8 results about "Convolutional code" patented technology

An apparatus configured to apply a convolutional precoder with a time-varying polynomial to an information vector to generate a precoded vector, wherein coefficients of the time-varying polynomial are generated by a pseudo-random number generator (PRNG) using a radio network temporary identifier (RNTI) as an initialization seed, generate a polarization-adjusted convolution (PAC) codeword based on the precoded vector and transmit the PAC codeword.

The invention discloses a prediction-based Internet of Vehicles code retransmission method and system and electronic equipment, and is applied to the field of Internet of Vehicles network transmission. The method comprises the following steps: collecting network states and vehicle motion characteristics of a plurality of transmission paths, and constructing a multi-modal tensor; constructing a prediction model by using a time sequence convolution encoder and an attention mechanism, and predicting a link state; a main path and an auxiliary path are screened according to the prediction result, the main path sends an original data packet, and the auxiliary path sends a polarization adjustment convolutional coding check packet generated based on the predicted packet loss rate; and the edge server carries out decoding by using the verification packet during packet loss, and feeds back a transmission result to update prediction model parameters. According to the method, the problems of high packet loss rate and retransmission delay jitter of the Internet of Vehicles in a high dynamic scene can be relieved by utilizing heterogeneous path cooperative transmission and a prediction-based polarization adjustment convolutional code coding retransmission mechanism, and technical support is provided for Internet of Vehicles services such as automatic driving.

The application discloses a QPSK phase ambiguity identification method based on convolution code, and comprises the following steps: firstly, 8 sequences are spliced from 8 kinds of phase ambiguities existing in QPSK demodulation according to demodulated I and Q data; secondly, an equation is established according to the coding constraint relationship of the convolution code; finally, the probability of the equation being established is taken as a standard for measurement, and 8 sequences are screened to reduce the number of phase ambiguities. According to the method, one sub-checking element of one code rate of the convolution code only needs to be stored, and the number of 8 kinds of phase ambiguities is reduced to two, so that the consumption of resources is reduced compared with a traditional phase ambiguity elimination mode. Meanwhile, the application can be realized only by binary multiplication and accumulation, and the calculation complexity is low and the algorithm structure is simple compared with a traditional method.

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%.

Methods and devices are provided in which a channel encoded with a polarization-adjusted convolutional (PAC) code is received. A decoded codeword is generated based at least in part on simplified successive cancellation list (SSCL) decoding performed on the channel via a decoding tree. The decoding tree includes a node that generates candidate codeword output based on predefined processing using convolutional code (CC) state input and channel vector input. A sub-tree of the node remains unprocessed.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Error-correcting performance of polarization-adjusted convolutional codes is improved by refreezing low weight indices. For information bits ( k ), where k is a positive integer, a plurality of convolutionally encoded bits (n) are generated by performing a convolutional encoding operation on the plurality of information bits and a plurality of frozen bits (n - k ), where n is a positive integer. A refreezing operation is performed on the convolutionally encoded bits, including dynamically assigning zeros to selected frozen indices such that a number of low weight codewords is reduced. Polar encoded bits are generated by performing a polar encoding operation on an output of the refreezing operation, providing polar encoded bits for transmission or storage.