Patent ID: 7254769
Filing Date: 2007-08-07
Classification: H03M,H04L

Abstract:
1. An encoding apparatus for encoding input information data using LDPC (low density parity check) codes and transmitting encoded data to a decoding apparatus in a hybrid automatic repeat request system, the encoding apparatus comprising: a first LDPC code encoder for performing LDPC code encoding on the input information data and transmitting the encoded data to the decoding apparatus; an interleaver for interleaving the input information data; and a second LDPC code encoder arranged in parallel with the first LDPC code encoder, for performing LDPC code encoding on an output of the interleaver, wherein the first LDPC code encoder transmits an output signal to the decoding apparatus at odd numbered retransmissions in response to a retransmission request from the decoding apparatus, and the second LDPC code encoder transmits an output signal to the decoding apparatus at even numbered retransmissions in response to the retransmission request from the decoding apparatus.