ENCODER, DECODER, ENCODING METHOD AND DECODING METHOD

The present invention discloses an encoder, a decoder, an encoding method and a decoding method based on Low-density parity-check (LDPC) code. The encoding method comprises: receiving, by an encoder, an information for encoding; generating, by the encoder, a first portion codeword according to a first encoding rule and the information for encoding, wherein the first encoding rule is an encoding rule configured to generate LDPC code; generating, by the encoder, a second portion codeword according to a second encoding rule different from the first encoding rule and a double check region of the first portion codeword; and concatenating, by the encoder, the first portion codeword and the second portion codeword to generate a codeword. A plurality of trapping sets corresponding to the first encoding rule include at least one error bit within the double check region. 本发明公开了一种基于低密度奇偶校验码的编码器、译码器、编码方法及译码方法。编码方法包括：通过一编码器接收一待编码信息；通过编码器依据一第一编码规则及待编码信息产生一第一部分码字，其中第一编码规则为用以产生低密度奇偶校验码的一编码规则；通过编码器依据不同于第一编码规则的一第二编码规则及第一部分码字中的