Encoder and encoding method for Quasic-low-density parity-check (QC-LDPC) codes in digital television terrestrial multimedia broadcasting (DTMB) system
An encoder and coding technology, applied in error detection coding, transmission system, digital transmission system using multi-bit parity bits, etc., can solve the problems of transmission signal interference, digital signal error, etc.
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0026] QC-LDPC code is a special kind of LDPC code. Its generator matrix G and check matrix H are both arrays composed of cyclic matrices, which have the characteristics of segmented cyclic, so they are called quasi-cyclic LDPC codes. From the point of view of rows, each row of the circulatory matrix is the result of a cyclic right shift of the previous row (the first row is the last row); from the perspective of columns, each column of the circulatory matrix is the previous column (the first row is the last row). column) the result of circularly shifting down one bit. The set of row vectors of a circulant matrix is exactly the same as the set of column vectors. Therefore, a circulant matrix can be completely characterized by its first row (or first column). The row and column weights of ...
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