672 results about "Polar code" patented technology

The invention discloses an anti-turbulence free space optical communication method based on receiving and transmitting joint optimization, which balances the code length and the code rate through a Polar coding mode of an atmospheric turbulence channel, and ensures the coding and decoding overhead; meanwhile, a Transform model based on convolution enhancement is designed at a receiving end, learning of local features is enhanced through convolution, the relation between phase screen pixels is established, and a conjugate phase screen is given by the model for turbulence compensation. In order to solve the problem that in a free space optical transmission system, the atmospheric turbulence effect interferes with an OAM light beam, the influence of atmospheric turbulence interference on free space optical communication is relieved in a mode of joint optimization of the receiving end and the transmitting end. Error codes caused by atmospheric turbulence are corrected through Polar coding of the transmitting end, and the coupling efficiency of receiving light spots is improved after phase compensation of the receiving end, so that the mode purity obtained by corrected light spot images is improved, and the error rate of the system is reduced.

The invention provides an OFDM signal receiving and processing system and method suitable for an NAVDAT system. According to the method, the characteristics that NAVDAT system signals have synchronous headers, pilot frequencies and the like are fully considered, firstly, the synchronous headers are used for carrying out correlation operation on received data to search a frame starting point, and a signal frame to be demodulated and decoded is obtained in combination with a constant false alarm detection algorithm; and subsequently, carrying out symbol synchronization to determine the FFT window position. Secondly, in combination with a discrete pilot signal, estimating an integral multiple frequency offset error, namely coarse synchronization, and further realizing estimation of a decimal multiple frequency offset error, namely fine synchronization, so as to realize frequency synchronization. And then, channel estimation is carried out by using the pilot signal and adopting a least square method to obtain the channel frequency response of the pilot, the frequency response of the complete signal is obtained through interpolation, and the rough estimation result is further processed through the designed RCAFCN network to obtain accurate channel estimation, so that the original OFDM signal is recovered. And finally, extracting a data part in the OFDM signal according to a frame structure, realizing soft demodulation through a log-likelihood ratio mode, decoding data of a signaling part by using a polarization code, and decoding data of a service part by using a low-density parity check code, thereby realizing complete demodulation and decoding. The method provided by the invention can effectively reduce inter-symbol interference and inter-carrier interference existing in OFDM signals, compensate channel distortion, reduce noise influence, improve decoding precision, improve communication quality, realize optimization of NAVDAT system baseband processing, and guarantee sailing safety of ships on the sea by combining with an existing marine broadcast system.

The invention belongs to the technical field of communication, and particularly relates to a multiplication active code decoding method based on an SO-ORBGRAND decoder. The SO-ORBGRAND decoder outputs soft information by calculating a correct posterior probability of a conjecture code word sequence, and high-performance decoding is realized through soft information exchange and optimization processing between the row decoder and the column decoder. In the iteration process, a method for judging the validity of the code word through the check matrix is designed by utilizing the polarization characteristic of the multiplication active code, so that the iteration is supported to jump out in advance to reduce the complexity. The invention provides a multiplication active code decoding algorithm based on an SO-ORBGRAND decoder, and compared with various non-system multiplication active code decoding algorithms and the performance of traditional long-code polarization codes, the method has remarkable advantages in error correction performance; a method for judging the validity of the code word through the check matrix by utilizing the polarization characteristic design of the multiplication positive code is provided, the complexity is reduced while the judgment success rate is improved, and the implementation overhead is reduced.

The invention belongs to the field of star flash mouse communication, and discloses a star flash mouse low-power-consumption communication system and method based on Polar code and SLE collaborative optimization, the system adopts a layered architecture design, collaborative optimization of energy efficiency and performance is realized through deep coupling of a physical layer and a link layer, and the performance of the system is improved. The core of the system is composed of three functional units including a Polar code coding module, an SLE control engine and a cross-layer optimization interface, and a complete closed-loop control system is formed. According to the invention, through deep cooperation of the Polar code and the SLE mechanism, the overall power consumption is reduced by 42.7% compared with the traditional scheme; according to the Polar code dynamic construction method based on track prediction, an ultra-low bit error rate of 10 <-5 > magnitude can still be kept in a 2.4 GHz complex interference environment, and in combination with signal-to-noise ratio self-adaptive coding parameter adjustment, it is ensured that transmission delay within 0.5 ms is always kept from a low-speed office scene to a high-speed electronic sports scene; in the aspect of engineering implementation, the method has the capability of quickly adapting to hardware platforms of different manufacturers, and a complete solution with high performance and low cost is provided for large-scale commercial use of the satellite flash technology in the consumer electronics field.

