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1. (WO2018202143) IMPROVED QC-LDPC CODES

Pub. No.:    WO/2018/202143    International Application No.:    PCT/CN2018/085648
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Sat May 05 01:59:59 CEST 2018
IPC: H03M 13/11
Applicants: MEDIATEK INC.
Inventors: HSU, Cheng-Yi
LEE, Chong-You
CHEN, Wei-Jen
CHIU, Mao-Ching
FISHER-JEFFES, Timothy Perrin
CHEN, Ju-Ya
CHANG, Yen-Shuo
Title: IMPROVED QC-LDPC CODES
Abstract:
An apparatus determines a code block size (CBS) of information bits contained in a codeword of low-density parity check (LDPC) coding. The apparatus compares the CBS with at least one threshold, determines, based on a result of the comparison, a Kb number and determines a Kp number based on a code rate and the Kb number. The apparatus generates a parity check matrix. An information portion of the parity check matrix is a first matrix formed by M number of second square matrices. M is equal to Kp multiplied by Kb. A total number of columns in the Kb number of second square matrices is equal to a total number of bits of the CBS. One or more matrices of the M number of second square matrices are circular permutation matrices. The apparatus operates an LDPC encoder or an LDPC decoder based on the parity check matrix.