the number of strings; a subblock-by-subblock iterative optimization strategy is adopted, and global constraint is applied to suppress a cross-subblock chorded short ring generated in a space coupling process, so that an SC-QLDPC code matrix parameter combination with the minimized number of chords is obtained under the condition that quantum code structure constraint conditions are met. According to the method, the frame error rate and symbol error rate performance of the two codes are effectively improved, and the method can be used for quantum error correction and quantum code string search and optimization of quantum chips and devices.

The invention belongs to the technical field of communication channel coding, and particularly relates to a space coupling polarization code construction and decoding method under an AWGN channel, which comprises the following sequentially executed steps: S1, acquiring a reliability distribution sequence adaptive to the AWGN channel by adopting a Gaussian approximation algorithm; s2, calculating performance improvement scores under different coupling ratios by taking the bit error rate and the frame error rate of the first iteration as base lines, and selecting the ratio with the highest performance improvement score as the optimal coupling ratio; s3, generating a space coupling structure based on the optimal coupling ratio and the reliability distribution sequence; s4, optimizing the time aggregation weight based on the normalized kurtosis score, and obtaining system operation parameters; s5, performing enhanced iterative decoding, and outputting a decoding result; a quality index optimization weight coefficient is introduced, and time domain correlation among different iteration stages is fully mined.

The invention is suitable for the technical field of equipment communication, and provides a mower communication method, a mower and a storage medium, the method comprises the following steps: when the mower communicates with other equipment, first communication quality parameters are acquired, the first communication quality parameters comprise at least one of a packet loss rate, a CRC error rate and a data frame error rate; if the first communication quality parameter is not in the preset interval, the transmission of the current data frame has a problem. Acquiring a second communication quality parameter, and determining a current scene where the mower is located according to a parameter interval where the second communication quality parameter is located; and if the current scene is the preset scene, the mower switches the communication channel to a second communication channel. Whether the current data transmission problem is caused by environmental interference can be determined according to the second communication quality parameter, and if it is determined that the data transmission is not good enough due to environmental interference, it is ensured that the transmission quality of the data frame meets the requirement after channel switching through a channel switching mode.