Radio communication device and constellation control method

摘要

A base station is provided for receiving an acknowledgement or negative acknowledgement (ACK/NACK) signal, including a transmitting unit configured to transmit a control signal using one or a plurality of CCE(s). The base station also includes a receiving unit configured to receive an ACK/NACK signal, the ACK/NACK signal being multiplied by an orthogonal sequence, by a sequence defined by a cyclic shift, and by either a first value or a second value, wherein the first value rotates a constellation of the ACK/NACK signal by 0 degrees and the second value rotates the constellation of the ACK/NACK signal by N degrees, which is different from 0 degrees.

主权项

1. A radio communication apparatus comprising an integrated circuit configured:
to spread transmission signals using a plurality of sequences that can be separated from each other because of different cyclic shift values; to use received power at a receiver as a basis for allocating transmission signals to a first signal group or to a second signal group, the first signal group comprising at least a transmission signal which is spread using a first sequence of the plurality of sequences and the second signal group comprising transmission signals which are spread using other sequences of the plurality of sequences, the first signal group and the second signal group having different received power at the receiver; and to invert a constellation of the second signal group with respect to a constellation of the first signal group for transmission to the receiver.