Method and apparatus of communication using soft decision

An apparatus for communication using soft decision in a wireless access system, the apparatus comprising:

• one or more antennas:
• a demodulator;
• and
• a network coding decoder,
• wherein the one or more antennas are configured to receive first code blocks from a transmitter,
• wherein the demodulator is configured to arrange the received first code blocks in descending order of their soft decision levels,
• wherein the apparatus transmits by using the one or more antennas a retransmission request message requesting a retransmission of at least one of the first code blocks having a soft decision level lower than a predetermined soft decision level,
• wherein the one or more antennas are configured to receive at least one of second code blocks retransmitted in response to the retransmission request message,
• wherein the demodulator is configured to rearrange the first code blocks and the retransmitted second code blocks in descending order of their soft decision levels,
• wherein the network coding decoder is configured to perform a first random linear decoding on a first code block set, wherein the first code block set is constructed of the rearranged first code blocks and the rearranged second code blocks arranged in descending order of their soft decision levels, and
• wherein the first code blocks and the second code blocks are random-linear-coded.