摘要:
本发明公开了一种LDPC码的基矩阵生成方法、编译码方法及设备,涉及通信领域,解决了由于打孔图样差使得变形后的校验矩阵的性能得不到保证,导致的译码出错的概率增加的问题。具体方案为:根据所需的最低码率确定基矩阵的校验位部分的大小,根据初始矩阵及校验位部分的大小确定基矩阵的校验位部分,初始矩阵为具备双对角结构的、大小为m×m的矩阵,校验位部分为对初始矩阵进行k次变换处理后得到的k阶变换矩阵H k ,k满足2 k-1 m<T≤2 k m,T为所述校验位部分的大小,根据校验位部分确定基矩阵的信息位部分,根据校验位部分和信息位部分得到基矩阵。本发明用于编译码过程中。
摘要:
Technologies for correcting flipped bits prior to performing an error correction decode process include an apparatus that includes a memory to store a redundant set of codewords and a controller to read data from the memory. The controller selects a codword from the redundant set of codewords to read from the memory, analyzes the selected codewords to determine whether the codeword contains uncorrectable errors, reads remaining codewords in the redundant set that correspond to the selected codeword, combines the remaining codewords together to generate a rebuilt codeword, flips bits in sections of the rebuilt codeword that differ from the selected codeword by a threshold amount, and performs an error correction decode process based on the rebuilt codeword.
摘要:
Approaches are provided for closing communications channel links (e.g., for small terminal applications in satellite communications systems), at lower effective data rates, in a most power efficient manner, while still meeting regulatory requirements. Such approaches employ modulation and coding schemes that facilitate such lower effective data rates in a most power efficient manner. The new modulation and coding schemes include new low density parity check (LDPC) codes.
摘要:
An error correcting encoder comprises an error correcting data generator for receiving payload data belonging to a first category (first category payload data), for receiving payload data belonging to a second category, for determining first error correcting data for the first category payload data, and for determining second error correcting data for the second category payload data. The error correcting encoder further comprises an interleaver for interleaving at least the second error correcting data and the second category payload data with each other. A first interleaving length relative to an interleaving of the first error correcting data and the first category payload data is different from a second interleaving length relative to the interleaving of the second error correcting data and the second category payload data. A corresponding error correcting decoder and methods for error correcting encoding/decoding are also disclosed. According to alternative embodiments, a payload interleaving length is different from an error correcting data interleaving length.
摘要:
A method is provided for channel encoding in a communication system using a Low-Density Parity Check (LDPC) code. The method includes grouping information bits into a plurality of groups; determining an order of the plurality of groups to be shortened, based on a ratio of a number of bits to be shortened to a number of bits to be punctured; determining a length of an information word to be obtained by shortening the plurality of groups; shortening the plurality of groups on a group basis in the determined order based on the determined length of the information word; and LDPC-encoding a shortened information word.
摘要:
The present invention relates to a method of transmitting and a method of receiving signals and corresponding apparatus. One aspect of the present invention relates to an efficient L1 signaling method for an efficient transmitter and an efficient receiver using the efficient L1 signaling method for an efficient cable broadcasting.
摘要:
Methods and apparatus are provided for improved physical re-read operations in a hard disk drive. The disclosed methods and apparatus selectively retain data in a hard disk drive, A signal is read in an iterative read channel by assigning a reliability metric to each of a plurality of segments in a read signal; repeating the assigning step for a plurality of read operations; and selectively retaining the segments based on the assigned reliability metric. The read signal can be obtained by positioning a transducer over a storage media. The reliability metric may be based on soft bit decisions; log likelihood ratios or a noise estimation of a given segment.
摘要:
A decoder architecture and method for implementing a decoder are provided. In one implementation, the decoder architecture includes an input buffer (202) configured to receive a plurality of codewords to be processed, and includes an iterative decoder (204) configured to receive a first codeword from the input buffer and process the first codeword. The iterative decoder processes the first codeword only for an amount of time required for the first codeword to become substantially error free. The decoder architecture further includes logic coupled to each of the iterative decoder and the input buffer. The logic (206) is configured to determine when the first codeword processed by the decoder becomes substantially error free. The logic further generates a signal for loading a second codeword from the input buffer into the iterative decoder responsive to the logic determining when the first codeword becomes substantially error free.