20 results about "Frame error rate" patented technology

This invention discloses a method for adaptive transmission power in ultraviolet (UV) optical communication. By simulating the frame error rate of the system's modulation and coding scheme, the signal strength required for successful decoding under different background noise intensities is obtained. The transmitter sends several data frames to the receiver and records the current link's transmission power. The receiver obtains the current link's signal strength and noise intensity data using channel estimation, quantizes it, and feeds it back to the transmitter. The transmitter judges the noise intensity; if the noise intensity is within a set noise intensity range, it determines that the background noise is in the i-th quantization interval, thus obtaining the signal strength required for successful decoding. Based on the current transmission power and the signal strength required for successful decoding, the feedback transmission power is obtained, and the corresponding UV LED power is selected to transmit the signal, achieving adjustable transmission power. This method can select different transmission powers at different transmission distances, achieving reliable data transmission with low power consumption.

The invention discloses a flow mode analysis method and system for PON topology anomaly recognition, and relates to the technical field of optical communication network management, and the method comprises the steps: collecting the flow, optical power, frame error rate and other operation and maintenance indexes of each optical network unit, constructing a flow distribution vector based on the data, and carrying out the time sequence feature modeling in combination with a historical normal state; performing mode learning and anomaly detection on traffic behaviors by using an auto-encoder model and calculating a reconstruction error and information theory divergence; the change of the topological structure is further quantified by adopting traffic correlation matrix difference analysis, three abnormal indexes are integrated to form a comprehensive abnormal index, and PON topology abnormity can be judged once the comprehensive abnormal index exceeds a set threshold value. Therefore, real-time monitoring and intelligent identification of PON network faults can be realized through multi-dimensional operation and maintenance index fusion and a time sequence convolution auto-encoder model without additional physical equipment.

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 a code rate adaptive data coordination method suitable for continuous variable quantum key distribution, and belongs to the technical field of continuous variable quantum key distribution. Aiming at the problem that the existing method cannot realize stable and efficient extraction of a key in a key distribution system, high coordination efficiency under a specific code rate is realized by using a protograph LDPC code, and then code rate compatibility is realized through a specific matrix puncturing technology, so that an error floor is effectively reduced, and the key distribution efficiency is improved. And stable and efficient data coordination is realized in a relatively large signal-to-noise ratio range. Through simulation tests, the self-adaptive range of the signal-to-noise ratio is 0.028-0.252, the coordination efficiency can reach more than 95%, the average frame error rate is about 30%, the robustness of the system is effectively improved, and the application of the continuous variable quantum key distribution technology in actual scenes is promoted.

The application relates to the technical field of communication channel coding, and discloses a high-performance polar code construction method for a BP decoder. The method first uses a noiseless BP decoding analysis method or a binary expansion grouping reliability sorting algorithm to obtain n+1 polar channel groups and reliability sorting, wherein the polar code length N=2 n , n is a positive integer; secondly, a noiseless BP decoding analysis method assisted by a wizard is used to obtain the reliability sorting of different polar channels in each group, so that the reliability sorting of N polar channels is determined; finally, according to a specific code rate R, the indexes of NR polar channels with high reliability are selected as information bits, and the indexes of the remaining N-NR polar channels are selected as frozen bits, so that the construction of the polar code with the code length N and the code rate R is completed. The construction method is independent of an actual channel, can effectively reduce the complexity of the polar code construction for the BP decoder, and can improve the error correction performance in a low frame error rate region.

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.

A method and an apparatus for measuring a frame error rate, reducing duration of measuring the frame error rate. A first device obtains an error frame, obtains channel information and / or interference information corresponding to the error frame, and determines a frame error rate based on the channel information and / or the interference information corresponding to the error frame. The method for determining the frame error rate based on the channel information and / or the interference information corresponding to the error frame can reduce a quantity of transmitted test frames. For example, a total quantity of frames needs to be only 1% or even less of a total quantity of frames required for a current MC method. In other words, a quantity of test frames used for obtaining an accurate frame error rate needs to be only 1% or even less of the total quantity of frames required for the current MC method. Therefore, the measurement duration can be reduced, and measurement efficiency can be improved.

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 relates to the technical field of wireless networking, in particular to a dynamic ad hoc network method and system for an interphone, and the method comprises the steps: obtaining the length of a next window of each window of each node in a process of adjusting the transmission rate of each node through an RRAA algorithm for a pre-established interphone network; recording the time interval of two adjacent times of spread spectrum factor adjustment of each node as a spread spectrum factor stable interval, and evaluating whether to adjust the spread spectrum factor of each network by comparing the frame error rate of each node in each window with the MTL and ORI values in the spread spectrum factor stable interval where each window is located; the spreading factor of each node is adjusted; in the route discovery process in the AODV protocol, updating the RREQ received by each node; evaluating whether a non-first RREQ received by each node is discarded or not; and carrying out routing selection of the interphone according to the AODV protocol. The invention aims to improve the throughput and communication performance of the interphone network.

A signal processing method includes: dividing a bit sequence into multiple groups of bit segments, generating extended bit segments according to the bit segments and a cyclic redundancy check code, interleaving each group of the extended bit segments into a sub-block group, and modulating each sub-block into a modulated symbol sub-block; compressing all the modulated symbol sub-blocks into multiple sparse regression code words using a preset compression matrix, and transmitting a wireless signal according to the multiple sparse regression code words. After encoding in combination of the CRC code and the sparse regression code, using approximate message passing decoding and list decoding during decoding can effectively reduce the frame error rate and the bit error rate.

Adaptive transmission of uplink video data in remote driving applications using Automotive Safety Integrity Level (ASIL) requirements. A User Equipment (UE) transmits a configuration report that includes ASIL requirement information for associated cameras to a base station. The UE then transmits video data according to a transmission strategy based on the ASIL requirements. The UE can also transmit a status report indicating missed frames and a target frame error rate to allow the base station to dynamically adjust the transmission strategy. In another aspect, the UE identifies required repetitions or retransmissions based on the ASIL requirements and transmits an indicator of this to the base station. The base station then receives the video data using the indicated repetition / retransmission strategy. The ASIL requirements ensure the required reliability and low latency for the uplink video transmissions in remote driving while the adaptive techniques optimize resource utilization based on network conditions.

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.