50results about How to "Guaranteed decoding performance" patented technology

The invention provides a method for realizing the equalization of an FBMC system by utilizing improved sphere decoding algorithm, which comprises the following steps: by setting up an FBMC system model, and defining FBMC system parameters, analyzing the main factors of the equalization algorithm performance affecting the FBMC system; carrying out the improved sphere decoding algorithm; and carrying out simulation experiments for the algorithm and comparing; and analyzing simulation results. The improved sphere decoding algorithm means that the equalization of the FBMC system can be realized by lowering the complexity of the sphere decoding algorithm, and comprises the following steps: defining the equalization of the FBMC system; and realizing the equalization of the FBMC system by the method of probability estimate of d'2-LB (k-1) >= | | zk: M-Rk: M, K: Mbk: M | | 2 to lower the complexity of the sphere decoding algorithm. The invention utilizes the improved decoding algorithm to lower the bit error rate and the complexity of equalization algorithm of the FBMC system, and carries out verification by the simulation experiments, and the simulation results show that the improved decoding algorithm obviously lowers the complexity of the algorithm, has less loss of performance, has higher superiority and better meets the requirements of modern communications for real-time signal processing particularly when the signal to noise ratio is smaller, and has good prospects for development.

The invention relates to the field of communication and discloses a signal detection device and method. According to the signal detection device and method disclosed by the invention, as the in-phase branch demodulation output end of a Costas loop not only is coupled with a bit synchronization device but also needs to be coupled with a code phase tracking device, the change condition of the bit cycle of bi-phase mark data is detected in real time by utilizing the code phase tracking device, and when a code phase is deviated, error correction is performed on the code phase in time so as to ensure the decoding correctness of the bi-phase mark data. The problem that a radio data system/radio broadcast data system (RDS/RBDS) signal cannot be correctly decoded because the number of sampling points of the bi-phase mark data in a unit cycle is changed because of the factors such as the stability of a transmitter crystal oscillator, a Doppler effect and the drifting of a receiver crystal oscillator is effectively solved, and therefore, the RDS/RBDS data demodulation is at a correct bit boundary position all along.

The invention discloses a transmission method for antenna quantity which aims to solve the problem that the antenna quantity fails to be accurately obtained in the prior art. The method comprises that: a corresponding relation is established between the quantity of transmitting antennas and time-domain mapping sequences of the data on a physical channel, and is respectively saved on the sending end and the receiving end; the sending end adopts a corresponding time-domain mapping sequence to send data on the physical channel according to the quantity of the antennas; after the receiving end receives the data, a demapping, a decoding and a CRC check are made according to different quantities of the transmitting antennas and the corresponding relation between the quantity of the antennas and the time-domain mapping sequences which is stored in advance, the quantity of the transmitting antennas is confirmed according to the result of the CRC check. The method of the invention can well detect the quantity of the antennas, particularly can well distinguish two antennas and four antennas, thereby assuring the decoding performance of the data; and the method is simple and is easy to realize.

The invention discloses a sequencing statistical decoding method assisted by partial cyclic redundancy check (CRC). The method is suitable for soft decision decoding of low-density parity check (LDPC)codes with information bits meeting CRC. Before decoding, a system generation matrix is formed according to a generation polynomial of cyclic redundancy check, the matrix is divided into two parts, one part is used for detecting a decoding result, and the other part is used for assisting decoding. A part of the CRC generation matrix of auxiliary decoding is multiplied by the generation matrix ofthe low-density parity-check code to obtain a joint generation matrix. In the decoding process, an iterative sorting statistical decoding (BP-OSD) method is mainly adopted, and a matrix is generated jointly to serve as a coding matrix in an OSD algorithm. After decoding is completed, CRC check is conducted on the information bits of the code words, and if the CRC check is met, the code serves as decoding output; otherwise the code is decided as decoding failure. According to the method, the error correction performance of the LDPC code is greatly enhanced while the CRC error detection functionis reserved.

The invention discloses a method for transmitting the antenna information of a physical broadcast channel and is applied in a wireless communication system, and according to the transmission antenna number of the physical broadcast channel and which time the current sending belongs to in a period, a sending end selects a corresponding scrambling sequence for implementing the scrambling of original information bits, generates a cyclical redundancy check (CRC) code, and sends out the CRC code together with the data; wherein, two antennas and four antennas are corresponding to different scrambling sequences. The method of the invention can well detect the antenna information of the physical broadcast channel and is characterized in that the two situations with two antennas and four antennas are well differentiated, thus ensuring the decoding performance of other physical channels.

