Patent ID: 8730876

Claim:
A reception apparatus comprising: a receiver configured to receive a first stream and a second stream that are transmitted from a transmission apparatus and that are spatial-multiplexed, wherein, the first stream is generated using a first sequence, a first ACK/NACK signal vector and a second ACK/NACK signal vector different from the first ACK/NACK signal vector, and the second stream is generated using a second sequence different from the first sequence, the first ACK/NACK signal vector and the second ACK/NACK signal vector, each of the first ACK/NACK signal vector and the second ACK/NACK signal vector being formed based on a signal indicative of ACK/NACK; and a detector configured to detect said signal indicative of ACK/NACK based on the first ACK/NACK signal vector and the second ACK/NACK signal vector.