Patent ID: 8514971

Claim:
A base station apparatus used in a mobile communication system where user terminals with various numbers of reception antennas may be situated, comprising: a providing unit configured to provide plural reference signals according to the number of transmission antennas; an adaptive precoding unit configured to replicate each of input signal sequences corresponding to the number of transmission streams, apply an adaptive precoding vector to each of the replicated sequences, and generate output signal sequences corresponding to the number of transmission antennas; a precoding unit configured to: replicate, according to the number of transmission antennas, each of a predetermined number of second input signal sequences, wherein at least one of the second input signal sequences includes a control signal, one of the plurality of reference signals, and one of the first output signal sequences, apply a predetermined precoding vector to each of the replicated second input signal sequences, and generate second output signal sequences corresponding to the number of transmission antennas; and a transmitting unit configured to transmit transmission signals including the second output signal sequences from plural of the transmission antennas.