The embodiment of the invention discloses a Viterbi decoding method and a Viterbi decoder. The Viterbi decoding method comprises the following steps: receiving input two-path data; calculating the received two-path data according to a state transfer rule of a state transfer butterfly pair to obtain a branch metric value of each state; performing ACS (add-compare-select) processing in parallel on the path metric values of 16 states at the previous moment aiming at 8 state transfer butterfly pairs each time by use of the calculated branch metric value; storing the path metric value of each state obtained by the ACS processing as well as the state transfer relationship mark of the path metric value; comparing the stored path metric value of each state and searching for the greatest path metric value; and backtracking the greatest path metric value according to the stored state transfer relationship mark, and outputting the decoding result. According to the technical scheme provided by the embodiment of the invention, the decoding speed is effectively increased on the premise of ensuring the decoding effect of the Viterbi algorithm.

Embodiments of the invention provide an LDPC decoding method, an LDPC decoder, and a storage device thereof. The LDPC decoding method scales down first reliability information transmitted from the variable node to the check node, second reliability information transmitted from the check node to the variable node, and bit information of the variable node in at least one iterative cycle. The scaling operation can reduce the absolute value of the information, so that the decoder is allowed to use less bit width to achieve the goal of reducing the hardware cost of the decoder while ensuring the decoding performance.

The invention discloses a method for transmitting the antenna information of a physical broadcast channel, and a sending end arranges the original information bits in sequence according to the number of the sending antennas of the physical broadcast channel, generates cyclical redundancy check (CRC) bits according to the ordering result, and sends out the CRC bits together with the original information bits; wherein, the method adopts different ordering ways in the situations with two antennas or four antennas. The method of the invention can well detect the antenna information of the physical broadcast channel and is characterized in that the two situations with two antennas and four antennas are well differentiated, thus ensuring the decoding performance of other physical channels.

The invention provides a soft demodulation method and a soft demodulation system applicable to QAM (Quadrature Amplitude Modulation) of Gray mapping. The method comprises the steps of acquiring a correction factor corresponding to each bit in currently received symbols; and calculating an LLR (Log-Likelihood Ratio) value corresponding to each bit according to the currently received symbols and the correction factor corresponding to each bit, thereby carrying out soft demodulation on the currently received symbols. The correction factor indicates a constellation pattern required to be demodulated and the current noise variance, and approaches the slope of a first-order linear function of an LLR theoretical curve of the corresponding bit. The soft demodulation method and the soft demodulation system can be applied to QAM of the Gray mapping, particularly can be applied to soft demodulation for high-order QAM, and can maintain the accuracy of acquired LLR information while reducing the computational complexity.

The key ideal of the invention comprises: using the precious sync result obtained from downlink sync process to determine the time delay expansion of channel; based on the bandwidth preset by system, determining the time delay expansion threshold value; according to said time delay expansion value of channel and said time delay expansion threshold, determining the mode of allocating subcarrier; based on said subcarrier allocating mode, allocating the subcarrier to the terminal. The invention improves the performance of system demodulation and frequency spectrum.

The invention provides a video App decoding method and device, and belongs to the technical field of videos. The video App decoding method includes the steps: collecting video coding and decoding information required by video decoding; generating a decoding strategy according to the video coding and decoding information, wherein the decoding strategy includes each playing code rate supported by the current terminal and the mapping relationship of the decoding type corresponding to each playing code rate, wherein the decoding type is determined by hardware information; analyzing the decoding strategy to select one of the each playing code rate as a target playing code rate; and determining the decoding type corresponding to the target playing code rate according to the mapping relationshipso as to decode videos. The video App decoding method and device can select the decoding type according to the playing code rate, can provide an accurate and appropriate decoding strategy for the video App, can reduce the decoding difference of different terminals, and can improve the user experience of playing the video.

