METHOD AND DEVICE FOR ENCODING OR DECODING VARIABLE CODE LENGTH LDPC CODES AND ENCODER AND DECODER

摘要

A method for encoding or decoding an LDPC code with variable code lengths is provided in an embodiment of the present invention. The method includes: obtaining a base exponential matrix of an LDPC code and grouping code lengths during construction of the base exponential matrix; correcting the base exponential matrix according to a grouping correction factor to obtain an exponential matrix of the group corresponding to the grouping correction factor; extending the exponential matrix by using an extension factor of a code length in the group to obtain an LDPC matrix corresponding to the code length; and implementing encoding or decoding by using the LDPC matrix. The method for encoding or decoding an LDPC code with variable code lengths provided in an embodiment of the present invention can be used to ensure that no small cycles occur at each required code length of the LDPC code obtained through multiple constructions. Thus, the performance can be greatly improved. In addition, a device for encoding or decoding, an encoder, and a decoder are provided in embodiments of the present invention.