The invention provides a polarization code optimization method for a TLC flash memory, which belongs to the technical field of polarization code optimization of an NAND flash memory, and comprises the following steps of: firstly, constructing a polarization code based on a Monte Carlo method: randomly generating code words in each simulation, coding after setting frozen bits, transmitting and reading data through a flash memory channel, counting and accumulating sub-channel error times by using SC decoding, and calculating an error probability; the information bit determination process is optimized according to P / E cycle times for flash memory characteristics; data to be stored in a flash memory are coded based on PC-CASCL, an original binary bit sequence is averagely segmented, PC codes of all sub-segments are added with check bits, after the sub-segments are combined, CRC coding is carried out through a preset polynomial, polar code coding is carried out on a result, and the result is stored in the flash memory. After the coded data is read from the flash memory, decoding is carried out through PC-CASCL, a decoder is initialized, the maximum path number is set, a path list is created, whether the bits are odd-even check bits or not is judged and checked bit by bit, and after all the bits are decoded, an optimal path is selected as output through CRC code check.

The invention relates to the technical field of coding and decoding, and discloses a DNA storage coding and decoding method and device, electronic equipment and a storage medium, and the method comprises the steps: carrying out the information filling of to-be-coded data, and obtaining a target binary sequence; encoding and mapping the target binary sequence to obtain a DNA base sequence; identifying a coding error mode of the to-be-coded data according to the DNA base sequence; and according to the coding error mode, selecting a corresponding decoding algorithm to decode the DNA base sequence to obtain decoding data. Through the implementation of the invention, data conversion and information filling are performed on the to-be-coded data, so that the length of the to-be-coded data can meet the length requirement of the polarization code; the coding error mode corresponding to the DNA base sequence is identified for decoding, the decoding accuracy can be effectively improved through different coding error modes, and lossless compiling of the to-be-coded data is realized.

The invention discloses a communication method and device, relates to the technical field of communication, and can improve the decoding performance and improve the flexibility of a Polar code used for HARQ (Hybrid Automatic Repeat reQuest) transmission. The method comprises the following steps: performing polarization coding on an information bit sequence with the length of K to obtain a first sequence with the length of M0; wherein K is smaller than or equal to M0; sending Ex bits in the first sequence when the data is retransmitted for the xth time; wherein x is a positive integer, and one or more bits in the Ex bits are repeated one time or more than one time in the bits included from the initial data transmission to the xth data retransmission.

The invention belongs to the technical field of polarization codes, and discloses a large nuclear polarization code BP decoding algorithm based on a pruning permutation factor graph, and the algorithm comprises the steps: firstly, randomly generating a permutation factor graph; secondly, deleting nodes with low contribution degree and non-contribution degree to decoding through pruning operation; and when the stop condition is not met, replacing the factor graph to execute BP decoding of the pruned and permutated factor graph until the stop condition is met. For a large nuclear polarization code, a permutation factor graph can improve the decoding performance, and a pruning factor graph can reduce the decoding complexity. A simulation result shows that compared with a BP decoding algorithm, the algorithm provided by the invention can ensure that the complexity is not too high and the decoding performance is improved at the same time.

The invention discloses a communication method and a communication device based on a polarization code, and the method comprises the steps: when a coding side carries out the coding of a current first to-be-coded bit block, determining a frozen bit adopted by the current coding encryption based on a second information bit or a second frozen bit associated with a second coding bit block transmitted last time, the coding and encryption integrated secure communication is realized, the randomness of the frozen bits is improved, the frozen bits are not easy to obtain by an eavesdropper, the leakage of the frozen bits is avoided, and the security of coding and encryption is improved.

Embodiments of this application provide a communication method and apparatus, to reduce complexity of a polar code construction process. The method includes: obtaining a to-be-encoded bit sequence, where the to-be-encoded bit sequence includes K information bits, and K is an integer greater than 0; determining a first sequence, where positions of the K information bits in the first sequence are determined based on a second sequence corresponding to a target code rate and a value of K, the second sequence is used to represent selection priorities of N0 bit positions, and N0 is an integer greater than K; performing polar code encoding on the first sequence to obtain a third sequence; and sending the third sequence. The second sequence is designed for a constant code rate, and a same sequence may be used to construct a series of polar codes having a same code rate and different lengths.

The invention relates to a power equipment multi-modal data real-time acquisition and monitoring system based on a star flash ad hoc network, and belongs to the technical field of power Internet of Things. Aiming at the problems of high communication delay, large multi-source data fusion error and poor complex environment adaptability in power equipment monitoring, the method comprises the following steps: 1) constructing a star-flash dynamic ad hoc network, and modulating by adopting FHSS frequency hopping and QPSK-polarization code (error rate lt; 10-6) the anti-interference performance is improved; 2) designing a multi-modal data space-time alignment algorithm (IEEE 1588v2 + DTW interpolation) and a dynamic weight fusion strategy (normal / fault working condition weight 0.6-0.2); and 3) three-dimensional visualization and edge AI fault positioning are realized based on digital twinning, and the accuracy rate is 98.5%. The system reduces the operation and maintenance cost by 67%, and is suitable for high-precision monitoring scenes such as a transformer substation.

A device is configured for encoding an input sequence comprising message bits into a codeword using a polar code. The device is configured to sequentially encode each of a plurality of blocks of the input sequence by applying a sliding window to the input sequence, wherein each block of the input sequence is encoded based on an XOR operation of the block and a previous block of the input sequence to obtain a codeword block of the codeword, and sequentially output each obtained codeword block of the codeword.