The invention discloses a method and a device for decoding uplink control channels in an LTE TDD system. The method comprises the following steps: carrying out trellis decoding of soft information received through a control channel to acquire a vector to be judged; according to a preconstructed characteristic vector matrix and the obtained vector to be judged, acquiring a fifth information bit value and a ninth information bit value, wherein characteristic vector groups consisting of characteristic vectors in the characteristic vector matrix respectively corresponding to each information bit in an information bit sequence; according to the acquired fifth information bit value and the ninth information bit value and characteristic vectors in the characteristic vector matrix corresponding to both bit values, carrying out interference removing of the vector to be judged to acquire a new vector to be judged; and according to the corresponding relation of the characteristic vector matrix and the new vector to be judged, acquiring other information bit values in the information bit sequence. Meanwhile, the invention also discloses a device for decoding uplink control channels in the LTE TDD system. The method and the device reduce decoding complexity of uplink control channels in the LTE TDD system, and ensure decoding performance.

The invention discloses a self-adaptive code length low-complexity BPL decoder, which comprises the following steps of: inputting a code length N, a list size L and a maximum number of iterations; selecting the number of permutation factor graphs according to the list size; decoding is carried out on each factor graph after replacement, and a decoding result is stored; a final decoding result is determined by searching the minimum Euclidean distance; according to the invention, a proper decoder structure can be selected according to the code length, and the decoding complexity is reduced to a great extent while the BP decoding performance is improved.

The embodiment of the invention discloses a decoding method and device, a terminal, a chip and a storage medium. The decoding method comprises the steps of receiving a to-be-decoded sequence; if the channel type corresponding to the to-be-decoded sequence is PDCCH, detecting the current working state; determining a decoding control strategy according to the channel type and the current working state; wherein the decoding control strategy comprises an illegal path discarding strategy and an illegal path reserving strategy; and decoding the to-be-decoded sequence according to the decoding control strategy.

The invention provides a method and terminal for adjusting HARQ buffer memory amounts, and relates to the technical field of communication. The method comprises the steps of reducing the rated HARQ buffer memory amounts of code blocks according to the rated proportions, then judging whether the HARQ buffer memory amounts after reduction are within a preset threshold range or not, if the HARQ buffer memory amounts after reduction are within the preset threshold range, only saving a part of encoding information, setting the rated proportions to guarantee that the encoding performance of the encoding information after reduction can not be greatly reduced, and then setting the threshold range to limit the condition for reducing the HARQ buffer memory amounts. By means of the technical scheme, under the condition that the encoding performance is ensured, the HARQ buffer memory amounts can be reduced in use. The method and terminal for adjusting the HARQ buffer memory amounts are mainly applied to the processes of turbo encoding and decoding and transmission of related information.

The invention relates to a method for using multi-antenna to receive and decode signal, and relative device. Wherein, it is characterized in that: iteratively decoding the receiving signal with disturb signal received by antenna; summing and averaging the likelihood ratio of treated information bit, to obtain the likelihood ratio of information bit; and in the iterative decoding process, it also combines the external information to obtain the prior information needed in next iterative decoding process. Therefore, the invention can fully use multi-sender antenna to improve the frequency spectrum utilization, to confirm the decoding property of MIMO system.

The invention provides a low-complexity polarization code SC decoding method based on aggregation construction, and particularly relates to a reliable node aggregation construction method and a reliable node multipath decoding method based on node reliability. The node aggregation construction method does not depend on log-likelihood ratio information obtained through calculation in the decoding process and can be completed before decoding execution. The defect that the position of the reliable node needs to be judged through comparison operation in the decoding process in the existing literature is overcome. The implementation complexity of the decoder is reduced, and a large number of comparison and judgment operations irrelevant to SC decoding are omitted. The decoding method accords with the regulation of the 3GPP TS38.212 protocol on the polarization coding of the control channel, and the channel coding processing is completed strictly according to the regulation of the protocol at the PDCCH transmitting end. The method is suitable for traditional polarization code construction, polarization code construction adopting CRC cascading and coding construction of various fixed frozen set sequences. And the method has good universality and practicability.

The invention provides a Turbo iterative decoding output control method and device, and decoding equipment. The method comprises the steps of: in the ith iterative decoding process, obtaining a firsthard decision result according to the first output information of a first component decoder; in the ith iterative decoding process, obtaining a second hard decision result according to the second output information of a second component decoder; when the fact that the first hard decision result and the second hard decision result are equal is determined, performing CRC check of the first hard decision result or the second hard decision result; and, when the fact that the first hard decision result or the second hard decision result satisfies CRC check is determined, taking the checked first hard decision result or the checked second hard decision result as the decoding result, and outputting the decoding result. The possibility that iteration is stopped too early when the decoding result is converged can be reduced; on the premise that the decoding performance is ensured, the decoding delay of a Turbo code is shortened; and thus, the decoding efficiency is increased.