8results about How to "Reduce decoding complexity" patented technology

The invention relates to the technical field of communication, in particular to a splitting and recombining method for improving transmission efficiency and reliability of a security protocol data unit, which is characterized in that a module adopting a random additive noise decoding algorithm is inserted between a security communication layer and a black channel on the basis of a framework of an IEC61784-3 standard, and is used for error correction processing of CRC (cyclic redundancy check) coding SPDU (security protocol data unit); a standard black channel security communication protocol architecture can be seamlessly connected, performance expansion and popularization in an industrial scene are facilitated, a splitting / recombination mechanism of a long SPDU is provided, splitting processing is performed on the long SPDU from a security communication layer, a plurality of short packet SPDUs are formed, guess decoding of a receiving end is facilitated, SPDU transmission reliability is improved, and retransmission probability is reduced. The short packet SPDU from the black channel is subjected to parallel guess decoding, the decoding complexity is remarkably reduced, the performance is remarkably improved compared with a traditional CRC error detection mechanism, and therefore the problem that an existing security protocol data unit is poor in transmission reliability is solved.

The invention discloses a rate division multiple access communication network total rate optimization method and system, and belongs to the technical field of communication. The method comprises the following steps: constructing a downlink rate segmentation multiple access communication system model based on an intelligent reflecting surface; the communication system model comprises a base station, an intelligent reflecting surface and a user side; grouping users in the user side, and constructing a hierarchical rate segmentation multiple access model based on user grouping; the hierarchical rate segmentation multiple access model comprises a corresponding relation between the user group and information flow generated by the base station; and according to the hierarchical rate segmentation multiple access model and the intelligent reflecting surface, assisting downlink communication between the base station and the user side. According to the method and the device, the layered rate division multiple access model is constructed by grouping the users, and the system performance is improved by combining the intelligent reflecting surface passive beam forming and the rate division multiple access active beam forming, so that the problems of spectrum resource shortage and signal interference can be solved, and the spectrum efficiency is greatly improved.

The invention belongs to the field of wireless communication, and provides a space-time coding spatial modulation method and system based on an intelligent reflecting surface, and the method comprises the steps: carrying out the different phase modulation of a signal transmitted by a single transmitting antenna at different time slots through employing the characteristics of RIS, enabling the transmitted signal to have a format similar to Alamouti space-time coding, and enabling the transmitted signal to have a space-time coding format; therefore, a second-order transmit diversity can be obtained; and meanwhile, the known channel state information is utilized to reconstruct the propagation channel, so that the signal-to-noise ratio at the selected receiving antenna is maximized, and the system performance is improved. In addition, the method provided by the invention supports a linear decoding method of a receiving end, so that the decoding complexity is relatively low. A simulation experiment shows that under different parameter configurations and different spectrum efficiencies, the scheme (RIS-AlaSM) has better bit error rate performance compared with the existing RIS-RQRM (RIS-RQRM) based on the RIS.

The application belongs to the technical field of communication, and discloses a stack decoding method, system, device, medium and terminal based on a soft output, which comprises the following steps: creating a structure and a stack and initializing; repeatedly judging the size of the path length in the structure at the top of the stack and the depth of a decoding tree, if the path length in the structure at the top of the stack is smaller than the depth of the decoding tree, recalculating the path metric, and sorting the stack according to the size of the path metric until the path length in the structure at the top of the stack is equal to the depth of the decoding tree, and counting the soft output probability of each decoding result; and correcting the decoding result according to a preset threshold to obtain a final decoding result. The method disclosed by the application can effectively reduce the calculation complexity under the premise of a low signal-to-noise ratio. In the case of (128, 64), compared with the traditional stack decoding, the stack decoding method of the polar adjustment convolution code based on the soft output can reduce the calculation amount by 82%.

The invention particularly relates to a polarization code PSS-RF-SCL decoding method based on a reliability function. In order to reduce decoding complexity and abandon a traditional path splitting strategy based on a search set, a path splitting strategy based on a reliability function is provided, and according to the strategy, whether information bits need to be subjected to path splitting or not is judged through the value of the reliability function. Secondly, a pruning strategy depending on an auxiliary path metric value is provided, and a PSS-RF-SCL decoding method is provided on the basis of the two decoding strategies for reducing complexity. During decoding, information bits with reliability function values lower than a threshold value alpha are regarded as bits needing path splitting, and paths with auxiliary path metric values higher than a threshold value beta are regarded as unreliable paths to be pruned. The threshold value alpha and the threshold value beta are obtained through statistical experiments. A simulation result shows that compared with a traditional path splitting strategy auxiliary SCL decoding method based on a search set, the provided PSS-RF-SCL decoding method has the advantage that the decoding complexity is obviously reduced on the premise of no performance loss.

The present invention provides a BPL decoding algorithm for a CRC-LDPC-Polar cascade system. In the cascade system, a cyclic redundancy check and an inverse-coded codeword check of a polarization code generation matrix are used as early stopping criteria, and a BP decoding algorithm is first used. If the check fails, a BPL decoding algorithm is then used, and the decoding complexity of the BPL decoding algorithm in the cascade code is reduced by reducing the number of iterations of the cascade code decoding algorithm. In addition, a new factor graph selection method is proposed for the BPL decoding algorithm of the polarization code. The factor graph selection method uses the mean of the polarization channel log-likelihood ratio in the polarization code Gaussian approximation construction method to select L decoding factor graphs of the BPL decoding algorithm, so that the BPL decoding algorithm of the cascade system can also have better error performance when the list size L is small.

This invention belongs to the field of channel coding technology, specifically relating to a low-complexity decoding method based on SC decoding. The method includes: performing SC decoding at the decoding end, followed by CRC verification; if the verification passes, the decoding result is obtained; otherwise, CA-SCL decoding is performed, including calculating a metric value based on the channel reliability estimate obtained after SC decoding, the log-likelihood ratio of the information bits, and the index value of the information bits; constructing a path splitting set B based on the metric value; performing path splitting on the path splitting set B, with the remaining bits directly hard-determined to obtain the decoding path; after decoding, performing CRC verification on all paths; if a path passes the CRC verification, selecting the path with the smallest PM value as the successfully decoded path; otherwise, decoding fails, and a retransmission of information is requested. This invention reduces the number of decoding path splits and the average list size, thus reducing decoding complexity.

A method for wireless communication, comprising: receiving a synchronization signal block from a base station, the synchronization signal block comprising coded bits corresponding to a physical broadcast channel payload; decoding the coded bits according to polarization decoding processing to generate polarized decoded bits; decoding the polarized decoded bits according to cyclic redundancy check decoding processing to generate physical broadcast channel payload bits; obtaining a portion of timing-related bits from the physical broadcast channel payload bits according to bit mapping, the timing-related bits being used to indicate the timing of the synchronization signal block in a synchronization signal burst from the base station; and processing the synchronization signal block according to the portion of timing-related bits. By utilizing the present invention, a portion of timing-related bits can be obtained more efficiently, thereby reducing decoding complexity and power consumption.