Patent ID: 8261150

Claim:
A multi-antenna transmission apparatus comprising: a Low Density Parity Check (LDPC) encoding section that encodes different units of transmission data using an LDPC code to generate first units of LDPC encoded data, each of the first units of LDPC encoded data being assigned to a respective antenna of a plurality of antennas; a transmission section that transmits the first units of LDPC encoded data assigned to the plurality of antennas; a storage section that stores for retransmission the first units of LDPC encoded data assigned to the plurality of antennas upon a first transmission; and a transmission control section that controls transmission so that, upon a retransmission, only second units of LDPC encoded data are transmitted, the second units of LDPC encoded data including a part of the first units of LDPC encoded data stored in the storage section and having a transmission error, the second units of LDPC encoded data being assigned to at least one antenna of the plurality of antennas, wherein: the second units of LDPC encoded data are K-bit data obtained using top K column vectors of a check matrix H of the LDPC code, wherein the top K column vectors include the most “1”s out of n column vectors of the check matrix H, K is the number of bits in the second units of LDPC encoded data and 1<K<n, and n is the number of column vectors of the check matrix H.